Valve System for Inflatable Medical Device Pressure Regulation
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Solution Overview
Problem
Existing indwelling medical devices with inflatable portions face issues of pressure imbalances due to body movements, leading to potential trauma or expulsion, as they lack self-adjusting mechanisms to regulate internal pressure effectively.
Innovation Solution
A valve system comprising a one-way valve and a compensator that allows fluid to enter or leave the inflatable portion in response to pressure changes, ensuring the balloon inflates and deflates accordingly to maintain optimal pressure, featuring a movable seal and fluid connector for controlled fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the balloon is inflated to retain and seal the catheter within the body, then the catheter is securely positioned, but pressure changes within the body may cause over-inflation leading to trauma
Solution Approach 1:
The valve system provides automatic feedback control by sensing pressure changes within the body and responding through the one-way valve and compensator mechanism. When pressure increases, the compensator allows fluid escape; when pressure decreases, the one-way valve permits fluid entry, maintaining optimal balloon pressure without external intervention
Solution Approach 2:
The valve system is self-regulating and requires no external control or monitoring. The one-way valve and compensator work autonomously to maintain proper inflation levels, allowing the device to service itself by automatically adjusting to pressure changes caused by body movements
2Ease of operation
If the balloon is deflated for removal from the body, then the device can be withdrawn, but pressure changes may cause under-inflation leading to expulsion during use
Solution Approach 1:
The valve system continuously monitors pressure conditions and automatically responds to prevent under-inflation. When body pressure decreases, the one-way valve opens to allow fluid entry, ensuring the balloon remains sufficiently inflated to maintain retention throughout the device's intended dwell time
Solution Approach 2:
The valve system prepares for pressure changes in advance by having pre-positioned one-way valves and compensators that immediately respond to pressure differentials. This preliminary arrangement ensures rapid adjustment before pressure changes can cause under-inflation or expulsion
3Reliability
If a self-adjusting valve system is added to regulate pressure, then pressure control is improved, but device complexity increases
Solution Approach 1:
The valve system achieves automatic pressure regulation using passive one-way valves and a compensator that require no external power, control systems, or complex mechanisms. The simplicity of the self-service approach minimizes added complexity while maintaining reliable pressure control
Solution Approach 2:
The complex active control systems are extracted and replaced with simple passive one-way valve mechanisms. By removing the need for pumps, sensors, and electronic controls, the design achieves pressure regulation 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 valve system effectively regulates pressure within the inflatable portion, preventing over-inflation and under-inflation, thereby reducing the risk of trauma and ensuring the device remains securely in place during body movements.
Implementation Method 1
a one-way valve associated with the passageway, the one-way valve being movable between an open position and a closed position, the open position permitting fluid to pass through the passageway into the inflatable portion
Implementation Method 2
a compensator associated with the passageway, the compensator permitting fluid to enter or leave the passageway in response to pressure changes within the passageway caused by pressure changes in the inflatable portion of the medical device
Implementation Method 3
the compensator includes a porous plug permitting fluid flow therethrough, preferably in two directions
Implementation Method 4
a movable seal and a fluid connector associated with the passageway, the movable seal being movable to seal the one-way valve and the compensator while permitting fluid to be added or removed from the passageway through the fluid connector
Data Source
AI summary
The present invention relates to a valve system for an inflatable portion of an indwelling medical device and more particularly to a valve system for fluid regulation of a catheter comprising a fluid inflatable portion that undergoes pressure changes within the body during use. The present invention also relates to methods of treatment using said valve system and indwelling medical devices comprising said valve systems.