US 7,734,354 Bl Jun. 8, 2010
(54) STIMULATION LEAD, STIMULATION
SYSTEM, AND METHOD FOR LIMITING
MRI INDUCED CURRENT IN A
(75) Inventor: Timothy J Cox, Leonard, TX (US)
(73) Assignee: Advanced Neuromodulation Systems, Inc., Piano, TX (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 481 days.
(21) Appl.No.: 11/833,801
(22) Filed: Aug. 3, 2007
Related U.S. Application Data
(60) Provisional application No. 60/821,419, filed on Aug. 4, 2006.
(51) Int. CI.
(52) U.S. CI 607/116
(58) Field of Classification Search 607/116
See application file for complete search history.
In one embodiment, an implantable lead for electrical stimulation of a patient, comprises: a bidirection frequency dependent current limiter (BFDCL) circuit that limits a magnitude of current that can flow through the at least one conductor from the at least one terminal to the at least one electrode, wherein the BFDCL circuit comprises: a passive frequency dependent network element; first and second semiconductors that each comprise source, drain, and reference terminals, wherein the source terminals of the first and second semiconductors are coupled to respective ends of the passive frequency dependent network element, the source terminal of the first semiconductor is coupled to the gate terminal of the second semiconductor, and the source terminal of the second semiconductor is coupled to the gate terminal of the first semiconductor.
18 Claims, 3 Drawing Sheets