Application US20190151666

AUTONOMOUS CARDIAC IMPLANT OF THE "LEADLESS CAPSULE" TYPE, WITH DETECTION OF ATRIAL ACTIVITY BY ANALYSIS OF THE CHARGING ELECTRIC SIGNAL DELIVERED BY AN ENERGY HARVESTING MODULE
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US20190151666

1. An autonomous cardiac implant of the leadless capsule type, comprising an implant body provided with means for anchoring to a cardiac wall, the implant body accommodating an electronic unit and an energy harvesting module with an energy storage component for powering the electronic unit, the energy harvesting module being 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 variations in the environment surrounding the implant at the heartbeat rhythm and/or of cardiac tissue vibrations, wherein the energy harvesting module comprises: (4) (3)

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 oscillating electrical signal; and

a power management circuit, adapted to rectify and regulate said oscillating 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, and wherein the implant further comprises atrial detection means, adapted to analyze, between successive beats, the oscillating electrical signal to derive therefrom atrial activity information likely to prove in said heartbeats the presence of an atrial event and/or to characterize the instant of occurrence thereof.

2. The implant of claim 1, wherein the atrial activity information is information about the presence/absence of an atrial contraction. (0)

3. The implant of claim 1, further comprising: (1) (3)

ventricular detection means, adapted to deliver a ventricular time marker defining an instant of occurrence of a ventricular event of a cardiac beat, and

means for defining a detection window, preceding or following the ventricular time marker, and

wherein the atrial detection means are means adapted to analyze the variations of the oscillating electrical signal by searching for an atrial activity component within the detection window.

4. The implant of claim 3, wherein the ventricular detection means are means adapted to derive the ventricular time marker by analyzing the variations of the oscillating electrical signal delivered by the transducer. (0)

5. The implant of claim 1, further comprising: (5) (3)

ventricular detection means, adapted to detect the occurrence, or the absence of occurrence, of a spontaneous ventricular event in a heartbeat;

ventricular stimulation means, adapted to apply a ventricular stimulation in the absence of spontaneous ventricular event detected by the ventricular detection means; and

sequencing means, adapted to define an instant of application of the stimulation after a predetermined atrioventricular delay following an atrial event detected by the atrial detection means.

6. The implant of claim 5, wherein the ventricular detection means are means adapted to detect the occurrence, or the absence of occurrence, of a spontaneous ventricular event by analyzing the variations of the oscillating electrical signal delivered by the transducer. (0)

8. The implant of claim 5, wherein the sequencing means comprise: (1) (2)

10. The implant of claim 5, wherein the sequencing means further comprise means adapted to temporarily activate the atrial detection means after each later spontaneous or stimulated ventricular event detected by the ventricular detection means. (1) (0)

12. The implant of claim 5, wherein the atrial detection means further comprise means adapted, after each later spontaneous or stimulated ventricular event, to: (2) (2)

upon detection of an atrial event, evaluate the contribution to the heartbeat of this atrial event; and

decide that an atrial event is present if said evaluated contribution fulfils a predetermined criterion.

13. The implant of claim 12, wherein the atrial detection means further comprise means adapted, beforehand, to: (1) (2)

16. The implant of claim 12, wherein the atrial detection means further comprise means adapted, beforehand, to: (0) (2)

15. The implant of claim 5, further comprising: (0) (2)

7. The implant of claim 1, further comprising: (0) (3)

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Application US20190151666

AUTONOMOUS CARDIAC IMPLANT OF THE "LEADLESS CAPSULE" TYPE, WITH DETECTION OF ATRIAL ACTIVITY BY ANALYSIS OF THE CHARGING ELECTRIC SIGNAL DELIVERED BY AN ENERGY HARVESTING MODULE

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