Thrombus aspiration catheter

Abstract

The invention provides a thrombus aspiration catheter, and belongs to the field of medical instruments. The thrombus aspiration catheter comprises a catheter hub and a catheter body, wherein a winderis arranged in the catheter hub, the catheter body sequentially consists of an inner-layer polymer tube, a middle-layer support tube and an outer-layer polymer tube from inside to outside, 0-4 core wires are uniformly distributed in the catheter body in the circumferential direction, one end of each core wire is fixedly connected to the winder, the other end of the core wire is fixed to the far end of the catheter body, a bulging section capable of expanding and contracting in the circumferential direction is arranged at the far end of the outer-layer polymer tube and is composed of a bulgingsection near end, a bulging section middle section and a bulging section far end which are connected in sequence from the near end to the far end, and elastic spiral winding wires are arranged in thebulging section near end and the bulging section far end. According to the thrombus aspiration catheter, the advancing angle of the catheter can be freely and flexibly adjusted by arranging the core wires, backflushing is reduced by arranging the bulging section, the catheter body can still move during near-end plugging, the difficulty in operation is reduced, and the suction effect is improved.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a thrombus suction catheter. Background technique [0002] With the improvement of people's living standards, the incidence of thrombotic diseases is increasing, which can block or completely interrupt blood flow. If this type of embolism occurs in the cardiovascular and cerebrovascular, it will cause very serious consequences, ranging from disability to severe death. How to quickly and effectively eliminate these blockages is an urgent problem to be solved by those skilled in the art. [0003] In the prior art, a suction catheter is usually used to remove foreign bodies such as thrombus in blood vessels. The suction catheter is delivered to the thrombus site, and by applying negative pressure at the proximal end of the suction catheter, foreign matter such as thrombus is discharged along the catheter lumen, and blood circulation is re-established. [0004] However, the current s...

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Problems solved by technology

[0004] However, the current suction catheter cannot effectively reach the expected lesion location, the operation is cumbersome, the risk factor is high, and the suction efficiency is not good, which is mainly reflected in the following aspects:

[0005] (1) In order to increase the visualization of the distal end, most of the existing suction catheters use a rigid development ring. This development ring is usually fixed on the distal end by forging. After forging, the development ring is mostly angular. Polygonal, this will cause two disadvantages, one is to scratch the vessel wall or the inner wall of the matching catheter during the advancement process, and second, the aspirated thrombus will be stuck at the tip of the catheter, resulting in failure of the operation

[0006] (2) Most of the existing suction catheters do not have a proximal blockage balloon, causing most of the blood to be sucked from the proximal end, which cannot guarantee the suction effect on the distal end, resulting in an increase in the amount of blood drawn out, which increases the patient's life expectancy. Physical burden, allogeneic blood needs to be supplemented during the operation, the efficiency is low, the operation time is increased, and the risk of the operation will also be increased; moreover, during the thrombus aspiration process, the thrombus will inevitably rupture or fall off. Treatment of small ruptured thrombi can easily cause them to flow with the blood to the narrower distal blood vessels, causing unpredictable risks to patients

The cooperation between the catheters in the above process requires at least three hemostatic valves, which reduces the actual effective length of the catheter, and the operation is cumbersome and complicated, requiring constant adjustment of the hemostatic valves

[0008] (4) The suction catheter moves against the wall in the blood vessel, so the suction port of the suction catheter is also deviated from the center of the blood vessel, which leads to the eccentric suction of the thrombus, resulting in incomplete suction of the thrombus

[0009] (5) When a thrombus is sucked in a tortuous blood vessel, the sucked blood flow has a backlash effect on the catheter itself. If there is no effective support or fixation, it is easy to cause the catheter to swing back and forth during suction, causing damage to the blood vessel. Damage, even deflection is too large to withdraw from the target suction area, prolonging the operation time

[0011] Patent No. CN1893997A discloses a quick-exchange suction catheter, which increases the cross-sectional area of ​​the proximal lumen by adding a rapid-exchange guide wire lumen at the distal end and removing the proximal guide wire lumen in the traditional design. The inner diameter of the distal end of the suction catheter is not increased, but the overall hardness of the distal end of the catheter becomes higher and the flexibility is uneven due to the addition of a rapid exchange guide wire lumen, resulting in poor passability of complex anatomical structures and reduced suction performance

[0012] Patent No. CN101389371A discloses a double-lumen suction catheter. Its structure is similar to patent CN1893997A. The improvement is that a beveled edge is added to the tip of the catheter, which is intended to prevent the suction catheter from scratching when advancing along the guide wire. blood vessels, but this design also makes the edge of the catheter tip slope lose the support of the blood vessel wall, so that it is closer to the blood vessel wall, and the eccentricity is more serious. Its effective suction area is compressed into a narrow triangular area, which affects the suction performance.

[0013] Patent Nos. CN108904006A, CN104984461A, and US7422579 disclose a multi-lumen suction catheter, which is provided with a balloon that can block the blood flow to ensure that the proximal end of the thrombus is blocked, so that the suction of the suction chamber can be concentrated on the thrombus, but this structure Once the balloon is dilated, the catheter will not be able to move, so that the catheter cannot move during suction, reducing the suction effect, so that the thrombus at the distal end of the long blockage cannot be completely sucked; and the multi-lumen structure is not set to play a supporting role The metal braid layer, when the balloon expansion chamber is in a positive pressure state during suction, it will squeeze the suction chamber. At this time, the suction chamber is in a negative pressure state, which will increase the effect of extrusion, making the suction chamber at risk of being crushed

[0014] Patent No. CN102319097A discloses a suction catheter, which is equipped with a sleeve on the outside. The structure of the sleeve is similar to the coaxial integral exchange balloon catheter, which is equivalent to adding a double-lumen tube to the outside of the original suction catheter. The performance and passing performance cannot be compared with the single suction catheter, so it cannot reach the distal end of the blood vessel with complex anatomical structure with the suction catheter, and the practical performance is reduced; moreover, this structure pushes the suction forward in the blood vessel with complex anatomical structure When the suction catheter encounters resistance, it will bend and deform backwards. Due to the interaction between the suction catheter and the cannula, although the cannula is fixed by a balloon, the balloon is easier to approach due to the larger size of the proximal vessel. Sliding end, plus the previous interaction may cause the cannula to retreat, the sealing effect will disappear, and the operation time will be prolonged

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