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Apparatus and method for penetration with shaft having a sensor for sensing penetration depth

  • US 20020042594A1
  • Filed: 11/06/2001
  • Published: 04/11/2002
  • Est. Priority Date: 03/30/1998
  • Status: Active Grant
First Claim
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1. An apparatus having a shaft for penetrating into an object which has impedance that varies according to the depth under a surface of the object, comprising:

  • a shaft comprising;

    (i) a shaft body with a tip for penetration; and

    (ii) first and second conductive ends proximate to the tip such that a change of impedance of material of the object between the conductive ends can be sensed to provide information on the depth of penetration.

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