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Endoscopic treatment instrument

  • US 8,167,893 B2
  • Filed: 09/20/2007
  • Issued: 05/01/2012
  • Est. Priority Date: 09/22/2006
  • Status: Active Grant
First Claim
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1. An endoscopic treatment instrument comprising:

  • a cylinder adapted to be fitted over a tip of an insertion section of an endoscope;

    a loop-shaped snare wire which protrudes in the cylinder from a snare sheath that is extendable and retractable with respect to the insertion section and which is extendable within the cylinder;

    a hooked portion which is radially inwardly extended from the circumference of a tip of the cylinder and which holds the snare wire within the cylinder;

    a locking portion provided on the hooked portion in front of a distal end of the snare wire and the snare sheath so as to face the distal end of the snare wire and the snare sheath; and

    an auxiliary hooked portion bent at an end part of the hooked portion and extending toward the proximal end of a cap portion, whereinwhen the snare wire advances to the locking portion, the locking portion contacts a folded-back portion of the snare wire and the locking portion and the auxiliary hooked portion holds the folded-back portion.

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