Compression Resistant Hose Locking Mechanism
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Solution Overview
Problem
Current hose reinforcements, such as braids and coils, fail to effectively resist compressive creep caused by axial loads in medical applications, leading to loss of accurate positioning of medical devices over time.
Innovation Solution
A hose design featuring a first layer forming the inner diameter, a second braided layer, and a third helically coiled layer, where the braided layer locks against the helically coiled layer upon longitudinal compressive force, preventing further compression and movement of the medical device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional reinforcements (braids or coils) are used in hoses, then flexibility and ease of manufacture are improved, but compressive creep resistance deteriorates
Solution Approach 1:
The reinforcement is divided into two separate layers: a braided layer and a helically coiled layer. Each layer performs a specific function - the braided layer provides structural support while the helically coiled layer resists compressive creep through its unique geometry that locks under axial compression loads.
Solution Approach 2:
The hose combines two different reinforcement structures (braid and helical coil) made from complementary materials to create a composite reinforcement system that simultaneously provides flexibility, structural integrity, and compressive creep resistance that neither layer could achieve alone.
2Adaptability or versatility
If hose length is increased for medical implant applications, then adaptability is improved, but compressive creep worsens
Solution Approach 1:
The long hose is constructed with distributed reinforcement layers extending along its length, with the helically coiled layer providing continuous compressive creep resistance throughout the entire hose length, preventing cumulative deformation that would occur in segmented or unreinforced sections.
Solution Approach 2:
The helically coiled layer's geometric parameters (helix angle, wire diameter, pitch) are optimized to provide effective compressive creep resistance while maintaining the hose's flexibility and adaptability for implantation in various patient anatomies and device configurations.
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 hose minimizes longitudinal compression creep, maintaining accurate positioning of medical devices by providing stiffness and resistance to compressive forces, thereby ensuring consistent performance over time.
Implementation Method 1
A longitudinal compressive force applied to the hose causes the braided layer to lock against the helically coiled layer
Implementation Method 2
Tests have shown that methods of reinforcing with coil or braid alone do not provide significant creep resistance when loaded in a manner representative of this application
Data Source
AI summary
Described herein is a hose, wherein the hose has a length having a distal end and a proximal end, and an inner diameter and an outer diameter. The hose is comprised of a first layer; and a second layer, wherein the first layer and the second layer extend along at least a portion of the length and wherein a longitudinal compressive force applied to either the distal end or the proximal end of the hose causes the first layer to lock against the second layer.