JP2002291885A - Flow rate switching unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow rate switching unit which is used for a transfusion set, or the like, which can simply administrate a fluid at a preset administrating speed without necessity of a regulating work of a flow rate and which can further interrupt flushing or administrating of the fluid. SOLUTION: The flow rate switching unit 1 comprises a support 2, a rotatable operating member 3 engaged with the support 2, and a cylindrical part 4 disposed between the support 2 and the member 3. Further, a channel bottom member 5 is installed in the cavity of the cylindrical part 4, and a control groove 8 for controlling the flow rate is provided at the member 5. The member 3 has a first pressing part 7 and a second pressing part 11 for pressing the part 4. When the member 3 is rotated and the part 4 is pressed by the part 7, only the groove 8 becomes the channel, and hence the flow can be administered at a predetermined administering speed by a cross-sectional area set by the groove 8. When the member 3 is rotated and the part 4 is pressed by the part 11, the part 4 is blocked to interrupt the administering. Further, when the member 3 is rotated, the part 7 and the part 11 both become inoperative states and can flush the fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a creme that can administer a fluid such as an infusion, blood, or nutrient at a constant rate, or can interrupt the administration.

[0002]

2. Description of the Related Art Devices that administer fluids such as infusions, blood, nutrients, and the like at a constant speed are known which use pores or thin tubes. For example, in a device used for an infuser pump, the fluid administration rate is determined by setting the inner diameter of the tube.

However, in this case, when the administration is interrupted or the fluid is flushed, a new clamp is added and the tube is clamped. A large bypass tube is required. This can result in higher production costs.

[0004] In addition, a roller clamp for adjusting the administration speed, which is used in a conventional infusion set or the like, can freely set the administration speed. The setting is based on the number of drops falling from a clock or a drip tube. While checking while checking, etc.,
It takes a lot of space. For this reason, even when the drug is administered only at a constant administration rate, the method has to be set in such a troublesome manner.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is no need to adjust the flow rate, the fluid can be easily administered at a set administration rate, the administration can be interrupted, and the fluid can be flushed. Is to provide equipment.

[0006]

The present invention can be achieved by the following.

(1) A support having an engaging portion, an operating member rotatably engaged with the engaging portion as a fulcrum, and the supporting member positioned between the supporting member and the operating member. A part of the outer periphery is supported by the body, and a cylindrical body having an inflow port and an outflow port of a fluid, and a hard material closely adhered to a support side of a bore of the cylindrical body forming the flow path of the fluid. A flow switching device comprising a flow path bottom member, wherein the operating member has a first pressing portion and a second pressing portion for pressing a flow path side outer peripheral portion of the tubular body, The road bottom member has a control groove extending in the axial direction of the tubular body, and the cross-sectional shape of both end portions of the flow path bottom member near the boundary between the tubular body and the flow path bottom member is continuous. A flow switch having a moderately rounded shape and a central portion having a concave shape.

(2) The first pressing portion is installed at a position where the first pressing portion cooperates with the flow path bottom member to press the cylindrical body at the time of pressing, and the second pressing portion cooperates with the support at the time of pressing. (1) The flow rate switching device according to (1), wherein the flow switching device is installed at a position where the cylinder pushes the cylindrical body.

(3) The first pressing portion has a convex cross-sectional shape large enough to be inserted into the concave shape, and has a continuous and gentle cross-sectional shape at both end portions of the flow path bottom member. The relationship between the radius R of the roundness and the thickness D of the cylindrical body is R ≧
D / 10, wherein the flow rate switch according to (1) or (2).

(4) The flow rate switching according to (1) to (3), wherein the circumferential length of the lumen of the cylindrical body is set shorter than the circumferential length of the cross-sectional shape of the flow path bottom member. vessel.

(5) The cylindrical body has a deformed portion in which a portion pressed at the time of pressing is deformed, and the deformed deformed portion and the flow path bottom member adhere to each other except for the control groove, and The portion, the tensile strength always acts on the cross-sectional inner surface perpendicular to the axial direction of the cylindrical body, when not pressed, the cross-sectional shape perpendicular to the axial direction of the cylindrical body is a linear shape, at least the A surface where the inner surface of the tubular body near the flow path formed from the deformed portion and the flow path bottom member and the flow path bottom member is in contact with the flow path bottom member is an adhesive portion that is not adhesively fixed (1). ) The flow rate switch according to (4).

(6) The flow rate switch according to any one of (1) to (5), wherein a numerical value indicating a flow rate is described in the operating member.

(7) The flow switching device according to any one of (1) to (6), wherein the tubular body is any one of an infusion tube, a blood transfusion tube, and a nutrition tube.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a flow switch 1 according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG.

FIGS. 2, 3 and 4 are cross-sectional views of the flow switching device of the present invention, showing the rotating state of the operating member.

FIG. 5 is a cross-sectional view showing the tubular body of the present invention and the channel bottom member installed in the tubular body cavity.

The flow switching device 1 of the present invention comprises at least a support 2, an operating member 3, a cylindrical body 4, and a flow path bottom member 5. The operating member 3 is engaged with an engaging portion 6 provided at an end of the support 2, and is rotatably engaged with the engaging portion 6 as a fulcrum.

The operating member 3 is provided with a first pressing portion 7 for pressing the outer peripheral portion of the cylindrical body 4 on the flow path side. Actuating member 3
Has a second pressing portion 11 for completely closing the flow path in the tubular body 4.

A cylindrical body 4 having a fluid inlet and a fluid outlet.
Is located between the support 2 and the operating member 3, and a part of the outer periphery is supported by the support 2. A flow channel bottom member 5 made of a hard material, which has a fluid channel formed therein, is in close contact with the support side of the lumen, and is partially fixed, is provided in the lumen of the tubular body 4.

The flow path bottom member 5 has a control groove 8 extending in the axial direction of the cylindrical body 4, and the control groove 8 has an appropriately set cross-sectional area for controlling the flow rate of the fluid. ing.

The cross-sectional shape of both end portions 20 of the flow path bottom member near the boundary between the cylindrical body 4 and the flow path bottom member 5 has a continuous gentle roundness. Thereby, the first pressing portion 7
Thus, when the tubular body 4 is pressed, the flow path bottom member 5 and the tubular body 4 are in close contact except for the control groove 8.

That is, only the control groove 8 is opened, and this control groove 8 becomes a fluid flow path. At this time, the flow rate is determined by the cross-sectional area appropriately set as described above.

The cross-sectional shape of the control groove 8 is not particularly limited as long as the groove is formed, such as a V-shape. As described above, a shape having no corners at the bottom of the groove and dispersing the stress to easily increase the strength is preferable.

The channel bottom member 5 has a concave cross section perpendicular to the axial direction of the cylindrical body 4 on the channel surface side.
The first pressing portion 7 has a sectional shape that is a convex shape large enough to be inserted into the concave shape. It is preferable that the relationship between the radius R of the continuous gentle roundness of the cross-sectional shape of both end portions of the flow path bottom member 5 and the thickness D of the cylindrical body is R ≧ D / 10.

The relationship between the radius R of the cross-sectional shape at both end portions of the flow path bottom member 5 and the thickness D of the cylindrical body 4 is R ≧ D / 1.
When 0 is satisfied, a gentle round shape can be obtained. When the radius R and the thickness D have a relationship of R <D / 10, when the first pressing portion 7 presses the cylindrical body 4, both end portions of the cylindrical body 4 are on both sides of the flow path bottom member 5. It becomes difficult to adhere to the shape of the end portion, and a gap is created between the flow path bottom member 5 and the tubular body 4.

The cylindrical body 4 has a deformed portion in which the pressed portion is deformed when pressed, and the deformed deformed portion and the flow path bottom member 5 are deformed.
Are in close contact with each other except for the control groove 8.

In the deformed portion, it is preferable that a tensile strength of 0 or more always acts on the inner surface of the cross section perpendicular to the axial direction of the cylindrical body 4. When the tensile strength is applied, the deformed portion does not loosen when not pressed. Thus, when the deformed portion is pressed by the first pressing portion 7, no further gap is generated between the gentle curved surface of the flow path bottom member 5 and the corresponding portion.

There is no problem with any method of applying tensile strength. For example, the peripheral length of the cross-sectional shape of the flow path bottom member 5 may be slightly larger than the circumferential length of the lumen of the tubular body 4. It becomes possible by setting.

Further, when the deformed portion 12 is not pressed, the cross-sectional shape perpendicular to the axial direction of the cylindrical body 4 is linear, and the flow formed by the deformed portion 12 and the flow path bottom member 5 is formed. Road 3
It is preferable that the vicinity of the surface where the inner wall of the cylindrical body 4 and the flow path bottom member 5 near 2 come into contact with each other without being fixed is a close contact portion. With such a configuration, when the cylindrical body is pressed by the first pressing portion 7, no gap is generated between the flow path bottom member 5 and the gently rounded curved surface.

The material of the channel bottom member 5 is preferably a material having an appropriate hardness that can be molded stably, and examples thereof include a polymer material such as polycarbonate, polypropylene, and polyethylene. The same applies to the material of the operating member 3.

Examples of the material of the cylindrical body 4 include, but are not limited to, various thermoplastic resins such as polybutadiene and vinyl chloride, and various rubbers such as isoprene rubber.

The operating member may be described with a numerical value indicating a flow rate. This makes it possible to understand the fluid administration speed at a glance.

Further, since the cylindrical body 4 is formed of any one of an infusion tube, a blood transfusion tube, and a nutrition tube, the production cost can be further reduced.

(Embodiment) Next, a configuration in which the flow rate switch of the present invention is incorporated in an infusion set will be described.

A soft tube made of polybutadiene (manufactured by JSR Corporation) having an inner circumference of 6.6 mm and a thickness D of 0.6 mm was produced as the cylindrical body 4 by extrusion molding.

As shown in FIGS. 2, 3 and 4, the flow path bottom member 5 is made of polypropylene (manufactured by Nippon Polychem) and the support 2 is made of polypropylene. The support 2 and the engaging portion 6 were also integrally formed using polypropylene.

The control groove 8 is provided on the flow path surface 31 of the flow path bottom member 5.
Is installed. The control groove 8 was manufactured by adjusting the depth and width to 32 mm in length and the cross-sectional area to 0.05 mm ² (FIGS. 2, 3, 4, and 5). At this time, the radius R of the continuous gentle roundness near the boundary 20 at the side end of the flow path bottom member 5 shown in FIG. 5 is 0.5 mm.
The radius of the concave portion provided at the center of the flow path bottom member 5 except for the control groove 15 is 2 mm, and the width of the flow path bottom member 5 is 3.5.
mm, the outer circumference was 8.4 mm, and the length was 40 mm. Except for the control groove 8, the cross-sectional outer circumference of the flow path bottom member 5 had a smooth surface without edges as shown in FIG. As shown in FIG. 6, a numerical value indicating the flow rate is given to the operating member 3.

Then, the above-mentioned soft tube (tubular body 4)
Was inserted from the end of the downstream end 30 of the flow path bottom member 5. Here, although not shown, the end of the downstream end 30 of the flow path bottom member 5 is tapered toward the downstream to facilitate insertion of the soft tube (the tubular body 4). At this time, the inner circumferential length (6.6 m) of the soft tube (tubular body 4)
Since the peripheral length (8.4 mm) of the flow path bottom member 5 is longer than m), the deformable portion 12 of the soft tube (the tubular body 4) on the flow path surface 31 is given tensile strength, as shown in FIG. As described above, the deformable portion 12 has a linear shape.

The operating member 3 is made of high-density polyethylene (manufactured by Nippon Polychem Co., Ltd.). The portion of the second pressing portion 11 provided on the operating member 3 was rotatably engaged with the substantially L-shaped engaging portion 6. The first pressing portion 7 provided on the operating member 3 has a rounded convex shape with a radius of 1.56 mm, and can be inserted into the concave portion of the flow path bottom member 5. The axial length of the first pressing portion 7 was set to 20 mm.

The flow rate switch 1 of the present invention thus produced
Was incorporated into the infusion set line (not shown).

Next, a method of using the flow rate switch 1 of the present invention will be described.

FIG. 2 is a sectional view of the flow switching device 1 of the present invention at the time of flushing. Although not shown, an upstream portion of the flow switch 1 incorporated in the infusion set is connected to an infusion agent, and a venous needle for puncturing a patient is connected downstream.

In this state, first, as shown in FIG. 2, the operating member 3 is rotated to the downstream side to open (flash) the flow path in the tubular body 4. As can be understood from FIG. 2, the first pressing portion 7 and the second pressing portion 11 are in a state where they do not act.

In this way, when the medical solution is filled in the infusion set and reaches the venous needle, the operating member 3 is rotated about 90 degrees to the upstream side as shown in FIG. At this time, the second pressing portion 11 of the operating member 3 presses the cylindrical body, and the flow path is completely closed.

In order to maintain this state, the axial length of the rotating portion 21 of the operating member 3 is adjusted from the top surface 13 of the substantially L-shaped engaging portion 6 installed on the support 2 to the bottom surface of the support 2. It is preferable that the length is equal to or slightly shorter than 14. By doing so, the rotating part 21 is sandwiched between the top surface 13 and the bottom surface 14, and the state where the second pressing part 11 presses the cylindrical body 4 can be maintained.

Thereafter, the patient is punctured with a venous needle. And
As shown in FIG. 4, the operating member 3 is moved further upstream by about 90 degrees.
Rotate degrees. As a result, the cylindrical body 4 is brought into contact with the first pressing portion 7.
The flow path of the lumen of the cylindrical body 4 pressed by the
Only the control groove 8 provided in the control groove 8.

Then, a predetermined portion of the cylindrical member 4 is pressed by the first pressing portion 7 of the operating member 3, a predetermined portion of the deformable portion 12 of the cylindrical member 4 is deformed, and the flow of the flow path bottom member 5 is changed. Close contact with the road surface 31. At this time, the cross-sectional shape perpendicular to the axial direction of the channel bottom member 5 is restored when the cylindrical body 4 is pressed due to the continuous gentle round shape of the end portion 20 of the channel bottom member 5. A gap is not generated by the force, and the cross-sectional shapes of the contact surfaces of the flow path bottom member 5 and the cylindrical body 4 are identical except for the control groove 8. For this reason, the lumen of the cylindrical body 4 at the position pressed by the first pressing portion 7 is completely closed except for the control groove 8.

The sectional area of the control groove 8 is the same as that described above.
0.05mm as^TwoSet to ^{Because 50ml / h
The fluid flows at a velocity of.}

The control groove 8 has a cross-sectional area appropriately set so that the injection is performed at a preset flow rate at a position where the cylindrical body 4 is pressed by the first pressing portion 7. be able to. Further, by changing the axial length of the first pressing portion 7 provided on the operating member 3,
The flow rate can be changed. For example, when the length of the first pressing portion 7 shown in the embodiment is changed from 20 mm to 10 mm, the flow velocity is set to 100 mm / h. this is,
In the control groove 8, as the length of the first pressing portion 7 is longer,
This is because the generated resistance increases. As described above, by preparing only the operating members in which the first pressing portions 7 are different,
It is also possible to appropriately set the flow rate.

Even if the cross-sectional area of the control groove 8 is set so as to gradually increase or decrease in the axial direction of the cylindrical body 4, an operating member having a different position or length of the first pressing portion 7 may be used. The flow rate can be easily changed simply by making it easy.

In order to maintain this state, the first pressing portion 7 presses the cylindrical body 4 by engaging the claw 15 provided on the operating member 3 with the projection 16 provided on the support 2. Can be maintained.

In order to release this state, the operating portions 17 provided on both side ends of the operating member 3 are simultaneously pressed, so that the projection 16 provided on the support 2 and the operating member 3 are pressed.
Of the actuating member 3 can be easily released by pinching and rotating the grip 23 provided at the end of the operating member 3.

When the administration of the infusion solution is to be interrupted, the operating member 3 may be turned 90 degrees to the downstream side. At this time, the cylindrical member 4 is formed by the second pressing portion 11 and the bottom surface 14 of the support 2.
Is in a closed state.

When flashing, the operating member 3 may be further turned 90 degrees downstream. In the embodiment,
When the operating member 3 is turned to the downstream side, it becomes a flash, and when it is turned to the upstream side, a predetermined flow rate flows. However, when the operating member 3 is turned to the upstream side, a flash occurs. Thus, a configuration may be adopted in which a predetermined flow rate flows when rotated to the downstream side.

[0056]

As described above, according to the flow rate switching device of the present invention, the operation of adjusting the flow rate is not required, the fluid can be easily administered at the set administration speed, and the administration can be interrupted. You can flash.

[Brief description of the drawings]

FIG. 1 is a perspective view of a flow switching device of the present invention.

FIG. 2 is a cross-sectional view of the flow switching device of FIG. 1 taken along line AA.

FIG. 3 is a sectional view when the flow rate of the flow rate switch of the present invention is set to zero.

FIG. 4 is a sectional view when the flow rate of the flow rate switch of the present invention is adjusted.

FIG. 5 is a cross-sectional view when a flow path bottom member is installed in a cylindrical body constituting a flow rate switch of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flow rate switch 2 Support body 3 Operating member 4 Cylindrical body 5 Flow path bottom member 6 Engaging part 7 First pressing part 8 Control groove 11 Second pressing part 12 Deformable part 13 Top surface 14 Bottom surface 15 Claw portion DESCRIPTION OF SYMBOLS 16 Projection part 17 Operation part 20 End part 21 Rotating part 23 Gripping part 30 Downstream end 31 Flow path surface 32 Flow path

Claims (7)

[Claims] A supporting member having an engaging portion, an operating member rotatably engaged with the engaging portion as a fulcrum, and the supporting member positioned between the supporting member and the operating member. A cylindrical body having a part of the outer circumference supported by the body and having a fluid inlet and a fluid outlet, and a flow made of a hard material closely adhered to a support side of a bore of the tubular body forming the fluid flow path. A flow switch comprising a road bottom member, wherein the operating member has a first pressing portion and a second pressing portion for pressing an outer peripheral portion of the tubular body on a flow path side, The bottom member has a control groove extending in the axial direction of the cylindrical body, and the cross-sectional shape of both side ends of the flow path bottom member near the boundary between the cylindrical body and the flow path bottom member is continuous and gentle. A flow switching device having a round shape and a central portion having a concave shape. 2. The first pressing portion is installed at a position where the first pressing portion cooperates with the flow path bottom member to press the cylindrical body at the time of pressing, and the second pressing portion cooperates with the support at the time of pressing. The flow rate switch according to claim 1, wherein the flow rate switch is provided at a position where the cylindrical body is pressed. 3. The first pressing portion has a convex cross-sectional shape large enough to be inserted into the concave shape, and has a continuous and gentle cross-sectional shape at both end portions of the channel bottom member. The relationship between the radius R of the roundness and the thickness D of the cylindrical body is R ≧ D / 10
The flow rate switching device according to claim 1 or 2, wherein 4. The flow switching device according to claim 1, wherein a circumferential length of a lumen of the tubular body is set shorter than a peripheral length of a cross-sectional shape of the flow path bottom member. 5. The cylindrical body has a deformed portion in which a portion pressed at the time of pressing is deformed, and the deformed deformed portion and the flow path bottom member are in close contact with each other except for the control groove, and the deformed portion is The tensile strength always acts on the inner surface of the cross section perpendicular to the axial direction of the cylindrical body, and when not pressed, the cross sectional shape perpendicular to the axial direction of the cylindrical body is linear, and at least the deformed portion The surface in contact with the lumen of the tubular body near the flow path formed from the flow path bottom member and the flow path bottom member is a close contact portion that is not adhesively fixed. 4. The flow rate switch according to 4. 6. The flow switching device according to claim 1, wherein a numerical value indicating a flow rate is described in the operating member. 7. The flow switching device according to claim 1, wherein the tubular body is any one of an infusion tube, a blood transfusion tube, and a nutrition tube.