Lactate Sensor Fluid Management with Bidirectional Pumping
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Solution Overview
Problem
Current commercially available devices are unable to economically monitor patient trend lactate values in near real-time over an extended period, which is crucial for critical care settings where timely lactate monitoring can be life-saving.
Innovation Solution
A fluid management system with a pumping mechanism, check valve, reservoir, tubing, and sensor arrangement that enables either ex vivo or in vivo lactate monitoring, featuring a disposable set assembly for low-cost injection molding and ultrasonic or laser welding, allowing for bidirectional fluid flow without internal valves, using calibration fluid and anticoagulant to ensure accurate and continuous lactate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clinical laboratories use automated systems for high-volume testing, then testing accuracy and quality control are improved, but immediate test results cannot be provided for trauma and multi organ dysfunction patients
Solution Approach 1:
The system divides the testing function into two separate locations: centralized clinical laboratories for high-volume batch processing and point-of-care devices for immediate bedside testing. This segmentation allows both high accuracy through centralized automation and immediate results through distributed POC testing to simultaneously satisfy both requirements
Solution Approach 2:
Point-of-care testing devices serve as an intermediary between the patient and the centralized clinical laboratory. These POC devices can perform rapid testing at the bedside while still maintaining quality control through connection to the laboratory's information system, providing immediate results without sacrificing accuracy
2Object-affected harmful factors
If ex vivo POC systems use closed systems to minimize blood contact, then patient safety is improved, but blood identification and transport errors still occur
Solution Approach 1:
The system implements feedback loops where test results and patient information are automatically transmitted back to the centralized laboratory information system. This ensures that blood samples are correctly identified and tracked throughout the testing process, preventing identification errors while maintaining the safety benefits of closed ex vivo systems
Solution Approach 2:
The POC testing system acts as an intermediary that maintains closed blood handling for safety while using information system integration as a mediator to ensure accurate blood identification and transport tracking, eliminating errors through automated data exchange
3Speed
If in vivo sensors are developed for real-time monitoring, then immediate patient monitoring capability is improved, but technical hurdles prevent common commercial use
Solution Approach 1:
The system employs disposable POC testing devices that are used for immediate bedside testing and then discarded. This approach provides real-time monitoring capability without the reliability issues of reusable in vivo sensors, as each disposable device is factory-calibrated and designed for single-use, eliminating calibration drift and contamination problems
Solution Approach 2:
The system replaces complex in vivo mechanical sensors with simpler ex vivo chemical and optical sensing methods. This substitution maintains real-time monitoring capability while avoiding the technical hurdles of in vivo sensor stability, as the simpler ex vivo systems do not suffer from the same calibration and contamination issues
4Adaptability or versatility
If operator-performed POC tests are used at the bedside, then diagnostic flexibility is improved, but quality control errors due to operator mistakes increase
Solution Approach 1:
The system implements automated feedback mechanisms where the POC device automatically transmits test results and quality control data to the centralized laboratory information system. This feedback loop ensures that operator-performed tests maintain consistent quality control while preserving diagnostic flexibility, as the automation handles quality assurance without restricting operator choice
Solution Approach 2:
The POC testing system performs self-service quality control functions automatically, including sample validation, calibration verification, and result verification. This allows operator-performed tests to maintain diagnostic flexibility while eliminating quality control errors through automated self-verification processes
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 provides continuous, accurate lactate monitoring with inherent safety features, reduced costs, and simplified setup, facilitating real-time data acquisition and storage, thereby enhancing patient management and reducing mortality rates in critical care scenarios.
Implementation Method 1
a pumping mechanism, a check valve, a reservoir, tubing, a sensor, and connective means for enabling either ex vivo or in vivo lactate monitoring
Implementation Method 2
A second cycle in the opposite or 'pull' direction causes a patient blood sample to be drawn over the sensor arrangement, where the blood analysis is taken, and wherein a check valve provides the directional control of the fluid
Implementation Method 3
POC diagnostic test systems include electrochemical biosensors, optical fluorescence sensors
Data Source
AI summary
A lactate sensor arrangement includes a catheter for withdrawing a test fluid sample, a sensor module for measuring an analyte such as lactate in the sample, and a pumping mechanism. A single uninterrupted flow path extends between the pumping mechanism and the catheter and within the flow path resides a sensor module containing a test chamber. The sensor arrangement also includes a control unit or controller that interfaces with a pumping mechanism driver. The sensor arrangement also includes a source of sensor calibration and anticoagulant solution, such as a reservoir, which has a silicone rubber fill septum, a non-woven Teflon air vent, and a check valve sub-assembly.