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Apparatus and method for determining intracranial pressure and local cerebral blood flow

  • US 4,677,985 A
  • Filed: 08/12/1985
  • Issued: 07/07/1987
  • Est. Priority Date: 08/12/1985
  • Status: Expired due to Term
First Claim
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1. An intracranial probe for measuring local cerebral blood flow and intracranial pressure comprising:

  • (a) a casing defining a generally cylindrical bore, said casing having an exterior portion for securement to the skull of a body and further including a pressure port communicating with said bore and adapted to communicate pressure to a remote pressure monitor;

    (b) a piston reciprocal in said bore;

    (c) a first platinum-containing contact plate forming at least a portion of said piston;

    (d) a second platinum-containing contact plate forming at last a portion of said piston;

    (e) first signal means coupled to said first contact plate for outputting a signal proportional to the temperature of the first plate;

    (f) second signal means coupled to said second contact plate for outputting a signal proportional to the temperature of said second plate, said first and second means adapted to be connected to comparative means;

    (g) first conductor means connected to said first plate;

    (h) second conductor means connected to said second plate, said first and second conductor means adapted to be connected to polygraph means to monitor current generated by said plates; and

    (i) means for polarizing said contact plates whereby said probe is securable in said skull with the said portions of the piston adapted to be in contact with the dura for measuring local cerebral blood flow by both thermal and hydrogen clearance techniques and means associated with said piston communicating a pressure signal indicative of intracranial pressure whereby the internal pressure is communicated across said piston to said bore to said pressure port.

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