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Method and apparatus for perpendicular perforation of the cranium

  • US 4,821,716 A
  • Filed: 09/04/1987
  • Issued: 04/18/1989
  • Est. Priority Date: 09/04/1987
  • Status: Expired due to Term
First Claim
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1. An apparatus for drilling an orifice in a human cranium at an angle of substantially 90°

  • to a plane defined by a tangent to a surface portion thereof, said apparatus comprising;

    (a) hand-held means for guiding drill means upon said cranium at an angle of substantially 90°

    to a plane defined by a tangent to said cranium during the perforation thereof, said drill guiding means adapted for resting unsecured upon any portion of said cranium;

    (b) means insertable within an open bore portion of said drill guiding means for drilling an orifice in said cranium;

    (c) means for guiding a fluid transport member having a bore portion with a reduced diameter in relation to said bore of said drill guiding means and insertable within said open bore portion of said drill guiding means upon removal of said drilling means so as to effectively reduce the diameter of said open portion; and

    (d) means for preventing penetration of said drilling means beyond a predetermined distance into said cranium.

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