Method and apparatus for recording activity in intact nerves
US3957036A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1975 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Feb 3, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/29
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus is provided which will attenuate bioelectric interference when measuring the activity in an intact nerve. An electrode probe is provided having first and second electrodes positioned on opposite sides of a thin, flexible, insulating carrier. The probe is inserted between the nerve to be measured and the underlying body tissue with one electrode contacting only the nerve and the second electrode contacting only the tissue. The nerve and the tissue thereby form in effect a Wheatstone bridge about the carrier and the symmetrical electrodes which thus provides a nulling effect on extraneous electrical potentials, while a measurement of nerve potentials appearing as a voltage difference between the electrodes provides a measurement of activity in the nerve. Additional, symmetrical pairs of electrodes may be positioned on the same carrier, and their outputs may electronically be combined for increasing the signal-to-noise ratio in the measurement. The apparatus may also be implanted in a body by covering the first electrode and the portion of the nerve in contact with the electrode with a second insulator which is preferably bonded to the first insulator, the elect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.