Variable Stiffness Medical Tube for Condensate Drain-Back
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Solution Overview
Problem
Existing medical tubes used in breathing circuits and insufflation systems face challenges in maintaining optimal temperature and humidity levels, leading to condensation issues and heat loss.
Innovation Solution
The development of medical tubes with a corrugated extruded conduit having distinct stiffness regions, where the first region adjacent the chamber end is stiffer than the second region adjacent the patient end, along with integrated heating elements and conductive filaments, to enhance temperature and humidity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the medical tube uses a uniform wall thickness throughout, then the manufacturing process is simple, but the tube cannot effectively control temperature and humidity in different regions
Solution Approach 1:
The patent applies local quality by varying the wall thickness of the medical tube along its length. The first region (proximal to the patient) has a first wall thickness, while the second region (distal to the patient) has a second wall thickness that is greater than the first. This localized variation in wall thickness allows different regions of the tube to have different thermal insulation properties, enabling effective temperature and humidity control where needed without complicating the entire tube structure.
2Loss of energy
If the medical tube has a thicker wall throughout, then insulation performance improves, but the tube becomes less flexible and harder to position
Solution Approach 1:
The patent resolves this contradiction by applying local quality through region-specific wall thickness design. The second region, which requires better insulation to prevent heat loss and condensation, has a greater wall thickness. The first region, where flexibility is more critical for positioning and patient comfort, has a thinner wall. This localized differentiation allows the tube to achieve optimal insulation performance in critical areas without compromising overall flexibility.
3Temperature
If the medical tube uses variable wall thickness, then temperature and humidity control improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the medical tube into distinct regions with different wall thickness characteristics. The first region has a first wall thickness and the second region has a second wall thickness, creating clearly defined segments. This segmented approach simplifies manufacturing compared to continuous variable thickness designs, as each segment can be controlled within standard tolerances during the extrusion process, reducing overall manufacturing precision requirements while still achieving effective temperature and humidity control.
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 design effectively reduces condensate accumulation by improving drain-back and maintaining a more vertical position, while also providing better insulation and energy efficiency in delivering humidified gases to patients.
Implementation Method 1
one or more heating elements on or in the conduit
Implementation Method 2
The wall is stiffer in a first region of the conduit adjacent the first opening than in a second region of the conduit adjacent the second opening
Data Source
AI summary
This invention relates to a medical tube comprises an elongate conduit having a first opening, a second opening, a longitudinal axis, a lumen extending between the first opening and the second opening along the longitudinal axis, and a corrugated wall, formed from an extruded material, extending between the first opening and the second opening and surrounding the lumen. The wall is stiffer in a first length of the conduit adjacent the first opening than in a second length of the conduit adjacent the second opening. The variable stiffness of the tube wall can improve the thermal profile of the tube as well as improve drain-back of condensation into a humidifier providing humidified gas to the tube.