Self-detaching bone implant coating for easy removal
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Solution Overview
Problem
Current bone implants, especially those made of biocompatible alloys like Titanium-Aluminum-Niobium, integrate too well with surrounding tissue, making their removal more invasive and damaging than necessary, as they hinder easy detachment after healing.
Innovation Solution
A coated bone implant system featuring a soluble or biodegradable first layer and a biocompatible second layer, applied via techniques like dip or spray coating, creates a self-detaching barrier that prevents tissue integration without impeding healing, allowing for easier removal after a predefined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biocompatible alloy implants (e.g., Ti-Al-Nb) are used to ensure favorable healing and tissue integration, then the healing process is improved and tissue integration is enhanced, but the implant becomes difficult to remove and causes more invasive and damaging removal procedures
Solution Approach 1:
The coating system is segmented into multiple functional layers: a first biocompatible layer (e.g., hydroxyapatite) that promotes bone on-growth and healing, and a second soluble or biodegradable layer (e.g., polylactide, polyglycolide) that acts as a temporary barrier. This segmentation allows the implant to fulfill its healing function while enabling easier removal through dissolution of the outer layer.
Solution Approach 2:
The soluble outer layer is applied in advance as a protective barrier that pre-prevents tissue integration with the implant surface. This preliminary action allows the implant to be removed after a predefined time by simply dissolving or degrading the outer layer, avoiding invasive removal procedures.
2Ease of operation
If a coating layer is applied to prevent tissue integration and enable easy removal, then the ease of implant removal is improved, but the coating complexity and manufacturing process are increased
Solution Approach 1:
The coating system utilizes parameter changes in material properties: the first layer provides biocompatibility and bone integration, while the second layer changes from an intact barrier to a dissolved state over time through biodegradation. This parameter change enables automatic detachment without complex mechanical release mechanisms.
Solution Approach 2:
The implant coating combines different materials with complementary properties: a biocompatible material (hydroxyapatite, titanium oxide) for bone integration and a biodegradable polymer (polylactide, polyglycolide) for temporary protection and easy removal. This composite structure achieves both healing promotion and easy removal functionality.
3Ease of operation
If a thick soluble layer is used to ensure complete tissue shielding and easy removal, then the ease of implant removal is improved, but the time required for complete resorption and the volume of material in the body are increased
Solution Approach 1:
The coating thickness is optimized locally: the first biocompatible layer has a thickness sufficient to promote bone on-growth (e.g., 1-10 μm), while the second soluble layer has a controlled thickness (e.g., 100 nm to 10 μm) that provides adequate protection but resorbs within an acceptable time frame (weeks to months). This local quality optimization balances protection duration with resorption time.
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 coated implant facilitates less invasive and damaging removal by forming a biocompatible shield that detaches from tissue, ensuring favorable healing and minimizing adverse effects during implant removal.
Implementation Method 1
a first layer having a thickness D comprising a material which is water-soluble or degradable in body fluids
Implementation Method 2
a first layer having a thickness D comprising a material which is water-soluble or degradable in body fluids
Implementation Method 3
An exemplary coating according to the present invention may be carried out by a variety of techniques, including dip or spray coating and physical or chemical vapor deposition (PVD/CVD)
Implementation Method 4
An exemplary coating according to the present invention may be carried out by a variety of techniques, including dip or spray coating and physical or chemical vapor deposition (PVD/CVD)
Data Source
AI summary
A bone implant includes (a) a first layer provided over a first outer surface of the bone implant and being formed of a first material which is one of water-soluble and degradable in body fluids, the first layer having a first thickness and (b) a second layer provided over an outer periphery of the first layer and being formed of a biocompatible material, the second layer having a second thickness smaller than the first thickness.