Closed-loop downlink telemetry and method for implantable medical device
Patent 5324315 Issued on June 28, 1994. Estimated Expiration Date: 
August 12, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 12, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3311111 3426748 3518997 3623486 3631860 3738369 3805796 Electrocardiograph telemetry system including method and means for indicating inoperative conditions Programmable body stimulator Pacing generator programming apparatus including error detecting means InventorAssigneeApplicationNo. 106495 filed on 08/12/1993US Classes:607/60, Telemetry or communications circuits128/903, RADIO TELEMETRY607/32Communicating with pacer (e.g., telemetry)ExaminersPrimary: Kamm, William E.Attorney, Agent or FirmInternational ClassA61N 001/362AbstractA closed loop system for attaining premium telemetry performance for vector field electromagnetically coupled telemetry systems. The disclosed system utilizes a linear ramped envelope for downlink RF bursts, resulting in a detected pulse width in the implanted device which is proportional to the downlink detection margin. The detected pulse width, when uplink telemetered to an external programming unit allows the programming unit to generate a telemetry status feedback signal for the user positioning the programming head with respect to the implant site. Feedback based upon both uplink and downlink signal strength in especially advantageous in dual-coil systems where there are distinct and unique coupling coefficients for uplink and downlink.Other References
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