Medical lead system utilizing electromagnetic bandstop filters
First Claim
1. A medical lead system, comprising:
- a.)an implantable lead comprising at least one electrical conductor having a first length extending to a proximal lead end and a distal lead end;
b.)an electrode located at the distal lead end, the electrode being contactable with biological cells; and
c.)at least one bandstop filter comprising a capacitor in parallel with an inductor, the parallel capacitor and inductor being in series with the electrical conductor, wherein the bandstop filter has a 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.
18 Citations
21 Claims
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1. A medical lead system, comprising:
- a.)
an implantable lead comprising at least one electrical conductor having a first length extending to a proximal lead end and a distal lead end;
b.)an electrode located at the distal lead end, the electrode being contactable with biological cells; and
c.)at least one bandstop filter comprising a capacitor in parallel with an inductor, the parallel capacitor and inductor being in series with the electrical conductor, wherein the bandstop filter has a 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, 18, 19, 20, 21)
- a.)
Specification