A system for reducing noise in an implantable medical device

Details A system for reducing noise in an implantable medical device A system for reducing noise in an implantable medical device

A - Human Necessities

61

N

A61N 1/39 (2006.01) A61N 1/37 (2006.01) A61N 1/372 (2006.01)

Patent

CA 2459337

A system and method for reducing the amount of noise causes by inductive elements within an implantable medical device. In particular, the invention provides a system for gradually initiating and terminating the current flow within inductive elements such as transformers that are used to charge energy storage devices such as high-voltage capacitors of an implantable cardio/defibrillator. This more gradual change in the rate of current flow prevents ground shifts and subsequent noise spikes within the device. This, in turn, allows cardiac signals to be sensed more accurately by sensing circuits, preventing oversensing, and minimizing the occurrence of inappropriate shock delivery.

L'invention concerne un système et un procédé permettant de réduire la quantité de bruit provoquée par des éléments inducteurs dans un dispositif médical implantable. L'invention concerne notamment un système permettant de déclencher et d'arrêter progressivement un écoulement de courant dans des éléments inducteurs tels que des transformateurs utilisés pour charger des dispositifs de stockage d'énergie tels que les condensateurs haute tension d'un défibrillateur à synchronisation automatique/défibrillateur implantable. Une meilleure progressivité de l'écoulement de courant empêche les décalages de masse et les pics de bruit consécutifs dans le dispositif, ce qui permet de détecter plus précisément des signaux cardiaques à l'aide de circuits de détection, d'empêcher la surdétection, et de minimiser l'administration d'un choc inapproprié.

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