JP2003033441A - Three-way cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-way cock, where a patient himself can switch flowing channels easily and accurately and an insoluble substance is made hard to clog, in the three-way stopcock used in a peritoneal dialysis circuit. SOLUTION: The three-way cock 1 comprises a main body 2 having three branching tubes 4 on the outer periphery of a cylindrical part 5, and a cock 3 which is rotatably fit to the inside of the main body 2 and is provided with flow paths 10 corresponding to the three branching tubes 4 and having a barrel part 6, and a lever 7 is provided in the cock 3. The barrel part 6 is provided with a protrusion 9 on the outer periphery thereof, and the cylindrical part 5 is provided with a recess 8 which can receive the protrusion 9. The protrusion 9 has a saw blade shape which reduces in the rotational direction and can rotate only in one direction. The barrel part 6 is provided with three flow paths 10 corresponding to three branching tubes 4, and the flow paths 10 join together within the barrel part 6. The joined flow path 11 has an arc shape formed along the periphery of the barrel part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way stopcock for switching a fluid passage. In particular, the present invention relates to a three-way stopcock suitable for peritoneal dialysis and suitable for injecting a drug solution into the abdominal cavity and discharging it from the abdominal cavity during peritoneal dialysis.

[0002]

2. Description of the Related Art Conventionally, as a medical flow path switching device used for peritoneal dialysis, a system in which the flow path is not opened as much as possible is adopted in order to prevent contamination in the flow path. However, such a system has a complicated circuit and requires a switching operation of the flow path when the chemical solution is injected or discharged. This switching operation is usually performed by a method of opening and closing the soft tube of the flow path with a clamp or the like, but a complicated operation such as simultaneously operating a plurality of clamps is required. In addition, it has been pointed out that if the operation is mistaken at that time, troubles such as backflow of chemical liquid and inflow of air may occur.

In order to prevent such troubles from occurring, Japanese Patent Publication No. 5028882/1990 is disclosed. It uses a three-way stopcock to connect a tube connected to a dialysate bag, a tube connected to a drain bag, and a tube connected to the patient's abdominal cavity without the use of multiple clamps. By operating the three-way stopcock, it is intended to inject the dialysate into the abdominal cavity and drain the dialysate from the abdominal cavity. However, this peritoneal dialysis device using a three-way stopcock switches the arm by rotating the arm to switch the valve, but there is also the operation of rotating the arm in the opposite direction. A complicated operation was required.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a peritoneal dialysis device used for such treatment of peritoneal dialysis, which can be performed safely, easily and surely when the patient himself or herself switches the flow path, and is insoluble. The purpose is to provide a three-way stopcock that does not easily get clogged.

[0005]

The present invention can solve the problems as follows.

(1) Consists of a main body having a branch pipe on the outer periphery of a cylindrical portion, and a cock having a body portion rotatably fitted in the cylindrical portion and having a flow path corresponding to the branch pipe. A three-way stopcock characterized in that the cock rotates only in one direction.

(2) A convex portion is provided on the outer circumference of the body portion, a concave portion is provided on the inner circumference of the cylindrical portion, and the convex portion has a saw blade shape that gradually decreases in the rotational direction. The three-way stopcock described in (1), which is characterized.

(3) A convex portion is provided on the inner circumference of the cylindrical portion, a concave portion is provided on the outer circumference of the body portion, and the convex portion has a saw-tooth shape which gradually decreases in the rotational direction. The three-way stopcock described in (1), which is characterized.

(4) The three-way stopcock according to (2) or (3), wherein a plurality of the recesses are provided.

(5) The three-way stopcock according to any one of (1) to (4), characterized in that the inside of the body portion at which the flow paths merge has an arc shape along the circumference.

(6) A rotation stopper for preventing one rotation is provided on the main body and the cock (1)
(3) Stopcock according to (5).

(7) A peritoneal dialysis device having the three-way stopcock described in (1) to (5).

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The three-way stopcock of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of the three-way stopcock of the present invention, and FIG. 2 is an exploded perspective view of the three-way stopcock of the present invention. FIG. 3 is a top perspective view of the three-way stopcock of the present invention. Figure 4
Is a partial cross-sectional side view of the three-way stopcock of the present invention, and FIG. 5 is a cross-sectional view taken along the line AA ′ of FIG. 4. FIG. 6 is BB ′ of FIG.
It is sectional drawing of a line.

The three-way stopcock 1 of the present invention has a main body 2 having a branch pipe 4 on the outer circumference of a cylindrical portion 5 and a main pipe 2 which is rotatably fitted therein to form a flow passage 10 corresponding to the branch pipe 4. Torso 6
And a cock 3 having. Further, the cock 3 is preferably provided with a lever 7 in order to improve operability. Further, a lid 12 for sealing the lower portions of the cylindrical portion 5 and the body portion 6 may be provided, or the body portion 6 may have a bottom.

As shown in FIG. 1, of the three branch pipes 4 provided on the outer periphery of the cylindrical portion 5, two of these branch pipes are arranged on a straight line, and the other branch pipe is formed on this straight line. They are arranged so that they intersect at right angles. Various connection portions can be set at the tip of the branch pipe 4 depending on the application. Three channels 10 are provided inside the body 6 so as to correspond to the three branch pipes 4, and the channels 10 merge inside the body 6. Further, instead of such a configuration, the intervals between the three branch pipes 4 and the flow paths 10 may be 120 degrees (not shown).

As shown in FIG. 5, the three-way stopcock 1 of the present invention is shown.
Is provided with a convex portion 9 on the outer periphery of the body portion 6, and the cylindrical portion 5
The concave portion 8 that can receive the convex portion 9 is provided in the. This convex portion 9 may be provided in a single number or a plurality of numbers. The number of recesses 8 is preferably plural, and more preferably 3 to 8. The three to eight recesses are preferably provided at equal intervals. By doing so, the three-way stopcock 1 can be brought into a desired open state or closed state.

Although not shown, a convex portion may be provided on the inner circumference of the cylindrical portion and a concave portion may be provided on the outer circumference of the body portion. When the cock 3 is rotated, the body 6 is also rotated, and the protrusion 9 is received in the recess 8, whereby the body 6 is locked at the position where the recess 8 is provided.

As shown in FIG. 5, the convex portion 9 preferably has a saw blade shape which gradually decreases in the rotation direction.
Thereby, when the cock 3 is rotated in one direction, the body 6
Is rotatable, but the engaging force is strong in the opposite direction so that it cannot rotate in the opposite direction. The shape of the concave portion 8 is not particularly limited as long as it is a shape capable of receiving the convex portion, and for example, as shown in FIG.
As will be understood from the above, the shape may correspond to the saw blade shape of the convex portion 9.

Further, instead of the saw blade shape of the convex portion 9 as described above, any structure may be used as long as it can rotate only in one direction, although not shown. For example, the protrusion may be formed in a leaf spring shape. By doing this, when operating in a rotatable direction, the leaf spring contracts and becomes rotatable,
Since the leaf spring spreads when it reaches the recessed portion, when the reverse rotation is attempted, the recessed portion and the leaf spring spread out and mesh with each other, so that the leaf spring can be rotated in one direction but cannot be reversed.

The convex portion 9 and the concave portion 8 for preventing the reverse rotation may be provided at the inner peripheral portion of the cylindrical portion 5 and the outer peripheral portion of the body portion 6 at intervals of 45 degrees at eight places, respectively. It is preferable to provide the concave portions 8 at eight locations and the convex portions 9 at two locations as indicated by, since the resistance between the concave portions 8 and the convex portions 9 is reduced and the rotating operation can be improved. The concave portion 8 is provided in the lower portion of the cylindrical portion 5 or the body portion 6 at the position where the branch pipe 4 and the flow path 10 are provided.
A total of eight recesses 8 are provided at intervals. Further, the convex portions 9 are provided at two places at intervals of 180 degrees.

Although the details will be described later by installing the convex portion 9 and the concave portion 8 at such positions, it is convenient for operating the three-way stopcock 1. Further, by providing the convex portion 9 and the concave portion 8 at each of eight positions in this manner, the cock 3 can be reliably locked at a target position and a click feeling is generated. You can avoid passing by. Further, in the case where the concave portions 8 are thus provided at eight places, the convex portions 9 have the function if they are provided at one place or more.

FIG. 7 is a top view when the cover 22 is attached to the three-way stopcock of the present invention. As shown in FIG. 7, a cover 22 was installed between the lever 17 of the three-way stopcock 21 and the branch pipes 14a, 14b, 14c, and the cover 22 was marked with characters indicating the operation status. The lever 17 is provided on the flow path 20b of the body 16 which is orthogonal to the other two flow paths 20a and 20c. It is preferable to add letters on the cover 22 in the order of “preparation”, “drainage”, “stop”, “fill”, “stop”, “injection”, and “end”.

The arrangement of characters on the cover 22 is the cylindrical portion 15
"Preparation" is attached at a position shifted by 45 degrees from the center branch pipe 14b which is orthogonal to the other two branches 14a and 14c provided in the above, and is then attached at 45 degree intervals in the order of the aforementioned characters. This is convenient because it is possible to recognize the open state of the flow path (working state of peritoneal dialysis).

In this way, "preparation" is made at the positions at 45 degree intervals.
When "drainage", "stop", "filling", "stop", "filling", and "end" are given in this order, and recesses are also provided at eight locations at 45 ° intervals, the body 16 is rotated and the lever 17 is moved. When the character attached to the cover 22 is pointed, the convex portion provided on the body portion 16 is received in the concave portion and temporarily locked,
The three-way stopcock 21 is in a state of characters attached to the cover 22.

At this time, if the convex portions are provided at two places at intervals of 180 degrees, the resistance of the concave portions is small and the operability is improved. When performing peritoneal dialysis using the three-way stopcock 21, the lever 17 is sequentially rotated to the positions marked with these letters so that the flow path is in a desired open state, and all operations are completed in one rotation.

Further, for example, when the branch pipe 14b has the lever 17, a protrusion or the like having a size capable of limiting the rotation of the lever 17 is provided on the cover 22 immediately in the opposite direction to the direction in which the lever 17 is to be rotated so that the lever 17 is unidirectional. It is also possible to adopt a configuration in which only one rotation is possible (not shown). By doing this, wrong operation can be prevented during peritoneal dialysis.

As shown in FIG. 6, inside the body 6,
The three flow paths 10 are formed from the outer circumference toward the center, and the portion where the three flow paths 10 merge is an arc-shaped flow path 11 along the circumference of the body portion 6. In this way, the inside of the body portion 6 has the arc-shaped flow path 11, so that if insoluble matter (such as fibrin or albumin) is present in the drainage solution of peritoneal dialysis, it is possible to use a conventional three-way stopcock. T
In the confluence of the right-angled flow passages like a letter shape, the flow passages may be clogged with insoluble matter, but in the case of the arc-shaped flow passages 11 as in the present invention, such a problem hardly occurs. The material for the three-way stopcock of the present invention is preferably a synthetic resin having chemical resistance such as polypropylene, but the material is not particularly limited and a metal or the like may be used.

Next, a method of using the three-way stopcock of the present invention will be described. FIG. 8 is a schematic diagram showing a communication state of the three-way stopcock of the present invention. For example, high-pressure steam sterilization is often performed during the manufacture of medical devices, but in the case of this sterilization method, it is normally sterilized with all the flow paths of the three-way stopcock open, and shipped with all the flow paths open. It is usually done.

When the three-way stopcock of the present invention is used by incorporating it into the peritoneal dialysis device in a state in which all the flow paths are open (see FIG. 8a), first rotate the lever by 45 degrees,
Close all channels before use (see Figure 8b).

Next, the tube connected to the patient's body is used as the branch pipe 14b, and the tube on the peritoneal dialysate discharge side is used as the branch pipe 1.
4a, the tubes on the peritoneal dialysate injection side are respectively connected to the branch tubes 14c, and when the lever is further rotated by 45 degrees in the same direction, the tubes on the patient side discharge side are opened, so that the drug solution stored in the abdominal cavity is opened. It can be discharged (see Figure 8c). After the discharge is completed, the flow path is closed again by rotating the same direction by 45 degrees (see FIG. 8d).

Next, before injecting the drug solution, the lever is further rotated 45 degrees in order to remove the air in the tube on the injection side (see FIG. 8e). At this time, the flow path is open on the injection side and the discharge side, and the air in the tube moves to the discharge side. After the air in the tube is removed, the lever is further rotated by 45 degrees, and all the flow paths are closed to prepare for injection of the drug solution (see FIG. 8f).

Then, when the lever is further rotated 45 degrees, the flow paths on the injection side and the patient side are opened to allow injection of the drug solution (see FIG. 8g). When the injection of the drug solution is finished,
Further, the lever is rotated by 45 degrees to close all the flow paths, and then the connection part between the tube on the patient side and the tube connecting the patient's body is disconnected to complete the series of operations (FIG. 8).
h)). As described above, the flow path can be switched in the same manner as in the conventional clamp by simply rotating the lever provided on the three-way stopcock by 45 degrees in a fixed direction and rotating it once.

(Example) Next, an example of the three-way stopcock of the present invention will be described with reference to the drawings. The three-way stopcock 21 shown in FIG. 7 includes a main body 12 having a cylindrical portion 15 and the cylindrical portion 1.
5 has three branch pipes 14a, 14b, 14c provided in 5, and is made of polypropylene, and a cock 17 having a body 16 rotatably fitted inside the main body 12
Was made of polypropylene.

Inside the body 16, three branch pipes 14a,
14b, 14c so as to correspond to the flow paths 20a, 20b,
20c is provided. These flow paths 20a, 20b, 2
The portion where 0c joins is the body 16 as shown in FIG.
The channel 211 was manufactured to have an arc shape along the circumference of the circle.

The lever 17 is provided on the upper part of the cock 17 and is installed so as to point in the same direction as the flow path 20b. Cylindrical part 1
5, concave portions are provided at eight locations at intervals of 45 degrees, and the body portion 16
In this case, convex portions for preventing reverse rotation were provided at two positions at 180 degree intervals. The convex portion provided on the body portion 16 has a saw blade shape that gradually decreases in the rotation direction. The shape of the recess is such that the projection can be received, and the shape corresponds to the saw blade shape of the projection.

Here, the outer diameter of the cylindrical portion 15 is set to 50 mm and the height is set to 20 mm, and the arc-shaped passage 2 where the inner diameter passages merge.
The diameter of 11 is set to 40 mm, and the flow paths 20a, 20b,
The diameter of 20c was 4 mm. Further, a cover 22 is provided on the cylindrical portion 15, and “preparation” and “drainage” are performed on the cover 22.
Characters were given clockwise in the order of "stop", "filling", "stop", "injection", and "end" at positions 45 degrees apart from the position where the branch pipe 14b was located.

The three-way stopcock 21 produced in this manner has a tube connected to the patient's body at one end and the branch pipe 14b at the other end.
, The other end of the tube connected to the bag of peritoneal dialysate at one end is connected to the branch pipe 14c, and the other end of the tube connected to the discharge bag for collecting the peritoneal dialysate at one end is connected to the branch pipe 14a. Each was connected and incorporated into a peritoneal dialysis machine.

In this manner, the peritoneal dialysis apparatus having the three-way stopcock 21 of the present invention is sequentially lavered according to the characters attached to the cover 22 attached to the three-way stopcock 21.
When rotating and using, the lever 17 does not reverse,
In addition, the positioning showed a good click feeling, and by stopping at the position where it was desired to be stopped, the peritoneal dialysate could be drained, filled, and injected without problems. In addition, since the three-way stopcock 21 is provided with characters as an operation procedure, it can be used without confusion. Furthermore, the flow path was not blocked by the insoluble matter.

[0039]

By using the three-way stopcock of the present invention in a circuit for peritoneal dialysis or the like, a complicated operation during peritoneal dialysis is unnecessary, and safe, simple and reliable operation is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-way stopcock of the present invention.

FIG. 2 is a top perspective view of the three-way stopcock of the present invention.

FIG. 3 is an exploded perspective view of the three-way stopcock of the present invention.

FIG. 4 is a side view of the three-way stopcock of the present invention.

5 is a cross-sectional view taken along the line AA ′ of FIG.

6 is a cross-sectional view taken along the line BB ′ of FIG.

FIG. 7 is a top view when a cover is attached to the three-way stopcock of the present invention.

FIG. 8 is a schematic diagram of an operation procedure of the three-way stopcock of the present invention.

[Explanation of symbols]

1 three-way stopcock 2 body 3 cooks 4 branch pipes 5 Cylindrical part 6 torso 7 lever 8 recess 9 convex 10 channels 11 Circular flow path 12 Lid 14a Branch pipe 14b Branch pipe 14c Branch pipe 15 Cylindrical part 16 torso 17 lever 18 recess 19 convex 20a channel 20b channel 20c channel 21 Three-way stopcock 211 Circular flow path 22 cover

Claims (5)

[Claims] 1. A main body having a branch pipe on the outer periphery of a cylindrical portion,
A three-way stopcock that is rotatably fitted in the cylindrical portion and has a cock having a body portion in which a flow path corresponding to the branch pipe is formed, the cock being rotatable in only one direction. A characteristic three-way stopcock. 2. A convex portion is provided on the outer circumference of the body portion, a concave portion is provided on the inner circumference of the cylindrical portion, and the convex portion has a saw blade shape that gradually decreases in the rotation direction. The three-way stopcock according to claim 1. 3. A convex portion is provided on the inner circumference of the cylindrical portion,
The three-way stopcock according to claim 1, wherein a concave portion is provided on an outer periphery of the body portion, and the convex portion has a saw blade shape that gradually decreases in a rotation direction. 4. The inside of the body portion where the flow paths meet has an arc shape along a circumference.
The three-way stopcock described in 3). 5. The three-way stopcock according to claim 1, wherein the main body and the cock are provided with rotation stoppers for preventing one rotation.