JP5257650B2 - Three-way stopcock - Google Patents

Description

  The present invention relates to a three-way cock which can selectively switch communication between a lead-out pipe and two introduction pipes.

  The three-way stopcock is used when performing drip in the medical field, and allows a chemical solution supplied from two introduction pipes to be supplied to one outlet pipe alternately or simultaneously. Conventionally, in this type of three-way cock, one outlet pipe and two inlet pipes extend outward from a cylindrical base. A columnar body is provided in the base so as to be liquid-tight and rotatable, and a T-shaped switching path is formed in the columnar body. Then, by rotating this cylindrical body, the lead-out pipe and each introduction pipe can be selectively communicated with each other via the switching path (for example, see Patent Document 1).

  More specifically, in the conventional three-way cock, as shown in FIG. 8A, each communication passage 11a, 11b, 11c of the T-shaped switching passage 11 formed in the columnar body 10 is replaced with a base portion 12. The three pipes 13, 14, and 15 are all in communication with each other by being matched with the first introduction pipe 13, the second introduction pipe 14, and the lead-out pipe 15 extending in the respective directions. In this state, for example, if the infusion chemical solution is supplied from the first introduction tube 13 and another chemical solution is injected from the second introduction tube 14, the infusion chemical solution and the other infusion chemical solution are mixed together from the outlet tube 15. Can be sent out.

  Further, as shown in FIG. 8B, the columnar body 10 is first extended linearly on both sides of the switching path 11 into a first introduction pipe 13 and a lead-out pipe 15 that extend linearly on both sides of the base portion 12. When the communication path 11a and the third communication path 11c are made to coincide with each other and the second communication path 11b is rotated to a position where the second communication path 11b is closed by the inner surface of the base portion 12, only the infusion chemical solution supplied from the first introduction pipe 13 is derived. It will be in the state sent out from the pipe | tube 15, and the 2nd introducing pipe 14 will be in a obstruction | occlusion state.

  Further, as shown in FIG. 8C, the columnar body 10 is connected to the second introduction pipe 14 and the lead-out pipe 15 extending in the orthogonal direction from the base portion 12, and the first communication path 11 a and the second communication path 11 of the switching path 11. When the third communication path 11c is rotated to a position where the communication path 11b is made to coincide with the inner surface of the base portion 12, only the injected drug solution from the second introduction pipe 14 is sent out from the lead-out pipe 15, and the first introduction pipe 13 is blocked.

  However, as shown in FIGS. 8B and 8C, only two of the tubes 13, 14, and 15 are communicated by the T-shaped switching path 11 formed in the cylindrical body 10. 8 (b), the second communication path 11b in the state shown in FIG. 8 (b), and the third communication path 11c in the state shown in FIG. 8 (c) becomes a closed space closed by the inner surface of the base 12, There was an inconvenience that the chemical solution 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. 8C, 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. Such administration errors 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 this invention is to provide the three-way cock which can reduce the retention of the chemical | medical solution in the switching path of a cylindrical body, and can suppress the administration error of a chemical | medical solution in view of the above point.

In order to achieve the above object, the present invention provides a cylindrical base, an outlet pipe extending from the outer peripheral surface of the base in a direction perpendicular to the axis of the base, and an axis of the outlet pipe from the outer peripheral surface of the base. A first introduction pipe extending in a direction opposite to the extension direction of the outlet pipe, and a second extension extending in a direction perpendicular to the respective axes of the base, the outlet pipe, and the first introduction pipe. An introduction pipe, and a cylindrical body provided in a liquid-tight and rotatable manner in the base, and the cylindrical body is provided with the outlet pipe, the first introduction pipe, and the second introduction pipe by the rotation. In the three-way stopcock in which a switching path for selectively communicating is formed, the switching path is a cylindrical body in a state where the outlet pipe, the first inlet pipe, and the second inlet pipe are all in communication with each other. L-shaped through-holes that are bent in an L-shape and communicate with the first introduction pipe and the second introduction pipe, It is constituted by a circumferential groove in communication with the extended by conductor decane conductor exit pipe side along the peripheral surface of the cylindrical body from one end side communicating with pipe, said outlet pipe, a first inlet, a second inlet tube and L-shaped through hole is characterized that you are on the same plane.

  According to such a configuration, the switching path is supplied from the first introduction pipe in the full state in which the switching path communicates all of the lead-out pipe, the first introduction pipe, and the second introduction pipe by the rotation of the cylindrical body. The chemical liquid flows through the L-shaped through hole and is mixed with the chemical liquid supplied from the second introduction pipe, and the mixed chemical liquid flows through the outer peripheral groove and is sent out from the outlet pipe.

  Further, in the linear communication state in which the cylindrical body is rotated 180 degrees from the full state, the switching path communicates only the first introduction pipe and the outlet pipe, and the second introduction pipe is closed by the outer peripheral surface of the cylindrical body. The chemical solution supplied from the first introduction pipe is sent out from the outlet pipe via the outer peripheral groove and the L-shaped through hole. For this reason, the closed space is not formed as in the prior art.

  Further, the cylindrical body is rotated so that one end of the L-shaped through hole communicating with the outer peripheral groove communicates with the outlet pipe, and the switching path communicates only the second inlet pipe and the outlet pipe. In the L-shaped communication state closed by the outer peripheral surface of the columnar body, a closed space is formed by the outer peripheral groove and the base inner peripheral surface.

  However, in the L-shaped communication state, the flow direction of the chemical solution supplied from the second introduction pipe is changed by the L-shaped through hole so as to bend from the axial direction of the second introduction pipe to the axial direction of the outlet pipe. Is sent out from the outlet pipe. The closed space defined by the outer peripheral groove and the base inner peripheral surface communicates with one end of the L-shaped through hole that communicates with the outlet tube. For this reason, the chemical | medical solution which flows into the axial direction of a derivation | leading-out pipe | tube does not flow easily into enclosed space.

  As described above, according to the present invention, the formation of the closed space is suppressed, and even when the closed space is formed, the chemical solution from the second introduction tube is difficult to flow in the closed space. In comparison, the retention of the chemical solution from the second introduction pipe in the switching path of the cylindrical body can be reduced, and the administration error of the chemical solution can be suppressed.

  By the way, when a valve body that is normally closed and opened by insertion of a connector such as a syringe inserted into the second introduction tube is provided at the distal end portion in the second introduction tube, the connection is made in a full state. There is a possibility that the chemical solution supplied from the tool to the second introduction pipe may remain in the second introduction pipe after the connection tool is pulled out from the second introduction pipe. In this case, if the switching path is configured in such a way that the opening surface communicating with the second introduction pipe of the L-shaped through hole is eccentric to the first introduction pipe side with respect to the central axis of the second introduction pipe. In addition, a chemical solution such as an infusion supplied from the first introduction tube flows from the first introduction tube side of the second introduction tube, and the chemical solution remaining in the second introduction tube is added to the second together with the chemical solution supplied from the first introduction tube. It is extruded from the lead-out pipe side of the introduction pipe into the outer peripheral groove of the cylindrical body. Thereby, it can administer to a patient, without leaving the chemical | medical solution which remained in the 2nd introductory tube.

  The communication surface that communicates with one end of the L-shaped through hole of the outer circumferential groove is a projection region in which the opening surface of the other end that communicates with the first introduction tube of the L-shaped through hole is projected in the axial direction of the first introduction tube. It is preferable that it is located outside.

  When the communication surface that communicates with the L-shaped through hole of the outer circumferential groove has a portion overlapping the projection region, a part of the chemical solution supplied from the other end of the L-shaped through hole is caused by the L-shaped communication hole. There is a possibility that the flow direction may flow directly to the outer circumferential groove without being changed by 90 degrees. In this case, in the L-shaped communication state, the chemical solution easily flows into the closed space defined by the outer peripheral groove and the base inner peripheral surface.

  As described above, if the communication surface is positioned outside the projection region, the flow of all the chemicals supplied from the other end of the L-shaped through hole is changed by 90 degrees by the L-shaped communication hole. Since it sends out from the end of a character-shaped through-hole, it can suppress more that a chemical | medical solution flows into the defined enclosed space.

  A first embodiment of the three-way cock according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the three-way cock 1 of the first embodiment includes a cylindrical base 2, a first introduction pipe 3, a second introduction pipe 4, and a lead-out pipe 5 that extend from the base 2 in three directions. ing. As shown in FIG. 2, the first introduction pipe 3 and the outlet pipe 5 extend on the same axis via the base 2, and the second introduction pipe 4 has a base portion as shown in FIGS. 1 and 3. 2 extends on an axis perpendicular to the axes of the first introduction pipe 3 and the lead-out pipe 5.

  As shown in FIGS. 1 and 2, a cylindrical body 7 having a T-shaped lever 6 at the top is inserted in the base 2 in a liquid-tight and rotatable manner. A switching path 8 is formed in the cylindrical body 7 as shown in FIG. As shown in FIGS. 2 and 4 (a), the switching path 8 has an L-shaped through hole 8a that is bent and penetrates the cylindrical body 7 in an L shape, and as shown in FIGS. 3 and 4 (a). And an outer peripheral groove 8b extending along the outer peripheral surface of the columnar body 7.

  As shown in FIGS. 2 and 4A to 4C, the L-shaped through hole 8a is bent and penetrated in an L-shape in a direction perpendicular to the axis of the cylindrical body 7, and the lever 6 Any one of the first introduction pipe 3, the second introduction pipe 4, and the lead-out pipe 5 can be selectively communicated by the rotation of the cylindrical body 7 accompanying the operation.

  Further, as shown in FIG. 4A, the outer peripheral groove 8b has an L-shaped through-hole at one end in a state where the L-shaped through-hole 8a communicates the first introduction pipe 3 and the second introduction pipe 4. It is formed along the outer peripheral surface of the columnar body 7 so as to communicate with one end of the side 8a communicating with the second introduction pipe 4 and the other end communicating with the outlet pipe 5.

  At this time, the communication surface that communicates with one end of the L-shaped through hole 8a of the outer circumferential groove 8b has the opening surface of the other end that communicates with the first introduction tube 3 of the L-shaped through hole in the axial direction of the first introduction tube 3 It is configured to be located outside the projection area projected onto the screen. 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 first embodiment will be described. First, as shown in FIG. 4A, the L-shaped through hole 8a of the columnar body 7 communicates with the first introduction tube 3 and the second introduction tube 4, and the outer peripheral groove 8b of the columnar body 7 is the first. 2 When the communication is in the full communication state with the introduction pipe 4 and the outlet pipe 5, for example, a chemical solution such as an infusion is introduced from the first introduction tube 3, and a syringe or the like is connected to the second introduction tube 4 to connect the other chemical solution Are injected, and the mixed chemicals are sent out from the outlet tube 5.

  When the columnar body 7 is rotated by 180 ° as shown in FIG. 4B by operating the lever 6 from this all-through state, the second introduction pipe 4 is closed by the outer peripheral surface of the columnar body 7, 1 The introduction pipe 3 and the lead-out pipe 5 are in a linear communication state where they communicate with each other through the outer peripheral groove 8b and the L-shaped through hole 8a. Thereby, a chemical solution such as a drip introduced from the first introduction pipe 3 flows through the outer circumferential groove 8b and the L-shaped through hole 8a and is led out from the lead-out pipe 5.

  Therefore, the switching path 8 of the columnar body 7 that closes the second introduction pipe 4 does not form a closed space (reference numeral 11b in FIG. 6B) as in the prior art. The chemical liquid does not stay in the switching path 8 of the columnar body 7.

  Further, from the state shown in FIG. 4A, when the cylindrical body 7 is rotated 90 ° counterclockwise as shown in FIG. 4C by operating the lever 6, the outer peripheral surface of the cylindrical body 7 The first introduction pipe 3 is closed, and the second introduction pipe 4 and the lead-out pipe 5 are in an L-shaped communication state where they communicate with each other through the L-shaped through hole 8a. At this time, a closed space is formed by the outer peripheral groove 8b and the inner peripheral surface of the base portion 2, but the chemical liquid injected from the second introduction tube 4 is in the axial direction of the second introduction tube 4 through the L-shaped through hole 8a. The flow direction is changed so as to be bent in the axial direction of the outlet pipe 5 from the outlet pipe 5 and sent out from the outlet pipe 5. The closed space defined by the outer peripheral groove 8b and the inner peripheral surface of the base portion 2 communicates with one end of the L-shaped through hole 8a on the side communicating with the outlet pipe 5. For this reason, it is difficult for the chemical liquid flowing in the axial direction of the outlet pipe 5 to flow into the closed space.

  As described above, according to the three-way cock 1 of the first embodiment, the formation of the closed space is suppressed, and even if the closed space is formed, the chemical liquid is difficult to flow into the closed space. In comparison, the retention of the chemical solution in the switching path 8 of the cylindrical body 7 can be reduced, and the administration error of the chemical solution can be suppressed. For this reason, for example, it can be satisfactorily adopted even for premature babies and infants with small weight.

  Further, the L-shaped through-hole 8a has both opening surfaces at a position where the lever 6 is at an angle of about 45 degrees with respect to the conduits 3, 4 and 5 as shown in FIGS. When rotated, it is formed so as not to communicate with any of the conduits 3, 4, 5 but to be blocked by the inner peripheral surface of the base 2. As a result, similar to the three-way stopcock in which the conventional T-shaped through hole is formed in the cylindrical body, the supply of the chemical solution from the outlet pipe 5 can be prevented only by tilting the lever 6. Can be maintained.

  In this case, for example, an uneven portion that is releasably engaged with the inner peripheral surface of the base portion 2 and the outer peripheral surface of the cylindrical body 7 is formed, and the uneven portion is connected to the conduits 3, 4, and 5. Thus, the lever 6 can be easily positioned if it is configured to be engaged when rotated to a position at an angle of about 45 degrees.

  Next, a second embodiment of the three-way cock according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated about the same structure as 1st Embodiment.

  In the second introduction pipe 4 ′ of the three-way cock 1 ′ of the second embodiment, a valve body R that is formed in a substantially cylindrical shape with an elastic body such as rubber and has a closed portion at the tip is provided. A slit Ra is provided in the closed portion of the valve body R, and is normally closed. When a connection tool such as a male luer part of a syringe (not shown) is inserted into the second introduction tube 4 ′, the closed portion of the valve body R is pushed inward at the tip of the connection tool, and the slit Ra is opened. Thereby, a chemical solution such as a syringe is supplied into the second introduction tube 4 ′.

  In addition, a switching path 8 is formed in the cylindrical body 7 of the second embodiment, and the switching path 8 is formed by bending the cylindrical body 7 into an L shape and penetrating through the L-shaped through hole 8a ′, and the cylindrical body. 7 and an outer peripheral groove 8b ′ extending along the outer peripheral surface.

  The L-shaped through-hole 8a ′ has an opening surface that communicates with the second introduction tube 4 ′ in a state where the first introduction tube 3 and the second introduction tube 4 ′ are in communication with each other. On the other hand, it is eccentric to the first introduction pipe 3 side.

  The outer peripheral groove 8b ′ has one end of the L-shaped through hole 8a ′ in communication with the first introduction pipe 3 and the second introduction pipe 4 ′. It is formed along the outer peripheral surface of the cylindrical body 7 so as to communicate with one end on the side communicating with 'and communicate with the outlet pipe 5 at the other end. Further, the outer peripheral groove 8b 'is formed so that the depth of one end side portion communicating with the L-shaped through hole 8a' is shallow.

  All other configurations are the same as those of the first embodiment. The operation of the three-way cock 1 'according to the second embodiment is also the same as that according to the first embodiment, and a description thereof will be omitted.

  According to the three-way stopcock 1 'of the second embodiment, in addition to the operational effects of the three-way stopcock 1 of the first embodiment, the connection tool such as the male luer part of the syringe is connected to the second introduction tube 4' in the full-through state. Even if the supplied chemical solution remains in the second introduction tube 4 ′ after the connector is removed from the second introduction tube 4 ′, the chemical solution such as an infusion supplied from the first introduction tube 3 is L-shaped. The chemical solution that flows in from the first introduction tube 3 side of the second introduction tube 4 ′ through the through-hole 8 a ′ and remains in the second introduction tube 4 ′ together with the chemical solution supplied from the first introduction tube 3 is added to the second introduction tube 3. The introduction pipe 4 ′ is pushed out from the outlet pipe 5 side into the outer circumferential groove 8 b ′ of the cylindrical body 7. Thereby, it is possible to administer the drug solution remaining in the second introduction tube 4 ′ to the patient without leaving it.

  Further, as shown in FIGS. 7A to 7D, the L-shaped through hole 8a ′ has a position where both opening surfaces thereof are inclined at an angle of about 45 degrees with respect to the conduits 3, 4 and 5 of the lever 6. When it is rotated, it is formed so as not to communicate with any of the conduits 3, 4, 5 but to be blocked by the inner peripheral surface of the base 2. As a result, similar to the three-way stopcock in which the conventional T-shaped through hole is formed in the cylindrical body, the supply of the chemical solution from the outlet pipe 5 can be prevented only by tilting the lever 6. Can be maintained.

  In this case, for example, an uneven portion that is releasably engaged with the inner peripheral surface of the base portion 2 and the outer peripheral surface of the cylindrical body 7 is formed, and the uneven portion is connected to the conduits 3, 4, and 5. Thus, the lever 6 can be easily positioned if it is configured to be engaged when rotated to a position at an angle of about 45 degrees.

The top view which shows 1st Embodiment of the three-way cock 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 cylindrical body in the three-way cock of 1st Embodiment. Sectional drawing which shows the state which stopped supply of the chemical | medical solution from the outlet tube of the three-way cock of 1st Embodiment. Explanatory sectional drawing which shows 2nd Embodiment of the three-way cock of this invention. Sectional drawing which shows the state which stopped supply of the chemical | medical solution from the outlet tube of the three-way cock of 2nd Embodiment. Explanatory sectional drawing which shows the conventional three-way cock.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 '... Three-way stopcock, 2 ... Base, 3 ... 1st introduction pipe, 4 ... 2nd introduction pipe, 5 ... Outlet pipe, 6 ... Lever, 7 ... Cylindrical body, 8 ... Switching path, 8a, 8a' ... L-shaped through-holes, 8b, 8b '... outer peripheral grooves, 9 ... indicated by arrows, R ... valve, Ra ... slits.

Claims (3)

A cylindrical base, an outlet pipe extending from the outer peripheral surface of the base in a direction perpendicular to the axis of the base, and an extending direction of the outlet pipe on the axis of the outlet pipe from the outer peripheral surface of the base Includes a first inlet pipe extending in the opposite direction, a second inlet pipe extending in a direction perpendicular to the respective axes of the base, the outlet pipe, and the first inlet pipe, and a liquid-tight and rotating inside the base. And a switching path for selectively communicating the lead-out pipe, the first introduction pipe, and the second introduction pipe by the rotation of the columnar body. In the three-way stopcock,
The switching path passes through the cylindrical body bent in an L shape in a fully-connected state in which the lead-out pipe, the first introduction pipe, and the second introduction pipe are all in communication with each other. An L-shaped through hole for communicating the pipe and the second introduction pipe, and the outlet pipe side along the outer peripheral surface of the cylindrical body from one end of the L-shaped through hole communicating with the second introduction pipe is constituted by a circumferential groove in communication with the conductor extraction pipe extends to the outlet pipe, the first inlet pipe, the second inlet tube and L-shaped through hole way characterized that you are on the same plane Stopcock. The three-way stopcock according to claim 1,
The distal end portion of the second introduction pipe is provided with a valve element that is normally closed and opened by insertion of a connector to be inserted into the second introduction pipe,
An opening surface of the L-shaped through hole that communicates with the second introduction pipe is eccentric to the first introduction pipe side with respect to the central axis of the second introduction pipe in the full passage state. Three-way stopcock.   The three-way cock according to claim 1 or 2, wherein the communication surface that communicates with one end of the L-shaped through hole of the outer circumferential groove in the full-passage state is the first introduction of the L-shaped through hole. A three-way stopcock, wherein an opening surface at the other end communicating with the tube is located outside a projection region projected in the axial direction of the first introduction tube.

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