Method for obtaining a signal for analyzing human and animal joint functions
US4986281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Jan 12, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B7/006
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A non-invasive, non-ionizing, reproducible method and apparatus for analyzing the normal and abnormal function of human and animal joints is presented. The method includes passing vibrations through the joint to be analyzed and measuring the modulation of the amplitude and the phase characteristics of the vibrations caused by movement of the joint through a predetermined cycle. More specifically, the method includes transmitting a sinusoidal vibratory signal through a joint structure to be analyzed and measuring the amplitude and phase of the signal received on the opposite side of the joint during a prescribed movement of the joint both with and without the application of external mechanical forces, and comparing the profile of the modulated signal to the profiles obtained from reference joints. The apparatus includes a piezoelectric or magnetic transducer adapted to be positioned on one side of a joint to be analyzed to provide the vibrational signal and one or more receiving transducers placed on the other side of the joint to detect the modulated vibratory signal produced by the associated joint structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.