Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1995-04-26
1997-08-26
Rivell, John
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13750513, 1375121, 137844, 137845, 604 9, 604247, F16K 3136, A61M 2700
Patent
active
056602006
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a double-valved variable pressure device for hydrocephaly. More particularly, the present invention relates to technical and functional improvements to the operation of a valve for hydrocephaly used under medical conditions demanding the removal of cephalo-rachidian liquid out of the central nervous system in an attempt to maintain a stable and proper intracranial pressure.
As is already known by specialists in this area, there are currently numerous types of apparatus for the above-referenced purpose. In most cases, these devices have only one valved element and, accordingly, the control of outflow and cephalo-rachidian liquid pressure are solely and exclusively dependent on the perfect operation of only one valve. This type of apparatus has several disadvantages such as: a) the proper relationship between the volume of drained liquid and the intracranial pressure is not managed; and b) these devices produce the phenomenon of hyperdrainage (the siphon effect), with important medical complications that are described in the literature.
SUMMARY OF THE INVENTION
The present invention provides for a double-valved variable pressure device for overcoming the aforementioned disadvantages. The present invention achieves the cephalo-rachidian pressure and the outflow control by two valves implementing a new operational concept. The first valvular element determines the system's outflow until a given "minor" pressure (i.e., the intracranial pressure) propagated by means of the liquid means into the device, exerting a closing force on the first valve. Accordingly, the higher the pressure at this part of the device, the more the valve will be closed, until it is fully closed. At this time the intracranial pressure is released through a second valve that, similar to the first valve, permits the liquid to be properly drained and, this "higher" pressure being stopped, the second valve will automatically close while the first valve returns to its former "open" state and the cycle is once again repeated. This double-valved operation lends itself to a number of technical and practical advantages, among which are: a) no hyperdrainage phenomenon is allowed; b) the outflow permitted by the system is directly related to the intracranial pressure the patient is submitted to; c) the system is continuously self-adjustable by means of two valves; and d) the cephalo-rachidian liquid pressure and outflow do not depend on just one valve system, but rather on two balanced systems, which make possible a more precise and proper control for each patient.
The present invention will be best understood by reference to the detailed description made below in conjunction with the attached drawing.
BRIEF DESCRIPTION OF THE DRAWING
The attached drawing illustrates a perspective cutaway view showing the internal and external details of the present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
As shown in the figure and its details, this double-valved variable pressure device for hydrocephaly consists of a frame in the shape of a capsule 1 constructed of a non-deformable material, substantially in vertical cylindrical shape, with sloped ends ending in upper coupling sectors and lower sectors 4 appropriate for the connection of a proximal 5 and distal 4 catheter. The proximal and distal catheters constitute the input and output for the cephalo-rachidian liquid through the body or capsule 1. The body or capsule 1 is internally provided with two annular sectors, a lower 7 one and upper 8 one. Both of the annular sectors 7, 8 are made of a rigid and undeformable material. The lower sector 7 forms a waterproof closing through a flange 9 and has its outer diameter integrated into the capsule wall 1. The inner diameter of the lower sector 7 is integrated with an upward vertical tubular short sector 10 that, in turn, is coaxially aligned with another similar sector with a smaller diameter 11. The other similar sector with a smaller diameter 11 is also integrated to a flange 12, alt
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Phoenix Biomedical Corporation
Rivell John
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