Cuffed Tracheostomy Tube Reinforcement
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Solution Overview
Problem
Existing tracheostomy tubes face issues with reinforcement, as the inflation line must be wound with a close pitch to achieve sufficient reinforcement, leading to high resistance to gas flow and discomfort due to a protruding ridge on the outer surface.
Innovation Solution
The medico-surgical tube features a reinforcement member with portions extending around the shaft up to but not crossing the inflation lumen, providing reinforcement while keeping the outer surface smooth by using a boustrophedon or zig-zag pattern of loops around the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inflation line is wound with a close pitch to achieve sufficient reinforcement, then the reinforcement strength is improved, but the resistance to gas flow increases and the outer surface develops a protruding ridge causing discomfort
Solution Approach 1:
The reinforcement member transitions from a traditional continuous helical structure to a discrete loop structure that extends around the shaft in a boustrophedon or zig-zag pattern. This dimensional reconfiguration allows the reinforcement to provide structural support while eliminating the protruding ridge on the outer surface, as the loops are contained within the wall thickness rather than forming a continuous external helix.
Solution Approach 2:
The continuous helical reinforcement is segmented into discrete loops extending around the shaft. These loops are spaced along the length of the shaft and connected by segments within the wall, creating a segmented reinforcement structure that maintains strength while eliminating the harmful continuous protruding ridge effect.
2Strength
If the inflation line is wound with a close pitch to achieve sufficient reinforcement, then the reinforcement strength is improved, but the resistance to gas flow along the inflation line increases
Solution Approach 1:
The reinforcement structure is reconfigured from a tight continuous helix to discrete loops with spacing along the shaft. This dimensional change reduces the number of turns required for sufficient reinforcement, thereby reducing the total length of the inflation line and its associated gas flow resistance.
Solution Approach 2:
Instead of using a continuous close-pitch helix throughout the entire length, the reinforcement is applied partially through discrete loops at specific locations. This partial action approach provides sufficient reinforcement where needed while minimizing the total inflation line length and gas flow resistance.
3Strength
If a continuous helical reinforcement is used, then the tube gains structural strength, but the outer surface becomes uneven causing trauma to tissue
Solution Approach 1:
The reinforcement loops are contained within the wall thickness of the tube rather than forming a continuous external helix. This dimensional containment ensures a smooth outer surface that does not traumatize tissue while maintaining structural strength through the internal loop structure.
Solution Approach 2:
The reinforcement is localized to discrete loops at specific positions along the shaft rather than a continuous helix. This local quality approach provides structural support where needed while maintaining a smooth outer surface in contact with tissue, eliminating the harmful uneven surface effect.
Data Source
Figure 1
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Figure 4
AI summary
A cuffed tracheostomy tube has a shaft (10) with an inflation lumen (16) extending longitudinally along the shaft and opening at its patient end into a sealing cuff (13). The tube also includes a reinforcement member provided by a metal wire (25) wound into two sets of loops (26A) and (26B) of different widths. The loops (26) extend part way around the shaft (10) up to but without crossing the inflation lumen (16).