Insufflator Pressure Control via Inflection Points
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Solution Overview
Problem
Current medical insufflators rely on heuristic methods to determine insufflating pressure, leading to inconsistent cavity expansion and increased clinical risks due to over- or under-inflation, as pressures vary with subject body composition and position, lacking a precise method to maintain the lowest safe pressure for adequate working volume.
Innovation Solution
An insufflator with a set-up mode that uses pressure and flow sensors, along with a signal processor to determine the optimum maximum pressure by analyzing pressure/volume relationships, ensuring the cavity is inflated at the lowest safe pressure for effective surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heuristic methods are used to determine insufflating pressure, then the insufflation process is simple to operate, but the working volume is inconsistent and clinical risks increase
Solution Approach 1:
The system continuously monitors cavity pressure and volumetric gas flow, using this feedback to dynamically adjust the insufflating pressure. The processor compares real-time pressure measurements with target pressure ranges and modulates gas delivery accordingly, ensuring consistent working volume while maintaining ease of operation through automated control.
Solution Approach 2:
The insufflator system performs self-regulation by automatically determining the subject-specific target pressure range and adjusting gas delivery without continuous manual intervention. The system uses its own sensors and processor to maintain optimal working conditions, reducing the need for surgeon intervention while ensuring reliable working volume.
2Volume of stationary object
If higher insufflating pressure is used, then adequate working volume is achieved in subjects with low cavity compliance, but clinical risks such as reduced venous return increase
Solution Approach 1:
The system dynamically adjusts the insufflating pressure parameter based on real-time monitoring of cavity compliance and working volume requirements. By changing pressure parameters adaptively rather than using fixed high pressures, the system achieves adequate working volume in low-compliance subjects while minimizing clinical risks through precise pressure control within subject-specific safe ranges.
Solution Approach 2:
The insufflation system transitions from static fixed-pressure operation to dynamic pressure adjustment. The processor continuously modifies pressure delivery based on feedback from pressure sensors and flow meters, allowing the system to achieve necessary working volume while adapting pressure levels to subject-specific compliance characteristics and minimizing harmful effects.
3Measurement precision
If subject-specific target pressure range is determined through pressure/volume relationship analysis, then working pressure precision is improved, but device complexity increases
Solution Approach 1:
The insufflator integrates multiple functions into a single device: gas delivery, pressure monitoring, flow measurement, and automated pressure range determination. The processor performs both routine insufflation control and subject-specific target pressure determination using the same hardware components, achieving high measurement precision without proportionally increasing device complexity through multi-functional integration.
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
This solution allows for precise determination of the working pressure range, preventing over-inflation and reducing clinical risks by maintaining the cavity at the lowest safe pressure for optimal working volume, enhancing surgical safety and efficiency.
Implementation Method 1
a pressure sensor for producing a signal indicative of the pressure in the cavity
Implementation Method 2
a flow sensor for monitoring flow of insufflating gas being delivered to the cavity and for producing a signal indicative of the cumulative volume of insufflating gas delivered to the cavity
Data Source
AI summary
An insufflator (100) is operable in a set-up mode and in a normal insufflating mode. In the set-up mode, a minimum working pressure value and an optimum maximum pressure value of a working pressure range for a cavity (3) to be insufflated is determined. A microprocessor (122) in the set-up mode operates a flow controller (124) to deliver insufflating gas at a constant rate to the cavity (3). The microprocessor (122) reads signals from a pressure sensor (137) indicative of the cavity pressure and from a flow sensor (135) indicative of the flow rate of insufflating gas to the cavity (3) at predefined time intervals from the commencement of insufflating of the cavity, and determines a pressure/volume relationship (150, 153) between cavity pressure and the volume of the cavity (3) from the cumulative volume of insufflating gas delivered to the cavity (3). The minimum working pressure value is determined as the cavity pressure at a first point of inflection (A) of the graphs (150, 153) representative of the pressure/volume relationship. The optimum maximum pressure value is determined as the cavity pressure at a second point of inflection (155) of the graphs (150, 153).