Isometry testing device
First Claim
1. A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a fastening means to an estimated placement point on the femur with strand means attached to the fastening means and extending away therefrom, said device comprising an elongated first barrel having a forward end, a rearward end, and a longitudinally extending center passage, a driver disposed in said center passage for projection and retraction through said forward end of said first barrel to engage and drive the fastening means into the femur, means for locking said driver in a projected position to engage the fastening means and a retracted position in said first barrel, means for positioning said forward end of said first barrel to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand means, and means for attaching said gauge to the rearward end of said first barrel, said gauge comprising means providing an excursion scale to indicate the movement of said strand means when the knee is flexed, tension means for applying a selected tension to the strand means, and means for gripping the strand means to said tension means, said barrel and said gauge being configured to hold the strand means as it extends away from the fastening means through the tibial tunnel into said first barrel to said gauge, whereby, when the strand means is gripped to said tension means to have the selected tension thereon and the knee is flexed, the excursion of the point at which the fastening means is attached will be represented on said excursion scale.
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Accused Products
Abstract
A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a screw to an estimated placement point on the femur with a strand attached to the screw and extending away therefrom. The device comprises a holder, a driver disposed in the holder to engage and drive the screw into the femur, a fitting for positioning the holder to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand, and means for attaching the gauge to the holder. The gauge comprises an excursion scale to indicate the movement of the strand when the knee is flexed, a spring for applying a selected tension to the strand, and a gripper for the strand. The holder and the gauge are configured to hold the strand as it extends away from the screw through the tibial tunnel to the gauge, whereby, when the strand is gripped to the spring to have the selected tension thereon and the knee is flexed, the excursion of the point at which the screw is attached will be represented on the excursion scale.
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Citations
15 Claims
- 1. A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a fastening means to an estimated placement point on the femur with strand means attached to the fastening means and extending away therefrom, said device comprising an elongated first barrel having a forward end, a rearward end, and a longitudinally extending center passage, a driver disposed in said center passage for projection and retraction through said forward end of said first barrel to engage and drive the fastening means into the femur, means for locking said driver in a projected position to engage the fastening means and a retracted position in said first barrel, means for positioning said forward end of said first barrel to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand means, and means for attaching said gauge to the rearward end of said first barrel, said gauge comprising means providing an excursion scale to indicate the movement of said strand means when the knee is flexed, tension means for applying a selected tension to the strand means, and means for gripping the strand means to said tension means, said barrel and said gauge being configured to hold the strand means as it extends away from the fastening means through the tibial tunnel into said first barrel to said gauge, whereby, when the strand means is gripped to said tension means to have the selected tension thereon and the knee is flexed, the excursion of the point at which the fastening means is attached will be represented on said excursion scale.
- 10. A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a fastening means to an estimated placement point on the femur with strand means attached to the fastening means and extending away therefrom, said device comprising a holder having a forward end, a rearward end, and a passage extending from end to end, a driver disposed in said passage for projection and retraction through said forward end to engage and drive the fastening means into the femur, means for locking said driver in a projected position to engage the fastening means and a retracted position in said holder, means for positioning said forward end to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand means, and means for attaching said gauge to the rearward end of said holder, said gauge comprising means providing an excursion scale to indicate the movement of said strand means when the knee is flexed, tension means for applying a selected tension to the strand means, and means for gripping the strand means to said tension means, said holder and said gauge being configured to hold the strand means as it extends away from the fastening means through the tibial tunnel into said holder to said gauge, whereby, when the strand means is gripped to said tension means to have the selected tension thereon and the knee is flexed, the excursion of the point at which the fastening means is attached will be represented on said excursion scale.
- 12. A device for determining the isometric point of a knee cruciate ligament replacement in a femur after a tibial tunnel has been prepared by attaching a fastening means to an estimated placement point on the femur with strand means attached to the fastening means and extending away therefrom, said device comprising a holder, a driver disposed in said holder to engage and drive the fastening means into the femur, means for positioning said holder to the mouth of the tunnel on the outer anterior tibial surface, a gauge calibrated to provide a selected tension on the strand means, and means for attaching said gauge to said holder, said gauge comprising means providing an excursion scale to indicate the movement of said strand means when the knee is flexed, tension means for applying a selected tension to the strand means, and means for gripping the strand means to said tension means, said holder and said gauge being configured to hold the strand means as it extends away from the fastening means through the tibial tunnel to said gauge, whereby, when the strand means is gripped to said tension means to have the selected tension thereon and the knee is flexed, the excursion of the point at which the fastening means is attached will be represented on said excursion scale.
Specification