The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 31, 1992
Filed:
Nov. 08, 1989
Mead C Killion, Elk Grove Village, IL (US);
Donald L Wilson, Roselle, IL (US);
Jonathan K Stewart, Bensenville, IL (US);
Etymotic Research, Inc., Elk Grove Village, IL (US);
Abstract
A system for detecting and transmitting body electrical signals in the presence of ambient electrical interference that uses a transmiter circuit including an amplifier coupled to and in close proximity to two or more body electrodes, a light pulse generator that receives its input from that amplifier and provides a pulse-duration-modulated series of light pulses, and a remote receiver including a transducer which demodulates the transmitted light pulses into electrical pulses of corresponding duration and frequency and a demodulator which accepts those electrical pulses and produces an amplified replica of the original signal developed between the body electrodes, thereby effectively providing complete electrical isolation of the electrode amplifier from the remaining bioelectrical signal analysis equipment. A valuable additional feature of the invention is a complete electrostatic shield around the amplifier-transmitter as well as the electode leads, so that the small amount of residual capacitive coupling to the amplifier circuit itself is effectively shunted to the same average (body) potential as that of the electrodes.