Closed-Loop Blood Gas Control System for Extracorporeal Perfusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing extracorporeal blood oxygenation systems face challenges in maintaining stable blood gas parameters, particularly partial pressures of oxygen and carbon dioxide, due to factors like changes in patient metabolism and oxygenator inefficiencies, which can lead to fluctuations in arterial blood gas levels.
Innovation Solution
A closed-loop control system that monitors blood gas values in an oxygenator and adjusts oxygenation gas supply parameters, such as flow rate and oxygen fraction, to maintain pre-determined levels of partial pressures of oxygen and carbon dioxide in arterial blood, using non-contact sensors and algorithms to calculate offset values for real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a closed-loop control system is implemented to maintain stable blood gas parameters, then blood gas value stability is improved, but device complexity increases
Solution Approach 1:
The patent implements a closed-loop control system that continuously monitors blood gas parameters (pO2, pCO2) and adjusts oxygenation gas supply parameters based on the monitored values. The controller receives feedback from sensors measuring actual blood gas levels and automatically modifies gas flow rate and oxygen fraction to maintain target values, thereby resolving the contradiction between stability improvement and complexity increase through automated feedback control.
Solution Approach 2:
The control system is configured to autonomously adjust oxygenation parameters without requiring continuous manual intervention. The system self-regulates by comparing monitored blood gas values with target values and automatically modifying gas supply parameters, enabling the system to maintain stability through self-service operation while reducing the need for complex manual control mechanisms.
2Speed
If real-time monitoring and adjustment of oxygenation parameters is performed, then response time to changes is improved, but device complexity increases
Solution Approach 1:
The system employs continuous real-time monitoring of blood gas parameters with immediate feedback to the controller. When deviations from target values are detected, the controller automatically adjusts oxygenation gas parameters without delay, achieving rapid response time through continuous feedback loops that bridge monitoring and adjustment functions.
Solution Approach 2:
The controller is designed to perform multiple functions including monitoring blood gas parameters, calculating required adjustments, and executing parameter modifications. This multi-functional approach consolidates monitoring and control operations into a single integrated system, improving response time while avoiding the complexity increase that would result from separate independent systems.
3Manufacturing precision
If multiple blood gas parameters are controlled simultaneously, then oxygenation management precision is improved, but device complexity increases
Solution Approach 1:
The control system simultaneously monitors multiple blood gas parameters (pO2, pCO2, and other relevant values) and adjusts corresponding oxygenation parameters based on feedback from each sensor. The controller processes multiple input signals and coordinates adjustments to maintain all target values, achieving precise multi-parameter control through integrated feedback mechanisms.
Solution Approach 2:
The system controls multiple blood gas parameters by dynamically adjusting oxygenation gas parameters including flow rate, oxygen fraction, and temperature. By changing these gas supply parameters in response to monitored blood gas levels, the system achieves precise control over multiple blood gas variables simultaneously while managing complexity through parameter-based control rather than separate control mechanisms for each parameter.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A control system controlling blood gas values in blood processed by an oxygenator, wherein the oxygenator generates arterial blood by exposing venous blood to oxygen from an oxygenation gas supply,comprises a monitoring arrangement to determine a level of the blood gas values in the arterial blood and a controller that is responsive to the monitoring arrangement and configured to control parameters of the oxygenation gas supply to the oxygenator. This allows the blood gas values to be adjusted toward a pre-determined level.