Medical monitor with failure protection
First Claim
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1. An apparatus comprises:
- a. monitoring means for monitoring respiration of a patient, said monitoring means comprising;
i. generating means for generating a carrier signal;
ii. applying means coupled to said generating means for applying said carrier signal across the thorax of said patient;
iii. measuring means coupled to said applying means for measuring changes in said carrier signal as applied across said thorax of said patient;
b. sensing means responsively coupled to said monitoring means for sensing the presence of non-physiologically induced electromagnetic interference which may render said monitoring means inaccurate, said sensing means comprising;
i. interrupting means for interrupting said applying means during a quiet period; and
ii. determining means for determining the presence of a substantial non-physiologically induced electromagnetic interference during said quiet period.
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Abstract
An apparatus for and method of monitoring respiration of a patient using impedance changes of the body to indicate respiration events. The impedance changes are measured by applying a carrier signal across the thorax of the patient. The carrier is periodically interrupted to produce a quiet period. A first level detector assumes the presence of EMI if the signal present during the quiet period exceeds a predetermined threshold. A second level detector senses the presence of substantial high frequency EMI. At initial power up, a third level detector checks for presence of signal before the carrier drive is applied. A fourth test circuit checks for the hang up of the differential amplification circuit.
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Citations
7 Claims
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1. An apparatus comprises:
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a. monitoring means for monitoring respiration of a patient, said monitoring means comprising; i. generating means for generating a carrier signal; ii. applying means coupled to said generating means for applying said carrier signal across the thorax of said patient; iii. measuring means coupled to said applying means for measuring changes in said carrier signal as applied across said thorax of said patient; b. sensing means responsively coupled to said monitoring means for sensing the presence of non-physiologically induced electromagnetic interference which may render said monitoring means inaccurate, said sensing means comprising; i. interrupting means for interrupting said applying means during a quiet period; and ii. determining means for determining the presence of a substantial non-physiologically induced electromagnetic interference during said quiet period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification