Extrusion Guide Channel Constant Conicity
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Solution Overview
Problem
Existing extrusion apparatuses for manufacturing medical instruments like catheters and guidewires face challenges in precisely arranging and protecting sensitive rod-shaped bodies with constant conicity, as conventional designs with edges and transitions lead to material damage and congestion, and current solutions are inefficient in preventing oscillations and ensuring reproducibility.
Innovation Solution
An extrusion apparatus with a global sleeve featuring guide channels of constant conicity along its entire length, minimizing edges and angles to prevent material deposition and simplify cleaning, while allowing precise arrangement of rod-shaped bodies and reducing vibrations, manufactured using wire erosion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional guide channels with edges and transitions are used, then manufacturing is simpler, but material deposition and congestion occur leading to reduced reliability
Solution Approach 1:
The guide channel is designed with constant conicity, replacing conventional edges and transitions with smooth curved surfaces. This eliminates sharp corners and abrupt changes in geometry that cause material deposition, ensuring continuous flow of molten polymer without congestion while maintaining manufacturing feasibility through wire erosion techniques.
2Manufacturing precision
If rod-shaped bodies contact guide channel walls during insertion, then positioning is simpler, but material damage occurs reducing product quality
Solution Approach 1:
The constant conicity of the guide channel creates smooth curved walls that prevent sharp contact points between rod-shaped bodies and channel surfaces. This curved geometry allows rod-shaped bodies to be guided into precise positions without experiencing concentrated stresses or friction that would cause material damage, thereby maintaining both positioning accuracy and structural integrity.
3Reliability
If cleaning of guide channels is performed frequently, then material deposition is removed, but production time is lost
Solution Approach 1:
The smooth curved geometry of the constant conicity guide channel prevents material from adhering strongly to surfaces, as there are no sharp corners or abrupt transitions where material can accumulate and harden. This design inherently resists material deposition, dramatically reducing the frequency and effort required for cleaning operations and minimizing production downtime.
4Manufacturing precision
If oscillations of rod-shaped bodies are not prevented, then insertion is simpler, but reproducibility of extrusion is reduced
Solution Approach 1:
The constant conicity guide channel provides smooth curved contact surfaces that continuously guide and stabilize rod-shaped bodies during insertion. The curved geometry naturally dampens oscillations through distributed friction contact along the channel length, preventing erratic movements that would compromise extrusion reproducibility without requiring additional complex stabilization mechanisms.
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 apparatus ensures precise geometric arrangement and protection of rod-shaped bodies, reducing material damage and oscillations, enhancing reproducibility and mechanical properties of the extruded medical instruments by minimizing contact with the guide channel walls and maintaining the structural integrity of the rod-shaped bodies.
Implementation Method 1
minimizing contact with the guide channel walls and maintaining the structural integrity of the rod-shaped bodies
Implementation Method 2
manufactured using wire erosion techniques
Data Source
AI summary
According to the invention an apparatus for extrusion of a structured extrudate, which can be introduced into a human or animal body, is provided. This apparatus comprises an extrusion apparatus with a housing, whereas the housing has a revolving lateral wall which at a front end in the direction of production is provided with a nozzle wall with an outlet nozzle, and in the direction of production prior to that with a global sleeve, whereas the space in the housing between the global sleeve, the lateral wall and the outlet nozzle confines an extrusion space, and the housing in the region of the extrusion space can be connected to a polymer feeding appliance. In the global sleeve at least one guide channel extending in the direction of production is provided in order to be able to insert at least one rod-shaped body from a feeding appliance for rod-shaped bodies into the extrusion space, whereas the at least one guide channel is arranged in about straight alignment to the outlet nozzle.