Distal bone anchors for bone fixation with secondary compression
First Claim
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1. A femoral neck fracture fixation device, comprising:
- an elongate body, having a proximal end and a distal end;
a helical anchor on the distal end, the helical anchor being wrapped about a minor diameter and an outer edge of the helical anchor defining an outer boundary;
a first retention structure on the body, proximal to the anchor; and
a proximal anchor, moveably carried by the body, wherein the proximal anchor is movable in the distal direction with respect to the body and the retention structure resists proximal movement of the proximal anchor with respect to the body.
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Abstract
Disclosed is a bone fracture fixation device, such as for reducing and compressing fractures in the proximal femur. The fixation device includes an elongate body with a helical cancellous bone anchor on a distal end. An axially moveable proximal anchor is carried by the proximal end of the fixation device. The device is rotated into position across the fracture or separation between adjacent bones and into the adjacent bone or bone fragment, and the proximal anchor is distally advanced to apply secondary compression and lock the device into place. The device may also be used for soft tissue attachments.
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Citations
52 Claims
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1. A femoral neck fracture fixation device, comprising:
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an elongate body, having a proximal end and a distal end;
a helical anchor on the distal end, the helical anchor being wrapped about a minor diameter and an outer edge of the helical anchor defining an outer boundary;
a first retention structure on the body, proximal to the anchor; and
a proximal anchor, moveably carried by the body, wherein the proximal anchor is movable in the distal direction with respect to the body and the retention structure resists proximal movement of the proximal anchor with respect to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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8. A femoral neck fracture fixation device as in claim 8, wherein the outer boundary and the minor diameter are generally cylindrical.
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26. A bone fracture fixation device, comprising:
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an elongate body having a proximal end and a distal end;
a cancellous bone anchor on the distal end;
the cancellous bone anchor comprising a helical flange wrapped about a central core or axial lumen, an outer edge of the helical anchor defining an outer boundary and the central core or axial lumen defining a minor diameter;
a proximal anchor axially movably carried on the body; and
complimentary surface structures in between the body and the proximal anchor that permit advancing the proximal anchor in the distal direction to tighten the fixation device but that resist axial proximal movement of the proximal anchor. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A bone fracture fixation device, comprising:
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an elongate body, having a proximal end and a distal end;
a helical anchor on the distal end, a first retention structure on the body, proximal to the anchor; and
a proximal anchor, moveably carried by the body and having a tubular housing, the tubular housing having at least one barb extending radially outwardly from the tubular housing and defining an engagement surface that lies within a plane that is transverse to a longitudinal axis of the tubular housing, wherein the proximal anchor is movable in the distal direction with respect to the body and the retention structure resists proximal movement of the proximal anchor with respect to the body. - View Dependent Claims (52)
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Specification