Plate inserter tool
Disclosed is plate insertion tool useful with bone plates having a body and a pair of retainers, such as facing, inwardly extending fingers, for clamping a bone plate therebetween, and a pusher movable relative to the body between a fully disengaged position and a fully engaged position, the pusher in use engaging a shoulder of the compression plate. When the pusher is in an engaged position, the legs of the plate are temporarily tensioned by bending the legs away from the body of the plate. The body of the tool includes a pivot joint about which said pusher pivots. The tool may be used to temporarily tension the legs of the plate prior to insertion into holes in a bone.
1 . A plate insertion tool for use with a compression plate having a plate body with one or more apertures each for receiving a screw and at least one leg at one end of the plate body, the plate insertion tool being usable to temporarily tension the legs prior to insertion into holes in a bone, the plate insertion tool comprising:
a body;
a pair of plate retainers at least one of which is movable with respect to the body over a range of travel between a clamping position and a fully open position, the plate retainers in use clamping a portion of the compression plate therebetween, the plate retainers being closer to each other in the clamping position as compared to the fully open position; and
a pusher movable relative to the body over a range of travel between a fully disengaged position and a fully engaged position and positioned for engaging, in use, the compression plate such that when the pusher moves towards the fully engaged position the at least one leg of the plate is temporarily tensioned by bending the at least one leg away from the plate body,
the body having a pivot joint about which said pusher pivots in moving over said range of travel between said fully disengaged position and said fully engaged position.
2 . The plate insertion tool of claim 1 , the plate retainers comprising a pair of facing, inwardly extending fingers each movable with respect to the body.
3 . The plate insertion tool of claim 2 , further comprising a first arm having one of the pair of inwardly extending fingers and a second arm having the other of the pair of inwardly extending fingers, the first and second arms being slidably mounted relative to the body for sliding relative to each other and the body.
4 . The plate insertion tool of claim 3 , wherein:
the first arm has a first arm actuator at an end portion thereof opposite the one of the pair of inwardly extending fingers;
the second arm has a second arm actuator at an end portion thereof opposite the other of the pair of inwardly extending fingers;
the first arm actuator and the other of the pair of inwardly extending fingers being disposed on one side of the pusher and the second arm actuator and the other of the one of the pair of inwardly extending fingers being disposed on an opposite side of the pusher; and
at least one spring disposed between the first arm actuator and the second arm actuator to bias the first arm actuator and the second arm actuator away from each other.
5 . The plate insertion tool of claim 4 , the first arm including a first arm slot and the second arm including a second arm slot, the body including at least one retention pin disposed in the first arm slot and limiting the range of travel of said first arm.
6 . The plate insertion tool of claim 5 , the body including at least a second retention pin disposed in the second arm slot and limiting the range of travel of said second arm.
7 . The plate insertion tool of claim 1 , including a shaft that translates relative to the body, said shaft forming a portion of a linkage converting translation of said shaft to pivoting motion of said pusher.
8 . The plate insertion tool of claim 7 , said pusher being disposed on a linking member and said shaft being pivotally connected to said linking member.
9 . The plate insertion tool of claim 7 , said shaft comprising a threaded leadscrew.
10 . The plate insertion tool of claim 9 , further comprising a rotatable handle having an interior threaded surface that engages the threaded leadscrew to cause rotation of the shaft relative to the body upon rotation of the handle.
11 . The plate insertion tool of claim 10 , the shaft having a transverse proximal capture pin and the handle having narrowing distal threading, whereby the handle is captured on said leadscrew.
12 . An assembly comprising:
a compression plate having a body portion with one or more apertures each for receiving a bone screw and a pair of legs at one end that are each connected to the body portion of the plate and spaced apart by a shoulder; and
the plate insertion tool of claim 1 positioned to retain said plate for temporarily tensioning the legs of the plate.
13 . The assembly of claim 12 , the pusher engaging the shoulder of the plate.
14 . The assembly of claim 12 , the plate retainers comprising a pair of facing, inwardly extending fingers each movable with respect to the body and engaging the legs of the compression plate.
15 . A plate insertion method comprising
providing an assembly including a plate insertion tool retaining a compression plate, the compression plate having a body portion with one or more apertures each for receiving a screw and at least one leg at one end connected to the body,
the plate insertion tool comprising:
a pair of plate retainers at least one of which is movable with respect to the body over a range of travel between a clamping position and a fully open position, the plate retainers in use clamping a portion of the compression plate therebetween, the plate retainers being closer to each other in the clamping position as compared to the fully open position; and
a pusher movable relative to the body over a range of travel between a fully disengaged position and a fully engaged position and positioned for engaging, in use, the compression plate, and
the body having a pivot joint about which said pusher pivots in moving over said range of travel between said fully disengaged position and said fully engaged position;
moving the pusher towards the fully engaged position to cause the at least one leg of the plate to be temporarily tensioned by bending the leg away from the plate body;
screwing a bone screw through said at least one aperture;
inserting said at least one leg into a bone hole; and
separating said plate insertion tool from said plate whereby bone or bone fragments are compressed.
16 . The method of claim 15 , wherein the plate has a pair of legs and wherein said pair of legs is inserted into respective bone holes.