JPS62266074A - Flow control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] ■9 Background of the invention Technical field FIELD OF THE INVENTION The present invention relates to flow control devices.

More specifically, the present invention relates to a flow control device suitable for use in a measurement system for surface liquid dynamic pressure such as surface pressure.

Prior art In the measurement of blood pressure, etc., a catheter is usually inserted into a blood vessel at the blood pressure measurement site of a patient, and this catheter is filled with a sterile neutral solution, such as physiological saline. In this case, if blood flows into the catheter from the inner end of the catheter, there is a risk that the blood may coagulate, so to avoid this, the neutral solution is poured at a very slow rate, usually 32"/hr. It is necessary to inject fluid into the affected area through the catheter.Then, by monitoring changes in the pressure of the fluid inside the catheter, the blood pressure, blood flow, etc. at the inner end of the catheter can be adjusted. You can get 11 different kinds of useful data.

The neutral solution is supplied from a container into a blood vessel using a pressure difference through a catheter, but in order to provide such a very slow flow rate, a cylinder with a capillary hole in the middle is usually used. By setting (J), a predetermined flow rate is given to the flow through the capillary.And, since this flow rate is affected by the flow resistance of the capillary, the capillary, in other words, the cylinder requires a certain degree of goodness sufficient to provide a given flow resistance.

When using such catheters, the catheter must be completely free of all air which, if introduced into the body, would have a detrimental effect on the patient. To remove air within the catheter, the solution is used for priming and the catheter is filled with the solution.

However, this method of reducing the flow rate to a very low rate requires too much space between parts, so in order to perform this kind of brimming in a short time, it is necessary to reduce the flow rate significantly when removing air and filling the solution. A flow control fl device has been proposed to enable the method to be carried out.

Such a flow IIJI [l device, for example) l
There are some that are equipped with a safety valve (U.S. Patent No. 3,
675,891@Details m), this device had the disadvantage that it was inconvenient because it required both hands to operate and cover the rubber handle to perform high-speed distribution.

Further, a housing having a passage provided with an inlet/outlet therein, a valve seat provided in the passage, and a valve seat provided in the passage to be elastically actuated and freely engageable with the valve C seat;
When the plunger is engaged with the valve seat, a marine bore type cylinder is inserted through the valve plunger to define a low-velocity flow path for liquid from the inlet to the outlet. A flow control device is proposed comprising a capillary tube and means for disengaging the valve plunger from the valve seat to define a high flow path of liquid from the inlet through the valve plunger to the outlet. (Japanese Unexamined Patent Publication No. 8,033/1983). However, such a device has a complicated structure and a large number of parts, making it expensive, and also has the disadvantage that it is difficult to bleed air from inside the IAI.

Furthermore, an elastically deformable dupe having a non-circular outer periphery having a load concentration area, a protective housing extending around the periphery, a means for preventing rotation of the dupe provided on the housing, and a means for preventing rotation of the dupe provided on the housing; It consists of a flow rate regulating member with capillary pores, and a hollow connector inserted into the duplex so as to sandwich the flow regulating member in the tube at both ends, and the load on the outside of both ends of the flow regulating member is A portion of the concentrated area side is cut off to form a cavity that communicates with the inside of the hollow connector, and by suppressing the housing during high-speed flow, the frame within the housing can be elastically deformed around the non-circular outer periphery. A flow control device has been proposed in which a duplex is pressed and deformed, and a gap is created between a flow rate regulating member and the die, and the hollow portions communicate with each other to form a bypass (U.S. Patent No. 4.464.17C
1 Ming tfA). However, such i! I positioning is not only expensive due to its complicated structure, but also twists the elastic tube, which may prevent it from returning to its original state. Furthermore, in order to form a bypass that communicates between both cavities by deforming the elastic duplex, it is necessary to form a gap that is longer than the length of the flow regulating member between the duplex and the flow regulating member. There were problems in that it required a large deformation force and was extremely difficult to form a sea urchin in which the voids in A had the same cross-sectional area over the entire length.

(6) Objectives of the Invention Accordingly, an object of the present invention is to provide a novel flow control device. Another object of the present invention is to provide a flow control device suitable for use in a system for measuring hemodynamic n° such as blood pressure.

Still another object of the present invention is to provide a flow control device that is simple to construct and extremely easy to operate.

These ports include an elastically deformable tubular body equipped with a liquid inlet and a liquid outlet, and at least one tube inserted into the tubular body and communicating with the liquid inlet and the liquid outlet. A cylindrical liquid flow regulating member having a capillary tube, and
C at least two recesses partially formed on the inner surface of the tubular body and not connected to the tubular body; It consists of a housing including the tubular body by a pressing member that can be compressed in a direction substantially perpendicular to the axial direction of the body, and when the pressing member is pressed, only the tubular body is deformed and the tubular body is This is achieved by a flow control device characterized in that a gap is formed between the flow control member and the recess to communicate with the flow control member.

Further, the present invention provides that the pressing member holds the tubular body between the V
The flow control device has a right-handed cross-sectional shape and is integrally formed with the housing. Further, the present invention is a flow control device in which the tubular body is held between flanges at both ends of a housing. In the present invention, the liquid inlet is fixed to the housing by a liquid inlet pipe that is inserted through one flange portion and inserted into the liquid inlet, and is fixed to the housing by a liquid discharge pipe inserted into the liquid outlet. 3. Further, the present invention is a flow control device in which the pressing member is formed on a convex portion formed at J, -) that contacts the outside of the tubular body from both sides. .

(1) Specific structure of the invention Next, one embodiment of the invention will be described with reference to the drawings. In other words, it is indispensable in modern hospitals to insert a power supply into an artery or vein and to monitor the venous pulse11 or venous pressure9.When measuring blood pressure, physiological saline, etc. A transducer filled with an infusion agent is inserted into the measurement site in the blood vessel, and one end is connected in a fluid groove to a pressure transducer that converts pressure into electrical signals through a duplex. The pressure or venous pressure is transmitted through a pressure transducer or duplex to a pressure transducer, where it is further converted into an electrical signal to obtain useful data on various display and recording devices.

For example, FIG. 1 is a schematic diagram of a white liquor dynamic pressure measurement system 1, which includes a pressurized fluid source 2, an infusion tube 3, and a flow line 4 forming an infusion line; Tube 5 connected to control device 4, patient 6
A pressure transmission line is formed by the catheter 7 and the pressure transducer 8 which are connected to the blood vessel, and the pressure is displayed and recorded by the display and recording device U9.

2-4 show a flow control device 4 according to the invention. That is, the liquid inlet 11 and the liquid outlet 1
At least one tube communicating with the liquid inlet 11 and the liquid outlet 12 is disposed in an elastically deformable tubular body 13 having at least one
A cylindrical liquid flow regulating member 15 is inserted to the right of the capillary tube 14 . This elastically deformable tubular body 13 is made of natural rubber or synthetic rubber such as silicone rubber, butyl rubber, nitrile rubber, chloroprene rubber, SBR, ethylene-propylene terpolymer rubber, and preferably silicone rubber. At the location where the liquid flow regulating member 15 is inserted, the tubular body 1 of the lever is inserted from both end surfaces 15a, 15b of the liquid flow regulating member
Recesses 16a and 16b are formed by partially cutting out the inside of 3.

In other words, both the concave portions 16a and 16b are blocked by the convex portion 17 formed between the two concave portions.

This tubular body 13 includes a housing 1 provided with a pressing member 19.
It is stored in 8. This pressing member 19 is the tubular body 1
A convex portion 20 is formed so as to touch the outside of 3 from both sides, and a pressing portion 21.21 is formed extending outward from both convex portions 20.20. Moreover, this pressing member 1
9 deforms the convex portion 17 formed between the two concave portions 16a and 16b as will be described later. ! Part 1 16
The pressing member 19 is formed to correspond to the liquid flow regulating member 15, and is particularly preferably formed integrally with the housing 18. Further, it is preferable that the cross-sectional shape of this pressing member is V-shaped with the tubular body sandwiched therebetween. This housing 1B, particularly the pressing member 19, is made of relatively rigid synthetic resin, such as hard vinyl chloride resin, nylon, polypropylene, polyrubonate, ABS resin, etc.

Further, the tubular body 13 is normally stored between flanges 18a and 18b at both ends of the housing 18. In this case, the liquid inlet 11 passes through one flange portion 18a and the liquid inlet pipe 2 is inserted into the liquid inlet 11.
2, and the liquid outlet 12 is connected to the other flange part 18b.
Preferably, the tubular body 13 is fixed to the housing 18 by inserting a liquid discharge pipe 23 into the liquid discharge 1'' 12 through the liquid discharge tube 12. The inner surface 2 of this liquid introduction pipe 22
4 forms a luer taper and functions as a side-type luer taper connector.

Furthermore, a filter 25 is attached to the inside of the liquid introduction pipe 22 if necessary. If the tip of the tube communicating with the drip tube 3 is made into a male Luer Tarbor connector,
A tapered fit is now possible, and the liquid is allowed to flow and be introduced into the flow control device 4. This filter 25 is normally attached perpendicularly to the direction of liquid flow, and flows out from the liquid source 2 and drip tube 3. If foreign matter is present in the liquid, it is trapped. The purpose of this filter 25 is to prevent the capillary pores 14 from being clogged with tribute and obstructing the flow. The filter 25 can be easily attached using a known insert 1-molding method. The opening of filter 25 is 50μ from 10μ wing x 10μ helmet.
Dragon X is preferably between 50 μm, more preferably 15 μm.
It is between 15 μm and 30 μm, which is desirable from the viewpoint of liquid flow resistance and safety factor during trapping.

Since the liquid flow regulating member 15 is held between the liquid introduction pipe 22 and the liquid discharge pipe 23 which are inserted from both sides, the ends of the liquid introduction pipe 22 and the liquid discharge pipe 23 are connected to the two recesses 16a and 16b. Cut-out portions 22a and 23a are formed in at least a portion thereof so as to communicate with each other. Alternatively, instead of forming the cutout portions 22a and 23a, a spacer such as a cutout ring (not shown) having a portion corresponding to the cutout portion cut out may be inserted to communicate with the recesses 16a and 16b, respectively. You can. The liquid flow regulating member 15 is made of glass, synthetic resin, such as epoxy resin, polypropylene, hard vinyl chloride resin, polystyrene, polycarbonate-1, nylon, polyacetal, polyethylene terephthalate, or the like.

The diameter and length of the capillary pores are determined by the pressure of the pressurized liquid source and the slow flow rate.
00μ, preferably 50-70μ, length 3-20I
III111 Preferably 5-b For example, if the straight rod is 50μ empty and the width is 5mm, a flow of m3 inches/hr can be obtained.In this way, a low flow passage is constructed.

(2) Specific effects of the invention Next, the effects will be explained. For example, in a heavy liquid dynamic measurement system 1 as shown in FIG. 1, when priming is performed in the flow control device 4 connected to the liquid source 2 via the drip tube 3 and to the passage pipe via the tube 5. Before making the connection with the catheter 7, see Figure 4.
As shown in 8), the pressing portion 21.21 of the pressing member 19
When pressed with a finger 26.27, the pressing portion 21.21 forming a hinge acts as a lever to press the portion of the tubular body 13 corresponding to the fluid circulation a11 member 15, particularly the two concave portions 16a, The portion corresponding to the convex portion 17 between 161+ is elastically deformed. That is, since the pressing force from the horizontal direction causes elastic deformation in one direction, a gap is created between the liquid flow regulating member 15, which is highly rigid and does not deform, and the tubular body 13, and both the concave portions 16a and 16b communicate with each other, thereby increasing the height. A flow passageway 28 is formed. If priming is performed at this time, the liquid will mainly flow through the high flow rate passage 28. After a short time, the system is filled with the liquid in the liquid source 2.

In this case, the pressing member 19 is
If the convex portions 20 and 20 of A1 are formed as shown in FIG. 1, it is possible to stop the upward escape when the tubular body 13 is elastically deformed by the hinge force, thereby ensuring the formation of the high flow velocity passage 28 and also preventing the suppression. j can be small.

Next, when the tube 5 is connected to the cuff chill 7 and the pressure on the pressure acting part 21.21 is released, the fourth
As shown in FIG. There is only a low flow passage. Therefore, the liquid supplied from the drip tube 3 passes through the capillary tube 14 via the filter 25 and is supplied to the patient at a predetermined low flow rate, while the desired measurement is performed by the pressure transducer 8.

(3) Specific Effects of the Invention As described above, the present invention provides an elastically deformable tubular body having a liquid inlet and a liquid outlet; a cylindrical liquid flow regulating member having at least one capillary tube communicating with the liquid flow regulating member; and at least two recesses that are partially formed on the inner surface of the tubular body from both end faces to the side faces of the liquid flow regulating member and that are not connected to each other. The tubular body is accommodated by a pressing member that accommodates the tubular body and is capable of pressing the outside of the tubular body in a direction substantially perpendicular to the axial direction of the tubular body at a location corresponding to the liquid flow regulating member J portion. and a housing comprising a body, so that when the pressing member is pressed, only the tubular body is deformed to form a gap between the tubular body and the flow regulation I+1 member that communicates the recessed part. Since this is a flow control device characterized by having a structure of Therefore, the part to be elastically deformed is small and dense, and since the tubular body is held between the pressing members, it is elastically deformed with an extremely small pressing force to close the gap that will become a high-flow passage between the tubular body and the liquid flow regulating member. It can be easily formed between Therefore, briming etc. can be easily performed. In addition, since the number of parts is small, manufacturing is not only easy and inexpensive, but also the high-speed flow rate and low-speed flow rate can be switched with one presser of the pressing member, so the child cutting 1% 1ffi production is quick. It's big and safe. In addition, it is possible to elastically deform the outer diameter of the liquid flow regulating member (7) by appropriately setting the inner diameter dimension of the tubular body before caulking or the length dimension of the recess of the tubular body, the caulking force can be set. Excessive pressure due to operational error on the pressure transmission line side (W4
For example, 2 kg/'T or more) can be released to the pressurized bag side, thereby preventing the expensive transducer from being destroyed. Furthermore, the structure is ff1i
Since the flow path is simple and straight, the air inside the device can be easily removed.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a state in which the flow control device according to the present invention is incorporated into a hemodynamic pressure measurement system, FIG. 2 is a side view showing an example of the flow control device according to the present invention, and FIG. Second
Figure 4 (A) is a cross-sectional view taken along line ■-■ in Figure 3 during low-speed flow, and Figure 4 (B) is a cross-sectional view taken along line IV-IV in Figure 3. FIG. 3 is a cross-sectional view during high-speed flow. 11...Liquid inlet, 12...Liquid outlet, 13
...Elastically deformable tubular body, 14...Capillary tube, 15
... Fluid flow regulating member, 16a, 16b... Concave portion, 17-... Convex portion, 18.
...Housing, 19...Press member, 20...
Convex portion, 21...Press action part, 22...Liquid introduction pipe, 23...Liquid discharge pipe, 24...Taber part. Figure 3

Claims (5)

[Claims] (1) A cylindrical liquid having an elastically deformable tubular body having a liquid inlet and a liquid outlet, and at least one capillary inserted into the tubular body and communicating with the liquid inlet and the liquid outlet. a flow regulating member; at least two recesses partially formed on the inner surface of the tubular body from both end faces to side surfaces of the liquid flow regulating member and not connected to each other; a housing comprising the tubular body by a pressing member that can press the outside of the tubular body in a direction substantially perpendicular to the axial direction of the tubular body at a location corresponding to the housing, and when the pressing member is pressed; 1. A flow control device characterized in that a gap is formed between the tubular body and the flow regulating member by deforming only the tubular body to allow the recess to communicate with the flow regulating member. (2) The flow control device according to claim 1, wherein the pressing member has a V-shaped cross section with the tubular body sandwiched therebetween, and is formed integrally with the housing. (3) The flow control device according to claim 1 or 2, wherein the tubular body is sandwiched between flanges at both ends of the housing. (4) The liquid inlet is fixed to the housing by a liquid inlet pipe that is fitted into one flange and inserted into the liquid inlet, and the liquid outlet is fitted into the other flange and fixed to the housing. 4. The flow control device according to claim 3, wherein the flow control device is fixed to the housing by a liquid discharge pipe fitted into the housing. (5) The flow control device according to any one of claims 1 to 4, wherein the pressing member has a convex portion formed to contact the outside of the tubular body from both sides. .