Device for regulating the flow of cerebrospinal fluid in a drainage circuit
First Claim
1. A device for regulating the flow of an organic liquid between a production site and a resorption site of a patient in a drainage circuit that extends between the two sites, one of the sites being a site of small pressure variation and the other being a site of large pressure variation as a function of the position of the patient, the device comprising a valve for implanting beneath the skin and for connecting by a first duct to one of the sites and by a second duct to the other site, the valve comprising a body defining an internal passage interconnecting the two ducts, a member for adjusting the section of said passage, and control means coupled to said adjustment member for moving said adjustment member between a first position in which the passage is closed and second positions in which the passage is opened to a controlled extent, wherein the control means comprise a first chamber formed in the body and closed in sealed manner by a diaphragm, a second chamber formed in the body and separated from said first chamber by the diaphragm, which second chamber forms a portion of the internal passage and is connected to the duct coming from the site having small pressure variation, means for coupling the diaphragm to the adjustment member, resilient means separate from said diaphragm for returning the adjustment member towards said first position and means for adjusting said resilient means.
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Accused Products
Abstract
A device for regulating the flow of an organic liquid between a production site and a resorption site of a patient in a drainage circuit that extends between the two sites, one of the sites being a site of small pressure variation and the other being a site of large pressure variation, particularly as a function of the position of the subject, the device comprising a valve for implanting beneath the skin and connected by a first duct to one of the sites and by a second cut to the other site, the valve comprising a body (1) defining an internal passage inter-connecting the two ducts, a member (14) for adjusting the section of said passage, and control means (7, 15) coupled to said adjustment member (14) to displace it between a first position in which the passage is closed and second positions in which the passage is opened to a controlled extent, the device being characterized in that the control means comprise a first chamber (12) formed in the body (1) and closed in sealed manner by a moving wall (7), a second chamber (6) formed in the body and separated from the first by the moving wall (7), which second chamber forms a portion (2) of the interconnecting passage and is connected to the duct (3) coming from the site having small pressure variation, means for coupling the moving wall (7) to the adjustment member (14), resilient means (17, 21) for returning the adjustment member towards its position in which it closes the interconnecting passage, and means for adjusting the magnitude of the return force.
164 Citations
16 Claims
- 1. A device for regulating the flow of an organic liquid between a production site and a resorption site of a patient in a drainage circuit that extends between the two sites, one of the sites being a site of small pressure variation and the other being a site of large pressure variation as a function of the position of the patient, the device comprising a valve for implanting beneath the skin and for connecting by a first duct to one of the sites and by a second duct to the other site, the valve comprising a body defining an internal passage interconnecting the two ducts, a member for adjusting the section of said passage, and control means coupled to said adjustment member for moving said adjustment member between a first position in which the passage is closed and second positions in which the passage is opened to a controlled extent, wherein the control means comprise a first chamber formed in the body and closed in sealed manner by a diaphragm, a second chamber formed in the body and separated from said first chamber by the diaphragm, which second chamber forms a portion of the internal passage and is connected to the duct coming from the site having small pressure variation, means for coupling the diaphragm to the adjustment member, resilient means separate from said diaphragm for returning the adjustment member towards said first position and means for adjusting said resilient means.
Specification