Microstrip EMI shunt for an implantable medical device
First Claim
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.
2 Assignments
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Accused Products
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 nλ/4, where λ 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 ≧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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Citations
17 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification