JP5523003B2 - Medical stopcock - Google Patents

Description

  The present invention relates to a medical stopcock including a plurality of branch pipes connected to a plurality of medical tubes and the like, and capable of switching between communication and blocking states of the branch pipes.

  Conventionally, a predetermined medical solution or physiological saline is supplied into a patient's body using a plurality of medical tubes, or hemodialysis or blood transfusion is performed. In such a case, a medical stopcock is used. The medical tubes are communicated with each other or blocked (see, for example, Patent Document 1). This medical stopcock is composed of a main body, a support member, a switching member, and a seal portion. The main body has a configuration in which three connecting pipe portions communicating with each other through each flow path are formed on the outer periphery of the cylindrical portion having both ends opened, and the support member is configured by a cylindrical body fixed to one end side of the main body. Yes.

  The switching member has a configuration in which an operation part is provided at one end of a cylindrical part in which a switching channel corresponding to the channel of the main body is formed, and does not move in the axial direction but rotates. It is supported as you can. The seal member is formed of a rubber-like elastic cylinder formed with a flow path corresponding to the flow path of the main body, and is fixed to the support member and pressed against the main body and the switching member. In this medical stopcock, since the sealing function is exerted by the sealing member, it is only necessary to loosely fit the switching member to the main body, and thereby the rotation operation of the switching member can be lightened.

JP 2005-46349 A

  However, in the above-described conventional medical stopcock, even when the switching member is loosely fitted to the main body, the seal member is always in pressure contact with the main body and the switching member. Receive considerable resistance from Further, if the gap between the switching member and the sealing member is loosened, the sealing performance is lowered. Furthermore, the conventional medical stopcock has a problem in that the flow path is formed in the seal member and the shape thereof becomes complicated.

  This invention is made | formed in view of such a situation, The objective is to provide the medical stopcock which can improve a sealing performance and operativity with a simple structure.

In order to achieve the above-described object, the structural features of the medical stopcock according to the present invention include a plurality of branch pipes, and a cylindrical chamber portion provided with a plurality of communication holes respectively communicating with the plurality of branch pipes, It is installed in the chamber part so as to be rotatable around the axis, and a relay flow path is formed between the chamber part. By rotating, a plurality of communication holes are communicated with each other via the relay flow path. A medical stopcock provided with a switching plug capable of blocking at least one of the holes by the outer peripheral surface, between the chamber portion and the peripheral portion of the relay channel on the outer peripheral surface of the switching plug setting the seal portion for sealing only the seal portion, the thickness protrudes slightly toward the outer side than in the direction to cover the opening of the relay channel from the periphery of the relay passage distally from the periphery of the relay channel Flexibility that gets thinner as you go Lies in the fact that you configured in the example was ridge.

  In the medical stopcock of the present invention configured as described above, the seal portion is provided at the peripheral portion facing the chamber portion in the relay channel formed in the switching plug. Therefore, when the liquid flows in the relay flow path and a high pressure is applied, the seal portion is pressed against the chamber portion and exhibits excellent sealing performance, and when the high pressure is not applied in the relay flow path, the switching plug is easily rotated. This improves operability during switching. Further, since the seal portion is only formed at the peripheral portion of the relay flow path, the structure becomes simple.

Further, in the medical active plug according to the present invention, a seal, its thickness out collision slightly toward the outer side than in the direction to cover the opening of the relay channel periphery or we relay channel of relay channel It is constituted by collision conditions with going as thin and that flexibility distally from the periphery. In this case, it is preferable to keep the protrusions soft. According to this, when the inside of the relay flow path becomes a high pressure due to the liquid, the seal portion is more easily pressed against the chamber portion, and more excellent sealing performance is exhibited .

  Still another structural feature of the medical stopcock according to the present invention is that the switching plug and the seal portion are formed by integrally molding with a resin material. According to this, the change-over plug provided with the seal portion can have a simple structure and can be easily formed.

  In addition, another structural feature of the medical stopcock according to the present invention is that the switching plug is composed of a switching plug main body, a relay flow path forming portion that forms a relay flow path, and a seal portion, and is assembled to the switching plug main body. And the relay flow path forming member. In the present invention, the switching plug is configured by assembling a relay flow path forming member including a relay flow path forming portion and a seal portion that form the relay flow path to the switching plug main body. For this reason, even if the relay flow path and the seal portion have a complicated shape, the relay flow path and the seal portion can be molded as a relay flow path forming member that is separate from the switching plug main body, so that the molding becomes easy. .

  Still another structural feature of the medical stopcock according to the present invention is that a plurality of communication holes are formed of an upstream hole, an intermediate hole, and a downstream hole arranged along the direction around the axis when the switching plug rotates. Consists of three flow paths, and the relay flow path is located on the outer peripheral surface of the switching plug, and when the switching plug is positioned at a predetermined position in the direction of the axis in the chamber portion, one of the upstream hole and the downstream hole is intermediate That is, the first groove portion that communicates with the hole and the second groove portion that communicates the other of the upstream hole and the downstream hole and the junction branching portion are provided.

  According to this, it is possible to arbitrarily switch the communication and blocking states of the upstream hole, the intermediate hole, and the downstream hole provided in the medical stopcock.

It is the perspective view which showed the medical stopcock which concerns on 1st Embodiment of this invention. It is the top view which showed the medical stopcock. It is the front view which showed the medical stopcock. It is the left view which showed the medical stopcock. It is the right view which showed the medical stopcock. It is sectional drawing which showed the medical stopcock. It is a cutaway sectional view showing the inside of a medical stopcock. It is the perspective view which showed the switching stopper. It is the top view which showed the switching stopper. It is the cross-sectional view which showed the switching plug. It is 11-11 sectional drawing of FIG. The contact state of a chamber part and a switching plug is shown, (a) is a cross-sectional view, (b) is an enlarged view of the elliptical region shown in (a). It is the top view which showed the switch tap with which the medical stopcock which concerns on 2nd Embodiment of this invention is provided. It is a cross-sectional view of the switch tap shown in FIG. It is 15-15 sectional drawing of FIG.

(First embodiment)
Hereinafter, a medical stopcock according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show a medical stopcock A according to the embodiment, and this medical stopcock A is a stopcock body 10, a lid member 20, and a rubber attached to the stopcock body 10 via the lid member 20. It consists of a plug 25 and a switching operation plug 30. The stopcock main body 10 has a substantially cylindrical chamber portion 11 (hereinafter, FIG. 3 is a front view) and the vertical direction and the horizontal direction are described with reference to FIG. ), And orthogonal to the upstream branch pipe 12 and the downstream branch pipe 13 extending substantially along the same axis while maintaining an angle of 180 degrees on both the left and right sides of the chamber portion 11, and the upstream branch pipe 12 and the downstream branch pipe 13. The junction branch pipe 14 (see FIG. 6) provided at the upper portion of the chamber portion 11 is configured.

  The rear opening of the chamber 11 is closed with a cap member 15 as shown in FIGS. The cap member 15 has a flange-like shape protruding to the outer peripheral side at the peripheral edge of the rear opening of the stepped cylindrical body 15a whose front end face is closed and whose outer diameter on the rear side is larger than the outer diameter on the front side. It is formed in a shape provided with a locking portion 15b. The outer diameter of the locking portion 15 b is substantially equal to the outer diameter of the chamber portion 11, and the outer diameter of the large diameter portion of the stepped cylindrical body 15 a is slightly smaller than the inner diameter of the chamber portion 11. And the rear-end part of the switching operation plug 30 mentioned later is fitting between the outer peripheral surface of the stepped cylinder 15a and the inner peripheral surface of the chamber part 11.

  In addition, communication holes made up of three holes are formed at intervals of 90 degrees along the circumference in the approximate center in the axial direction of the chamber portion 11, and the upstream branch pipe 12 and the confluence are respectively connected to these communication holes. The flow paths formed inside the branch pipe 14 and the downstream branch pipe 13 communicate with each other. A communication hole (not shown) communicating with the upstream branch pipe 12 constitutes an upstream hole according to the present invention, and a communication hole 14a communicated with the junction branch pipe 14 constitutes an intermediate hole according to the present invention. A communication hole (not shown) communicating with the downstream branch pipe 13 constitutes a downstream hole according to the present invention.

  The diameter of the communication hole 14a that connects the junction branch pipe 14 and the chamber portion 11 is set to be larger than the diameters of the other communication holes. Further, on both sides in the left-right direction (the portion from the front side to the back side of the drawing in FIG. 6) of the inner wall of the communication hole 14a that communicates the chamber portion 11 and the merging branch pipe 14, the upstream branch pipe 12 and the downstream branch pipe 13 are connected. It is formed in a state in which a partition wall 16 that divides the facing channel forward and backward is stretched. The upper surface of the partition wall 16 is formed on an inclined surface 17 whose rear side is high and whose front side is low.

  The upstream branch pipe 12 is formed of a female luer connector formed integrally with the chamber portion 11, and a flow path including a hole portion is formed therein. A connecting screw portion 12 a is formed on the outer peripheral surface of the opening of the upstream branch pipe 12. The downstream branch pipe 13 is formed of a male luer connector formed integrally with the chamber portion 11, and a flow path including a hole portion is formed therein. Further, the distal end side portion of the downstream branch pipe 13 is constituted by a tapered male luer portion 13a. The merging branch pipe 14 is formed of a cylindrical portion having a short axial length provided in the upper portion of the chamber portion 11. The merging branch pipe 14 is connected to the merging branch pipe 14 with the merging branch pipe 14. A lid member 20 for fixing the rubber stopper 25 is attached.

  The lid member 20 is formed in a substantially cylindrical shape having different steps with different diameters. The upper part 21 is slightly smaller in diameter than the merging branch pipe 14 and the lower part 22 is substantially cap larger in diameter than the merging branch pipe 14. It is formed in a shape. The lid member 20 is detachably attached to the merging branch pipe 14 by engaging the inner peripheral surface of the lower end of the lower portion 22 with the outer peripheral surface of the merging branch pipe 14. In addition, a predetermined gap is formed at the upper portion of the engaging portion between the lower portion 22 of the lid member 20 and the branch pipe 14 for merging. This gap is used to fix the lower end of the rubber plug 25 to the lid member 20.

  The rubber plug 25 is made of an elastic member having elasticity such as natural rubber, synthetic rubber, or elastomer, and has a thick disk-shaped rubber plug main body 26 and a flange shape formed on the rubber plug main body 26. The engaging portion 27 and a substantially cylindrical fixing piece 28 formed at the lower portion of the rubber plug body 26 are configured. Then, as shown in FIG. 6, the rubber plug body 26 and the fixing piece 28 are pushed into the lid member 20 to engage the flange-like engagement portion 27 with the opening edge of the lid member 20, and the fixing piece The rubber plug 25 is fixed to the lid member 20 by sandwiching 28 between the lower portion 22 of the lid member 20 and the branch pipe 14 for merging.

  Further, the rubber plug 25 is provided with a slit 29 that penetrates between the inner side of the junction branch pipe 14 and the outer side of the lid member 20 and communicates the flow path in the junction branch pipe 14 to the outside. It has been. The slit 29 is closed by the elasticity of the rubber plug 25 when the flow path in the junction branch pipe 14 is not used. Moreover, when using the flow path in the junction branch pipe 14, for example, by inserting a male luer part of the syringe into the slit 29 of the rubber stopper 25, the chemical solution storage part of the syringe and the flow path of the junction branch pipe 14 You can communicate. At this time, the male luer part and the peripheral surface of the slit 29 are brought into a close contact state by the elasticity of the rubber plug 25.

  As shown in FIGS. 8 and 9, the switching operation plug 30 includes a substantially cylindrical switching plug 31 and an operation unit 32 connected to the front end of the switching plug 31. The change-over plug 31 is installed in the chamber portion 11 with the front end (rear end) inserted between the inner peripheral surface of the chamber portion 11 and the outer peripheral surface of the stepped cylindrical body 15a of the cap member 15. By rotating the operation portion 32, the operation portion 32 rotates smoothly in the direction around the axis of the chamber portion 11 when no high pressure is applied by a chemical solution or the like. Moreover, the groove part 33 which comprises the relay flow path of this invention is formed in the outer peripheral surface of the switching plug 31. FIG. The groove portion 33 is configured by a concave portion having a large width extending substantially half a circumference along the circumference at a portion slightly rearward of the axial center of the outer peripheral surface of the switching plug 31.

  A soft seal portion 35 is formed on the peripheral edge portion of the groove portion 33 on the outer peripheral surface of the switching plug 31. As shown in FIGS. 10 and 11, the seal portion 35 is configured by an annular protrusion whose thickness decreases from the peripheral edge portion of the groove portion 33 toward the distal end side, and the distal end side is an opening of the groove portion 33. It is formed so as to protrude slightly toward the outside from the direction of covering. The seal portion 35 has flexibility, and can be deflected both inside and further outside the groove portion 33 by applying a force.

  Further, on the outer peripheral surface of the switching plug 31, a groove portion 34 that forms the relay flow path of the present invention together with the groove portion 33 is formed side by side with the groove portion 33 in the axial direction. The groove portion 34 is formed in a circumferential groove portion 34a extending along the outer peripheral surface of the switching plug 31 in parallel with the groove portion 33 at a portion slightly ahead of the center in the axial direction on the outer peripheral surface of the switching plug 31, and a circumferential groove portion. It is comprised by the substantially L-shaped recessed part which consists of the axial direction groove part 34b bent from one edge part of 34a, and extending toward the rear side of an axial direction. The axial groove 34 b of the groove 34 is provided at a position spaced apart from one end of the groove 33, and the other end of the circumferential groove 34 a of the groove 34 is the other end of the groove 33. It is located in the one side (front side in FIG. 8) along the circumferential direction. Further, the width of the groove 34 is smaller than the width of the groove 33.

  The length along the circumferential direction of the switching plug 31 between the groove portion 33 and the groove portion 34 is set to be approximately equal to the substantially half circumference of the circumference, and the distance between the groove portion 33 and the circumferential groove portion 34a of the groove portion 34 and the groove portion 33 The distance between the groove 34 and the axial groove 34b is set substantially equal. A dam 36 along the outer peripheral surface of the switching plug 31 is formed between the groove 33 and the circumferential groove 34 a of the groove 34. In addition, the switching plug 31 installed in the chamber portion 11 has a communication hole for communicating the chamber portion 11 and the upstream branch pipe 12 at a portion where the groove portion 33 and the axial groove portion 34b of the groove portion 34 are formed on the outer peripheral surface. It will be in the state match | combined with the position of the communicating hole which connects the chamber part 11 and the downstream branch pipe 13. As shown in FIG.

  That is, the position of the portion where the groove portion 33 and the groove portion 34b of the groove portion 34 are formed in the axial direction of the switching plug 31 and the position of the portion of the chamber portion 11 where the two communication holes are formed coincide with each other. become. The switching plug 31 installed in the chamber 11 is in a state where the circumferential groove 34 a of the groove 34 is opposed to the front side portion of the inner peripheral surface of the chamber 11. That is, the position of the portion where the circumferential groove portion 34a of the groove portion 34 is formed in the axial direction of the switching plug 31 and the front side portion (the front portion of the inner peripheral surface of the chamber portion 11 than the portion where both communication holes are formed). Side) position matches.

  In addition, the portion where the dam portion 36 is formed on the outer peripheral surface of the switching plug 31 is in a position where it can face the inner surface front end side portion of the partition wall 16 on the inner peripheral surface of the chamber portion 11. For this reason, as shown in FIG. 7, when the switching plug 31 is positioned so that the dam portion 36 faces upward, the groove portion 33 flows in the upstream branch pipe 12 (located on the front side in FIG. 7). Opposite the path, the inside of the chamber 11 and the flow path of the upstream branch pipe 12 communicate with each other via the groove 33. Further, the rear side of the axial groove 34 b in the groove 34 (located on the back side of the groove 33 in FIG. 7) faces the flow path in the downstream branch pipe 13 and the inside of the chamber 11 and the downstream branch pipe 13. The flow path communicates with the channel 34.

  In this case, the partition wall 16 is positioned above the dam portion 36, and the upper surface of the dam portion 36 and the lower surface of the partition wall 16 are in contact with each other in a substantially tight contact state. Further, the seal portion 35 of the switching operation plug 30 is in pressure contact with the lower surface of the dam portion 36 and the inner peripheral surface of the chamber portion 11, and the peripheral portion of the groove portion 33 and the inner peripheral surface of the chamber portion 11 (including the lower surface of the dam portion 36). ). Since the space serving as the flow path of the merging branch pipe 14 is located above the partition wall 16, the groove 33 and the groove 34 communicate with each other via the flow path of the merging branch pipe 14. Therefore, in this state, a liquid such as a chemical solution can flow from the upstream branch pipe 12 to the downstream branch pipe 13 through the chamber portion 11 and the junction branch pipe 14.

  In this case, the flow path from the upstream branch pipe 12 to the downstream branch pipe 13 extends from the upstream branch pipe 12 to the upper rear side of the chamber portion 11 as shown by an arrow a in FIG. And extends to the front side of the chamber portion 11 from the lower side of the front portion of the chamber portion 11 to the downstream branch pipe 13. Further, when this flow path is shown based on the switching operation plug 30, as shown by an arrow b in FIG. 8, the chemical solution or the like flowing from the upstream branch pipe 12 into the groove portion 33 is separated from the upper partition wall 16 (arrow b) is moved to the groove 34.

  At this time, the inclined surface 17 formed on the upper surface of the partition wall 16 has a high rear side and a low front side, so that the chemical solution and the like pass through the space above the chamber portion 11, and the chamber portion 11. In addition, it is possible to suppress a part of air, a chemical solution, and the like from staying in the branch pipe 14 for merging. From this state, when the switching operation plug 30 is rotated in one direction so that the groove 33 faces the flow path of the downstream branch pipe 13 and the outer peripheral surface of the switching plug 31 faces the flow path of the upstream branch pipe 12, the chamber The portion 11 and the downstream branch pipe 13 communicate with each other, and the chamber portion 11 and the upstream branch pipe 12 are blocked. Also in this case, the seal portion 35 of the switching operation plug 30 is pressed against the inner peripheral surface of the chamber portion 11 and maintains a state where the gap between the peripheral portion of the groove portion 33 and the inner peripheral surface of the chamber portion 11 is sealed.

  Further, from the state of FIG. 6, the switching operation plug 30 is rotated in the other direction so that the one end side portion of the groove portion 33 is opposed to the flow path of the upstream branch pipe 12 and the communication state is maintained. When the outer peripheral surface of this is opposed to the flow path of the downstream branch pipe 13, the inside of the chamber portion 11 and the downstream branch pipe 13 are blocked, and the inside of the chamber portion 11 and the upstream branch pipe 12 communicate with each other. Also in this case, the seal portion 35 of the switching operation plug 30 is pressed against the inner peripheral surface of the chamber portion 11 and maintains a state where the gap between the peripheral portion of the groove portion 33 and the inner peripheral surface of the chamber portion 11 is sealed. Thus, by rotating the switching operation plug 30, both the upstream branch pipe 12 and the downstream branch pipe 13 are communicated with the chamber part 11, or only one is communicated with the chamber part 11. Can do.

  Meanwhile, as shown in FIG. 12, the space between the chamber portion 11 and the switching operation plug 30 is reliably sealed by the seal portion 35. FIG. 12 shows a state in which the groove portion 33 is opposed to the inner surface of the chamber portion 11, and when a chemical solution or the like is flowing in the groove portion 33, the seal portion 35 is stronger than the inner surface of the chamber portion 11 due to the liquid pressure of the chemical solution or the like. Press contact. Further, when the chemical liquid or the like does not flow and the hydraulic pressure in the groove 33 is low, the seal portion 35 is weakly pressed against the inner surface of the chamber portion 11.

  The operation unit 32 includes three operation pieces 32a, 32b, and 32c. The operation pieces 32a, 32b, and 32c correspond to the upstream branch pipe 12, the junction branch pipe 14, and the downstream branch pipe 13, respectively. As shown, the angle of 90 degrees is maintained. That is, as shown in FIG. 3, when the operation piece 32 a is at the upstream branch pipe 12, the operation piece 32 b is at the junction branch pipe 14, and the operation piece 32 c is at the downstream branch pipe 13, the upstream branch pipe 12, All of the junction branch pipe 14 and the downstream branch pipe 13 are in communication with each other via the chamber portion 11.

  Further, from the state of FIG. 3, when the operation portion 32 is rotated 90 degrees in the clockwise direction, the operation piece 32 b points to the upstream branch pipe 12 and the operation piece 32 c points to the junction branch pipe 14. The upstream branch pipe 12 and the junction branch pipe 14 communicate with each other, and the junction branch pipe 14 and the downstream branch pipe 13 are blocked. Further, from the state shown in FIG. 3, when the operation part 32 is rotated 90 degrees counterclockwise, the operation piece 32 a points to the merging branch pipe 14 and the operation piece 32 b points to the downstream branch pipe 13. The merging branch pipe 14 and the downstream branch pipe 13 communicate with each other, and the upstream branch pipe 12 and the merging branch pipe 14 are blocked.

  In addition, a chemical liquid injector (here, a syringe) such as a syringe can be detachably attached to the lid member 20 via a rubber plug 25. For this reason, while the upstream branch pipe 12 and the downstream branch pipe 13 are communicated with each other and the chemical liquid etc. flows from the upstream branch pipe 12 side toward the downstream branch pipe 13 side, other chemical liquids injected from the syringe into the chemical liquid etc. Can be mixed. Further, another chemical solution or the like can be flowed from the syringe to the downstream branch pipe 13 in a state where the inside of the chamber portion 11 and the upstream branch pipe 12 are blocked.

  In this configuration, when supplying two types of drug solutions into the body of a patient (not shown), first, a medical tube (in-dwelling needle connected to the downstream branch tube 13 for puncturing and placing the patient) Connect the rear end (not shown). Next, a male luer portion provided at the distal end portion of a medical tube extending from a container or the like that stores one chemical solution supplied to the patient is connected to the upstream branch pipe 12. Next, the male luer part of the syringe is passed through the slit 29 of the rubber stopper 25 while the other chemical liquid is sucked into the chemical liquid container of the syringe. And after passing one chemical | medical solution through the infusion line containing the chamber part 11 and discharge | releasing all the air in an infusion line outside, medicinal solution, such as a container, is punctured and indwelled in the patient's body. The chemical solution is supplied to the patient by feeding the patient toward the patient.

  In addition, the other chemical solution in the chemical solution storage portion of the syringe is also appropriately injected into the chamber portion 11 through the flow path of the junction branch pipe 14. At this time, the rubber plug body 26 is pushed downward by the male luer part of the syringe, and the lower surface of the rubber plug body 26 approaches the inclined surface 17 of the partition wall 16. For this reason, there is only a small space inside the chamber portion 11 and the junction branch pipe 14, and a place where a part of air or a chemical solution stays is difficult to occur inside the chamber portion 11 or the junction branch pipe 14. Become. This suppresses the propagation of bacteria inside. In addition, a part of the chemical solution does not stay inside the chamber portion 11 and the junction branch pipe 14.

  Further, since the space between the chamber portion 11 and the switching plug 31 is always sealed by the seal portion 35, the chemical solution fed into the groove portion 33 does not leak to other portions outside the predetermined flow path. Further, the operation of the operation unit 32 is usually performed in a state where supply of the chemical solution or the like is stopped. For this reason, when operating the operation part 32, the seal part 35 is weakly pressed against the inner surface of the chamber part 11, and the operability of the operation part 32 may deteriorate due to the presence of the seal part 35. Absent. That is, according to the present embodiment, when the chemical liquid is supplied into the groove portion 33, the sealing performance of the seal portion 35 is improved by the hydraulic pressure, and when the operation portion 32 is operated, the seal portion 35 becomes the chamber portion. Thus, the operability of the operation portion 32 is improved.

  Thus, in the medical stopcock A according to the present embodiment, the seal portion 35 is provided on the peripheral edge portion of the groove portion 33 formed in the switching operation plug 30. Therefore, when a chemical solution flows through the groove 33 and a high pressure is applied, the seal portion 35 is pressed against the inner peripheral surface of the chamber portion 11 and exhibits excellent sealing performance. Further, when the high pressure is not applied to the groove 33, the switching operation plug 30 can be easily rotated, and the operability of the operation unit 32 is improved. Further, since the seal portion 35 is only formed on the peripheral portion of the groove portion 33, the structure thereof is simplified.

  Further, since the seal portion 35 is configured by a soft protrusion having a flexibility that protrudes from the peripheral portion of the groove portion 33 and whose thickness decreases toward the tip side from the peripheral portion of the groove portion 33, the inside of the groove portion 33 is a chemical solution. As a result, when the pressure becomes high, the seal portion 35 is more easily brought into pressure contact with the inner peripheral surface of the chamber portion 11, and more excellent sealing performance is exhibited. Furthermore, since the seal portion 35 is formed integrally with the switching operation plug 30, the switching operation plug 30 provided with the seal portion 35 can have a simple structure and can be easily formed.

(Second Embodiment)
FIG. 13 shows a switching operation plug 40 provided in a medical stopcock according to a second embodiment of the present invention. The switching operation plug 40 has substantially the same shape as the switching operation plug 30 described above, and includes a substantially cylindrical switching plug 41 and an operation unit 42 connected to the front end of the switching plug 41. Yes. And in the outer peripheral surface of the switching plug 41, the two groove parts 43 and 44 which comprise the relay flow path of this invention are formed along with the axial direction. A seal portion 45 is formed at the peripheral portion of the groove portion 43 on the outer peripheral surface of the switching plug 41, and a seal portion 46 is formed at the peripheral portion of the groove portion 44.

  As shown in FIGS. 14 and 15, the seal portions 45 and 46 are configured by annular ridges whose thickness decreases toward the distal end side from the peripheral portions of the groove portions 43 and 44, respectively. The side is formed so as to protrude slightly outward from the direction covering the openings of the grooves 43 and 44. The seal portions 45 and 46 have flexibility, and can be bent to the inside and further to the outside of the grooves 43 and 44 when a force is applied. About the structure of the other part of the medical stopcock provided with this switching operation plug 40 and the switching operation plug 40, it is the same as the medical stopcock A mentioned above. Accordingly, the same parts are denoted by the same reference numerals and the description thereof is omitted.

  According to this stopcock for medical use, when high pressure is applied, for example, at the time of one-shot injection using a syringe or the like via the merging / branching pipe 14, the chemical solution fed into the groove portion 43 is moved to other portions that are out of the predetermined flow path. It is possible to prevent leakage, and it is also possible to prevent the chemical solution fed into the groove 44 from leaking to other portions that are out of the predetermined flow path. For this reason, a more reliable seal becomes possible. About the other effect of the medical stopcock provided with this switching operation stopper 40, it is the same as the medical stopcock A mentioned above.

(Third embodiment)
Although not shown, as a third embodiment according to the present invention, a relay flow path forming member in which the portion (surface layer portion) forming the groove portion 33 and the seal portion 35 in the switching operation plug 30 described above is integrated. In addition, it is possible to form a switching plug main body having a shape in which the portion corresponding to the groove portion 33 in the switching plug 31 is made one size larger, and the relay flow path forming member can be assembled to the switching plug main body. According to this, since a groove part and a seal | sticker part can be shape | molded as a relay flow path formation member which is a different body from a switching plug main body, the shaping | molding becomes easy. In addition, according to the present embodiment, the relay flow path forming member is made of a soft material such as polyether block amide, silicone, polypropylene, polyethylene, and the switching plug body is made of a hard material such as polycarbonate, polyoxymethylene, metal, and the like. Those with different materials and performance can be combined. About the other effect of this embodiment, it is the same as that of the medical stopcock A mentioned above.

  Similarly, in the switching operation plug 40 described above, the relay flow path forming member in which the portion forming the groove 43 and the seal portion 45 are integrated, and the relay flow path formation in which the portion forming the groove 44 and the seal portion 46 are integrated. It is also possible to form a switch plug main body having a shape in which the portions corresponding to the groove portions 43 and 44 in the switch plug 41 are made one size larger and to form two relay flow path forming members in the switch plug main body. Also by this, since a groove part and a seal | sticker part can be shape | molded as two relay flow path formation members which become a different body from a switching plug main body, the shaping | molding becomes easy. Also in this case, it is possible to combine those having different materials and performances such that the relay flow path forming member is made of a soft material and the switching plug body is made of a hard material. About the other effect of this embodiment, it is the same as that of the medical stopcock which concerns on 2nd Embodiment mentioned above.

  Moreover, the medical stopcock according to the present invention is not limited to the above-described embodiment, and can be modified as appropriate. For example, in the embodiment described above, the medical stopcock is a so-called three-way stopcock provided with three branch pipes. However, this medical stopcock is not limited to the three-way stopcock, and the upstream stop pipe and the downstream branch pipe It can also be configured with only two branch pipes. In addition, the relay flow path provided in the switching plug can be constituted not only by a groove provided in the outer peripheral surface of the switching plug but also by a through hole penetrating from one of the outer peripheral surfaces of the switching plug to the other. In the above-described embodiment, the upper surface of the partition wall 16 is configured by the inclined surface 17, but this surface may be configured by a flat surface instead of the inclined surface. Furthermore, other portions of the medical stopcock according to the present invention can be appropriately changed within the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 11 ... Chamber part, 12 ... Upstream branch pipe, 13 ... Downstream branch pipe, 14 ... Merge branch pipe, 14a ... Communication hole, 31, 41 ... Switching plug, 33, 34, 43, 44 ... Groove part, 35, 45, 46 ... seal part, A ... medical stopcock.

Claims (4)

A plurality of branch pipes, and a cylindrical chamber portion provided with a plurality of communication holes respectively communicating with the plurality of branch pipes;
It is installed in the chamber part so as to be rotatable around an axis, and a relay channel is formed between the chamber part, and the plurality of communication holes communicate with each other through the relay channel by rotating. A medical stopcock comprising a switching plug capable of blocking at least one of the plurality of communication holes by an outer peripheral surface,
Setting a seal for sealing between said relay channel the chamber portion to the peripheral portion of the outer peripheral surface of the switching 換栓,
The seal portion protrudes from the peripheral edge of the relay flow channel toward the outside a little more than the direction covering the opening of the relay flow channel, and the wall thickness decreases from the peripheral edge of the relay flow channel to the tip side. A medical stopcock comprising a flexible protrusion . The medical stopcock according to claim 1, wherein the switching plug and the seal portion are formed by integrally molding with a resin material. Said switching換栓, a switching換栓body, according to claim 1 which is constituted by a relay flow path forming member which is assembled to the switching換栓body consists of a relay flow path forming portion and the sealing portion forming the relay channel Medical stopcock. The plurality of communication holes are configured by three holes, an upstream hole, an intermediate hole, and a downstream hole, which are arranged along the direction around the axis when the switching plug rotates, and the relay flow path is formed by the switching plug. A first groove portion that communicates one of the upstream hole and the downstream hole and the intermediate hole when the switching plug is located at a predetermined position in the direction of the axis in the chamber portion, The medical stopcock according to any one of claims 1 to 3, comprising a second groove portion that communicates the other of the upstream hole and the downstream hole and the intermediate hole.

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