Method for adjusting a leg prosthesis and verifying the adjustment, and apparatus for the measurement of forces or moments in a leg prosthesis
First Claim
1. A method for verifying the adjustment of a leg prosthesis, wherein the leg prosthesis includes a prosthetic knee joint pivotally connected to an upper connection and a lower leg shaft, wherein the upper connection fixes the leg prosthesis on a user of the leg prosthesis and the lower leg shaft fastens to a prosthetic foot, and wherein the upper connection is displaceable in relation to a joint axis of the prosthetic knee joint, the method comprising:
- measuring a knee moment and an axial force by means of sensors when the leg prosthesis is being used;
calculating a resultant force vector using the knee moment and the axial force;
calculating a normal distance relative to the joint axis and the position of the resultant force vector in relation to the joint axis; and
verifying a position of the resultant force vector relative to the joint axis in the sagittal plane.
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Accused Products
Abstract
A method is provided for verifying the adjustment of a leg prosthesis. The leg prosthesis includes a prosthetic knee joint pivotally connected to an upper connection and a lower leg shaft. The upper connection fixes the leg prosthesis on a user of the leg prosthesis and the lower leg shaft fastens to a prosthetic foot. The upper connection is displaceable in relation to a joint axis of the prosthetic knee joint. The method includes measuring a knee moment and an axial force by means of sensors when leg prosthesis is being used; calculating a resultant force vector using the knee moment and the axial force; calculating a normal distance relative to the joint axis and the position of the resultant force vector in relation to the joint axis; and verifying a position of the resultant force vector relative to the joint axis in the sagittal plane.
77 Citations
27 Claims
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1. A method for verifying the adjustment of a leg prosthesis, wherein the leg prosthesis includes a prosthetic knee joint pivotally connected to an upper connection and a lower leg shaft, wherein the upper connection fixes the leg prosthesis on a user of the leg prosthesis and the lower leg shaft fastens to a prosthetic foot, and wherein the upper connection is displaceable in relation to a joint axis of the prosthetic knee joint, the method comprising:
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measuring a knee moment and an axial force by means of sensors when the leg prosthesis is being used; calculating a resultant force vector using the knee moment and the axial force; calculating a normal distance relative to the joint axis and the position of the resultant force vector in relation to the joint axis; and verifying a position of the resultant force vector relative to the joint axis in the sagittal plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for adjusting a leg prosthesis having a prosthetic knee joint pivotally connecting an upper connection for fixing the leg prosthesis on a prosthesis user and a lower leg shaft to which a prosthetic foot is fastened, wherein the upper connection is displaceable in relation to a joint axis of the prosthetic knee joint and/or the position of the prosthetic foot in relation to the lower leg shaft, the method comprising:
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measuring a knee moment and an axial force by means of sensors when the prosthesis is being used; calculating a resultant force vector using the knee moment and the axial force; calculating a normal distance in relation to the joint axis and the position of the resultant force vector in relation to the joint axis; verifying a position of the resultant force vector relative to the joint axis in a sagittal plane; and adjusting the upper connection in relation to an axis of the prosthetic knee joint and/or extension stops for the prosthetic knee joint and/or a prosthetic foot joint based on the position of the resultant force vector. - View Dependent Claims (19)
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20. An apparatus for measuring forces or moments in a leg prosthesis having a prosthetic joint comprising:
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an upper part connectable to an upper connection for fastening to a user of the prosthesis; a lower part jointly connected to the upper part; connecting means for fastening the upper part to the upper connection; and means for detecting knee forces or moments provided on one of the connecting means and the upper part, wherein the detected knee forces or moments are used to verify an adjustment of the leg prosthesis. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification