Femoral adjustment device and associated method
First Claim
Patent Images
1. A femoral adjustment device to balance a flexion gap, the device comprising:
- a body attachable to a distal femur, the body including a first elongated channel along a first axis;
a frame movably coupled to the body, the frame including a first column member slidably received in the first channel and an elongated first cutting member substantially perpendicular to the first axis, the first cutting member including an elongated a first cutting guide substantially perpendicular to the first axis; and
an adjustment mechanism operable to balance the flexion gap, wherein upon balancing the flexion gap, the first cutting guide is operable to guide at least one cut in the distal femur, the adjustment mechanism including;
a linear adjustment mechanism operable to adjust a linear displacement of the cutting guide relative to the distal femur in a direction parallel to the first axis, the linear adjustment mechanism including a post substantially parallel to the first axis and a knob threadably connected to the post, the post coupled to the first cutting member such that rotating the knob incrementally moves the first cutting guide along the first axis relative to the body; and
a rotational adjustment mechanism operable to adjust a rotational displacement of the first cutting guide relative to the body,wherein the rotational adjustment mechanism comprises a rotational member, the rotational member having first and second ends and a width tapering from the second end to the first end, the rotational member received in a recess of the body, the rotational member pivotably coupled to the body at a the first end about a second axis substantially perpendicular to the body and to the first cutting guide, the rotational member releasably coupled to the body at the second end for permitting relative rotation between the body and the rotational member.
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Abstract
A femoral adjustment device to balance a flexion gap. The device includes a body attachable to a distal femur, the body having a cutting guide and an adjustment mechanism operable to balance the flexion gap, wherein upon balancing the flexion gap, the cutting guide is operable to guide at least one cut in the distal femur.
551 Citations
12 Claims
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1. A femoral adjustment device to balance a flexion gap, the device comprising:
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a body attachable to a distal femur, the body including a first elongated channel along a first axis; a frame movably coupled to the body, the frame including a first column member slidably received in the first channel and an elongated first cutting member substantially perpendicular to the first axis, the first cutting member including an elongated a first cutting guide substantially perpendicular to the first axis; and an adjustment mechanism operable to balance the flexion gap, wherein upon balancing the flexion gap, the first cutting guide is operable to guide at least one cut in the distal femur, the adjustment mechanism including; a linear adjustment mechanism operable to adjust a linear displacement of the cutting guide relative to the distal femur in a direction parallel to the first axis, the linear adjustment mechanism including a post substantially parallel to the first axis and a knob threadably connected to the post, the post coupled to the first cutting member such that rotating the knob incrementally moves the first cutting guide along the first axis relative to the body; and a rotational adjustment mechanism operable to adjust a rotational displacement of the first cutting guide relative to the body, wherein the rotational adjustment mechanism comprises a rotational member, the rotational member having first and second ends and a width tapering from the second end to the first end, the rotational member received in a recess of the body, the rotational member pivotably coupled to the body at a the first end about a second axis substantially perpendicular to the body and to the first cutting guide, the rotational member releasably coupled to the body at the second end for permitting relative rotation between the body and the rotational member. - View Dependent Claims (2, 3, 4, 5)
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6. A method for balancing a flexion gap in a knee procedure, the method comprising:
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attaching a femoral adjustment device to a distal femur, the femoral adjustment device having a body and a cutting member with an elongated cutting guide slidably connected to the body along a first axis substantially perpendicular to the cutting guide; selectively adjusting a linear distance between the cutting guide and the body along the first axis by rotating a knob threadably connected to a post coupled to the body and the cutting member, the post substantially perpendicular to the cutting guide and substantially parallel to the first axis; selectively adjusting an orientation of the cutting guide relative to the body by rotating a rotational member, the rotational member pivotably coupled to the body at a first end and releasably connected to the body at a second end, the rotational member received in a recess of the body; balancing a flexion gap relative to the distal femur by selectively adjusting the linear distance and orientation of the cutting guide; and guiding a cut. - View Dependent Claims (7, 8, 9, 10)
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11. A femoral adjustment device to balance a flexion gap, the device comprising:
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a body attachable to a distal femur, the body including a first elongated channel along a first axis and a drilling slot elongated in the direction of the first axis; a frame including a first column member slidably received in the first channel; and an adjustment mechanism operable to balance the flexion gap, the adjustment mechanism including; a linear adjustment mechanism operable to adjust a linear displacement of the body relative to the distal femur in a direction substantially parallel to the first axis, the linear adjustment mechanism including a post substantially parallel to the first axis and a knob threadably connected to the post, the post coupled to the frame such that rotating the knob incrementally moves the frame along the first axis relative to the body; and a rotational adjustment mechanism operable to adjust a rotational displacement of the body relative to the distal femur, the rotational adjustment mechanism including a rotational member rotatable relative to the body, the rotational member having an elongated curved slot communicating with the drilling slot of the body for guiding a drill, wherein the rotational member is pivotably coupled to the body at a first end and releasably connected to the body at a second end, the rotational member received in a recess of the body.
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12. A femoral adjustment device to balance a flexion gap, the device comprising:
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a body attachable to a distal femur, the body including an elongated channel along a first axis and a drilling slot elongated in the direction of the first axis; a frame including a first column member slidably received in the channel and a cutting member substantially perpendicular to the first axis, the cutting member including a cutting guide substantially perpendicular to the first axis; and an adjustment mechanism operable to balance the flexion gap, wherein upon balancing the flexion gap, the cutting guide is operable to guide at least one cut in the distal femur, the adjustment mechanism including; a linear adjustment mechanism operable to adjust a linear displacement of the cutting guide relative to the distal femur in a direction parallel to the first axis, the linear adjustment mechanism including a post substantially parallel to the first axis and a knob threadably connected to the post, the post coupled to the cutting member such that rotating the knob incrementally moves the cutting guide along the first axis relative to the body; and a rotational adjustment mechanism operable to adjust a rotational displacement of the cutting guide relative to the distal femur, the rotational adjustment mechanism including a rotational member rotatable relative to the body, the rotational member having an elongated curved slot communicating with the drilling slot of the body for guiding a drill, wherein the rotational member is pivotably coupled to the body at a first end and releasably connected to the body at a second end, the rotational member received in a recess of the body.
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Specification