INTERFERENCE DETECTOR FOR PATIENT MONITOR
First Claim
1. A system for detecting interference in a measurement device, the system comprising:
- a process configured to determine a level of environmental interference in a measurement device; and
a display for audio or visual indication of the level of environmental interference.
3 Assignments
0 Petitions
Accused Products
Abstract
A system is disclosed for detecting and calculating the level of ambient and/or environmental noise, such as electromagnetic interference generated by electric power lines, ambient lights, light dimmers, television or computer displays, power supplies or transformers, and medical equipment. In some embodiments, the system performs frequency analysis on the interference signal detected by light photodetectors and determines the power of the interference signal concentrated in the analyzed frequency bands. The worst-case interference level can be determined by selecting the maximum from the computed power values. In some embodiments, the determined interference signal power can be compared with the noise tolerance of a patient monitoring system configured to reliably and non-invasively detect physiological parameters of a user. The results of the comparison can be presented to the user audio-visually. In some embodiments, the system can be used to perform spot check measurements of electromagnetic interference.
109 Citations
20 Claims
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1. A system for detecting interference in a measurement device, the system comprising:
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a process configured to determine a level of environmental interference in a measurement device; and a display for audio or visual indication of the level of environmental interference. - View Dependent Claims (2, 3)
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- 4. A noninvasive monitor that receives one or more sensor signals responsive to light attenuated by tissue of a monitored patient and processes the sensor signals to determine measurement values for one or more physiological parameters of said monitored patient, the sensor including a light source and one or more detectors housed in a sensor housing that positions the light source and said detector proximate said tissue, the monitor including a signal processor that determines an amount of ambient electronic interference proximate said sensor, and at least one of an audio or visual indication perceptible by a caregiver of said amount of said interference.
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16. A method of determining whether a sensitive instrument will have difficulty determining accurate measurements of physiological parameters of a patient, the method comprising:
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selecting an interference detection mode on a patient monitor, said patient monitor configured to receive from a sensor one or more sensor signals responsive to light attenuated by tissue of a monitored patient and process the sensor signals to determine measurement values for one or more physiological parameters of said monitored patient, the sensor including a light source and one or more detectors housed in a sensor housing that positions the light source and said detector proximate said tissue; electronically determining with said signal processor an amount of ambient electronic interference proximate said sensor; and electronically outputting at least one of an audio or visual indication perceptible by a caregiver of said amount of said interference. - View Dependent Claims (17, 18, 19, 20)
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Specification