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Intercranial pressure transducer

  • US 4,014,319 A
  • Filed: 02/28/1975
  • Issued: 03/29/1977
  • Est. Priority Date: 03/07/1974
  • Status: Expired due to Term
First Claim
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1. An intercranial pressure transducer of the passive type, including:

  • a sealed capsule adapted to be housed in the thickness of a skull;

    a movable permanent magnet within said capsule;

    guide means for guiding displacement of said magnet axially within said capsule; and

    said capsule including means for subjecting said magnet to a hydrostatic force generated by the intercranial pressure within said skull, whereby said magnet is displaceable by an external magnetic field applied thereto and which is sufficiently strong to overcome said hydrostatic force applied to said magnet and whereby the strength of the external magnetic field required to displace said magnet is a measure of said intercranial pressure.

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