Double-balloon drug coating balloon dilatation catheter

Abstract

The invention discloses a double-balloon drug coating balloon dilatation catheter. The double-balloon drug coating balloon dilatation catheter comprises a push rod, and the far end of the push rod is fixedly provided with a working balloon for attaching drug coating and a blocking balloon for block blood flow; the inside of the push rod is provided with a guide wire cavity for mounting a guide wire in a through mode, a first filling cavity for filling the working balloon, and a second filling cavity for filling the blocking balloon, wherein he first filling cavity is communicated with the inner cavity of the working balloon, and the second filling cavity is communicated with the inner cavity of the blocking balloon. By means of the double balloons, the double-balloon drug coating balloon dilatation catheter can reduce flushing effects of blood flow on drug to reduce drug loss, and meanwhile, can have no increase in the diameter to reduce surgical difficulty and surgical injuries.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and relates to a dilation catheter, in particular to a double-balloon drug-coated balloon dilation catheter. Background technique [0002] Arterial stenosis has always been a kind of disease that plagues human beings. In order to cure this kind of disease, human beings have successively experienced treatment stages such as bare balloon, bare stent, and drug stent, and the defects of various treatment options have also been exposed in subsequent practice. . So the drug-eluting balloon catheter came into being. It avoids the risk of in-stent restenosis after the stent is implanted. Hyperplasia prevents restenosis of blood vessels. [0003] In the prior art, drug loading on the outer wall of single-balloon catheters is common, such as figure 1 Shown is a single-balloon catheter that delivers drugs to the lesion for dilation, but this drug-eluting balloon catheter loses more than 50% of th...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, drug loading on the outer wall of single-balloon catheters is common, such as figure 1 Shown is a single-balloon catheter that delivers drugs to the lesion for dilation, but this drug-eluting balloon catheter loses more than 50% of the drug during intravascular delivery by rapid arterial blood flow About 30% of the drug is washed away by the fast-flowing blood flow at the moment when the balloon is opened, and when the diameter of the blood vessel and the balloon expansion diameter are less than 1:1

These lost drugs not only have the risk of blocking distal blood vessels, but also these washed-out drugs will increase the metabolic burden of the body

[0004] The improvement of the existing technology is mainly on the single-balloon drug balloon catheter. The improvement has a certain effect, but there are still many problems. Drug loss during intravascular crossing, such an incomplete drug loading method on the balloon surface not only has the risk that the diseased site cannot receive effective therapeutic drugs, but also cannot avoid the fact that the diameter of the balloon and the blood vessel wall cannot reach 1 at the moment of expansion. : 1 time the blood washes out the drug

[0005] Another improvement is to use multiple balloons. At least two distal balloons and proximal balloons are respectively arranged on both sides of the drug-loaded working balloon. After the distal balloon and the proximal balloon are inflated, the blood vessel is blocked. A chamber is formed between two balloons, and the balloon catheter with multiple balloons has the following disadvantages: when the distal balloon and the proximal balloon are inflated to block the blood vessel, a chamber is formed between the two balloons, and There is closed blood in the chamber, and when the working balloon is refilled, the closed blood has nowhere to flow, which will affect the expansion effect or cause difficulty in expanding the balloon and may cause damage to blood vessels. The steps are cumbersome, which affects the smooth blood flow; multiple filling cavities are required, which increases the diameter of the catheter, and then requires the use of a large-diameter guide catheter, which makes it inconvenient for the doctor to operate, and also increases the puncture hole at the patient's puncture site, increasing the patient's In addition, the balloon catheter with multiple balloons has a large contact area between the balloon and the blood vessel, and the risk of the balloon scratching calcified lesions and stenotic lesions increases

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