Polymer Workpiece Surface Treatment via Combustion
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Solution Overview
Problem
Polymer particles from joint implants, such as those made of UHMWPE, can cause osteolysis due to manufacturing inaccuracies and wear, leading to foreign body reactions and loosening of the prosthesis, necessitating a method to reduce these particles and improve fit accuracy.
Innovation Solution
A method involving placing a polymer workpiece in an explosion chamber, igniting a flammable gas mixture to achieve temperatures above the polymer's melting point, removing irregularities through burning or evaporation, thereby improving fit accuracy and preventing particle detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used to produce polymer components, then production efficiency is maintained, but manufacturing inaccuracies and surface irregularities occur that lead to polymer particle detachment
Solution Approach 1:
The patent replaces mechanical post-processing methods (manual deburring, machining) with a thermal field method (controlled combustion/exlosion). A flammable gas mixture is ignited to create a controlled thermal field that removes surface irregularities through selective heating and burning, substituting mechanical removal with thermal processing. This resolves the contradiction by achieving superior surface quality without the time-consuming mechanical operations.
Solution Approach 2:
The patent changes the physical state and parameters of the polymer surface through controlled exposure to extreme temperatures during gas mixture combustion. By precisely controlling combustion parameters (gas composition, pressure, duration), the method transforms surface irregularities into smooth surfaces through phase changes and selective material removal, improving manufacturing precision while maintaining efficient production.
2Manufacturing precision
If manual post-processing is used to remove irregularities, then surface quality improves, but production time increases and biocompatibility may be compromised
Solution Approach 1:
Manual mechanical post-processing is replaced with controlled combustion. The thermal field from ignited gas mixture acts on surface irregularities, removing them through burning and evaporation rather than mechanical cutting or grinding. This dramatically reduces processing time while achieving superior surface quality and eliminating concerns about mechanical contamination affecting biocompatibility.
Solution Approach 2:
The patent converts the potentially harmful effect of high-temperature combustion into a beneficial process. The controlled explosion or sudden combustion, which could damage the polymer, is precisely managed to selectively remove only surface irregularities while preserving the bulk material properties and biocompatibility. The harmful thermal energy is directed specifically at defects, transforming it into a surface refinement tool.
3Reliability
If polymer particles detach from the implant, then wear occurs, but this leads to osteolysis and foreign body reactions that compromise implant reliability
Solution Approach 1:
The patent applies surface treatment before implantation to eliminate the source of future particle detachment. By removing surface irregularities, micro-defects, and protrusions through controlled combustion, the method pre-prevents the conditions that would lead to particle detachment during implant operation. This preliminary action ensures long-term implant reliability by eliminating wear initiation sites before the implant enters the body.
Solution Approach 2:
The patent applies preliminary anti-action by removing surface irregularities that would otherwise generate harmful polymer particles. The controlled combustion process preemptively eliminates surface defects that could cause particle detachment, foreign body reactions, and osteolysis. This preventive approach counteracts the potential harmful effects before they can manifest during implant operation, ensuring long-term reliability.
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 method effectively removes manufacturing irregularities without altering the polymer's biocompatibility, reducing the risk of osteolysis and ensuring a precise fit between the polymer and anchoring components, thereby preventing relative movements and polymer particle detachment.
Implementation Method 1
igniting the flammable gas mixture, by which a temperature is produced by ignition of the gas mixture in the explosion chamber that lies above the melting point of a polymer of the polymer workpiece
Implementation Method 2
The explosion or sudden combustion caused by igniting the gas mixture results in the removal of any projecting polymer sections by burning or evaporation
Data Source
AI summary
The present invention provides a method for treating a polymer workpiece for use in a joint implant. It comprises the steps of placing the polymer workpiece in an explosion chamber, introducing a combustible gas mixture into the explosion chamber and igniting the combustible gas mixture. Igniting the gas mixture in the explosion chamber produces a temperature that lies above the melting point of a polymer of the polymer workpiece.