Pacemaker system with automatic event-programmed switching between unipolar and bipolar operation
Patent 4549548 Issued on October 29, 1985. Estimated Expiration Date: 
September 14, 2003. 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.
September 14, 2003. 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 3825015 3920024 3-(3,4-Dihydroxyphenyl)-N-(4-nitrobenzyl)alanine hydrobromide Pacer output circuit Implantable externally programmable microprocessor-controlled tissue stimulator Patent #: 4424812 InventorsAssigneeApplicationNo. 06/532184 filed on 09/14/1983US Classes:607/27, Testing or monitoring pacer function607/25, Ventricular electrocardiographic intervals (e.g., Q-T interval)607/36, Feature of stimulator housing or encapsulation607/38Multiple position connectorExaminersPrimary: Kamm, William E.Attorney, Agent or FirmInternational ClassesA61N 1/372 (20060101)A61N 1/368 (20060101) AbstractA pacemaker system incorporates an implantable pacemaker and a plurality of electrodes, electrodes preferably being on a pacing lead for a single chamber pacemaker, or a pair of such leads for a dual chamber pacemaker. Programmable connection means are provided for connecting the pacemaker output to a selected combination of lead electrodes, the selection being changed during each pacer cycle to optimize the choice of unipolar and bipolar operation for given pacemaker events. In one mode, the system employs bipolar QRS sensing and unipolar pacing and T-wave sensing. In another mode, the system employs bipolar QRS sensing and pacing, and unipolar T-wave sensing.Other References
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