Suction catheter with adjustable suction cavity opening caliber

Abstract

The invention provides a suction catheter with an adjustable suction cavity opening caliber. The catheter comprises a catheter main body, a suction head and a control assembly, the suction head is connected to the far end of the catheter main body, and a suction cavity opening is formed at the far end of the suction head; and the suction head comprises a support and a wrapping net, the support iselastic and is in a horn mouth shape that the far-end caliber is larger than the near-end caliber in the natural state, the wrapping net is tightened to become compact or loosened to become loose, andthe control assembly is connected to one or more wires forming the wrapping net. When the wires are drawn, the wrapping net become compact, and the support is compressed, so that the suction cavity opening shrinks; and when the wires are released, the wrapping net becomes loose due to resilience force of the support, so that the suction cavity opening is expanded, and the outer circumferential face and/or the inner circumferential face of the suction head are/is completely covered with an elastic hydrophobic film. The wrapping net is controlled to increase the caliber of the suction cavity opening so as to realize the suction on large thrombus. In the retracting process, the caliber of the suction cavity opening is reduced, so that blood vessel damage caused by friction between the suction catheter and the blood vessel wall is relieved.

Description

technical field [0001] The invention relates to a medical device for interventional treatment, and in particular to a suction catheter device for taking out thrombus in a blood vessel. Background technique [0002] Acute ischemic stroke (acute cerebral infarction, generally within 2 weeks of onset) is the most common type of stroke, which is caused by cerebral thrombosis or cerebral hypoxia caused by thrombosis blocking cerebral blood vessels. Cerebral thrombosis has the characteristics of high morbidity, disability, mortality and recurrence. The main treatment methods are drug thrombolysis and mechanical thrombectomy. However, judging from the current clinical effects, the effect of simple drug thrombolysis or mechanical thrombectomy is not very satisfactory. [0003] Mechanical thrombectomy mainly includes thrombus suction, thrombectomy with grab, and laser thrombectomy. The main problem is that when the emboli are large, simple aspiration of the thrombus may not be abl...

AI Technical Summary

Problems solved by technology

[0006] First, the frictional force of the distal end of the suction catheter during transportation is increased, resulting in that the suction catheter may not be able to travel far in some tortuous and complex lesion structures;

[0007] Second, the soft balloon is in a contracted state during the withdrawal of the thrombus and the suction catheter. At this time, the blood flow may impact the thrombus and cause the thrombus to escape;

[0008] Third, the process of compounding soft balloons outside the catheter is more complicated, resulting in higher production costs

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