Implantable medical device

摘要

An implantable medical device includes an integrated or connectable implantable three-dimensional acceleration sensor, and a ballistocardiogram (BCG) capturing unit that is connected or connectable to the acceleration sensor. The BCG evaluation unit processes an acceleration signal provided by the acceleration sensor and derives a BCG from the 3D accelerometer output signal. A BCG evaluation unit is connected to the BCG capturing unit, and is designed to evaluate a BCG provided by the BCG capturing unit and supply an output signal representing stroke volume.

主权项

1. An implantable medical device including:
a. an acceleration sensor; b. a pressure sensor; c. a BCG capturing unit configured to:
(1) receive an acceleration signal from the acceleration sensor, and(2) derive a ballistocardiogram from the acceleration signal; and d. a BCG evaluation unit configured to supply:
(1) an output signal representing a stroke volume, the output signal being dependent on the ballistocardiogram, and(2) an output signal representing a contractility measure for a left ventricle from the ballistocardiogram, wherein the contractility measure is derived from the rise of a J-wave from the ballistocardiogram; and e. an evaluation unit configured to determine temporal synchronization of:
(1) the pressure signal, and(2) blood ejection indicated by the ballistocardiogram.