Biodegradable Nanocomposite Bone Screws With Mechanical Strength
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Solution Overview
Problem
Existing surgical implants, such as metal, alloy, polymeric, and ceramic implants, face issues with non-biodegradability, mechanical strength, and compatibility with surrounding tissues, requiring additional surgeries for removal, which are costly and risky.
Innovation Solution
A biodegradable nanocomposite made from organic sources like date seeds, pomegranate peels, and camel bone, combined with polymers and organic dyes, providing mechanical strength and biocompatibility, allowing for implants like screws and plates to degrade naturally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If synthetic implants (metal, alloy, ceramic) are used, then mechanical strength is improved, but biodegradability deteriorates requiring secondary surgery for removal
Solution Approach 1:
The patent employs composite materials combining biodegradable polymers (PLA, PGA, PLGA) with natural bone particles and ceramic particles to create an implant that simultaneously achieves mechanical strength comparable to synthetic implants and biodegradability. The composite structure allows the polymer matrix to provide tensile strength while the bone and ceramic particles contribute compressive strength and osteoconductivity, enabling the implant to degrade naturally after serving its mechanical function.
2Duration of action of moving object
If polymeric implants are used, then biodegradability is improved, but mechanical strength deteriorates compared to synthetic implants
Solution Approach 1:
The patent enhances the mechanical strength of biodegradable polymers by incorporating natural bone particles and ceramic particles as reinforcement. The bone particles contribute collagen and mineral content that improve compressive strength and osteoconductivity, while the ceramic particles add hardness and wear resistance. This composite approach allows the polymeric implant to maintain sufficient mechanical strength during the healing period while retaining its biodegradable特性.
Solution Approach 2:
The patent applies different materials with specific properties to different regions or functions within the implant structure. The polymer matrix provides flexibility and biodegradability, while embedded bone particles provide osteoconductivity and structural reinforcement, and ceramic particles provide hardness and wear resistance. This local differentiation of material properties allows the implant as a whole to overcome the limitations of pure polymeric materials.
3Duration of action of moving object
If ceramic implants are used, then biodegradability and biocompatibility are improved, but mechanical strength and wear resistance deteriorate
Solution Approach 1:
The patent creates a composite system where ceramic particles are dispersed within a polymeric matrix combined with natural bone particles. The ceramic particles provide localized hardness and wear resistance where needed, while the polymeric matrix and bone particles provide the overall structural framework and biodegradability. This composite approach allows ceramic materials to contribute their advantageous properties without suffering from their inherent brittleness and limited biodegradability when used alone.
Solution Approach 2:
The patent uses ceramic particles as discrete reinforcement elements distributed throughout the polymeric matrix, allowing ceramic properties (hardness, wear resistance) to be localized to specific regions within the implant where these properties are most needed, while the bulk material maintains its biodegradability and flexibility through the polymeric matrix.
4Duration of action of moving object
If magnesium alloy implants are used, then biodegradability and biocompatibility are improved, but mechanical strength and brittleness deteriorate
Solution Approach 1:
The patent replaces magnesium alloy with a composite system consisting of biodegradable polymers (PLA, PGA, PLGA) reinforced with natural bone particles and ceramic particles. This composite approach achieves comparable mechanical strength to magnesium alloy while maintaining biodegradability and adding osteoconductivity through the bone particles. The polymer matrix provides ductility and toughness that magnesium alloy lacks, preventing catastrophic failure during degradation.
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 nanocomposite implants offer superior mechanical strength, biocompatibility, and eliminate the need for secondary surgeries, reducing patient risk and cost by naturally degrading over time.
Implementation Method 1
converting, by acid hydrolysis in 90% hydrogen sulfate, camel knee bone to nanoparticles
Implementation Method 2
pyrolyzing, by an oven, an amount of pomegranate peel; converting, by acid hydrolyzing in 88% hydrochloric acid, the pyrolyzed pomegranate peel to nanoparticles
Data Source
AI summary
A nanocomposite derived from organic sources, including waste date seeds, pomegranate peels and camel knee bone. The nanocomposites can be used for the synthesis of surgical implants, are biodegradable, and do not require surgery for their removal. The nanocomposites contain nanoparticles of date seeds, pomegranate peels, camel knee bone, polymers, organic substances, and organic dyes. A method for the preparation of the nanocomposites includes molding the nanocomposites into organic bone screws, bone plates, and dental prosthetics.