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Retrieval snare for extracting foreign objects from body cavities and method for manufacturing thereof

  • US 10,201,846 B2
  • Filed: 01/25/2016
  • Issued: 02/12/2019
  • Est. Priority Date: 10/06/2006
  • Status: Active Grant
First Claim
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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.

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