Bioabsorbable Intramedullary Nail With Nanofiber Scaffold for Bone Union

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Solution Overview

Problem

Current treatments for critical-size bone defects, such as autologous bone grafting and metallic intramedullary nail systems, are unsatisfactory due to multiple surgeries, high infection risk, and prolonged recovery times, lacking a standardized method that promotes bone union and allows weight bearing during healing.

Innovation Solution

A bioresorbable, osteoconductive, and osteoinductive repair apparatus comprising a biologic nanofiber mesh wrapped around a bioabsorbable intramedullary nail, which can be used with or without screws, to stabilize bone fragments and promote natural bone regeneration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If autologous bone grafting with metallic intramedullary nail systems is used, then bone defects can be treated, but multiple surgeries are required and recovery time is prolonged

Engineering Contradiction:

Improvebone defect treatment effectivenessVSAvoidrecovery time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The device is segmented into multiple functional components: a bioabsorbable intramedullary nail for structural support, a porous scaffold for bone ingrowth, and growth factors for biological activation. This segmentation allows each component to perform its specific function optimally while enabling progressive bone regeneration without requiring multiple surgeries.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The device is pre-loaded with growth factors and designed to degrade progressively over time, releasing therapeutic substances before the bone fully regenerates. This preliminary preparation of biological activity accelerates the healing process and eliminates the need for subsequent surgical interventions to remove metallic implants or perform additional grafting.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If metallic intramedullary nail systems are used, then bone fragments can be stabilized, but infection risk increases

Engineering Contradiction:

Improvebone fragment stabilityVSAvoidinfection risk

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The material composition is changed from permanent metallic alloys to bioabsorbable polymers or metals that gradually degrade. This parameter change in material properties maintains initial mechanical stability while eliminating the permanent foreign body that promotes infection, as the implant is progressively replaced by native bone tissue.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The intramedullary nail and scaffold are designed as temporary, bioabsorbable structures that complete their stabilizing function and then naturally degrade. This approach replaces the need for permanent metallic implants with a temporary solution that eliminates infection risk once bone regeneration is complete, similar to the concept of disposable medical devices.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If bioresorbable intramedullary nail and scaffold are used, then recovery time is reduced and weight bearing is allowed, but the device complexity increases

Engineering Contradiction:

Improvehealing speedVSAvoiddevice structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The device merges multiple functions into a single integrated structure: the intramedullary nail provides structural stabilization, the porous scaffold provides surface area for bone ingrowth, and the growth factor coating provides biological stimulation. This combination achieves accelerated healing without requiring multiple separate devices or procedures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The device utilizes composite material structures combining bioabsorbable polymers, porous ceramics, and biological molecules (growth factors). This composite approach integrates mechanical support, biological activity, and structural porosity into a single device, achieving enhanced healing capabilities while managing complexity through materials science rather than mechanical complexity.

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

The apparatus reduces recovery time by allowing biodegradation and creep substitution with regenerative bone tissue, minimizing the need for additional surgeries and promoting effective bone healing.

Implementation Method 1

Developing bioresorbable bone substitutes that have strength characteristics similar to cortical bone strength and have osteoinductive properties

Methodology Applied

Scientific EffectOsteoconduction:

Implementation Method 2

Developing bioresorbable bone substitutes that have strength characteristics similar to cortical bone strength and have osteoinductive properties

Methodology Applied

Scientific EffectOsteoinduction:

Implementation Method 3

The bioabsorbable nanofiber mesh scaffold spans the distance between the ends of bone fragments in a critical size defect... allowing creep substitution with regenerative bone tissue

Methodology Applied

Scientific EffectBiodegradation:

Data Source

PatentUS20260000514A1Bone defect repair apparatus

Publication Date: 2026.01.01 UNIVERSITY OF CENTRAL OKLAHOMA

AI summary

A repair apparatus for repairing bone defects comprises an intramedullary nail extending into spaced apart first and second bone fragments of the bone defect through the ends thereof. A nanofiber mesh scaffold is disposed about the intramedullary nail and positioned between the ends of the first and second bone fragments.