Laparoscopy forceps
First Claim
1. Laparoscopy forceps comprising at least:
- a yoke having an outside diameter that is constant over its entire functional length defined between its proximal end and its distal end and having a circularly cylindrical through hole defined between said proximal and distal ends;
two jaws having respective grip faces;
means for mounting the two jaws to the distal end of said through hole to pivot relative to said yoke about a first axis in such a manner that the two jaws are suitable for occupying all positions between two extreme positions, respectively an open position when the two grip faces of the respective jaws form a non-zero angle between each other, and a closed position when the two grip faces of the respective jaws form a substantially zero angle between each other;
a control rod mounted to move in translation in said through hole and defined between a proximal end and a distal end; and
pantograph-forming means for connecting the distal end of said control rod respectively to both of said jaws, said pantograph-forming means comprising;
two links;
means for mounting said two links via respective first ones of their two ends to the distal end of said rod to pivot relative to the control rod about a second axis;
two cams secured to respective ones of the two jaws at first ones of their two ends; and
means for mounting the second end of each link to the second end of a respective one of the cams to pivot respectively about a third axis and a fourth axis, said first, second, third, and fourth axes being defined so as to be parallel to one another,wherein;
the outside diameter of said yoke has a value equal to 2D;
the two links are identical, each being formed by a plate of rectangular cross-section with rounded ends, the width of each plate being equal to 2E;
the distance between the third and fourth pivot axes when the two grip faces of the jaws are in contact having a value 2C that is less than 2D; and
the angle between the axes of the two links when the two grip faces of the jaws are in the closed position being equal to 2A;
the values D, E, C, and A being substantiallyassociated by the following equation;
D=C+E/cos A and that;
the outer edge at the second end of each link has a substantially chamfered cylindrical portion of radius substantially equal to the radius of the outer surface of said yoke so that, when the two jaws are in the closed position, said pantograph-forming means are inscribed in and against an envelope surface defined by said outer surface of said yoke.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed are laparoscopy forceps, including a yoke with a hole, two jaws; a unit for mounting the jaws to pivot relative to the yoke about an axis; a control rod mounted to move in translation in the hole; a pantograph connecting the rod and two jaws using links mounted to pivot on the rod about an axis, two cams secured to the jaws, a mount for each link to pivot relative to a respective one of the two cams about axes, the four pivot axes being parallel, the outside diameter of the yoke being 2D, the width of the links being 2E, the distance between the axes when the two grip faces of the jaws are in contact being 2C, the angle under such circumstances between the axes being 2A, and the values D, E, C, and A being substantially associated by the following equation: D=C+E/cosA.
3 Citations
16 Claims
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1. Laparoscopy forceps comprising at least:
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a yoke having an outside diameter that is constant over its entire functional length defined between its proximal end and its distal end and having a circularly cylindrical through hole defined between said proximal and distal ends; two jaws having respective grip faces; means for mounting the two jaws to the distal end of said through hole to pivot relative to said yoke about a first axis in such a manner that the two jaws are suitable for occupying all positions between two extreme positions, respectively an open position when the two grip faces of the respective jaws form a non-zero angle between each other, and a closed position when the two grip faces of the respective jaws form a substantially zero angle between each other; a control rod mounted to move in translation in said through hole and defined between a proximal end and a distal end; and pantograph-forming means for connecting the distal end of said control rod respectively to both of said jaws, said pantograph-forming means comprising; two links; means for mounting said two links via respective first ones of their two ends to the distal end of said rod to pivot relative to the control rod about a second axis; two cams secured to respective ones of the two jaws at first ones of their two ends; and means for mounting the second end of each link to the second end of a respective one of the cams to pivot respectively about a third axis and a fourth axis, said first, second, third, and fourth axes being defined so as to be parallel to one another, wherein; the outside diameter of said yoke has a value equal to 2D; the two links are identical, each being formed by a plate of rectangular cross-section with rounded ends, the width of each plate being equal to 2E; the distance between the third and fourth pivot axes when the two grip faces of the jaws are in contact having a value 2C that is less than 2D; and the angle between the axes of the two links when the two grip faces of the jaws are in the closed position being equal to 2A; the values D, E, C, and A being substantially associated by the following equation;
D=C+E/cos Aand that; the outer edge at the second end of each link has a substantially chamfered cylindrical portion of radius substantially equal to the radius of the outer surface of said yoke so that, when the two jaws are in the closed position, said pantograph-forming means are inscribed in and against an envelope surface defined by said outer surface of said yoke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification