RF filter for an active medical device (AMD) for handling high RF power induced in an associated implanted lead from an external RF field
US9757558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2015 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Apr 16, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H1/0007
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An AIMD includes a conductive housing, an electrically conductive ferrule with an insulator hermetically sealing the ferrule opening. A conductive pathway is hermetically sealed and disposed through the insulator. A filter capacitor is disposed within the housing and has a dielectric body supporting at least two active and two ground electrode plates interleaved, wherein the at least two active electrode plates are electrically connected to the conductive pathway on the device side, and the at least two ground electrode plates are electrically coupled to either the ferrule and/or the conductive housing. The dielectric body has a dielectric constant less than 1000 and a capacitance of between 10 and 20,000 picofarads. The filter capacitor is configured for EMI filtering of MRI high RF pulsed power by a low ESR, wherein the ESR of the filter capacitor at an MRI RF pulsed frequency or range of frequencies is less than 2.0 ohms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.