JP2009077879A - Three-way cock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-way cock capable of preventing the stagnation of a liquid chemical in the switching path of a valve body and suppressing the administration error and concentration change of the liquid chemical. <P>SOLUTION: The three-way cock comprises a cylindrical base part 2, three branching pipes 3, 4 and 5 extending from the base part 2, and a columnar valve body 7 provided inside the base part 2. The valve body 7 is provided with the switching path 8 for selectively communicating the respective branching pipes with each other by the turning. The switching path 8 comprises a through-hole 8a passing through the valve body 7 and an outer peripheral groove 8b extended in a semicircular shape along one side of the peripheral wall of the valve body 7 from one end of the through-hole 8a to the other end to be freely communicated selectively to the respective branching pipes 3, 4 and 5 in the state of being communicated with the through-hole 8a. <P>COPYRIGHT: (C)2009,JPO&INPIT

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 a cylindrical base, and each branch pipe is separated from each other at an angle of 90 ° from the axis of the base. A cylindrical valve portion is rotatably provided in the base portion, and a T-shaped switching path is formed in the valve portion. By rotating this valve body, the branch pipes can be selectively communicated with each other via the switching path (see, for example, Patent Document 1).

  More specifically, in the conventional three-way cock, as shown in FIG. 5A, each communication passage 11 a, 11 b, 11 c of the T-shaped switching passage 11 formed in the valve portion 10 extends from the base portion 12. All three branch pipes 13, 14, 15 are brought into communication by matching with the branch pipes 13, 14, 15 in each direction. In this state, for example, if an infusion chemical solution is supplied from the first branch pipe 13 and another chemical solution is injected from the second branch tube 14, the infusion chemical solution and the other infusion chemical solution are merged to form the third Can be sent out from the branching path 15.

  In addition, as shown in FIG. 5B, the first branch line 13 that extends linearly on both sides of the base portion 12 and the first branch pipe 13 and the third branch pipe 15 that extend linearly on both sides of the base part 12 are linearly extended. When the passage 11a and the third communication passage 11c are made to coincide with each other and the second communication passage 11b is rotated to a position where it is closed by the inner surface of the base portion 12, only the infusion chemical solution supplied from the first branch pipe 13 is changed. Thus, the second branch pipe 14 is closed.

  Further, as shown in FIG. 5C, the first communication path 11 a and the second communication path of the switching path 11 are connected to the second branch pipe 14 and the third branch pipe 15 extending in the orthogonal direction from the base portion 12. 11b and when the third communication passage 11c is rotated to a position where it is closed by the inner surface of the base 12, only the injected drug solution from the second branch pipe 14 is sent out from the third branch passage 15, 1 branch pipe 13 is closed.

  However, as shown in FIGS. 5B and 5C, any two of the branch pipes 13, 14, and 15 are made to communicate with each other by the T-shaped switching path 11 formed in the valve portion 10. In this state, any one of the communication paths 11a, 11b, and 11c of the switching path 11, that is, the second communication path 11b and the state shown in FIG. 5 (c) in the state shown in FIG. 5 (b). Then, the 3rd communication path 11c became the obstruction | occlusion space obstruct | occluded by the inner surface of the base 12, and there existed a problem that a chemical | medical solution etc. stayed in this space.

For this reason, for example, when the chemical solution is injected from the second branch pipe 14 in the state shown in FIG. 5C, a part of the injected chemical solution stays inside the closed third communication passage 11c, There was an error in administering the drug solution to the patient. In addition, when the injected chemical solution stays in the third communication passage 11c shown in FIG. 5 (c) and is switched to the state shown in FIG. 5 (b), it stays in the third communication passage 11c. While the concentration of the injected drug solution is high, the drug solution supplied from the first branch pipe 13 is discharged from the third branch passage 15 at a stroke, and the concentration of the injected drug solution is rapidly changed in the drug solution for infusion. It was happening. Such administration errors and concentration changes of the drug solution may lead to a decrease in the therapeutic effect, particularly for premature infants and infants with a small weight.
Japanese Utility Model Publication No. 6-44554 (FIG. 4)

  An object of the present invention is to provide a three-way stopcock that eliminates such inconvenience and prevents the retention of the chemical solution in the switching path of the valve body, thereby suppressing the administration error and concentration change of the chemical solution.

  In order to achieve this object, the present invention includes a cylindrical base, three branch pipes extending from the base in three directions, and a columnar valve body rotatably provided in the base. In the three-way stopcock in which a switching path for selectively communicating the branch pipes with each other by rotation thereof is formed in the valve body, the switching path has a through-hole penetrating the valve body and one end of the through-hole. The other end communicates with the other end of the through hole and extends in a semicircular shape along one side of the peripheral wall of the valve body extending from one end of the through hole to the other end, and communicates with the through hole. It is characterized by comprising an outer peripheral groove that can selectively communicate with each branch pipe in a state.

  According to the present invention, since the switching path of the valve body is constituted by the through hole and the outer peripheral groove that are in communication with each other between the end portions, even if the through hole communicates with any branch pipe, The communication state between the through hole and the outer circumferential groove is maintained. As a result, when the flow of the chemical solution or the like is switched between the three branch pipes, even if any two branch pipes communicate with each other via the switching path, the switching path is blocked by the inner surface of the base portion. Therefore, the chemical solution or the like flows through both the through hole and the outer peripheral groove, so that the chemical solution can be prevented from staying in the switching path of the valve body.

  Furthermore, by forming a flow path cross-sectional area of each of the through hole and the outer peripheral groove to be half of the conventional switching path, for example, by flowing a chemical solution or the like through both the through hole and the outer peripheral groove, A flow rate equivalent to that of a conventional switching path can be ensured. In addition, in this way, by reducing the cross-sectional area of each of the through holes and the outer peripheral groove and ensuring a sufficient flow rate, it is possible to prevent the strength of the valve body from being reduced due to the provision of the switching path. It is possible to provide a highly durable three-way cock equipped with a high valve body.

  An embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of a three-way cock according to this embodiment, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. It is explanatory sectional drawing which shows the effect | action of a body.

  As shown in FIG. 1, the three-way cock 1 of the present embodiment includes a cylindrical base 2 and three branch pipes (a first introduction pipe 3, a second introduction pipe 4, and a lead-out pipe extending from the base 2 in three directions. 5). Of the three branch pipes, the first introduction pipe 3 and the lead-out pipe 5 are linearly extended 180 degrees apart from each other via the base 2 as shown in FIG. As shown in FIG. 1 and FIG. 3, the first introduction pipe 3 and the lead-out pipe 5 are extended through the base portion 2 so as to be 90 ° apart.

  As shown in FIGS. 1 and 2, a cylindrical valve body 7 having a lever 6 on the upper portion is rotatably inserted into the base 2. A switching path 8 is formed in the valve body 7 as shown in FIG. As shown in FIGS. 2 and 4 (a), the switching path 8 is formed along a through hole 8a that penetrates the valve body 7 and along the peripheral wall of the valve body 7 as shown in FIGS. 3 and 4 (a). It is comprised by the outer periphery groove | channel 8b extended in the semicircle shape.

  As shown in FIG. 2 and FIGS. 4A to 4C, the through hole 8a is formed so as to penetrate linearly in a direction perpendicular to the axis of the valve body 7, and the valve body accompanying the operation of the lever 6 7 rotates to communicate with any of the three branch pipes (the first introduction pipe 3, the second introduction pipe 4, and the outlet pipe 5) in the axial direction. Further, as shown in FIGS. 4A to 4C, the outer peripheral groove 8b communicates with both ends of the through hole 8a, and has three branch pipes (first introduction pipe 3, second introduction pipe 4, It communicates with either of the outlet pipes 5) from the side. As shown in FIG. 1, the lever 6 is provided with an arrow display 9 indicating the communication direction on the upper surface thereof.

  Next, the operation of the three-way cock 1 of the present embodiment will be described. First, as shown in FIG. 4A, the through hole 8 a of the valve body 7 communicates with the first introduction pipe 3 and the outlet pipe 5, and the outer peripheral groove 8 b of the valve body 7 communicates with the second introduction pipe 4. At this time, since the through-hole 8a and the outer peripheral groove 8b communicate with each other, the first introduction pipe 3, the second introduction pipe 4, and the outlet pipe 5 are all in communication. In this state, for example, a chemical solution such as an infusion is introduced from the first introduction tube 3, a syringe or the like is connected to the second introduction tube 4, and another chemical solution is injected. Derived.

  From this state, when the valve body 7 is rotated by 180 ° as shown in FIG. 4B by operating the lever 6, the second introduction pipe 4 is closed by the peripheral wall of the valve body 7, and the first introduction pipe 3. The lead-out pipe 5 is brought into communication with the through hole 8a. At this time, since both ends of the outer circumferential groove 8b communicate with the through hole 8a, the first introduction pipe 3 and the outlet pipe 5 are also in communication with each other through the outer circumferential groove 8b. Thereby, a chemical solution such as an infusion introduced from the first introduction pipe 3 flows through both the through hole 8a and the outer peripheral groove 8b and is led out from the lead-out pipe 5. Therefore, a closed space is not formed in the switching path 8 of the valve body 7 that closes the second introduction pipe 4 as in the prior art, and the retention of the chemical solution in the switching path 8 of the valve body 7 does not occur. It does not occur.

  Further, from the state shown in FIG. 4A, when the valve body 7 is turned 90 ° counterclockwise by the operation of the lever 6 as shown in FIG. The introduction pipe 3 is closed, and the second introduction pipe 4 and the lead-out pipe 5 are in communication with each other by a part of the outer peripheral groove 8b. At this time, since both ends of the outer peripheral groove 8b communicate with the through hole 8a, the second introduction pipe 4 and the outlet pipe 5 communicate with each other in a form detoured by the through hole 8a and the other part of the outer peripheral groove 8b. It becomes. Thereby, the chemical | medical solution inject | poured from the syringe etc. which were connected to the 2nd inlet tube 4 flows through both the through-hole 8a and the outer periphery groove | channel 8b, and is derived | led-out from the outlet tube 5. Therefore, a closed space is not formed in the switching path 8 of the valve body 7 that closes the first introduction pipe 3 as in the prior art, and the retention of the chemical solution in the switching path 8 of the valve body 7 does not occur. It does not occur.

  As described above, according to the three-way cock 1 of the present embodiment, the switching path 8 of the valve body 7 is constituted by the through hole 8a and the outer peripheral groove 8b, so that a space closed by the switching path 8 is formed. Since it is possible to prevent the retention of the chemical solution in the switching path 8, it is possible to prevent the administration error and concentration change of the chemical solution, and to adopt it well, for example, for premature infants and infants with a small weight. it can.

  Moreover, as shown in FIGS. 4B and 4C, even when either one of the first introduction pipe 3 and the second introduction pipe 4 is closed, the switching path 8 of the valve body 7 is switched. Since the chemical liquid flows through both the through hole 8a and the outer peripheral groove 8b, the chemical liquid is led out from the outlet pipe 5 at a sufficient flow rate even if the flow passage cross-sectional areas of the through hole 8a and the outer peripheral groove 8b are small. Can be made. From this, the flow path cross-sectional area of each of the through hole 8a and the outer peripheral groove 8b can be reduced and the switching path 8 is formed as long as it is within the predetermined flow rate range of the chemical liquid to be led out from the outlet pipe 5. It is possible to improve the durability of the three-way stopcock 1 by suppressing the strength reduction of the valve body 7 due to the above.

The top view of the three-way cock of one Embodiment of this invention. II-II sectional view taken on the line of FIG. III-III sectional view taken on the line of FIG. Explanatory sectional drawing which shows the effect | action of the valve body in the three-way cock of this embodiment. Explanatory sectional drawing which shows the valve body in the conventional three-way cock.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Three-way cock, 2 ... Base part, 3 ... 1st introduction pipe (branch pipe), 4 ... 2nd introduction pipe (branch pipe), 5 ... Outlet pipe (branch pipe), 7 ... Valve body, 8 ... Switching path, 8a ... through hole, 8b ... outer peripheral groove.

Claims (1)

A cylindrical base portion, three branch pipes extending in three directions from the base portion, and a columnar valve body rotatably provided in the base portion, each of which is branched by the rotation of the valve body. In the three-way stopcock formed with a switching path to selectively communicate between the tubes,
The switching path includes a through hole penetrating the valve body, a valve body extending from one end of the through hole to the other end with one end communicating with one end of the through hole and the other end communicating with the other end of the through hole. A three-way stopcock, comprising a semicircular shape extending along one side of a peripheral wall, and an outer peripheral groove selectively communicating with each branch pipe in communication with the through hole.