Retractable drug perfusion stent system

Abstract

The invention provides a retractable drug perfusion stent system, and belongs to the technical field of medical apparatus and instruments. The system comprises an inner tube, an outer tube, a perfusion micro-tube, a perfusion tube and a drug delivery device, wherein the outer tube slidably sleeves the inner tube, and the near ends of the inner tube and the outer tube are connected with a pushing device; and the far end of the inner tube is provided with a tip; the perfusion micro-tube is spiral, and micro-holes are formed in the perfusion micro-tube. According to the retractable drug perfusion stent system, the micro-holes are formed in the perfusion micro-tube, after the perfusion micro-tube reaches a lesion position, the perfusion micro-tube is switched from a folded state to an expanded state, at the moment, the perfusion micro-tube is separated from the limitation of the outer tube and automatically expands to be attached to the blood vessel wall and expand a target lesion, the drug delivery device feeds a drug into the perfusion micro-tube through the perfusion tube, and the drug is delivered to the target lesion through the micro-holes of the perfusion micro-tube. The drug perfusion stent cannot be retained in the body of a patient, meanwhile, the blood flow cannot be blocked in the mode, drug delivery can be continuously carried out, the drug delivery time is controlled, the whole operation process is simple and convenient, and the retractable drug perfusion stent system is easy to operate.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a retractable drug perfusion stent system. Background technique [0002] At present, endovascular interventional therapy has become the first choice for the treatment of lower extremity arteriosclerosis obliterans. This year, more and more medicine-carrying 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 ...

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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. The blood flow needs to be blocked when the drug is administered, which limits the wall-attachment time of the drug-coated balloon and the defects of the drug absorption rate, thereby providing a retractable drug-perfused stent system

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