MRI RF rejection module for implantable lead
AssigneePacesetter, Inc.
InventorJohn W. Poore
Life of this patent
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Abstract
A high Q self-resonant inductor and method for manufacturing the same is disclosed herein for use in an implantable medical lead. The method of manufacture includes depositing a first conductive material over an elongated ceramic member and removing portions of the conductive material to leave a continuous helical metallic pattern on an elongated ceramic structure. The helical metallic pattern has a first terminal end located at a proximal end of the elongated ceramic member and a second terminal end located at a distal end of the ceramic member. The method also includes covering the helical metallic pattern with a ceramic material to form a first ceramic layer and forming vias in the ceramic material. At least one electrode is coupled to the helical metallic pattern through the vias in the ceramic material.
Claims14
An implantable medical lead comprising:
- a resonant filter comprising an inductor having a parasitic capacitance, the inductor and parasitic capacitance forming a parallel resonant LC filter, the inductor having a first layer comprising:
- a first helical metallic member located on an elongated member, the first helical metallic member comprising a first terminal end located near a proximal end of the elongated member and a second terminal end located near a distal end of the elongated member;
- and a dielectric ceramic material coaxially covering the elongated member and the first helical metallic member, wherein the dielectric material between turns of the helical metallic member forms the parasitic capacitance and wherein the dielectric ceramic material encapsulates the first helical metallic member and includes first and second apertures located over the first and second terminal ends, respectively, of the first metallic helical member such that the terminal ends are accessible through the apertures;
- and
- a lead body including a lead connector end on a proximal end of the lead body and an electrode on a distal end of the lead body, the lead connector end including an electrical contact, the self resonant inductor supported on the lead body, the first terminal being in electrical communication with the electrical contact of the lead connector end via a first electrical pathway extending through the first aperture, the second terminal being in electrical communication with the electrode via a second electrical pathway extending through the second aperture.
An implantable medical lead comprising:
- a body including a distal portion with an electrode and a proximal portion with a lead connector end;
- and
- an electrical pathway extending between the electrode and lead connector end, the electrical pathway including an inductor having a parasitic capacitance, the inductor and parasitic capacitance forming a parallel resonant LC filter, wherein the self resonant inductor comprises one or more layers comprising a helical metallic pattern on a dielectric ceramic material and a ceramic layer coaxially covering the helical metallic pattern wherein the dielectric material between turns of the helical metallic member forms the parasitic capacitance.
Dependencies are inferred from the claim text.