JPH0683041U - Catheter introducer - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain the lubrication function without applying silicone grease or silicone oil to the central push-out type check valve provided in the communication passage that penetrates through the proximal end portion of the sheath. [Structure] The check valve 11 is coated with a hydrophilic polymer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a catheter introducer in which a tube of a sheath is previously inserted into a blood vessel in order to insert the angiographic catheter into the blood vessel.

[0002]

[Prior art]

 As is well known, the catheter introducer is designed to insert a dilator thin tube with a sharp tip into the sheath tube, pierce the tube with the tip of the thin tube protruding into the skin, and insert the tube into the blood vessel. . In such a catheter introducer, a check valve for preventing the outflow of blood is provided in the communication passage that penetrates through the proximal end portion of the sheath, and the check valve includes a thin tube or an angiography catheter. Silicone grease or silicone oil is applied as a lubricant for smooth penetration.

[0003]

[Problems to be solved by the device]

 Silicone grease and silicone oil, which are used as lubricants, lose their lubrication function when the amount of application is drastically reduced when the capillary tube is inserted and removed at the time of setting and the operation of passing the angiographic catheter is repeated 2-3 times. Although silicone grease and silicone oil are said to be harmless, it is not preferable that the silicone grease and silicone oil adhering to the tubule or angiography catheter flow into the body when passing through the check valve.

[0004]

[Means for Solving the Problems]

 The present invention is a catheter introducer devised in view of the above-mentioned deficiencies occurring in the conventional catheter introducer, which has a structure in which a central push type is spread in a communication passage penetrating the inside of a proximal end joint portion of a sheath. The non-return valve is provided and the non-return valve is coated with a hydrophilic polymer.

[0005]

[Action]

 Wetting of the hydrophilic polymer coated surface makes it possible to smoothly slide the capillary tube and angiography catheter of the dilator into and out of the check valve of the sheath. Also, since no silicone oil is used, there is no risk of foreign matter entering.

[0006]

【Example】

 A catheter introducer according to the present invention will be described with reference to the drawings. Reference numeral 1 is a sheath, and 2 is a dilator. The sheath 1 is integrally formed with a joint portion 4 at the base end of a tube 3 and coaxially with the tube 3, and the dilator 2 is integrally formed with a joint portion 6 at the base end of a thin tube 5. Is provided for the purpose. The joint portion 4 of the sheath 1 is configured to be thin in three steps, such as large, medium and small diameter portions, and a thin tube 3 is connected to the tip of the small diameter portion 4a. An introduction path 7 communicating from 3 to the open rear end portion is provided. The large diameter portion 4b is provided with a joint 8 for connecting a tube for collecting blood and injecting a drug, and a tube 10 having a three-way switching valve 9 at its tip is connected. In addition, a check valve 11 is built inside the rear end opening in the introduction path 7 of the large diameter portion 4b. The check valve 11 is provided at the position shown in FIG. 2 and is highly elastic. The valve is a valve that has a Y-shaped notch in the center of an elliptical thin plate and is a center push type valve, and a valve that has a small hole in the center of the thin disk. Has a polymer coating. Then, the capillary tube 5 of the dilator 2 and the angiography catheter can be inserted into the tube 3 from the check valve 11. Further, the large-diameter portion 4b is provided with engaging protrusions 12.12 at positions facing the outer peripheral surface.

On the other hand, the joint portion 6 of the dilator 2 is formed in a cap shape that can be externally fitted to the joint portion 4 of the sheath 1, a thin tube 5 penetrates through the center of the cap shape, and a nipple-shaped port is formed in the rear. 13 is opened, and the guide wire can be inserted from the inside of the thin tube 5 into the opening. In addition, a slit 14 in which an introduction portion 14a parallel to the axis and an engagement portion 14b extending in a direction orthogonal to the introduction portion 14a are continuous in an L-shape is provided at a portion facing the circumferential surface from the tip opening side. Has been formed.

The tip of the tube 3 of the sheath 1 is slightly squeezed, and is formed thinner toward the tip. On the other hand, at the tip of the thin tube 5 of the dilator 2, a concave groove 15 having a depth corresponding to the thickness of the tip of the tube 3 is provided around the boundary between the conical portion 5a and the thin tube portion 5b. Has the same diameter as the thin tube 5. The catheter introducer thus formed wets the thin tube, the angiographic catheter or the check valve when inserting the thin tube 5 of the dilator 2 or the angiographic catheter into the communication passage 7 of the joint portion 4 of the sheath 1. As a result, the non-stick valve 11 can easily pass through the check valve 11 due to the good sliding property of the hydrophilic polymer, and it is not necessary to apply silicone oil. Even when it is inserted into the tube 3, the maximum diameter portion of the conical portion 5a can be smoothly inserted by making it the same as or smaller than the inner diameter of the tube 5.

When the tip of the conical portion 5 a of the dilator 2 is exposed from the tip of the tube 3 of the sheath 1 and the joint portion 6 of the dilator 2 abuts on the engaging projection 12, the engaging projection 12 and the slit 14 have cut-out openings. And the engaging projections 12 are inserted straight into the slits 14 and fitted, and when the conical portion 5a of the dilator 2 is completely extended from the tip of the tube 3, the two are securely locked. This locked state can be confirmed from the position of the engaging protrusion, and the visibility is further enhanced by color-coding the engaging protrusion. In the locked state, the base end of the protruding conical portion 5a is continuous with the front end of the tube 3 having the tapered shape as shown in FIG. 4, and can puncture the skin without resistance.

In the catheter introducer of the present embodiment, the lock of the joint is locked by the locking claw and the L-shaped slit, but a screwing type or a fitting type which has been widely used in the past may be used. Further, the tip shape of the thin tube is not limited to the embodiment.

The check valve according to the present invention has a two-layer structure in which a Y-shaped notch is provided in the center of the disc-shaped thin plate and a small hole is provided in the center of the disc-shaped thin plate. The structure can be set freely as long as the center is expanded by piercing a thin tube, a catheter, or an angiography catheter.

[0012]

[Effect of device]

 According to the present invention, the lubricating function is not lost even if the thin tube and the catheter are repeatedly passed through a plurality of times, and it is not necessary to apply silicone grease or silicone oil, so that the silicone substance can be introduced into the body. It is completely prevented and contributes considerably to the success rate of surgery.

[Brief description of drawings]

FIG. 1 shows a catheter introducer according to the present invention,
It is explanatory drawing which isolate | separated into the sheath and the dilator.

FIG. 2 is an explanatory view showing a check valve.

FIG. 3 is an explanatory diagram showing a state in which a sheath and a dilator are combined.

FIG. 4 is an explanatory view showing a state in which a conical portion is headed out from the tip of the tube.

[Explanation of symbols]

1 ... Sheath, 2 ... Dilator, 3 ... Tube, 4
..Joint part, 4a..Large diameter part, 4b..small diameter part,
5 ・ ・ Narrow tube, 5a ・ ・ Cone shaped part, 5b ・ ・ Narrow tube part, 6 ・
・ Joint part, 7 ・ ・ Introduction path, 8 ・ ・ Joint, 9 ・ ・ 3-way switching valve, 10 ・ ・ Tube, 11 ・ ・ Check valve, 1
2 ... Engaging projections, 13 ... Ports, 14 ... Slits,
14a ... Introducing part, 14b ... Engaging part, 15 ... Recessed groove.

Claims (1)

[Scope of utility model registration request] 1. A catheter introducer in which a check valve of the center-spreading type is provided in a communication passage that penetrates through a proximal end portion of a sheath, and the check valve is coated with a hydrophilic polymer.