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Publication Number
US-10357639-B2
Publication Date
2019-07-23
Expiration Date
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.
Core Innovation
The invention relates to an implantable adjustable cerebrospinal fluid drainage valve for hydrocephalus. The valve includes a shutter that closes the inlet orifice until cerebrospinal fluid pressure reaches an opening pressure, and that opening pressure is adjustable by rotation of a rotor housed in a chamber and modifying the force exerted on an elastic return member that influences the shutter.
A rotor rotates about an axis X between two extreme positions and cooperates with a camway so that the influence exerted by the elastic return member on the shutter is modified by rotation of the rotor. The camway is defined by an interior profile of the rotor directed toward axis X, so that the elastic return member exerts a pulling force comprising a component that is centrifugal with respect to axis X.
The interior camway changes how the opening pressure varies with rotor angle, enabling high precision in low-pressure ranges and a broad adjustable range, including very high pressures. The invention further describes embodiments with extensive camway lengths based on spiral, slot groove, or recess camways, optional magnetic-lock rotor indexing, and configurations where opening pressure increments or gradients evolve as constant, stepwise, or exponentially varying across rotor indexing positions.
Claims Coverage
Independent claim clm-00001 recites one core inventive drainage-valve architecture with multiple functional and structural limitations, particularly linking an implantable shutter and elastic return member opening-pressure threshold to rotor-driven camway geometry that produces a centrifugal component in a pulling force. No other independent claims are explicitly provided in the partial content.
Implantable CSF drainage valve with shutter and opening-pressure threshold
A drainage valve intended to be implanted under the skin of a patient and to drain cerebrospinal fluid, comprising a body defining a chamber having an inlet orifice and an outlet orifice, a shutter able to shut off the inlet orifice at least partially or fully, and an elastic return member exerting an influence on the shutter so that passage through the inlet orifice is possible only if CSF pressure is greater than or equal to an opening pressure.
Rotor with axis rotation modifying elastic-return influence via a rotor camway
A rotor housed in the chamber, able to rotate about an axis X between two extreme positions, comprising a camway against which the elastic return member bears such that the influence exerted by the elastic return member on the shutter is modified by rotation of the rotor.
Centrifugal pulling-force component produced by interior rotor profile directed toward axis X
A camway defined by an interior profile of the rotor directed toward the axis X, so that the elastic return member exerts a force referred to as a pulling force comprising a component that is centrifugal with respect to axis X.
The coverage centers on an implanted CSF drainage valve where a shutter opens only when CSF pressure reaches an opening pressure, and that opening pressure is adjusted by a rotor-driven interior camway. The rotor-driven camway geometry produces a pulling force on the camway with a centrifugal component relative to axis X, thereby modifying the elastic return member’s influence on the shutter as the rotor rotates.
Stated Advantages
Enables high precision in low-pressure ranges.
Provides a broad adjustable range, including very high opening pressures.
Allows opening pressure to vary with rotor angle by changing camway geometry, including extensive camway lengths.
Documented Applications
Implantable CSF drainage for hydrocephalus in a patient, with an adjustable opening pressure controlled by a rotor.
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