MULTI-VECTOR SENSING IN CARDIAC DEVICES WITH DETECTION COMBINATIONS

摘要

Methods and devices for combining multiple signals from multiple sensing vectors for use in wearable or implantable cardiac devices. Signals from multiple vectors may be combined using weighting factors and/or by conversion to different coordinate systems than the original inputs, which may or may not be normalized to patient anatomy. Signals from multiple sensing vectors may be combined prior to or after several analytical steps or processes including before or after filtering, and before or after cardiac cycle detection. Cardiac cycle detection information may be combined across multiple sensing vectors before or after analysis of individual vectors for noise or overdetection. Cardiac cycle detection information may also be combined across multiple sensing vectors to identify noise and/or overdetection.

主权项

1. A cardiac rhythm management device comprising at least first, second and third input electrical nodes to define at least first and second sensing vectors, and operational circuitry for analyzing cardiac signals on at least three data streams as follows:
a first data stream for a signal on the first sensing vector; a second data stream for a signal on the second sensing vector; and a third data stream for a signal calculated as a combined signal generated by combining signals from at least the first and second sensing vectors; wherein the operational circuitry is configured to perform the following: identify a potential new cardiac cycle by analysis of at least the third data stream; determine whether there is noise on any of the first, second and third data streams and, if so, do one of the following: if noise is present on all three data streams, discard data associated with the potential new cardiac cycle; or if noise is present on less than all three data streams, change the manner in which the first and second data streams are combined together.