Patient telemetry device with auto-compensation for impedance changes in leadset antenna
First Claim
1. A telemetry system, comprising:
- a lead set comprising a plurality of electrocardiograph (ECG) leads connected to a lead set connector, the lead set providing an antenna formed from conductive material within at least one of the plurality ECG leads; and
a telemetry unit which connects to the lead set and uses the antenna to transmit physiologic data sensed using the lead set, the telemetry unit including an impedance detector that monitors an impedance of the antenna, and further including a dynamic impedance matching circuit coupled to the antenna, the dynamic impedance matching circuit being responsive to impedance changes detected by the impedance detector to compensate for said impedance changes.
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Accused Products
Abstract
Various designs and features of an ambulatory transceiver and ECG lead set are disclosed for use in remote patient monitoring. One feature involves the use of unshielded, dual-conductor lead wires in which one conductor carries the patient'"'"'s ECG signal and the other conductor provides an RF antenna element for the transceiver. The lead wires used in one embodiment provide improved flexibility, durability, and antenna performance over conventional lead sets with shielded wires. Another feature involves an antenna diversity scheme in which the transceiver switches between two or more ECG-lead antennas, each of which is formed from one or more ECG leads of the lead set. Another feature involves the use of a circuit within the transceiver to monitor, and dynamically compensate for changes in, the impedance of an ECG-lead antenna or a conductor thereof. Another feature is an improved circuit for protecting the transceiver from damage caused by defibrillation pulses.
128 Citations
30 Claims
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1. A telemetry system, comprising:
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a lead set comprising a plurality of electrocardiograph (ECG) leads connected to a lead set connector, the lead set providing an antenna formed from conductive material within at least one of the plurality ECG leads; and
a telemetry unit which connects to the lead set and uses the antenna to transmit physiologic data sensed using the lead set, the telemetry unit including an impedance detector that monitors an impedance of the antenna, and further including a dynamic impedance matching circuit coupled to the antenna, the dynamic impedance matching circuit being responsive to impedance changes detected by the impedance detector to compensate for said impedance changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30)
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12. A telemetry system, comprising:
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a lead set comprising a plurality of leads that attach to a patient to monitor physiologic data of the patient, the lead set providing an antenna formed from conductive material within at least one of the plurality ECG leads; and
a telemetry unit which receives the physiologic data from the lead set and transmits the physiologic data from the antenna, the telemetry unit including a circuit that monitors an impedance of the antenna, and adjusts a dynamic impedance matching circuit coupled to the antenna to correct for impedance mismatches.
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27. A method of conveying physiologic data of a patient to a remote location for monitoring, comprising:
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sensing physiologic data of the patient with a lead set that attaches to the patient;
transmitting the physiologic data from an antenna which comprises at least one conductor that extents within a lead of the lead set; and
automatically adjusting a dynamic impedance matching circuit coupled to the antenna to compensate for changes in the impedance of the antenna.
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Specification