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:
Jun. 18, 1991
Filed:
Sep. 01, 1988
A Maynard Engebretson, Ladue, MO (US);
Storz Instrument Company, St. Louis, MO (US);
Abstract
The implanted device includes a rectifier circuit which is switched between modes of half wave and full wave rectification in response to the signal to be conveyed. The external device is inductively coupled to the implanted device through a pair of coils, one coil being embedded beneath the skin, forming the primary and secondary windings of a transformer. The external device delivers energy to the implanted device in amounts which vary in accordance with the rectification mode of the implanted device. By monitoring the energy delivered, the external device determines the rectification modes as they are switched and thereby ascertains the signal being conveyed from the implanted device.