JP6000753B2 - Piston holding mechanism and chemical injection device provided with the same - Google Patents

Description

The present invention is a mechanism for holding the various parts of the syringe when pushing the piston of the syringe into the cylinder, in particular, it relates to a piston retaining Organization for holding the piston flange formed at the rear end of the piston. The present invention relates to a liquid injector comprising a cylinder holding mechanism for holding the outer peripheral surface of the piston holding mechanism and the cylinder.

  Examples of medical diagnostic imaging apparatuses include a CT apparatus, an MRI apparatus, a PET apparatus, an angio apparatus, and an MRA apparatus. When these devices are used, a chemical solution such as a contrast medium or physiological saline is often injected into the subject.

  Usually, the drug solution is filled in a syringe. The syringe has a cylinder that stores a chemical solution and a piston that is inserted into the cylinder so as to be movable back and forth. An injection needle or catheter is connected to the tip of the cylinder via an extension tube, and the injection needle or catheter is punctured into the blood vessel of the subject, and the piston is advanced in that state to inject the drug solution in the syringe into the subject. can do.

  The amount of the chemical solution to be injected into the subject varies greatly depending on the purpose of diagnosis, etc. Therefore, there are various sizes of syringes according to the injection amount of the chemical solution. Conventionally, in order to be able to mount such various sizes of syringes on a single chemical injection device, in Patent Document 1, an adapter is prepared for each syringe size, and the syringe is injected with the chemical via the adapter. It is described to be attached to the device.

International Publication No. 2005/002650

  However, unlike syringes, adapters can be used repeatedly and are usually stored for subsequent use after use. Therefore, when the types of syringes increase, the types of adapters increase accordingly, and the management of the adapters becomes complicated. Moreover, when the kind of adapter increases, the problem of misuse of an adapter which will use the adapter which is not suitable for the syringe made into holding | maintenance use may also arise. If the wrong adapter is used, the syringe may not be properly held. In particular, prefilled syringes for MR have many types, and therefore many types of adapters. Therefore, the management of the adapter and the misuse of the adapter are likely to occur.

The present invention is capable of holding various sizes of syringes without using an adapter, a piston holding mechanism, and an object thereof is to provide a liquid injector having a contact and a piston holding mechanism.

The piston holding mechanism of the present invention is a piston holding mechanism for holding a piston flange formed at the rear end of the piston in order to push the piston of the syringe into the cylinder,
Frame,
A pair of flange holding members supported by the frame so as to hold the piston flange from both diametrical sides;
An actuating member for actuating a pair of flange holding members;
Have
In order to hold the piston flanges of syringes of different sizes at least with different piston flange sizes,
The flange holding member is supported by the frame so as to swing in a front-back direction in the front-rear direction, holds the piston flange of the largest syringe at the position of the rearmost end of the swing range, and In order to hold the piston flange of the syringe of the minimum size, it has a plurality of flange receivers formed in a stepped manner in order from the maximum size to the minimum size among the plurality of sizes,
The operating member is movably supported by the frame so as to swing the pair of flange holding members in the front-rear direction.

Furthermore, the present invention provides a chemical liquid injector. The chemical injection device of the present invention is a chemical injection device that separately holds a cylinder and a piston of a syringe filled with a chemical, and injects the chemical by pushing the piston into the cylinder,
The piston holding mechanism of the present invention;
A cylinder holding mechanism for holding the cylinder;
A drive mechanism that advances the piston holding mechanism toward the cylinder holding mechanism or reverses it in the reverse direction;
A control unit for controlling the operation of the drive mechanism;
Have

  According to the present invention, it is possible to hold a plurality of types of syringes having different sizes without using an adapter. As a result, management of the adapter becomes unnecessary, and problems such as misuse of the adapter do not occur.

It is a top view of the chemical injection device by one embodiment of the present invention. It is a top view of an example of the syringe which can be mounted | worn with the chemical | medical solution injection apparatus shown in FIG. It is a perspective view of the piston holding mechanism shown in FIG. FIG. 4 is an exploded perspective view of the piston holding mechanism shown in FIG. 3. It is a top view of the piston holding mechanism shown in FIG. 1, and shows a state where the flange holding member is at the most advanced position. FIG. 5 is a plan view of the piston holding mechanism shown in FIG. 1, showing a state where the flange holding member is retracted by one step from the state shown in FIG. 5A. FIG. 5 is a plan view of the piston holding mechanism shown in FIG. 1, showing a state where the flange holding member is further retracted by one step from the state shown in FIG. 5B. FIG. 5 is a plan view of the piston holding mechanism shown in FIG. 1, showing a state where the flange holding member is further retracted by one step from the state shown in FIG. 5C. FIG. 2 is a plan view of the piston holding mechanism shown in FIG. 1, showing a state where the flange holding member is in the most retracted position. It is a perspective view of the cylinder holding mechanism shown in FIG. It is a front view which shows the state where the space | interval of a pair of cylinder presser of the cylinder holding mechanism shown in FIG. 1 became the narrowest. It is a front view which shows the state which the space | interval of a pair of cylinder presser of the cylinder holding mechanism shown in FIG. 1 expanded most. It is sectional drawing of an example of the flange holding | maintenance mechanism which can be considered when trying to hold | maintain the piston flange of several sizes, without using an adapter. It is a perspective view which shows the state of a pair of cylinder presser of the other form of the cylinder holding mechanism by this invention closed. It is a disassembled perspective view of the cylinder holding mechanism shown in FIG. It is a perspective view which shows the state of a pair of cylinder presser of the cylinder holding mechanism shown in FIG. It is a perspective view which shows the state which a pair of cylinder presser of the further another form of the cylinder holding mechanism by this invention closed. FIG. 14 is a perspective view of the cylinder holding mechanism shown in FIG. 13 as viewed from below with the base removed. It is a top view of an example of the chemical | medical solution injection | pouring apparatus which has arrange | positioned LED so that it can recognize visually whether the flange holding member of a piston holding mechanism is an appropriate rocking | fluctuation angle. It is a block diagram of the chemical injection device by other forms of the present invention.

  Embodiments of the present invention will be described below. In the present invention, the front-rear direction is defined as “front” as the direction in which the piston is pushed into the cylinder in the state where the chemical liquid injector holds the syringe, and “rear” as the opposite direction.

[Medical solution injection device]
Referring to FIG. 1, there is shown a chemical liquid injector 100 according to an embodiment of the present invention having a piston holding mechanism 10 and a cylinder holding mechanism 30. This medicinal solution injection device 100 can mount a plurality of types of syringes 110 having different sizes without using an adapter, and can inject a medicinal solution filled in the syringe 110 into a subject.

  An example of a syringe 110 that can be attached to the chemical liquid injector 100 is shown in FIG. The syringe 110 includes a cylinder 111 that holds a chemical solution and a piston 114 that is slidably inserted into the cylinder 111. The cylinder 111 has a conduit 112 at the front end and a cylinder flange 113 at the rear end, and the piston 114 is inserted into the cylinder 111 from the rear end of the cylinder 111. A disc-shaped piston flange 115 is formed at the rear end of the piston 114.

  By applying a force to the rear end surface of the piston flange 115 and moving the piston 114 forward relative to the cylinder 111 so that the piston 114 is pushed into the cylinder 111, the chemical solution in the cylinder 111 can be pushed out through the conduit 112. For example, an extension tube (not shown) with an injection needle connected to the tip is connected to the conduit 112, and the piston 114 is pushed into the cylinder 111 in a state where the injection needle is punctured into the blood vessel of the subject, thereby supplying the drug solution to the subject. Can be injected.

  In many cases, the amount of medicinal solution injected varies depending on the type of medicinal solution to be injected and the weight of the subject. Accordingly, there are a plurality of types of syringes 110 having different volumes so that various injection amounts can be accommodated. A plurality of types of syringes 110 having different capacities usually differ in the diameter of the cylinder 111, the length of the cylinder 111, and the thickness of the piston 114. Further, due to the difference in these dimensions, from the viewpoint of good operability of the syringe 110, the size of the cylinder flange 11, the diameter D of the piston flange 115, and when the piston 114 is most inserted into the cylinder 111. The distance L from the rear surface of the piston flange 115 to the front surface of the cylinder flange 113 in the axial direction of the syringe 110 (this distance L is also referred to as “inter-flange distance L” for the sake of simplicity) is different. The smaller the volume of the chemical solution that can be filled in the syringe 110, the smaller the dimensions of these parts.

  In the present invention, any kind of syringe 110 can be used. The types of syringes 110 that can be used are classified according to the filling form of the chemical solution, and prefilled syringes that are pre-filled with the chemical solution, and post-filled syringes that are filled with the chemical solution prior to injection at the medical site (shipment from the manufacturer) In some cases, it is also referred to as “empty syringe” in the sense that it is not filled with a chemical solution. In addition, MR syringes, CT syringes, angio syringes, and the like are classified according to use.

  Referring to FIG. 1 again, the cylinder holding mechanism 30 holds the rear end portion of the cylinder 111 so that the cylinder 111 does not move in the movement direction of the piston 114, that is, in the front-rear direction. The piston holding mechanism 10 is configured to hold the piston flange 115 by supporting at least the rear end surface of the piston flange 115 of the syringe 110 in which the cylinder 111 is held by the cylinder holding mechanism 30. The piston holding mechanism 10 is supported by a main shaft 50 disposed in parallel with the central axis of the syringe 110 held by the cylinder holding mechanism 30.

  The main shaft 50 is supported so as to be movable in the axial direction thereof, and the piston holding mechanism 10 can be moved forward and backward by the movement of the main shaft 50.

  For the operation of the main shaft 50, the chemical liquid injector 100 further includes a screw shaft 51 and a connection mechanism 52. The screw shaft 51 is disposed in parallel with the main shaft 50 and is rotated by using a motor (not shown) as a drive source. If necessary, an appropriate speed reduction mechanism in which a plurality of gears are combined may be provided between the motor and the screw shaft 51. The coupling mechanism 52 has a structure that meshes with the screw shaft 51 and is fixed to the main shaft 50. The main shaft 50, the screw shaft 51, the coupling mechanism 52, and the motor constitute a drive mechanism that moves the piston holding mechanism 10 forward toward the cylinder holding mechanism 30 or moves it backward in the present invention.

  Since the coupling mechanism 52 is fixed to the main shaft 50, the coupling mechanism 52 does not rotate even if the screw shaft 51 rotates. Therefore, the coupling mechanism 52 follows the screw shaft 52 according to the rotation direction of the screw shaft 51. The piston holding mechanism 10 can be moved in the front-rear direction by the movement. Further, if the coupling mechanism 52 is configured to be detachable with respect to the screw shaft 51, the piston holding mechanism is switched by switching the engagement and disengagement of the coupling mechanism 52 to the screw shaft 51 while the screw shaft 51 is rotated. It is also possible to switch between 10 moves and stops.

  As described above, with the cylinder holding mechanism 30 and the piston holding mechanism 10 separately holding the cylinder 111 and the piston 114 of the syringe 110, the piston holding mechanism 10 is advanced from the rear end side to the front end side of the syringe 110. By doing so, the piston 114 can be advanced with respect to the cylinder 111, and the chemical solution in the cylinder 111 can be discharged.

  Here, the piston holding mechanism 10 and the cylinder holding mechanism 30 are configured to be compatible with a plurality of types of syringes 110 having different sizes. Hereinafter, these will be described in detail.

[Piston holding mechanism]
FIG. 3 shows an embodiment of the piston holding mechanism 10, and FIG. 4 shows an exploded perspective view thereof. The illustrated piston holding mechanism 10 includes a pair of flange holding members 12 and 13 arranged side by side, a frame 11 that supports the flange holding members 12 and 13 so as to swing in a front-back direction, and a flange holding member. And an actuating member 14 for swinging the front and rear portions 12 and 13 in the front-rear direction.

  The frame 11 is fixed to the main shaft 50, and the piston holding mechanism 10 can be moved in the front-rear direction by moving the main shaft 50 in the front-rear direction. The flange holding members 12 and 13 hold the piston flange 115 (see FIG. 2) of the syringe 110 from both diametrical sides. The operating member 14 is supported by the frame 11 so as to be movable in the front-rear direction, and the pair of flange holding members 12, 13 and the pair of flange holding members 12, 13 and so that the pair of flange holding members 12, 13 swing in synchronization with the movement of the operating member 14. The actuating member 14 is connected. The connecting structure of the flange holding members 12 and 13 and the operating member 14 is arbitrary. For example, as shown in the form shown in the figure, the flange holding members 12 and 13 have protrusions (not shown), and the operating member 14 includes Two elongated holes 14a are formed at positions corresponding to the protrusions of the flange holding members 12 and 13, and the protrusions of the flange holding members 12 and 13 are freely inserted into the elongated holes 14a. Both can be connected so that the flange holding members 12 and 13 swing with the movement.

  The flange holding member 12 includes a plurality of flange receivers 12a and 12b that receive the outer peripheral portion of the piston flange 115 on the side facing the rear surface of the piston flange 115 of the syringe 110 held by the cylinder holding mechanism 30 (see FIG. 1). 12c, 12d, and 12e are formed. Similarly, flange receivers 13a, 13b, 13c, 13d, and 13e are formed on the other flange holding member 13 as well. Both the flange holding members 12 and 13 are configured to be symmetrical to each other including the flange receivers 12a to 12e and 13a to 13e, and the piston flange 115 is located at the opposite side of the center of the piston flange 115. Hold the outer periphery.

  Each of the flange receivers 12a to 12e and 13a to 13e has a bottom surface and a side surface that rises with respect to the bottom surface, and corresponds to the size of the syringe 110 to which the chemical liquid injector of this embodiment can be attached. It is formed stepwise in order until it is for size. That is, the chemical liquid injector (see FIG. 1) of this embodiment can be equipped with five types of sizes of syringes 110.

  The first-stage flange receivers 12a and 13a formed at positions farthest from the swing center of the flange holding members 12 and 13 correspond to the syringe 110 having the smallest size, and as shown in FIG. When 13 is at the foremost position of the swing range, the piston flange 115 of the smallest size syringe 110 can be received. More specifically, the flange receivers 12a and 13a are formed so that the bottom surface is parallel to a plane perpendicular to the moving direction of the piston holding mechanism 10 when the flange holding members 12 and 13 are in the foremost position. The distance between the side surfaces of the flange receivers 12a and 13a is defined so that only the piston flange 115 of the syringe 110 having the smallest size can be received on the side surfaces of the flange receivers 12a and 13a.

  The second-stage flange receivers 12b and 13b formed on the outer sides of the first-stage flange receivers 12a and 13a correspond to the syringe 110 having the second smallest size, and as shown in FIG. 13 is configured to receive the piston flange 115 of the second smallest size syringe 110 when it is in the second stage position, which is a position retracted by a predetermined angle from the position shown in FIG. 5A. Yes. More specifically, the second-stage flange receivers 12b and 13b have bottom surfaces parallel to a plane perpendicular to the moving direction of the piston holding mechanism 10 when the flange holding members 12 and 13 are in the second-stage position. In addition, the side surfaces of the flange receivers 12b and 13b can accept the piston flange 115 of the second smallest size syringe 110, but can accept the piston flange 115 of the larger size syringe 110. The distance between the side surfaces of both flange receivers 12b and 13b is defined so that it cannot be performed.

  The third-stage flange receivers 12c and 13c correspond to the syringe 110 having the third smallest size, and as shown in FIG. 5C, the flange holding members 12 and 13 recede by a predetermined angle further than the position shown in FIG. 5B. The piston flange 115 of the third smallest syringe 110 can be received when the third position is the third position. More specifically, the third-stage flange receivers 12c and 13c have a bottom surface parallel to a plane perpendicular to the moving direction of the piston holding mechanism 10 when the flange holding members 12 and 13 are in the third-stage position. Also, the side surfaces of the flange receivers 12c and 13c can accept the piston flange 115 of the syringe 110 having the third smallest size, but can accept the piston flange 115 of the larger size syringe 110. The distance between the side surfaces of both flange receivers 12c and 13c is defined so as not to be able to.

  The fourth-stage flange receivers 12d and 13d correspond to the fourth smallest size of the syringe 110, and as shown in FIG. 5D, the flange holding members 12 and 13 recede by a predetermined angle further than the position shown in FIG. 5C. The piston flange 115 of the syringe 110 having the fourth smallest size can be received when it is at the fourth position. More specifically, the fourth stage flange receivers 12d and 13d have bottom surfaces parallel to a plane perpendicular to the moving direction of the piston holding mechanism 10 when the flange holding members 12 and 13 are in the fourth stage position. In addition, the side surfaces of the flange receivers 12d and 13d can accept the piston flange 115 of the syringe 110 having the fourth smallest size, but can accept the piston flange 115 of the larger size syringe 110. The distance between the side surfaces of both flange receivers 12d and 13d is defined so as not to be able to.

  The fifth stage flange receivers 12e and 13e formed at positions closest to the center of swinging of the flange holding members 12 and 13 correspond to the syringe 110 of the maximum size, and as shown in FIG. It is configured to be able to receive the piston flange 115 of the syringe 110 of the maximum size when 13 is at the fifth stage position, which is a position further retracted by a predetermined angle than the position shown in FIG. 5D. More specifically, the fifth stage flange receivers 12e and 13e have bottom surfaces parallel to a plane perpendicular to the moving direction of the piston holding mechanism 10 when the flange holding members 12 and 13 are in the fifth stage position. In addition, the distance between the side surfaces of the flange receivers 12e and 13e is defined so that the side surfaces of the flange receivers 12e and 13e can receive the piston flange 115 of the maximum size syringe 110.

  The bottom surfaces of the flange receivers 12 a to 12 e and 13 a to 13 e are portions that press the piston flange 115 from the rear surface when the piston holding mechanism 10 is advanced to push the piston 114 into the cylinder 111. Therefore, as described above, when the flange holding members 12 and 13 are swung at a predetermined angle to receive the piston flange 115 of the syringe 110 of any size that can be held, the moving direction of the piston holding mechanism 10 By forming the bottom surfaces of the flange receivers 12a to 12e and 13a to 13e so as to be parallel to the plane perpendicular to the flange receivers 12a to 12e and 13a to 13e, the piston flange 115 can be pressed by surface contact. As a result, the piston holding mechanism 10 can push the piston 114 into the cylinder 111 more stably.

  As described above, a plurality of flange receivers 12a to 12e and 13a to 13e are provided in a stepped manner on the pair of flange holding members 12 and 13, respectively, and predetermined flange receivers 12a to 12e and 13a according to the size of the syringe 110 to be held. By having 13e hold the piston flange 115, the piston flange 115 of a plurality of types of syringes 110 having different sizes can be held without using an adapter.

  Usually, when it is going to hold | maintain the piston flange of several types of syringes from which a size differs, without using an adapter, the flange holding mechanism 1000 as shown, for example in FIG. 9 can be considered. In the flange holding mechanism 1000 shown in FIG. 9, a recess 1001 for receiving a piston flange is formed so that its diameter gradually decreases in the depth direction. The diameter of each step of the recess 1001 corresponds to the diameter of the piston flange of the syringe that can be held by the flange holding mechanism 1000, and the piston flange of the largest size syringe is held at the shallowest step of the recess 1001, The piston flange of the smallest size syringe is held at the deepest position of the recess 1001.

  As described above, the small-sized syringe also has a small flange distance L (see FIG. 2), and in order to discharge all of the filled chemical solution, the flange holding mechanism 1000 is further provided than the large-sized syringe. Need to move forward. However, in the flange holding mechanism 1000 shown in FIG. 9, the portion that holds the piston flange of the syringe of the smallest size is at the deepest position of the recess 1001, so that the flange mechanism 1000 is most advanced depending on the depth of the recess 1001. However, there are cases where the piston cannot be pushed all the way into the cylinder. This means that the required amount of drug solution may not be injected into the subject.

  Therefore, in the present invention, a pair of flange holding members 12 and 13 that swings in the front-rear direction are used, and the flange holding members 12 and 13 are pistons of the syringe 110 having the maximum size at the position of the rearmost end in the swinging direction. A plurality of flange receivers 12a to 12e and 13a to 13e are sequentially provided from the maximum size to the minimum size so as to hold the flange 115 and hold the piston flange 115 of the syringe 110 of the minimum size at the position of the foremost end in the swing direction. Has a configuration formed in a stepped shape.

  By doing so, the holding position of the piston flange 115 of the small-sized syringe 110 can be brought closer to the cylinder holding mechanism 30 (see FIG. 1) than the holding position of the piston flange 115 of the larger-sized syringe 110. . As a result, even with a small-sized syringe 110, the piston flange 115 can be held so that the piston 114 is pushed to the end. For all sizes of syringes 110 that can be held, in order to ensure that the piston 114 is pushed all the way in, the flange holders 12, 13 are required for the flange receivers 12 a-12 e, 13 a-13 e to receive the piston flange 115. From a syringe holding position reference surface S0 (see FIG. 1), which will be described later, to a bottom surface of each of the flange receivers 12a to 12e and 13a to 13e in a state where the predetermined swing angle is taken and the piston holding mechanism 10 is most advanced. Are preferably equal to or less than the distance L between the flanges of the corresponding syringes 110.

  In the pair of flange holding members 12 and 13, the distance between the side surfaces of one flange receiver 12 a to 12 e and the other flange receiver 13 a to 13 e corresponding thereto is a dimension that can receive the piston flange 115 of the corresponding syringe 110. If the flange receivers 12a to 12e and 13a to 13e hold the piston flange 115, the side surfaces of the flange receivers 12a to 12e and 13a to 13e come into contact with the side surface of the piston flange 115. It is preferable to be formed.

  By doing so, when the piston holding mechanism 10 is advanced and the piston 114 is pushed into the cylinder 111, the displacement of the piston flange 115 in the radial direction is suppressed by the side surfaces of the flange receivers 12a to 12e and 13a to 13e. The piston 114 can be pushed straight into the cylinder 111.

  Further, while the piston 114 is pushed into the cylinder 111, a force in a direction of swinging backward acts on the flange holding members 12 and 13. However, since the side surfaces of the flange receivers 12a to 12e and 13a to 13e are in contact with the side surfaces of the piston flange 115, the rearward swing of the flange holding members 12 and 13 is suppressed. Can be held more firmly.

  In order to exhibit the effects of the flange receivers 12a to 12e and 13a to 13e more effectively, the flange receivers 12a to 12e and 13a to 13e have side surfaces formed in an arc shape as shown in FIG. Preferably it is. By making the side surfaces of the flange receivers 12a to 12e and 13a to 13e arcs, the side surfaces of the piston flange 115 can be held in a wider area. Furthermore, the piston flange 115 of each size syringe 110 can be hold | maintained on a common center axis | shaft by arrange | positioning the flange receptacles 12a-12e and 13a-13e concentrically.

  In the embodiment described above, the piston holding mechanism 10 has five stages of flange receivers 12a to 12e and 13a to 13e, but the number of flange receiver stages is arbitrary as long as it is two or more.

[Cylinder holding mechanism]
Next, the cylinder holding mechanism 30 will be described.

  A perspective view of the cylinder holding mechanism 30 shown in FIG. 1 is shown in FIG. The operation of the cylinder holding mechanism 30 shown in FIG. 6 is shown in FIGS.

  The illustrated cylinder holding mechanism 30 includes a pair of cylinder pressers 32 that hold the outer peripheral surface of the cylinder 111 of the syringe 110 from the outside, and a lever 36 that is manually operated to open and close the cylinder presser 32.

  In order to support the cylinder presser 32, the cylinder holding mechanism 30 is opposed to the main shaft 50 in a direction perpendicular to the moving direction of the main shaft 50, and is opposed to the main body of the chemical liquid injector 100 (see FIG. 1). The cylinder retainer 32 and one or a plurality of guide shafts 35 are fixed to the cylinder retainer 32 so as to be spanned between the cylinder retainers 32 in parallel with the opposing direction of the cylinder retainers 32. The pair of cylinder pressers 32 are supported by the guide shaft 35 so as to be slidable so as to be movable in directions opposite to each other.

  As shown in FIGS. 6 and 7, a coil spring 38 is disposed between the base 31 and the cylinder presser 32 as biasing means for biasing the pair of cylinder pressers 32 toward each other. In the illustrated example, the coil spring 38 is shown as the biasing means, but any means can be used as the biasing means as long as the cylinder presser 32 can be biased as described above.

  When the biasing means is the coil spring 38, the coil spring 38 can be easily supported between the base 31 and the cylinder presser 32 by passing the coil spring 38 through the guide shaft 35. Further, when the liquid injector 100 is an apparatus used in the vicinity of the MRI apparatus, such as an apparatus for injecting an MRI contrast agent into a subject for an MRI examination, the components constituting the liquid injector 100 are non-magnetic materials. Need to be. In that case, the coil spring 38 can be a resin spring.

  The lever 36 is integrally provided with a cam 37 that works to move the pair of cylinder pressers 32 away from each other against the urging force of the coil spring 38. The lever 36 is supported by the main shaft 50 so as not to move in the axial direction of the main shaft 50 but to rotate only in the circumferential direction. When the main shaft 50 itself is supported so as to be able to rotate arbitrarily, the lever 36 may be fixed to the main shaft 50.

  The cam 37 has a rod-shaped portion extending radially outward from the swing center of the lever 36 and opposite to each other, and both ends of the rod-shaped portion are positioned between the pair of cylinder pressers 32. It acts on the cylinder presser 32. On the other hand, each cylinder retainer 32 is formed with a groove-like cam receiver 32c on which the tip portions on both sides of the cam 37 act.

  The relationship between the lever 36 and the cam 37 can be as shown in FIGS. 7 and 8, for example. In other words, the cam 37 can be formed on the lever 36 such that the pair of cylinder pressers 32 moves within the range shown in FIGS. 7 and 8 by the operation of the lever 36.

  FIG. 7 shows a state where the lever 36 is not operated. In this state, the lever 36 is in the first position, and the cam 37 is in a posture substantially perpendicular to the direction in which the cylinder presser 32 faces. The cylinder presser 32 is pressed against the cam 37 by the urging force of the coil spring 38, so that the distance between them is the narrowest.

  FIG. 8 shows a state in which the lever 36 is operated and rotated to the second position. In this state, the cam 37 rotates integrally with the lever until the cam 37 assumes a posture substantially parallel to the opposing direction of the cylinder presser 32 as the lever 36 rotates. As the cam 37 rotates, the cylinder retainer 32 moves in the direction in which the distance between the cylinder retainers 32 increases against the biasing force of the coil spring 38. When the lever 36 reaches the second position, the distance between the cylinder retainers 32 is maximum. It becomes.

  As described above, the distance between the cylinder pressers 32 can be continuously changed by operating the lever 36. Thus, the cylinder 111 having an arbitrary outer diameter can be held without using an adapter as long as it is within the interval of the cylinder presser 32. Here, it is preferable that the amount of movement of each cylinder presser 32 by the operation of the lever 36 is equal. Since the movement amount of each cylinder presser 32 is equal, the position of the central axis of the cylinder 111 to be held in the opposing direction of the cylinder presser 32 can be made constant regardless of the diameter of the cylinder 111. In order to equalize the movement amount of each cylinder presser 32 by the operation of the lever 36, the balance of the urging force of each cylinder presser 32, the slidability of each cylinder presser 32 on the guide shaft 35, cam 37 / cam What is necessary is just to set the shape etc. of the receptacle 32c suitably.

  In order to be able to hold the cylinder 111 stably, the cylinder presser 32 has support surfaces 32b that are recessed in a V-shape on opposite surfaces. The cylinder 111 is held between the support surfaces 32b. By having the V-shaped support surface 32b, the outer peripheral surface of the cylinder 111 is supported at four points in the circumferential direction, whereby the cylinder 111 can be held more stably.

  Further, by making the support surface 32b V-shaped, the center axis of the cylinder 111 to be held in the direction perpendicular to the axial direction of the cylinder presser 32 and the axial direction of the cylinder 111 (in the illustrated example, the vertical direction). The position can be constant regardless of the diameter of the cylinder 111. By combining this V-shaped support surface 32b and equalizing the amount of movement of each cylinder presser 32, a plurality of types of cylinders 111 having different diameters can be held in a fixed posture on a fixed central axis. Can do.

  A flange receiving groove 32a into which the cylinder flange 113 (see FIG. 2) is inserted is formed on the opposing surfaces of the cylinder retainers 32. The position of the cylinder 111 in the axial direction can be determined by inserting the cylinder flange 113 into the flange receiving groove 32a and holding the cylinder 111 by each cylinder retainer 32. The size and shape of the flange receiving groove 32a may be arbitrary as long as the cylinder flange 113 of the cylinder 111 of the maximum size that can be held by the cylinder holding mechanism 30 can be inserted.

  When the piston holding mechanism 10 is advanced in a state where the cylinder 111 and the piston flange 115 of the syringe 110 are respectively held by the cylinder holding mechanism 30 and the piston holding mechanism 10 described above, a force in the forward direction is applied to the syringe 110. Works. However, the syringe 110 does not actually move in the forward direction only by pressing the front surface of the cylinder flange 113 against the front inner surface of the flange receiving groove 32a. This is the same even when the syringe 110 of any size is held, and therefore, the inner surface on the front side of the flange receiving groove 32a is in the front-rear direction of the syringes 110 of all sizes that can be held by the chemical liquid injector 100. It can be set as the syringe holding position reference plane S0 (see FIG. 1) for determining the position. The dimensions of each part of the cylinder holding mechanism 30, the dimensions of each part of the piston holding mechanism 10, the relative positional relationship between the cylinder holding mechanism 30 and the piston holding mechanism 10, the amount of movement of the main shaft 50, etc. It is possible to design based on S0.

  The cylinder holding mechanism 30 described above includes the lever 36 that is operated to increase the distance between the pair of cylinder pressers 32, but the lever 36 is not an essential component in the present invention.

  For example, the tip portions of a pair of cylinder retainers 32 (ends on the side where the cylinder 111 is inserted when the cylinder 111 is inserted so that the cylinder flange 113 is inserted into the flange receiving groove 32a, As shown in the figure, the opposing surfaces are inclined with respect to the insertion direction of the cylinder 111 so that the distance between them increases toward the tip. In this case, the inclination angle and the shape of the opposing surfaces of the cylinder presser 32 are designed so that the cylinder presser 32 is pushed and expanded by the cylinder 111 as the cylinder 111 is inserted between the pair of cylinder pressers 32. As a result, the cylinder 111 can be held between the cylinder pressers 32 without requiring the lever 36.

  Hereinafter, several forms of the cylinder holding mechanism that does not require a lever will be described with reference to the drawings.

  10 to 13 show a cylinder holding mechanism in which a cylinder presser 32 is supported on a guide shaft 35 via a slide bearing 41. The slide bearing 41 is a bearing configured to linearly move in the axial direction, and is inserted into a guide hole 32 d formed in the cylinder presser 32 and fixed to the cylinder presser 32. Thus, by supporting the cylinder presser 32 via the slide bearing 41, the cylinder presser 32 can move more smoothly on the guide shaft 35 in the axial direction. As a result, as shown in FIG. 10, when the pair of cylinder pressers 32 are closed, the cylinder presser is simply pushed in between the cylinder pressers 32 from above the cylinder presser 32 (front end side). 32 opens against the biasing force of the coil spring 38. Further, the cylinder 111 is pushed in, and the cylinder 111 is held by the outer peripheral surface of the cylinder 111 being sandwiched between V-shaped support surfaces 32 b formed on the cylinder presser 32. Due to the action of the slide bearing 41, the force for pushing the cylinder 111 may be smaller, so that the cylinder 111 can be held in the cylinder holding mechanism 30 more smoothly and easily. Of course, the cylinder presser 32 can be opened and closed by the user directly moving the cylinder presser 32 manually. In this embodiment, the slide bearing 41 is used to smoothly slide the cylinder presser 32 with respect to the guide shaft 35, but a DU bush may be used instead of the slide bearing 41.

  The cylinder holding mechanism shown in FIGS. 10 to 13 is not provided with a lever, so that the structure related to the lever is different from the cylinder holding mechanism shown in FIG. This is different from the cylinder holding mechanism shown in.

  Specifically, the number of the guide shaft 35 is one, and the base 31 to which the guide shaft 35 is fixed is formed at a flat portion 31a extending in parallel with the axial direction of the guide shaft 35 and at both ends of the flat portion 31a. And a rising portion 31b. Both ends of the guide shaft 35 are fixed to the rising portion 31b. In addition, a semi-cylindrical convex portion 31c extending in parallel with the axial direction of the guide shaft 32 is formed on the surface of the flat portion 31a facing the cylinder retainer 32, while the convex portion 31c is formed on the cylinder retainer 32. A concave groove 32e extending in parallel with the axial direction of the guide shaft 35, into which the portion 31c is fitted, is formed. Thereby, even if the number of the guide shafts 35 is one, the cylinder presser 32 can be prevented from rotating in the circumferential direction of the guide shaft 35.

  The support structure of the cylinder presser 32 described above may be configured in the same manner as that shown in FIG. The structure of this embodiment may be applied to FIG.

  FIGS. 13 to 14 show other forms of cylinder holding mechanisms that do not require a lever. In this embodiment, no bearings or bushes are used. Instead, two pulleys 42 are attached to each cylinder presser 32, which is different from the embodiment shown in FIGS. About another structure, you may be the same as that of the form mentioned above.

  The pulley 42 is supported by the cylinder presser 32 so as to be rotatable around an axis perpendicular to the moving direction of the cylinder presser 32 at a position facing the convex portion 31 c of the base 31. In this embodiment, the pulley 42 has a pincushion mold having the smallest diameter in the axial center so that the shape seen from the side substantially matches the cross-sectional shape of the semi-cylindrical convex portion 31c of the base 31. Yes. The cylinder retainer 32 is supported in a state where the outer peripheral surface of the pulley 42 is placed on the convex portion 31 c of the base 31. Therefore, when the force in the direction along the guide shaft 35 acts on the cylinder presser 32, the cylinder presser 32 can move along the guide shaft 35 while the pulley 42 rolls on the convex portion 31c. As a result, the cylinder presser 32 can be moved with a small force. As a result, as in the case of using a slide bearing or a DU bush, the cylinder holding mechanism is more smoothly and easily held. Will be able to.

  In the cylinder holding mechanism shown in FIGS. 13 to 14, each cylinder presser 32 supports two pulleys 42, but the number of pulleys 42 may be arbitrary. Further, the pulley 42 may be supported by the cylinder presser 32 so as to roll on the guide shaft 35, or may be disposed between the guide shaft 35 and the convex portion 31 c of the base 31. You may be supported so that it may contact | abut both of the convex parts 31c. Furthermore, in the above embodiment, the pulley 42 is supported by the cylinder presser 32. However, the pulley 42 is rotatably supported on the flat portion 31a of the base 31, and the cylinder presser 32 is mounted on the pulley 42. It can also be supported to move by rotation of 42.

  As mentioned above, although two forms of the cylinder holding mechanism which do not require the lever for opening and closing are shown, it is possible to combine these forms and to have a configuration including both the slide bearing 41 and the pulley 42.

[Operation of chemical injection device]
Next, the operation of the chemical liquid injector described above will be described mainly with respect to the operation of the chemical liquid injector 100 shown in FIGS.

  In the initial state, the piston holding mechanism 10 is in the most retracted position.

  In this state, first, the operator rotates the lever 36 of the cylinder holding mechanism 30 to the second position to open the pair of cylinder pressers 32. Next, the operator prepares the syringe 110 filled with the chemical solution, aligns the position of the cylinder flange 113 of the prepared syringe 110 with the position of the flange receiving groove 32a, and then moves the lever 36 from the second position to the first position. Rotate to the position of. By rotating the lever 36, the interval between the cylinder pressers 32 is narrowed, and the support surface 32 b comes into contact with the outer peripheral surface of the cylinder 111. Further, the cylinder flange 113 is inserted into the flange receiving groove 32a by narrowing the interval between the cylinder retainers 32. As a result, the syringe 110 holds the portion of the cylinder 111.

  Since the pair of slidable cylinder holders 32 are pressed against the outer peripheral surface of the cylinder 111 using the biasing force of the coil spring 38, the cylinder 111 having an arbitrary outer diameter can be held.

  When the cylinder holding mechanism does not include a lever for opening and closing the cylinder presser 32 as shown in FIGS. 10 to 14, for example, between the pair of cylinder pressers 32 closed by the biasing force of the coil spring 38. By pushing the cylinder 111 into the cylinder 111, the cylinder 111 can be held between the support surfaces 32b of the cylinder retainer 32. Alternatively, the operator applies the force directly to the cylinder presser 32 and manually opens it, inserts the cylinder 111 therebetween, and releases the force applied to the cylinder presser 32, whereby the cylinder 111 is supported on the support surface 32 b of the cylinder presser 32. Can also be held between.

  Next, the operator moves the operating member 14 of the piston holding mechanism 10 forward or backward in accordance with the size of the syringe 110, and changes the swing angle of the flange holding members 12, 13 to the flange receivers 12 a to 12 e and 13 a to 13 e. Is adjusted to an appropriate angle at which the piston flange 115 can be received.

  At this time, the flange holders 12a to 12e and 13a to 13e can be engaged with each other when the flange holding members 12 and 13 are at a swing angle at which the piston flange 115 of the corresponding size can be received. For example, the flange holding members 12 and 13 and the frame 11 can be provided with an engagement structure that holds the holding members 12 and 13 at the swing angle. It is preferable to have such an engagement structure. Thereby, the flange holding members 12 and 13 can swing stepwise while having a click feeling due to engagement / disengagement of the engagement structure, and the adjustment of the swing angle of the flange holding members 12 and 13 is facilitated. be able to. The engaging structure can have, for example, a convex portion provided in one member and a concave portion provided in the other member. The engaging structure may be provided not on the frame holding members 12 and 13 and the frame 11, but on other members that move relative to each other, for example, the frame holding member 12 and the operating member 14, or the frame 11 and the operating member 14. .

  When the swing angle of the flange holding members 12 and 13 is adjusted, if the difference in swing angle between the adjacent flange receivers 12a to 12e and 13a to 13e is small, the flange holding members 12 and 13 are set to an appropriate angle. It may be difficult to understand what is being done. Therefore, in order for the operator to intuitively recognize the correspondence between the size of the syringe 110 and the flange holding members 12 and 13, the flange holding members 12 and 13 are swung by a predetermined swing receiving the piston flange 115. It is preferable that a different color is visually recognized for each angle. For example, the flange holding members 12 and 13 may be color-coded for each predetermined swing angle that receives the piston flange 115. Corresponding to the color coding of the flange holding members 12 and 13, if the syringe 110 is also color-coded according to its size, the colors of both are visually compared, and the swing angle of the flange holding members 12 and 13 and the combination of the syringe 110 It is possible to visually determine whether or not is appropriate. Specifically, the color classification of the flange holding mechanisms 12 and 13 and the syringe 110 is, for example, coloring at least a part of the piston flange 115 with a different color for each size, and at least a part of each of the flange receivers 12a to 12e and 13a to 13e. (E.g., the bottom surface and / or the inner peripheral surface) is colored the same color as the piston flange 115 that it should receive. The colored portions of the piston flange 115 and the flange receivers 12a to 12e and 13a to 13e may be arbitrary as long as the operator can easily visually recognize the correspondence between them.

  As a result, the flange holding member 12, 13 can be swung so that the piston flange 115 is received by the flange receivers 12 a to 12 e and 13 a to 13 e of the same color as the piston flange 115. 13 swing angles can be adjusted.

  Here, by coloring the piston flange 115 and the flange receivers 12a to 12e and 13a to 13e, the flange holding members 12 and 13 are visually recognized in different colors for each predetermined swing angle at which the piston flange 115 is received. An example configured is shown. However, as another means for visually recognizing the flange holding members 12 and 13 in different colors for each predetermined swing angle, an LED (light emitting diode) can be used.

  Some LEDs emit light of each color of red, green, and blue, and any color can be emitted by combining these colors. Therefore, for example, as shown in FIG. 15, the piston holding mechanism 10 can include one or a plurality of LED units 15 that can change the emission color by control. The number and attachment positions of the LED units 15 are arbitrary as long as the user can easily visually recognize the light emission by the LED units 15. In the form shown in FIG. 15, two LED units 15 are attached to both ends of the upper surface of the frame 11 (see FIG. 4), but one or more LEDs are provided on at least one of the pair of flange holding members 12 and 13. The unit 15 may be attached.

  The LED unit 15 can have, for example, a plurality of LED elements that emit light of different colors. In this case, light of any color can be emitted by appropriately controlling the driving of each LED element by causing only a single LED element to emit light or combining a plurality of LED elements to emit light. Alternatively, the LED unit 15 can include a multi-color LED that emits light of any color. A multi-color LED is a red LED chip, green LED chip and blue LED chip enclosed in a single package. Similarly, only a single chip or a combination of multiple chips emits light. By doing so, light of any color can be emitted.

  Regardless of which type of LED unit 15 is used, the light emission color of the LED unit 15 varies depending on the swing angle of the flange holding members 12, 13. It is controlled so that light of the same color as the color of the piston flange 115 received is emitted. For the control of the emission color of the LED unit 15, for example, a sensor 18 for acquiring data related to the swing angle of the flange holding members 12 and 13, which will be described later with reference to FIG. 16, can be used. Since the output value of the sensor 18 changes according to the swing angle of the flange holding members 12, 13, the LED unit 15 is controlled by the LED unit 15 according to the output value from the sensor 18. , 13 can emit light of a desired color according to the rocking angle.

  As described above, when the LED unit 15 emits light in different colors according to the swing angle of the flange holding members 12 and 13, the flange receivers 12a to 12e and 13a to 13e may be colored, It may not be colored.

  In this way, by causing the LED unit 15 to emit light with a different color for each predetermined swing angle of the flange holding members 12 and 13 that receive the piston flange 115, the flange holding members 12 and 13 have a piston 110 of any size of the syringe 110. The concept of visually determining whether or not the swing angle is suitable for the flange 115 can be applied to the determination of which size of the cylinder 111 the cylinder holding mechanism 30 holds. Can do.

  For example, as shown in FIG. 15, the cylinder holding mechanism 30 can include one or more LED units 34. Similar to the LED unit 15 used in the piston holding mechanism 10, the LED unit 34 can change the emission color by control, has a plurality of LED elements that emit light of different colors, and any Any of those having a multi-color LED capable of emitting light can be used. The number and position of the LED units 34 are arbitrary as long as the user can easily visually recognize the light emitted by the LED unit 34. In the form shown in FIG. 15, one LED unit 34 is attached to each cylinder retainer 32 (see FIG. 6, etc.), but the LED unit 34 may be attached to only one cylinder retainer 32. A plurality of LED units 34 may be attached to one cylinder presser 32.

  The LED unit 34 controls the emission color so that light of a different color is emitted at predetermined intervals corresponding to the diameter of the cylinder 111 held by the cylinder holding mechanism 30 according to the interval between the pair of cylinder pressers 32. . The light emission color of the LED unit 34 is the piston 114 of the piston 114 corresponding to the cylinder 111 held by the cylinder holding mechanism 30 when the flange receivers 12a to 12e and 13a to 13e of the flange holding members 12 and 13 are colored. The color is the same as the color colored on the flange 115. Alternatively, when the flange holding members 12 and 13 are illuminated by the LED unit 15, the LEDs that illuminate the flange holding members 12 and 13 when the syringe 110 is appropriately held by the piston holding mechanism 10 and the cylinder holding mechanism 30. The light emission colors of the LED units 15 and 34 are controlled so that the color of the light emitted from the unit 15 and the color of the light emitted from the LED unit 34 that illuminates the cylinder holding mechanism 30 are the same color.

  For the control of the emission color of the LED unit 34, for example, a sensor 38 for acquiring data relating to the distance between the pair of cylinder pressers 32, which will be described later with reference to FIG. Since the output value of the sensor 38 changes according to the interval of the cylinder presser 32, the LED unit 34 controls the LED unit 34 according to the output value from the sensor 38. Can emit light of any color.

  As described above, the LED unit 34 is provided in the cylinder presser 32 so as to emit light of different colors according to the size of the syringe 110 that is held, and the light emission color of the LED unit 34 is changed to the flanges of the flange holding members 12 and 13. The cylinder holding mechanism 30 and the piston holding mechanism 10 are syringes by making them correspond to the colors colored on the receivers 12a to 12e and 13a to 13e or the light emission color of the LED unit 15 provided on the flange holding members 12 and 13. It is possible to visually determine whether or not each unit 110 is appropriately held. In addition, since the LED unit 38 changes its emission color according to the size of the syringe 110 held by the cylinder holding mechanism 30, the piston flange 115 does not need to be colored. A general syringe 110 in which 115 is not colored can be used.

  After adjusting the swing angle of the flange holding members 12 and 13, the piston holding mechanism 10 is advanced until the flange receivers 12 a to 12 e and 13 a to 13 e abut on the piston flange 115. The advancement of the piston holding mechanism 10 can be performed by transmitting the rotation of the screw shaft 51 by the motor to the main shaft 50 via the connection mechanism 52, or the connection mechanism 52 can release the connection with the screw shaft 51. In the case of being configured, the piston holding mechanism 10 can be manually advanced in a state where the connection with the screw shaft 51 is released.

  As described above, in the syringe 110, the cylinder 111 is held by the cylinder holding mechanism 30 and the piston flange 115 is held by the piston holding mechanism 10.

  After the syringe 110 is held by the chemical solution injector 100, the injection conditions of the chemical solution are set and the injection operation of the chemical solution is started thereafter, as in the normal chemical solution injector.

  The injection condition can be obtained by calculation or the like by the chemical injection device 100 according to a predetermined algorithm based on the input data. Data necessary for setting the injection conditions can be input by the operator. Alternatively, when the syringe 110 includes a data carrier such as an RFID tag, the chemical injection device 100 includes a reader that reads data from the data carrier, and can use the data read by the reader as input data.

  As described above, according to the chemical injection device 100 of the present embodiment, the cylinder holding mechanism 30 can hold the cylinder 111 having an arbitrary diameter, and the piston holding mechanism 10 has a plurality of types with different sizes of the piston flange 115. The piston 114 can be held. Therefore, the chemical injection device 100 can hold a plurality of types of syringes 110 having different sizes without using an adapter. As a result, management of the adapter becomes unnecessary, and there is no problem of misuse of the adapter. This is particularly effective in the case of the chemical liquid injector 100 in which many types of syringes 110 are used, for example, a chemical liquid injector that injects a contrast medium for MRI examination.

  Further, in the above-described embodiment, the operator manually operates the cylinder holding mechanism 30 and the piston holding mechanism 10 to hold the cylinder 111 and the piston 115 of the syringe 110, respectively. Information on whether the syringe 110 is held cannot be obtained.

  Therefore, for example, as shown in FIG. 16, in the chemical injection device 100, the cylinder holding mechanism 30 and the piston holding mechanism 10 can have sensors 38 and 18, respectively.

  The sensor 38 included in the cylinder holding mechanism 30 is a sensor for acquiring data related to the distance between the cylinder pressers 32 in a state where the pair of cylinder pressers 32 shown in FIG. The interval between the cylinder pressers 32 corresponds to the diameter (outer diameter) of the cylinder 111 held by the cylinder holding mechanism 30. Since the diameter of the cylinder 111 varies depending on the size of the syringe 110, the size of the held syringe 110 can be determined from the interval between the cylinder pressers 32.

  For example, at least one of the two cylinder retainers 32 is spaced from the position of the cylinder retainer 32 when the lever 36 is at the first position (see FIG. 7). The movement amount of the cylinder presser 32 up to the position of the cylinder presser 32 in the held state can be detected by the sensor 38 and obtained from the detected movement amount. As such a sensor 38, for example, a linear sensor can be used.

  On the other hand, the sensor 18 included in the piston holding mechanism 10 is a sensor for acquiring data relating to the swing angle of the pair of flange holding members 12 and 13 shown in FIG. As described above, the swing angle of the flange holding members 12 and 13 corresponds one-to-one with the diameter of the piston flange 115 to be held. Since the diameter of the piston flange 115 is normally different for each size of the syringe 110, the size of the held syringe 110 can be determined from the swing angle of the flange holding members 12 and 13.

  The swing angle of the flange holding members 12 and 13 is obtained from the detected position by detecting the position of the flange holding members 11 and 12 or the position of the operating member 14 for operating the flange holding members 11 and 12 by the sensor 18. be able to. As such a sensor 18, for example, a linear sensor can be used.

  The chemical injection device 100 shown in FIG. 16 is operated by a syringe determination unit 62 that determines the size of the syringe 110 based on outputs from these sensors 18 and 38 and a drive mechanism 65 that pushes the piston 114 into the cylinder 111. It further has a control unit 61 for controlling the above, an input device 63, and a display device 64.

  The syringe determination unit 62 determines which size of the syringe 110 each of the piston holding mechanism 10 and the cylinder holding mechanism 30 holds based on the detection results of the sensors 18 and 38. If the piston holding mechanism 10 and the cylinder holding mechanism 30 hold the cylinder 110 appropriately, the sizes of the syringes 110 obtained from the sensors 18 and 38 are the same. However, if the cylinder presser 32 does not hold the cylinder 111 properly, the flange holding members 12 and 13 do not hold the piston flange 115 properly, or both, the sensors 18 and 38 The sizes of the syringes 110 obtained from the detection results are different.

  Therefore, when the size of the syringe 110 obtained from the detection results of both the sensors 18 and 38 is the same size, the syringe determination unit 62 determines that the syringe 110 of that size is held and holds it. Information regarding the size of the syringe 110 that is being operated is output to the control unit 61. On the other hand, when the sizes of the syringes 110 obtained from the detection results of the sensors 18 and 38 are different sizes, the syringe determination unit 62 is appropriately held by the cylinder presser 32 and / or the piston holding members 12 and 13. And information to that effect is output to the control unit 61.

  The input device 63 is a device for the operator to input data necessary for setting the injection condition of the chemical liquid and a command for starting / stopping the chemical liquid injection operation. The data necessary for setting the injection conditions includes, for example, the type of drug solution and the physical information of the subject (sex, height, weight, etc.). Examples of the input device 63 include a touch panel, a key switch, and a combination thereof. The display device 64 is a device for displaying an input screen for an input operation by the input device 63, a screen indicating a state of injecting a chemical solution, and other necessary information. Examples of the display device 64 include a liquid crystal display panel and a touch panel. The touch panel can serve as both the input device 63 and the display device 64.

  The control unit 61 calculates the injection condition of the chemical based on the determination result output from the syringe determination unit 62 and the data input from the input device 63, and the drive mechanism 65 that moves the piston holding mechanism 10 forward and backward. The overall operation of the chemical liquid injector 100 is controlled, such as controlling the operation. Examples of the injection conditions calculated by the control unit 61 include an injection speed of the chemical solution, an injection amount of the chemical solution, and the like.

  In addition, when the determination result that the syringe 110 is not properly held is output from the syringe determination unit 62, the control unit 61 displays a warning to that effect on the display device 64 and pays attention to the operator. Prompt. On the other hand, when the syringe 110 is appropriately held, that is, when information on the size of the held syringe 110 is output from the syringe determination unit 62, the control unit 61 uses this information to inject Calculate the conditions.

  When the injection condition is calculated, the control unit 61 controls the operation of the drive mechanism 65 so that the chemical solution is injected according to the calculated injection condition. As a result, the piston 114 is advanced while the syringe 110 is appropriately held, and the chemical solution is appropriately injected.

  In the embodiment described above, the case where the chemical liquid injector 100 is provided with the sensors 18 and 38 in both the piston holding mechanism 10 and the cylinder holding mechanism 30 has been described. However, the sensor 38 for the cylinder presser 32 and the sensor 18 for the flange holding members 12 and 13 function sufficiently even when used alone. Therefore, in the present invention, it is not necessary that both the piston holding mechanism 10 and the cylinder holding mechanism include the sensors 18 and 38, and only the sensor 38 for the cylinder presser 32 or the sensor 18 for the flange holding members 12 and 13. You may have only. Even in that case, as long as the cylinder 111 or the piston 114 is appropriately held, the size of the held syringe 110 can be determined.

  By the way, in the actual liquid injector 100, normally, at least the cylinder holding mechanism 30, the piston holding mechanism 10 and the drive mechanism 65 in the configuration shown in FIG. In many cases, it is covered with a cover member and is configured as a single unit called an “injection head”, for example. Thereby, when inject | pouring a chemical | medical solution to a test subject, the syringe 110 can be installed near a test subject.

  Here, prior to actually injecting the chemical solution, the holding state of the syringe 110 by the cylinder holding mechanism 30 and the piston holding mechanism 10 is confirmed, the operation of the drive mechanism 65 is set, and the air is released from the syringe 110. There is a case to do. For convenience such as confirmation and setting, at least a part of the input device 63 such as buttons for various settings, a button for starting the operation of the drive mechanism 65, and a button for stopping the operation of the drive mechanism 65 is an injection head. Generally, it is provided.

  On the other hand, when a tomographic image of a subject is picked up by an imaging device such as a CT device or an MR device after injecting a chemical solution into the subject by the chemical solution injection device 100, the X from the imaging device is used while the imaging device is operating. Lines and electromagnetic waves are irradiated. Therefore, in order to prevent the operator from being exposed and to maintain the uniformity of the magnetic field, the operator often evacuates from the examination room in which the imaging device and the injection head are arranged during operation of the imaging device. However, it may be necessary to stop the injection due to some trouble that occurs during the injection of the chemical solution, or there may be a situation where the operator has to withdraw from the examination room before the start of the injection.

  Therefore, the chemical injection device 100 is provided with a button for starting the operation of the drive mechanism 65 and a button for stopping the operation of the drive mechanism 65 as a part of the input device 63 separately from the injection head. It is preferable to have the operation device 66 so that the start and start of the operation of the drive mechanism 65 can be operated not only from the injection head but also from the remote operation device 66. Although the input device 63 is connected to the control unit 61, the chemical injection device 100 further includes the remote operation device 66, and when a part of the input device 63 is included in the remote operation device 66, it is included in the remote operation device 66. The connection between the input device 63 and the control unit 61 may be a wireless connection or a wired connection.

  Furthermore, the remote operation device 66 includes a button for setting the operation of the drive mechanism 65 as a part of the input device 63, and the operation of the drive mechanism 65 can be set from the remote operation device 66. A part of the display device 64 may be included in the remote operation device 66. If the remote control device 66 has an input device 63 and a display device 64, these can be touch panels.

DESCRIPTION OF SYMBOLS 10 Piston holding mechanism 11 Frame 12, 13 Flange holding member 12a-12e, 13a-13e Flange receiving surface 14 Actuating member 15 LED unit 18 Sensor 30 Cylinder holding mechanism 31 Base 32 Cylinder presser 32a Flange receiving groove 32b Support surface 34 LED unit 35 Guide shaft 36 Lever 37 Cam 38 Sensor 41 Slide bearing 42 Pulley 50 Main shaft 51 Screw shaft 52 Connection mechanism 61 Control unit 62 Syringe determination unit 63 Input device 64 Display device 65 Drive mechanism 100 Chemical solution injection device 110 Syringe 111 Cylinder 113 Cylinder flange 114 Piston 115 piston flange

Claims (13)

A piston holding mechanism for holding a piston flange formed at the rear end of the piston in order to push the piston of the syringe into the cylinder;
Frame,
A pair of flange holding members supported by the frame so as to hold the piston flange from both diametrical sides;
An actuating member for actuating the pair of flange holding members;
Have
In order to hold the piston flange of at least a plurality of types of syringes with different piston flange sizes,
The flange holding member is supported by the frame so as to swing in a front-back direction in the front-rear direction, holds the piston flange of the largest syringe at the position of the rearmost end of the swing range, In order to hold the piston flange of the syringe of the minimum size in position, it has a plurality of flange receivers formed in a stepped manner in order from the maximum size to the minimum size among the plurality of sizes,
The operating member is a piston holding mechanism that is movably supported by the frame so as to swing the pair of flange holding members in the front-rear direction. The piston holding mechanism is supported so as to be movable in a direction of pushing the held piston into the cylinder,
The flange receiver has a bottom surface for pressing the piston flange from the rear surface, and a side surface rising from the bottom surface,
The bottom surface is parallel to a plane perpendicular to the moving direction of the piston holding mechanism when the flange holding member is swung at a predetermined angle to receive a piston flange of a syringe of any size that can be held. The piston holding mechanism according to claim 1, wherein the piston holding mechanism is formed as follows.   The corresponding flange receiver of the pair of flange holding members is formed so that the side surface abuts on the side surface of the piston flange when the flange receiver is holding the piston flange. The piston holding mechanism described in 1. In the syringe, the piston flange has a disk shape, and the diameter of the piston flange varies depending on the size,
The piston holding mechanism according to claim 2 or 3, wherein the side surface of the flange receiver is formed in an arc shape.   When the flange holding member is at a swing angle at which the flange receiver can receive the piston flange of the corresponding size, the flange holding member is held at the swing angle by releasably engaging. The piston holding mechanism according to any one of claims 1 to 4, further comprising an engagement structure.   The piston holding mechanism according to any one of claims 1 to 5, wherein the flange holding member is configured such that a different color is visually recognized for each predetermined swing angle that receives the piston flange.   The piston holding mechanism according to claim 6, wherein at least a part of each flange receiver is colored with a different color.   The piston holding mechanism according to claim 6, wherein the flange holding member is attached with an LED unit that emits light of a different color for each predetermined swing angle that receives the piston flange.   The piston holding mechanism according to any one of claims 1 to 8, further comprising a sensor for obtaining a swing angle of the pair of flange holding members. A chemical injection device that separately holds a cylinder and a piston of a syringe filled with a chemical, and injects the chemical by pushing the piston into the cylinder,
The piston holding mechanism according to any one of claims 1 to 8,
A cylinder holding mechanism for holding the cylinder;
A drive mechanism that advances the piston holding mechanism toward the cylinder holding mechanism or reverses the piston holding mechanism in the reverse direction;
A control unit for controlling the operation of the drive mechanism;
A chemical injection device. The piston holding mechanism further includes a sensor for obtaining a swing angle of the pair of flange holding members,
The cylinder holding mechanism is opposed to each other with a space therebetween to hold the outer peripheral surface of the cylinder, and is supported so as to be movable in the opposing direction, and is recessed in a V shape that supports the outer peripheral surface of the cylinder. we support surface comprises a pair of cylinders pressing with the opposing surface of each other and a sensor for determining the spacing of the pair of cylinders pressing,
A syringe determination unit for determining which size of the syringe is held based on the detection result of the sensor of the piston holding mechanism and the detection result of the sensor of the cylinder holding mechanism, and outputting the determination result to the control unit; liquid injector according to claim 1 0 having. If the syringe size obtained from the detection results of the sensors of both the piston holding mechanism and the cylinder holding mechanism is the same, the syringe determining unit determines that the syringe of that size is held, and each sensor If the size of the detection of the syringe derived from the result is a different size syringes each other, liquid injector according to claim 1 1, holding of the syringe is judged not to be properly carried out. Liquid injector according to any one of claims 1 0 to 1 2, further comprising a pre-filled syringe is the syringe.

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