Joint displacement measurement apparatus
US5435321A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Dec 10, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/6831
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.