Multi-Phasic Biodynamic Scaffold for Bone Defect Repair

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Solution Overview

Problem

Current methods for treating bone defects lack an optimal delivery of osteoconductive, osteoinductive, osteogenic, and mechanical stability properties, leading to inadequate bone reconstruction and remodeling.

Innovation Solution

A multi-phasic biodynamic scaffold composed of hydroxyapatite, a calcium salt, and an antiresorptive agent, such as zoledronic acid, is used in combination with bone graft material to treat bone defects by providing alternating layers of the scaffold and bone graft material at the defect site.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If allograft bone is used for bone reconstruction, then osteoinductive properties are provided, but mechanical stability is insufficient and bone remodeling capacity is limited

Engineering Contradiction:

Improveosteoinductive propertiesVSAvoidmechanical stability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent combines allograft bone with calcium sulfate and hydroxyapatite to create a composite bone reconstruction material. The calcium sulfate provides mechanical support and rapid strength, while hydroxyapatite offers osteoinductive properties and gradual resorption. This composite approach allows simultaneous achievement of mechanical stability and biological activity that neither material could provide alone.

Inventive Principle:

Principle #40Composite materials

2Strength

If bone cement (PMMA) is used for bone reconstruction, then mechanical stability is provided, but bone formation is completely prevented

Engineering Contradiction:

Improvemechanical stabilityVSAvoidbone formation capacity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the material parameters from synthetic PMMA to natural bone-derived materials (calcium sulfate, hydroxyapatite, allograft bone) that exhibit different degradation and biological interaction properties. These materials provide mechanical strength initially but gradually resorb and allow bone formation over time, transforming the permanent mechanical support into a temporary scaffold that facilitates biological regeneration.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional bone graft substitutes are used, then osteoconductive properties are provided, but resorption is delayed or absent which blocks bone ingrowth and formation

Engineering Contradiction:

Improveosteoconductive propertiesVSAvoidresorption time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent changes the resorption parameter of bone graft substitutes by selecting calcium sulfate and hydroxyapatite over synthetic materials like PMMA. These natural bone minerals exhibit controlled resorption rates that match bone formation rates, allowing progressive replacement by new bone tissue while maintaining osteoconductive properties throughout the healing process.

Inventive Principle:

Principle #35Parameter changes

4Ease of operation

If a single bone graft material is used, then simplicity of application is maintained, but optimal delivery of all four properties (osteoconductive, osteoinductive, osteogenic, mechanical stability) cannot be achieved

Engineering Contradiction:

Improvesimplicity of applicationVSAvoidoptimal delivery of bone reconstruction properties

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent employs a composite formulation of calcium sulfate, hydroxyapatite, and allograft bone that can be mixed and applied as a single material combination. This composite approach delivers all four essential properties simultaneously: mechanical strength from calcium sulfate, osteoconduction from hydroxyapatite, and osteoinduction from allograft bone proteins, while maintaining relative ease of application through simple mixing and placement.

Inventive Principle:

Principle #40Composite materials

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

This approach enhances mechanical stability and promotes undisturbed biological healing, physiological remodeling, and regeneration of bone, leading to effective bone reconstruction and growth of healthy bone at the defect site.

Implementation Method 1

The three principal factors beneficial for the treatment of any bone defect regardless of its etiology, namely osteoconductive, osteoinductive and osteogenetic properties have been known for decades

Methodology Applied

Scientific EffectOsteoconduction:

Implementation Method 2

Systemic administration of bisphosphonates, in this context, is well known to strongly inhibit osteoclast mediated bone destruction in primary and secondary bone tumors

Methodology Applied

Scientific EffectOsteoclast inhibition:

Implementation Method 3

The three principal factors beneficial for the treatment of any bone defect regardless of its etiology, namely osteoconductive, osteoinductive and osteogenetic properties have been known for decades

Methodology Applied

Scientific EffectOsteoinduction:

Data Source

PatentEP3359209B2Compositions and methods for treatment of bone defects

Publication Date: 2025.06.18 HETTWER HLDG APS

Figure 1A~1C
Figure 2A~2D
Figure 3A~3C

AI summary

The present invention relates to the field of treatment of bone defects. The invention provides a composition for treatment of bone defects as well as methods for treatment of such defects.