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Adjustable implantable valve having non-invasive position indicator

  • US 4,676,772 A
  • Filed: 12/23/1985
  • Issued: 06/30/1987
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Term
First Claim
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1. A system for controlling the pressure of cerebrospinal fluid, comprising:

  • an implantable fluid pressure relief valve having a housing, an adjustment member for setting the opening pressure threshold of said valve, a rotatable magnetic wrench means for adjusting said adjustment member, said relief valve also having means for limiting rotation of said magnetic wrench means to less than 360 degrees when said valve is in an implanted position; and

    magnetic indicator means responsive to the position of said magnetic member for non-invasively indicating the position of said magnetic member to indicate the pressure threshold of said valve.

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