System and method for detecting sheathing and unsheathing of localization elements

摘要

A method of detecting whether a localization element is within or outside of an introducer sheath generally includes obtaining a localization signal from the localization element and detecting the state of the localization element relative to the sheath based upon the quadrature component of the localization signal. A baseline quadrature component is typically established with the localization element outside of the sheath. When the quadrature component deviates from this baseline value, it is indicative of the localization element being within the sheath. Conversely, when the quadrature component remains relatively close to the baseline value, it is indicative of the localization element being outside of the sheath. In an electrophysiology study, the state information can be used to take corrective action with respect to the data being collected.

主权项

1. A method of detecting a localization element/sheath state change with a localization system, comprising:
establishing a localization field using a plurality of localization field generators; obtaining at least one localization signal from at least one catheter-borne localization element positioned within the localization field via an introducer sheath, the at least one localization signal including an in-phase component and a quadrature component; and detecting a localization element/sheath state change for the at least one catheter-borne localization element based on the quadrature component of the at least one localization signal, wherein detecting the localization element/sheath state change comprises detecting withdrawal of the at least one localization element into the introducer sheath based upon the quadrature component of the at least one localization signal deviating from a reference value by more than a preset amount.