Abstract: According to the invention, said tissue endoprosthesis comprises an expandable support structure or stent held between an inner tissue structure and an outer coating consisting of a hemocompatible soft synthetic material which impregnates said inner structure through the openings in said support structure.

Abstract: Disclosed is a composite hemocompatible material and a method for producing a composite hemocompatible material. The composite material includes a synthetic substrate and an animal biological tissue. The animal biological tissue is interlinked the synthetic substrate so as to bond the animal biological tissue to the synthetic substrate and form the composite hemocompatible material.

Abstract: The present invention relates to a method for manufacturing a hemocompatible material comprising a synthetic substrate and animal biological tissue, according to which said animal biological tissue is dehydrated and adhered to said synthetic substrate by means of a dispersion of the material forming said synthetic substrate. According to the invention, the animal biological tissue is only dehydrated chemically by immersing said animal biological tissue in a bath consisting of a solution containing at least 80 wt % of polyethylene glycol.

Abstract: Disclosed is a method for producing a hemocompatible article. A non-thermally stabilized polytetrafluoroethylene membrane comprised of non-oriented fibers is heated to a temperature of around 400° C. and above the gel point of the polytetrafluoroethylene, while the membrane is being applied against a forming mold. The membrane is applied against the forming mold by generating a pressure differential between opposing faces of the membrane to form a conformed membrane. The conformed membrane is then cooled, thereby producing the hemocompatible article.

Abstract: The present invention relates to a method for manufacturing a hemocompatible material comprising a synthetic substrate and animal biological tissue, according to which said animal biological tissue is dehydrated and adhered to said synthetic substrate by means of a dispersion of the material forming said synthetic substrate. According to the invention, the animal biological tissue is only dehydrated chemically by immersing said animal biological tissue in a bath consisting of a solution containing at least 80 wt % of polyethylene glycol.

Abstract: A device for connection between a heart prosthesis and a person's natural auricles includes a structure for joining to the natural auricles with individual suture attachments mounted so as to be free in rotation and movable.

Abstract: Process for producing a hemocompatible article of complex configuration and article thus obtained. According to the invention, a membrane (1) of e-PTFE, the fibres (3) of which do not have any preferential orientation, is thermoformed.

Abstract: A process which forces a solar array (5) to operate permanently at its maximum power point MPP. This feature is available using a microprocessor (1) which receives permanently the amplitudes of operating point coordinates, a solar array voltage Vsa and current Lsa and its temperature T. The microprocessor (1) computes, using this data, the MPP of the solar array, whatever are the environmental conditions and ageing, and uses the MPP voltage Vmpp as the reference of a series or a shunt conventional power regulator (7) to force the solar array (5) to operate at this MPP. The MPP is computed solving one, two, or three unknown equation system, depending on the type of the power regulator managing the solar array voltage and the temperature, to get the electrical characteristics defining the power characteristics and solving the equation dP/dv=0.

Abstract: The invention is designed for continuous, rapid and effective monitoring of a solar or equivalent source in order successfully to arrange for it to operate at its point of maximum power (PMP) without interrupting the supply of electricity to users, with a conventional power-regulating structure of series or parallel type, governed by an independent module capable of calculating the voltage and current coordinates of said PMP (VPMP, IPMP) by applying an iterative algorithm and/or graphic methods. This module ideally requires only one measurement point, relating to the electrical characteristic, with the ambient conditions of said source, and as a result it delivers a reference signal, a continuous, stable voltage constantly representative of the evolution of the PMP, for the power regulator. In the event of the use of a power-regulating structure of S3R or ASR type, information about the PMP is immediate and requires no intermediate measurement point.

Abstract: Device for connection between a heart prosthesis and the natural auricles. According to the invention, the means of joining to the natural auricles are formed by individual suture attachments (11) mounted in such a may as to be free in rotation and to be movable.

Abstract: According to the invention, the hemocompatible material comprises a strong and leaklight synthetic substrate, to which a biological tissue adheres by virtue of the constituent substance of said substrate dispersing in a solvent.

Abstract: The invention relates to a conditioning circuit that measures operating points of a power supply to deduce therefrom the current-voltage characteristic thereof and to determine directly the voltage corresponding to its maximum power point, without using any kind of tracking algorithm that causes the operating point of the power unit to oscillate about the maximum power point. The maximum power point voltage VMPP is supplied to a controller which regulates a power cell by slaving it to the input voltage until the output voltage of the supply is equal to the maximum power point voltage VMPP. The invention also relates to a solar generator and an associated conditioning method. One particular application is to high-power satellites.

Abstract: The invention relates to a conditioning circuit that measures operating points of a power supply to deduce therefrom the current-voltage characteristic thereof and to determine directly the voltage corresponding to its maximum power point, without using any kind of tracking algorithm that causes the operating point of the power unit to oscillate about the maximum power point. The maximum power point voltage VMPP is supplied to a controller which regulates a power cell by slaving it to the input voltage until the output voltage of the supply is equal to the maximum power point voltage VMPP. The invention also relates to a solar generator and an associated conditioning method. One particular application is to high-power satellites.

Abstract: The present invention relates to an electrical energy regulator system for a power supply bus, the system including: an electrical energy storage unit, a solar generator having a plurality of cells, a system for regulating the bus power supply voltage adapted to impose on each cell one of the following three states: a first state in which the bus is supplied with current, a second state in which the storage unit (BAT) is supplied with current, and a third state in which the cell is shunted, the cells being divided by the bus voltage regulator system into: a first group in which at least one cell supplies power to the bus and one cell is assigned to regulation of the voltage of the bus and is in its first state only when maintaining a nominal bus voltage requires a top-up of current, and a second group in which at least one cell is either in a second state or in a third state, as a function of a required charging current of the storage unit, the number of cells in the second state being a function of

Abstract: The present invention relates to an electrical energy regulator system for a power supply bus, the system including:

Abstract: The charging control system for a battery of rechargeable electric storage cells, and in particular for a lithium battery, including cells connected in series which are adapted to be connected to a common electrical power supply. The system includes individual cell charging control units each of which is equipped with means adapted, in operation, to be connected to the power supply to take the energy necessary for charging a cell and which itself provides all of the operations for charging that cell using the energy thus taken.

Abstract: A method of controlling a chopper regulator, which method is a time-varying parameter-regulation method having a very wide passband and controlling energy at each instant, in which the stable state of the system at the following sample is predicted, thereby making it possible to achieve regulation under very good safety conditions. A circuit for implementing the method is also disclosed. The invention is particularly suitable for space applications.

Abstract: A circuit for regulating a parameter by means of a bidirectional current chopper structure suitable for transferring energy from an input network to an output network via the bidirectional current chopper structure, the current flowing through the structure being in the form of a triangular wave. The circuit is particularly suitable for space applications.

Abstract: A power supply module for control electronics of a DC motor, the module comprising a power cell of the stepdown type controlled as a function of peak current, the current flowing in both directions, and the module including a bridge stage likewise capable of passing current in both directions and including a reactive element constituted by one of the windings of the DC motor. The invention is particularly suitable for space applications.

Abstract: A circuit for regulating an electrical parameter to be servo-controlled by transferring electricity between two networks (11, 12), wherein the circuit (10) is a bidirectional current circuit providing electrical isolation between the two networks (11, 12). The circuit is particularly applicable to space applications.