Catheter With Dual-Diffusion Wall For Sustained Anti-Infective Release
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Solution Overview
Problem
Semi-permanent vascular access catheters used for prolonged medical procedures are prone to bacterial attachment and biofilm formation, leading to infections due to the rapid release of anti-infective agents from existing coatings, which provides short-term protection and leaves the catheter vulnerable to infection.
Innovation Solution
A catheter design with a charge holding cavity and dual diffusion rates through inner and outer portions, allowing controlled release of anti-infective agents from within the catheter to the outer surface, using materials with different durometer hardness and additives to regulate absorption and diffusion rates, ensuring prolonged protection against bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-infective agents are applied to the catheter surface, then protection against bacterial growth is improved, but the duration of protection deteriorates because agents are released quickly and leave the catheter vulnerable to infection
Solution Approach 1:
The catheter wall is divided into inner and outer portions with different diffusion properties. The inner portion allows rapid agent release while the outer portion provides controlled, sustained release, segmenting the release function to resolve the contradiction between initial protection effectiveness and long-term durability
Solution Approach 2:
Different portions of the catheter wall are assigned different material properties - the inner portion has higher durometer hardness and different additive composition compared to the outer portion, creating local quality variations that enable differential diffusion rates and prolonged agent release
2Ease of manufacture
If a single-material catheter wall is used, then manufacturing simplicity is maintained, but control over therapeutic compound diffusion rates deteriorates
Solution Approach 1:
The catheter wall is constructed as a composite structure with inner and outer portions made of different polymeric materials having different durometer hardness and additive compositions, enabling independent optimization of diffusion rates while maintaining structural integrity and manufacturability
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 controlled release of anti-infective agents maintains effective protection against bacterial attachment and biofilm formation throughout the catheter's usage period, reducing the need for frequent recharging and minimizing infection risks.
Implementation Method 1
the inner portion is formed so that a first diffusion rate of the therapeutic compound therethrough is different from a second diffusion rate through the outer portion
Implementation Method 2
using materials with different durometer hardness and additives to regulate absorption and diffusion rates
Data Source
AI summary
A catheter extending from a distal end which, when in an operative position is inserted within a body of a patient, to a proximal end, the catheter comprising a charge holding cavity to which a therapeutic compound is to be supplied and a wall including inner and outer portions, an inner surface of the inner portion surrounding the charge holding cavity with an outer portion surrounding at least a portion of an outer surface of the inner portion, wherein the inner portion is formed so that a first diffusion rate of the therapeutic compound therethrough is different from a second diffusion rate through the outer portion.