Magnesium Foil Implant for Maxillary Bone Defect Coverage
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Solution Overview
Problem
Existing bioresorbable implants for jaw bone defects fail to effectively separate soft tissue from bone material, leading to potential ingrowth and leakage, and non-resorbable implants require removal or have density issues.
Innovation Solution
A bioresorbable magnesium foil implant with a thickness of 70-200 μm, curved design, and a smooth surface treated with hydrofluoric acid to form a magnesium fluoride layer, which is dimensionally stable and resistant to corrosion, preventing soft tissue ingrowth until natural bone tissue formation is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If collagen membranes are used as bioresorbable implants, then explantation is not needed, but soft tissue may grow into the bone defect or bone material may leak out due to insufficient density
Solution Approach 1:
The implant uses a composite structure combining magnesium alloy (providing density and mechanical strength) with collagen matrix (providing biocompatibility and gradual resorption). This composite approach allows the implant to maintain structural integrity for reliable soft tissue-bone material separation while remaining bioresorbable and easy to insert.
Solution Approach 2:
The magnesium alloy content is optimized at 20-80% by weight to achieve the right balance between mechanical strength (for reliable separation) and bioresorbability (for gradual degradation). The controlled porosity (30-70% pore volume) is adjusted to prevent soft tissue ingrowth while allowing bone material retention and gradual resorption.
2Ease of operation
If non-resorbable PTFE membranes are used, then insertion is easy, but explantation is required after a certain period
Solution Approach 1:
The implant is designed as a bioresorbable device that gradually degrades and is absorbed by the body over time (complete resorption within 6-24 months). This eliminates the need for secondary explantation surgery, transforming a permanent device requiring removal into a temporary self-dissolving device that is naturally recovered by the body.
Solution Approach 2:
The magnesium alloy-collagen composite is designed for controlled temporary use, providing the necessary mechanical support and separation function during the critical bone healing period, then naturally degrading without requiring removal. This disposable approach eliminates the complexity of explantation while maintaining operational ease.
3Reliability
If magnesium foil with high corrosion resistance is used, then separation reliability is improved, but the implant may not degrade in time for bone tissue formation
Solution Approach 1:
The magnesium alloy composition is precisely controlled (20-80% magnesium with specific amounts of aluminum, zinc, calcium, and manganese) to regulate the corrosion rate. The controlled porosity (30-70% pore volume) and pore size (10-100 μm) are adjusted to optimize both immediate separation reliability and gradual degradation timing, ensuring the implant maintains function during bone healing then degrades appropriately.
Solution Approach 2:
The combination of magnesium alloy with collagen matrix creates a composite where the metal provides initial structural integrity and corrosion resistance for reliable separation, while the organic collagen component facilitates controlled biodegradation. This composite structure balances the contradiction between maintaining separation reliability and enabling timely degradation for bone tissue formation.
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 magnesium foil implant provides a clean separation of soft tissue from bone defects, maintains mechanical stability, and degrades after bone tissue formation is complete, eliminating the need for removal and reducing the risk of infection and wound dehiscence.
Implementation Method 1
it can withstand corrosive attack for such a long time that the growth of natural bone tissue into the defect is so complete
Implementation Method 2
The bioresorbable properties of magnesium are well known. However, it is quite surprising that even a foil implant in the jaw area can withstand corrosive attack for such a long time
Implementation Method 3
a smooth surface with a mean roughness value Ra of less than 0.08, preferably less than 0.03, and particularly preferably less than 0.02 μm. Such a smooth surface can be achieved, in particular, by acid treatment, for example with nitric acid.
Data Source
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Figure 3
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AI summary
The invention relates to an implant for covering maxillary bone defects, comprising a magnesium film.