Fistula Catheter Dual Balloon Segmentation
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Solution Overview
Problem
Conventional fistula catheters face manufacturing difficulties due to the embedding of reinforcing materials within the balloon and lack of improvement in the connection between the balloon and the supply tube, leading to issues when the balloon deteriorates or breaks, causing the catheter to dislodge from the fistula.
Innovation Solution
A fistula catheter design featuring dual balloons, an inner balloon and an outer balloon, where the inner balloon is filled with a granular substance and the outer balloon with liquid, separated by a filter to prevent the catheter from dislodging even if one balloon collapses, ensuring both balloons expand to maintain the catheter's position within the fistula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reinforcing material is embedded within the balloon, then the balloon is less likely to deteriorate or break, but it becomes difficult to manufacture
Solution Approach 1:
The single balloon is segmented into an inner balloon and an outer balloon, each serving distinct functions. The inner balloon contains granular substance for primary anchoring, while the outer balloon contains liquid for additional support, eliminating the need for complex reinforcing materials within a single balloon structure.
Solution Approach 2:
The dual-balloon system combines different filling materials (granular substance and liquid) in a composite configuration, achieving enhanced durability and reliability without requiring reinforcing materials embedded within the balloon membrane itself.
2Strength
If the balloon is strengthened, then the catheter is less likely to break, but the connection between the balloon and supply tube remains weak
Solution Approach 1:
The balloon system is segmented into inner and outer balloons with different filling materials, allowing the connection point to be reinforced independently. The granular substance in the inner balloon provides distributed support at the connection point, preventing weak links without requiring overall balloon strengthening.
Solution Approach 2:
The inner balloon filled with granular substance provides localized reinforcement at critical areas such as the connection point between the balloon and supply tube, while the outer balloon provides overall structural support, achieving both strength and connection reliability.
3Ease of operation
If water is used in the balloon, then the catheter can be easily inserted, but the catheter comes out when the water seeps out or the balloon breaks
Solution Approach 1:
The filling material parameter is changed from liquid water to a compound liquid containing granular substance. This parameter change allows the material to maintain fluid properties for easy insertion while providing structural integrity and position stability through the granular component that does not seep out.
Solution Approach 2:
The compound liquid combining granular substance and liquid provides both the fluidity needed for easy insertion and the structural stability needed to prevent catheter dislodgement, eliminating the trade-off between ease of operation and position stability.
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 dual-balloon configuration prevents the catheter from being dislodged from the fistula, even if one balloon breaks or collapses, maintaining an expanded state and ensuring the catheter remains securely in place, reducing the need for frequent reformation of the fistula.
Implementation Method 1
provides a filter 25 on the filler port 24 that communicates with the secondary cavity and the outer balloon so that the liquid within the compound liquid can pass through but the granular substance cannot
Implementation Method 2
an inner balloon 31 that communicates with the secondary cavity through filler ports 23 and 24 provided on the peripheral surface of the supply tube, and an outer balloon 32 provided on the outer peripheral side of the inner balloon, respectively, and is configured so that an empty space is formed between the inner balloon and the outer balloon at the time of expansion
Data Source
AI summary
A fistula catheter that can prevent separating from the fistula by an inner balloon even if an outer balloon collapses by configuring an internal fixed part with an inner side balloon and an outer side balloon is disclosed. The fistula catheter A has an external fixed part, a supply tube with a primary cavity and a secondary cavity, and an internal fixed part on the tip end side outer periphery of the supply tube, expandable by a compound liquid that includes barium sulfate and distilled water supplied though the secondary cavity. The internal fixed part can be an inner balloon and an outer balloon that communicate with the secondary cavity through filler ports on the peripheral surface of the supply tube. A filter on the filler port can enable distilled water in the compound liquid to be filled into the outer balloon from the secondary cavity through the filter, and the compound liquid can be filled into the inner balloon.