JPH07308293A - Catheter - Google Patents

Abstract

PURPOSE:To provide a catheter which can be used in such a way that the tip of its body may be prevented from touching blood vessels and blood vessels may not be subjected to spasm shrinkage when the catheter is inserted into any vessel of a human body and made to proceed through blood vessels following a blood flow. CONSTITUTION:A baloon 25 is attached to the total head 11a white having none of its part unattached thereto without avoiding the holes on the peripheral side part of the head part of a catheter body 11, and made expand forward from the head 11a, by making blood flow in from the opening 12 of the head 11a of the catheter body 11 to measure the blood pressure without drilling any hole for receiving pressure in the peripheral side part of the head part of the catheter body 11. Thereby, the head part 11a of the catheter body 11 can be prevented from projecting forward beyond the baloons 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter having a balloon at its tip.

[0002]

2. Description of the Related Art Conventionally, this type of catheter has been used for measuring the intracardiac pressure and the pulmonary artery pressure of the human body. Figure 6
Shows a conventional configuration of this catheter, in which a hole 2 is formed on the peripheral side of the distal end of a catheter body 1 made of a thin tube having a diameter of several [mm] and having an interior partitioned into a plurality of lumens. The pressure sensor 4 is arranged together with the signal line 5 in the lumen 3 facing with, and the tip end opening of the lumen 3 is sealed by the silicone rubber 6. Further, a balloon 7 is attached to the tip of the catheter body 1 at the rear of the hole 2 while avoiding the hole 2.

With this construction, when in use, the catheter body 1 is inserted from the distal end portion into the blood vessel (vein) of the human body together with the atrophied balloon 7, and the balloon 7 is inflated by the air sent through another lumen, and the inside of the blood vessel is expanded. The blood flow through it reaches the heart and lungs. Then, in this state, the pressure of the blood flowing in from the hole 2 is received by the pressure sensor 4, and the pressure (intracardiac pressure, pulmonary artery pressure, etc.) is measured through the signal line 5.

[0004]

In the case of the above-mentioned conventional device, since the balloon 7 is attached to the rear of the catheter body 1 while avoiding the hole 2, the tip 1a of the catheter body 1 is projected ahead of the balloon 7. There is. Therefore, when the catheter main body 1 is inserted into a blood vessel of a human body or when the catheter main body 1 is put on the blood flow and advanced through the blood vessel, the tip 1a of the catheter main body 1 hits the blood vessel wall, thereby causing "vasospasm" in the blood vessel. Had a problem of causing.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to provide a catheter that can be used without causing spasm of blood vessels.

[0006]

In order to achieve the above object, the catheter of the present invention comprises a catheter body having an open tip, and the pressure of blood flowing into the tip portion of the catheter body from the opening of the tip is adjusted. A pressure sensor for receiving and measuring the pressure is provided, and a balloon is provided at the tip of the catheter body so as to bulge forward from the tip.

[0007]

According to the above means, the pressure can be measured by receiving pressure from the opening at the tip of the catheter body without forming a pressure receiving hole in the peripheral side portion of the tip of the catheter body. It can be provided so as to bulge forward from the distal end without avoiding holes on the circumferential side of the distal end of the catheter main body, so that the distal end of the catheter main body does not protrude beyond the balloon. Can be

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 2 shows a catheter body 11, which is made of a thin tube having a diameter of several [mm], and has an opening 12 at its tip 11a as shown in FIG.

The inside of the catheter body 11 is divided into a plurality of (four in this case) lumens 13, 14, 15, 16 as shown in FIG. 3 excluding the tip portion, and inside the tip portion, As shown in FIG. 1, the pressure sensor 17 is attached to the inner wall while being sealed with silicone rubber 19 via a mounting base 18. In this case, the pressure-sensitive portion of the pressure sensor 17 is made thinner in the silicone rubber 19 so as to achieve both electrical insulation and electrical characteristics.

A signal line 20 of the pressure sensor 17 and a back pressure tube 21 are passed from the pressure sensor 17 to the lumen 13, and a resin seal is provided between each of the lumens 13 to 16 and the tip of the catheter body 11. A partition wall 22 is provided. As shown in FIG. 2, a connector 23 configured to connect the signal line 20 of the pressure sensor 17 and open the back pressure tube 21 to the atmosphere and a lumen are provided at the proximal end of the catheter body 11. 14
1 to 16 are connected to the air feeding valve 24 for feeding air.

When the balloon 25 is inflated by fully attaching the balloon 25 to the tip of the catheter body 11, the balloon 25 is attached to the tip of the catheter body 11.
Are provided so as to bulge further from the tip of the catheter body 11.

[0012] Therefore, in the case of the above-mentioned construction, when used, the catheter body 11 is inserted from the distal end portion into the blood vessel (vein) of the human body together with the balloon 25 in an atrophied state, and the air supply valve 24 is used to set one of the lumens 14 to 16. By injecting air through the balloon 25, the balloon 25 is inflated by the air, and is placed on the blood flow passing through the blood vessel to reach the heart or lungs. Then, in this state, the pressure sensor 17 receives the pressure of the blood flowing in from the distal end opening 12 of the catheter body 11, and the pressure (intracardiac pressure, pulmonary artery pressure, etc.) is signal line 29.
To measure through.

As described above, in this structure, a pressure receiving hole is not formed in the peripheral side of the distal end of the catheter body 11 unlike the conventional one, and pressure is received from the opening 12 of the distal end 11a of the catheter body 11. Because it measures the pressure,
The balloon 25 may be attached to the tip 11a without avoiding holes on the circumferential side of the tip of the catheter body 11 and provided so as to bulge forward from the tip 11a. It is possible to prevent the tip 11a of the main body 11 from protruding beyond the balloon 25. Therefore, when the catheter main body 11 is inserted into a blood vessel of a human body or when the catheter main body 11 is placed in the blood flow and advanced in the blood vessel, it is possible to avoid the tip 11a of the catheter main body 11 from hitting the blood vessel wall, causing spasm in the blood vessel. It can be used without causing it.

In contrast to the above, FIG. 5 shows a second embodiment of the present invention, in which the lumens 13 to 1 of the catheter body 11 are shown.
6 is extended to the tip 11a, a pressure sensor 17 is arranged in one of the lumens 14, and a part of the opening 12 of the catheter body 11 is sealed by the silicone rubber 26 at the tip of the lumen 14 , The lumen 13 to the lumen 14 is opened by the hole 27, and the pressure of the blood flowing in through the opening 12 of the catheter body 11 at the tip of the lumen 13 through the lumen 13 and the hole 27 in order is received by the pressure sensor 17, and the pressure ( It shows a device for measuring the intracardiac pressure, the pulmonary artery pressure, etc., and even in this case, the same operational effects as described above can be obtained. In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be appropriately modified and implemented without departing from the scope of the invention.

[0015]

As is clear from the above description, the catheter of the present invention comprises a catheter body having an open tip,
A pressure sensor that receives the pressure of blood flowing from the opening at the tip and measures the pressure is provided in the tip of the catheter body, and a balloon is provided at the tip of the catheter body so as to bulge from the tip to the tip. This prevents the tip of the catheter body from hitting the blood vessel wall when the catheter body is inserted into a blood vessel of the human body or when the catheter body is placed in the bloodstream and advanced through the blood vessel. It has an excellent effect that it can be used without causing spasm in blood vessels.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main portion showing a first embodiment of the present invention.

[Fig. 2] Side view of the whole with a part cut away

FIG. 3 is a sectional view of the catheter body taken along the line AA in FIG.

FIG. 4 is a sectional view of the catheter body taken along the line BB in FIG.

FIG. 5 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

11 is a catheter body, 11a is the tip of the catheter body, 12 is an opening, 17 is a pressure sensor, and 25 is a balloon.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (1) Noda No. 1 Toyoda, Oguchi-cho, Niwa-gun, Aichi Prefecture, Shinichi Hirano, Tokai Rika Electric Co., Ltd. (72) Inventor, Yasuhiro Goto Oguchi-machi, Niwa-gun, Aichi Prefecture No. 1 Tokai Rika Denki Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. A catheter main body having an open tip, a pressure sensor provided to measure the pressure of blood flowing into the distal end portion of the catheter main body from the opening of the tip, and the catheter main body of the catheter main body. A catheter comprising a balloon provided at a distal end portion so as to bulge forward from the distal end.