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Basket-type grasping forceps

  • US 9,775,634 B2
  • Filed: 03/15/2016
  • Issued: 10/03/2017
  • Est. Priority Date: 12/12/2013
  • Status: Active Grant
First Claim
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1. A basket-type grasping forceps for use in a body cavity, the basket-type grasping forceps comprising:

  • a sheath having flexibility and formed in a tube shape;

    a plurality of basket wires having a restoring force that restores helically;

    a basket part configured to protrude and retract from a distal portion of the sheath and in which the plurality of basket wires extend helically with a gap therebetween, the basket part including;

    a proximal region in which the plurality of basket wires are sparsely arranged;

    a distal region in which the plurality of basket wires are arranged more closely than in the proximal region; and

    an internal space surrounded by the proximal region and the distal region;

    an operating wire connected to a proximal end of the basket part and is inserted into the sheath;

    a support member passing through the gap in the basket part and extending substantially parallel to the operating wire;

    a coupling member fixing a distal end of the basket part to a distal end of the support member;

    an operating section fixed to a proximal end of the sheath, the operating section having a slider connected to a proximal end of the operating wire, and the operating section including a proximal region of the support member that protrudes from an interior of the operating section to an exterior of the operating section; and

    a discharge mechanism discharging an object housed in the internal space of the basket part outside the basket part via the operating section while the basket part is configured to be disposed in the body cavity, the discharge mechanism including;

    a first configuration in which the operating wire is relatively retracted along a longitudinal axis of the sheath with respect to the support member by relatively retracting the slider with respect to the support member, the first configuration being a state where;

    the proximal end of the basket part is positioned distally more than a distal end of the sheath, and the basket part is stretched out in an axial direction of the basket part against restoring forces of the plurality of the basket wires, anda second configuration in which the operating wire is relatively advanced along the longitudinal axis of the sheath with respect to the support member by relatively advancing the slider with respect to the support member, the second configuration being a state where;

    the proximal end of the basket part is positioned distally more than the distal end of the sheath, and the basket part is deformed in the axial direction of the basket part such that the gap in the proximal region of the basket part has a substantial round shape against the restoring forces of the plurality of the basket wires.

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