Retractable drug coating stent

Abstract

The invention provides a retractable drug coating stent, and belongs to the technical field of medical apparatus and instruments. The stent comprises an inner tube, a middle tube, an outer tube and a self-expanding stent, and the near ends of the inner tube, the middle tube and the outer tube are connected with a pushing device; the far end of the inner tube is provided with a tip; the surface of the self-expanding stent is provided with spines, the surface of the self-expanding stent is provided with a drug coating, and the self-expanding stent is connected to the far end of the middle tube; and the self-expanding stent has a folded state and an expanded state. According to the retractable drug coating stent, the surface of the self-expanding stent is provided with the spines, the spines can penetrate through calcified lesions and tunica intima and enter tunica media vasorum and tunica adventitia vasorum for deep administration, and the drug utilization rate is increased; and the drug coating stent cannot be retained in the body of a patient, meanwhile, blood flow cannot be blocked in the mode, the drug delivery time can further be controlled, the whole operation process is simple and convenient, and the stent is easy to operate.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a retractable drug-coated stent. Background technique [0002] At present, endovascular interventional therapy has become the first choice for the treatment of lower extremity arteriosclerosis obliterans. In recent years, more and more drug-bearing devices have been reported for the treatment of lower extremity arteriosclerosis obliterans, such as drug-eluting stents, drug-coated stents, Drug-coated balloons, etc. Compared with traditional balloon angioplasty and bare metal stents, drug-eluting stents and drug-coated balloons can effectively improve the patency rate of target lesions. [0003] Among them, the drug-eluting stent will remain in the body permanently during use, but the physiological load of the lower extremity arteries is complex, the stent fracture rate is high, and the re-interventional surgery is difficult and the choice is small. Although the drug-coat...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the easy breakage of the drug-eluting stent in the prior art when the drug-eluting stent remains in the body, the drug-coated balloon has a large dosage, and the drug utilization rate is low. Blood flow needs to be blocked when taking medicine, which limits the wall-attachment time and drug absorption rate of the drug-coated balloon. At the same time, the defect of slow drug delivery efficiency provides a retractable drug-coated stent

Images