Implantable telemetry transmission system for analog and digital data
First Claim
Patent Images
1. In a telemetry system for transmitting data from at least one location within a living body to an external receiver, a transmitter comprising:
- input means for receiving a signal from said location and providing an electrical signal representative of said data;
modulator means for receiving said electrical signal and generating an alternating signal having a frequency which differs from a predetermined nominal frequency by an amount determined by some characteristic of said electrical signal;
antenna means;
current source means;
capacitance means; and
switching means controlled by the alternating signal from said modulator means to connect said capacitance means to said current source means during half of the period of said alternating signal from said modulator means, and to connect said capacitance means to said antenna means during the other half of said alternating signal.
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Abstract
An improved telemetry transmission system for transmitting electrocardiographic information, indications of the occurrence of the pacing pulse and for transmitting digitally encoded information from an implanted pacemaker, an implanted drug dispensing device, or other implanted device, to a remote receiver. Digital data transmitted by the implanted system may include all programmed parameters as well as power source status and self test indications, or other programmed digital data such as the device serial number and lot number.
235 Citations
7 Claims
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1. In a telemetry system for transmitting data from at least one location within a living body to an external receiver, a transmitter comprising:
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input means for receiving a signal from said location and providing an electrical signal representative of said data; modulator means for receiving said electrical signal and generating an alternating signal having a frequency which differs from a predetermined nominal frequency by an amount determined by some characteristic of said electrical signal; antenna means; current source means; capacitance means; and switching means controlled by the alternating signal from said modulator means to connect said capacitance means to said current source means during half of the period of said alternating signal from said modulator means, and to connect said capacitance means to said antenna means during the other half of said alternating signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A telemetry system for transmitting data from at least one location within a living body to an external receiver, a transmitter comprising:
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input means for receiving a signal from said location and providing an electrical signal representative of said data; modulator means for receiving said electrical signal and generating an alternating signal having a frequency which differs from a predetermined nominal frequency by an amount determined by some characteristic of said electrical signal; transmitting antenna means; current source means; capacitance means; and switching means controlled by the alternating signal from said modulator means to connect said capacitance means to said current source means during half of the period of said alternating signal from said modulator means, and to connect said capacitance means to said transmitting antenna means during the other half of said alternating signal, said transmitting antenna means radiating a signal during said other half of said alternating signal; a receiver comprising; receiving antenna means adapted to receive a signal radiated by said transmitting antenna means; band pass filter means connected to said receiving antenna means to receive a signal from said receiving antenna and said filter delivering an output signal representative of received signals within the pass band; and a phase lock loop circuit connected to said band pass filter to receive the output therefrom and said circuit producing a demodulated analog output signal representative of said data.
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Specification