Abstract:
Screw-based primary fixation (5) of the prosthetic components within the medullary cavity solves the problem of micro-movements encountered in conventional press fit cementless fixation. For a total hip prosthesis (10), the stem (1) is fixed to the medial cortex of the proximal femur by the medial approach alone, obviating the need for drilling of the lateral cortex. The stem (1) may be implanted using a special drill guide instrumentation. Anchoring screws (5) are locked into the stem (1) of the femoral component (10), while self cutting threads on the screw heads (17) engage the pre-drilled medial cortex. This novel fixation principle can also be applied to other joint prosthesis, e.g. finger, shoulder, elbow and knee, as well as to dental and spinal implants.
Abstract:
A device for treating fractures comprises an intramedullary member (1) sized and shaped for insertion along a longitudinal axis of a bone within a medullary canal thereof, the intramedullary member including a bore extending laterally there through and a lateral implant (3) sized for insertion into the bone through the bore, a distal portion of the lateral implant including a plurality of substantially helical blades in combination with a sleeve (4) slidably received over a proximal portion of the lateral implant, the sleeve being non-rotatably received on the proximal portion of the lateral implant and a locking member for locking the sleeve in a desired position within the bore.
Abstract:
An implant (10) for replacement of the proximal portion of a femur (12), and specifically for replacement of the natural femoral head is provided. The implant (10) includes a body member (14) for insertion, in use, through the natural femoral neck (8) and in substantial alignment therewith, a head member (16) with a spherical portion for engagement with a natural or a prosthetic hip socket, and an optional sleeve (18) for altering the position of the spherical portion of the head member (16), relative to the body member (14). The body member (14) may also include a collar (20) designed to rest on the resected surface of the remaining intact natural femoral neck (8). A member for joining the head member (16) to the body member (14) is further provided which may integrally join the head (16) and body (14) members or, where the implant (10) is comprised of modular components, the joining member may be in the form of a protrusion (26) or a recess (52) on the body member (14) for engaging a complementary recess (28) or protrusion (56), respectively, on the head member (16).
Abstract:
A scalable modular hip resurfacing arthroplasty system includes (1) an alignment guide 204 for precise guide pin insertion, (2) a modular cannulated cylindrical reamer assembly 710 for accurate femoral head cylindrical reaming and central bone channel drilling, (3) a saw guide 1004 for an accurate femoral head osteotomy, (4) a soft tissue protector 1200 with a stepped design to shield and retract tissues, (5) a hip retractor 1500 that seats onto a prepared femur, (6) an outer hole drill guide 1700 aiding drilling of peripheral holes, and (7) a femoral resurfacing implant 2010 with a cap portion and central stem adapted for multiple modular attachments including plates. A method for preparing the proximal femur for hip resurfacing with novel stepped cylindrical femoral head osteotomy and central bone channel drilling, leaving an intact collar of cortical bone above the femoral head articular rim.
Abstract:
A method for computer assisted determination of positioning parameters of a medical device (1; 3) relative to a target structure (10) comprising the steps of A) obtaining a medical image (50) of a medical device (1) which comprises a cylindrical reference means (16) and of a target structure (10) by means of a radiographic device (20), wherein the cylindrical reference means (16) has a different density than the surrounding material of the medical device (1), B) determining an actual first position of the medical device (1) with respect to a local system of coordinates (24) fixed with the radiographic device (20), C) calculating the actual first position of the target structure (10) relative to the medical device (1), D) retrieving a desired second position of the medical device (1) relative to the target structure (10) and/or retrieving a virtual geometric representation of an additional medical device (3) using the computer (32), E) calculating values of correction parameters between the actual first position and the desired second position of the medical device (1) relative to the target structure (10) and/or values defining a desired position of the additional medical device (3) relative to the medical device (1) by means of the computer (32). A device for computer assisted positioning of a medical device (1) relative to a target structure (10) or to a reference base including a) a radiographic device (20), b) a computer (32) electronically connected to the radiographic device (20) and c) a medical device (1) comprising a cylindrical reference means (16), wherein the cylindrical reference means (16) has a different density than the surrounding material of the medical device (1), a longitudinal axis (18), a height h, a diameter d and a centre (47), wherein d) the computer (32) is suitably programmed to perform steps B) - F) of the method according to the invention.
Abstract:
A surgical device (10) to insert and attach, inside a bone of a limb, an oblong prosthesis (12) provided, in predefined positions, with transverse attachment holes (13, 15, 17), comprises a support element (16) able to be temporarily coupled with the oblong prosthesis (12) in order to insert the oblong prosthesis (12) into the bone (14), and a holing template (40) able to be selectively coupled in a predetermined position with the support element (16), outside the limb. The holing template (40) is coherent with the oblong prosthesis (12) and is able to reproduce at least the predefined position of one or more of the transverse attachment holes (13, 15, 17).
Abstract:
The instantly disclosed implant is designed to resurface or partially replace (two versions) the arthritic or osteonecrotic femoral head in an anatomic fashion with maximum fixation, durability and stability. It will serve a wide range of patient ages, arthritic/traumatic deformity, and bone pathologies while providing for high performance activity. The implant has absolute fixation utilizing existing, contoured femoral head bone with or without bone cement/porous texturing, an internal plate with modular head attachment, and advantageously benefit from the concurrent use of precision guided instrumentation. This implant optimizes maximal femoral head contact with or without porous contact surfaces but does not rely purely on the head for long term stability. This new concept prevents the common failure mechanisms of femoral neck fracture, loosening and malpositioning as well as makes patient bone quality less important for this high performance hip resurfacing implant.
Abstract:
Screw-based primary fixation (5) of the prosthetic components within the medullary cavity solves the problem of micro-movements encountered in conventional press fit cementless fixation. For a total hip prosthesis (10), the stem (1) is fixed to the medial cortex of the proximal femur by the medial approach alone, obviating the need for drilling of the lateral cortex. The stem (1) may be implanted using a special drill guide instrumentation. Anchoring screws (5) are locked into the stem (1) of the femoral component (10), while self cutting threads on the screw heads (17) engage the pre-drilled medial cortex. This novel fixation principle can also be applied to other joint prosthesis, e.g. finger, shoulder, elbow and knee, as well as to dental and spinal implants.
Abstract:
A scalable modular hip resurfacing arthroplasty system includes (1) an alignment guide 204 for precise guide pin insertion, (2) a modular cannulated cylindrical reamer assembly 710 for accurate femoral head cylindrical reaming and central bone channel drilling, (3) a saw guide 1004 for an accurate femoral head osteotomy, (4) a soft tissue protector 1200 with a stepped design to shield and retract tissues, (5) a hip retractor 1500 that seats onto a prepared femur, (6) an outer hole drill guide 1700 aiding drilling of peripheral holes, and (7) a femoral resurfacing implant 2010 with a cap portion and central stem adapted for multiple modular attachments including plates. A method for preparing the proximal femur for hip resurfacing with novel stepped cylindrical femoral head osteotomy and central bone channel drilling, leaving an intact collar of cortical bone above the femoral head articular rim.
Abstract:
A guide for assisting with attachment of a stock prosthetic implant to a patient tissue includes a lower guide surface configured to contact an upper implant surface of the stock prosthetic implant when a lower implant surface of the stock prosthetic implant contacts the patient tissue. An upper guide surface is accessible to a user when the lower guide surface is in contact with the upper implant surface. At least one guiding aperture extends through the guide body between the upper and lower guide surfaces at a predetermined aperture location with respect to the guide body and defines a predetermined target trajectory through the guide body. At least one of the target trajectory and the aperture location of each guiding aperture is preselected responsive to preoperative imaging of the patient tissue. A method of assisting with attachment of a stock prosthetic implant to a patient tissue is also provided.