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Method of and apparatus for determining very accurately the position of a device inside biological tissue

  • US 4,431,005 A
  • Filed: 05/07/1981
  • Issued: 02/14/1984
  • Est. Priority Date: 05/07/1981
  • Status: Expired due to Term
First Claim
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1. A method for determining accurately the position of a device inside biological tissue comprising:

  • placing magnetically permeable metal on the device to be detectedcreating a balanced field by means of a probe, said field becoming disturbed when metal having magnetic permeability is disposed within said field,directing said probe towards the biological tissue containing the device so that a portion of the field penetrates a surface area of the biological tissue,scanning said probe until said field becomes disturbed,generating a signal by a circuit attached to said probe when said field becomes disturbed, andmarking the surface of the biological tissue beneath which said field becomes disturbed by moving a removable slide on said probe to the tissue surface area where said field becomes disturbed while said probe is in place, removing said probe while holding said slide on the surface area, and marking the surface area using said slide as a guide.

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