Variable Mode Pulse Indicator for Oximeter Signal Distortion
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Solution Overview
Problem
Oximeter systems face challenges in accurately indicating pulse occurrences during signal distortion, high noise, or low signal quality, leading to potential misinterpretations by caregivers, as they rely on assumptions based on the system's responses, which may not accurately reflect the patient's condition.
Innovation Solution
A variable mode oximetry pulse indicator that allows caregivers to configure audio and visual pulse occurrence indications, enabling them to select modes that suit their expectations, such as disabling or modifying indicators during challenging signal conditions, using user-configurable menus and input devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oximeter attempts to determine pulse occurrences during high-noise or distortion situations, then pulse indication is provided during challenging signal conditions, but the accuracy and reliability of the pulse indication deteriorates
Solution Approach 1:
The system dynamically adjusts the pulse indication behavior based on signal quality conditions. When signal quality is good, the system provides pulse indications based on actual detected pulses. When signal quality deteriorates (high noise or distortion), the system modifies its indication behavior to avoid providing potentially inaccurate pulse indications, thus maintaining reliability while adapting productivity to conditions.
Solution Approach 2:
The system changes the operational parameters of the pulse indicator based on signal quality. By monitoring signal quality metrics and adjusting the indication threshold or enablement state accordingly, the system optimizes the balance between providing pulse indications and maintaining their accuracy across varying signal conditions.
2Reliability
If the oximeter disables pulse indications during signal distortion, then the reliability of pulse indications is maintained, but the productivity and information availability deteriorates
Solution Approach 1:
The system dynamically switches between different operational modes based on signal quality. Rather than permanently disabling pulse indications during distortion, the system adapts its behavior in real-time, enabling indications when conditions permit and disabling or modifying them when conditions deteriorate, thus maintaining reliability without permanently sacrificing productivity.
Solution Approach 2:
The pulse indication system monitors its own operating conditions (signal quality) and automatically adjusts its behavior accordingly. This self-regulating mechanism ensures that the system maintains reliable operation by disabling indications only when necessary, while restoring them when conditions improve, without requiring external intervention.
3Productivity
If the oximeter provides pulse indications during all conditions, then the productivity and information availability is maximized, but the loss of information increases due to potential misinterpretation
Solution Approach 1:
The system incorporates feedback about signal quality into the pulse indication decision process. By continuously monitoring signal quality metrics and using this information to modulate the pulse indication output, the system provides feedback that helps caregivers interpret the reliability of the displayed pulse information, reducing misinterpretation while maintaining information availability.
Solution Approach 2:
The signal quality indicator acts as an intermediary between the raw pulse detection system and the caregiver. This intermediary provides contextual information about the reliability of pulse indications, allowing the system to maintain high productivity while preventing loss of information through misinterpretation by enabling caregivers to assess the trustworthiness of the displayed data.
Data Source
AI summary
A user configurable variable mode pulse indicator provides a user the ability to influence outputs indicative of a pulse occurrence at least during distortion, or high-noise events. For example, when configured to provide or trigger pulse indication outputs, a pulse indicator designates the occurrence of each pulse in a pulse oximeter-derived photo-plethysmograph waveform, through waveform analysis or some statistical measure of the pulse rate, such as an averaged pulse rate. When the configured to block outputs or not trigger pulse indication outputs, a pulse indicator disables the output for one or more of an audio or visual pulse occurrence indication. The outputs can be used to initiate an audible tone “beep” or a visual pulse indication on a display, such as a vertical spike on a horizontal trace or a corresponding indication on a bar display. The amplitude output is used to indicate data integrity and corresponding confidence in the computed values of saturation and pulse rate. The amplitude output can vary a characteristic of the pulse indicator, such as beep volume or frequency or the height of the visual display spike.