JP2564223Y2 - Valve body - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body, and more particularly to an improvement of a medical valve body provided in an introducer such as a catheter and a guide aid for guiding them into a living vessel such as a blood vessel.

[0002]

2. Description of the Related Art In general, when a medical catheter or the like is introduced into a blood vessel, a guide aid for guiding the catheter or the like is used. The guide aid includes, for example, a tubular dilator having a sharp tip, and a tubular sheath into which the dilator is integrally inserted with the tip exposed. In a method of introducing a catheter into a blood vessel using this guide aid, first, a hollow needle having an inner needle inserted therein is punctured and introduced into the blood vessel. Next, the inner needle is removed from the hollow needle, and a guide wire is inserted into the hollow needle. Subsequently, the hollow needle is removed, leaving only the guidewire.

After that, while inserting the guide wire through the dilator, the sheath together with the dilator is inserted into the blood vessel by the guide of the guide wire. Next, both the dilator and the guide wire are removed from the sheath, leaving only the sheath. Then, the catheter is passed through the sheath and inserted into the blood vessel.

[0004] In the above-described guide aid, when only the sheath is left in communication with the blood vessel or when a catheter is inserted through the sheath, blood passes through the inside of the sheath and externally. May be leaked. In order to prevent this, the sheath is provided with a valve body.

Conventionally, this type of valve body C is provided at the base of a sheath, and as shown in FIG. 5A, a tubular member made of the same material is provided on one side surface of a substrate portion 50 made of a soft elastic material. An introduction portion 51 is formed. A cut 52 is formed at the tip of the introduction portion 51. The cut 52 can be opened and closed freely by the elasticity of the material.

[0006] For example, when a sheath (not shown) provided with the valve body C remains in communication with the blood vessel,
As shown in FIG. 5B, the cut 52 is in a state of close contact. Further, as shown in FIG.
When the catheter 53 is inserted through the
2 closely adheres to the outer surface of the catheter 53 to prevent the outflow of blood.

[0007] However, when only the sheath remains in communication with the blood vessel, no closing force is applied to the cut 52, and blood may flow out from the cut 52. Further, when a dilator, a guide wire 54, or the like having an outer diameter smaller than that of the catheter 53 is inserted through the cut 52, or when a portion having a relatively small outer diameter at the distal end of the catheter 53 passes through the cut 52, FIG. As shown in d), a gap 55 is formed at both ends of the cut 52.
Is formed, there is a disadvantage that blood flows out from the gap 55. Further, the cut 52 has a relatively weak strength at both ends 52a and 52b due to the above-described structure.
There is a disadvantage that cracks occur in a and 52b and they are cheap.

[0008] In addition, a valve element as disclosed in Japanese Patent Publication No. 2-949 is known. This valve element D is shown in FIG.
As shown in (a) and (b), a first cut 57 is formed in the block 56 of the flexible elastic material from one side surface to a middle position in the thickness direction, and a middle position in the thickness direction from the other side surface. A second cut 58 is formed up to this point.
The first cut 57 and the second cut 58 are provided orthogonally to each other, and both cuts 57 and 58 are formed in the block 56 so that a part of the cuts 57 and 58 partially cross each other.

Thus, for example, the two cuts 57 and 58 intersecting each other increase the degree of close contact with each other, and enter a closed state. When a catheter or a guide wire having an outer diameter smaller than that of the catheter is inserted through the cuts 57 and 58, even if gaps are formed at both ends of the cuts 57 and 58, the cuts 57 and 58 are mutually connected. Since they are formed orthogonally, the gap formed in the first cut 57 is closed by the second cut 58 so as to be in close contact with the outer surface of the catheter to prevent blood from flowing out.

However, since the closing force is not normally applied to the cuts 57 and 58 as in the case of the cut 52 of the valve body C, there is a possibility that blood flows out so as to be oozed. Further, since the respective structures of both cuts 57 and 58 are similar to the cut 52 of the valve body C described above, both ends 57 are formed.
A, 57b, 58a, and 58b are relatively weak in strength, and the inconvenience that cracks are likely to be generated at both ends of both cuts 57, 58 while the catheter is inserted and removed has not been solved.

[0011]

[Problem to be solved by the invention] By solving such inconvenience, the present invention closes with the closing force always applied,
It is an object of the present invention to provide a valve having a highly durable structure that can be tightly attached to the outer periphery of a catheter or a guide wire by a closing force even when the catheter or the guide wire is inserted, thereby preventing outflow of blood and the like.

[0012]

In order to achieve the above object, the present invention is directed to a first half made of a soft elastic material, which is provided with an inclination in a gradually converging direction provided on one side of the first half. Is formed integrally by inserting it into a concave portion provided on one side surface of a second half made of a soft elastic material, and the first half has a tip side inside the convex portion. A hollow portion formed by being closed, and a valve portion having a cut formed in the closed portion of the hollow portion, the second half, when the convex portion is inserted into the concave portion, A pressing portion formed on an opening edge side of a concave portion for pressing an outer surface on a base side of the convex portion; and a valve having a gap between an outer surface on a distal end portion side of the convex portion when the valve portion is closed. A restricting portion formed on the bottom side of the concave portion for restricting the valve portion by contacting the outer surface on the distal end side of the convex portion when the portion is opened , Are formed in opposing positions in the inner diameter to the valve of the bottom of the recess, characterized in that it comprises a hole portion freely expand and contract.

[0013]

When the first half and the second half are integrated, the first half
The projection of the half is inserted into the recess of the second half.
Since the concave portion is provided with a pressing portion for pressing the outer surface of the convex portion, the outer surface of the convex portion is pressed by the pressing portion, and the cut portion of the valve portion located at the tip end via the outer surface of the convex portion. Are always biased in the closing direction.

Further, for example, when a catheter, a guide wire, or the like is inserted, an elastic restoring force is generated in a direction in which a cut is pushed and opened by the valve and the valve is closed. , The cut is tightly adhered to the outer surface of the catheter, the guide wire or the like, thereby preventing the generation of a gap.

When the valve portion is pushed open by insertion of a catheter, a guide wire, or the like, the suppressing portion in contact with the outer peripheral surface of the valve portion suppresses a force in the pulling direction applied to both ends of the cut, and To prevent cracks from forming at both ends.

Further, when a catheter or the like is inserted into the hole through the valve portion, an elastic restoring force is generated in a direction in which the inner diameter of the hole is pushed open by the catheter or the like to reduce the diameter. As a result, the hole strongly adheres to the outer surface of the catheter or the like, thereby preventing the generation of a gap.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view of a medical guide aid provided with a valve body of the present invention, FIG. 2 is an explanatory perspective view of the valve body taken apart and partially cut away, and FIG. 3 is a valve body of the present invention. FIG. 4 is an explanatory view showing a state in which a catheter, a guide wire, and the like are inserted through the valve body.

As shown in FIG. 1, the valve element 1 of this embodiment
It is provided in the medical guidance aid A. The guide aid A is generally referred to as an introducer, and is used for guiding a catheter (not shown), a guide wire, and the like to conduct electricity into a living vessel such as a blood vessel.

The guide aid A is provided with a sheath 4, a connector 4 provided at a base thereof and having a side arm 3 communicating with the sheath 2, and a dilator 5 which can be inserted through the sheath 2.
It is composed of Further, as shown in FIG. 1, a guide wire 6 for guiding the sheath 2 and the dilator 5 into a living body tube is freely inserted.

The valve body 1 is fixed to the connector 4 by a cap 7. The cap 7 has an opening 7a
The guide wire 6 is inserted into the sheath 2 via the opening 7a and the valve body 1.

Next, the valve 1 will be described in detail.

As shown in FIG. 2, the valve body 1 has a first half 1a made of a soft elastic material such as silicone rubber.
And the second half 1b.

The first half 1a includes a disk-shaped substrate portion 8;
There is provided a valve section 9 in which a catheter, a guide wire, and the like are formed so as to freely pass through the inside of the substrate section 8. In the substrate part 8,
On one side surface, there is provided a projection 10 that projects with an inclination in a direction that gradually converges. Inside the convex portion 10, a hollow portion 11 whose front end side is closed is formed. At the tip of the convex part 10, a closing part 10c for closing the hollow part 11
Are formed. A cut 12 is formed in the closing portion 10c, and a valve portion 9 that opens and closes the closing portion 10c by the cut 12 is formed.

The second half 1b is provided with a concave portion 13 having a shape corresponding to the convex portion 10 of the first half 1a. The concave portion 13 includes a pressing portion 14 that presses the outer surface of the convex portion 10. The pressing portion 14 is provided with the convex portion 1.
0 is inserted into the recess 13, the base side 10 a of the projection 10
An inclined surface 14a is formed on the inner surface on the opening edge side, which is a position facing the surface, and is gradually inclined along the shape of the outer surface of the convex portion 10 on the entire circumference. Further, the pressing portion 14
Is formed such that its inner diameter is smaller than the outer diameter of the opposing convex part. Thereby, when the convex portion 10 is inserted into the concave portion 13, the pressing portion 14 presses the base side 10 a of the convex portion 10 inward.

The recess 13 has a hole 15 at a position facing the valve portion 9 when the projection 10 is inserted. The hole 15 is formed to be smaller than the outer diameter of a catheter, a guide wire, or the like inserted therein, and the inner diameter expands and contracts due to the elasticity of the material.

Further, when the convex portion 10 is inserted into the concave portion 13, an opening of the valve portion 9 is formed on the inner surface on the bottom side, which is a position facing the outer surface of the tip side 10 b of the convex portion 10. A suppressing part 16 is formed. As shown in FIG. 3, when the cut 12 of the valve portion 9 is closed, the suppressing portion 16 is formed at an interval on the outer surface of the distal end portion 10 b of the convex portion 10. As shown in FIG. 4, when the cut 12 is expanded by insertion of a catheter, a guide wire, or the like x, and the valve portion 9 is opened, as shown in FIG. Contact the side. Thereby, the suppressing portion 16 can suppress the force in the pulling direction applied to both ends of the cut 12, and can prevent the occurrence of cracks at both ends of the cut 12.

The first half 1a formed as described above
As shown in FIG. 3, the second half 1b and the second half 1b are integrally formed by inserting the convex portion 10 of the first half 1a into the concave portion 13 of the second half 1b.

As described above, the valve body 1 integrated with the first half 1a and the second half 1b is, as described above,
Since the pressing portion 14 of the concave portion 13 presses the outer surface of the base portion 10 a of the convex portion 10, the pressing force is reduced by the valve portion 9.
And the gap 12 is urged in the closing direction. Thereby, the valve body 1 is closed in a state where a closing force is constantly applied to the valve portion 9.

Then, for example, as shown in FIG. 4, when a catheter, a guide wire, or the like x is inserted into the valve body 1,
The catheter, the guide wire, and the like x pass through the hollow portion 11 of the first half 1a, push the cut 12 apart, pass through the valve portion 9, and further push the hole 15 of the second half 1b to spread. It is inserted.

At this time, first, the cut 12 is urged in the closing direction by the restoring force generated in the valve portion 9 which has been expanded, and the cut 12 is made of a catheter, a guide wire or the like x.
In close contact with the outer surface of the Further, since the pressing force of the pressing portion 14 is applied to the valve portion 9, the valve portion 9 is more strongly adhered to the outer surface of the catheter, the guide wire, or the like x. As a result, a gap is prevented from occurring at a contact portion between the outer surface of the catheter, the guide wire, or the like x and the cut 12.

When the valve portion 9 is opened, the restraining portion 16 abuts on the outer surface of the tip portion 10b of the convex portion 10 so that the cut 1
The force in the pulling direction applied to both ends of 2 is suppressed. Thereby, even if the catheter or the guide wire x is frequently inserted and removed, the occurrence of cracks at both ends of the cut 12 is prevented, so that the durability is high.

Then, the hole 15 of the second half 1b which is pushed and expanded by the insertion of a catheter, a guide wire or the like x.
As a result, a restoring force is generated in the direction in which the diameter is reduced, so that a close contact is made with the outer surface of the catheter, guide wire, or the like x, thereby preventing generation of a gap.

[0034]

As is apparent from the above description, the valve body of the present invention, when not inserted, has the outer surface of the convex portion of the first half by the pressing portion of the second half. Is pressed, it can be closed in a state where a closing force is always applied.

Further, for example, when a catheter, a guide wire, or the like is inserted, the outer surface of the convex portion is pressed by the pressing portion as described above together with the restoring force of the cut portion of the valve portion that has been expanded. Further, the blood can be prevented from leaking out by tightly adhering to the outer surface of the catheter, the guide wire, or the like.

At this time, the valve portion pushed and spread by the catheter, the guide wire, and the like is suppressed in the opening direction by the suppressing portion, so that even if the valve portion is formed by a cut,
Since cracks can be prevented from occurring at both ends of the cut,
High durability can be obtained.

Further, when the catheter or the guide wire is inserted, the diameter of the hole is reduced by the restoring force and the hole comes into close contact with the outer surface of the catheter or the guide wire, so that the outflow of blood can be reliably prevented. it can.

Therefore, according to the present invention, it is possible to close with a closing force applied at all times, and to close the outer periphery of the catheter or guide wire with the closing force even when the catheter or guide wire is inserted, thereby preventing outflow of blood or the like. It is possible to provide a valve body having a highly durable structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view of a medical guide aid provided with a valve body of the present invention.

FIG. 2 is an explanatory exploded perspective view of the valve body viewed from a half cross section.

FIG. 3 is an explanatory view showing the valve body of the present invention in a sectional view.

FIG. 4 is an explanatory diagram showing a state in which a catheter, a guide wire, and the like are inserted through a valve body.

FIG. 5 is an explanatory view showing a conventional valve element.

FIG. 6 is an explanatory view showing another conventional valve body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve element, 1a ... 1st half, 1b ... 2nd half, 9 ...
Valve part, 10 ... convex part, 10c ... closing part, 11 ... hollow part, 1
2 ... cut, 13 ... recess, 14 ... pressing part, 15 ... hole,
16 ... Suppression unit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A projection provided on one side surface of a first half made of a soft elastic material and projecting with an inclination in a gradually converging direction, is provided on a side surface of a second half made of a soft elastic material. The first half is integrally formed by being inserted into a concave portion provided on one side surface, and the first half has a hollow portion formed by closing a tip side inside the convex portion, and a closing portion of the hollow portion. The second half, when the convex portion is inserted into the concave portion, on the opening edge side of the concave portion that presses the outer surface on the base side of the convex portion. There is a gap between the formed pressing portion and the outer surface on the distal end side of the convex portion when the valve portion is closed, and the outer surface on the distal end portion side of the convex portion when the valve portion is open. A suppressing portion formed on the bottom side of the concave portion that contacts and suppresses the valve portion, and a suppressing portion formed at a position opposite to the valve portion on the bottom portion of the concave portion. Valve body diameter, characterized in that it comprises a hole portion freely expand and contract.