Improved system and method for determining tissue contact of...

A - Human Necessities – 61 – N

Patent

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A61N 1/05 (2006.01) A61B 5/05 (2006.01)

Patent

CA 2423167

An improved system for monitoring the status of an IMD such as medical electrical lead during an implant procedure is provided. The system includes a signal generator for supplying a first signal such as a constant current or voltage to the IMD. A resulting voltage or current signal is generated, respectively, and may be sensed as an indication of the impedance of a portion of the body that is proximal to one or more electrodes carried by the lead. This impedance indication is converted to an audible signal having a frequency that is proportional to the amplitude of the impedance indication. The pitch of the audible signal therefore rises when measured impedance increases, and drops as the impedance decreases. These pitch changes allow a user to determine positional information associated with the IMD, including the degree of lead tissue contact and extent of fixation of a device to tissue.

L'invention concerne un système amélioré de surveillance de l'état d'un dispositif médical implantable, tel qu'un conducteur électrique médical, pendant une procédure d'implantation. Ce système comprend un générateur de signaux, conçu pour fournir au dispositif médical implantable, un premier signal, tel qu'une tension ou un courant constant. Ce signal de tension ou de courant est produit et il peut être détecté en tant qu'indication de l'impédance d'une portion du corps située à proximité d'une ou plusieurs électrodes portées par le conducteur. Cette indication d'impédance est convertie en un signal audible possédant une fréquence proportionnelle à l'amplitude de l'indication d'impédance. La hauteur tonale du signal audible s'élève donc lorsque l'impédance mesurée augmente, et elle chute lorsque l'impédance décroît. Ces changements de hauteur tonale permettent à un utilisateur de déterminer une information de position associée au dispositif médical implantable, notamment le degré de contact entre les tissus et le conducteur et l'étendue de la fixation d'un dispositif sur un tissu.

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