# US 7,610,101 B2 · RF rejecting lead > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,610,101 B2 - Document ID: US7610101B2 - Status: Granted - Kind: B2 - Application number: 11/565,219 - Filed: 2006-11-30 - Published: 2008-06-05 - Granted: 2009-10-27 - Earliest claimed: 2006-11-30 - Assignees: Cardiac Pacemakers, Inc. - Inventors: Steven R. Wedan; Thomas W. Lloyd; Kevin J. Ely - Web page: https://patentgrep.com/patent/US7610101B2 ## CPC - A61N 1/05: for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence) - H03H 1/0007: {of radio frequency interference filters} - A61N 1/086: {Magnetic resonance imaging [MRI] compatible leads} - H03H 7/1766: {Parallel LC in series path (H03H7/1783 takes precedence)} - H03H 2001/0092: {Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) ## Abstract A lead assembly for an implantable medical device. The lead assembly comprises a lead body having a first portion and a second portion. The first portion is adapted for coupling to a pulse generator and the second portion is adapted for implantation in or near a heart. First and second co-radial conductive coils are positioned within the lead body and electrically isolated from each other. The first and second conductive coils include a first and second number of coil turns and the first number is substantially equivalent to the second number. A ring electrode is located at the second portion and a tip electrode is located distal to the ring electrode and coupled to the second conductive coil. The first conductive coil extends past the ring electrode and transitions to a non-coiled region, which extends back to and couples to the ring electrode. ## Claims ### Claim 1 A lead assembly for an implantable medical device, the lead assembly comprising: a lead body having a first portion and a second portion, the first portion adapted for coupling to a pulse generator and the second portion adapted for implantation in or near a heart; first and second co-radial conductive coils positioned within the lead body and electrically isolated from each other, wherein the first and second conductive coils include a first and second number of coil turns and the first number is substantially equivalent to the second number; a ring electrode located at the second portion; and a tip electrode located distal to the ring electrode and coupled to the second conductive coil; wherein the first conductive coil extends past the ring electrode to between the ring electrode and the tip electrode and transitions to a non-coiled region, which extends back to and couples to the ring electrode. ### Claim 2 (depends on 1) The lead assembly of claim 1 wherein the first conductive coil extends approximately halfway between the ring electrode and the tip electrode. ### Claim 3 (depends on 1) The lead assembly of claim 1 wherein the first conductive coil extends approximately one-quarter of the distance between the ring electrode and the tip electrode. ### Claim 4 (depends on 1) The lead assembly of claim 1 wherein the first conductive coil extends approximately three-quarters of the distance between the ring electrode and the tip electrode. ### Claim 5 (depends on 1) The lead assembly of claim 1 further comprising a first capacitor element connected in parallel with the first conductive coil and a second capacitor element connected in parallel with the second conductive coil. ### Claim 6 (depends on 1) The lead assembly of claim 1 further comprising a plurality of capacitor elements connected in parallel with the first conductive coil and a plurality of capacitor elements connected in parallel with the second conductive coil. ### Claim 7 (depends on 1) The lead assembly of claim 1 further comprising a capacitor element coupled between the first and second conductive coils. ### Claim 8 (depends on 1) The lead assembly of claim 1 further comprising a plurality of capacitor elements, each capacitor element coupled between the first and second conductive coils. ### Claim 9 (depends on 1) The lead assembly of claim 1 further comprising a first capacitor element connected in parallel with the first conductive coil, a second capacitor element connected in parallel with the second conductive coil, and a third capacitor coupled between the first and second conductive coils. ### Claim 10 (depends on 1) The lead assembly of claim 1 wherein the first and second conductive coils extend along a portion of the lead body. ### Claim 11 (depends on 1) The lead assembly of claim 1 wherein the lead body includes a lumen and the first and second conductive coils are located within the lumen. ### Claim 12 (depends on 1) The lead assembly of claim 1 wherein the first and second conductive coils are embedded within the lead body. ### Claim 13 A lead assembly for an implantable medical device, the lead assembly comprising: a lead body having a first portion and a second portion, the first portion adapted for coupling to a pulse generator and the second portion adapted for implantation in or near a heart; first and second electrodes located at the second portion, wherein the second electrode is distal to the first electrode; and a first means for blocking RF currents coupled to the first and second electrodes, wherein the first means for blocking RF currents includes first and second co-radial conductive coils positioned within the lead body, wherein the second conductive coil is coupled to the second electrode, and wherein the first conductive coil extends past the first electrode to between the first electrode and the second electrode and transitions to a non-coiled region, which extends back to and couples to the first electrode. ### Claim 14 (depends on 13) The lead assembly of claim 13 wherein the first and second conductive coils are parts of a unitary conductive member. ### Claim 15 (depends on 14) The lead assembly of claim 14 wherein the second conductive coil is coaxial with the first conductive coil. ### Claim 16 (depends on 13) The lead assembly of claim 13 further comprising third and fourth electrodes located at the second portion and a second means for blocking RF currents coupled to the third and fourth electrodes. ### Claim 17 A lead assembly for an implantable medical device, the lead assembly comprising: a lead body having a first portion and a second portion, the first portion adapted for coupling to a pulse generator and the second portion adapted for implantation in or near a heart; first and second co-radial conductive coils positioned within the lead body and electrically isolated from each other, wherein the first and second conductive coils include a first and second number of coil turns, the first and second number of coil turns include a number of matched turns and a number of unmatched turns, and the number of unmatched turns divided by the total number of unmatched and matched turns is less than approximately 1.5%; a first electrode located at the second portion and coupled to the first conductive coil; and a second electrode located at the second portion and coupled to the second conductive coil, wherein the first conductive coil extends past the first electrode to between the first electrode and the second electrode and transitions to a non-coiled region, which extends back to and couples to the first electrode. ### Claim 18 (depends on 17) The lead assembly of claim 17 wherein the number of unmatched turns divided by the total number of unmatched and matched turns is less than approximately 0.2%. ### Claim 19 (depends on 17) The lead assembly of claim 17 wherein the first and second conductive coils are offset on a one to one, two to two, three to three, two to three, three to two, or a four to four basis.