JPH0842722A - Flow rate selector valve - Google Patents

Abstract

PURPOSE:To realize a flow rate selector valve usable as a flow rate switching type ventricle shunt. CONSTITUTION:A selector 20 having two passages 27a, 27b arranged with a space of 90 deg., the whole body of which is enclosed by an envelope 40 consisting of an elastic body (silicone rubber), is provided in such a manner as to be rotatable, and two counterflow preventing valves 45, 46 different in flow rate regulating quantity are interposed in passages 44a, 44b to rotate the selector 20 by 90 deg. by an external pressing force, whereby four kinds of flow rates including a flow rate of zero can be switched. A peritoneal cavity catheter and a ventricle catheter are respectively connected to an outflow port 43 and an inflow port 42, whereby a flow rate switching type ventricle shunt can be constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate switching valve,
Particularly, the present invention relates to a flow rate switching valve capable of switching the flow rate by a simple operation from the outside. It can also be used as a flow rate switching ventricular shunt.

[0002]

2. Description of the Related Art Conventionally, as a flow rate switching type ventricular shunt, for example, Japanese Patent Publication No. 2-8741 has been proposed. As shown in FIGS. The shunt A also has a function as a ventricular shunt for measuring intracranial pressure, and a thin tubular ventricular catheter 102 that can be inserted into the ventricle of a patient to discharge cerebrospinal fluid from the ventricle, An abdominal catheter or an atrial catheter (hereinafter referred to as “abdominal catheter”) 103 capable of delivering the cerebrospinal fluid to the abdominal cavity or atrium by inserting the tip into the abdominal cavity or atrium, and a proximal end portion 102a of the ventricular catheter 102. A shunt body (relay chamber) 101 made of a soft wall made of silicone resin or the like, which is connected to the proximal end portion 103a of the abdominal cavity catheter 103 and has a main passage 110 for communicating the catheters 102 and 103 with each other. Composed ing.

Further, the shunt body 101, the ventricular catheter 102 and the abdominal cavity catheter 103 are provided with a check valve 104 capable of preventing the reverse flow of the cerebrospinal fluid from the abdominal cavity catheter 103 to the ventricular catheter 102. The check valve 104 is a miter valve 106, 10 as a flow rate adjusting unit of the flow rate switching mechanism 105.
7 also has that function.

The shunt body 101 has a main passage 110 connecting to the above-mentioned ventricular catheter 102 and abdominal cavity catheter 103,
A small chamber-shaped reservoir 111 that is integrally formed so as to communicate with the ventricular catheter 102 side of the main passage 110 and the reservoir 11 of the main passage 110.
The branch portion 110a formed on the downstream side of 1 and the main passage 110
Of the abdominal cavity catheter 103, and a first flow path 113 and a second flow path 114 that connect the branch parts 110a and 110b in parallel with each other. There is. As shown by the chain line in FIG. 18, a suture thread or the like penetrating the suture through hole 115 may be sewn to the scalp 116 to fix it on the skull 117 under the scalp 116.

As shown in FIG. 18, in the first flow path 13, the flow rate in the communicating state of the first flow path 113 is a predetermined flow rate Q ₁
Miter valve 6 as a first flow rate adjusting unit that can be adjusted to
And a button-type on-off valve 108 as a first on-off valve capable of blocking the first flow path 113 by receiving a driving force from the outside of the shunt body 101.

In the second flow path 114, as shown in FIG.
From the outside of the shunt body 111 and the miter valve 117 as a second flow rate adjusting unit capable of adjusting the flow rate in the communication state of the second flow path 114 to a predetermined flow rate Q ₂ (here, = 1 / 2Q ₁ ). The second flow path 114 that can be blocked by the driving force of the second
A button-type on-off valve 119 as an on-off valve is inserted.

That is, in the flow channels 113 and 114 of the ventricular shunt A, from the ventricular catheter 102 to the abdominal catheter 113, the reservoir 111, the reservoir 111 and the miter valves 106 and 107 as the check valve 104. A pump chamber 131 for opening a shutoff valve and a button type shutoff valve 132, which are the above-mentioned on-off valves 108 and 109 as a shutoff valve mechanism 134 capable of shutting off the flow path 113, are sequentially arranged. .

The button type shutoff valve 132 is a shunt body 1
A valve chamber (vacant space) 132f communicating with the shutoff valve opening pump chamber 131 of 01 and communicating with the abdominal cavity catheter 103 side flow passage 113 through the opening 132e, and an upper wall surface of the valve chamber 132f are formed, and the finger 118 And the like, a flexible membrane 132a that can be recessed by an external force, a valve seat 132c formed around the opening 132e, and a flexible membrane 132a that is attached to the side wall surface of the valve chamber 132f of the flexible membrane 132a. It is configured as a push-type on-off valve having a protruding valve body 132b capable of closing the opening 132e when it is pressed downward. Incidentally, reference numeral 35 in the drawing indicates a connecting member.

This ventricular shunt A with a button-type cutoff mechanism
In order to operate the flow rate switching mechanism 105 and the shutoff valve mechanism 134 in the state where the button shutoff valve is buried in a predetermined position, as shown by the solid line in FIG. By pressing the membrane 132a, the protruding valve body 132b attached to the lower center of the flexible membrane 132a is formed into an intermediate partition membrane which is a valve seat 132c.
The opening 132e is closed by pushing it into the opening 132e of 132d.

To open the shut-off valve mechanism 134, as shown in FIG. 21, the upper flexible membrane 132a of the shut-off valve opening pump chamber 131 is pressed to reduce the pressure in the valve chamber 132f. By being raised, the valve body 132b is separated upward from the opening 132e, whereby the shutoff valve mechanism 134 is opened.

[0011]

By the way, in the conventional device as described above, the scalp 1 is moved by the finger 118 when switching the flow rate.
The operation is to push in the protruding valve body 132b of the button type shutoff valve 132 through 16, but when this protruding valve body 132b is pushed in, this acts as a strong pressing force on the skull, causing a strong pain. There is. An object of the present invention is to provide a flow rate switching valve that solves such problems. The flow rate switching valve of the present invention is not limited to the flow rate switching type ventricular shunt, and can be used as a general flow rate switching valve.

[0012]

In order to achieve the above-mentioned object, the invention according to claim 1 provides a flow rate switching valve, comprising:
A base plate, a selector fitted to the base plate in a vertically movable and rotatable manner from above, and a valve main body composed of a holder integrally and rotatably mounted on the upper surface of the selector,
A recess that encloses the valve main body inside, holds the substrate and the holder, and has an outer envelope having a fluid inflow port and a fluid outflow port, and communicates with the fluid inflow port in the selector. And a plurality of passages for allowing the fluid to flow out from the recess are formed at equal intervals, and a plurality of flow passages that can communicate with each of the passages at the same time and whose end portions communicate with the fluid outlet. Backflow prevention valves formed on the outer casing and having different flow rates are attached to each of the flow passages, and a selector rotation mechanism for rotating the selector by an operation from the outside of the outer casing is provided. It is characterized by that.

According to a second aspect of the invention, in the flow rate switching valve according to the first aspect, the selector rotating mechanism is
A cam surface formed on the substrate and a cam surface formed on the selector and opposed to the cam surface, and when the selector is pushed down via the holder, the cam surface formed on the selector is It is characterized in that the selector is rotated by moving along a cam surface formed on the substrate.

According to a third aspect of the present invention, in the flow rate switching valve according to the first or second aspect, an elastic member is provided for holding the selector and the holder at a position which is always upward from the substrate. It is characterized by

According to a fourth aspect of the present invention, in the flow rate switching valve according to the third aspect, the outer envelope body made of an elastic material constitutes the elastic member. According to a fifth aspect of the present invention, in the flow rate switching valve according to the first to fourth aspects, the selector and the holder are arranged in a process in which the selector and the holder restore to a top dead center by a restoring action of the elastic member. , A preliminary rotation means for rotating the selector to a preliminary rotation position for the next rotation operation is provided.

According to a sixth aspect of the present invention, in the flow rate switching valve according to the fifth aspect, the preliminary rotation means is a protrusion provided on the selector and a protrusion provided on the substrate, and the selector is moved upward. It is characterized in that it is composed of a guide protrusion having an inclined surface that is in sliding contact with the protrusion.

According to a seventh aspect of the present invention, in the flow rate switching valve according to any of the first to sixth aspects, a ventricular catheter is connected to the fluid inlet port and an abdominal cavity catheter is connected to the fluid outlet port. It is characterized by being connected to form a flow rate switching type ventricular shunt.

[0018]

In the above-described flow rate switching valve of the present invention, by pressing the holder from the outer side of the outer envelope and rotating the selector, a plurality of passages formed in the selector are formed in the outer envelope and are different from each other. A communication mode for a plurality of flow paths set to the flow rate is selected (switched),
The sum of the flow paths in the communication state is the flow rate. Further, since the pressing force of the holder is converted into the rotational force of the selector via the inclined surface of the cam formed on the selector and the inclined surface of the cam formed on the substrate, the force for pressing the skull is suppressed to the minimum.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flow rate switching valve as an embodiment of the present invention will be described below with reference to the drawings. FIG.
2 is a plan sectional view of the same, FIG. 3 is a plan view of the substrate, FIG. 4 is a view taken along arrow C of FIG. 3, FIG. 5 is a view taken along arrow D of FIG. 3, and FIG. 6 is taken along arrow AA of FIG. FIG. 7 is a sectional view, FIG. 7 is a side view of the selector, FIG. 8 is a plan view of the selector, FIG. 9 is a bottom view of the selector, FIG. 10 is an enlarged view of a G arrow portion of FIG. 9, and FIG. 11 is E of FIG.
-E arrow sectional view, FIG. 12 is a FF arrow sectional view of FIG.
Is a side view of the holder, FIG. 14 is a plan view of the holder, FIG. 15 is a bottom view of the holder, FIG. 16 is a side sectional view of the holder, and FIG. 17 is an enlarged view of an arrow J in FIG.

As shown in FIG. 1, the flow rate switching valve of this embodiment has a valve main body composed of a substrate 10, a selector 20 and a holder 30, and the valve main body is made of a soft material rich in elasticity.
It is wrapped inside an outer envelope 40 made of 41 (for example, silicone rubber). As shown in FIGS. 3 to 6, the substrate 10 has a disk-shaped base 11 having a flat bottom surface, and
A cylindrical portion 12 is erected at the center of the upper surface of the base 11. A hollow portion 13 is formed by vertically penetrating the cylindrical portion 12.

Reference numeral 11a denotes a plurality of (four in this embodiment) locking pieces projecting from the outer peripheral edge of the base 11 at equal intervals, and each of the locking pieces 11a is attached to the soft material 41 of the outer package 40. It is possible to prevent the base 11 from rotating due to the bite. On the upper surface of the base 11, four cam surfaces 14 of the same shape are formed at equal intervals. That is, on the upper surface of the base 11, a vertical surface 15 and an inclined surface 16 that extends obliquely upward from the lower end edge of the vertical surface 15 are continuously formed at 90 ° intervals (vertical surface 15 and The cam surface 14 is inclined with the inclined surface 16).

Further, four guide protrusions 17 having a substantially right triangle shape in a side view are provided at equal intervals above the cam surface 14 on the outer peripheral surface of the cylindrical portion 12. The guide protrusion 17 has a front sloped surface 18a and a rear sloped surface 18b which face downward, and the front sloped surface 18a.
Are opposed to the vertical surface 15 of the cam surface 14 and are projected on the outer circumference of the cylindrical portion 12 at every 90 ° so that the upper end edge of the inclined surface 18a is located substantially on the extension of the vertical surface 15. The inclined surface 18a is formed to have an inclination opposite to that of the inclined surface 16 of the cam surface 14. A rear inclined surface 18b is formed at the lower end of the front inclined surface 18a so as to be connected in an acute angle. The substrate 10 is formed by integrally molding the above-mentioned members of hard synthetic resin (nylon, Teflon, etc.).

Next, the selector 20 will be described. As shown in FIGS. 7 to 12, the selector 20 is composed of a body 21 formed of a hard synthetic resin material, which is the same material as that of the substrate 10, in a cylindrical shape as a whole.
A bottomed recess 21a is formed in which the cylindrical portion 12 of 11 can be fitted from above.

As shown in FIG. 1, the selector 20 is a substrate
It is assembled so that it can be fitted into the valve 10. At this time, an annular space is formed between the outer peripheral surface of the cylindrical portion 12 of the substrate 10 and the inner peripheral surface of the recess 21a of the selector 20, and this space is used as the fluid inlet 42 ( It will be described later in detail) and serves as a flow path for the main part of the switching valve. Bottom of body 21 (ie base of substrate 10)
Four cam surfaces 26 of the same shape are formed at equal intervals on the surface (opposed to the upper surface of 11).

The cam surface 26 has slanted surfaces 24 slidably engaged with the slanted surfaces 16 of the four cam surfaces 14 formed on the base 11 of the substrate 10 to rotate the body 21 by 90 °. 4 vertical planes 23 are formed on the bottom surface of the body 21 at 90 ° intervals, and four inclined planes are formed diagonally downward from the upper edge of each vertical plane 23. 24 are formed successively in sequence (the vertical surface 23 and the inclined surface 24 form a cam surface).
26, and the inclined surface 24 is formed at the same inclination angle as the inclined surface 16).

Further, each vertical surface 23 is formed on the inner peripheral surface of the recess 21a.
At each intersection with the lower edge of the, hemispherical projections 25,
It is slightly offset to the side of the inclined surface and is projected toward the inside. As shown in FIG. 9, this deviation amount is preferably 8 ° at the central angle. The hemispherical projections 25 are (each inclined surface of each guide projection 17 provided on the outer peripheral surface of the cylindrical portion 12 of the substrate 10).
18a, 18b), each of which is formed in a size capable of sliding contact with each other, and has a hemispherical projection 25 when the selector 20 moves upward.
Is to move along the front inclined surface 18a of the guide protrusion 17 to rotate the selector 20 slightly (preliminary rotation).

Two fluid passages 27a, 27b are formed which connect the inside of the bottomed recess 21a and the outer peripheral surface of the body 21,
Further, it penetrates the bottomed portion of the concave portion 21a, and the holder 30 described later.
A shaft hole 28 is formed so that a shaft 31 projecting therefrom can be rotatably fitted therein. As shown in FIGS. 13 to 17, the holder 30 is provided with a disc portion 32 as a main body, and a shaft 31 is projectingly provided at the center of the lower surface of the disc portion 32. Further, the outer peripheral edge of the disk portion 32 is 4
The individual locking pieces 32a are provided at equal intervals. The locking piece 32a has a function to prevent the holder 30 from rotating by being bitten into the soft material 41 of the outer package 40.

The shaft 31 is bisected by a slit 33 (see FIG. 13,
16 and 17), and retaining protrusions 34 project from the tip of each divided portion (see FIG. 17). In addition, the disk portion 32, the locking piece 32a, the shaft 31, and the retaining projection 34
Is integrally formed of hard synthetic resin (nylon, Teflon, etc.). Then, as shown in FIG. 1, a selector 20 is arranged on the substrate 10, and a holder is arranged on the selector 20.
30 is provided and the main body of the flow rate switching valve is assembled. The inclined surface 16 on the substrate 10 and the inclined surface on the selector 20
It is assembled so that 24 and the same inclination direction.

That is, the concave portion 21a formed in the central portion of the lower surface of the body 21 of the selector 20 is fitted into the cylindrical portion 12 provided upright in the central portion of the upper surface of the base 11 of the substrate 10 from above, and the substrate 10 is Assemble selector 20, then selector 20
A shaft 31 projecting from the center of the lower surface of the holder 30 is inserted into the shaft hole 28 from above, and the holder 30 is assembled to the selector 20.

Here, since the diameter of the shaft hole 28 and the diameter of the shaft 31 are formed to have substantially the same diameter, when the shaft 31 is strongly pushed into the shaft hole 28, the shaft 31 is deformed by the slit 33 to reduce its diameter. The retaining projection 34 passes through the shaft hole 28, and when the retaining projection 34 passes through the shaft hole 28, the shaft 31 is restored by elastic force.Therefore, after the shaft 31 is completely inserted into the shaft hole 28, the retaining protrusion 34 The horizontal upper edges of 34, 34 slidably engage the lower surface of the shaft hole 28 to prevent the holder 30 from coming off the selector 20, and
It is possible to obtain an assembly configuration in which the selector 20 and the holder 30 are rotatably coupled to each other while integrally integrating the 20 and the holder 30 in the vertical direction.

The outer diameters of the main parts of the substrate 10, the selector 20 and the holder 30 are formed in a circle having the same diameter. As shown in FIGS. 1 and 2, the main body of the flow rate switching valve assembled in this way is wrapped in an outer envelope body 40 made of a highly elastic soft material (for example, silicon rubber) 41.

At this time, the four locking pieces 11a projecting from the base 11 of the substrate 10 and the four locking pieces 32a projecting from the main body portion 22 of the holder 30 are made of the soft outer casing 40. Embedded in material 41, and also in holder 30 (holder 30 and selector
20 and the substrate 10 are integrally combined in the vertical direction).
Means that the cam surface 26 on the selector 20 and the cam surface 14 of the substrate 10 are separated from each other so as not to contact each other (maximum lift state), and are wrapped in the soft material 41 of the outer package 40. (State of FIG. 1). On one edge of the outer packet 40,
A fluid inlet 42 is formed and a fluid outlet is provided on the other edge.
43 is formed.

Inside the outer envelope body 40, at a position where the two passages 27a, 27b formed in the selector 20 can be communicated with at the same time,
Two flow paths 44a and 44b are formed, and a first check valve 45 and a second check valve 46 embedded inside the outer casing 40 are connected to each of the flow paths 44a and 44b. . The first check valve 45 and the second check valve 46 have different flow rates, and in this embodiment, the flow rate of the first check valve 45 is set to be larger than that of the second check valve 46. ing.

The outflow sides of both the check valves 46, 46 are open to a reservoir 47 formed inside the outer package 40 so as to communicate with the outlet 43. In the state of FIG. 1, the inflow port 42 communicates with the inside of the recess 21a of the selector 20, and the fluid flowing into the inflow port 42 flows into the recess 21a. With the above configuration, normally, the selector 20 and the substrate 10 are
The cam surface 26 and the cam surface 14 are held by the elasticity of the soft material 41 of the outer envelope body 40 at positions apart from each other so as not to contact each other (state of FIG. 1).

At this time, the fluid flowing from the inflow port 42 is
It flows into the recess 21 a of the selector 20. The state where the selector 20 is shown in FIG. 2, that is, the two passages 27 of the selector 20.
When a and 27b are in communication with the passages 44a and 44b, respectively, the fluid that has flowed into the recessed portion 21a is discharged from both check valves.
It flows out through the outlets 43 through 45 and 46. Therefore, at this time, the maximum flow rate will flow out.

When the selector 20 is rotated 90 ° clockwise from the state of FIG. 2 (rotation operation of the selector 20 will be described later), the passage 27b and the passage 44a communicate with each other, and at this time, the first check valve 45 is provided. Only the fluid that has passed through will flow out from the outlet 43. Therefore, at this time, the fluid having the second highest flow rate will flow out. When selector 20 rotates further clockwise, it passes.
Since neither 27a nor 27b is in communication with the passages 44a and 44b, the amount of fluid outflow from the outflow port 43 becomes zero.

Furthermore, when the selector 20 rotates clockwise, the passage 27a communicates with the passage 44b, and at this time, only the fluid passed by the second check valve 46 flows out from the outlet 43. Therefore, at this time, the fluid with the third highest flow rate will flow out. In this way, by rotating the selector 20 clockwise by 90 °, the maximum flow rate state, the second highest flow rate state, the third highest flow rate state, and the zero flow rate state,
The flow rate can be switched in 4 steps.

Next, the procedure for rotating the selector 20 clockwise by 90 ° will be described. Normally, as shown in FIG. 1, the selector 20 is held at a position distant from the substrate 10 and the flow rate of any one of the above four stages is obtained from the outlet 43. Here, when the holder 30 is pushed downward from the outside of the outer package 40, the selector 20 moves downward together with the holder 30.

[0039] As the selector 20 moves downward, the selector
The inclined surface 24 of the cam surface 26 of 20 is the inclined surface 16 of the cam surface 14 of the substrate 10.
The horizontal component force is generated by the pressing force, and this lateral component force becomes a relative rotational force between the selector 20 and the substrate 10. The substrate 10 is fixed to the outer casing 40 by the locking pieces 11a of the base 11, while the selector 20 is the holder 30.
Since it is rotatably attached to the selector 20 via the shaft 31, the relative rotation force generated between the selector 20 and the substrate 10 causes the selector 20 to rotate. The selector 20 is rotated until the vertical surface 23 of the cam surface 26 contacts the vertical surface 15 of the cam surface 14.

Since the cam surfaces 14 and 26 are formed on the substrate 10 and the selector 20 so as to have a spread of 90 °, the selector 20 moves 90 ° by the downward movement of the holder 30.
(To be exact, it is a little less than 90 °. Details will be described later.) It goes without saying that the rotation direction of the selector 20 can be selected by the inclination direction of the inclined surfaces 16 and 24 of the cam surfaces 14 and 26. Further, the cam surfaces 14 and 26 are disposed so as to face each other so that the inclined surfaces 16 and 24 are inclined in the same direction so that the above-described rotation can be performed.

After the selector 20 is rotated by approximately 90 ° and the pressing of the holder 30 is released, the holder 30 is moved to the selector 20.
At the same time, it moves upward due to the elastic restoring force of the soft material 41 of the outer envelope body 40, and automatically returns to the original state (state of FIG. 1). Then, at the time of restoration to the upper side, the following operation is automatically performed.

That is, when the selector 20 moves upward from the lowest point, the four hemispherical projections 25 projecting from the selector 20 at the final stage of the selector 20 are respectively formed in the cylindrical portion 12 of the substrate 10.
Front inclined surfaces of the four guide protrusions 17 protruding from the outer peripheral surface of the
Sliding contact with 18a. In this way selector 20
By the projection 25 being guided by the front side inclined surface 18a in the final stage of the ascending stroke, the selector 20 slightly rotates clockwise as the selector 20 moves upward. Therefore, when the selector 20 returns to the highest point shown in FIG.
Selector 20 is a little from the lowest point (eg about 8 °)
It rotates in the clockwise direction and stops at the preliminary rotation position for the next rotation operation.

That is, when the selector 20 is at the uppermost point, the vertical surface 23 of the cam surface 26 of the selector 20 is offset from the vertical surface 15 of the cam surface 14 of the substrate 10 by about 8 ° in the clockwise direction. Therefore, in the next rotation operation, the selector
When the 20 is pushed down, there is no possibility that the vertical surface 15 is located directly below the vertical surface 23, and when the selector 20 is pressed down,
There is no possibility that both vertical surfaces 23, 15 will contact each other and rotation of the selector 20 will be blocked. This way, the holder 30
Pushing on ensures a smooth rotation of the selector 20.

The above-described operation of preliminarily rotating the selector 20 clockwise by about 8 ° by the hemispherical projection 25 guided by the front inclined surface 17a of the guide projection 17 is performed when the selector 20 moves upward. It is performed only when 25 is at the position facing the front side inclined surface 17a.

However, for some reason, when the selector 20 moves upward, the protrusion 25 may be in a position facing the rearward inclined surface 17b of the guide protrusion 17. At this time, as the selector 20 moves upward, the projection 25 is guided by the rear inclined surface 17b, so that the selector 20 is rotated counterclockwise. However, in such a case, when the holder 30 is pressed again and the selector 20 is pressed down to rotate the selector 20 clockwise, and then the holder 30 is released, the normal operation as described above is performed and the selector 20 Can be pre-rotated about 8 ° clockwise.

The ventricular catheter 102 (see FIG. 18) is connected to the fluid inflow port 42 of the flow rate switching valve shown in FIGS. 1 and 2, and the abdominal cavity catheter 103 is connected to the fluid outflow port 43. A ventricular shunt is formed.

[0047]

As described in detail above, according to the flow rate switching valve of the present invention, the following effects and advantages can be obtained. (1) The flow rate can be switched by pressing the holder from the outside of the outer package and rotating the selector. (2) The pressing force of the holder is converted into the rotational force of the selector through the inclined surface of the cam formed on the selector and the inclined surface of the cam formed on the substrate, so the force pressing the switching valve is minimized. it can. (3) According to the above 2, in the case of a flow rate changeable ventricular shunt,
The force pressing the skull can be suppressed to a minimum, and the patient's pain during the flow rate switching operation can be eased. (4) No elastic body is required because the outer package has elastic force to restore the holder. (5) In the restoring process of the holder and the selector, since the selector and the holder are configured to rotate to the preliminary rotation position for the next rotation operation of the selector, it is possible to reliably rotate the selector by pushing the holder. .

[Brief description of drawings]

FIG. 1 is a side sectional view of a flow rate switching valve as an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a plan view of the substrate.

FIG. 4 is a view on arrow C of FIG.

5 is a view on arrow D of FIG.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a side view of the selector.

FIG. 8 is a plan view of the selector.

FIG. 9 is a bottom view of the selector.

FIG. 10 is an enlarged view of an arrow G in FIG. 9.

11 is a cross-sectional view taken along the line EE of FIG. 7.

12 is a cross-sectional view taken along the line FF of FIG.

FIG. 13 is a side view of the holder.

FIG. 14 is a plan view of the holder.

FIG. 15 is a bottom view of the holder.

16 is a cross-sectional view taken along the line HH of FIG.

FIG. 17 is an enlarged view of arrow J in FIG.

FIG. 18 is a plan view of a conventional flow rate switching type ventricular shunt.

19 is a cross-sectional view taken along the line KK of FIG.

FIG. 20 is a vertical sectional view for explaining the same operation.

FIG. 21 is a vertical sectional view for explaining the same operation.

[Explanation of symbols]

 10 Base plate 11 Base 12 Cylindrical part 13 Hollow part 14 Cam surface 15 Vertical surface 16 Inclined surface 17 Guide protrusion 18a Front inclined surface 18b Rear inclined surface 20 Selector 21 Body 21a Low recess 23 Vertical surface 24 Inclined surface 25 Hemispherical Protrusion 26 Cam surface 27a, 27b Fluid passage 28 Shaft hole 30 Holder 31 Shaft 32 Disc portion 33 Slit 34 Lock-out protrusion 40 Outer body 41 Soft material 42 Fluid inlet 43 Fluid outlet 44a, 44b Flow passage 45, 46 Anti-reflux valve 47 Reservoir 102 Ventricular catheter 103 Peritoneal catheter

Claims (7)

[Claims] 1. A valve main body in a flow rate switching valve, comprising a base plate, a selector fitted to the base plate so as to be vertically movable and rotatable, and a holder integrally and rotatably mounted on an upper surface of the selector. Part and an outer envelope body that encloses the valve main body part inside and holds the above-mentioned substrate and holder, and is formed with a fluid inflow port and a fluid outflow port, and in the selector and the fluid inflow port. A communicating recess and a plurality of passages for allowing the fluid to flow out from the recess are formed at equal intervals, and a plurality of passages that can communicate with the respective passages at the same time and whose end portions communicate with the fluid outlets are formed. A flow path is formed in the outer envelope body, and a check valve with a different flow rate is attached to each of the flow passages, and a selector for rotating the selector by an operation from the outside of the outer envelope body. A flow switching valve, which is characterized in that it is provided with a rotating mechanism. 2. The flow rate switching valve according to claim 1, wherein the selector rotation mechanism includes a cam surface formed on the substrate and a cam surface formed on the selector and arranged to face the cam surface. When the selector is pushed down via the holder, the cam surface formed on the selector moves along the cam surface formed on the substrate to rotate the selector. Flow rate switching valve characterized by. 3. The flow rate switching valve according to claim 1 or 2, further comprising an elastic member for holding the selector and the holder at a position which is always upward from the substrate. , Flow rate switching valve. 4. The flow rate switching valve according to claim 3, wherein the outer envelope body made of an elastic material constitutes the elastic member. 5. The flow rate switching valve according to any one of claims 1 to 4, wherein in the process of the selector and the holder returning to the top dead center by the restoring action of the elastic member, the selector and the holder are connected to the selector next time. A pre-rotation means for rotating the pre-rotation position to the pre-rotation position for the rotational operation of the flow rate switching valve. 6. The flow rate switching valve according to claim 5, wherein the preliminary rotation means is provided with a protrusion provided on the selector and an inclination which is provided on the substrate and slidably contacts the protrusion when the selector moves upward. A flow rate switching valve, characterized in that it comprises a guide projection having a surface. 7. The flow rate switching valve according to claim 1, wherein a ventricular catheter is connected to the fluid inlet port and an abdominal cavity catheter is connected to the fluid outlet port. A flow rate switching valve characterized by forming a chamber shunt.