Endoscopic surgical instrument with grip enhancing means

A tool mechanism for an endoscopic surgical instrument for grasping tissue, said mechanism including a pair of tissue gripping members in opposing relation reciprocatingly movable toward and away from each other, said tissue gripping members each comprising:

• a camming portion having a pivot aperture and a cam slot;
• a tissue gripping portion extending from said camming portion, said tissue gripping portion having a tissue gripping surface defining a length and a transverse width, said tissue gripping surface including a plurality of rib members each extending in a lengthwise direction from said camming portion to a distal end portion of said tissue gripping member and being spaced transversely from one another, each of said rib member having a predetermined depth;
• and
• at least one indentation in said tissue gripping surface for enhancing gripping of tissue, said indentation extending at least over about fifty percent of said predetermined depth of said rib members.

A tool mechanism for an endoscopic surgical instrument for grasping tissue, said mechanism including a pair of tissue gripping members in opposing relation reciprocatingly movable toward and away from each other, said tissue gripping members each comprising:

• a camming portion having a pivot aperture and a cam slot;
• a tissue gripping portion extending from said camming portion, said gripping portion having a tissue gripping surface defining a length and a transverse width, said tissue gripping surface including a plurality of rib members each extending in a lengthwise direction from said camming portion to a distal end portion of said tissue gripping member and being spaced transversely from one another, each rib member having a predetermined depth;
• and
• at least one indentation in said tissue gripping surface for enhancing gripping of tissue, said at least one indentation having a longitudinal dimension at least greater than a transverse dimension between said rib members.

An endoscopic surgical instrument for grasping tissue having a handle mechanism, a body portion defining a longitudinal axis and having proximal and distal end portions, said body portion being supported at said proximal end portion by said handle mechanism and including an inner rod reciprocatingly slidable in an outer tube in response to movement of said handle mechanism, said inner rod having a bearing post at a distal end portion thereof, and a tissue gripping mechanism extending from said body portion at said distal end portion of said body portion and being operable to open and close in response to movement of said inner rod and said bearing post, said tissue gripping mechanism comprising:

• a pair of tissue gripping members in opposed relation, said tissue gripping members each including an elongated slot defining a camming surface slidably engageable by said bearing post when said inner rod member is moved in proximal and distal directions, said tissue gripping members having a plurality of rib members each extending in a direction along said longitudinal axis with respect to the length of said tissue gripping members and having a predetermined depth, said rib members forming at least two arrays of rib members having a spacing between said arrays, said spacing forming a generally transverse indentation with respect to said rib members which extends over at least approximately fifty percent of said predetermined depth thereof for enhancing gripping of tissue by permitting expansion of tissue thereinto during gripping.

An endoscopic surgical instrument for grasping tissue comprising:

• a handle assembly;
• a body portion extending from said handle assembly and defining a longitudinal axis, said body portion comprising a rod member having a bearing post at a distal end portion;
• a pair of tissue gripping members positioned at an end of said body portion opposite said handle assembly and being operable to open and close about a common pivot pin in response to movement of said handle assembly, said tissue gripping members each having an elongated slot defining a camming surface slidably engageable by said bearing post when said rod member is moved in proximal and distal directions;
• and
• said tissue gripping members each having a gripping surface including a plurality of rib members each extending in a direction along said longitudinal axis from a proximal end portion adjacent said common pivot pin to a distal end portion of the tissue gripping members, said rib members of each tissue gripping member having an undulating cross-sectional configuration with arcuate leading edges corresponding in shape to inverse arcuate leading edges of the rib members of the opposite tissue gripping member;
• wherein at least one of said tissue gripping members includes at least one depression in said gripping surface for enhancing gripping of tissue, said at least one depression being disposed on said gripping surface intermediate said proximal and said distal end portions, said at least one depression having a longitudinal dimension at least greater than a transverse dimension between said rib members.