Adjustable drainage valve
AssigneeSophysa
InventorPhilippe Negre
Life of this patent
Estimating the term…
Abstract
A drainage valve intended to be implanted and to drain the cerebrospinal fluid, including: a body defining a chamber into which there open an inlet port and an outlet port, a stopper capable of at least partially, or indeed completely, closing off the inlet port, a resilient return member exerting a resilient push force on the stopper towards the inlet port in order to open or close the port, a rotor housed in the chamber, able to rotate about an X-axis pivot and including a cam track on which the resilient return member rests such that the force exerted by the resilient return member on the stopper is modified by the rotation of the rotor.
Claims21
A drainage valve intended to be implanted under the skin of a patient and to drain cerebrospinal fluid, said valve comprising:
- a body defining a chamber into which there open an inlet orifice and an outlet orifice for the cerebrospinal fluid,
- a shutter able to shut off the inlet orifice at least partially, or even fully,
- an elastic return member designed to exert an influence on the shutter so as to push it, elastically, toward the inlet orifice so that the passage of cerebrospinal fluid through the inlet orifice is possible only if its pressure is greater than or equal to an opening pressure,
- a rotor housed in the chamber, able to rotate about an axis X between two extreme positions and comprising a camway against which the elastic return member bears so that the influence exerted by the elastic return member on the shutter is modified by the rotation of the rotor,
- the camway being defined by an interior profile of the rotor, directed toward the axis X, so that the elastic return member exerts, on the camway of the rotor, a force referred to as a “pulling force” comprising a component that is centrifugal with respect to the axis X.
Dependencies are inferred from the claim text.