JPH01153165A - Catheter - Google Patents

Abstract

PURPOSE:To prevent a patient from falling into an ischemic status by use of a constitution whereby a blood bypass is provided which starts from a blood introducing opening situated on the opposite side of the tip of the catheter outside of the perforating portion to avoid pressurized swollen portion. CONSTITUTION:A catheter 1 penetrates through a pressurized swollen portion 2, which is located at a certain distance from the top. The pressed swollen portion 2 made of thin silicon gum, etc. is formed around the whole circumference of the lateral wall near the top of the catheter. There is a portion of a guide wire introducing way where it is narrowed from the blood introducing opening 6 separated from the pressurized swollen portion 2 by some distance, and its wall plays a role as a wall of a blood bypass 5. Therefore, when the catheter 1 is inserted into a blood vessel, it reaches the narrowed and thrombosed sites to inflate a balloon 2. Since blood flows into the blood introducing mouth 6 even if it is in close contact with the stenosed site, the pressure on the blood introducing mouth side becomes higher than that at the downstream mouth of the blood bypass, permitting patient blood always flow to the downstream side of the blood vessel. In this way patients can be protected from hazard of falling into ischemic state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a catheter inserted into a living body and used for dilating a stenotic site.

(Prior art and its problems) Conventionally, PTA (PERCUTANEOUS) has been an important treatment method for ischemic heart disease.
TRANSLUMINAL ANGIOGRAPHY
) namely percutaneous angioplasty. In particular, PTA for coronary arteries is called PTCA. This method has been highly praised as a means of reestablishing blood circulation in the coronary arteries without opening the chest, and is replacing bypass surgery.

The PTA procedure involves using a catheter 1 as shown in Figure 3.
For example, the femoral artery is punctured and inserted into the femoral artery, the compressed bulge 2 is brought to the stenotic site, and liquid is fed through the insertion port to inflate the bulge 2 and widen the stenotic site.

By the way, as shown in FIG. 4, the pressurized bulge 2
While the blood vessel is inflated, blood flow is blocked, so blood does not reach the nourished areas downstream of the blood vessel, resulting in an ischemic state. Therefore, in the case of patients suffering from severe cardiomyopathy, even such a temporary ischemic state can cause severe damage to the myocardium and lead to death, which is a factor that significantly limits the application of PTA.

[Configuration of the Invention (Means for Solving Problems) In FIG.
It is equipped with a tube that avoids blood flow to avoid blood blockage. That is, the blood bypass pipe 5 has a distance from the blood guide port 6 located on the opposite side of the distal end of the catheter 1 on the outside of the penetration part to the vicinity of the distal end of the catheter while avoiding the pressurized bulging part 2. Therefore, even if the flow of blood is apparently blocked while the pressurized bulge 2 is being inflated at the stenosis site, the blood will flow downstream of the blood vessel through the blood bypass pipe 5. Don't go into ischemia to go.

(Function) The function of the present invention having the above configuration is that when liquid is fed into the catheter 1 from the liquid inlet 9 and the pressurized bulge 2 is inflated, the blood is not obstructed and the blood flows through the blood bypass tube. 5 and passes through the stenosis site, so it does not become an ischemic state.

(Example) Hereinafter, a catheter according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a catheter 1 according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the catheter 1 inserted into a blood vessel.

In FIG. 1, a catheter 1 passes through a pressurized bulge 2. In FIG. The pressurizing bulge 2 is located a predetermined distance away from the tip.

The pressurizing bulge 2 near the tip of the catheter is made of highly elastic material such as thin silicone rubber, and is formed over the entire circumference of the measuring path. Such a pressurizing bulge 2 is so called because it bulges outward due to pressure applied from the inside.

There is a part where the guide wire guide path 4 narrows from the blood guide port 6 located a predetermined distance away from the pressurized bulge 2, and the wall of this guide wire guide path 4 is narrower than the blood guide port 6. It also serves as the wall of the bypass pipe 5.

FIG. 2 shows the catheter 1 being punctured and inserted into a blood vessel. Guided by a guide wire 3, the catheter 1 reaches the stenosis or thrombus due to arteriosclerosis, and the balloon member 2 is inflated at the stenosis site.

Even if the pressurizing bulge 2 swells and the pressurizing bulge 2 comes into close contact with the stenosis site, blood flows into the blood guide port 6, so the pressure on the blood-only eye side will inevitably increase. The pressure becomes higher than the pressure at the downstream port of the bypass tube, and the blood on the upstream side of the blood vessel flows downstream.

Therefore, even while the pressurizing bulge 2 is inflated to dilate the narrowed portion of the blood vessel, the patient's own blood flow always flows downstream of the blood vessel.

[Effects of the Invention] As detailed above, according to the present invention, the patient's own blood always flows downstream of the blood vessel even while the pressurized bulge 2 is inflated, so that the patient's own blood constantly flows downstream of the blood vessel. The danger is gone P
The indications for TA are significantly expanded. Furthermore, since there is no risk of ischemia, the patient can concentrate on inflating the pressurized bulge 2, thereby improving the safety of the procedure.

[Brief explanation of the drawing]

Figure 1 shows a catheter according to an embodiment of the present invention; a) is a side cross-sectional view, (b) is a front view cut along the A-A'' plane, and Figure 2 shows the catheter being punctured and inserted into a blood vessel. FIG. 3 is a schematic side sectional view of a catheter without a conventional blood bypass tube, and FIG. 4 is a schematic side sectional view of the catheter shown in FIG. 3 inserted into a blood vessel.1. ... Catheter, 2 ... Pressure expansion part 3 ... Guide wire 4 ... Guide wire guide path 5 ... Blood bypass pipe, 6 ... Blood exclusive lower ...
Stenosis site in blood vessel, 8... Blood vessel 9... Liquid inlet

Claims (1)

[Claims] In a catheter that has a cylindrical guide wire guide path inside that passes through a pressurized bulge that expands when liquid is injected from the liquid inlet, the tube is placed on the side opposite to the tip of the catheter on the outside of the penetrating portion. A catheter characterized in that it is equipped with a blood bypass tube having a distance from a blood guide port located therein to a point close to the distal end of the catheter while avoiding a pressurized bulge.