JPH07136285A - Hemostatic valve for catheter introducer - Google Patents

Abstract

PURPOSE:To provide the hemostatic valve which surely prevents leaking out of blood and has excellent operability by providing the conical recessed part at the flank of a rear end with a small hole at its center and providing the front flank on the opposite side with a projecting part larger than the small hole at the same center as the center of this small hole and forming plural pieces of slits extending radially from its center. CONSTITUTION:This hemostatic valve 3 is provided with the recessed part 6 to permit easy insertion of a catheter, etc., on the surface exposed on the rear end side of the introducer and is provided with the small hole 4 of the diameter smaller than the diameter of a guide wire at its center. The surface on the front side on the opposite side thereof is provided with the projecting part 7 larger than the small hole 4 at the same center as the center of the small hole 4. Plural pieces of the slits 5 extending radially in a radial direction from its center are formed. The site of the slit 5 of the hemostatic valve 3 is pushed and opened toward the front side to generate a small clearance when the catheter 22 is inserted from an opening end 20 in the rear part of the introducer. The rubber-like elastic body of the hemostatic valve 3 comes into tight contact with the catheter, thus preventing the leakage of the blood.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hemostatic valve for a catheter introducer used when introducing medical tubing such as a catheter into a living body lumen, particularly into a blood vessel.

[0002]

2. Description of the Related Art For the purpose of diagnosis or treatment, for example, a blood vessel balloon catheter, an angiography catheter, or temperature, p
When introducing a catheter with a sensor for detecting H, oxygen, etc. into a blood vessel, extremely careful, safe and reliable treatment operation is required.

Usually, as a procedure for percutaneously introducing a blood vessel catheter into a blood vessel, first, a guide wire is inserted into the blood vessel by the Selsinger method, and then a catheter introducer combined with a dilator is guided along the guide wire. After the dilator and guide wire are removed, the tip of the introducer remains, and a catheter is inserted into the blood vessel along the guide of the introducer.

In this process, as shown in FIG. 2, a catheter (22) inserted into a blood vessel is introduced from a rear end opening (20) of an introducer through a sheath tube (21) provided on the distal side. Operate at hand (twist, push,
The introducer incorporates a hemostasis valve (3) in order to prevent the blood from leaking in the process of pulling it to the target site. And in this hemostasis valve,
It is required that blood does not leak not only during the operation of the guide wire or the catheter but also after the catheter is pulled out, and that the operability of inserting the catheter is smooth.

On the other hand, the conventional hemostasis valve is shown in FIG.
As shown in b), there is a small hole (4) with a diameter slightly smaller than the guide wire on the rear end side (left side in the figure) to prevent leakage of blood at the time of inserting the guide wire or the catheter, and at the front side (in the figure). A plurality of slits (5) are provided on the right side, and the flap mechanism prevents blood from leaking when not inserted. However, since the blood pressure applied to the housing, especially the arterial pressure, is applied vertically to the hemostasis valve, the thickness of the slit portion should be 0.5 mm or more in order to prevent blood leakage when the flap mechanism is not inserted. Need catheter (2
The resistance with 2) was large, and the insertion operability was not smooth.

[0006] In order to solve such a problem, the actual flat 4
According to Japanese Laid-Open Patent Publication No. -13156, a rib (23) is provided on the front surface as shown in FIGS. 3 (c, d) to reduce the contact area with the insertion catheter and improve the insertion operability. Is similarly thick, and the resistance is small at the small hole portion when the catheter is inserted, but the resistance at the time of passing through the slit portion is large, and the problem cannot be solved sufficiently.

[0007]

DISCLOSURE OF THE INVENTION The present invention reliably prevents leakage of blood when inserting a medical tube such as a catheter into a blood vessel through a catheter introducer, and at the same time, improves the operability of the medical tube. Another object of the present invention is to provide an excellent hemostasis valve for a catheter introducer.

[0008]

Means for Solving the Problems That is, the present invention is a hemostatic valve disposed in an introducer for introducing a catheter into a living body lumen, which comprises a plate-like rubber-like elastic body, A mortar-shaped recess is provided on the end side surface, and a small hole is provided at the center of the recess, and a convex portion larger than at least the small hole and having the same center as the small hole is provided on the opposite front side surface. The hemostatic valve for a catheter introducer is characterized in that a plurality of slits extending radially from its center are formed.

A hemostatic valve for a catheter introducer according to an embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 (a) and 2, a hemostasis valve (3) according to the present invention comprises a body part (1) which constitutes a housing of an introducer and a cap part (2) which is located on the rear end side. Used by being sandwiched and fixed between
It functions to maintain a liquid-sealed state with a medical tube or guide wire such as a catheter that has been inserted. Silicone rubber is suitable as the material of the rubber-like elastic body forming the hemostasis valve, but medical safety silicone rubber made of dimethylpolysiloxane is particularly preferable from the viewpoint of safety.

The hemostatic valve (3) according to the present invention is shown in FIG.
As shown in FIG. 6, a mortar-shaped recess (6) is provided on the surface exposed at the rear end side of the introducer so that a catheter or the like can be easily inserted, and the commonly used φ0. A small hole (4) having a diameter smaller than that of the guide wire of 9 mm, preferably φ0.8 mm, is provided. Further, a convex portion (7) larger than at least the small hole (4) and having the same center as the small hole (4) is provided on the front surface on the opposite side, and extends radially from the center thereof. A plurality of slits (5) are formed. It is desirable that the number of slits (5) be three, because it is excellent in hemostasis and is not limited to this. The shape of the hemostasis valve (3) is usually disc-shaped, and the rear end side surface and the front side surface may be molded separately and laminated, but it is easier to assemble them if they are made as an integrally molded product, which is cost effective. Is also advantageous.

The shape of the convex portion (7) is, in addition to the circular shape having a trapezoidal cross section as shown in FIGS. 1 (a) and 1 (b), a triangular trapezoidal shape (FIG. 1c), a Y-shape (FIG. 1d), and a cylinder. The shape (FIG. 1e) in which a circular convex portion is provided in the concave portion may be used.

[0012]

The hemostatic valve (3) is connected to the catheter (2) from the rear open end (20) of the introducer as shown in FIG.
When 2) is inserted, the slit portion is pushed open toward the front side to form a small gap, but the rubber-like elastic body of the hemostasis valve is brought into close contact with the catheter to prevent blood leakage.
On the other hand, blood flows into the lumen of the introducer through the gap between the sheath tube (21) and the catheter (22), and as described above, the slit (5) of the hemostatic valve (3). Vertical pressure is also applied from the side surface of the convex portion (7) surrounding the slit (5) and works in the direction of closing the slit (5). Therefore, the protrusion (7) can be firmly fitted not only when the catheter is inserted, but also when the catheter is removed, so that blood leakage can be prevented, so that the thickness of the hemostasis valve (3) (excluding the protrusion) is 0. ．
The thickness can be made as thin as 5 mm or less, and the slit (5) is easily opened when the catheter is inserted, so that the catheter can be operated smoothly. The shape of the convex portion (7) is
As long as blood pressure is applied in the direction of closing the slit (5) in this way, a projection type surrounding the slit as shown in FIGS. 1 (a) to 1 (d) may be used, or a groove type as shown in (e) may be used. The effect of is obtained.

[0013]

As described above, the hemostatic valve for a catheter introducer according to the present invention is thin because the blood pressure acts on the convex portion located in the introducer in the direction in which the blood pressure tries to close the slit. in spite of,
Highly hemostatic, smooth insertion of medical tube, and safe by using this introducer.
A medical tube such as a catheter can be surely inserted.

[Brief description of drawings]

1A and 1B are views showing a hemostatic valve for an introducer according to an embodiment of the present invention, in which FIG. 1A is a cross-sectional view of a state where the hemostatic valve is incorporated in an introducer, and FIG. 1B is the right side of the hemostatic valve in FIG. The surface views and (c) to (e) are perspective views showing another embodiment.

FIG. 2 is a cross-sectional view showing a state in which a catheter is inserted through the introducer.

FIG. 3 is a diagram showing a conventional hemostasis valve.

[Explanation of symbols]

 1 Body Part 2 Cap Part 3 Hemostasis Valve 4 Small Hole 5 Slit 6 Recess 7 Convex 20 Rear Open End 21 Sheath Tube 22 Catheter 23 Rib

Claims (2)

[Claims] 1. A hemostasis valve arranged in an introducer for introducing a catheter into a body lumen, comprising:
It is made of a plate-shaped rubber-like elastic body, and has a recess formed in the shape of a mortar on the rear end side surface, and has a small hole at the center of the recess, and the same hole and center are formed on the opposite front side surface. A hemostasis valve for a catheter introducer having a convex portion larger than at least a small hole, and a plurality of slits extending radially from the center thereof are formed. 2. The hemostasis valve for a catheter introducer according to claim 1, wherein the plate-like rubber-like elastic body is a laminate of a plurality of plate-like bodies.