Balloon Inflation Control via Static Pressure Feedback
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Solution Overview
Problem
Current bowel irrigation systems face challenges in controlling the inflation of the inflatable balloon within the rectum, particularly due to physiological changes and resistance from scar tissue or stool, which can lead to overpressure and potential balloon rupture, necessitating a more controlled and safe inflation method.
Innovation Solution
A method involving a feedback loop process using a control unit with a pressure sensor to assess static pressure inside the inflatable balloon, allowing for step-wise inflation and deflation, ensuring compliance with pre-determined threshold values to prevent overpressure and rupture, while using liquid for inflation to maintain balloon size control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the balloon is inflated with a predefined amount of liquid in a single step, then the inflation process is simple and quick, but the risk of overpressure and balloon rupture increases due to physiological changes and resistance from scar tissue or stool
Solution Approach 1:
The inflation process is divided into multiple incremental steps, where a predefined amount of liquid is infused at a time followed by pressure assessment. This segmentation allows the system to monitor pressure at each stage and adjust subsequent inflation accordingly, preventing overpressure while maintaining efficient irrigation.
Solution Approach 2:
A feedback loop is implemented where the static pressure inside the balloon is assessed after each predefined amount of liquid is infused. Based on this pressure assessment, the control unit determines whether to continue inflation, pause, or terminate the process. This feedback mechanism dynamically adjusts the inflation process to prevent balloon rupture while ensuring adequate retention.
2Reliability
If the balloon is inflated slowly with frequent pressure checks, then the safety and control are improved, but the inflation time and process complexity increase
Solution Approach 1:
The system pre-defines the amount of liquid to be infused at each step before actual inflation occurs. This preliminary determination allows for efficient execution of the inflation process while maintaining safety controls, as the parameters for each step are established in advance based on expected pressure responses.
Solution Approach 2:
The system infuses a predefined amount of liquid that may be more than the minimum required, then assesses pressure to determine if additional liquid is needed. This approach ensures adequate retention is achieved while maintaining safety margins, balancing thorough inflation with time efficiency.
3Device complexity
If manual inflation control is used by non-medical personnel, then the device complexity is reduced, but the precision and safety of pressure monitoring deteriorates
Solution Approach 1:
The system performs self-assessment of the static pressure inside the balloon using an integrated pressure sensor and control unit. This eliminates the need for manual pressure assessment by non-medical personnel, ensuring accurate and consistent pressure monitoring while keeping the overall device operation simple and intuitive for users.
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 approach provides a safer and more controlled inflation process, minimizing the risk of balloon rupture and ensuring effective bowel irrigation by monitoring pressure changes and adjusting the inflation process accordingly, allowing for safer use by non-medical personnel.
Implementation Method 1
assessing a static pressure inside the balloon
Data Source
AI summary
A method for inflating an inflatable balloon of a catheter for a bowel irrigation system includes initiating an inflation process in response to inputs provided by a user including inflating the inflatable balloon with a predefined volume of the liquid, assessing a static pressure inside the inflatable balloon, generating an output from the processor based on the static pressure, and controlling a feedback loop based on a difference between two consecutively assessed static pressures.