Fluid Management System with Intermediary Pressure Sensor
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Solution Overview
Problem
Surgical fluid management systems are inconvenient to use and difficult to monitor, especially when the patient and fluid management console are at different elevations, as they struggle to accurately measure pressure in the working space.
Innovation Solution
A fluid management system with a roll stand, control unit, disposable or multiple-use cassette, and peristaltic pumps that include flexible tubing loops for pressurizing a pressure cuff and regulating fluid outflows, along with a display for operating parameters, and a mechanism for sensing conditions and locking the cassette in place, enabling precise pressure control and fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fluid management systems are used with patient and console at different elevations, then the system can operate, but pressure measurement accuracy deteriorates
Solution Approach 1:
A pressure sensor is introduced as an intermediary device positioned at the cassette level (near the patient) to directly measure fluid pressure at the source. This intermediary measurement point eliminates the need for complex elevation-based pressure calculations between patient and console, providing accurate pressure data regardless of their relative positions.
Solution Approach 2:
The traditional mechanical/elevation-based pressure measurement system is replaced with an electronic pressure sensor that directly measures fluid pressure. This substitution eliminates the need for mechanical pressure transmission through elevation differences and complex calculation systems.
2Ease of operation
If manual cassette loading is used, then the system structure can be simple, but ease of operation deteriorates
Solution Approach 1:
The system performs self-verification by automatically detecting whether a cassette is properly loaded through sensor activation. When the cassette is inserted, sensors detect its presence and verify proper positioning, automatically alerting the user if loading is incorrect. This eliminates the need for manual verification procedures while keeping the loading mechanism itself simple.
Solution Approach 2:
Visual or audible feedback mechanisms provide immediate confirmation to the user about cassette loading status. The system alerts users when the cassette is successfully loaded or when loading has failed, enabling quick correction without complex loading mechanisms.
3Measurement precision
If pressure sensing is implemented in the cassette, then pressure measurement accuracy improves, but device complexity increases
Solution Approach 1:
The pressure sensing function is segmented and integrated into the disposable cassette rather than the main console. This places the sensor close to the fluid source where pressure measurement is most critical, while keeping the complex electronics localized in the replaceable cassette module.
Solution Approach 2:
A flexible membrane is used as the pressure sensing element in the cassette. This thin film can directly interface with the fluid while transmitting pressure information to the sensor, providing accurate measurement with minimal structural 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 allows for accurate pressure measurement and control in the working space, alerting users to cassette loading issues and providing automatic locking, enabling efficient and precise fluid management during procedures.
Implementation Method 1
peristaltic pumps that include flexible tubing loops for pressurizing a pressure cuff
Implementation Method 2
a mechanism for sensing conditions and locking the cassette in place, enabling precise pressure control
Data Source
AI summary
Fluid management systems used, for example, in endoscopic procedures.