Abstract: The invention relates to a dental implant comprising a biocompatible porous mass in which is arranged at least one receiving bore (8) for a linking piece of a dental prosthesis, characterised in that the biocompatible porous mass (2) is constituted by a single material of trabecular structure ensuring communication between the exterior of said porous mass and the internal of said porous mass.

Abstract: The invention concerns a cell culture chamber having at least two planar filtering membranes with different cut-off, delimited by an envelope with axis of symmetry formed by an outer lateral wall, two end walls and inlet ports and outlet ports for dynamic liquid media, and a bioreactor containing the culture chamber for extracorporeal culture of animal cells.

Abstract: The invention relates to a device for measuring the change in the diameter of a vein by the Doppler effect. The device operates such that when a first signal is generated, it controls a transmission and reception probe in continuous mode in order to obtain an audible signal from a speaker as a function of the position of a transmission and reception probe relative to a vein in order to locate the vein, and when a second signal is generated once the vein has been located, the second signal controls the transmission and reception probe in discontinuous mode and, from the changes in frequency between the transmitted and received ultrasonic waves, determines the diameter of the vein to ensure that its changes are displayed.

Abstract: The invention relates to a device for measuring the change in the diameter of a vein by the Doppler effect. The device operates such that when a first signal is generated, it controls a transmission and reception probe in continuous mode in order to obtain an audible signal from a speaker as a function of the position of a transmission and reception probe relative to a vein in order to locate the vein, and when a second signal is generated once the vein has been located, the second signal controls the transmission and reception probe in discontinuous mode and, from the changes in frequency between the transmitted and received ultrasonic waves, determines the diameter of the vein to ensure that its changes are displayed.

Abstract: A backpressure-modulating cartridge for a breathing mask includes a body defining a first chamber which communicates with the environment, a second chamber which communicates with the mask, and a passage which communicates with the first and second chambers. A guide rod is supported by the body and is disposed in the passage. A movable exhalation valve is supported by the guide rod in the first chamber and has at least one transfer hole opposite the passage. A mechanism is provided for urging the movable exhalation valve into a passage-closing position. A movable inhalation valve is provided which has a surface area that is smaller than a cross-section of the passage. A mechanism is provided for opposing the mechanism for urging such that the movable inhalation valve is urged to close the at least one transfer hole of the movable exhalation valve.

Abstract: The invention relates to a portable module for recording the cardiac activity of a person with the aid of a device delivering an ECG signal. The device includes a main energy source connected to a second energy source supplying a temperature sensor by a controlled circuit, a unit that picks up and processes an ECG signal, having an ECG signal filter stage, connected to two integrators with different time constants. The integrator outputs are connected to a comparator delivering a signal (E.sub.3) representing cardiac cycles. The device also includes a mechanism for placing the ECG signal pickup and processing unit in operation and a processor.