Involuntary Reflex Cough Test for Neurological Diagnosis

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Solution Overview

Problem

Current diagnostic tests for urinary incontinence, such as the Valsalva maneuver, require patients to generate forceful abdominal contractions or coughs, which some patients cannot perform due to neurological deficiencies or embarrassment, leading to inadequate diagnosis.

Innovation Solution

An involuntary reflex cough test is induced to activate the nucleus ambiguus and medial motor cell column, stimulating paraspinal muscles and measuring electromyogram (EMG) signals and intra-abdominal pressure (IAP) to diagnose neurological deficiencies and urinary incontinence, using a system with a handheld device and catheter for bladder filling and pressure monitoring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional diagnostic tests (Valsalva maneuver, voluntary cough) are used, then patient cooperation and active participation are required, but patients with neurological deficiencies or embarrassment cannot perform these tests, leading to inadequate diagnosis

Engineering Contradiction:

Improvediagnostic accuracyVSAvoidpatient cooperation requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system uses involuntary reflex cough induced by chemical stimulus (tartaric acid nebulization) to activate the nucleus ambiguus and medial motor cell column, stimulating paraspinal muscles without requiring patient volition. The patient's own physiological reflex serves the diagnostic purpose, eliminating the need for cooperative effort while maintaining diagnostic reliability for detecting urinary incontinence and neurological deficiencies

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

A chemical intermediary (tartaric acid nebulized solution) is introduced to trigger the involuntary cough reflex. This mediator activates the neural pathway (nucleus ambiguus → medial motor cell column → paraspinal muscles) that naturally produces cough, bypassing the need for voluntary patient action while still generating the necessary intra-abdominal pressure for diagnostic purposes

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stress or pressure

If forceful abdominal contractions are required for testing, then intra-abdominal pressure can be effectively measured, but patients unable to generate such contractions cannot be properly diagnosed

Engineering Contradiction:

Improveintra-abdominal pressureVSAvoidapplicability to neurologically impaired patients

Core Design Contradiction:

Stress or pressureVSAdaptability or versatility

Solution Approach 1:

Instead of asking patients to voluntarily contract abdominal muscles to generate pressure, the system inverts the approach by using chemical stimulation to trigger an involuntary reflex that automatically produces the required intra-abdominal pressure. The pressure generation becomes a passive physiological response rather than an active patient effort, making the test applicable to neurologically impaired patients who cannot voluntarily contract muscles

Inventive Principle:

Principle #13The other way round (Inversion)

3Measurement precision

If voluntary cough is used for diagnosis, then patient effort can be monitored, but insufficient cough strength leads to incorrect diagnosis

Engineering Contradiction:

Improvecough strength measurementVSAvoiddiagnostic correctness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system eliminates the variability of patient effort by using the patient's own involuntary reflex cough mechanism. The chemically-induced reflex automatically generates consistent cough strength through the neural pathway (nucleus ambiguus → medial motor cell column), removing the uncertainty of voluntary cough strength and ensuring reliable diagnostic measurements without requiring patient effort monitoring

Inventive Principle:

Principle #25Self-service

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

This method allows for objective diagnosis of neurological deficiencies and urinary incontinence without patient cooperation, providing a quantitative measure of intra-abdominal pressure and bladder functionality, improving diagnostic accuracy and applicability for patients unable to perform traditional tests.

Implementation Method 1

An involuntary reflex cough test is induced to activate the nucleus ambiguus and medial motor cell column, stimulating paraspinal muscles

Methodology Applied

Scientific EffectReflex arc:

Implementation Method 2

measuring electromyogram (EMG) signals and intra-abdominal pressure (IAP)

Methodology Applied

Scientific EffectElectromyography:

Implementation Method 3

providing a quantitative measure of intra-abdominal pressure

Methodology Applied

Scientific EffectPressure measurement:

Data Source

PatentUS8840550B2Involuntary contraction induced pressure as a medical diagnostic tool using involuntary reflex cough test

Publication Date: 2014.09.23 PNEUMOFLEX SYST LLC

AI summary

A system and method allows diagnosis of a patient for physiological abnormality such as a neurological deficiency. An involuntary reflex cough event is induced within the patient that activates the nucleus ambiguus and medial motor cell column of the patient and stimulates involuntary cough activated paraspinal muscles in the pelvis of the patient. An electromyogram (EMG) is obtained from the involuntary cough activated paraspinal muscles while inducing involuntary reflex cough and determining its duration. The intra-abdominal pressure (IAP) is determined and the IAP is correlated with the EMG duration of the involuntary cough event within a processing device to diagnose a physiological abnormality such as a neurological deficiency within the patient.