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Microstrip EMI shunt for an implantable medical device

  • US 5,683,434 A
  • Filed: 12/06/1996
  • Issued: 11/04/1997
  • Est. Priority Date: 12/06/1996
  • Status: Expired due to Term
First Claim
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1. A microstrip EMI shunt device for an implantable medical device which includes a housing, internal electronics contained within the housing, and a connector wire, the microstrip EMI shunt comprising:

  • a microstrip transmission line positioned in the housing, said microstrip transmission line having a first end electrically coupled to the connector wire and a second end which is open-circuited, wherein said connector wire is electrically coupled to said internal electronics;

    wherein said microstrip transmission line has a length which is nλ

    /4, where λ

    represents the wavelength of EMI having a selected frequency f, and n is an odd integer >

    1; and

    ,wherein said microstrip transmission line presents a low impedance to EMI having the frequency f, so that EMI of the selected frequency f is shunted prior to reaching the internal electronics of the implantable medical device.

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