Electricity: measuring and testing – Magnetic – Displacement
Patent
1989-03-24
1990-07-24
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
128737, 324225, 324233, 324239, G01B 714, G01V 310, A61B 506, G01N 2772
Patent
active
049437704
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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Cullen et al., "A New Method of Positioning Endotracheal Tubes", Anesthesiology, vol. 43, No. 5, Nov. 1975, pp. 596-599.
Ashley-Rollman Charles
McCormick William
O'Donnell Miles C.
McCormick Laboratories, Inc.
Strecker Gerard R.
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