Osteoconductive Polymer Surface Coating with Exposed Ceramic Particles
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Solution Overview
Problem
Existing methods for creating polymer articles for medical implants struggle to provide a surface that is both bioactive and allows osseointegration without significantly affecting the bulk polymer properties or requiring lengthy post-treatments.
Innovation Solution
A method involving the use of a biocompatible, non-biodegradable polymer with a textured surface and bioactive ceramic particles of specific size embedded in the surface through a solvent-based coating process, ensuring the particles are partly embedded and accessible for interaction with tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ceramic particles are fully embedded in the polymer matrix, then the polymer composite shows improved stiffness and strength, but the ceramic particles are not available at the surface for interacting with tissue
Solution Approach 1:
The patent applies different embedding depths to ceramic particles at different locations within the polymer matrix. Particles in the bulk remain fully embedded for reinforcement, while particles at the surface are partially exposed to enable tissue interaction. This spatial differentiation of particle embedding quality resolves the contradiction between internal strength and surface bioactivity.
Solution Approach 2:
The patent segments the ceramic particles into different functional groups based on their embedding state: fully embedded particles provide mechanical reinforcement, while partially exposed particles provide bioactive surface interaction. This segmentation allows simultaneous optimization of both strength and bioactivity functions.
2Reliability
If selective etching of polymer surface is performed to expose ceramic particles, then bioactivity is improved, but additional treatment steps and polymer degradation are required
Solution Approach 1:
The patent incorporates the bioactive ceramic particles into the polymer matrix during the initial formation process, with particles positioned at the surface in a partially embedded state. This preliminary action eliminates the need for subsequent selective etching treatments, reducing process complexity while maintaining bioactivity.
Solution Approach 2:
The patent extracts the need for separate surface etching treatments by directly incorporating exposed ceramic particles into the polymer matrix during formation. The surface exposure is achieved through controlled particle embedding during matrix formation rather than through post-formed etching processes.
3Reliability
If polymer surface is roughened to enhance osseointegration, then bone growth is improved, but the surface roughness may affect polymer mechanical properties
Solution Approach 1:
The patent creates surface roughness through the partial embedding of ceramic particles at the polymer surface, while maintaining the bulk polymer matrix as homogeneous and intact. The roughness is localized to the surface layer where it promotes osseointegration, without compromising the mechanical properties of the bulk polymer material.
Solution Approach 2:
The patent uses a composite structure where ceramic particles are partially embedded in the polymer matrix at the surface. This composite approach allows the ceramic particles to create surface roughness for bone growth while the polymer matrix maintains its mechanical integrity, combining the benefits of both materials without compromising either.
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 method results in a polymer article with a bioactive surface that supports osseointegration, maintaining the polymer's bulk properties and avoiding the need for additional treatments, with ceramic particles accessible for direct interaction with bodily fluids and tissues.
Implementation Method 1
a method involving the use of a biocompatible, non-biodegradable polymer with a textured surface and bioactive ceramic particles of specific size embedded in the surface through a solvent-based coating process
Implementation Method 2
embedded in the surface through a solvent-based coating process, ensuring the particles are partly embedded and accessible for interaction with tissue
Data Source
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AI summary
The disclosure relates to methods of making an osteoconductive polymer article for use as an orthopedic implant comprises steps of forming an article from a biocompatible, non-biodegradable polymer, the article comprising a non-flat surface with roughness Ra of at least 5 µm; providing a dispersion of bioactive ceramic particles of particle size at most 10 µm in a first solvent comprising a solvent for the polymer; coating at least the non-flat surface with the dispersion in at least one step; and rinsing the coated article with a second solvent being a non-solvent for the polymer to substantially remove the first solvent. Further disclosed is an osteoconductive polymer article for use as an orthopedic implant, which article is made from a biocompatible, non-biodegradable polymer and comprises a non-flat surface with roughness Ra of at least 5 µm, wherein bioactive ceramic particles of particle size at most 10 µm are partly embedded in the polymer at the surface of the article. The methods exhibit benefits in ease of modifying a surface layer with bioactive particles, applying mild conditions and not requiring use of further additives or post-treatments, or without significantly affecting bulk polymer properties, and result in an orthopedic implant article having particles adhering to the surface while still being accessible for interaction with surrounding tissue or fluid.