Biodegradable Sleeve Inducing Scaffold Strain for Bone Healing
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Solution Overview
Problem
Current methods for treating critical-sized bone defects in humans and veterinary patients face challenges such as inadequate mechanical strength of osteogenic scaffolds, leading to complications like screw loosening, plate fracture, and infection, with existing solutions requiring permanent metal fixation and resulting in poor healing outcomes and limb loss.
Innovation Solution
A biodegradable sleeve and scaffold system is used, where the sleeve is designed to induce strain on the scaffold, enhancing bone remodeling and vascularization, and is coupled with a fixation member to support load-bearing, while being made of materials like polycaprolactone and calcium phosphate for biodegradability and osteoconductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If osteogenic scaffolds made with biomaterials like hydroxyapatite and beta-tri-calcium phosphate are used to enhance bone growth, then osteogenic capability is improved, but mechanical strength and load-bearing capability deteriorate
Solution Approach 1:
The patent combines osteogenic scaffolds made of brittle biomaterials (hydroxyapatite, beta-tri-calcium phosphate) with a separate load-bearing component (metal implant or polymer-reinforced scaffold). The osteogenic scaffold provides bone regeneration capability while the load-bearing component provides mechanical strength, and both work together as an integrated system to solve the contradiction between osteogenic capability and mechanical strength.
Solution Approach 2:
The patent uses composite material structures where osteogenic scaffolds (hydroxyapatite, beta-tri-calcium phosphate) are combined with load-bearing materials (metals or polymer-reinforced composites). This creates a composite system that exhibits both excellent osteogenic properties and sufficient mechanical strength for load-bearing applications.
2Strength
If permanent metal fixation with large metal plates and endoprostheses is used to provide load-bearing capability, then mechanical strength is improved, but biodegradability and long-term complications worsen
Solution Approach 1:
The patent segments the fixation system into separate functional components: a load-bearing component (metal implant or polymer-reinforced structure) and an osteogenic scaffold component. This segmentation allows each component to perform its specific function optimally while being replaceable or biodegradable, avoiding the need for a single permanent implant to fulfill all functions.
Solution Approach 2:
The patent changes the material parameters of the load-bearing component from permanent metal to biodegradable or replaceable materials. The load-bearing component can be made of biodegradable polymers, metal alloys designed for controlled degradation, or structures that can be removed after bone healing, thereby reducing long-term complications associated with permanent foreign materials.
3Reliability
If scaffold porosity is increased to enhance bone ingrowth, then osteoconductivity is improved, but structural strength and stiffness deteriorate
Solution Approach 1:
The patent merges the osteogenic scaffold with a separate load-bearing component. The scaffold can have high porosity (60-90%) to maximize osteoconductivity and bone ingrowth, while the load-bearing component provides the necessary structural strength and stiffness. This merging allows both high porosity and adequate strength to coexist in the overall construct.
Solution Approach 2:
The patent applies different structural qualities to different parts of the implant system. The osteogenic scaffold portion has high porosity for optimal bone ingrowth and osteoconductivity, while the load-bearing portion has lower porosity and higher density to provide structural strength. Each region is optimized for its specific function, resolving the contradiction between porosity and strength.
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 system facilitates accelerated bone healing by inducing micromotion and improving mechanical strength, allowing for complete bone regeneration and removal of foreign materials, reducing complications and improving functional outcomes.
Implementation Method 1
a geometry of the biodegradable sleeve induces strain on a portion of the biodegradable scaffold when a force is applied to the biodegradable sleeve
Implementation Method 2
positioning the biodegradable sleeve along the first bone structure and the second bone structure to span the bone defect
Data Source
AI summary
Various implementations include a method for treating a bone defect of a first bone structure and a second bone structure of a patient. The method includes positioning a biodegradable scaffold within a passage of a biodegradable sleeve, wherein the passage extends from a first end to a second end of the biodegradable sleeve, wherein a geometry of the biodegradable sleeve induces strain on a portion of the biodegradable scaffold when a force is applied to the biodegradable sleeve; and positioning the biodegradable sleeve along the first bone structure and the second bone structure to span the bone defect.