3 results about "Stenotic lesion" patented technology

Some embodiments of a rotational atherectomy device can remove (partially or completely) stenotic lesions in blood vessels by rotating one or more abrasive elements in an orbital path to abrade and breakdown the lesion. In particular implementations, multiple abrasive elements are arranged along a distal portion of a drive shaft with an improved configuration so as to facilitate both efficient navigation into smaller blood vessels below the ankle or in the heart and effective orbital paths for abrading stenotic material in such smaller vessels.

This application relates to the field of medical device technology and discloses a visual navigation coronary angiography guidewire assembly and its usage method. The main body of the assembly has a maximum outer diameter of no more than 0.36 mm and includes a guidewire body and a visual navigation unit integrated within it. The guidewire body consists of a proximal high-rigidity section and a distal flexible transition section. The core wire accommodates signal transmission lines through surface axial grooves or an internal hollow tube structure. A miniature sensor is fixed to the guidewire tip and communicates with an external processing terminal through a detachable proximal connection interface for real-time reconstruction of the tip's three-dimensional coordinates and orientation. This invention solves the problem of traditional X-ray fluoroscopy lacking depth information, achieving the integration of mechanical guidance and multimodal navigation. It ensures that the guidewire retains the axial support required to pass through stenotic lesions while possessing intravascular navigation capabilities, avoiding the problems of guidewire thickening or decreased mechanical maneuverability caused by integrated sensors.

This invention discloses a dual-pathway reflux protection device via the femoral artery, comprising: a balloon catheter; the balloon catheter extending into a first target area via the femoral artery; one side of the balloon catheter connected to a first circuit and a second circuit via a Y-connector, and a reflux pump connected between the first circuit and the second circuit; the other ends of the first circuit and the second circuit connected to a venous sheath extending into the second target area; the reflux pump activates, switching the protection device from a first state to a second state; in the first state, blood enters the first chamber of the reflux pump from the balloon catheter and the first circuit, and blood in the second chamber of the reflux pump enters the second target area via the second circuit and the venous sheath; in the second state, blood enters the second chamber of the reflux pump from the second circuit, and blood in the first chamber enters the second target area via the first circuit and the venous sheath; ensuring sufficient pressure differential and effective reflux to prevent plaque from detaching from the stenotic lesion and causing embolism in intracranial blood vessels.