Method of and apparatus for determining very accurately the position of a device inside biological tissue
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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Abstract
A method of and apparatus for determining very accurately the position of a device inside biological tissue comprising a detecting instrument with a probe, which probe generates a small magnetic field which can be disturbed by a magnetically permeable metal in the device inside the tissue when a narrow end of the probe is positioned immediately adjacent to tissue containing the metal, whereby after the metal-carrying device is inserted in the tissue, the end of the probe is used to precisely locate the device by scanning the tissue until the magnetic field is disturbed which causes the instrument to emit a signal.
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Citations
9 Claims
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1. A method for determining accurately the position of a device inside biological tissue comprising:
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placing magnetically permeable metal on the device to be detected creating 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, and marking 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. - View Dependent Claims (2, 3, 4)
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5. An improved apparatus for determining accurately the position of a device inside biological tissue, the apparatus having a means for generating a balanced field, means for detecting when the field is disturbed, said field being disturbed by the presence of the device in said field, and a circuit means for driving said field-generating means and generates a signal when said field is disturbed, wherein the improvement comprises:
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a probe, said probe containing said field-generating means and said field detecting means, and, a means for marking the surface of the biological tissue beneath which said field becomes disturbed, said means for marking comprising a movable slide which fits around said probe, said slide being movable along said probe and onto the adjacent tissue, so that when said probe is removed said slide acts as a guide for marking the tissue area. - View Dependent Claims (6, 7, 8, 9)
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Specification