JP5944451B2 - Syringe, cylinder holder, and chemical injection system - Google Patents

Description

  The present invention relates to a syringe and a cylinder holder suitable for performing injection at a high injection pressure using a drive mechanism such as an automatic injection device.

  In various fields including medical use, a syringe is used for injecting a liquid. Injection of high-viscosity chemicals such as contrast media for X-ray CT imaging and contrast media for MRI (Magnetic Resonance Imaging) requires high pressure and is difficult to operate manually. It takes time and effort. Therefore, it is common to inject using a mechanical syringe drive mechanism such as an automatic injection device. FIG. 11 shows a state in which the syringe 20 is attached to such an automatic injection apparatus 10. The automatic injection device 10 includes a cylinder holder 11, a piston holder 12, and a motor (not shown) inside. The cylinder holder 11 holds a flange 22 to fix the syringe outer cylinder 21, and the piston holder 12 is a piston. The flange 24 is held. By moving the piston holder forward or backward by the motor, the piston 23 can be moved relative to the syringe outer cylinder to inject liquid (discharge liquid from the syringe) or perform suction. FIG. 12 is a view showing a state in which a syringe is attached to the automatic injection device.

  As shown in FIG. 13, when a small-sized syringe is attached to this automatic injection device, a syringe outer cylinder is attached to the removable adapter 13 (which functions as a cylinder holder for the syringe). Further, it is mounted on the automatic injection device 10. FIG. 14 shows a state where the syringe is mounted on the automatic injection device.

  FIG. 15 is a view for explaining holding and positioning of the syringe by the cylinder holder of the automatic injection device shown in FIG. 11, and is a view of the syringe outer cylinder as seen from the rear side. That is, as shown in FIGS. 11 and 15A, the flange is fitted into the groove of the cylinder holder 11 with the flange cut portion 25 vertical. Next, the flange is fixed so as not to come off by rotating 90 °. FIG. 15B is a diagram showing the middle of rotation, and FIG. 15C is a use position.

  The cut portion of the flange is used for positioning as described above, and is also necessary for preventing the syringe from being damaged by rolling when left on a flat surface such as a desktop.

Moreover, the syringe shown here makes the syringe of the shape which has the prevailing shape which has a syringe outer cylinder and a piston large (100 mL, 200 mL). While a general 50-60 mL syringe has a pressure resistance of about 3 kg / cm ² , the pressure resistance is increased to about 20 kg / cm ² for injection of contrast medium.

  By the way, as a syringe for a contrast medium, there is a type without a piston. In this type, a female screw provided on a member fixing the packing and a male screw at the tip of the shaft on the injection device side are connected, and the shaft is driven back and forth to suck and inject contrast medium. However, since such a syringe without a piston is exclusively used for an injector, an automatic injection device must be used even when a drug solution is sucked. Therefore, during the diagnosis, the automatic injection device is occupied and the chemical solution cannot be sucked.

  On the other hand, a general-purpose syringe as shown in FIG. 11 and the like can suck a chemical solution even manually, and therefore does not occupy an automatic injection device during suction. There is an advantage that a chemical solution for the next inspection can be prepared in advance. Moreover, as shown in FIG. 11 and FIG. 13, there are merits such that the same injection device can be used by using an adapter even if the syringes have different sizes, and there are merits that the device can be easily mounted. .

  As described above, a syringe for injecting a medical solution such as a contrast agent has been improved in various ways so far. However, a large force is applied to the flange when injecting a high-viscosity drug solution such as a contrast agent. If there are few flange surfaces that receive pressure, the syringe may be damaged. If the injection is performed in a halfway state as shown in FIG. 15B, for example, if the flange is not rotated to a predetermined position, the pressure receiving area is small and the risk of breakage increases.

  In addition, recently, a mechanism for clamping an apparatus for injection using a relatively large syringe of about 200 mL by making the cylinder holder portion movable and more easily and reliably mounting the flange has been devised. FIG. 16 is an enlarged view of a cylinder holder portion of such an automatic injection device 10. This cylinder holder has two clamps 16, and before the syringe is mounted, the upper portions of the two clamps are open as shown in FIG. Then, in FIG. 17A (the upper left diagram in FIG. 17), the syringe is fitted into the two clamps 16 with the flange cut surface vertical and the syringe opened. As the fitting is continued, the two clamps 16 are pushed by the flange, rotate around the fulcrum 17 and are closed. Then, by rotating the syringe by 90 °, the flange cut surface 25 is fixed up and down as shown in FIG. FIG. 17C is a plan view of the fixed state viewed from above (the clamp portion is a cross-sectional view).

  However, even if such a clamping mechanism is used, if it is fixed at a halfway position on the way from FIG. 17 (a) to FIG. 17 (b), the pressure receiving area of the flange becomes small during injection, and Similarly, the risk of syringe breakage increases.

  Therefore, an object of the present invention is to provide a syringe that is not easily damaged even when a high-viscosity liquid is injected at a high pressure, and a cylinder holder that is used together with the syringe.

  The present invention relates to the following matters.

1. A syringe that is attached to a cylinder holder for holding a syringe flange by a cylinder holder groove and fixing the syringe, and can be used for an injection device,
The cylinder holder is provided with a positioning mechanism that can be fitted into the recess,
The syringe has a recess that fits with the positioning mechanism.

  2. 2. The syringe according to 1 above, wherein the recess is provided in a flange of the syringe.

  3. 2. The syringe according to claim 1, wherein the concave portion is provided in a reinforcing rib in which a rear end surface of the flange of the syringe is partially thickened.

  4). 4. The syringe according to any one of 1 to 3, wherein the positioning mechanism is a latch that is pushed by a coil spring.

  5. 4. The syringe according to any one of 1 to 3, wherein the positioning mechanism is a leaf spring having a claw.

6). A cylinder holder for holding the flange of the syringe according to any one of the above 1 to 3 by a cylinder holder groove and fixing the syringe to an injection device,
A cylinder holder having a positioning mechanism that fits into a recess provided in the syringe.

  7). 7. The cylinder holder as described in 6 above, wherein the positioning mechanism is a latch pushed by a coil spring.

  8). 7. The cylinder holder according to 6 above, wherein the positioning mechanism is a leaf spring having a claw.

  9. The cylinder holder according to any one of the above items 6 to 8, wherein the cylinder holder is integrated with the injection device.

  10. The cylinder holder according to any one of 6 to 8, wherein the cylinder holder is an adapter that is detachably attached to the injection device.

  11. 11. The cylinder holder according to any one of the above items 6 to 10, wherein the positioning mechanism and the recess are fitted when the cylinder holder is rotated 90 ° after the syringe is mounted on the cylinder holder. Cylinder holder.

  12 The injection apparatus which has a cylinder holder in any one of said 6-11, the piston holder which hold | maintains the piston of a syringe and can move relatively with respect to the said cylinder holder, and a drive mechanism which moves this piston holder.

  13. A chemical liquid injection system comprising the syringe according to any one of the above 1 to 3 and the above 12 injection devices.

  This application also discloses the following matters. That is, one of the disclosure matters of the present application is a syringe that is mounted on a cylinder holder for fixing a syringe by holding a flange of the syringe by a cylinder holder groove and can be used for an injection device, The present invention relates to a syringe characterized by having a guide that engages with a cylinder holder and defines a mounting direction of the mounted syringe.

  In one aspect of the disclosure of the present application, the guide is a protrusion having a thickness that does not fit into the groove of the cylinder holder, and the flange fits into the groove, while the guide does not fit into the cylinder holder groove. Engagement with the cylinder holder occurs, thereby prohibiting rotation of the cylinder and holding and fixing the syringe in a predetermined direction.

  At that time, if the cylinder holder having a vertical portion on the inner wall surface on the syringe side is formed on the one hand, a linear portion that engages with the vertical portion is formed on the guide. It is prohibited and the syringe can be held and fixed in a predetermined direction.

  Further, as the cylinder holder, there are used two clamps which are in a state where the two clamps are opened before the syringe is mounted, and the flange is fixed by operating so that the upper part of the clamp is closed inward together with the mounting of the syringe. It is also possible, in which case the guide can be adapted to the shape of the clamp so that rotation of the syringe is prohibited.

  Furthermore, the present invention is a syringe that is mounted on a cylinder holder for fixing a syringe by holding a flange of the syringe by a cylinder holder groove, and can be used for an injection device. A positioning mechanism that can be fitted is provided, and the syringe has a recess that fits with the positioning mechanism.

  The positioning mechanism is preferably a latch pressed by a coil spring or a leaf spring having a claw.

  Furthermore, this invention relates to the cylinder holder characterized by having the positioning mechanism which can be fitted to the recessed part of the syringe provided with these recessed parts.

  Further, the present invention can hold the syringe flange by the cylinder holder groove and fix the syringe by the cylinder holder groove, hold the piston of the syringe and move relative to the cylinder holder. The present invention relates to a chemical liquid injection system including an injection device having a piston holder and a drive mechanism for moving the piston holder.

  According to the present invention, the direction of the syringe is determined in a predetermined direction, that is, preferably the direction in which the flange cut portion faces vertically with respect to the mounting direction to the cylinder holder, and the fixed position can be confirmed. Is fixed. As a result, the contact area with the groove wall surface of the cylinder holder increases, and a sufficient pressure receiving area can be secured during injection. Therefore, stable injection can be performed with respect to the breakdown voltage.

It is a figure which shows one state of the syringe of other invention which this application discloses, and the state hold | maintained and fixed with the cylinder holder. (A-1) View from the back of the syringe, showing the state before the syringe is mounted (a-2) Top view of the syringe and syringe holder (b-1) View from the back of the syringe, showing the state after the syringe is mounted (B-2) Top view after mounting the syringe It is a figure which shows 1 form of the syringe and cylinder holder of this invention. (A) A view of the state before the syringe is mounted from the rear surface of the syringe (b) A view of the state after the syringe is mounted from the rear surface of the syringe It is a figure which shows 1 form of the syringe and cylinder holder of this invention. (A) A view of the state before the syringe is mounted from the rear surface of the syringe (b) A view of the state after the syringe is mounted from the rear surface of the syringe It is a figure which shows 1 form of the syringe and cylinder holder of this invention. (A) A view of the state before the syringe is mounted from the rear surface of the syringe (b) A view of the state after the syringe is mounted from the rear surface of the syringe (c) A top view of the syringe It is a figure which shows 1 form of the syringe and cylinder holder of this invention. (A) A view of the state before the syringe is mounted from the rear surface of the syringe (b) A view of the state during the syringe is mounted from the rear surface of the syringe (c) A state after the syringe is mounted is viewed from the rear surface of the syringe Figure It is a figure which shows one state of the syringe of other invention which this application discloses, and the state hold | maintained and fixed with the cylinder holder. (A) View of the syringe mounted from the front of the syringe (b) View of the syringe after mounted from the front of the syringe (c) Top view of the syringe mounted It is a figure which shows one state of the syringe of other invention which this application discloses, and the state hold | maintained and fixed with the cylinder holder. (A) View of the syringe mounted from the back of the syringe (b) View of the syringe after mounted from the back of the syringe (c) Top view of the syringe mounted It is a figure which shows 1 form of the syringe of other invention which this application discloses. It is a figure which shows 1 form of the syringe of other invention which this application discloses. It is a figure which shows 1 form of the syringe of other invention which this application discloses. It is a figure which shows a mode that a syringe is mounted | worn with an automatic injection apparatus. It is a figure which shows a mode that the syringe was mounted | worn with the automatic injection apparatus. It is a figure which shows a mode that a syringe is mounted | worn with an automatic injection apparatus using an adapter. It is a figure which shows a mode that the syringe was mounted | worn with the automatic injection apparatus. It is a figure explaining holding | maintenance and positioning of the syringe by the cylinder holder of the automatic injection apparatus shown in FIG. It is a figure which shows the cylinder holder provided with two movable clamps. It is a figure explaining holding and positioning of a syringe by a cylinder holder provided with two movable clamps. (A) View of the syringe mounted from the back of the syringe (b) View of the syringe after mounted from the back of the syringe (c) Top view of the syringe mounted

  The present invention will be described below with reference to the drawings. Specific examples of the present invention are shown in FIGS. 2, 3, 4, and 5, and those shown in FIGS. 1, 6, 7, 8, 9, and 10 are as follows. It is a specific example regarding the other invention which this application discloses.

  FIG. 1 is a view showing a syringe 30 in a form in which a guide is provided on the flange portion of the syringe, and (a-1) is a view of the state before the syringe is mounted, as viewed from the rear surface of the syringe, (a-2) These are the top views of a syringe and a syringe holder, (b-1) is the figure which looked at the mode after syringe mounting from the rear surface of a syringe, and (b-2) is a top view after syringe mounting.

  In this embodiment, a guide 31 is provided on the rear surface of the flange 22. On the other hand, the groove 14 of the cylinder holder 11 is formed with a thickness sufficient to fit the flange 22, but is formed with a groove width narrower than the thickness including the guide 31. Therefore, as shown in FIG. 1A, the flange is fitted into the cylinder holder 11 so that the guide 31 faces vertically. FIG. 1B is a diagram showing a state in which the flange 22 is fitted into the cylinder holder 11. In this example, since the inner wall surface 15 on the syringe side of the cylinder holder 11 has a straight portion, the guide 31 also has a straight portion, so that the syringe is only at a position where the flange cut portion 25 comes up and down. Is fixed and rotation is prohibited. Therefore, the area where the flange is held is large, and the pressure receiving area during injection can be increased.

  A guide can also be provided on the front side of the flange. FIG. 8 is a view of the syringe provided with the guide on the front side of the flange as viewed from the front end side. As shown in this figure, by providing the guide 33 on the front surface side (syringe tip side) of the flange with a thickness that does not fit at least in the cylinder holder groove, the flange 33 is cut as in the example of FIG. The syringe is mounted and fixed only in the direction in which the surface 25 is directed vertically.

  As the guide, the linear portion can be mounted more smoothly, but the position can be defined even with a guide 35 made up of a plurality of dots as shown in FIG. Moreover, if the distance between the two guides is shortened on the mounting side as in the guide 37 in the example of FIG.

  FIG. 2 is a diagram illustrating an example of a syringe in which a positioning cut 41 is provided in the flange cut portion 25 of the flange 22 as a recess to be fitted with the positioning mechanism. On the other hand, a latch 42 as a positioning mechanism for fitting with the positioning cut 41 is provided on the cylinder holder side so that the latch is always pushed by the coil spring 43 toward the center. When it is manually rotated 90 ° after being mounted on the cylinder holder in the direction as shown in FIG. 2A, the flange is fixed at the position where the positioning cut 41 and the latch 42 are engaged (FIG. 2B). . Since there is a click feeling at this time, the setting position can be confirmed even by touch, so the certainty is improved. In the present invention, the cylinder holder means a structure having a groove and holding the syringe flange by the groove to fix the syringe. Even if the cylinder holder is integrated with the injection device, Alternatively, it may be either removable such as an adapter as shown in FIG.

  FIG. 3 shows an example in which the positioning cut 51 is provided not on the flange cut portion 25 of the flange 22 but on the arc portion 26. In such a case, as shown in FIG. 3B, it is preferable that the latch 52 is provided on the side of the cylinder holder so that the latch 52 is pushed by the coil spring 53 toward the center. If it is manually rotated by 90 ° after being mounted on the cylinder holder in the direction as shown in FIG. 3A, the positioning cut 51 and the latch 52 are engaged (FIG. 3B), and the flange is fixed. As shown in this figure, it is preferable to provide the latches 52 on both sides because the fixing position is particularly stable.

  In the example of FIG. 2, the positioning cut is provided in the flange cut portion, and in the example of FIG. 3, the concave portion for positioning can be provided separately from the normal flange portion. An example is shown in FIG. In this example, a flange reinforcing rib 61 may be provided on the rear end face of the flange, and a part of the rib reinforcing rib 61 may be formed so as to be fitted with the latch 63. Here, as shown in FIG. 4 (c), the flange reinforcing rib 61 is obtained by partially thickening the rear end surface of the flange, thereby strengthening the flange and preventing breakage. In this example as well, as in the example shown in FIG. 2, after mounting on the cylinder holder in the direction of FIG. The flanges are fixed by meshing (FIG. 4B).

  FIG. 5 uses a syringe having a claw 72 on the cylinder holder side, while using a syringe having a positioning cut 51 on the arc portion 26 of the flange 22 as in the example shown in FIG. It is a figure which shows the example which provided 71. FIG. As shown in FIG. 5 (a), after the flange cut portion is vertically mounted on the cylinder holder, the syringe is rotated as shown in FIG. 5 (b), and is further rotated by 90 ° as shown in FIG. 5 (c). The claw 72 is fitted and fixed together with the positioning cut 51 and the click feeling.

  FIG. 6 is a diagram showing an example of an improved fixing method when the clamp as shown in FIGS. 16 and 17 is used. The syringe of this example has a structure in which a guide 81 is provided on the front surface of the flange of the syringe outer cylinder 80 as shown in FIG. 6A and 6B show how the syringe is mounted when viewed from the A direction (from the front end direction) in FIG. As shown in FIG. 6 (a), when the flange cut surface 25 is directed up and down and the syringe is pushed into the clamp 82 in an open state, the clamp 82 rotates around the fulcrum 83 as shown in FIG. 6 (b). The upper part of the clamp closes and the syringe is attached and fixed. Since the guide 81 is provided, the guide portion does not fit into the groove of the clamp, so that the syringe cannot be mounted at a position other than the position of the flange cut surface 25 coming up and down. Therefore, the pressure receiving area at the time of injection can be increased.

  FIG. 7 is also a diagram showing an example of an improved fixing method when the clamp as shown in FIGS. 16 and 17 is used. In the example of the syringe shown in FIG. 6, the guide is provided in the front direction of the flange. However, in the example of FIG. 7, a rib is provided on the rear surface of the flange of the syringe outer cylinder 90 as shown in FIG. It is said. 7A and 7B show how the syringe is mounted when viewed from the A direction (from the rear side) in FIG. 7C. Similarly, in this case, as shown in FIG. 7A, when the syringe is pushed into the clamp 92 with the flange cut surface 25 facing up and down, the clamp 92 rotates around the fulcrum 93 as shown in FIG. However, if the position of the flange cut surface is shifted due to the action of the guide 91, it cannot be mounted.

  The present invention has been described above with reference to typical examples, but the present invention is not limited to these examples, and various modifications can be made without departing from the gist of the present invention. In the above example, the pressure receiving area is maximized when the flange cut surface is in the vertical position. However, depending on the form of the cylinder holder, the flange cut surface may not necessarily be in the vertical position. And can be changed as appropriate.

  The syringe of the present invention is preferably used with an injection device, particularly an automatic injection device.

  When the syringe has a guide that engages with the cylinder holder and defines the mounting direction of the syringe to be mounted, a cylinder holder that can engage with the syringe and define the mounting direction of the syringe is used. Then, by using it together with an automatic injection device having a piston holder and a drive mechanism for the piston holder as described with reference to FIGS. 11 and 13, even a high-viscosity chemical solution can be injected easily. In particular, it is suitably used for injection of various contrast agents as a chemical solution.

  In addition, a well-known thing can be used for the structure of a piston holder, a drive mechanism, etc. of an automatic injection apparatus.

  Furthermore, the syringe of the present invention is preferably a general-purpose syringe that uses a combination of a syringe outer cylinder and a piston, but may be other types as long as it is a syringe that requires positioning and fixing of the flange surface.

  According to the present invention, it is possible to provide a syringe, a cylinder holder, and a chemical liquid injection system using them that are not easily damaged even when a high-viscosity liquid is injected at a high pressure.

10 automatic injection device 11 cylinder holder 12 piston holder 13 adapter 14 cylinder holder groove 15 cylinder holder inner wall surface 16 clamp 17 fulcrum 21 syringe outer cylinder 22 flange 23 piston 24 piston flange 25 flange cut part 26 arc part 30 syringe 31 guide 33 guide 35 Guide 37 Guide 41 Positioning cut 42 Latch 43 Coil spring 51 Positioning cut 52 Latch 53 Coil spring 61 Flange reinforcement rib 62 Positioning part 63 Latch 71 Plate spring 72 with pawl Claw 80 Syringe outer cylinder 81 Guide 82 Clamp 83 Support point 90 Syringe outer cylinder 91 Guide 92 Clamp 93 fulcrum

Claims (11)

A syringe that is attached to a cylinder holder for holding a syringe flange by a cylinder holder groove and fixing the syringe, and can be used for an injection device,
The cylinder holder is configured so that the syringe can be attached to the cylinder holder by fitting the flange from a direction parallel to the cylinder holder groove.
The flange is provided at the rear end of the syringe, and has a circular arc part centered on the axis of the syringe at a part of the outer periphery of the flange. Two positioning cuts having a concave part of the outer periphery of the flange are provided,
The syringe is positioned with respect to the cylinder holder at a position where the two positioning cuts are horizontal. The syringe according to claim 1 , wherein the two positioning cuts are provided at a 180-degree symmetrical position about the syringe axis.
  The syringe according to claim 1 or 2, wherein the cylinder holder has a positioning mechanism for fixing the syringe at a position where the two positioning cuts are horizontal.   The syringe according to claim 3, wherein the positioning mechanism is fitted with the two positioning cuts.   The syringe according to claim 3 or 4, wherein the positioning mechanism has a mechanism for pressing in a horizontal direction from an outer edge side of the flange.   The syringe according to claim 5, wherein the positioning mechanism is a latch pushed by a coil spring.   The syringe according to claim 5, wherein the positioning mechanism is a leaf spring having a claw that fits into the recess.   It has a piston, The syringe of any one of Claims 1-7 characterized by the above-mentioned.   The syringe according to any one of claims 1 to 8, wherein the syringe is filled with a chemical solution.   The syringe according to claim 9, wherein the drug solution is a contrast medium. The injection apparatus using the syringe has a piston holder that holds the piston and can move relative to the cylinder holder, and a drive mechanism that moves the piston holder. The syringe according to any one of the above.

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