JP7201152B2 - check valve assembly - Google Patents

Description

The present invention relates to a non-return valve assembly.

In the medical field, sealing valve mechanisms are required for various types of catheters, irrigation devices, endoscope devices, and the like. For example, in medical catheters such as gastrostomy catheters, the sealing valve allows substances, such as nutrients or drugs, to be externally supplied to the stomach while preventing substances supplied to the stomach from flowing back out of the stomach. It has a role to prevent
Duckbill valves, flap valves, slit valves, and the like are known as sealing valves, and duckbill valves made of silicone rubber are widely used in medical catheters. For example, Patent Document 1 discloses a sealing valve assembly that includes a valve housing having an opening and a valve member disposed within the opening. Further, Patent Document 2 discloses a check valve device in which a valve member is directly mounted inside a catheter.

Among the patients who use gastrostomy catheters, there are patients and children who spend their time actively playing sports, etc., so the sealing valve device used for the catheter should be lightweight and compact, and considering the quality and cost, it is easy to assemble. The work should be simple.

Japanese Patent Publication No. 2005-503838 JP 2011-234802 A

However, in the sealing valve assembly of Patent Document 1, the protrusion provided on the rear surface of the cap and the groove provided on the upper surface of the annular member of the housing are fixed by press-fitting or adhesive. Workability and stability are not sufficient.
Also, in the sealing mechanism described in Patent Document 2, only the anti-reflux valve is attached to the narrow lumen on the body surface of the catheter body, so that assembly workability is lacking.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a check valve assembly having a check valve and having excellent assembly workability.

The present invention is a check valve assembly comprising an upper member, a check valve, and a lower member, wherein the check valve is sandwiched between the upper member and the lower member, wherein the upper member is plate-shaped. and a fitting portion provided on the back surface of the plate-like member for fixing the upper member to the lower member. The fitting part has a first cylindrical body projecting to the back surface of the plate-like member and a fitting claw projecting to the outer wall of the first cylindrical body to prevent backflow The valve has a body portion with a slit at the lower end and an upper end flange portion, the lower member has a second cylindrical body and a side wall flange portion provided on the outer periphery of the second cylindrical body, and the second cylindrical body A fitting hole for fitting the fitting claw of the upper member is provided on the side wall of the second cylindrical body, and a locking portion for locking the upper end flange portion of the check valve is provided on the inner wall of the second cylindrical body. The upper end flange portion of the non-return valve assembly is sandwiched between the engaging portion and the bottom surface of the first cylindrical body of the upper member.

It is preferable that at least one set of fitting claws be provided at opposing positions on the outer wall of the first cylindrical body.

At least one hole or second notch is preferably provided at the end of the side wall flange.

The upper and lower members are preferably made of polyamide 6 or a composite material of polyamide 6 and glass fibers.

A third notch may be provided at the lower end of the second cylindrical body of the lower member.

The slit of the check valve may be exposed downward from the lower end of the lower member.

According to the present invention, it is possible to obtain a check valve assembly that is excellent in assembly workability.

1 is a side view showing one embodiment of a check valve assembly of the present invention; FIG. FIG. 4 is a cross-sectional view showing an example in which a supply adapter is inserted into the check valve assembly of the present invention; FIG. 4 is a side view of the upper member; It is a top view of an upper member. It is a back view of an upper member. FIG. 4 is a plan view of a check valve; FIG. 4 is a side view of a check valve; FIG. 11 is another side view of the check valve; FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6; FIG. 4 is a side view of the lower member; 1 is a cross-sectional view of a non-return valve assembly of the present invention; FIG. It is a top view of a lower member. 1 is a cross-sectional view showing a balloon catheter equipped with a non-return valve assembly of the present invention; FIG. FIG. 14 is a partially enlarged view of FIG. 13;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are presented for illustrative purposes, and the present invention is in no way limited to the embodiments shown below.

[Check valve assembly]
The check valve assembly 10 of the present invention comprises an upper member 20, a check valve 30, and a lower member 40, as shown in FIG. is sandwiched between the upper member 20 and the lower member 40 . As shown in FIG. 13, the check valve assembly 10 of the present invention is attached to the funnel portion 51 of a balloon catheter 50, for example. In the balloon catheter 50, as shown in FIG. 2, a supply adapter 70 for introducing fluid into the inside of the balloon catheter 50 is inserted from above the circular opening 23 of the upper member 20 and pushed into the slit 33 of the check valve 30. Then, the slit 33 is opened and a substance such as a nutrient or medicine can be supplied. In addition, it is possible to prevent the slit 33 from being closed by pulling out the supply adapter 70, thereby preventing the backflow of substances such as nutritional supplements and medicines.
Details of each component of the check valve assembly 10 will be described below.

(Upper member)
As shown in FIG. 3, the upper member 20 includes a circular plate-like member 21 and a fitting portion 22 provided on the rear surface 21a of the circular plate-like member 21 for fixing the upper member 20 to the lower member 40. have.
The circular plate member 21 has a circular opening 23 provided in the center and a first notch 24 provided at the end of the circular opening 23, as shown in FIG. A circular opening 23 of the upper member 20 is a portion into which a supply adapter 70 for supplying fluid is inserted. Also, the first notch portion 24 has a shape corresponding to the convex portion 71 (see FIG. 2) of the supply adapter 70 . After the convex portion 71 of the supply adapter 70 is aligned with the first notch portion 24 and the supply adapter 70 is inserted, the convex portion 71 is moved to the upper member 20 by rotating the supply adapter 70 clockwise or counterclockwise. to secure the supply adapter 70 to the check valve assembly 10 .

As shown in FIG. 3, the fitting portion 22 has a first cylindrical body 25 projecting from the rear surface 21a of the circular plate member 21 and a fitting claw 26 projecting from the outer wall 25a of the first cylindrical body 25. . In this embodiment, as shown in FIG. 5, the outer wall 25a of the first cylindrical body 25 has two sets of fitting claws 26a and 26b at opposing positions. In the present embodiment, two sets of fitting claws 26a and 26b are arranged adjacently, but four fitting claws 26a and 26b are arranged on the outer periphery of the first cylindrical body 25 every 90°. may be From the viewpoint of fixing stability, it is preferable that the number of fitting claws 26 is two or more, more preferably that there be at least one set that faces each other, and that there are two or more sets.
Since the upper member 20 is subjected to a pressing pressure when fitting, it has high rigidity, such as polyamide 6, composite material of polyamide 6 and glass fiber, acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate ( PC), mixed resin of polycarbonate and acrylonitrile-butadiene-styrene (PC/ABS), polyacetal (POM), polysulfone, polyamide 66 (PA66), polybutylene terephthalate (PBT), or those made of glass fiber reinforced grade, Polyamide 6 and a composite material of polyamide 6 and glass fiber are more preferred.

(Check valve)
The check valve 30 has a body portion 31 having a slit 33 at its lower end 31b and an upper end flange portion 34, as shown in FIGS. As shown in FIG. 9, the upper end flange portion 34 is provided on the upper end 31a of the body portion 31 and has an opening 32 in the center. The opening 32 is a region into which the supply adapter 70 is inserted from above when the check valve assembly 10 is formed.
As shown in FIG. 7, when viewed from a direction perpendicular to the slit 33, the main body 31 has vertical side surfaces at both ends, and has a cylindrical shape except for inclined side walls 35, which will be described later. As shown in FIG. 8, the main body 31 has two inclined side walls 35 that are inclined from the upper end 31a to the lower end 31b of the main body 31 when viewed from one end of the slit 33 in the longitudinal direction. As shown in FIG. 9, sloping sidewalls 35 define sidewalls 36 of slit 33 at lower end 31b such that sidewalls 36 press together to close slit 33 when supply adapter 70 is not inserted.

As shown in FIG. 9, the angle θ formed by the two inclined side walls 35 is preferably 45° or more and 90° or less, more preferably 50° or more and 70° or less. When the angle θ is 45° or more and 90° or less, the height h31 of the body portion ₃₁ can be reduced, and the overall height of the check valve assembly 10 can be reduced. When the valve assembly 10 is mounted on a catheter, the thickness of the funnel can be reduced. Further, by setting the angle within the above range, even after repeated use of the slit 33, the side wall 36 at the lower end 31b allows the slit 33 to easily return and prevent backflow without providing a pressure-applying member.

The height h31 of the body portion ₃₁ is preferably 4.0 mm or more and 7.0 mm or less, more preferably 4.8 mm or more and 5.5 mm or less. Here, the height h31 of the body portion ₃₁ means the vertical distance from the upper end 31a of the body portion 31 to the lower end 31b of the body portion 31, as shown in FIG.

Also, the thickness t ₃₅ of the two inclined side walls 35 may be uniform or non-uniform from the upper end 31a to the lower end 31b of the body portion 31, and may be thicker toward the lower end 31b. If the thickness is uniform, the manufacturing process can be simplified, so that the cost can be reduced.
The thickness t35 of the inclined side wall ₃₅ is preferably in the range of 800 μm or more and 1500 μm or less from the viewpoint of durability against pressure when the supply adapter 70 is inserted and the ease of returning the slit 33, and is preferably 900 μm. More preferably, it is in the range of 1200 μm or more.
In particular, by adjusting the angle θ formed by the two inclined side walls 35 and the thickness t ₃₅ of the inclined side walls 35, the return of the slit 33 can be further improved.

The check valve 30 is preferably made of silicone rubber having a hardness of 35 or more and 55 or less from the viewpoint of durability against pressure when the supply adapter is inserted and the ease of returning the slit 33 .

(lower member)
The lower member 40 has a second cylindrical body 41 and a side wall flange portion 42 provided on the outer circumference of the second cylindrical body 41, as shown in FIG. In this embodiment, the second cylindrical body 41 is composed of an upper second cylindrical body 41a and a lower second cylindrical body 41b having different outer diameters, but it may be a cylindrical body having a constant outer diameter. It is not limited to the embodiment.
The upper second cylindrical body 41 a has two pairs of fitting holes 43 ( 43 a, 43 b ) provided at positions corresponding to the two pairs of fitting claws 26 ( 26 a, 26 b ) of the upper member 20 . Since the fitting holes 43 ( 43 a , 43 b ) are provided at positions corresponding to the upper second cylindrical body 41 a , they are provided according to the number of the fitting claws 26 of the upper member 20 .

As shown in FIG. 11, the inner wall of the upper second cylindrical body 41a is provided with a locking portion 44 for locking the upper end flange portion 34 of the check valve 30. As shown in FIG. In the check valve 30, the upper end flange portion 34 of the check valve 30 is locked by the locking portion 44, and is sandwiched between the locking portion 44 and the bottom surface 27 of the first cylindrical body 25 of the upper member 20. . The inner diameter d _41a of the upper second cylindrical body 41a is the outer diameter D ₂₅ of the first cylindrical body 25 of the upper member 20 (see Fig. 3 ) or more.

As shown in FIGS. 10 and 12, the side wall flange portion 42 may be provided with a rectangular second notch portion 45 at its end portion. By having the second notch 45, if an adhesive (not shown) flows into the second notch 45, for example, when attaching to the funnel portion 51 of the balloon catheter 50 shown in FIG. 10 can be adhered well. Specifically, referring to FIG. 13 , when the check valve assembly 10 of the present invention is attached to the funnel portion 51 of the balloon catheter 50 , there is a gap between the funnel portion 51 and the check valve assembly 10 . As a result, a gap 61 is created between the upper member 20 and the side wall flange portion 42 . By pouring the adhesive into the gap 61 , the adhesive flows from the second cutout portion 45 to the pedestal portion 59 of the funnel portion 51 , and finally the entire gap 61 is filled with the adhesive. As a result, the adhesive is interposed from the upper member 20 to the pedestal portion 59 through the gap 61 , and the check valve assembly 10 is firmly adhered to the funnel portion 51 .
Although the second notch 45 has a rectangular shape in this embodiment, it is not limited to a rectangular shape, and may have a semicircular or semielliptical shape. Moreover, at least one hole may be provided instead of the notch. The number of holes is selected in consideration of the strength of the side wall flange portion 42 and the type and viscosity of the adhesive.

The check valve assembly 10 of the present invention may have a third notch 46 at the lower end 41c of the lower second cylindrical body 41b, as shown in FIG. Having the third notch 46 increases the design flexibility of the catheter. This will be explained with reference to FIGS. 2, 13 and 14. FIG. 14 is an enlarged view of the vicinity of the third notch portion in FIG. 13. FIG. As shown in FIG. 13 , the balloon catheter 50 is provided with a second lumen 57 through which air, physiological saline, distilled water, or the like is injected into or discharged from the balloon 53 . Since the second lumen 57 is pressurized with air, physiological saline, distilled water, or the like, it is necessary to secure a sufficient thickness of the partition wall 60 . On the other hand, the lower second cylindrical body 41b of the check valve 30 has a certain length in order to support the inclined side wall 35 of the check valve 30 when the supply adapter 70 is inserted into the slit 33 of the check valve 30. is necessary. Then, the partition wall 60 has no choice but to retreat from the lower second cylindrical body 41b (toward the right side of the paper surface), and the funnel portion 51 becomes large.
However, by providing the third notch 46 , it is possible to bring the second lumen 57 closer to the catheter main body 52 while ensuring the thickness of the partition wall 60 . That is, it is possible to make the funnel portion 51 exposed to the patient's body surface smaller and thinner.

In the check valve assembly 10, as shown in FIG. 11, the sizes of the lower member 40 and the check valve 30 are adjusted so that the slit 33 of the check valve 30 is exposed downward from the lower end of the lower member 40. may be By doing so, the thickness of the funnel portion 51 (see FIG. 13) can be reduced.

In the check valve assembly 10 of the present invention, the upper member 20 and the lower member 40 are fitted together by the fitting claws 26 (26a, 26b) and the fitting holes 43 (43a, 43b). The upper member 20 and the lower member 40 can be fixed stably. In the prior art, the upper member and the lower member are adhered with an adhesive, but according to the present invention, no adhesive is used, so the check valve assembly 10 can be manufactured with a simple manufacturing process. .
In addition, the check valve 30 is sandwiched between the upper member 20 and the lower member 40 at the locking portion 44, and the upper member 20 and the lower member 40 are firmly fixed by the fitting portion 22 as described above. Therefore, it is possible to provide a high-quality check valve assembly 10 that does not come off even when used multiple times.

[Balloon catheter]
The check valve assembly 10 of the present invention can be used in various medical catheters, lavage devices, endoscopic devices, and the like.
A balloon catheter 50 as an embodiment of a catheter using the check valve assembly 10 of the present invention will be described below with reference to FIGS. 13 and 14. FIG.
As shown in FIG. 13, the balloon catheter 50 consists of a funnel portion 51 and a catheter body portion 52 . The check valve assembly 10 of the present invention is attached to the head of the funnel portion 51 . The catheter body 52 has a first lumen 56 and a second lumen 57 inside. The first lumen 56 is a passageway through which a supply adapter 70 (see FIG. 2) is inserted into the opening 23 of the upper member 20 of the check valve assembly 10 to inject nutrients or medicines into the patient. Also, the second lumen 57 is a passage for injecting or discharging air, physiological saline, distilled water, or the like into or from the balloon 53 . Injection and ejection of air, physiological saline, distilled water, or the like are performed by an injection and ejection device 58 provided in the funnel portion 51 .

The funnel portion 51 is provided with a cap 55 on an extending belt 54 . The opening of the check valve assembly 10 is closed by the cap 55 when the nutrient or the like is not supplied from the check valve assembly 10 .

Since the balloon catheter 50 of this embodiment uses the check valve assembly 10 of the present invention, it is easy to attach the check valve assembly 10 to the funnel portion 51 . Also, the backflow valve preventive body 10 is firmly adhered to the funnel portion 51 by the adhesive poured into the gap 61 .
Further, as described above, when using the check valve assembly 10 provided with the third notch portion 46, it is necessary to pay attention to the mounting direction to the funnel portion 51. By aligning the position of the cutout portion 24 and the position of the fitting claw 26 with the position of the third cutout portion 46, it is easy to mount the check valve in the correct position, and workability is also improved.

REFERENCE SIGNS LIST 10 check valve assembly 20 upper member 21 plate-like member 21a rear surface 22 fitting portion 23 circular opening 24 first notch portion 25 first cylindrical body 25a outer wall 26, 26a, 26b fitting claw 27 bottom surface 30 check valve 31 Body portion 31a Upper end 31b Lower end 32 Opening 33 Slit 34 Upper end flange 35 Inclined side wall 36 Side wall 40 Lower member 41 Second cylindrical body 41a Upper second cylindrical body 41b Lower third Two cylinders 41c Lower end 42 Side wall flange 43, 43a, 43b Fitting hole 44 Locking part 45 Second notch 46 Third notch 50 Balloon catheter 51 Funnel 52 Catheter body 53 Balloon 54 Belt 55 Cap 56 First Lumen 57 Second lumen 58 Injection and discharge device 59 Pedestal 60 Separation wall 61 Gap 70 Supply adapter 71 Projection h ₃₁ Height of main body t ₃₅ Thickness of inclined side wall

Claims (6)

A check valve assembly comprising an upper member, a check valve, and a lower member, wherein the check valve is sandwiched between the upper member and the lower member,
The upper member has a plate-like member and a fitting portion provided on the back surface of the plate-like member for fixing the upper member to the lower member,
The plate-shaped member has a circular opening provided in the center and a first notch provided at the end of the circular opening,
The fitting portion has a first cylindrical body projecting from the back surface of the plate-like member and a fitting claw projecting from the outer wall of the first cylindrical body,
The check valve has a main body portion with a slit at the lower end and an upper end flange portion,
The lower member has a second cylindrical body and a side wall flange provided on the outer periphery of the second cylindrical body, and the side wall of the second cylindrical body is fitted with the fitting claw of the upper member. a fitting hole is provided, and a locking portion for locking the upper end flange portion of the check valve is provided on the inner wall of the second cylindrical body,
A check valve assembly in which an upper end flange portion of the check valve is sandwiched between the locking portion and the bottom surface of the first cylindrical body of the upper member. 2. The check valve assembly according to claim 1, wherein at least one set of said fitting claws is provided at opposing positions on the outer wall of said first cylindrical body. 3. A non-return valve assembly according to claim 1 or 2, wherein at least one hole or second notch is provided at the end of said side wall flange. 4. The check valve assembly according to any one of claims 1 to 3, wherein said upper member and said lower member are made of polyamide 6 or a composite material of polyamide 6 and glass fiber. 5. The check valve assembly according to any one of claims 1 to 4, wherein the lower end of the second cylindrical body of the lower member has a third notch. 6. The check valve assembly according to any one of claims 1 to 5, wherein the slit of the check valve is exposed downward from the lower end of the lower member.

Images