Low current telemetry system for cardiac pacers
First Claim
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1. Apparatus for telemetering the condition of a component in a cardiac pacer implanted in a patient, which pacer provides stimulating pulses to the heart of the patient, comprising:
- voltage means in said pacer for producing a voltage output signal indicative of the condition of a component of said pacer;
a ground;
pulse producing means in said pacer for receiving said voltage output signal and producing an output train of electrical pulses independent of said stimulating pulses, said pulse producing means comprising a complementary astable multivibrator comprising;
a first transistor; and
a second transistor of opposite conductivity type from said first transistor and having its emitter directly connected to said ground;
means in said pacer for modulating said output train of electrical pulses in accordance with the magnitude of said voltage output signal, said modulating means comprising;
a resistor inserted between the collector of said first transistor and the base of said second transistor; and
a diode inserted between the base of said second transistor and said ground with its anode directly connected to said ground;
means in said pacer for electrically transmitting said modulated output train of electrical pulses out of said pacer and said patient; and
means external to said patient for receiving said electrically transmitted output train of electrical pulses.
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Abstract
A system for telemetering the performance of an implanted cardiac pacer incorporating a low power, low voltage, frequency-voltage sensitive pulse generator which supplies a pulse-interval-modulated telemetry output and includes an astable complementary multivibrator in combination with a voltage clipping feedback network.
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Citations
9 Claims
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1. Apparatus for telemetering the condition of a component in a cardiac pacer implanted in a patient, which pacer provides stimulating pulses to the heart of the patient, comprising:
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voltage means in said pacer for producing a voltage output signal indicative of the condition of a component of said pacer; a ground; pulse producing means in said pacer for receiving said voltage output signal and producing an output train of electrical pulses independent of said stimulating pulses, said pulse producing means comprising a complementary astable multivibrator comprising; a first transistor; and a second transistor of opposite conductivity type from said first transistor and having its emitter directly connected to said ground; means in said pacer for modulating said output train of electrical pulses in accordance with the magnitude of said voltage output signal, said modulating means comprising; a resistor inserted between the collector of said first transistor and the base of said second transistor; and a diode inserted between the base of said second transistor and said ground with its anode directly connected to said ground; means in said pacer for electrically transmitting said modulated output train of electrical pulses out of said pacer and said patient; and means external to said patient for receiving said electrically transmitted output train of electrical pulses. - View Dependent Claims (2, 3, 4)
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5. Apparatus for providing a continuous train of electrical output pulses whose timing is sensitive to variations in input voltages comprising:
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a ground; a first transistor; a second transistor of opposite conductivity type from said first transistor and having its emitter grounded; first means for connecting the base of said first transistor to the collector of said second transistor; second means for connecting the emitter of said first transistor to the base of said second transistor; third means for connecting the emitter of said first transistor to a source of input voltage; fourth means for connecting the emitter of said first transistor to ground; fifth means for connecting the collector of said first transistor to ground; sixth means for connecting the base of said second transistor to said fifth means; seventh means connected to the collector of said first transistor for conducting said electrical output pulses; and wherein said first, second, third, fifth, sixth and seventh means each comprise a resistor, said fourth means comprises a condenser and said sixth means further comprises a condenser, and said fifth and seventh means each further comprise a diode, the former of which has its anode grounded and the latter of which has its cathode connected directly to the collector of said first transistor. - View Dependent Claims (6)
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7. A telemetry pulse generator system for use in cardiac pacers, which generator system is pulse interval modulated by variations in input voltage comprising:
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power cell means having a first pole and a second pole with a voltage difference between them for supplying an input voltage; a first transistor; a first resistor inserted between the emitter of said first transistor and the first pole of said power cell for connecting said first transistor to said input voltage; a first condenser inserted between the emitter of said first transistor and the second pole of said power cell; a second transistor of a conductivity type opposite to that of said first transistor and having its emitter connected directly to said second pole; a second resistor inserted between the base of said first transistor and the collector of said second transistor; a third resistor inserted between the base of said second transistor and the emitter of said first transistor; a fourth resistor inserted between the collector of said first transistor and said second pole; a fifth resistor and a diode connected in series between the collector of said first transistor and said second pole with the anode of said diode connected directly to said second pole; a second condenser inserted between the base of said second transistor and the junction between said fifth resistor and said diode; and means connected to the collector of said first transistor for conducting interval modulated output pulses. - View Dependent Claims (8, 9)
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Specification