WO2007105779A1

WO2007105779A1 - Check valve, and check valve expanding part

Info

Publication number: WO2007105779A1
Application number: PCT/JP2007/055154
Authority: WO
Inventors: Kouki Ohkanda; Mitsuji Hosoda
Original assignee: Enomoto Co., Ltd.
Priority date: 2006-03-10
Filing date: 2007-03-08
Publication date: 2007-09-20
Also published as: CN101395416B; CN101395416A; JP2007239940A

Abstract

Provided is a check valve assembly, which has a counterflow preventing structure for restricting the flow of a liquid to only one direction thereby to open/close a check valve simply, precisely and reliably. The check valve assembly comprises a sack-shaped check valve including a bowed portion, which has two leading end portions of a rectangular section linearly contacting, when closed, at its longer sides with each other and bent, when opened, into a sector section having two ends contacting with each other while leaving a clearance at its center, and a cylindrical portion continuing to the bowed portion, and a check valve expanding part for applying such a force from the inner side as to bring the two ends near the leading end portions of the bowed portion always apart from each other.

Description

Description Non-return valve and check valve extension parts

The present invention relates to a check valve, a check valve expansion component, and a check valve assembly device that assembles a check valve and a check valve expansion component, and particularly in a human or animal treatment tool, Only check valves and check valve expansion parts that are controlled simply, precisely and reliably. Background art

Conventionally, as a check valve, for example, there is one described in Japanese Patent Application Laid-Open No. 2004-324773 (Patent Document 1).

FIG. 24 is a schematic view of a conventional check valve by the present applicant. (A) is a front view, (b) is a plan view, (c) is a left side view, and (d) Is a right side view.

(Patent Document 1) Japanese Patent Laid-Open No. 2 004-3 24 73 2

The check valve 5 has a crow mouth portion 5a, a flange portion 5b, a mounting portion 5c, and a positioning V-cut 5d. The valve body is made of a soft rubber material such as silicone rubber.

The crow mouth part 5a has a structure like "Ahinore's beak", but it has two outer surfaces.

It has a wedge shape made of 5 e and 5 ί, and the tip parts 5 g and 5 h have a substantially rectangular cross section. When closed, the long sides 5 i and 5 j are in contact with each other to form a straight line. The outer surfaces 5 e and 5 f are curved surfaces close to a plane, the angle Θ 1 formed by the outer surfaces 5 e and 5 f is 60 °, and the inner surfaces 5 k and 5 1 are flat surfaces or curved surfaces close to a plane. The angle Θ 2 between 5 k and 5 1 is 50 °. The width of the hollow part consisting of the inner surface is almost constant. The height of the force decreases linearly toward the tip in a wedge shape.

The tip portions 5 g and 5 h are thin at the center, thick at both ends, and the long side facing the long side on the contact side is bent in an arc.

The flange part 5b is hollow and cylindrical, and there are V-cuts 5d for positioning at two opposing positions on the outer surface.

Mounting part 5c is flanged and has a slightly larger outer diameter. The inner diameter changes linearly along the central axis and becomes larger as the inflow side increases toward the outflow side.

Since it is necessary to administer medicinal solution to the human body over blood pressure in infusion of medicinal solution, etc., in the check valve operation, when the pressure on the inflow side of the infusion tube is larger than the venous blood pressure on the outflow side, It is preferable to ensure that chemicals flow out in the positive direction. '

In addition, when transport of chemicals, etc. is completed, blood flows backward through the needle tube due to blood pressure, so it closes when the pressure on the inflow side of the infusion tube is less than or equal to the venous blood pressure on the outflow side. Preferable to prevent the backflow of blood.

However, in the case of an indwelling needle, the inner needle part (metal needle and resin part), the outer needle part and the inner needle are always combined in the penetrating state on the heel side of the outer needle, and the check valve is located inside the outer needle. Because it is installed, the inner needle is stored in the center of the valve. Therefore, if the check needle made of a rubber soft material such as silicone rubber has a habit of metal needles and the crow mouth is left for 35 days, the maximum is 0.27 mm. 1 7 mm open mouth occurs.

1 to 4 are schematic views of the check valve before use, and FIGS. 5 to 8 are schematic views of the check valve stored in a state where the metal needle is penetrated. FIG. 12 is a schematic view of the check valve in which the mouth opening state occurs.

In such a conventional check valve structure, when the pressure on the inflow side of the infusion tube is equal to the differential pressure between the venous blood pressure on the outflow side due to the habit of a metal needle in the valve, As shown in Fig. 12 and Fig. 12, there was a problem that a slight back flow occurred due to the opening of the mouth of the crow mouth 1 j and the center of the lk. (Problem 1). In addition, when the metal needle is entangled in the valve, the long side of the end of the crow mouth is 11 and lm even when the pressure difference between the inflow side of the infusion tube and the venous blood pressure on the outflow side is slight. There was a problem that the chemical solution did not flow out in the positive direction due to contact and closing. (Problem 2) Disclosure of the invention

Therefore, the problem to be solved by the present invention is to solve the above problems, limit the flow of the liquid to only one direction, and provide a reverse flow prevention structure that opens and closes the check valve in a simple, precise and reliable manner. It is to provide check valves and check valve extension parts.

Problem 1 is the check valve expansion component according to claim 1, that is, a sac-shaped check valve having a cylindrical portion and a crow mouth portion, and the tip of the crow mouth portion is substantially two. Check valve expansion component that applies a force to keep both ends of the end of the crow mouth part away from the long side of the check valve that has a rectangular cross section and the long sides of the rectangular cross section are in linear contact with each other when closed. Can be solved.

In addition, the above problem 1 is that the check valve expansion part according to claim 2, that is, two columnar members having a triangular cross section near the front end are arranged substantially in parallel with one side facing inward, The problem can also be solved by a check valve expansion component characterized by having a columnar member that moves slightly away from the tip.

Further, the above problem 2 is a check valve extension part according to claim 3, that is, a sack-like check valve having a cylindrical portion and a crow mouth portion, and the tip of the crow mouth portion is 2 In a check valve that has two rectangular sections, and the long sides of the rectangular sections are in contact with each other in a straight line when closed, the angle formed by the outer surface of the crow mouth is closer to the cylinder than in the vicinity of the tip. It can be solved by a check valve, which is large and close to the tip, and the angle formed by the outer surface is slightly larger than the angle formed by the inner surface. You can decide.

In the check valve of the present invention, the angle formed by the outer surface of the crow mouth is made larger near the cylindrical portion than near the tip portion, and both ends of the crow mouth portion are always kept away by using check valve expansion parts. Apply pressure from the heel side, push the side of the cylindrical part of the check north valve with the outer needle hub, and add the force from the outside to leave the check valve mouth open for 2 years. Even within mm, the liquid flow is limited to one direction. If the opening is within 0.05 mm, the valve can be closed with venous pressure, and the check valve can be opened and closed easily, accurately and reliably. Brief Description of Drawings

FIG. 1 is a front view showing a state before use of the check valve.

FIG. 2 is a plan view showing a state before use of the check valve.

FIG. 3 is a left side view showing a state before use of the check valve.

FIG. 4 is a right side view showing a state before use of the check valve.

FIG. 5 is a front view showing a storage state in which the inner needle penetrates through the central portion of the check valve. FIG. 6 is a plan view showing a storage state in which the inner needle penetrates through the central portion of the check valve. FIG. 7 is a left side view showing a storage state in which the inner needle penetrates through the central portion of the check valve.

FIG. 8 is a right side view showing a storage state in which the inner needle penetrates through the central portion of the check valve.

FIG. 9 is a front view showing a state where the check valve is opened with the metal needle penetrated and stored.

FIG. 10 is a plan view showing the opening state of the check valve stored through the metal needle.

Figure 11 shows the left side of the check valve with the metal needle penetrated and stored. FIG.

FIG. 12 is a right side view showing a state where the check valve is opened with the metal needle penetrated and stored.

FIG. 13 is a front view schematically showing an embodiment of a check valve according to the present invention. FIG. 14 is a plan view schematically showing an embodiment of the check valve according to the present invention. FIG. 15 is a left side view schematically showing an embodiment of the check valve according to the present invention. FIG. 16 is a right side view showing the outline of the embodiment of the check valve according to the present invention. FIG. 17 is a right side view, partially broken away, showing a state in which the metal needle has been removed from the improved check valve.

FIG. 18 is a front view showing a partially broken state in which the check valve expansion part according to the present invention is inserted into the outer needle. '

FIG. 19 is a plan view showing a state in which the check valve expansion part according to the present invention is partially broken when inserted into the outer needle.

FIG. 20 is a left side view showing a partially broken state in which the check valve expansion component according to the present invention is inserted into the outer needle hub.

FIG. 21 is a front view showing a state in which the check valve with the check valve expansion part inserted is fixed by the holder portion of the outer needle hub and the cap is set, partially broken.

FIG. 22 is a right side view, partially broken away, showing a state where the check valve with the check valve expansion part inserted is fixed by a part of the holder of the outer needle hub and the cap is set.

FIG. 23 is a plan view showing a state in which the check valve into which the check valve expansion part is inserted is fixed by the holder portion of the outer needle hub and the cap is set, partially broken.

Fig. 24 is a schematic view of a conventional check valve, (a) is a front view, (b) is a plan view, (c) is a left side view, and (d) is a right side view. FIG. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a check valve and a check valve expansion part according to the present invention will be described with reference to the drawings.

FIG. 13 is a front view schematically showing an embodiment of a check valve according to the present invention. The check valve is composed of a crow port 1a, a cylindrical portion 1b, a mounting portion 1c, and positioning grooves 1d, l e (see Fig. 14). The check valve is made of a soft rubber material such as silicone rubber, synthetic rubber or natural rubber.

The crow mouth 1 a is a so-called “duck mouth” -like structure, which is divided by four outer surfaces, 1 f, lg, 1 h, 1 i, which are curved surfaces close to a plane (Fig. 14) reference). The outer surfaces 1 f and 1 h and the outer surfaces 1 g and 1 i are positioned symmetrically across the center line of the crow mouth 1 a. The tip parts 1j and lk are almost rectangular in cross section, and when closed, the long sides 11 and 1m are in contact with each other to form a straight line.

The outer surface of the crow mouth part 1a, 1f and 1g, and 1h and 1i have different inclination angles, and in the cross section orthogonal to the linear contact line of the tip part lj and 1k when closed The angle formed by the outer surfaces 1 h and 1 i near the tip of the crow mouth 1 a is slightly larger than the angle formed by the outer surfaces 1 f and 1 g near the cylindrical portion. The outer surfaces 1 f and l g are thicker than 1 h and 1 i.

Cylindrical part 1 b is hollow cylindrical, and positioning grooves l d and l e are attached on the outer circumference of attaching part 1 c at intervals of 180 ° around the central axis.

Insert the check valve expansion part 2a into the cylindrical part 1b as shown by the dotted line. At this time, the tip end portions 2b and 2c of the check valve expansion part 2a are used to change the contact inner surfaces 1n and 1p (see Fig. 14) and 1o and 1q at both ends of the crow mouth. Try to spread. The tip 2b and 2c of the check valve expansion part 2a are made of metal by applying force from the inside to keep both ends 1r and 1s, and 1t and 1u in contact with each other. Make it easy to fix the habit of opening the mouth with a needle.

The inner surface ln, 1 o is a plane or a curved surface close to a plane. Inner ln, lo or The width of the hollow part is almost constant, but the height decreases like a wedge toward the center of the long side 11 that forms the tip. By reducing the height of the hollow part, the tip 2b, 2c force of the check valve expansion part 2a is efficiently increased from the inside, making it easier to correct the opening of the valve by the metal needle of the valve .

The mounting portion 1c is in the shape of a bringe, the inner diameter changes linearly, and the inflow side becomes larger and becomes smaller as it approaches the cylindrical portion 1b. Insert the check valve expansion part 2a into the cylindrical part 1b with the inclined part on the inner side as a guide means.

FIG. 14 is a plan view schematically showing an embodiment of the check valve according to the present invention. Insert the check valve with the check valve expansion part 2a into the holder 3a of the outer needle hub 3 and fix it (see Fig. 19). The holder portion 3a has a square-shaped locking hole 3d on the inner side surface of the small diameter cylindrical portion 3a. As shown in FIG. 18, the check valve expansion component 2a includes a substantially trapezoidal locking protrusion 2d on a small diameter cylindrical portion 2e. Insert the check valve into the outer needle hub 3 and fit the locking projection 2d of the check valve expansion part 2a into the locking hole 3d and fix it.

At the tip 2b, 2c of the check valve expansion part 2a, both ends 1r and 1s of the valve, and

Apply force from the heel side so that both ends are kept apart while 1 t and 1 u are in contact with each other, and with the holder 3 a of the outer needle hub 3, apply force in the direction of the arrow from the outside so as to press the side of the cylindrical part of the disc. Add. This makes it easier to correct the opening of the check valve.

The outer surface 1 ί and 1 g near the cylindrical portion of the crow mouth 1 a should be thicker than the outer surfaces 1 h and 1 i near the tip. As a result, the force that the holder part 3a of the outer needle hub S applies to the side surface of the cylindrical portion of the valve in the vertical direction is efficiently increased, and the effect of preventing the opening is improved.

FIG. 1′5 is a left side view schematically showing an embodiment of the check valve according to the present invention. When closed, the long sides 1 1 and 1 m are closed in contact with a straight line, and the long side against the contact side is bent in a bow shape. At the time of opening, the tip portions 1 j and 1 k bend to form a fan-shaped cross section. Both ends 1 r and 1 s and both ends 1 and 1 u are opened with a gap in the middle of the long sides 1 1 and 1 m while keeping the cross section in contact.

FIG. 16 is a right side view schematically showing an embodiment of the check valve according to the present invention. When inserting the inner needle into the check valve, push the tip into the checkered crow's mouth 1 a long side of the tip 1 a, 1 m, push it wide and insert it into the check valve. . Since the tip of the inner needle is applied diagonally, there is almost no trouble that the tip of the inner needle touches the flesh of the check valve to make a hole.

FIG. 17 is a right side view, partially broken away, showing a state in which the metal needle has been removed from the improved check valve. The valve opening state by the metal needle shown in Fig. 11 has been eliminated. '

FIG. 18 and FIG. 19 and FIG. 20 are schematic views showing a state in which the check valve expansion part 2 a according to the present invention is inserted into the outer needle hub 3 in a partially broken view. FIG. 8 is a front view, FIG. 19 is a plan view, and FIG. 20 is a left side view.

The check valve expansion part 2a includes tip portions 2b and 2c (see FIG. 19) and a small diameter cylindrical portion 2e.

The tip 2b, 2c has a shape in which two columnar members with a triangular cross-section near the tip are arranged in parallel, with one side facing the other side, and slightly distant from the tip. .

The small-diameter cylindrical portion 2 e has a substantially trapezoidal protrusion 2 f protruding toward the outflow side on the left side surface. Protrusion 2 f grips and secures check valve mounting part 1 c to prevent movement in the central axis direction.

The small diameter cylindrical part 2e is 90 on the outer circumference. It has a pair of locking projections 2 d that fit into locking holes 3 d provided on the inner side surface of the holder portion 3 a of the outer needle hub 3 at intervals. Check valve Extension part 2a Locking protrusion 2d and holder 3a Locking hole 3d must be fitted Thus, the check valve expansion part 2 a and the outer needle hub 3 can be joined without an adhesive.

The outer needle hub 3 is composed of a holder portion 3a, a large-diameter cylindrical portion 3b, a positioning groove 3c, and a cap 4 (see FIG. 21), which will be described later. The holder portion 3a has a locking hole 3d that fits with the locking projection 2d of the check valve expansion component 2a at an interval of 90 ° on the inner side surface.

A positioning groove 3c for fitting the locking portion 4h of the cap 4 is provided on the outer periphery of the large diameter cylindrical portion 3b.

Fig. 21 and Fig. 2 Fig. 2 and Fig. 2 3 show a part of the state where the check valve with the check valve expansion part 2 a inserted is fixed with the holder part of the outer needle hub 3 and the cap 4 is attached. FIG. 21 is a cutaway schematic view, FIG. 21 is a side view, FIG. 2 2 is a right side view, and FIG. 23 is a plan view.

The cap 4 includes an outer needle portion 4c, a knob portion 4d, and a hollow portion 4f.

The knob portion 4 d has rectangular protruding portions 4 a and 4 b on both sides of the outer surface. The protruding parts 4a and 4b are respectively 1 r and 1 s at both ends of the crow mouth part of the check valve 1, and

When the protrusions 4a and 4b are pressed toward the center, located on the extension line of 1u and 1t, both ends of the check valve are pushed in the direction of the center axis, and the tip portions 1j and 1k Bent and has a fan-shaped cross section. Both ends 1 r and 1 s, and 1 t and 1 u are in contact with each other, leaving a gap in the center of the long sides 1 1 and l m to open the valve

The hollow portion 4 f accommodates therein a check valve into which the check valve expansion component 2 a is inserted, a holder portion 3 a and a large-diameter cylindrical portion 3 b to be fitted with the check valve expansion component. The locking hole 4h of the cap 4 is fitted and fixed to the positioning groove 3c provided on the outer periphery of the large-diameter cylindrical portion 3b '. The rear end of the hollow part 4 f opens and is joined to the infusion tube.

The hollow portion 4 f has a quadrangular prism-shaped tipping prevention protrusion 4 g on the side surface near the knob portion 4 d. According to the check valve and the check valve expansion part 2a and the outer needle hub 3 and the cap 4 in the embodiment of the present invention, when the differential pressure between the inflow side and the outflow side of the infusion tube is equal, By closing the valve and shutting off the internal flow path of the valve member, blood backflow can be reliably prevented. In addition, even when the pressure on the inflow side of the infusion tube is slightly larger than the differential pressure of the venous blood pressure on the outflow side, the valve can be opened reliably and the drug solution can flow out in the forward direction. Industrial applicability

According to the check valve, the check valve expansion part and the outer needle hub according to the present invention, since the blood backflow is effectively prevented, it is safe for children and elderly people who have few veins and are difficult to puncture. Every time a reliable intravenous therapy is performed. It also prevents blood flow obstruction and reduces the risk of complications such as phlebitis. Furthermore, it is easy to hold and can puncture safely and with character.

Claims

Scope of request A check valve in the form of a sack with a cylindrical part and a crow mouth part. The tip of the crow mouth part has two almost rectangular sections, and when closed, the long sides of the rectangular section are straight to each other. Check valve expansion parts that apply force to keep the ends of the crow mouth part at the long side of the check valve in contact with each other.

A check valve expansion component characterized by having two columnar members having a triangular cross section near the tip, arranged in parallel with one side facing inward, and having a columnar member that moves slightly away from the tip.

A sac-shaped check valve having a cylindrical portion and a crow mouth portion, and the tip of the crow mouth portion has two substantially rectangular sections, and when closed, the long sides of the rectangular section are in contact with each other in a straight line. In the check valve, the angle formed by the outer surface of the crow mouth portion is larger near the cylindrical portion than near the tip, and the angle formed by the outer surface is slightly larger than the angle formed by the inner surface near the tip. Check valve characterized by