Surgical Fluid Management Recirculation and Pressure Control
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Solution Overview
Problem
Current fluid management systems for hysteroscopic procedures, such as fibroid resection, face challenges in minimizing the risk of excessive fluid uptake by the patient, which can lead to serious complications, due to the use of high pressures and non-conductive fluids, necessitating complex monitoring systems to prevent intravasation.
Innovation Solution
A re-circulating fluid management system that limits the initial volume of distending fluid, includes a probe with a reciprocating cutting sleeve for tissue resection, and a controller to adjust flow rates and pressures, with sensors for monitoring fluid pressure and volume, alerting for excessive fluid loss and automatically shutting down the system if malfunctions occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high pressure is used to distend the uterine cavity, then the working space is adequately created, but the risk of fluid intravasation increases
Solution Approach 1:
The system continuously monitors fluid pressure and volume through sensors that provide real-time feedback to the control unit. When fluid pressure approaches unsafe levels or when fluid loss exceeds predetermined thresholds, the system automatically adjusts or terminates fluid administration, preventing intravasation while maintaining adequate distension pressure for the procedure
Solution Approach 2:
The system dynamically adjusts fluid pressure and flow rate parameters based on real-time monitoring data. The control unit modifies these parameters to maintain pressure within a safe operating range that provides adequate working space without exceeding thresholds that would cause intravasation, thereby resolving the contradiction between sufficient distension and safety
2Quantity of substance
If a large volume of distending fluid is used, then adequate working space is maintained, but the risk of excessive fluid uptake by the patient increases
Solution Approach 1:
The system continuously monitors the volume of fluid administered and the volume of fluid returning from the uterine cavity. By comparing these volumes in real-time, the system can detect when fluid loss exceeds expected amounts and automatically respond by reducing or stopping fluid administration, preventing excessive fluid uptake while maintaining adequate working space
Solution Approach 2:
The system uses the returning fluid itself as a monitoring indicator. By measuring the volume and characteristics of fluid that returns from the uterine cavity, the system self-regulates fluid administration to match actual needs, avoiding both excessive fluid use and inadequate working space maintenance
3Reliability
If continuous monitoring of fluid uptake is implemented, then patient safety is improved, but system complexity increases
Solution Approach 1:
The fluid management system performs multiple functions through integrated components: it administers fluid, monitors pressure, measures volume, detects intravasation, and controls termination all through a single unified system. This multi-functionality reduces the need for separate monitoring devices and simplifies the overall system while maintaining comprehensive safety monitoring
Solution Approach 2:
The system automatically monitors and responds to fluid uptake conditions without requiring external intervention. The control unit continuously processes sensor data and automatically terminates fluid administration when safety thresholds are exceeded, providing self-monitoring and self-protection that improves safety without requiring complex external monitoring infrastructure
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 reduces the risk of excessive fluid uptake by the patient, simplifies fluid management, and enables efficient tissue resection with reduced fluid usage, making procedures safer and more efficient.
Implementation Method 1
a fluid is administered through a passageway in the hysteroscope under sufficient pressure to expand or distend the uterine cavity
Implementation Method 2
The outer sleeve has a cutting window which can be engaged against fibroid or other tissue to be resected. By pressing the window against the tissue, the fibroid or the tissue intrudes into the window, and the inner cutting sleeve can be distally advanced to severe the tissue.
Data Source
AI summary
A fluid management system for use with a fluid reservoir includes an inflow pump and an outflow pump. The inflow pump is connectable to a probe for delivering a distention fluid to a body cavity. The outflow pump removes the distention fluid through the same probe, thus establishing a re-circulating volume of distention fluid within the body cavity. The removed fluid is filtered and returned to a fluid reservoir for eventual recycling to the body cavity. A controller adjusts the flow rates of the inflow pump and the outflow pump to maintain a pre-selected fluid pressure or volume within the body cavity.