Minimally invasive surgical clamps, assemblies and methods

摘要

A minimally invasive surgical assembly broadly includes an outer tube which has an outer diameter of 3.0 mm or smaller, and a coaxial surgical instrument having a shaft which extends through the outer hollow tube. The coaxial surgical instrument includes end effectors at the end of the shaft. The end effectors include spring arms and wire frame clamp elements defining fenestrations. The spring arms are biased to an open position such that when the end effectors of the surgical instrument extend out of the outer tube they open, and they are closed by relative movement of the outer tube over them. The wire frame clamp elements are biased to an open position such that when they extend out of the outer tube they open and they are closed by relative movement of the outer tube over them.

主权项

1. A surgical assembly, comprising:
a hollow tube having an outer diameter of 3 mm or less and an inner diameter; and a surgical instrument having a shaft which extends through said hollow tube, said surgical instrument being movable relative to said hollow tube and including first and second end effectors at an end of said shaft, said first and second end effectors having corresponding first and second unitary spring arms extending to corresponding first and second clamp elements, the first clamp element including a first closed-loop wire frame that defines a corresponding first fenestration wherein the first closed-loop wire frame defines a closed loop that completely encircles the corresponding first fenestration and is disposed distally relative to the first unitary spring arm, the second clamp element including a second closed-loop wire frame that defines a corresponding second fenestration wherein the second closed-loop wire frame defines a closed loop that completely encircles the corresponding second fenestration and is disposed distally relative to the second unitary spring arm, wherein said first and second unitary spring arms are biased to an open position, when said first and second unitary spring arms extend sufficiently out of said hollow tube, such that said first and second clamp elements span a distance at least twice the outer diameter of said hollow tube, wherein, when said hollow tube extends sufficiently over said first and second unitary spring arms, said first and second clamp elements are forced into a closed position adjacent each other, and said first and second clamp elements are configured so that areas of the first and second fenestrations in said closed position of said first and second clamp elements are reduced relative to corresponding areas of the first and second fenestrations in said open position of said first and second unitary spring arms, wherein said first and second unitary spring arms open and close relative to one another in a first direction, and the areas of the first and second fenestrations reduce in size by bending of the respective first and second closed-loop wire frames of said first and second clamp elements in a second direction orthogonal to said first direction independent of movement of said first and second unitary spring arms, and wherein the first and second fenestrations of said first and second clamp elements are fully expanded when the first and second closed-loop wire frames initially extend completely out of said hollow tube, in a distal direction, while inner clamping surfaces of said first and second clamp elements remain in contact with each other as the first and second fenestrations expand in size.