Cylindrical bandstop filters for medical lead systems
First Claim
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1. A medical lead bandstop filter for attenuating current flow through a lead wire at a selected frequency, comprising:
- a tubular capacitor having a first electrode and a second electrode; and
a generally cylindrical inductor attached in series at an end of the capacitor, the inductor including a winding having a first end conductively coupled to the first electrode and a second end conductively coupled to the second electrode so as to place the capacitor and the inductor electrically in parallel with one another, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at the selected frequency.
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Abstract
A one-piece cylindrical bandstop filter for medical lead systems incorporates parallel capacitive and inductive elements in a compact cylindrical configuration. The compact cylindrical configuration of the bandstop filter does not add significantly to the size or weight of the medical lead system. Preferably, the bandstop filters are of biocompatible materials or hermetically sealed in biocompatible containers. The parallel capacitive and inductive elements are placed in series with the medical lead system, and are selected so as to resonate at one or more selected frequencies, typically MRI pulsed frequencies.
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Citations
42 Claims
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1. A medical lead bandstop filter for attenuating current flow through a lead wire at a selected frequency, comprising:
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a tubular capacitor having a first electrode and a second electrode; and a generally cylindrical inductor attached in series at an end of the capacitor, the inductor including a winding having a first end conductively coupled to the first electrode and a second end conductively coupled to the second electrode so as to place the capacitor and the inductor electrically in parallel with one another, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at the selected frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A medical lead bandstop filter for attenuating current flow through a lead wire at a selected frequency, comprising:
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a generally cylindrical dielectric body; and a conductive winding associated with the body, the conductive winding and the body cooperatively forming an inductor; wherein turns of the conductive winding form a parasitic capacitor in parallel with the inductor, and wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at the selected frequency. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A medical lead bandstop filter for attenuating current flow through a lead wire at a selected frequency, comprising:
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a tubular capacitor having a first electrode and a second electrode; and a conductive winding wound around the capacitor and forming an inductor, a first end of the winding being conductively coupled to the first electrode and a second end of the winding being conductively coupled to the second electrode so as to place the capacitor and the inductor in parallel with one another, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at the selected frequency. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification