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AI Biotech/Diagnostics: Cardio
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Application US20190091479
Published 2019-03-28
Autonomous Cardiac Implant Of The Leadless Capsule Type With Energy Harvester And Controlled-charge Energy Storage Buffer
An energy harvester converts into electrical energy the external stresses applied to the implant at the heartbeat rhythm. This harvester comprises an inertial unit and a transducer delivering an electrical signal that is rectified and regulated for powering the implant and charging an energy storage component. The charge level of the energy storage component is compared with a lower threshold to detect an insufficient charge, and a dynamic charging control circuit modifies, as and whenever necessary, and if the current patient's state allows it, a stimulation parameter in a direction liable to increase in return the mean level of the mechanical energy that is produced and harvested.
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- 1. An autonomous cardiac implant of the leadless capsule type comprising an implant body provided with means for anchoring to a cardiac wall and comprising:
an electronic unit, with a stimulation circuit adapted to deliver stimulation pulses to an electrode of the implant, in a controlled manner, as a function of at least one stimulation parameter; an energy storage component for powering the electronic unit; a circuit for evaluating a charge level of the energy storage component; a comparator, for comparing said charge level with a predefined lower threshold, and delivering conditionally a low charge indicator as a function of the comparison result; and an energy harvesting module, adapted to convert into electrical energy external stresses applied to the implant body under the effect of movements of a wall to which the implant is anchored and/or of blood flow rate variations in the environment surrounding the implant at the heartbeat rhythm and/or of cardiac tissue vibrations the energy harvesting module comprising: an inertial unit subjected to said external stresses; a transducer adapted to convert the mechanical energy produced by the oscillations of the inertial unit into an electrical signal; and a power management circuit, adapted to rectify and regulate said electrical signal, to deliver as an output a stabilized direct voltage or current, for powering said electronic unit and/or charging said energy storage component, wherein the electronic unit further comprises: a dynamic charging control circuit, receiving as an input the low charge indicator and coupled at its output to the stimulation circuit, and adapted to modify said at least one stimulation parameter in a direction liable to increase the mean level of said mechanical energy produced by the inertial unit and converted by the transducer for powering said electronic unit and/or for charging said energy storage component.
