Microdialysis Probe for Continuous Glucose and Lactate Monitoring
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Solution Overview
Problem
Current medical monitoring systems for intensive care patients face delays in detecting rapid changes in indicator substances like glucose and lactate, which can lead to inadequate and delayed treatment of pathological conditions, due to invasive and time-consuming blood sampling procedures.
Innovation Solution
A continuous medical monitoring system that uses a microdialysis probe with a microdialysis membrane to invasively monitor glucose, lactate, and pyruvate levels in real-time, providing graphical displays and alarm systems for threshold values, allowing for immediate detection and proactive treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive blood sampling procedures are used to measure indicator substances, then measurement accuracy is improved, but measurement time and treatment delay increase
Solution Approach 1:
A microdialysis catheter is inserted into the patient's body in advance and left in position, with the dialysis membrane already placed at the target tissue site. This preliminary action eliminates the need for repeated invasive blood draws, allowing continuous sampling of tissue fluid through the pre-positioned catheter while maintaining measurement accuracy and reducing time loss.
Solution Approach 2:
The patent replaces the mechanical blood sampling system (needles, syringes, manual collection) with a microdialysis system that uses diffusion across a semi-permeable membrane. This substitution allows continuous passive sampling of indicator substances from tissue fluid without repeated mechanical punctures, significantly reducing measurement time while maintaining precision through the membrane's selective permeability.
2Speed
If frequent blood gas sampling is performed to detect rapid changes in indicator substances, then detection speed is improved, but patient trauma and procedural complexity increase
Solution Approach 1:
The microdialysis catheter enables continuous sampling of tissue fluid through the dialysis membrane, providing uninterrupted monitoring of indicator substances. This continuous action allows rapid detection of changes without the need for repeated discrete sampling procedures, achieving high detection speed while simplifying the overall process by eliminating the need for frequent manual interventions.
Solution Approach 2:
The dialysis membrane acts as an intermediary between the tissue fluid and the sampling system. It selectively allows indicator substances to pass from the tissue into the catheter lumen through diffusion, enabling continuous monitoring without direct contact with blood vessels. This intermediary approach simplifies the procedure by avoiding repeated arterial punctures while maintaining rapid detection capability.
3Ease of operation
If arterial catheters are used for repeated sampling, then ease of sampling is improved, but risk of complications increases
Solution Approach 1:
The microdialysis catheter is designed with a localized dialysis membrane at the tip, which performs the sampling function at a specific tissue site while the rest of the catheter remains inert. This local quality approach allows easy sampling through the membrane without requiring the entire catheter to be invasive, reducing the risk of complications such as bleeding and infection compared to arterial catheters that require large vessel access.
Solution Approach 2:
The dialysis membrane is a thin, flexible semi-permeable film that allows selective passage of indicator substances. This thin-film structure enables sampling with minimal tissue disruption, reducing the risk of complications while maintaining ease of operation. The membrane's flexibility allows it to conform to tissue without causing mechanical damage, unlike rigid arterial catheters.
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
Enables continuous, real-time monitoring of critical care patients, reducing treatment times and potentially leading to lifesaving interventions by promptly addressing changes in indicator substances, thereby improving patient outcomes.
Implementation Method 1
A continuous medical monitoring system that uses a microdialysis probe with a microdialysis membrane to invasively monitor glucose, lactate, and pyruvate levels in real-time
Data Source
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AI summary
A medical monitoring unit for continuously monitoring a glucose value and a lactate value is provided. The monitoring unit comprises: a display unit, a first unit adapted to: receive a glucose/lactate/pyruvate signal based on a measured glucose/lactate/pyruvate value, transform the glucose signal into a graphically displayable glucose/lactate/pyruvate signal, and transmit the graphically displayable glucose/lactate/pyruvate signal to the display unit of the monitoring unit, and a second unit adapted to: receive a glucose/lactate/pyruvate signal based on a measured glucose/lactate/pyruvate value,transform the glucose/lactate/pyruvate signal into a graphically displayable glucose/lactate/pyruvate signal, and transmit the graphically displayable glucose/lactate/pyruvate signal to the display unit of the monitoring unit. Furthermore, a system comprising the monitoring unit, and a sensor unit for sensing glucose and/or lactate and/or pyruvate values, is provided, as well as a method for performing the steps made possible through the provided unit and method.