# US 2012/0083864 A1 · Medical lead system utilizing electromagnetic bandstop filters

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2012/0083864 A1
- Document ID: US20120083864A1
- Status: Published application
- Kind: A1
- Application number: 13/299,278
- Filed: 2011-11-17
- Published: 2012-04-05
- Earliest claimed: 2001-04-13
- Assignees: Greatbatch Ltd.
- Inventors: Randy Westlund; Robert A. Stevenson; Christine A. Frysz; Warren S. Dabney
- Web page: https://patentgrep.com/patent/US20120083864A1

## CPC

- A61N 1/05: for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence)
- A61N 1/0556: {Cuff electrodes}
- H03H 1/0007: {of radio frequency interference filters}
- H03H 7/0115: {comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence)}
- A61N 1/0534: {Electrodes for deep brain stimulation}
- A61N 1/0539: {Anchoring of brain electrode systems, e.g. within burr hole}
- A61N 1/0587: {Epicardial electrode systems; Endocardial electrodes piercing the pericardium}
- A61N 1/086: {Magnetic resonance imaging [MRI] compatible leads}
- A61N 2001/0585: {Coronary sinus electrodes}
- H03H 7/1766: {Parallel LC in series path (H03H7/1783 takes precedence)}
- H03H 2001/0085: {Multilayer, e.g. LTCC, HTCC, green sheets}
- H03H 2007/013: {Notch or bandstop filters}
- 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

Medical lead systems utilizing electromagnetic bandstop filters are provide which can be utilized in a magnetic resonance imaging (MRI) environment for patients who have implanted medical devices. The medical lead system includes an implanted lead having at least one bandstop filter associated therewith, for attenuating current flow through the lead over a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems.

## Claims

### Claim 1

A medical lead system, comprising:
a conductor lead having a proximal end, and an electrode in contact with biological cells at a distal end; and
at least one bandstop filter associated with the conductor, for attenuating current flow through the lead over a range of frequencies, the bandstop filter having an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 KHz, and wherein the bandstop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the conductor wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at a selected center frequency.