Composite Bone Graft Core-Outer Layer Structure

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Solution Overview

Problem

Current bone grafts used in spinal fusion procedures are not optimal, as synthetic grafts are inadequate and natural autologous grafts are limited in supply, while cadaveric or allograft grafts carry disease transmission risks and often collapse or resorb too quickly, failing to adequately promote bone growth and fusion.

Innovation Solution

A composite bone graft combining an allograft bone component with a synthetic bone substitute, optionally encased in a mesh, where the synthetic component can be beta-tricalcium phosphate or hydroxyapatite, and infused with additives like platelet-rich plasma or stem cells, to promote controlled resorption and bone regeneration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If allograft bone is used, then bone growth promotion is improved, but disease transmission risk increases and resorption rate increases

Engineering Contradiction:

Improvebone growth promotionVSAvoiddisease transmission risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A barrier membrane is introduced as an intermediary between the allograft bone and the external environment. This membrane selectively allows beneficial bone growth factors to pass through while blocking harmful pathogens and preventing excessive resorption, thus resolving the contradiction between promoting bone growth and preventing disease transmission

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The chemical and physical parameters of the allograft bone are modified through controlled processing methods (such as freeze-drying, sterilization, or chemical treatment) to reduce immunogenicity and disease transmission risk while preserving osteoinductive properties, allowing safe use without disease transmission

Inventive Principle:

Principle #35Parameter changes

2Reliability

If allograft bone is used, then bone growth promotion is improved, but structural stability deteriorates due to quick collapse and resorption

Engineering Contradiction:

Improvebone growth promotionVSAvoidstructural stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The allograft bone is combined with synthetic bone substitutes (such as calcium phosphate ceramics or polymer-based materials) to create a composite graft. The synthetic component provides structural stability and controlled porosity, while the allograft component promotes bone growth, thus resolving the contradiction between bone growth promotion and structural stability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Different regions of the bone graft are assigned different properties: the outer shell uses synthetic material for structural support and controlled resorption, while the inner core contains allograft bone for enhanced bone growth promotion, creating a functionally optimized composite structure

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If synthetic bone substitute is used, then structural stability is improved, but bone growth promotion deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidbone growth promotion

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The synthetic bone substitute is designed with controlled porosity and interconnected pore structures that mimic natural bone architecture. This allows bone ingrowth, vascularization, and nutrient transport while maintaining structural stability, thus resolving the contradiction between structural stability and bone growth promotion

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The synthetic bone substitute is combined with allograft bone components or osteoinductive factors (such as BMPs) to create a composite that provides both structural support and enhanced bone growth promotion capabilities

Inventive Principle:

Principle #40Composite materials

4Reliability

If natural autologous bone graft is used, then bone growth promotion is improved, but availability deteriorates due to limited supply

Engineering Contradiction:

Improvebone growth promotionVSAvoidavailability

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Processed allograft bone materials are used as a disposable alternative to autologous bone. These pre-processed allografts are designed for single-use in surgical procedures, providing reliable bone growth promotion without the need for secondary harvesting surgery, thus resolving the availability constraint

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 composite bone graft provides a stronger construct with slower resorption and improved bone formation, encouraging stem cell differentiation and vascularization, thereby enhancing spinal fusion stability and longevity.

Implementation Method 1

controlled resorption of the matrix

Methodology Applied

Scientific EffectResorption: Decomposition (biological)

Implementation Method 2

encouraging stem cell differentiation and vascularization, thereby enhancing spinal fusion stability and longevity

Methodology Applied

Scientific EffectStem cell differentiation:

Implementation Method 3

the additive is one or more of platelet rich plasma, bone marrow aspirate, stem cells or other additive

Methodology Applied

Scientific EffectPlatelet-rich plasma:

Data Source

PatentUS8926699B2Composite bone graft kit

Publication Date: 2015.01.06 SPINESMITH PARTNERS LP

AI summary

A composite bone graft which comprises an allograft bone component; a synthetic bone substitute, wherein the synthetic bone substitute is in contact with the allograft bone component. The composite is arranged in a core/outer layer structure.