Microstrip EMI shunt for an implantable medical device
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United States of America Patent
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-
Nov 4, 1997
Grant Date -
N/A
app pub date -
Dec 6, 1996
filing date -
Dec 6, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A microstrip EMI shunt for an implantable medical device (e.g., an ICD) which includes a microstrip transmission line secured to an interior surface of a housing of the device, the microstrip transmission line having a first end secured to a connector wire which is electrically coupled to internal electronics of the device, and a second end which is open-circuited. The microstrip transmission line has a length n.lambda./4, where .lambda. is the wavelength of EMI (in the microstrip medium) having a selected frequency f which is desired to be shunted, and n is an odd integer .gtoreq.1. In operation, EMI of the frequency f is shunted via the microstrip transmission line prior to reaching the internal electronics of the device. Additional microstrip transmission lines having appropriately chosen lengths to shunt EMI of different frequencies can also be provided.
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