MRI-safe implantable lead assembly
AssigneeLivaNova USA, Inc.
InventorsDavid L. Thompson, Jason F. Lindh
Life of this patent
Estimating the term…
Abstract
A medical device includes a pulse generator and a filter. The pulse generator is configured to generate a stimulation signal and to provide the stimulation signal to tissue of a patient via an implantable lead assembly. The filter is configured to couple to the implantable lead assembly. A combined impedance of the implantable lead assembly and the filter with respect to a current induced by an external electro-magnetic field satisfies an impedance threshold when the external electro-magnetic field has a first frequency and when the external electro-magnetic field has a second frequency. The combined impedance has a peak impedance value when the external electro-magnetic field has a third frequency that is between the first frequency and the second frequency.
Claims20
An implantable lead comprising:
- a conductor having a conductor length extending from a first end to a second end of the conductor;
- a sheath having a sheath length extending from a first end to a second end of the sheath, the sheath disposed over the conductor from the conductor first end to the conductor second end;
- and
- opposing first and second lead ends, the first lead end coupled to the first ends of the conductor and sheath and the second lead end coupled to the second ends of the conductor and sheath,
- wherein the conductor has a first portion at the first end of the conductor and a second portion at the second end of the conductor and an inductor-capacitor portion disposed between the first and second portions, the first and second portions having a single length of the conductor disposed within the sheath, the inductor-capacitor portion having at least three lengths of the conductor disposed proximate to each other to define an LC tank, the LC tank being tuned to resonate at a frequency of approximately 90-102 MHz when exposed to a first external magnetic field having a first frequency of 64 MHz and a second external magnetic field having a second frequency of 128 MHz, the LC tank being further tuned to provide approximately 1 kOhm of impedance when exposed to the first external magnetic field and the second external magnetic field.
An implantable lead comprising:
- a conductor having a conductor length extending from a first end to a second end of the conductor, the conductor further having a straight portion coupled to an inductor-capacitor portion, the straight portion having a straight length of the conductor, the inductor-capacitor portion having a coiled length of the conductor defining an internal core of the inductor-capacitor portion;
- and
- a core insert disposed at the internal core,
- wherein the inductor-capacitor portion and the core insert together define an LC tank, the LC tank being tuned to resonate at a frequency of approximately 90-102 MHz when exposed to a first external magnetic field having a frequency of 64 MHz and a second external magnetic field having a frequency of 128 MHz, the LC tank being further tuned to provide approximately 1 kOhm of impedance when exposed to the first external magnetic field and the second external magnetic field.
An implantable medical device comprising:
- a pulse generator having a port;
- and
- a lead coupled to the port, the lead comprising:
- a conductor having a conductor length extending from a first end to a second end of the conductor, the conductor further having a straight portion coupled to an inductor-capacitor portion, the straight portion having a straight length of the conductor, the inductor-capacitor portion having a coiled length of the conductor defining an internal core of the inductor-capacitor portion, and
- a core insert disposed at the internal core,
- wherein the inductor-capacitor portion and the core insert together define an LC tank, the LC tank being tuned to resonate at a frequency of approximately 90-102 MHz when exposed to a first external magnetic field having a frequency of 64 MHz and a second external magnetic field having a frequency of 128 MHz, the LC tank being further tuned to provide approximately 1 kOhm of impedance when exposed to the first external magnetic field and the second external magnetic field.
Dependencies are inferred from the claim text.