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OwnerBjorn Albrektsson, Stig Wennberginventors
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The invention relates to an arrangement for fixing a knee-joint in connection with prosthetic surgery. The arrangement provides for a fixing of the operated knee-joint relative to a reference, which is represented by the operating table. The purpose is to positionally control, with high precision, measuring and cutting instruments in the prosthesis operation. The arrangement includes an alignment instrument (11) for aligning and fixing both the femur (66) and tibia (21) relative to a reference axis in both the frontal plane and the sagittal plane, which alignment instrument comprises a fixture (4) for the trunk. The fixture is adjustable and can be locked in selected positions by displacement transverse to the reference axis. The alignment instrument also comprises a further fixture for fixing the knee-joint (20, 22) and tibia (21). The arrangement moreover comprises a positional control unit for positional control of measuring and cutting instruments. This permits a controlled, precise and delicate bone-cutting, which creates the conditions for the desired positioning and exact fitting between prosthesis bed and prosthesis.
Arrangement for fixing a knee-joint in defined positions and for positional control of instruments for replacing the knee-joint of a patient with a prosthesis, which arrangement is designed to be connected to an operating table (1) intended to support the patient, characterized in that the arrangement comprises, on the one hand, a stand (3) which can be connected to the operating table (1), an alignment instrument (2) which is supported by the stand and is used for aligning both femur and the tibia relative to a reference axis, and, on the other hand, a positional control unit (47) which can be connected to the stand in defined positions and is used for positional control of at least one instrument (48) relative to the knee-joint, which alignment instrument comprises a fixture (4), supported by the stand, for the trunk of the patient, which trunk fixture is adjustable and can be locked in selected positions by displacement transverse to the said reference axis, and a limb fixture, supported by the stand, for fixing the knee-joint (20, 22) and ankle-joint (23) of the patient, in that the said limb fixture (11) for fixing the knee-joint and ankle-joint consists of a fixation frame which is pivotably mounted on the stand by means of a pivot hinge (13) and which, by means of its pivotability, can be set in different angular positions relative to the operating table.
Dependencies are inferred from the claim text.