Filtering device for recording electrophysiological signals

Inventors

Matthiesen, Mads Emil • Larsen, Sigge Nejst • Shadbolt, Victor • Wodlinger, Harold

Assignees

Cathvision ApS

Abstract

A switchable filter device for use in a system for recording electro-physiological signals. The filter device includes a plurality of recording channels, the recording channels having an ablation recording channel. Each recording channel has a patient side terminal at a patient interface and a corresponding recording side terminal at a recording device interface. Each recording channel includes a first signal path with a first frequency dependent transmission characteristic having a first pass band, a second signal path with a second frequency dependent transmission characteristic different from the first frequency dependent transmission characteristic, the second frequency dependent transmission characteristic having a second pass band overlapping the first pass band, and switching devices operable to switch between the first signal path and the second signal path in response to a control signal indicative of a transient interference signal. Preferably, switching from the second signal path to the first signal path is performed with a switching delay after termination of the transient interference signal.

Core Innovation

The invention relates to a switchable filter device for use in a system for recording intracardiac electrophysiological signals at intracardiac locations. The filter device includes a plurality of recording channels, each having a patient side terminal at a patient interface and a corresponding recording side terminal at a recording device interface. Each recording channel includes a first signal path with a first frequency dependent transmission characteristic and a first pass band, and a second signal path with a second frequency dependent transmission characteristic different from the first, with a second pass band overlapping the first pass band.

A detection device monitors for a transient interference signal and provides a control signal indicative of a status of the transient interference signal. Switching devices are operable to switch between the first signal path and the second signal path in response to the control signal. Switching from the second signal path to the first signal path is performed with a switching delay, defining a controlled transition after the interference status changes.

In the context of radiofrequency ablation, the transient interference signal is monitored in relation to a radiofrequency ablation signal, and the switching adapts to an interference-present status versus an interference-absent status. Switching into the more aggressive filtering path is performed within a constrained time window after the occurrence or starting of the interference, while switching back after termination is constrained by a switching delay. The transition to the less aggressive path can be performed in at least two stages, including an initial relaxation stage using a high pass filter referenced to common signal ground followed by a signal referenced stage using the high pass filter referenced to an unfiltered signal.

Claims Coverage

The independent claims are clm-00001 and clm-00015, covering both a switchable filter device and a corresponding method. Across the independent claims, the main inventive features are the detection-driven switching between overlapping pass bands with different frequency dependent transmission characteristics, and the use of a switching delay when returning from the second signal path to the first signal path after transient interference termination.

Together, the independent claims define a system and method in which transient interference is detected to drive switching between two different, overlapping pass-band frequency dependent transmission paths for intracardiac electrophysiological recording/filtering, and in which returning from the second path to the first path includes a switching delay after transient interference termination.

Stated Advantages

Documented Applications

No documented applications found