Abstract: Disclosed is an implantable one-piece heart prosthesis having a driving artificial ventricle and a driven artificial ventricle. A main actuator is configured to transmit to the driving artificial ventricle diastolic and systolic flow rates having desired respective values for the driving artificial ventricle. An auxiliary actuator is configured to transmit to the driven artificial ventricle correction systolic and diastolic flow rates that correct the systolic and diastolic flow rates transmitted by the main actuator to the driven artificial ventricle.

Abstract: Implantable one-piece heart prosthesis. According to the invention, the prosthesis comprises a main hydraulic actuator (13t) arranged between the artificial ventricles (2 and 8) and designed to actuate, with desired flow rates, one (8) of said artificial ventricles, and also an auxiliary hydraulic actuator (7t) designed to correct the diastolic and systolic flow rates of the other (2) of said ventricles.

Abstract: According to the invention the rotary pump consists of an external gear (13) with internal teeth (16) in the form of a squirrel cage, and an internal gear (9), housed in an off-centre manner in the interior of said external gear (13) and fitted with external teeth (9D) intermeshing with said internal teeth (16) and consisting of a number of inferior teeth of a unit with the number of teeth of the later. The rotation means of said external teeth (13) comprise at least a bearing (11, 12) centrally laid out in a flange end (14,15) of said aforementioned external gear (13) and the aforementioned external gear (13) is at least partly dismantled in order to introduce said internal gear (9).

Abstract: According to the invention the rotary pump consists of an external gear (13) with internal teeth (16) in the form of a squirrel cage, and an internal gear (9), housed in an off-centre manner in the interior of said external gear (13) and fitted with external teeth (9D) intermeshing with said internal teeth (16) and consisting of a number of inferior teeth of a unit with the number of teeth of the later. The rotation means of said external teeth (13) comprise at least a bearing (11, 12) centrally laid out in a flange end (14,15) of said aforementioned external gear (13) and the aforementioned external gear (13) is at least partly dismantled in order to introduce said internal gear (9).

Abstract: The surface of a first fixed member (2) having at least one hydraulic-fluid passage (12, 18) is in contact with the surface of a second movable member (4) controlled by an actuating system (28, 30) and having at least one shut-off zone (6) and at least one recess (20) forming a zone exposing the said passage; at least one of the passages consists of a plurality of nozzles (12) which are pierced in the first member and are at a distance from one another and which are arranged on at least one track (14) directed parallel to the relative movement of the two members; the said actuating system is a step-by-step system driving the movable member in increments of a value d; the recesses (20) and the shut-off zones (6) on the second member are such that the said nozzles are exposed or shut off in turn at each advance of the movable member (4) by an increment d.

Abstract: A ball and socket joint for use in mechanical linkages, especially for ball-ended connecting rods in a multi-cylinder hydraulic pump comprises a ball head forcibly inserted into a socket which extends over more than a hemisphere and which is formed as a cylindrical seating member. Radial slits around the mouth of the socket allow the necessary distortion and then the mouth of the socket is squeezed and held by a hoop or ring or counter-plates, and the seating member is inserted in a cylindrical recess in a further component.

Abstract: A multicylinder hydraulic machine of the split-shaft kind comprises a rotatable shaft and a drive plate fixed on the shaft and linked to piston and rod units received in the cylinders of the drum. Liquid flow is through orifices in a distribution plate non-rotatably positioned around the shaft, through ducts in the drive plate and through the piston and rod units which are hollow. The shaft is rotatably mounted and axially located by conical bearings. The distribution plate is mounted in an axially floating manner and a hydraulic abutment is developed between the distribution plate and the drive plate during operation of the machine so as to reduce the force on the shaft bearings.

Abstract: A method for measuring the surface roughness of a workpiece, comprising filling two capacitors with a compressed gas at specific pressures; applying to the rough surface of the workpiece to be studied the open end of a bell-form sensor connected to a second one of the capacitors; evacuating simultaneously and individually to atmosphere the two capacitors, the first through a calibrated throttle, the second through the leak existing between the edge of said sensor bell and the rough surface of the workpiece; measuring, during evacuation, the difference between the pressures in the two capacitors; and deducing from this pressure differential, by standardization with sample pieces of known roughness, the roughness of the piece studied.