Device for accurately detecting the position of a ferromagnetic material inside biological tissue
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United States of America Patent
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Jul 24, 1990
Issued Date -
N/A
app pub date -
Mar 24, 1989
filing date -
Apr 21, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for accurately detecting and monitoring the position of an object inside biological tissue, particularly an endotracheal tube inside a patient's throat, comprising a circuit which generates an electromagnetic field of limited width and depth, and which is disturbed by the presence of material having a high magnetic permeability such as a metal band on the distal end of such an endotracheal tube, but which is otherwise stable and not affected by temperature or other such factors. Included in the invention is a probe for generating the electromagnetic field, which probe is insensitive to temperature changes.
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