Prosthesis Surface Treatment for Reduced Installation Force
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Solution Overview
Problem
Current prosthesis installation methods require significant impaction forces, which can be risky and inefficient, especially during procedures like hip and knee replacements, where reducing these forces would enhance safety and ease of insertion.
Innovation Solution
The development of a surface treatment for prostheses that provides asymmetric installation forces, allowing easier insertion by manipulating friction coefficients and surface structures to reduce resistance during installation, while maintaining stability post-installation through osseointegration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impaction forces are used to install prosthesis, then the prosthesis can be securely installed in the bone, but the installation process becomes risky and requires excessive force that may damage surrounding tissue
Solution Approach 1:
The patent applies surface treatment to change the friction parameters at the prosthesis-bone interface. By modifying surface roughness and applying coatings, the static friction coefficient is increased to maintain secure installation, while the kinetic friction coefficient is reduced to enable easier insertion with lower impact forces during the installation process
Solution Approach 2:
The patent creates asymmetric friction characteristics where the friction coefficient differs between insertion and extraction directions. The surface treatment is designed so that during insertion, kinetic friction is lower than static friction, allowing easy insertion but secure retention once installed. This asymmetry enables reliable installation without requiring excessive impact forces
2Stability of the object's composition
If high impaction forces are applied during prosthesis installation, then the prosthesis achieves stable fixation, but the procedure becomes less safe and more difficult to control
Solution Approach 1:
The surface treatment modifies friction parameters to decouple the relationship between installation force and fixation stability. By increasing static friction through surface roughness and coatings, stable fixation is achieved without requiring high impact forces during installation, improving both safety and controllability
Solution Approach 2:
The surface treatment is applied in advance to the prosthesis before installation. This preliminary action prepares the surface with optimized friction characteristics, ensuring that during the actual installation process, the prosthesis will achieve stable fixation with controlled, lower forces, making the procedure safer and more controllable
3Force
If the prosthesis surface is treated to reduce installation forces, then easier insertion is achieved, but the risk is that post-installation stability and osseointegration may be compromised
Solution Approach 1:
The surface treatment creates different friction parameters for different phases: during installation, kinetic friction is reduced to enable easier insertion with lower forces; after installation, static friction is increased to ensure stable fixation and promote osseointegration. This parameter differentiation resolves the contradiction between easy insertion and stable retention
Solution Approach 2:
The friction characteristics of the surface treatment are dynamic rather than static. The surface is designed to exhibit different friction behaviors during the installation phase versus the post-installation phase, allowing easy insertion followed by secure stabilization. This dynamic behavior enables both easier installation and maintained stability
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 approach reduces the forces required for prosthesis installation, enabling safer and more controlled procedures by shifting friction from static to kinetic coefficients, facilitating easier insertion and stable fixation within the bone.
Implementation Method 1
manipulating friction coefficients and surface structures to reduce resistance during installation
Implementation Method 2
maintaining stability post-installation through osseointegration
Data Source
AI summary
A system and method for further improving upon an ability of a surgeon to reduce or eliminate impaction forces when installing or assembling a prosthesis. An implant includes a surface treatment for aiding operations with the implant. For example, some surface treatments provide an asymmetry in installation versus removal to bias the associated implant deeper into an installation site.