| 摘要 |
<p>1434107 Valves S HAKIM 2 Aug 1973 [14 Aug 1973] 36863/73 Heading F2V [Also in Divisions A5-A6] A ventricular shunt system for draining cerebo-spinal fluid includes a catheter 50, air valve assembly 60 and means for controlling the opening of the valve in response to different fluid pressures. A sensing bladder 24 for location between the brain 68 and skull 54, is connected by a tube to a valve bladder 22 to form a sensing system filled with a radioopaque oil, e.g. ethyl-indophenyl undophenyl undecylate. The bladder 22 acts between the valve body 12 and a plate 20, hinged at a point 23, which carries a spring 18 biasing a ball valve member 16 on to its seating 15; so that expansion of the bladder 22 reduces the biasing force as pressure by the skull increases. A preloading spring 21 maintains plate to bladder contact. In a modification, the control force is applied to plate 20 by a sensing button (80), Fig. 4 (not shown), in contact with the exterior of the brain. The valve body may be attached to the skull by a mounting pin (90) and screws (92), Fig. 5 (not shown). A modified valve comprises a resilient closed tube 70, Fig. 3, having a longitudinal slot 72 which opens under the control of a bladder 22a in the tube and in hydraulic communication with the sensing bladder 24. In a further modification, a resilient chamber 102, Fig. 6, is for direct location between the brain and skull. Where force applied to it by the brain is transmitted to a closed resilient tube 100 to open a slit 108. The valve housing, body, springs and plate are of stainless steel. The spherical member is synthetic sapphire and the bladders are silicone rubber discs cemented together by silicone cement or polymerized by ionizing radiation and connected by silicone tubing.</p> |
