Jig for determining a patient-adapted implant size of the femoral implant of a knee endoprosthesis
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A knee joint prosthesis, implant technology, used in joint implants, joint implants, knee joints, etc.
Inactive Publication Date: 2017-08-29
WALDEMAR LINK GMBH & CO
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[0016] The purpose of the present invention is to deal with errors and solve the problems associated with them
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[0043] figure 2 An embodiment of a measuring tool for determining an implant size of a femoral implant suitable for a knee joint prosthesis of a patient according to the present invention is shown in the form of a rough exploded view. The measuring tool generally designated with the reference number 1 is used in the illustrated embodiment not only to determine the size of the implant, but also to determine and pre-specify the orientation of the external implant angle.
[0044] The measuring tool 1 first has a maintenance guide 2 on which a handle 3 is fixedly molded. When in use, the fitting piece 4 and the maintaining guide portion 2 are fixed and connected to each other in an immovable manner. The maintenance guide portion 2 and the fitting piece 4 thus constitute the base of the measuring tool 1.
[0045] The caliper member 7 is movably provided on the side-projecting guide rail 5 formed on the maintenance guide 2 along the measuring direction of the wire 6. The detection arm...
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Abstract
A jig (1) for determining a patient-adapted implant size of the femoral implant of a knee endoprosthesis is disclosed, wherein the jig (1) has the following: a main body (2, 4), a probe part (7) movable relative to the main body (2, 4) along a measuring direction (6), wherein the probe part (7) has a probe arm (8) with a probe tip (9) for placing on an anterior reference point of the distal end of the patient's femur, two contact pieces (11, 12) for respectively placing on and referencing the medial and the lateral posterior condyle of the distal end of the patient's femur, and at least one scale (23, 24) and an associated pointer (21, 22) for indicating a position of the probe part (7) in the measuring direction (6) relative to at least one of the contact pieces (11, 12) for defining a suitable implant size. In order to avoid measurement errors of the kind that occur particularly when simultaneously defining the external implant angle using known jigs, the invention proposes that the contact pieces (11, 12) are movable relative to the main body (2, 4) in such a way that a distance, projected in the measuring direction (6), of the probe tip (9) from the contact pieces (11, 12) is adjustable for the contact pieces (11, 12) in such a way that this distance is different with respect to the two contact pieces (11, 12), and such that, for each contact piece (11, 12), a dedicated scale (23, 24) and an associated pointer (21, 22) are provided for the indication of a position of the probe part (7) in the measuring direction (6) relative to the respective contact piece (11, 12) and for the resulting indication of a suitable implant size.
Description
Technical field [0001] The present invention relates to a measuring tool for determining the implant size of a femoral implant suitable for a knee joint prosthesis of a patient, which has the characteristics according to claim 1. In this case, it is especially possible to use the measuring tool for primary care, that is, the primary care of a worn natural knee joint with a prosthesis. Background technique [0002] It is well known that knee joints damaged by wear or other phenomena (such as tumors) that are no longer able to perform normal, especially painless, movement for relevant patients can be replaced with corresponding implants as a Replacement of the articular surface of the related bones on the distal femur and the dorsal tibial side. To this end, various well-known suppliers have launched corresponding implants or implant series for daily use by relevant patients on the market. [0003] Based on the different anatomical conditions of the respective patients, different i...
Claims
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