Custom replacement device for resurfacing a femur and method of making the same
First Claim
1. A marking template for assisting drilling holes into a femur of a patient, comprising:
- a top surface;
a bottom surface;
the bottom surface substantially formed to match a distal end of a femur; and
an opening through the top and bottom surfaces adapted to guide a drill at a predetermined location along the distal end of the femur.
1 Assignment
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Accused Products
Abstract
A replacement device for resurfacing a joint surface of a femur and a method of making and installing such a 5 device is provided. The custom replacement device is designed to substantially fit the trochlear groove surface, of an individual femur. Thereby creating a “customized” replacement device for that individual femur and maintaining the original kinematics of the joint. The replacement device may be defined by four boundary points, and a first and a second surface. The first of four points is 3 to 5 mm from the point of attachment of the anterior cruciate ligament to the femur. The second point is near the bottom edge of the end of the natural articulatar cartilage. The third point is at the top ridge of the right condyle and the fourth point at the top ridge of the left condyle of the femur. The top surface is designed so as to maintain centrally directed tracking of the patella perpendicular to the plane established by the distal end of the femoral condyles and aligned with the center of the femoral head.
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Citations
19 Claims
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1. A marking template for assisting drilling holes into a femur of a patient, comprising:
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a top surface;
a bottom surface;
the bottom surface substantially formed to match a distal end of a femur; and
an opening through the top and bottom surfaces adapted to guide a drill at a predetermined location along the distal end of the femur.
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2. A system for installing a replacement device to a distal end of a femur having a trochlear groove surface, comprising:
- a marking template, wherein;
the marking template has a back side substantially matching the distal end of a femur; and
a hole through the marking template;
a drilling apparatus to form an opening on the distal end of the femur 5 assisted by the hole in the marking template; and
a replacement device, wherein;
the replacement device has a bottom side substantially matching the distal end of the femur; and
a pin protruding from the bottom side of the replacement device 10 adapted to insert into the opening on the distal end of the femur. - View Dependent Claims (3, 4, 5)
- a marking template, wherein;
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6. A method of making a replacement device, comprising the steps of:
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forming a model of a distal end of a patient'"'"'s femur;
forming a first mold from the model, wherein the first mold has a bottom side that substantially matches the trochlear groove of the patient'"'"'s femur, wherein the first mold has a top side opposite of the bottom side;
coupling a peg on a predetermined location on the bottom side of the first mold;
shaping the top side of the mold to substantially track the trochlear groove of the patient'"'"'s femur;
forming a second mold from the first mold; and
pouring viscous material into the second mold to make a replacement device. - View Dependent Claims (7, 8, 9, 10)
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11. A method of forming a replacement device and a marking template device from a single mold, comprising the steps of:
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forming a model of patient'"'"'s distal end of a femur;
forming a first mold from the model, wherein the first mold has a back 10 side that matches the trochlear groove of the femur, wherein the first mold has a face side opposite of the back side;
shaping the face side of the first mold to substantially track the trochlear groove of the femur;
forming a second mold from the first mold; and
pouring a first viscous material into the second mold to make a replacement device. - View Dependent Claims (12, 13, 14, 15)
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16. A method of installing a replacement device to the trochlear groove of a patient'"'"'s femur, comprising the steps of:
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providing a replacement device having a bottom side that substantially 15 matches the trochlear groove of a patient'"'"'s femur, wherein the bottom side of the replacement device has a pin at a predetermined location;
providing a marking template having a back side that substantially matches the trochlear groove of the patient'"'"'s femur, wherein the marking template has an opening corresponding to the predetermined location of the pin;
removing the cartilage from the distal end of the femur;
positioning the marking template about the femur substantially similar to the desired installed position of the replacement device;
drilling a hole on the distal end of the femur though the opening of the marking template;
removing the marking template from the femur; and
inserting the pin of the replacement device into the hole of the femur to install the replacement device on the desired location of the femur. - View Dependent Claims (17, 18, 19)
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Specification