ECMO Temperature Control Using Gas Exchange Feedback

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Solution Overview

Problem

Existing patient body temperature control during extracorporeal membrane oxygenation (ECMO) and mechanical ventilation is challenging due to difficulties in detecting and managing fever or hypothermia, leading to discomfort and increased metabolic demand, which can strain the cardiovascular and pulmonary systems.

Innovation Solution

A method and system for automatically controlling patient body temperature by monitoring gas exchange changes in response to temperature adjustments, allowing for optimal temperature maintenance or adjustment based on detected gas exchange variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If external heating is applied to maintain patient body temperature during ECMO treatment, then the patient's body temperature is maintained at normal levels, but the ability to detect and respond to fever is lost and the patient experiences discomfort when the body temperature set point shifts

Engineering Contradiction:

Improvepatient body temperatureVSAvoiddetection of fever and patient comfort

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The system continuously monitors gas exchange parameters (CO2 removal, O2 uptake) and uses this feedback to detect changes in the patient's body temperature set point. When the patient develops fever, the increased metabolic rate causes detectable changes in gas exchange, allowing the system to alert clinicians to temperature set point shifts even while external heating maintains normal body temperature.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system uses gas exchange measurements as an intermediary indicator to indirectly detect changes in body temperature set point. Rather than directly measuring the set point or relying on patient sensation, the system monitors the metabolic consequences (gas exchange changes) that occur when the set point shifts, providing an objective measure of patient thermal state.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If the patient's body temperature is manually adjusted during treatment, then optimal temperature control may be achieved, but the complexity of temperature management increases and requires continuous clinician intervention

Engineering Contradiction:

Improvepatient body temperature controlVSAvoidtemperature control management

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The system automatically detects changes in the patient's body temperature set point through gas exchange monitoring and provides alerts or automated adjustments to maintain optimal temperature. This self-monitoring capability reduces the burden on clinicians to continuously manually assess and adjust temperature, while still achieving optimal temperature control.

Inventive Principle:

Principle #25Self-service

3Temperature

If external heating overrides the patient's own temperature control to maintain normal body temperature, then the patient remains at normal temperature, but the patient experiences significant discomfort when the body temperature set point shifts up or down

Engineering Contradiction:

Improvepatient body temperatureVSAvoidpatient discomfort

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The system provides continuous feedback on the patient's thermal state through gas exchange monitoring, enabling timely detection of set point shifts. This allows clinicians to adjust external heating parameters to match the patient's new set point, preventing the discomfort that would otherwise result from maintaining a fixed temperature that no longer matches the patient's physiological needs.

Inventive Principle:

Principle #23Feedback

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

Enhances patient comfort by maintaining optimal body temperature, reducing metabolic strain, and providing clinical insight into potential temperature-related changes.

Implementation Method 1

allowing gas exchange between the blood and the sweep gas to take place over the oxygenator membrane

Methodology Applied

Scientific EffectGas exchange: Diffusion

Implementation Method 2

During ECMO treatment, the blood in the extracorporeal circuit is heated to compensate for the energy losses from the extracorporeal circulation of blood

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS20250345499A1Patient body temperature control during gas exchange treatment

Publication Date: 2025.11.13 MAQUET CRITICAL CARE

AI summary

A method is for patient body temperature control during gas exchange treatment of a patient, such as extracorporeal membrane oxygenator [ECMO] treatment provided by an ECMO device and/or respiratory treatment provided by a mechanical ventilator. The method comprises the steps of determining a gas exchange being at least one of a carbon dioxide [CO2] exchange and an oxygen [O2] exchange between an oxygen-containing gas and blood of the patient; inducing a change in temperature of the patient; detecting a change in the gas exchange following the change in the temperature of the patient, and automatically controlling the temperature of the patient based on the detected change in gas exchange, and/or presenting a recommendation for manual adjustment of the temperature of the patient to a user, based on the detected change in gas exchange.