Method and apparatus for altering the Q of an implantable medical device telemetry antenna
US5766232A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1997 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/37223
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for programming implantable medical devices employing RF telemetry, and more particularly, altering the RF telemetry antenna Q to accommodate telemetry with implantable medical devices having differing RF telemetry receiving characteristics is disclosed. The RF head telemetry antenna comprises an LC tank circuit including an RF head telemetry coil and a tuning capacitor and has a predetermined antenna Q. The RF head telemetry antenna is adapted to be driven into oscillation by applied oscillating energy and to continue to oscillate in a series of declining amplitude oscillations after the oscillating energy is no longer applied as residually stored oscillating energy is dissipated therethrough. A transmit telemetry pulse is generated for establishing a pulse width of the telemetry RF pulse. Upon the termination of the telemetry transmit pulse antenna Q is reduced from the predetermined antenna Q, and the declining amplitude oscillations are thereby attenuated. The reduction of the antenna Q is effected by a grounding a sense coil located in the programmer RF head that is employed to sense the RF pulse and regulate the amplitude thereof during the transmit tel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.