Hematocrit Analyzer Motion Compensation via Accelerometer Feedback

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Solution Overview

Problem

Point-of-care analyte testing systems face challenges with motion and device impact errors due to their portable and handheld nature, leading to potential inaccuracies in blood or fluid analysis, especially when operated by untrained individuals.

Innovation Solution

A portable clinical system that includes a hematocrit sensor and analyzer with a computing device capable of determining spatial orientation and motion, providing alerts or correcting results if they exceed threshold values, and using accelerometers to measure static acceleration on multiple axes to ensure proper positioning and stability during testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If point-of-care analyte testing systems are made portable and handheld for immediate testing, then speed and accessibility of testing are improved, but the system becomes susceptible to motion and device impact errors that compromise measurement precision

Engineering Contradiction:

Improvetesting speedVSAvoidmeasurement precision

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The system performs preliminary detection of motion and orientation conditions before the actual hematocrit measurement is completed. The accelerometer continuously monitors device orientation and motion during the test cycle, allowing the system to identify problematic conditions early and apply corrections or flags to the results before final reporting.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by using accelerometer data to monitor device orientation and motion in real-time during testing. When motion or orientation exceeds predetermined thresholds, the system provides feedback through alerts, warnings, or result suppression, enabling users to correct positioning or repeat the test to ensure measurement accuracy.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If the analyzer is made portable for point-of-care use, then ease of operation and accessibility are improved, but the system becomes vulnerable to motion and impact that reduces reliability

Engineering Contradiction:

Improveease of operationVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system provides self-service by automatically monitoring its own operational conditions through the accelerometer. The device independently detects motion and orientation issues, compares readings against thresholds, and takes autonomous actions such as displaying alerts, suppressing results, or triggering warnings without requiring external monitoring or intervention.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

3Measurement precision

If motion detection and correction features are added to the analyzer, then measurement precision and reliability are improved, but device complexity increases

Engineering Contradiction:

Improvemeasurement precisionVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical stabilization mechanisms with an electronic sensor-based approach. Instead of using mechanical gimbals, active vibration cancellation, or precision mounting systems, the invention uses an accelerometer coupled with software algorithms to detect and compensate for motion effects, significantly reducing mechanical complexity while maintaining measurement precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system changes the operational parameters of the measurement process based on detected motion and orientation conditions. By dynamically adjusting thresholds, applying correction factors, or modifying test execution based on accelerometer data, the system maintains measurement precision without requiring complex physical stabilization mechanisms.

Inventive Principle:

Principle #35Parameter changes

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

The system enhances the accuracy and reliability of point-of-care analyte testing by minimizing the impact of motion and device orientation errors, ensuring reliable results even in untrained hands and dynamic environments.

Implementation Method 1

a test device comprising a hematocrit sensor

Methodology Applied

Scientific EffectOptical absorption: Absorption (EM radiation)

Implementation Method 2

using accelerometers to measure static acceleration on multiple axes

Methodology Applied

Scientific EffectAcceleration: Accelerometer

Data Source

PatentUS10188327B2Portable clinical analysis system for hematocrit measurement

Publication Date: 2019.01.29 ABBOTT POINT OF CARE INC

AI summary

The present invention covers the integration and utility of accelerometer features into a clinical analysis system. For example, measurement of dynamic acceleration and orientation of a blood-testing instrument with respect to Earth's gravitational field may be used to determine reliability of a test procedure and optionally to provide corrective elements thereof.