Movement powered medical pulse generator having a full-wave...

A - Human Necessities – 61 – N

Patent

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Details

A61N 1/378 (2006.01) G04C 10/00 (2006.01) H02M 7/219 (2006.01) H03K 12/00 (2006.01)

Patent

CA 2204879

The present invention concerns pulse generators which are powered through movement. Such devices include both implantable medical devices, such as cardiac pacemakers, as well as timepieces such as wristwatches. The present invention particularly concerns a pulse generator which features a full-wave rectifier circuit which has dynamic bias. The full-wave rectifier circuit is implemented using four field-effect transistors (FETs) operable to selectively establish the paths between first and second input terminals and first and second output terminals thereof. Alternating pairs of the diode/FETs are rendered conductive during positive and negative excursions of the input signal to be rectified. Two differential sense amplifiers are associated with two respective ones of the diode/FETs. A dynamic bias circuit is responsive to both positive and negative excursions of the input signal to provide bias current to at least one of the differential sense amplifiers, such that the predetermined threshold amount is substantially less than the threshold of conventional diodes.

La présente invention concerne des générateurs pleine onde qui sont actionnés par un mouvement d'horlogerie. Ces dispostifs sont à la fois des dispositifs médicaux implantables, tels que des stimulateurs cardiaques, ainsi que des mécanismes d'horlogerie tels que des montres-bracelets. La présente invention concerne notamment un générateur d'impulsions qui comprend un circuit redresseur pleine onde à polarisation dynamique. Ce circuit redresseur pleine onde est réalisé au moyen de quatre transistors à effet de champ (TEC) prêts à être mis en marche pour établir sélectivement les voies entre des première et seconde bornes d'entrée et des première et seconde bornes de sortie. Des paires alternées de diodes/TEC deviennent conductrices au cours d'excursions positives et négatives du signal d'entrée à rectifier. Deux amplificateurs de détection différentiels sont associés aux deux amplificateurs respectifs des diodes/TEC. Un circuit de polarisation dynamique est sensible à la fois aux excursions positives et négatives du signal d'entrée afin de générer un courant de polarisation à au moins un des amplificateurs de détection différentiels de sorte que le seuil prédéterminé soit pratiquement inférieur au seuil des diodes conventionnelles.

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