Abstract: The invention relates to a subcutaneous valve having opening pressure that can be adjusted non-invasively from the outside, said valve comprising a body presenting a chamber with a cylindrical inside side wall, an inlet duct and an outlet duct for cerebospinal fluid both opening out in said side wall, a valve member such as a ball placed at the inside end of said inlet duct, a spring blade fitting closely to the side wall of said chamber and urging the valve member against its seat, and a moving member controlled from the outside and provided with means for locking it in a determined position, the length of the spring blade acting on the valve member being determined by the position of said moving member. The valve is remarkable in that said moving member is constituted by a resilient flexible arcuate blade fitting closely to the cylindrical inside wall of said chamber. The valve is applicable to the treatment of hydrocephalus.

Abstract: The invention relates to a subcutaneous valve having opening pressure that can be adjusted non-invasively from the outside, said valve comprising a body presenting a chamber with a cylindrical inside side wall, an inlet duct and an outlet duct for cerebospinal fluid both opening out in said side wall, a valve member such as a ball placed at the inside end of said inlet duct, a spring blade fitting closely to the side wall of said chamber and urging the valve member against its seat, and a moving member controlled from the outside and provided with means for locking it in a determined position, the length of the spring blade acting on the valve member being determined by the position of said moving member. The valve is remarkable in that said moving member is constituted by a resilient flexible arcuate blade fitting closely to the cylindrical inside wall of said chamber. The valve is applicable to the treatment of hydrocephalus.

Abstract: A subcutaneous valve is provided for the treatment of hydrocephalus adapted to be inserted between a ventricular catheter and a distal catheter. The valve comprises a body enclosing a chamber having formed through its cylindrical wall an inlet and outlet passage for cephalorachidian fluid. A rotor is journaled in the chamber for rotation about the chamber axis. A spring blade, fixed to the rotor extends arcuately along a cylindrical wall, bearing deflectably outwardly against a valve member and slides thereon to bias the member against a valve seat with a force depending on the angular position of the rotor and the chamber. The rotor is a disk in the form of a cut-out circular sector having a peripheral surface and two radial end surfaces. A stop means extends from a bottom wall of the chamber between the radial end surfaces of the rotor.

Abstract: This valve adapted to be inserted between a ventricular catheter and a draining catheter comprises a body of flattened cylindrical shape enclosing a chamber having formed through its cylindrical wall an inlet passage for introducing the cephalorachidian fluid and an outlet passage for discharging this fluid. At the inner end of the inlet passage a frustoconical seat engageable by a ball valve acting as a non-return valve is provided, this ball valve being urged against the seat by a curved spring blade extending along the lateral inner wall of the chamber and mounted preferably in overhanging relationship on a diameter bar of magnetic material mounted in turn for concentric rotation on a pivot pin extending across the chamber. A tooth carried by the bar end opposite the spring blade is adapted to engage detent-positioning dents formed in the lateral wall of the chamber.