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Surgical instrument

  • US 7,666,206 B2
  • Filed: 07/30/2003
  • Issued: 02/23/2010
  • Est. Priority Date: 07/30/2002
  • Status: Expired due to Fees
First Claim
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1. A surgical instrument comprising:

  • an insertion section having a distal end portion and a proximal end portion, the insertion section comprising first and second driving rods which are disposed side by side and each of which has a distal end portion and a proximal end portion;

    a pair of jaws disposed in the distal end portion of the insertion section;

    a support which pivotally supports at least one jaw of the pair of jaws to be relatively opened/closed;

    a sliding member which supports the at least one jaw of the pair of jaws being pivotally supported by the support, and which is slid in an axial direction of the support with respect to the support to relatively open/close the at least one jaw of the pair of jaws being pivotally supported by the support;

    a connecting rod having a distal end portion and a proximal end portion, the sliding member being pivotally supported on the distal end portion of the connecting rod to open/close the pair of jaws, and the distal end portion of the first driving rod being pivotally supported on the proximal end portion of the connecting rod;

    a rotation mechanism which rotatably supports the support on the distal end portion of the insertion section, and pivotally supports the support on the distal end portion of the second driving rod in a state of being offset with respect to a center axis of the support; and

    an operation section disposed in the proximal end portion of the insertion section, which pivotally supports the proximal end portions of the first and second driving rods when the operation section is opened/closed and rotated, an opening/closing force by the opening/closing operation being transmitted from the proximal end portion to the distal end portion of the first driving rod to slide the sliding member on the support through the connecting rod thereby opening/closing the pair of jaws, and a rotating force by the rotation operation being transmitted from the proximal end portion to the distal end portion of the second driving rod to apply a rotational force on the support to rotate the support on the distal end portion of the insertion section, thereby rotating the pair of jaws relatively with respect to the insertion section,wherein the connecting rod has rigidity which opens/closes the pair of jaws for a biomedical tissue in a state where a rotational position of the pair of jaws with respect to the insertion section has been held to enable treatment of the biomedical tissue, and wherein the connecting rod is made of a metal material, andwherein the first driving rod is arranged in a position of being offset with respect to a center axis of the insertion section,the sliding member is arranged on a center axis of the support, andwhen the insertion section and the support are arranged on the same axis, an axial direction of the connecting rod is inclined in an axial direction of the insertion section and the support, and,wherein the sliding member has a circular-arc surface, anda distal end portion of the connecting rod has an abutment surface abutted on the circular-arc surface of the sliding member.

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