Self adjusting hydrocephalus valve
First Claim
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1. A self adjusting hydrocephalus valve for regulating cerebrospinal fluid in a patient, comprising:
- a housing enclosing therein a chamber that is able to permit fluid flow therethrough;
an inlet port in fluid communication with the chamber to accommodate passage of fluid into the chamber, and an outlet port in fluid communication with the chamber to accommodate passage of fluid out of the chamber; and
a valve mechanism disposed within the housing for regulating the rate of fluid flow through the chamber, the valve mechanism including a valve seat adjacent to an opening in the inlet port, a blocking member configured to seat in the valve seat, and a biasing element for exerting a biasing force against the blocking member to selectively maintain the blocking member against the valve seat and prevent fluid flow therethrough, the biasing element being configured to respond to a pressure difference within the valve, the biasing element having an adjustable, damped resistance to allow fluid release at a rate which is proportional to an average pressure difference over time, wherein the biasing element comprises a closed fluidic system.
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Abstract
A self adjusting hydrocephalus valve that continuously drains cerebrospinal fluid at a rate which is proportional to the average pressure difference across the valve. The valve employs a ball-in-cone mechanism having an associated biasing element that is insensitive to high frequency pressure variations for regulating the opening of the valve mechanism. The biasing element includes flexible bellows having a preset tension.
37 Citations
14 Claims
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1. A self adjusting hydrocephalus valve for regulating cerebrospinal fluid in a patient, comprising:
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a housing enclosing therein a chamber that is able to permit fluid flow therethrough; an inlet port in fluid communication with the chamber to accommodate passage of fluid into the chamber, and an outlet port in fluid communication with the chamber to accommodate passage of fluid out of the chamber; and a valve mechanism disposed within the housing for regulating the rate of fluid flow through the chamber, the valve mechanism including a valve seat adjacent to an opening in the inlet port, a blocking member configured to seat in the valve seat, and a biasing element for exerting a biasing force against the blocking member to selectively maintain the blocking member against the valve seat and prevent fluid flow therethrough, the biasing element being configured to respond to a pressure difference within the valve, the biasing element having an adjustable, damped resistance to allow fluid release at a rate which is proportional to an average pressure difference over time, wherein the biasing element comprises a closed fluidic system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A self adjusting hydrocephalus valve for regulating cerebrospinal fluid in a patient, comprising:
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a valve mechanism disposed within a housing for regulating a fluid flow rate through the housing, the valve mechanism comprising; (i) a blocking member configured block an inlet to the housing, and (ii) a biasing element for biasing the blocking member against the inlet to the housing to prevent fluid flow through the inlet, the biasing element being configured to respond to a pressure difference between an outside environment of the housing and an inside environment of the housing, the biasing element having an adjustable, damped resistance to the pressure difference, wherein the biasing element comprises a closed fluidic system. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification