Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1996-07-02
1998-06-23
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 32, 128903, A61M 137
Patent
active
057698767
ABSTRACT:
An improved system is disclosed for telemetering data bidirectionally between two devices such as an implantable device and an external programmer. The two devices both include clock generators that operate at the same nominal frequency, but only one of the devices (i.e., the programmer) includes a phase-locked loop receiver that adjusts the frequency and phase of its clock signal to match that of the received data. The clock generator of the other device (i.e., the implantable device) generates a fixed-phase clock signal, which is selectively inverted or not inverted, to adjust its phase by 180.degree.. This selective 180.degree. adjustment enables the programmer's phase-locked loop receiver to have a reduced, .+-.90.degree. pull-in range, which simplifies its construction and reduces the time required to achieve synchronization.
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Kamm William E.
Pacesetter Inc.
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