Joint displacement measurement apparatus

Details Joint displacement measurement apparatus Joint displacement measurement apparatus

1993-12-10

1995-07-25

Rimell, Sam

Surgery

Truss

Pad

128774, 33511, 33515, A61B 500

Patent

active

054353211

ABSTRACT:
The measurement device includes a frame with a support and mounting member, a longitudinal bar, a lateral bar pivotally and slidably attached to the longitudinal bar with a pair of stirrups or heel cups attached symmetrically on either side of the longitudinal bar at a known distance from the longitudinal bar. A plurality of potentiometers or other resistive measurement devices are attached to the two bars to provide analog measurements of lengthwise and angular displacement. A microprocessor controller calculates actual leg length and offset by combining the measurements obtained from the first two resistive elements using a simple trigonometric function. An output means in the form of an LED and/or LCD display provides a visual display of the calculated actual and offset values.

REFERENCES:
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patent: 3270558 (1966-09-01), Barret et al.
patent: 4030213 (1977-07-01), Gregory
patent: 4549555 (1985-10-01), Fraser et al.
patent: 4823807 (1989-04-01), Russell et al.
patent: 4909262 (1990-03-01), Halpern et al.
patent: 5088504 (1992-02-01), Benesh et al.
patent: 5121753 (1992-06-01), Paez
patent: 5263492 (1993-11-01), Voyce

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