System for detecting potential probe malfunction conditions in a pulse oximeter
First Claim
1. A method for use in a pulse oximeter, comprising the steps of:
- providing a photoactive element for providing electrical signals responsive to optical signals incident thereon;
applying an optical signal to said photoactive element;
detecting a first signal associated with an input lead of said photoactive element; and
detecting a second signal associated with an output lead of said photoactive element; and
analyzing said detected first and second signals to obtain information regarding said photoactive element for use in controlling operation of said pulse oximeter in connection with a probe including said photoactive element.
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Accused Products
Abstract
An initialization module in a pulse oximeter accommodates a variety of different probes and a variety of operating parameters as well as providing for interrogation of various probe circuits for detection of probe faults. Probe fault detection for the red and infrared LED circuits of the probe is implemented using an adaptive algorithm that is dependent on the drive settings or signals applied to the LED circuits. A configurable circuit is used to provide multiple initialization values relating to a calibration circuit of the probe for improved fault detection. Additionally, potential faults with respect to the photodetector circuit of a probe are identified based on monitoring drawn by an output by the photodetector.
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Citations
14 Claims
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1. A method for use in a pulse oximeter, comprising the steps of:
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providing a photoactive element for providing electrical signals responsive to optical signals incident thereon; applying an optical signal to said photoactive element; detecting a first signal associated with an input lead of said photoactive element; and detecting a second signal associated with an output lead of said photoactive element; and analyzing said detected first and second signals to obtain information regarding said photoactive element for use in controlling operation of said pulse oximeter in connection with a probe including said photoactive element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for use in a pulse oximeter comprising:
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at least one source for generating optical signals; a photoactive element for providing electrical signals responsive to optical signals incident thereon; an input module for measuring an input signal drawn into said photoactive element in response to said optical signals; and an output module for measuring an output signal output from said photoactive element in response to said optical signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification