Pupillometer Indexed Reflex Output for Medication-Altered Pupils
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Solution Overview
Problem
Current pupillometer systems fail to accurately assess pupillary light reflex due to variability caused by altered baseline pupil diameters from pharmacological or environmental factors, leading to misleading neurologic assessments.
Innovation Solution
A pupillometer system with a microprocessor and proprietary algorithm that normalizes pupil response to generate an indexed output resistant to changes in pupil size from opioids or ambient light, using a high-resolution infrared camera and LED light source, with software to analyze dynamic pupil responses and apply correction factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pupillometer systems measure pupil diameter directly, then the measurement process is simple, but the assessment accuracy deteriorates when baseline pupil diameter is altered by pharmacological or environmental factors
Solution Approach 1:
The patent transforms the measurement parameter from absolute pupil diameter to a normalized ratio (constriction amplitude divided by baseline diameter). This parameter transformation makes the measurement invariant to pharmacological effects that uniformly scale pupil size, thereby improving assessment accuracy without requiring complex hardware modifications
Solution Approach 2:
The patent combines multiple measurement components (baseline diameter, constriction amplitude, latency) into a composite indexed output that represents pupillary reactivity. This composite metric integrates multiple aspects of pupil response to create a robust assessment that compensates for baseline variations caused by opioids or ambient light
2Reliability
If pupillometer systems use standardized pupil diameter thresholds, then the device operation is simple, but the reliability deteriorates in patients with pharmacologically altered baseline pupil size
Solution Approach 1:
The system incorporates feedback by using the measured baseline pupil diameter to dynamically adjust the assessment criteria. The normalized index provides feedback that is automatically adjusted to the patient's baseline state, allowing reliable interpretation without requiring clinicians to manually adjust thresholds for each patient's medication status
Solution Approach 2:
The pupillometer system performs self-adjustment by automatically normalizing measurements to each patient's baseline pupil size. This self-service capability eliminates the need for external calibration or manual adjustment by the operator, maintaining ease of operation while improving reliability across different medication states
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides consistent and accurate neurological assessments by compensating for pupil size variations, ensuring reliable evaluation of pupillary reactivity in clinical settings.
Implementation Method 1
a camera, a light source, a display, and a microprocessor executing an algorithm that evaluates pupil response to light stimulation
Implementation Method 2
Pupillometer with indexed light reflext output immune to medication-induced pupillary condition
Implementation Method 3
a light source... LED light source
Data Source
AI summary
A pupillometer comprising a camera, a light source, a display, and a microprocessor configured with an algorithm to generate an indexed output representing pupillary light reflex reactivity. The indexed output is substantially invariant to changes in baseline pupil size caused by pharmacologic agents such as opioids or by ambient lighting variations, thereby providing a robust and reliable measure of neurologic function across a wide range of clinical conditions.