Tank filters adaptable for placement with a guide wire, in series with the lead wires or circuits of active medical devices to enhance MRI compatibility
US7702387B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2007 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Dec 25, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/1783
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A tank filter is provided for a lead wire of an active medical device (AMD). The tank filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the tank filter is resonant at a selected frequency. A passageway through the tank filter permits selective slidable passage of a guide wire therethrough for locating the lead wire in an implantable position. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the tank filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the tank filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.