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The Horizontal-Vertical Lumbar Valve System is an implantable device that provides controlled intraventricular pressure and cerebrospinal fluid (CSF) drainage from the lumbar subarachnoid region to the peritoneal cavity. The system minimizes overdrainage by automatically compensating for changes in CSF hydrostatic pressure when the patient changes from a recumbent to an upright position. Available in different closing pressure ranges (according horizontal and vertical orientations).