Balloon catheter used for intracranial CTO

Abstract

The invention provides a balloon catheter used for intracranial CTO. The balloon catheter comprises a hyposulfite pipe segment, a multi-cavity pipe transition segment and a balloon segment, wherein the balloon segment comprises a balloon and a balloon pipe body; the balloon is in sleeving out of the balloon pipe body; the hyposulfite pipe segment, the multi-cavity pipe transition segment and the balloon pipe body are connected in sequence, and the hardness of the hyposulfite pipe segment, the hardness of the multi-cavity pipe transition segment and the hardness of the balloon pipe body are gradually reduced; the balloon pipe body comprises an inner layer, a weaving layer and an outer layer, wherein the inner layer, the weaving layer and the outer layer are in coating connection in sequence along the radial direction of the balloon pipe body; and the weaving layer is woven by metal wires. By use of the above scheme, the hardness of each segment of the balloon catheter is under a gradual change tendency, and the hardness of the whole balloon catheter is gradually reduced from a near end to a far end so as to adapt to bent and blocked blood vessels with a small internal diameter on an intracranial CTO lesion position; and by use of the weaving layer woven by the metal wires in the balloon pipe body, while the flexibility of the balloon segment is guaranteed, axial propelling force is increased, the penetrability of the balloon catheter is improved, and the balloon catheter can more easily penetrate through an intracranial CTO lesion area.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a balloon catheter for intracranial CTO. Background technique [0002] About 10% of ischemic strokes are caused by severe stenosis or occlusion of intracranial atherosclerosis, which can be collectively referred to as intracranial large artery occlusive disease (LAOD). The risk ranged from 3.6% to 22.0%, with a higher annual stroke risk in patients with hemodynamic impairment. The annual risk of stroke is 6% for those with 50% to 69% stenosis of intracranial arteries, as high as 19% for those with 70% to 99% stenosis, and 23.4% for patients with symptomatic chronic intracranial arterial occlusion . [0003] Chronic intracranial large artery occlusion (CTO) not only causes more severe neurological deficits leading to severe disability and even death, but also has a higher recurrence rate of stroke / TIA. conclusions are uncertain. The characteristics of intracranial CTO lesions ar...

AI Technical Summary

Problems solved by technology

[0005] The existing patented intracranial balloon dilatation catheter has made some improvements for intracranial stenosis, but it is not specially used for the characteristics of intracranial CTO lesions. For intracranial CTO lesions, it still has the following problems: 1. The existing The working length of the intracranial balloon is short, the longest is about 30mm. For cases with long intracranial CTO lesions, multiple expansions are required, which increases the operation time and intraoperative risk; 2. The existing intracranial balloon Most of the balloons are non-compliant or semi-compliant balloons. After inflation, the entire balloon is relatively hard, which may damage intracranial blood vessels, and is not suitable for curved intracranial blood vessels; 3. The blockage rate of intracranial CTO lesions reaches 99%, when the catheter is soft, it is difficult to pass through the blocked lesion, and when the catheter is hard, it is difficult to pass through the curved and narrow intracranial blood vessels; When passing through the curved intracranial blood vessels, bending may occur, and the way to avoid bending is to increase the wall thickness, but increasing the wall thickness will increase the difficulty of passing the lesion; at the same time, the loading part of the existing balloon It is basically a double-chamber or inner and outer two-layer structure, one layer is pressurized, and the other layer is connected to the guide wire, which results in a larger outer diameter of the tube and is not easy to pass through curved blood vessels; therefore, for intracranial CTO lesions, the existing balloon catheter is more flexible. It does not match the penetrability very well; 4. The blockage rate of intracranial CTO lesions reaches 99%, and the existing catheter tip is basically a round mouth, and the resistance is relatively large when passing through the lesion; 5. For longer balloons , the existing catheter lumen takes a long time to pressurize and release pressure, and the high pressure of the catheter makes the operation time longer and increases the risk of operation

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