Coherent inductive communications link for biomedical applications

Patent 4561443 Issued on December 31, 1985. Estimated Expiration Date:

March 8, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

The Johns Hopkins University

Application

No. 06/473248 filed on 03/08/1983

US Classes:

607/31, Assurance of security, accuracy, or completion of programming procedure128/903, RADIO TELEMETRY604/65, Material flow varying means controlled by condition responsive sensor607/32Communicating with pacer (e.g., telemetry)

Examiners

Primary: Howell, Kyle L.
Assistant: Smith, Ruth S.

Attorney, Agent or Firm

International Classes

A61N 1/372 (20060101)
A61M 5/142 (20060101)

Abstract

A two-way coherent inductive communications link between an external transceiver and an internal transceiver located in a biologically implanted programmable medical device. Digitally formatted command data and programming data is transmitted to the implanted medical device by frequency shift keying the inductive communications link. Internal transceiver is powered by the inductive field between internal and external transceivers. Digitally formatted data is transmitted to external transceiver by internal transceiver amplitude modulating inductive field. Immediate verification of the establishment of a reliable communications link is provided by determining existence of frequency lock and bit phase lock between internal and external transceivers.