WO2004101061A1

WO2004101061A1 - Flow passage switching device

Info

Publication number: WO2004101061A1
Application number: PCT/JP2003/006001
Authority: WO
Inventors: Takehiko Yuki; Raita Uematsu
Original assignee: Jms Co., Ltd.
Priority date: 2003-05-14
Filing date: 2003-05-14
Publication date: 2004-11-25
Also published as: AU2003234803A1; TW200423983A; TWI289067B; JP3719443B2; JPWO2004101061A1

Abstract

A flow passage switching device capable of increasing the substituting speed of chemicals mixedly filled in branch parts, wherein a first flow passage for connecting the first branch part to the third branch part of a device body and a second flow passage for connecting the second branch part to the third branch part are provided in the shaft part of a switching part so that, when the switching part where all branched parts are allowed to communicate with each other, fluid always flows in the switching part and the accumulation of the fluid in the switching part can be suppressed, and two first and second through-holes allowed to communicate with the inside of the third branch part are drilled, independently of each other, in a shaft holding part at positions which are opposed to the flow passage end of the first flow passage and the flow passage end of the second flow passage when the switching part is rotated to that position, whereby since the speed of the fluid flowing into the third branch part is increased, the substitution of the chemical mixedly filled in the third branch part can be promoted.

Description

Specification

TECHNICAL FIELD The present invention relates to a technique for promoting replacement of a fluid present inside one branch portion in a medical flow channel switching device having a plurality of branch portions. Background art

At present, in the field of medical instruments, for example, in order to inject a drug solution into a patient, a flow path switching device that is arranged between an infusion source and the patient and switches the flow path is used. As a flow path switching device, a stopcock provided with a plurality of branch portions serving as a fluid flow channel and a switching portion for switching a flow channel connecting the respective branch portions is known. Among them, a three-way stopcock having three branch portions is known. Stopcocks are widely used.

FIG. 5 is a cross-sectional view of a three-way cock according to the first related art.

As shown in the figure, the three-way stopcock includes a main body 800 and a switching section 8200, and the switching section 8200 is rotatably inserted into the main body 800.

The main body section 800 is composed of two first branch sections 80 1 and second branch sections 802 opposed to each other by 180 °, and these first branch sections 80 1 and second branch sections 80 2, respectively. A third branch portion 83 arranged at an angle of 90 °, and the three branch portions 81-803 are arranged in a T-shape.

A tube (not shown) connected to the infusion source is connected to the first branch portion 801, and a tube (not shown) connected to the patient is connected to the second branch portion 802.

The third branch portion 803 is for mixing a chemical solution into the three-way cock from the outside by a luer or the like, and is provided with a branch tube 804, a diaphragm 805, a cap 806, and a branch tube 8 The opening of No. 04 is sealed by a cap 806 via a diaphragm 805. Here, a slit 805a is provided in the diaphragm 805, and a hole 806a is formed in a portion of the cap 806 facing the slit 805a. The chemical is filled in the region A by inserting and injecting the tip of the lure filled therein through the hole 806a and the slit 805a into the inside of the branch pipe 804.

The switching section 820 has a T-shaped crossing flow for connecting the branch sections 801 to 803. A path 820a is formed, and a flow path connecting the branching sections 801 to 803 can be changed by rotating the switching section 820.

Here, when the switching unit 8200 is arranged at a position connecting the three branching units 8101, 8102, 8103 as shown in FIG. 5, the infusion supplied from the infusion source is Since the liquid flows substantially linearly from the first branch portion 8001 to the second branch portion 802, the chemical solution injected into the region A in the third branch portion 803 is hardly mixed with the flowing infusion solution, It is easy to remain. In such cases, it is not possible to administer the exact amount of the drug solution to the patient, and if this drug solution is of a high calorie suitable for bacterial culture, in region A, the drug solution becomes a hotbed where stagnation and bacteria grow. Could be.

In order to solve such a problem, there is a technique described in Japanese Patent Application Laid-Open No. 11-324209 (hereinafter, referred to as a second conventional technique).

FIG. 6 is a sectional view of a three-way stopcock according to a second conventional technique.

As shown in the figure, in the three-way cock according to the second conventional technique, an arc-groove-shaped flow path 9200a is formed along the circumferential surface of the switching section 9200, and further, a third branch section is formed. The region A formed in the third branch portion 903 as in the first related art is extremely small because the region 93 is formed short.

For this reason, if the tip of the lure S is inserted through the slit 905 a of the diaphragm 905 and a chemical solution is supplied therefrom, the chemical solution is directly supplied to the flow path 920 a. Therefore, the chemical liquid hardly stays in the area A, and even if the chemical liquid stays slightly, the infusion flowing from the first branch part 901 comes into contact with the chemical liquid mixed into the area A in the third branch part 903. After that, the chemical solution filled in the region A of the third branch portion 903 becomes easier to be replaced as compared with the above-described first prior art, and the bacteria grow. Can be suppressed.

Meanwhile, at the medical site, the injection of the chemical solution from the lure S attached to the three-way cock may be temporarily interrupted, and the switching section 920 may be rotated to switch the flow path. In this case, the switching unit 920 may be rotated while the lure S is inserted in order to save the trouble of removing the lure S each time. In this case, in the second prior art, since the region A of the third branch portion 93 is formed extremely small, when the switching portion 9220 is rotated with the lure S inserted, the lure S The leading end of the switch catches the flow path 920a of the switching section 920 and cannot rotate the switching section 920. In order to prevent this, as shown in FIG. 7, the third branch portion 903 may be lengthened to make the area A wider, and the end of the lure S may be prevented from contacting the switching portion 9200. Conceivable.

However, with such a configuration, in the three-way cock shown in FIG. 7, the area A at the tip angle of the area A is likely to be stagnant and is not easily replaced by the infusion flowing from the first branch portion 91. The replacement of the chemical may be partially delayed. In particular, when an infusion solution and a drug solution having different specific gravities are used, the replacement of the drug solution tends to be delayed. If the replacement of the co-injected drug solution is delayed in this way, it is necessary because the possibility of bacterial growth is increased and the co-injected drug solution from the third branch 903 may remain in region A. It is also likely that the patient will not receive an amount of drug.

In addition, at the current medical site, it is necessary to close the three branches at the same time when exchanging tubes, and at that time, the work of rotating the switching unit by 45 ° is generally performed. For example, in the case of the three-way stopcock shown in FIG. 5, by turning the switching part 82 0 by 45 ° (−45 °), the three branch parts 80 1 to 80 3 can be closed at the same time. .

However, in the three-way cock according to the second prior art, the flow path 9200a is formed along the circumferential surface of the switching section 9200, and the switching section 9200 is rotated to rotate the three-way stopcock. When the branches 91 to 903 are closed at the same time, it is considered that they cannot be closed unless they are rotated by 135 ° or 222 ° from the positions shown in FIGS.

Therefore, when using the second conventional technology, it is necessary to change the working method at the medical site, and there is a high possibility that the worker will be confused. Therefore, there is a need for a technique that can close all the branching parts by inclining the switching part by 45 ° and hasten the replacement of the co-injected drug solution. Disclosure of the invention

In view of the above problems, an object of the present invention is to provide a flow path switching device suitable for actual use in a medical field.

In order to achieve the above object, a flow path switching device according to the present invention includes a device main body having a configuration in which three branch paths are branched and extended from a hollow chamber, and a sliding body inserted into the hollow chamber. A fluid switching device that slides the sliding body in the device main body to simultaneously or alternatively switch the fluid flowing in from one branch to the other two branches and out of the two branches. When it is at a predetermined sliding position in the apparatus body, the first flow path communicates with the first branch path and the third branch path, and at the same time, the second flow path communicates with the second branch path. A first flow path and a second flow path, which are substantially separate paths, are respectively formed at positions that communicate with the third branch path, and the hollow chamber side opening of the third branch path is , And is characterized by being constituted by two independent through holes corresponding to the first and second flow paths. With such a configuration, when the infusion is supplied from the first branch and the chemical solution is supplied from the third branch, the infusion passes through the first flow path in the sliding body and is located on the hollow chamber side of the third branch. It is discharged toward the opening. This infusion enters into the third branch channel through one through hole provided at a position corresponding to the first channel, and is mixed with the drug solution filled therein. The mixed liquid passes through the second flow path through another through hole provided at a position corresponding to the second flow path, and is administered to the patient from the second branch.

Here, as in the second related art, when only one hollow chamber side opening of the third branch is opened, the first and second flow paths and the third branch are not opened. Flow of fluid such as an infusion through one through-hole between the first and second passages disrupts the flow of the fluid therethrough, and the flow velocity of the infusion that enters the third branch from the first flow path does not increase. However, stagnation may occur in the third branch road.

However, as in the present invention, if two independent through-holes are provided at the hollow-chamber-side opening of the third branch corresponding to the first and second flow paths, the case of one through-hole Since the area of the through-hole is smaller than that of, the pressure applied to the infusion increases, and the flow velocity of the fluid such as the infusion passing through the through-hole increases. Therefore, the infusion flows vigorously into the third branch portion, so that the stirring inside the third branch channel is promoted more than before, and the replacement speed of the chemical solution staying there can be improved. Also, if there are only two through holes, the roles of the inlet for the liquid to enter the inside of the third branch from the first flow path and the exit for the liquid to enter the second flow path from the inside of the third branch are shared. Therefore, it is considered that the flow velocity can be increased with the flow of the fluid inside the third branch channel in a fixed direction, and the replacement speed can be further improved. On the other hand, since the fluid always flows through the first flow path and the second flow path also in the sliding body, stagnation of the fluid inside the sliding body is suppressed. In this way, the stagnation of fluid inside and outside the sliding body is suppressed, thus suppressing the growth of bacteria. In addition to this, it is possible to administer an accurate amount of a drug solution to a patient, and it is possible to provide a flow path switching device suitable for practical use at a medical site. Furthermore, since the fluid can be prevented from staying inside and outside the sliding body, there is no need to insert a luer or the like into the sliding body to inject a chemical solution as in the second related art. Therefore, the flow path can be switched even while the lure is inserted, and the flow path switching device according to the present application is more suitable for actual use in a medical field than before.

In particular, in a state where the three branch paths are simultaneously communicated by the two flow paths on the slide body side, the two independent through holes face the opening of the first flow path. If the second through-hole is formed at a position facing the opening of the second flow path, the flow velocity of the fluid in the first and second through-holes can be further improved. It is considered that the replacement speed inside the third branch road can be further improved.

Here, as a specific flow path switching device, the hollow chamber is a cylindrical shaft holding portion, and the main body of the device is a first branch portion having a branch path formed on the outer periphery of the shaft holding portion. A circle in which a two-branch part and a third branch part are erected, and a sliding body is rotatably inserted into the shaft part holding part, and a first flow path and a second flow path are formed. It has a columnar shaft portion, and can be used as a stopcock that switches the flow path connecting each branch portion of the device main body by rotation of the shaft portion.

In particular, the flow path switching device is arranged such that the first branch portion and the second branch portion are opposed to each other on the outer periphery of the shaft portion holding portion, and the third branch portion is the first branch portion and the second branch portion on the outer periphery of the shaft portion holding portion. With a three-way stopcock located at 90 ° to the second branch, all the branches can be closed at the same time simply by rotating the slide by 45 °.

In addition, the third branch portion is formed of a branch pipe erected on the outer periphery of the shaft portion holding part and an elastic body fixed to the distal end of the branch pipe while being pressed, and formed with a slit capable of communicating with the inside of the branch pipe from the outside. If a partition wall is provided, the medicinal solution can be co-injected using a luer, so that a sharp needle is not required, and erroneous puncture by an operator can be prevented. As a specific configuration of the shaft portion, when the shaft portion is at the predetermined sliding position in the shaft portion holding portion, the opening of the first flow passage on the third branch portion side and the second flow passage A configuration in which a groove connecting the opening is formed is preferable.

Further, in the actual shaft portion, the first and second flow paths may be formed in an L-shape when viewed in plan. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a developed perspective view of a three-way cock.

FIG. 2A is a cross-sectional view of the three-way cock according to the present embodiment, and FIG. 2B is a cross-sectional view of the three-way cock when a single hole is provided in the main body.

FIG. 3 is a cross-sectional view of a three-way cock according to a modification of the present embodiment.

FIG. 4 is a sectional view of a three-way cock according to a modification of the present embodiment.

FIG. 7 is a sectional view of a three-way cock according to a modification of the second conventional technique. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment in which the flow path switching device according to the present invention is applied to a three-way cock will be described with reference to the drawings. The following embodiments and drawings of the present invention are examples of the embodiments of the present invention, and the present invention is not limited thereto.

(1) Three-way stopcock configuration

FIG. 1 is a developed perspective view of a three-way cock according to the present embodiment.

As shown in the figure, the three-way stopcock includes a switching unit 1 and a main unit 2, and a shaft 10 of the switching unit 1 is inserted into a shaft holding unit 20 of the main unit 2 and rotatably held. Have been. Here, the configuration of the main body 2 into which the switching unit 1 is inserted will be described first.

The main body 2 includes a hollow cylindrical shaft holding section 20 that holds the shaft 10 of the switching section 1, and a first branch section 21 that communicates with the shaft section holding section 20 and forms a branch path that forms a flow path in three directions. , A second branch 22, and a third branch 23.

The shaft holding portion 20 is a hollow chamber in which an insertion hole 20 a for inserting the columnar shaft 10 is formed, and an inner periphery of the insertion hole 20 a is provided. An engaging projection (not shown) that engages with the engaging groove 12 of the shaft 10 is formed in a circumferential shape.

The first branch portion 21 and the second branch portion 22 are formed of a cylindrical pipe having a flow path, are disposed opposite to each other on the outer peripheral surface of the shaft portion holding portion 20, and are formed in the shaft portion holding portion 20.揷 Stand up so as to communicate with the inlet hole 20a. Here, the first branch portion 21 has an An infusion tube connected to the liquid source is connected, and an infusion tube (not shown) connected to a patient is connected to the second branch 22.

The third branch section 23 includes a branch pipe 230 serving as a flow path, a cap holding section 231, a diaphragm 2 32, and a cap 2 33, for mixing and injecting a chemical solution from outside. It becomes a fork.

The branch pipe 230 is erected on the shaft holder 20 at an angle of 90 ° with the first branch 21 and the second branch 22 on the outer peripheral surface of the shaft holder 20. I have. Here, as shown in the enlarged view of FIG. 1, the inside of the shaft holding portion 20 in which the branch pipe 230 is provided, that is, the opening of the branch pipe 230 on the shaft holding portion 20 side. In the region, when the shaft 10 is inserted into a position where the branch portions 21, 22, and 23 communicate with each other, the flow end 13 1 b of the first flow passage 13 1 Through-holes 200a and 200b are formed at positions facing the flow path ends 132a of the flow paths 132 so as to correspond thereto. As a result, the inside of the branch pipe 230 communicates with the inside of the shaft holding section 20. In the three-way cock, the branch sections 21, 22, and 23 can communicate with each other. it can. The cap holding portion 231 is erected on the outer peripheral surface of the shaft portion holding portion 20 so as to surround the branch pipe 230, and a pair of engagement projections 231 0 (for holding the cap 233) is provided. Only one is shown in the figure.)

The diaphragm 232 is made of, for example, disc-shaped silicon rubber which is an elastic body having excellent chemical resistance, and a slit 233 a cut in the thickness direction is formed at the center thereof. ing.

The cap 2 33 has a pair of engaging portions 2 330 (only one is shown in FIG. 1) in which the engaging hole 2 330 a is formed, and the cap 2 33 is provided with the diaphragm 2 32 interposed therebetween. As a result, the engaging portion 233 is engaged with the engaging protrusion 231 of the cap holding portion 231 to be fixed to the cap holding portion 231. Here, the diaphragm 2 32 functions as a sealing material, and the inside of the branch pipe 230 maintains the airtightness with the outside of the main body 2. In addition, since the cap 2 33 presses the diaphragm 2 32, pressure is applied to the opposing surfaces of the slit 2 32 a, and the slit is closed. The cap 2 3 3 is provided with a guide hole 2 3 3 a that faces the slit 2 3 2 a of the diaphragm 2 3 2 and guides the tip of the lure, and the lure is guided through the guide hole 2 3 3 a. By inserting it, the branch tube is passed through the slit 23a in the diaphragm 23a. It is guided inside 230, and a chemical solution can be co-injected there.

On the other hand, the switching portion 1 has a cylindrical shaft portion 10 and a cross-shaped handle portion 1 formed integrally with an end of the shaft portion 10 for rotating the shaft portion 10 around its central axis. 1 and.

The shaft portion 10 has an engaging groove 12 formed circumferentially at a position on the outer peripheral surface thereof away from the handle portion 11, and is formed in the shaft portion holding portion 20 of the main body 2 (not shown). Engagement with the engagement projection allows the main body 2 to be rotatably fixed.

The shaft 10 communicates with the first branch 21, the second branch 22, and the third branch 23 of the main body 2, and a flow for passing a fluid such as an infusion solution or a drug solution. Road 13 is formed.

The flow path 13 includes a first flow path 13 0 and a second flow path 13 2 bent at a right angle, and a linear third flow path 13 1, and the third flow path 13 1 The first flow path 130 and the second flow path 132 are connected to form one flow path.

The first flow path 130 is formed when the shaft section 10 is rotated so that the flow path 13 is located at a position where all the branch sections 21, 22, and 23 communicate with each other. A flow path having an L-shape in plan view for communicating the flow path 23 with the first branch portion 21; a bent portion thereof is disposed near a central axis of the shaft portion 10; 30 a is exposed on the outer peripheral surface of the shaft portion 10, and the other channel end 13 Ob is disposed at a position recessed from the outer peripheral surface of the shaft portion 10.

The second flow path 13 2 is formed when the shaft 10 is rotated so that the flow path 13 is located at a position where all the branches 21, 22 and 23 are communicated. 3 is a flow passage for communicating with the second branch portion 2 2, and has an L-shape in plan view like the first flow passage 130, and its bent portion is the central axis of the shaft portion 10. 1 3

2a is arranged at a position recessed from the outer peripheral surface of the shaft portion 10 so as to communicate with the third flow passage 131, and the other flow end 1332b is arranged at the outer peripheral surface of the shaft portion 10 It is arranged to be exposed to the public.

The third flow path 13 1, on the outer peripheral surface of the shaft 10,

It is a groove that extends linearly from 3 Ob to the flow path end 1 3 2 a of the second flow path 1 32, and connects the first flow path 130 with the second flow path 1 32 Play a role. The third channel 13 1 rotates the switching unit 1 to a position 180 ° inverted from the position shown in FIG. Even if this is done, the first branch part 21 and the second branch part 22 can be communicated. Here, the flow path end 130 a of the first flow path 130 and the flow path end 132 b of the second flow path 132 are opposed in a plan view on the outer peripheral surface of the shaft portion 10. On the other hand, the flow path end 13 Ob in the first flow path 130 and the flow path end 13 2a in the second flow path 13 2 are arranged side by side up and down, and viewed in plan. Sometimes they overlap. That is, when the switching section 1 is viewed in a plan view, the flow path 13 is arranged in a T-shape as in the switching section described in the first conventional technique (see FIG. 2).

According to the above configuration, for example, when the infusion is caused to flow from the flow channel end 130a of the flow channel 130, as shown in the enlarged view of the extracted flow channel 13 in FIG. After passing through the channel 130, the channel end 130b enters the channel 131, and then the channel end 132a of the channel 13 enters the channel 132. It will flow out from the flow path end 1 3 2 b. Therefore, as long as the infusion is supplied from the infusion source, stagnation of the infusion and the like can be suppressed inside the flow path 13.

(2) Effect of using three-way cock according to the present embodiment

FIG. 2A is a cross-sectional view of a three-way cock according to the present embodiment, and FIG. 2B is a cross-sectional view of a three-way cock according to a comparative example.

As shown in the enlarged view of FIG. 2 (a), the three-way cock according to the present embodiment has the through holes 200 b, 200 a in the shaft holding portion 20, and the first flow path 130 0. Are provided independently at positions opposed to the flow path end 130b of the second flow path 13b and the flow path end 132a of the second flow path 132.

As a result, the infusion liquid flowing out from the flow path end 130b flows into the branch pipe 230 through the through-holes 200b.

To explain this, for example, as shown in FIG. 2 (b), a through hole 200 c communicating the first flow path 130, the second flow path 132, and the branch pipe 230 is formed. When only one is provided, the area is larger than the sum of the cross-sectional area of the first flow path 130 and the cross-sectional area of the second flow path 132. Therefore, in this case, the infusate flowing out from the flow path end 130b into the through hole 200c flows into the branch pipe 230 while diffusing. Also, the infusion flows from the branch pipe 230 to the flow path end 132a via the through hole 200c, so that the infusion flows in the through hole 200c while flowing in, and A reverse flow is formed. Therefore, the pressure applied to the infusion at the through-hole is lower than in Fig. 2 (a). It becomes. Therefore, it is considered that the infusion liquid flowing out from the flow path end 130b is more comfortable than the three-way cock according to the present embodiment and flows into the branch pipe 230. Therefore, there is a possibility that the substitution does not partially proceed inside the branch pipe 230.

On the other hand, in the three-way stopcock according to the present embodiment, two through holes 200a and 200b are provided, and each of the through holes has a unique role of inflow and outflow of a fluid. Fluid flow is less likely to be disturbed in the through holes. As a result, the velocity of the fluid passing through each through hole can be improved as compared with the case where there are only one through hole. Therefore, since the infusion liquid flows vigorously into the branch pipe 230, replacement of the co-injected drug solution is promoted.

Further, the positions where the through holes 200a and 200b face the flow path end 13〇b in the first flow path 130 and the flow path end 13 32a in the second flow path 132 In this case, the flow of the fluid is less likely to be disturbed and the pressure loss is reduced as compared with the case where both are displaced, so that the velocity of the fluid passing through the through holes 200 a and 200 b is It is further accelerated. Here, the area of the through holes 200a and 200b should be approximately the same as the flow area of each flow path 131, 133 and the opening area of the end 13lb, 13a. Is preferred. As described above, if the cross-sectional area of each of the through holes 200a and 200b is substantially the same as that of the flow path ends 132a and 130b, the pressure applied to the infusion is further increased, and the infusion is increased. It will pass through the through hole 200b vigorously and flow into the inside of the branch pipe 230.

Due to these effects, the drug solution injected into the branch pipe 230 by the lure S is mixed and replaced by the infusion fluid that flows vigorously through the through-hole 200b, and thereafter, the through-hole 2 It will flow out to the channel end 1 32 a through 00 a.

According to the three-way cock according to the present invention, the two through-holes 200a and 200b are independently provided, so that the infusion can be rushed into the inside of the branch pipe 230. As compared with the three-way cock shown in FIG. 2 (a) and the three-way cock described in the first and second prior arts, it is possible to replace the chemical solution mixedly injected into the third branch portion 23 faster. Furthermore, the role of the inlet and outlet of the infusion can be assigned to the two through holes 200a and 200b, so that the flow can be rectified into the branch pipe 230 into a flow in a certain direction. It is thought that the flow rate in 230 can be increased to promote the displacement.

In addition, the flow path 13 in the shaft 10 is configured so that the infusion always flows through the entire flow path. Therefore, as in the first related art, the flow path in the switching section is infused into the flow path 13 in the switching section. Also, there is no need to worry about the chemical solution remaining.

With such a configuration, even if the drug solution has a high calorie and is suitable for a bacterial culture medium, the drug solution is quickly replaced and the possibility of stagnation in the third branch 23 is lower than before, so that the Proliferation can be suppressed. Further, since the retention of the drug solution in the third branch portion 23 is reduced, a more accurate amount of the drug solution can be administered to the patient as compared with each conventional technique.

In addition, since the opening of the flow path 13 on the outer periphery of the shaft section 10 is only at three places of the flow path ends 130a, 130b (132a) and 132b, the shaft section 10 is rotated by 45 ° in FIG. 2 (a). By doing so, it is possible to close all of the first branch 21, the second branch 22, and the third branch 23. Therefore, all branches can be closed at the same time using the same usage method as the three-way cock commonly used in the medical field, and the unique operation method as in the second prior art is not required. .

(Modification)

In the above embodiment, the flow path end 130b of the first flow path 130 and the flow path end 132a of the second flow path 132 are formed at positions recessed from the outer periphery of the shaft portion 10, and the flow path 130b Although the third flow path 131 connects the road end 132a, the flow path ends 130b and 132a are formed at positions along the outer periphery of the shaft section 10 as shown in FIG. The flow path 131 may be eliminated, and the third flow path 131 may be provided instead on the inner circumference of the shaft portion holding section 20 on the side opposite to the third branch section 23. According to this, similarly to the above embodiment, even when the shaft 10 is rotated by 180 °, the infusion flows from the flow end 130 b of the shaft 10 to the flow end 131 a through the flow path 131. Because it flows, you can work using the same operation method as before. Further, since the flow path ends 130b, 132 & and the through holes 200013, 200a can directly communicate with each other without passing through the flow path 131, the infusion is diffused in the flow path 131 as in the above embodiment. As a result, the infusion can be made to flow vigorously into the branch pipe 230, and the replacement speed of the drug solution can be further improved as compared with the above embodiment.

Further, the third branch portion 23 may be simply an extension of the branch pipe 230, or may be a known co-injection port used in a flow path switching device.

Further, in the flow path switching device according to the present embodiment, the three-way cock has been described as an example. However, as shown in FIG. 4, a four-way cock having a fourth branch portion 24 provided at a position facing the third branch portion 23 in the shaft portion holding portion 20 can also be used. Similarly, the present invention can be applied to a flow path switching device having five or more branch portions.

Further, in the present embodiment, a liquid has been described as an example of the fluid that passes through the flow path. However, the same effects as those of the present invention can be obtained when passing a gas and a mixture thereof in addition to the liquid. it can.

Further, in the above-described embodiment, the second flow path 1332 is arranged on the first flow path 130 in the shaft portion 10. However, the first flow path 13 The vertical relationship with the two flow channels 1 32 may be reversed. Further, in the above-described embodiment, the through holes 200 a, 2 b are provided at positions opposed to the flow path ends 130 b, 132 in the first flow path 130 and the second flow path 132. Although 0 0 b was provided, if the through holes 200 a and 200 b are provided corresponding to the number of the flow path ends 13 O b and 13 32 a, the third branch portion The replacement efficiency of the solution in 23 may decrease, but it is not necessary to face each other.

Further, in the above embodiment, the first flow path 130 and the second flow path 13 2 have an L-shape in plan view. However, the present invention is not limited to this. If the positions are the same, the shape may be linear or three-dimensionally bent.

In the above embodiment, the first flow path 130 and the second flow path 132 in the shaft portion 10 are formed one by one. However, the present invention is not limited to this. You may make it form from two or more.

Further, in the above embodiment, the first flow path 130 and the second flow path 13 2 are formed completely independently and as separate paths. As long as the 30 and the second flow path 13 form substantially separate paths, a part of each flow path may slightly merge. INDUSTRIAL APPLICABILITY The channel switching device according to the present invention is particularly effective for a medical channel switching device.

Claims

The scope of the claims

1. The main body has a structure in which three branch paths are branched and extended from the hollow chamber, and a sliding body provided in the hollow chamber. By sliding the sliding body in the main body of the apparatus, one minute is obtained. A flow path switching device for simultaneously or alternatively switching the fluid flowing in from the crossroads to the remaining two branches and outflowing the same,

When the sliding body is at a predetermined sliding position in the apparatus main body, the first flow path communicates the first branch path and the third branch path, and the second flow path communicates with the second branch path. The first flow path and the second flow path, which are substantially separate paths, are respectively formed at the positions where the branch path and the third branch path communicate with each other,

The hollow-chamber-side opening of the third branch path is formed of two independent through holes corresponding to the first and second flow paths.

A flow path switching device characterized by the above-mentioned.

2. In a state in which the three branch paths are simultaneously communicated by the two flow paths on the slide body side, the two independent through holes have the first through hole as the opening of the first flow path. 2. The flow path switching device according to claim 1, wherein the second through hole is formed at a position facing the opening of the second flow path.

3. The hollow chamber is a cylindrical shaft holding section, and the apparatus main body includes a first branch section, a second branch section, and a third branch section having the branch path formed on the outer circumference of the shaft section holding section. Was erected,

The sliding body is rotatably inserted into the shaft holding portion, has a cylindrical shaft in which the first flow path and the second flow path are formed, and rotates the shaft. 3. The flow path switching device according to claim 2, wherein a flow path connecting the branch portions of the device main body is switched by a switch.

4. In the flow path switching device, each of the first branch portion and the second branch portion is disposed to face each other on the outer periphery of the shaft portion holding portion, and the third branch portion is provided on the outer periphery of the shaft portion holding portion. 4. The flow path switching device according to claim 3, wherein the stop switch is a three-way cock provided at a position 90 degrees from the first branch portion and the second branch portion.

5. The third branch portion has a branch pipe erected on the outer periphery of the shaft holding portion, and is fixed to a tip of the branch pipe in a state of being pressed, and a slit is formed that can communicate with the inside of the branch pipe from outside. 5. The flow path switching device according to claim 4, comprising a partition wall made of an elastic body.

6. The shaft portion, when it is at the predetermined sliding position in the shaft portion holding portion, a groove connecting the opening of the first flow passage and the opening of the second flow passage on the third branch portion side. The flow path switching device according to claim 4, wherein a flow passage is formed.

7. The flow path switching device according to claim 6, wherein the first and second flow paths are formed in an L shape when the respective flow paths are viewed in plan. .