RETRIEVAL SNARE FOR EXTRACTING FOREIGN OBJECTS FROM BODY CAVITIES AND METHOD FOR MANUFACTURING THEREOF

摘要

A retrieval snare for entrapping and retaining a foreign object located in a body and a method for manufacturing of the snare are provided. The snare comprises a structure having a proximal portion and a distal portion and includes a plurality of filaments. The filaments extend from an end of the proximal portion towards the distal portion and return to the end of the proximal portion to form a plurality of loops. The loops are not interconnected at the distal portion, but each side of each loop are connected to a side of an adjacent loop in the proximal portion at more than one point, thereby providing structural rigidity and dilatation ability to the snare.

主权项

1. A method for manufacturing a retrieval snare for entrapping and retaining a foreign object located in a body for its extraction therefrom, the method comprising:
selecting a predetermined number of filaments; providing a weaving jig having a working surface, the working surface having a predetermined convex shape defining an opening angle of the snare and a predetermined pattern formed by radial channels configured on the surface, the working surface having a central portion and a peripheral portion, at least a part of the radial channels being formed in the form of a plurality of notches extending from a center of the surface towards the peripheral portion, the plurality of notches being not interconnected at the peripheral portion, and each radial channel includes at least one notch that shares a common part with at least one notch of an adjacent radial channel in the central portion of the working surface; placing the filaments into the radial channels to form a plurality of filament loops with free parts of the filaments arranged in the center of the working surface; fastening the filament loops to the jig at the peripheral portion of the working surface; connecting each side of each filament loop disposed in the common part of the radial channels to a side of an adjacent filament loop at more than one point; fastening the free parts of the filaments arranged in the center of the working surface together; shape storing annealing the retrieval snare, thereby imparting structural rigidity and dilatation ability to the snare; cooling the retrieval snare; unfastening the parts of the filaments tied at least at the peripheral portion of the working surface; removing the jig; and binding the free parts of the filaments together.