Medical lead system utilizing electromagnetic bandstop filters
First Claim
1. A medical lead, comprising:
- a) an implantable conductor having a proximal end and an at a distal end thereof, wherein the electrode is configured to be contactable with biological cells; and
b) at least one bandstop filter comprising a capacitance in parallel with an inductance electrically connected in series with the conductor,c) wherein the parallel capacitance and inductance provide the bandstop filter having a circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz.
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Abstract
Medical lead systems utilizing electromagnetic bandstop filters are provide which can be utilized in a magnetic resonance imaging (MRI) environment for patients who have implanted medical devices. The medical lead system includes an implanted lead having at least one bandstop filter associated therewith, for attenuating current flow through the lead over a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems.
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Citations
23 Claims
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1. A medical lead, comprising:
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a) an implantable conductor having a proximal end and an at a distal end thereof, wherein the electrode is configured to be contactable with biological cells; and b) at least one bandstop filter comprising a capacitance in parallel with an inductance electrically connected in series with the conductor, c) wherein the parallel capacitance and inductance provide the bandstop filter having a circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A medical lead, comprising:
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a) an implantable conductor having a proximal end and an electrode at a distal end thereof, wherein the electrode is configured to be contactable with biological cells; and b) at least one bandstop filter comprising a capacitance in parallel with an inductance electrically connected in series with the conductor, c) wherein the parallel capacitance and inductance provide the bandstop filter having a circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. - View Dependent Claims (19, 20)
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21. A medical lead, comprising:
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a) an implantable conductor having a proximal end and an electrode at a distal end thereof, wherein the electrode is configured to be contactable with biological cells; and b) at;
least one bandstop filter comprising a capacitance in parallel with an inductance electrically connected in series between a distal end of the conductor and a proximal end of a lead extension, andwherein the parallel capacitance and inductance provide the bandstop filter having a circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz, and d) wherein the lead extension has a length that is less than ¼
of an electrical wavelength of a center frequency to which the circuit Q is tuned. - View Dependent Claims (22, 23)
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Specification