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EP0443496A2
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EP
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Telemetry apparatus for implantable tissue stimulator
Assignee: Pacesetter Inc
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Filing: 1991-02-18
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Granted: —
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Expires: 2011-02-18
Abstract
Abstract An improved telemetry system for telemetering digital data from an implantable tissue stimulator such as a heart pacemaker (11). A carrier signal is pulse modulated in accordance with either or both of stored digital data and a digitized electrocardiogram signal, for coupling onto an electrical lead (13, 15) connected directly to the heart (17). This arrangement facilitates the transmission of substantially higher data rates than previously could be achieved.
Inventors
- 👤 Sergiu Silvian
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:13
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/37211; A61N1/37252; A61N1/3727; Y; Y10; Y10S; Y10S128/00; Y10S128/903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
88 words
A living tissue stimulator apparatus comprising: implantable stimulator means for selectively producing electrical stimulus signals; an electrical lead (15) adapted to carry the stimulus signals from the stimulator means to the tissue (17); telemetry means mounted with implantable means for producing a telemetry signal and for transmitting it therefrom; and external receiver means (25) for receiving the telemetry signal transmitted by the telemetry means; wherein the telemetry means includes means for coupling the telemetry signal onto the electrical lead (15), for radiation outwardly to the receiver means (25).
Claim 2
Dependent Claim
78 words
A living tissue stimulator apparatus as defined in claim 1, wherein: the apparatus further includes a metallic case (43) for housing the implantable stimulator means and telemetry means, and a second electrical lead (13) adapted to carry the stimulus signals from the simulator means to the tissue (17) to be stimulated; and the telemetry means includes means for applying the telemetry signal between the two electrical leads (13, 15) and the case (43), to provide a dipole antenna.
Claim 3
Dependent Claim
60 words
A living tissue stimulator apparatus as defined in claim 1 or 2, wherein the telemetry means includes: digital means (59, 63) for providing a digital telemetry signal; and modulator means (27) for pulse-modulating a carrier signal with the digital telemetry signal, for coupling onto the electrical lead (15) or between the two electrical leads (13, 15) and the case (43).
Claim 4
Dependent Claim
71 words
A living tissue stimulator apparatus as defined in claim 3, wherein: the digital telemetry signal includes a succession of bits, each having either a first state or a second state; and the modulator means (27) includes means for providing a single burst of the carrier signal when a bit of the telemetry signal has the first state and an absence of the carrier signal when a bit has the second state.
Claim 5
Dependent Claim
64 words
A living tissue stimulator apparatus as defined in claim 4, wherein: the single burst of the carrier signal, provided by the modulator means (27) when a bit of the telemetry signal has the first state, has a duty cycle of less than about 0.2; and the carrier signal modulated by the telemetry means has a frequency in the range of 10 to 300 megahertz.
Claim 6
Dependent Claim
72 words
A living tissue stimulator apparatus as defined in one of the preceding claims, wherein: the apparatus is a pacemaker (11) adapted to stimulate muscle tissue of a heart (17); the apparatus further includes means for monitoring electrical signals generated by the heart (17) and for producing a corresponding analog electrocardiogram signal; and the telemetry means includes analog-to-digital converter means (59) for digitizing the analog electrocardiogram signal to produce a digitized electrocardiogram signal.
Claim 7
Dependent Claim
58 words
A living tissue stimulator apparatus as defined in claim 6, wherein the telemetry means further includes: memory means (67) for storing digital data; and multiplexing means (53, 71, 73) for multiplexing the digital data stored by the memory means (62) with the digitized electrocardiogram signal provided by the analog-to-digital converter means (59), to produce the digital telemetry signal.
References Cited (Backward Citations)
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