Composite RF current attenuator for a medical lead

US9071221B1 · kind B1 · utility

Assignee

• Greatbatch Ltd. · US

Inventors

• Robert A. Stevenson · Humphreys, US
• Robert Shawn Johnson · North Tonawanda, US
• Kishore Kumar Kondabatni · Williamsville, US
• Joseph Spaulding · Williamsville, US
• Dominick J. Frustaci · Williamsville, US
• Warren S. Dabney · Odenton, US
• Holly Noelle Moschiano · Williamsville, US

Key dates

• Filing date: Mar 26, 2015
• Grant date: Jun 30, 2015
• Expiry date: Mar 26, 2035

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H2007/013
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A composite RF current attenuator for a medical lead includes a conductor having a distal electrode contactable to biological cells, a bandstop filter in series with the lead conductor for attenuating RF currents flow through the lead conductor at a selected center frequency or across a range of frequencies about the center frequency, and a lowpass filter in series with the bandstop filter and forming a portion of the lead conductor. The bandstop filter has a capacitance in parallel with a first inductance. In a preferred form, the lowpass filter includes a second inductance in series with the bandstop filter, wherein the values of capacitance and inductances for the composite RF current attenuator are selected such that it attenuates MRI-induced RF current flow in an MRI environment.