FR3121606A1 - Electrical stimulation device having an optimized means of energy harvesting - Google Patents

Abstract

Electrical stimulation device of cylindrical shape or having at least one axis of symmetry operating thanks to an energy recovery device in the form of a pendulum with piezoelectric or electromagnetic effect. Figure for the abstract: Fig 6

Description

Electrical stimulation device having an optimized means of energy harvesting

The invention relates to active medical devices and more particularly to muscle (in particular cardiac) and nervous stimulation devices.

The stimulation of a target tissue (muscle or nerve) requires the production of an electrical impulse in order to depolarize a cell and obtain a biological effect, as is well known to those skilled in the art.

In the field of pacemakers, a recent advance in this field concerns the production of systems without endocavitary probes (called “leadless”) which are currently marketed as the MICRA TPS system from Medtronic or Nanostim from Abbott (as by example in patent application WO 2012/051235 A1)

These devices are presented as improvements to existing devices through advanced miniaturization making it possible to eliminate the cardiac stimulation probe making the connection between a cardiac stimulation box and the heart. In this classic system, the stimulation box has a high-density battery to power the device and the electronics as well as means of communication with external systems by telemetry for example.

Other devices have been revealed via the use of energy recovery systems which make it possible to envisage a longer life than that of high-density batteries.

Some of these energy harvesting devices use an inertial mass associated with a fixed embedded beam system with one degree of freedom conventionally called a "cantilever". The energy recovery system in this context uses a piezoelectric transducer which converts the ambient mechanical stresses applied to a cardiac stimulation system into electricity. The use of an inertial mass makes it possible to obtain resonance frequencies compatible with the amount of harvested energy needed to power a pacing device. The usually rated level of energy is 10 microwatts per cycle of operation to power a leadless pacemaker. Such devices are described in patents or patent applications US 2017/0151429 A1, US 2009/0171408 A1, FR 3082434 A1, FR 2960156 A1, FR2982163 A1. They have a generally cylindrical shape.

One of the essential elements of this type of approach is that the system in which the stimulator is implanted is in constant motion while the implanted device remains fixed at its point of attachment. For example, in the case of the heart, the movements of the heart in systole and in diastole, movements of the patient, respiratory movements or else in the case of an implantation on a nerve or a muscle, the movements of the limbs or the body of the patient or on a smooth muscle in the case of the digestive tract, with the automatic contractions of the smooth muscle cells linked to the autonomic innervation.

In the case of a leadless pacemaker, the Fourrier analysis of cardiac contraction finds a maximum of oscillations for frequencies below 50 Herz. One of the drawbacks then lies in that the acoustic wave generated by the myocardial contraction in particular has a direction and in that the plate of the electromechanical transducer (in particular piezoelectric) which has only one degree of freedom will reduce its energy production. if it is not optimally oriented.

Another element to be taken into account is that the implantation of a device in the heart is subject to other constraints, in particular the technical difficulties of implantation related to non-stimulable areas (necrosis) or instability of the material (movement) which may restrict the optimization of the quantity of energy recovered and the possibilities of installation.

Thus, the mechanical stress exerted on the device varies in its direction of application from one operating cycle to another on the one hand and according to its orientation according to its anchor point in the target tissue: this making the energy recovery is not optimized with a variation from one operating cycle to another of the recovered energy.

In EP 3693056, an energy recovery device is described comprising an actuator rotating the electromechanical transducer operating by piezoelectric effect.

One of the harmful effects of this approach lies in the fact that the actuator induces additional energy expenditure on the one hand and presents a bulk in the total volume of the device which complicates its miniaturization, an essential characteristic in the case of a device intended to remain in the body of a living being. Finally, this approach also induces a limit to the rotation of the device around its axis (ie 180° according to the patent application), this limit being inherent with the ability of the actuator to rotate the electromechanical transducer. This can become problematic in the case of a device with a very long lifespan (more than 15 years) since even if the system only achieves a small variation in daily position, it is plausible that over the lifespan of the device several complete rotations can take place and induce a blockage of the system.

The interest of the device described in the present invention is to solve these difficulties by designing a device which presents a three-dimensional optimization of energy harvesting by making the electromechanical transducer, in particular piezoelectric, more efficient and adaptable.

The present invention relates to a preferably biocompatible electrical stimulation device powered by an optimized energy harvesting system implanted in or on a moving system. In the particular case of its application to a living being, the invention lends itself particularly to systems dedicated to implantation in or on the heart, on a nerve or even a non-cardiac muscle.

The object of the invention is an energy recovery system which adapts to the direction of application of the mechanical stress applied to the stimulation device. This new system makes it possible to increase the energy density (i.e. the quantity produced per unit volume of the energy harvester) produced by using the volume of the energy harvesting device in an optimized manner.

Typically, the adaptation is done by aligning the energy harvesting device with the axis of the mechanical stress in order to generate the maximum amount of energy.

The alignment is obtained by a passive rotation of the energy harvesting device according to the external mechanical stress exerted on the device. This rotation is obtained by a mechanical connection using a mechanical bearing (in particular, a ball, tapered roller or needle bearing or any functional equivalent). Such bearings are currently marketed, for example, by the company MinebeaMitsumi with the reference DDL-310 as seen at " https://datasheets.globalspec.com/ds/50/NMBTechnologies/9B7A542E-EBC0-40BB-AECF-D001030D1A6B "

Characteristically, the rotation does not call for active energy expenditure on the part of the system, unlike EP 3693056.

Indeed, the state of the art finds in the patent application EP 3693056, an active device which seeks the position of the energy recovery system which maximizes the quantity of energy generated and which will maintain in this position the recovery system. of energy. It is not described nor considered nor suggested a passive system which would make it possible to optimize the recovery of energy. The passive nature of the system has the advantage of higher robustness, lower energy expenditure and reduced bulk since there is no active actuator to set the device in motion.

In a particular mode of the description of the invention, the case of an electromechanical transducer of the piezoelectric type will be described, but obviously, the device can be dedicated to other energy recovery systems, for example electrostatic or electromagnetic such as those described in FR 2987708 A1 or US 2013/0303872.

In this context, only the materials that can be used to generate a piezoelectric effect will be retained, for example and without being limiting, ferroelectric materials of perovskite structure such as for example PZT, quartz and non-ferroelectric oxides, Semiconductors of groups III-V of zinc-blende structure and II-VI of wurtzite structure and in particular aluminum nitride (AlN) and zinc oxide (ZnO) or else a polymer such as PVDF (polyvinylidine difluoride) or PVDF- TrFE (polyvinylidine difluoride trifluoroethylene) or even composite materials formed from a piezoelectric part (for example PZT) and from a non-piezoelectric part (for example an epoxy resin) or finally microelectromechanical systems in thin layers.

The optimized energy recovery device according to the invention comprises a central axis (C) and has supports such as discs or blades (L) implanted in diametrically opposite pairs and perpendicular to its major axis giving a pendulum shape to the structure ( ). The central axis has the same orientation as the major axis of the electrical muscle or nerve stimulation device. The stimulation device has at least one axis of symmetry by construction. It is for example of cylindrical or ovoid or spherical shape.

Preferably, the central axis (C) has a cylindrical or parallelepiped shape.

In a first embodiment ( ), the central axis (C) is rotatable along its major axis and has rotation means at its 2 ends, for example a mechanical bearing and preferably a ball bearing which makes it possible to obtain this movement. In this embodiment of the invention (designated mode 1), the central axis (C) will be implanted at its 2 ends in the rotor of two ball bearings, the stator being integral with the body of the electrical stimulation device.

This defines an electrical stimulation device of cylindrical shape or having at least one axis of symmetry characterized in that it comprises an energy recuperator characterized in that it is composed of one or more pairs of flexible blades fixed on a central axis having a direction identical to that of the major axis of the device or of its axis of symmetry, the said blades being diametrically opposed and in that the blades are mobile in rotation without expenditure of active energy of the device and have an identical mass by pair of blades at their free end ( ).

An electrical stimulation device is thus defined having an axis of symmetry characterized in that it comprises and in that it comprises an energy recuperator characterized in that it is composed of one or more pairs of supports, flexible blades fixed perpendicularly on a central axis having a direction identical to that of the axis of symmetry of the device, the said blades being diametrically opposed in pairs and in that the blade or disc supports are mobile in rotation without expenditure of active energy of the device and have an identical mass per blade pair at their free end.

In another embodiment of the invention (designated mode 2, and ), the central axis (C) is non-moving but each blade (L) is installed on a mechanical bearing positioned around the axis C. The installation zone of the blade (L) is carried out on the rotor of the bearing, the stator being internal and integral with or coincident with the axis (C).

A device according to the invention is defined, characterized in that supports such as discs or blades in pairs are implanted on a central axis of the device of cylindrical or parallelepipedal shape, characterized in that the 2 ends of the central axis are implanted on the rotor of a ball bearing, the stator of the bearing being integral with the body of the electrical stimulation device

There is also defined an electrical stimulation device having a cylindrical shape characterized in that it comprises an energy recuperator characterized in that it is composed of one or more support pairs, blades or discs, flexible fixed perpendicularly on an axis central having a direction identical to that of the major axis of the cylinder, the said supports, blades or discs being diametrically opposed and in that the supports, blades or discs are mobile in rotation without expenditure of active energy of the device and have an identical mass by pairs of blades at their free end.

Whatever the embodiment, the blades behave like interlocking beams with a degree of freedom and are characterized in that they have at least one layer (preferably two) of piezoelectric element on at least one face, said layer which can occupy the entire surface or part of the face of the blade on the one hand and a seismic mass is located at their free end on the other hand. By way of example, the layer of piezoelectric element can be deposited on 25% of the surface of the blade or else 50% or even 75% or 95% of the surface of the blade, the remainder of the surface being blank or well reserved for electromagnetic elements or the seismic mass. Alternatively, the blades can be covered with an electromagnetic material or else be covered on one face with a material with a piezoelectric effect and on another face with a material with an electromagnetic effect. Within the device, the blades can be covered for certain binomials by a piezoelectric material and for other binomials by an electromagnetic material.

The blades are located on the central axis C according to embodiment 1 and on a mechanical bearing (rotor) integral with axis C via its stator (embodiment 2) and characteristically are arranged in diametrically opposed pairs. The blades of different pairs belong to the same plane at rest.

Also characteristically, the seismic mass is identical between the pairs of blades. The shape and weight of the mass can vary from one pair to another depending on its position relative to the ends of the C axis in order to allow optimization of the stress exerted by the moment of forces applied to the blades .

Preferably, the amplitude of the oscillation of the blades thus defined cannot exceed an angle of 30° with respect to the axis of rest. There is therefore an oscillation of a maximum of 60° between the 2 extreme positions of the mass in this embodiment).

In a particular embodiment ( , ), it is possible, for example, to reduce or increase the number of pairs of blades without changing the general geometry of the device) or to favor the energy density by producing pairs implanted at 70° (in the case of a maximum oscillation of 60 °) with respect to each other, for example, which makes it possible to increase the density of energy produced. In another embodiment, if the slats oscillate at an angle of 60°, 3 pairs of two slats can be fixed at the same distance from one relative to another.

An electrical stimulation device is thus defined, characterized in that it comprises an energy recuperator, characterized in that it is composed of one or more pairs of blades in pairs fixed on the rotor of a ball bearing and that the stator of the ball bearing is integral with a central axis having the same direction as the major axis of the device on the one hand and that the blades have at their free end an identical mass for each pair.

In another preferred embodiment (designated mode 3, ( , )), the electromechanical transducer is composed of a film of PVDF-TrFE (Polyvinylidenefluoride-co-trifluoroethylene) optionally associated with a layer of graphene or else of a polymer with piezoelectric effect allowing the production of a thin flexible layer. The film is stretched between 2 blades placed on the same side of the central axis. In this context, 2 films can be placed: one is stretched between the upper part of the 2 blades and the other on the lower part of the 2 blades respectively.

There is an oscillating mass positioned at the distal end of the blades. This mass is connected to the distal end of the 2 blades. The mass can have different dimensions in order to allow a homogeneous movement of the blades. Similarly, the blades of different pairs may have a different shape but must be identical between pairs in order to retain the characteristic pendulum appearance of the invention.

Obviously, the transducer has a symmetrical appearance in the form of a pendulum along the central axis. It is the bending of the blades that will induce mechanical stress on the PVDF-TrFE film(s) and generate electrical charges. In an obvious form deriving from the invention, the PVDF-TrFE film can be replaced by any fine and flexible compounds having a piezoelectric property in particular, any polymers with a piezoelectric effect or microelectromechanical system.

We thus define in mode 3, an energy recovery device according to the invention operating by piezoelectric effect characterized in that it is formed of 4 flexible blades L1, L2, L3 and L4 characterized:

• in that they belong to the same plane at rest,
• in that they are fixed at one of their ends to a common central axis or to a rotor of a mechanical bearing, the stator of which is fixed to a common central axis
• in that L1 is diametrically opposed to L2 with respect to the central axis
• in that L3 is diametrically opposed to L4 with respect to the central axis
• in that the free ends of L1 and L3 are integral with a mass M
• in that the free ends of L2 and L4 are integral with the same mass M,

the electromechanical transducer being formed of a film of PVDF-TrFE, polyvinylidine difluoride trifluoroethylene, or else of a film of PVDF-TrFE (Polyvinylidenefluoride-co-trifluoroethylene) associated with a layer of graphene or else of a polymer with piezoelectric effect produced in a thin layer fixed between the upper and lower ends of the blades L1 and L3 and respectively L2 and L4 and generating an electric charge by the bending movements of the blade pairs.

In a last preferred embodiment (designated mode 4), the energy recovery system is described in the form of a pendulum external to the electrical stimulation system and connected to the latter only by an electrically insulated conductor in order to convey the charges produced. In the case of a device implanted in a living being, the energy recovery system according to the invention in the form of a pendulum is treated to be biocompatible, for example using glutaraldehyde, parylene or else using a coating with a biological tissue (based on pork or beef pericardium of cells cultured in vitro homologous or heterologous to the patient) on the blades and the oscillating weights in order to avoid allergic and thrombogenic reactions. The blades can either be produced according to Mode 1 or 2 according to the invention in this context with the application of the biocompatible treatment used routinely in the context of biological heart valves for more than 50 years.

The advantage of this embodiment is an increase in the quantity of energy recovered since there is no absorption by the casing of the electrical stimulation device of part of the mechanical stress exerted on the device. and therefore optimized energy generation. The fact of being able to preferentially align the energy harvester on the mechanical constraint via a passive rotation allows here again to allow a greater resilience of the system and to miniaturize it.

Characteristically, the central axis (C) has means for recovering the charges produced by the piezoelectric element and makes it possible to bring them to the 2 ends of the cylinder or else to the energy storage device (denoted E) in using a conductive electrode making the link or using a conductive material as the component of the central axis (C).

In the "mode 1" embodiment, the central axis C comprises at its ends an electrically insulating zone (denoted G on the ) delimiting on one side the junction with the mechanical bearing, preferably ball bearing, and on the other the area composed with the piezoelectric transducers according to the invention. Specifically in this embodiment, the device electronics will be connected to the part of the central axis located on the side of the ball bearing (designated by K on the ).

In the "mode 1", "mode 2" or "mode 3" embodiments, the mechanical bearing, preferably ball bearings, is designed to be able to conduct the electric charges from the rotor to the stator as is proposed for example in the bearings of the Klüber company (for example under the reference Klüberlectric BE 44-152 of Klüber Lubrication visible on the website https://www.klueber.com/fr/fr/produits-et-services/produits/klueberlectric-be-44- 152/9955/) or by conductive lubricants of the tecnolubeseal brand (for example under the reference Nyogel 753G or Nyogel 756G visible on the site "http://www.tecnolubeseal.it/products/dissipative-or-conductive- pastes/?lang=en”) or any other functional equivalent.

The energy of the electrical pulse will therefore be conducted from the rotor to the stator of the device then to the area in contact with the tissue to be stimulated or to the energy storage organ.

The advantage of the ball bearing is that the transducer will not be directly solicited to align itself and therefore will limit the wear phenomenon as in the case of a finger ball joint. This increases the longevity of the device.

Characteristically, the balance-like composition of the piezoelectric transducer allows for the development of a balance that is broken only by a change in external stresses (e.g., body orientation, change in blood flow axis, increase in the flow exerted on the device) by seeking a new balance without the need for an external actuator on the one hand and the system is not limited by a number of turns around its axis throughout its operation unlike EP 3693056 where the device is limited to a rotation of 180° with respect to its initial position thanks to the use of passive conductive mechanical bearings.

Characteristically, the fact of using as an energy recovery system a number of blades greater than or equal to 2 (preferably greater than 6) makes it possible to increase the robustness of the system in the event of failure of a blade in the event of a fault. technical.

Similarly, the fact of obtaining a decentralized energy generation by each blade makes it possible to optimize the number of pairs of blades necessary in order to generate the desired quantity of energy in a simpler way than in a single blade system and thus lead to further miniaturization of the device.

Characteristically, it is the ability to set the piezoelectric transducer in motion by its pendulum structure that will allow it to be aligned optimally with the physical stress exerted on the stimulation system and to obtain better energy efficiency cycle to cycle. . This is made possible regardless of the composition of the electromechanical transducer.

For example, in the case of an electromagnetic transducer, the implanted device subjected to a given external magnetic field allows better alignment of the blades and optimizes the induction effect generating the current sought to power the electrical stimulation device.

This method of alignment on the mechanical constraint thus makes it possible to be able to increase the quantity of energy recovered at each cycle and consequently to reduce the amplitude of displacement of the seismic mass and thus to reduce the diameter of the device and consequently the dimensions of the energy recovery system. A reduction of 30% to 50% of the volume dedicated to energy recovery can be envisaged with this system in comparison with existing devices.

The device thus described can be applied to any system in motion and is not limited only to devices implanted in the heart but can also be placed externally on a machine or on the body of a patient (for example a sensor of a biological constant).

A 3-dimensional optimized energy recovery device is thus obtained with a gain in terms of reduced volume for the same energy recovery.

Preferably, the dead space (E) between the extreme positions of the slats is used to locate technical elements (electronics, buffer battery, communication system, etc.).

In a preferred embodiment, the dead space will contain, in addition to the space allocated to energy storage, the electronics of the device and the component generating the electrical pulse. These technical elements can either be fixed on the central axis (C) of the energy recovery device in embodiment 1 or 3 or else in embodiments 2 or 3 on the rotor(s) of the contactless system direct with the central axis ( C ) or else in contact with the 2 (central axis and rotor). the energy of the device positioned in space (E) will move simultaneously and in the same proportion as the blades of the electromechanical transducer.

Thus, by grouping the electronics and the energy storage in the dead space (E), the volume dedicated to the recovery of energy which can be developed over the entire length of the stimulation device is optimized, avoiding the division into juxtaposed independent volumes which increase the total volume of the device.

The invention also relates to a method of operating the electrical stimulation device for the production and recovery of energy according to FIGS. 3 to 7, characterized by the following steps: 1) Application of an external mechanical stress on the wall of the device then 2) setting in motion of the supports in pairs in the form of a pendulum (blades or discs) due to the stress applied in 1) then 3) passive rotation of the pendulum until its point of equilibrium, then 4) oscillation of each pair of blade or disc, then 5) production of electric charges by piezoelectric or electrostatic effect and 6) recovery of the charges up to a buffer battery or a storage tank.

The invention in its entirety as described also encompasses variants offering the same functionalities and advantages. The examples of the various possibilities of carrying out the invention are illustrations and are not to be limited thereby. On the contrary, the present invention includes all variants implementing the innovative features built on the functional equivalents.

Description of figures

shows a longitudinal section of the stimulation device according to the invention

A.central axis.

B. blade in pairs diametrically opposed to the central axis

C. oscillating weight positioned at the free end of blade B

D. stimulation device

shows a view of the stimulation device according to embodiment 1

A. Central axis

B. blade in pairs diametrically opposed to the central axis

C1.oscillating weight positioned at the free end of slat B.

C2.oscillating mass of a binomial with a different geometry and a mass different from that of C1.

D. stimulation device

E. dead space on either side of the integral central axis comprising elements such as electronics, the buffer battery.

F.Junction between the dead space and the central axis which allows to recover the charges produced by the electromechanical transducer.

N. Electrical insulation

K.electrical conductor

represents a section perpendicular to the central axis passing through a pair of blades according to mode 1.

A. Central axis

B. blade in pairs diametrically opposed to the central axis

C1.oscillating weight positioned at the free end of slat B.

E. dead space on either side of the integral central axis comprising elements such as electronics, the buffer battery.

H. coating of the blade with a material having a piezoelectric effect (here, partial coating on the 2 sides of the blade B)

represents a section perpendicular to the central axis passing through a pair of blades according to mode 2.

B. blade in pairs diametrically opposed to the central axis

C1.oscillating weight positioned at the free end of slat B.

E. dead space on either side of the integral central axis comprising technical elements such as electronics, the buffer battery.

F. ball bearing rotor

G.stator of the ball bearing

H. coating of the blade with a material having a piezoelectric effect

represents a profile view according to the "mode 2" embodiment

A. Central axis

B. blade in pairs diametrically opposed to the central axis

C1.oscillating weight positioned at the free end of slat B.

C2oscillating weight positioned at the free end of blade B.

F. ball bearing rotor

G.stator of the ball bearing

represents a view of the energy recovery device according to “mode 3”.

A. Central axis

L1.blade 1

L2.Blade 2

F1.thin film composed of PVDF-TrFE fixed on L1 and L2 in their upper part.

F2. Thin film composed of PVDF-TrFE fixed on L1 and L2 in their lower part

M.oscillating mass fixed on the distal end of blades 1 and 2.

represents a view of the energy recovery device according to "mode 3" with 2 ball bearings positioned along 2 pairs of blades.

A. Central axis

L1.blade 1

L2.Blade 2

F1.thin film composed of PVDF-TrFE fixed on L1 and L2 in their upper part.

F2. Thin film composed of PVDF-TrFE fixed on L1 and L2 in their lower part

M.oscillating mass fixed on the distal end of blades 1 and 2.

F. ball bearing rotor

G.stator of the ball bearing

Claims (9)

Electrical stimulation device having an axis of symmetry subjected to an external constraint, characterized in that it comprises an energy recuperator composed of one or more pairs of supports, blades or flexible discs fixed perpendicularly to a central axis having a direction identical to that of the axis of symmetry of the device, said supports, blades or discs being diametrically opposed in pairs and in that the blade supports or discs are rotatable, so as to align the energy recovery device on the axis of the external mechanical stress, the alignment being capable of being obtained by passive rotation of the energy recovery device as a function of the external mechanical stress exerted on the device and have an identical mass per pair of supports, blades or disks at their free end. Electrical stimulation device according to claim 1 having a cylindrical shape characterized in that it comprises an energy recuperator characterized in that it is composed of one or more support pairs, blades or discs, flexible fixed perpendicularly on an axis having a direction identical to that of the major axis of the cylinder, said supports, blades or discs being diametrically opposed and in that the supports, blades or discs are rotatable, so as to align the energy recovery device on the axis of the external mechanical stress, the alignment being capable of being obtained by passive rotation of the energy recovery device as a function of the external mechanical stress exerted on the device and having an identical mass per pair of supports, blades or discs at their free end. Device according to Claim 1 or 2, characterized in that the blades or discs in pairs are installed on a central cylindrical or parallelepipedal axis, characterized in that the 2 ends of the central axis are installed on the rotor of a bearing with balls, the stator of the bearing being integral with the body of the electrical stimulation device Electrical stimulation device according to Claim 1, 2 or 3, characterized in that it comprises an energy recuperator, characterized in that it is composed of one or more pairs of blades or discs in pairs fixed on the rotor of a ball bearing and that the stator of the ball bearing is integral with a central axis having the same direction as the axis of symmetry of the device on the one hand and that the blades or the discs have at their free end an identical mass for each pair. Device according to Claim 1, 2, 3 or 4, characterized in that the blades or discs are covered in whole or in part by a material with a piezoelectric effect or by an electromagnetic material. Energy recovery device according to any one of Claims 1 to 5 according to the invention operating by piezoelectric effect, the energy recovery device comprising an electromechanical transducer, characterized in that it is formed of 4 flexible blades L1 , L2, L3 and L4 characterized:
a) in that they belong to the same plane at rest,
b) in that they are fixed at one of their ends to a common central axis or to a rotor of a mechanical bearing whose stator is fixed to a common central axis
c) in that L1 is diametrically opposed to L2 with respect to the central axis
d) in that L3 is diametrically opposed to L4 with respect to the central axis
e) in that the free ends of L1 and L3 are integral with a mass M
f) in that the free ends of L2 and L4 are integral with the same mass M,
the electromechanical transducer being formed of a film of PVDF-TrFE, polyvinylidine difluoride trifluoroethylene, or else of a film of PVDF-TrFE (Polyvinylidenefluoride-co-trifluoroethylene) associated with a layer of graphene or else of a polymer with piezoelectric effect produced in a thin layer fixed between the upper and lower ends of the blades L1 and L3 and respectively L2 and L4 and generating an electric charge by the bending movements of the blade pairs. Device according to one of the preceding claims, in that the device is a muscle stimulator. Device according to one of the preceding claims in that the device is a nerve stimulator. Method of operating an electrical stimulation device according to any one of claims 1 to 6 for the production and recovery of energy characterized by: 1) Application of an external mechanical stress on the wall of the device, 2) placing in movement of the supports in pairs in the form of a pendulum, blades or disks, due to the mechanical stress applied in 1), 3) passive rotation of the pendulum until its point of equilibrium, 4) oscillation of each pair of support, blade or disk, 5) production of electrical charges by piezoelectric or electrostatic effect, 6) recovery of charges to a buffer battery or a storage tank.