Dynamic Pressure Response System for Residual Fluid Measurement
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Solution Overview
Problem
Current methods for measuring fluid output in critical care patients, such as urine output, are inaccurate due to fluid accumulation in dependent loops of drainage tubes, which can lead to pressure spikes and reflux when clinicians manually manipulate the tubing to obtain measurements.
Innovation Solution
A dynamic pressure response system that uses air displacement boluses to displace residual fluid in the drainage tube, measuring pressure changes to determine fluid volume, thereby providing a fully automated and accurate measurement without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clinicians manually manipulate the drainage tubing to maneuver residual fluid into the collection container for measurement, then fluid output measurement accuracy is improved, but pressure spikes and fluid reflux into the patient may occur
Solution Approach 1:
The patent replaces manual mechanical manipulation of the drainage tube with an automated air displacement system. A controlled bolus of air is introduced through the drainage tube to push residual fluid into the collection container, eliminating the need for manual tube manipulation while achieving the same fluid displacement effect. This substitution resolves the contradiction by maintaining measurement accuracy without causing pressure spikes or reflux.
Solution Approach 2:
The patent introduces air as an intermediary substance to facilitate fluid movement. Instead of directly manipulating the tube or fluid, a controlled air bolus is used as a mediator to gently push the residual fluid into the collection container. This intermediary approach achieves accurate fluid measurement while avoiding the harmful effects of direct manual manipulation.
2Ease of operation
If fluid is allowed to accumulate in dependent loops of the drainage tube, then the system maintains simple passive drainage, but fluid output measurements become inaccurate
Solution Approach 1:
The patent implements periodic air displacement boluses to clear residual fluid from dependent loops at regular intervals or based on detection criteria. This periodic action maintains the simplicity of passive drainage during operation while periodically correcting fluid accumulation that would otherwise compromise measurement accuracy. The system transitions from purely passive to periodically active operation.
Solution Approach 2:
The patent employs sensors to detect fluid accumulation in dependent loops and triggers air displacement boluses based on this feedback. When the sensor detects residual fluid beyond a threshold, the system automatically initiates a corrective air bolus to clear the loop. This feedback mechanism maintains measurement accuracy while preserving passive drainage as the default operating mode.
3Extent of automation
If automated air displacement bolus is used to displace residual fluid, then manual intervention is eliminated and measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into existing drainage system components. The air delivery mechanism uses the same lumen and connector structures already present in the drainage tube, and the control system can leverage existing sensors and processors in modern drainage devices. By making existing components multi-functional (serving both drainage and measurement functions), the patent reduces the need for entirely new dedicated components, thereby limiting the increase in device complexity.
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 ensures accurate fluid measurement by eliminating the need for manual manipulation, reducing the risk of pressure spikes and reflux, and providing precise data for patient diagnosis.
Implementation Method 1
providing an air displacement bolus to the drainage lumen, displacing a dependent loop from a neutral position to a displaced position
Implementation Method 2
a sensor disposed within the drainage lumen and communicatively coupled with the control logic, the sensor configured to detect a pressure of fluid within the drainage lumen
Data Source
AI summary
A dynamic pressure response drainage system including control logic configured to enable measuring of residual fluid disposed within the drainage lumen. The residual fluid volume is measured by detecting the magnitude of the dynamic pressure response in the system containing the residual fluid when a sudden displacement (e.g. increase or decrease) of air volume occurs inside the system. The pressure burst magnitude is related to the pressure needed to move the mass of fluid, thus the fluid volume can be calculated from measurements of the burst pressure. The magnitude of the measured air pressure exhibits a dynamic pressure response corresponding to the mass of fluid in the tube. Either positive or negative pressure bursts can be used to produce and measure the corresponding positive or negative dynamic response spike pressure.