Coherent inductive communications link for biomedical applications
First Claim
1. A communications link for communicating with a programmable medical device adapted to be biologically implanted in a living body, comprising:
- an internal receiver located in said programmable medical device;
an external transmitter adapted to be located extracorporeal to said living body;
means for establishing an inductive field between said external transmitter and said internal receiver;
a modulation means, incorporated in said external transmitter, for frequency shift keying said inductive field and for superimposing bit marks on said inductive field, so as to transmit digitally formatted information;
a bit mark detection means, incorporated within said internal receiver, for detecting said bit marks in said inductive field;
a limiter and zero crossing detector means, incorporated within said internal receiver, for detecting the zero crossing of the inductive field;
a digital discriminating means, connected in association with said bit mark detection means and said limiter and zero crossing detector means, for counting the number of zero crossings of said inductive field for a preset interval after said bit mark to establish the frequency of the inductive field, wherein said frequency indicates the received binary digit.
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Accused Products
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.
440 Citations
20 Claims
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1. A communications link for communicating with a programmable medical device adapted to be biologically implanted in a living body, comprising:
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an internal receiver located in said programmable medical device; an external transmitter adapted to be located extracorporeal to said living body; means for establishing an inductive field between said external transmitter and said internal receiver; a modulation means, incorporated in said external transmitter, for frequency shift keying said inductive field and for superimposing bit marks on said inductive field, so as to transmit digitally formatted information; a bit mark detection means, incorporated within said internal receiver, for detecting said bit marks in said inductive field; a limiter and zero crossing detector means, incorporated within said internal receiver, for detecting the zero crossing of the inductive field; a digital discriminating means, connected in association with said bit mark detection means and said limiter and zero crossing detector means, for counting the number of zero crossings of said inductive field for a preset interval after said bit mark to establish the frequency of the inductive field, wherein said frequency indicates the received binary digit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification