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Diathermic snare, medical instrument system using the snare, and method of assembling the medical instrument system

  • US 20040158124A1
  • Filed: 01/26/2004
  • Published: 08/12/2004
  • Est. Priority Date: 01/31/2003
  • Status: Active Grant
First Claim
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1. A diathermic snare used in combination with an endoscope, the endoscope including an inserting section which is inserted into a body cavity and which has a distal end and a proximal end, and a cylindrical cap section mounted on the distal end of the inserting section, the cap section having a distal end, a proximal end and an engagement projection having a bending portion that bends inward at the distal end of the cap section, wherein the diathermic snare comprises:

  • an elongated flexible sheath having a distal end and a proximal end;

    an operating wire inserted into the sheath so as to move forward and backward and having a distal end and a proximal end;

    a snare wire coupled to the distal end of the operating wire and having a loop section which expands like a loop;

    an operating section coupled to the proximal end of the sheath and including a guide member extending in an axial direction of the sheath and a slider which moves forward and backward in the axial direction of the sheath along the guide member and which is coupled to the proximal end of the operating wire;

    the loop section of the snare wire projecting from the distal end of the sheath, the snare wire expanding like a loop, and the loop section expanding along an inner circumference of the engagement projection when the slider moves toward along the guide member; and

    the loop section being stored in the sheath when the slider moves backward along the guide member; and

    a bending portion provided at the distal end of the loop section, the bending portion ending in a direction that intersects a plane formed by the loop section and conforming to a corner of the bending portion of the engagement projection when the loop section expands along the inner circumference of the projection.

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