Implantable lead bandstop filter employing an inductive coil with parasitic capacitance to enhance MRI compatibility of active medical devices

US8145324B1 · kind B1 · utility

Assignee

• Greatbatch Ltd. · US

Inventors

• Robert A. Stevenson · Humphreys, US
• Henry R. Halperin · Baltimore, US
• Albert C. Lardo · Baldwin, US
• Warren S. Dabney · Odenton, US
• Kishore Kumar Kondabatni · Williamsville, US
• Christine A. Frysz · Orchard Park, US
• Robert Shawn Johnson · North Tonawanda, US
• Holly Noelle Moschiano · Williamsville, US

Key dates

• Filing date: Oct 18, 2011
• Grant date: Mar 27, 2012
• Expiry date: Oct 18, 2031

Classification

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

Abstract

A medical lead system includes at least one bandstop filter for attenuating current flow through the lead across 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 or range of frequencies. 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.