Bone fixation system with radially extendable anchor
First Claim
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1. A bone fixation device, for securing a first bone fragment to a second bone fragment, comprising:
- an elongate pin, having a proximal end and a distal end;
at least one axially advanceable anchor carried by the pin;
an actuator, axially moveable with respect to the pin in a distal and a proximal direction, wherein axial proximal movement of the pin with respect to the actuator causes at least a portion of the anchor to advance along a path which is inclined radially outwardly from the pin in the proximal direction;
a retention member, axially moveable with respect to the pin, and at least one retention structure in between the pin and the retention member for permitting proximal movement of the pin with respect to the retention member but resisting distal movement of the pin with respect to the retention member.
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Abstract
Disclosed is a bone fixation device of the type useful for connecting soft tissue or tendon to bone or for connecting two or more bones or bone fragments together. The device comprises an elongate body having a distal anchor thereon, an actuator and a retention member. The retention member includes a proximal anchor that is axially movably disposed with respect to the distal anchor, to accommodate different bone dimensions and permit appropriate tensioning of the fixation device.
238 Citations
30 Claims
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1. A bone fixation device, for securing a first bone fragment to a second bone fragment, comprising:
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an elongate pin, having a proximal end and a distal end;
at least one axially advanceable anchor carried by the pin;
an actuator, axially moveable with respect to the pin in a distal and a proximal direction, wherein axial proximal movement of the pin with respect to the actuator causes at least a portion of the anchor to advance along a path which is inclined radially outwardly from the pin in the proximal direction;
a retention member, axially moveable with respect to the pin, and at least one retention structure in between the pin and the retention member for permitting proximal movement of the pin with respect to the retention member but resisting distal movement of the pin with respect to the retention member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A bone fixation system for fixing two or more bone fragments, comprising:
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a first elongate tubular body, having a proximal end, a distal end and a longitudinal axis;
a distal anchor on the fixation device, moveable from an axial orientation for distal insertion through a bore in the bone to an inclined orientation to resist axial movement through the bore;
an elongate pin axially moveable within the first tubular body and linked to the anchor such that proximal retraction of the pin with respect to the tubular body advances the distal anchor from the axial orientation to the inclined orientation;
a second elongate tubular body, having a proximal end, a distal end and a longitudinal axis; and
at least one retention structure in between the second elongate tubular body and the elongate pin, for permitting proximal movement of the elongate pin with respect to the second elongate tubular body but resisting distal movement of the pin with respect to the second elongate tubular body. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of implanting a fixation device in a bone, comprising the steps of:
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advancing an elongated pin and an actuator into the bone, the actuator being axially moveable with respect to the elongated pin;
axially moving the elongated pin with respect to the actuator;
engaging an anchor into bone in response to the axially moving step;
removing the actuator from the bone;
distally advancing a retention member along the fixation device, the retention member being configured to resist distal movement of the pin with respect to the retention member, and proximally retracting the elongated pin with respect to the retention member. - View Dependent Claims (21, 22, 23, 24)
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25. A method of fixing a first bone fragment with respect to a second bone fragment, comprising the steps of:
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advancing an elongated pin and an actuator through a first bone fragment and into a second bone fragment, the actuator being axially moveable with respect to the elongated pin. proximally retracting the elongated pin with respect to the actuator;
advancing at least one tine on the fixation device into bone in response to the proximally retracting step;
removing the actuator from the bone;
distally advancing a retention member over the fixation device, the retention member being configured to resist distal movement of the pin with respect to the retention member, and proximally retracting the elongated pin with respect to the retention member to fix the first bone fragment with respect to the second bone fragment. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification