Endoscopic Irrigation System for Stable Cavity Pressure
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Solution Overview
Problem
Current endoscopic distending systems using continuous flow irrigation face challenges in maintaining stable and predictable cavity pressure, leading to fluid turbulence and increased risk of fluid intravasation, with existing systems failing to provide absolute safety and efficiency.
Innovation Solution
A system utilizing two peristaltic pumps operating simultaneously at fixed flow rates to maintain precise cavity pressure independent of outflow rate, with a housing tube constriction site to minimize turbulence and allow excess fluid to bypass the inflow pump, enabling real-time fluid intravasation monitoring without flow sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If continuous flow irrigation is used to distend body tissue cavities, then cavity distension and fluid flow are achieved, but fluid turbulence and unstable cavity pressure occur
Solution Approach 1:
The system divides the fluid control function into two separate peristaltic pumps: one pump delivers irrigation fluid at a controlled rate, while the second pump removes excess fluid. This segmentation allows independent control of inflow and outflow, enabling stable cavity pressure maintenance despite continuous fluid circulation and turbulence.
2Measurement precision
If flow rate sensors are used to monitor fluid intravasation, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the existing peristaltic pumps' flow rate measurements to self-determine fluid intravasation. By comparing the known pump output flow rate with the actual fluid collection in the reservoir, the system calculates intravasation without requiring additional flow sensors, thereby maintaining measurement accuracy while avoiding increased device complexity.
3Productivity
If high flow rates are used to maintain cavity distension, then cavity distension is improved, but fluid intravasation risk increases
Solution Approach 1:
The system implements feedback control by continuously monitoring the relationship between pump flow rates and actual cavity distension. The controller adjusts the second pump's removal rate to maintain optimal cavity pressure, preventing excessive flow rates that could cause intravasation while ensuring adequate distension for surgical visibility.
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 stable cavity pressure, reduces fluid turbulence, and accurately monitors fluid intravasation, enhancing patient safety and surgical efficiency by maintaining desired pressure without increasing intravasation risk.
Implementation Method 1
A system utilizing two peristaltic pumps operating simultaneously at fixed flow rates
Data Source
AI summary
The present invention provides a system and a method for distending a body tissue cavity of a subject by continuous flow irrigation such that minimal or negligible fluid turbulence is present inside the cavity, such that any desired cavity pressure can be created and maintained for any desired outflow rate. The present invention also provides a method for accurately determining the rate of fluid loss, into the subject's body system, during any endoscopic procedure without utilizing any deficit weight or fluid volume calculation or flow rate sensor. The system and the methods of the present invention described above can be used in any endoscopic procedure requiring continuous flow irrigation few examples of such endoscopic procedures being hysteroscopic surgery, arthroscopic surgery, trans uretheral surgery, endoscopic surgery of the brain and endoscopic surgery of the spine.