JP5782259B2 - Three-way stopcock - Google Patents

Description

  The present invention relates to a three-way cock which selectively switches the communication of three branch pipes.

  The three-way stopcock is used when performing drip in the medical field, and supplies a chemical solution or the like supplied from two branch pipes alternately or simultaneously to another one branch pipe. Conventionally, in this type of three-way cock, three branch pipes extend outward from the cylindrical base portion in the circumferential direction of the base portion at 90 ° intervals. A cylindrical valve body is provided in the base so as to be rotatable with the circumferential direction of the base as a rotational direction, and a T-shaped switching path is formed in the valve body. Then, by rotating this valve body, the branch pipes can be selectively communicated with each other via the switching path (for example, Patent Document 1 FIG. 4).

  In that case, both ends of the -portion of the T-shaped switching path ("T" is disassembled into "-" at the top and "I" at the top) are connected to the first branch pipe and the third branch pipe (at the base). It is assumed that the first, second, and third branch pipes are arranged in the circumferential direction in this order.), And the tip of the I portion of the T-shaped switching path is directed toward the blocking portion on the opposite side of the second branch pipe. In the rotation position, that is, in the switching position where only the liquid from the first branch pipe is supplied to the third branch pipe, the I portion of the switching path becomes a closed space (dead space). Inconvenience that the chemical solution or the like stays occurs (eg, Patent Document 2 FIG. 5B).

  The tip of the I portion of the T-shaped switching path is connected to the third branch pipe, one end of the-portion of the T-shaped switching path is connected to the second branch pipe, and the other end of the-portion of the T-shaped switching path is the second. In the rotation position directed to the closed portion opposite to the two branch pipes, that is, in the switching position where only the liquid from the second branch pipe is supplied to the third branch pipe, the other part of the switching path is provided. The end-side half becomes a closed space, and there is an inconvenience that a chemical solution or the like stays in the closed space (eg, Patent Document 2 FIG. 5 (c)).

  Patent Document 2 discloses a three-way cock for coping with this, and in this three-way cock, the switching path extends so as to half-circulate in the circumferential direction in a straight through hole that penetrates the valve body and one half-circumferential part of the valve body. Thus, at both ends, it is constituted by a semicircular groove communicating with both ends of the tube passage hole. In the three-way stopcock, the liquid passes through the half-circumferential groove at any switching position of the valve body, so that a closed space is not generated in the switching path (Patent Document 2 FIG. 4).

Japanese Utility Model Publication No. 6-44554 JP 2009-77879 A

  In the three-way cock of Patent Document 2, there is no liquid retention space in the switching path of the valve body, but the liquid supply from the second inlet pipe as the second branch pipe in FIG. There is a possibility that a part of the remaining liquid in the second introduction pipe may stay.

  An object of the present invention is to provide a three-way stopcock that can cause the liquid in the other inlet pipe to flow out to the outlet pipe when the liquid is sent from only one inlet pipe to the outlet pipe.

The present invention includes a cylindrical base portion, a columnar valve body rotatably provided in the base portion, and three pieces extending from the base portion in three directions at 90 ° intervals in the rotation direction of the valve body. A three-way stopcock in which a switching path for selectively communicating the branch pipes with each other by rotation of the valve body is provided. The three branch pipes are arranged in the direction of rotation of the valve body. The first introduction pipe, the lead-out pipe, and the second introduction pipe are sequentially formed, and the switching path includes a through hole that linearly penetrates the valve body, and a position of the valve body from the position of one end of the through hole. It is comprised by the surrounding groove extended in the surrounding part of the said valve body over the predetermined angle range to a rotation direction, and the said predetermined angle range has the both ends of the said through-hole as said 1st introduction pipe and said 2nd introduction pipe When both ends of the circumferential groove are in communication with either the first introduction pipe or the second introduction pipe, Characterized in that it is an angle range for communicating with the tube.

According to the present invention , at the switching position where the straight through hole is connected to the first and second introduction pipes at both ends, the one through hole of the valve body is linear in the liquid as the liquid in the first introduction pipe. Therefore, it passes through the through-hole while maintaining a predetermined momentum, flows sufficiently deeply into the second introduction pipe, and mixes with the other liquid in the second introduction pipe. Then, the mixed liquid flows into the outlet pipe through the circumferential groove of the valve body. Therefore, when the supply of the other liquid into the second introduction pipe is stopped, the other liquid in which one liquid remains in the second introduction pipe can flow out to the outlet pipe through the circumferential groove.

The top view of a three-way cock. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG. The cross-sectional view of the main part in the 1st switching position of a three-way cock. The cross-sectional view of the main part in the 2nd switching position of a three-way cock. The cross-sectional view of the main part in the 3rd switching position of a three-way cock.

  As shown in FIG. 1, the three-way cock 10 of the present embodiment includes a cylindrical base 12 and three branch pipes extending from the base 12 in three directions at intervals of 90 ° in the circumferential direction of the base 12. . These three branch pipes are a first introduction pipe 13, a lead-out pipe 14 and a second introduction pipe 15 in order counterclockwise in the plan view of the three-way cock 10 in FIG. The first introduction pipe 13 and the second introduction pipe 15 on the introduction side are female connector types, and the lead-out pipe 14 on the extraction side is a male connector type. The second introduction tube 15 incorporates a rubber valve, and the valve automatically opens and closes when the syringe is attached to and removed from the second introduction tube 15.

  As shown in FIGS. 1 and 2, the columnar valve body 17 includes a trifurcated lever 16 at an upper portion thereof, and is rotatably inserted into the base portion 12. The rotating direction of the valve body 17 is the same as the circumferential direction of the base portion 12.

  2 and 3, the switching path 18 is constituted by a through hole 18 a and a circumferential groove 18 b and is formed in the valve body 17. The through hole 18 a penetrates the valve body 17 with a straight line orthogonal to the center line of the valve body 17. The circumferential groove 18b extends to the circumference of the valve body 17 over a range of 90 ° in the rotation direction of the valve body 17, one end communicates with one end of the through hole 18a, and the other end rotates the valve body 17. The position is 90 ° apart from both ends of the through hole 18a in the moving direction. Typically, the through hole 18a has a circular cross section, and the circumferential groove 18b has a semicircular cross section. In addition, the distribution | circulation cross-sectional area of the through-hole 18a and the circumferential groove 18b can be suitably adjusted with the diameter of the through-hole 18a, and the depth and width | variety of the circumferential groove 18b.

  The valve body 17 rotates relative to the base 12 as the lever 16 is turned, and the first switching position (FIG. 4), the second switching position (FIG. 5), or the third switching position (FIG. 6). Is switched to. In addition, as shown in FIG. 1, each arm part 16a-16c of the trifurcated lever 16 is provided with the arrow display 19 which shows a communication direction on the upper surface.

  The state of the arrow display 19 in FIG. 1 indicates the first switching position (FIG. 4), and the first introduction pipe 13, the lead-out pipe 14 and the second introduction pipe 15 coincide with the direction of any one of the arrow displays 19. Yes. At the first switching position, the switching path 18 connects the first introduction pipe 13 and the second introduction pipe 15 to the outlet pipe 14 as shown in FIG.

  When the lever 16 is turned 90 ° counterclockwise from the state of the arrow display 19 in FIG. 1, the state of the arrow display 19 indicates the second switching position (FIG. 5), and the lead-out pipe 14 and the second introduction pipe 15 Is coincident with the direction of any arrow display 19, but the first introduction tube 13 does not coincide with the direction of any arrow display 19. In the second switching position, the switching path 18 connects the second inlet pipe 15 to the outlet pipe 14.

  When the lever 16 is rotated 90 ° clockwise from the state of the arrow display 19 in FIG. 1, the state of the arrow display 19 indicates the third switching position (FIG. 6), and the first introduction pipe 13 and the lead-out pipe 14 are Although the direction of any arrow display 19 coincides, the second introduction pipe 15 does not match the direction of any arrow display 19. In the second switching position, the switching path 18 connects the first inlet pipe 13 to the outlet pipe 14.

  The operation of the three-way cock 10 will be described. For example, a drug solution such as an infusion is introduced into the first introduction tube 13 through a flexible conduit, and the lead-out tube 14 is connected to a needle that pierces the vein of the human arm through the flexible conduit. 2 A syringe is connected to the introduction pipe 15 and another chemical solution in the syringe is introduced.

  At the first switching position of the three-way stopcock 10, as shown in FIG. 4, the through hole 18a of the switching path 18 communicates with the first introduction pipe 13 and the second introduction pipe 15, and the circumferential groove 18b of the switching path 18 leads out. The tube 14 communicates with the second introduction tube 15. The first chemical solution from the first introduction pipe 13 is introduced into the second introduction pipe 15 through the linear through hole 18a. At this time, the first chemical liquid is introduced into the second introduction pipe 15 while maintaining a sufficient momentum for the reason that the through-hole 18a is linear, and enters the second introduction pipe 15 deeply. And mixed with the second chemical solution from the second introduction tube 15. Then, a mixed chemical solution of the first and second chemical solutions flows into the outlet pipe 14 through the circumferential groove 18b. In the first switching position, there is no chemical liquid retention space (dead space) in the switching path 18.

  As the second chemical solution in the syringe runs out, the introduction of the second chemical solution from the syringe into the second introduction tube 15 stops. In contrast, the first chemical liquid continues to be introduced into the first introduction pipe 13 and enters the second introduction pipe 15 from the first introduction pipe 13 through the through hole 18 a of the lever 16. At this time, the first chemical liquid is introduced into the second introduction pipe 15 while maintaining a sufficient momentum for the reason that the through-hole 18a is linear, and enters the second introduction pipe 15 deeply. The remaining second chemical liquid is efficiently taken in and flows into the outlet pipe 14 via the circumferential groove 18b. Therefore, the second chemical liquid remaining in the second introduction pipe 15 flows to the outlet pipe 14 by the first chemical liquid, and the residual in the second introduction pipe 15 is prevented.

  At the second switching position of the three-way stopcock 10, as shown in FIG. 5, the first introduction pipe 13 is closed by the peripheral portion of the valve body 17, and the second introduction pipe 15 is interposed via the circumferential groove 18b and the through hole 18a. A communication state is established with the outlet pipe 14. Thereby, only the 2nd chemical | medical solution of the 2nd introductory pipe | tube 15 flows in into the derivation | leading-out pipe | tube 14 through the through-hole 18a from the circumferential groove 18b. At the second switching position, there is no chemical liquid retention space in the switching path 18.

  At the third switching position of the three-way stopcock 10, as shown in FIG. 6, the first introduction pipe 13 is in communication with the outlet pipe 14 via the circumferential groove 18b, and the second introduction pipe 15 is connected to the peripheral portion of the valve body 17. Closed. Thereby, only the 1st chemical | medical solution of the 1st introductory pipe | tube 13 flows in into the derivation | leading-out pipe | tube 14 through the circumferential groove 18b.

  When the syringe is removed at the first switching position, the rubber valve in the second introduction pipe 15 is automatically closed, the second chemical liquid flows out from the second introduction pipe 15, and thereafter, the first introduction is performed. Only the first chemical solution in the tube 13 is introduced into the outlet tube 14 through the through hole 18a, the second introduction tube 15 and the circumferential groove 18b. Thereafter, another syringe is attached to the second introduction tube 15 and the second liquid is not accurately left in the second introduction tube 15 even when the third switching position is set. Can be administered at a dose.

  As described above, according to the three-way cock 10 of the present embodiment, the switching path 18 of the valve body 17 includes the straight through hole 18a and the through hole 18a from one end of the through hole 18a in the rotational direction of the valve body 17. After the end of the supply of the second chemical liquid to the second introduction pipe 15, 2 The second chemical liquid that is to remain in the introduction pipe 15 can be smoothly removed from the second introduction pipe 15 by the first chemical liquid.

DESCRIPTION OF SYMBOLS 11 ... Three-way stopcock, 12 ... Base part, 13 ... 1st introduction pipe (branch pipe), 14 ... Outlet pipe (branch pipe), 15 ... 2nd introduction pipe (branch pipe), 17 ... Valve body, 18 ... Switching path, 18a ... Through hole, 18b ... Circumferential groove.

Claims (1)

A cylindrical base, a columnar valve body provided rotatably in the base, and three branch pipes extending in three directions from the base at 90 ° intervals in the rotational direction of the valve body In the three-way stopcock provided with a switching path that selectively connects the branch pipes to each other by rotation of the valve body,
The three branch pipes are a first introduction pipe, a lead-out pipe, and a second introduction pipe in order in the rotation direction of the valve body,
The switching path extends from the position of one end of the through hole in a straight line through the valve body to the periphery of the valve body over a predetermined angle range from the position to the rotation direction of the valve body. It is constituted by a circumferential groove being,
The predetermined angle range is such that when both end portions of the through hole are in communication with the first introduction tube and the second introduction tube, both end portions of the circumferential groove are the first introduction tube and the second introduction tube. A three-way stopcock having an angle range communicating with any one of the tubes and the outlet tube .

Images