Spinal Fusion Implant Laser-Modified Surface Osteoinductivity
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Solution Overview
Problem
Existing spinal fusion devices lack effective features to enhance new bone growth and fusion between adjacent vertebrae, relying primarily on mechanical stabilization and bone grafts.
Innovation Solution
The implant device features internal and external facet features with inclined surfaces that facilitate laser engraving, creating a nano-scale modified network on the implant surfaces to enhance osteoinductivity and promote bone ingrowth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional mechanical support systems are used for spinal fusion, then structural stability is provided, but bone growth stimulation is insufficient
Solution Approach 1:
The implant incorporates localized osteoinductive features including porous structures, roughened surfaces, and apatite-coated regions at specific locations where bone contact occurs. These local modifications create zones of enhanced osteoconductivity and osteoinductivity without compromising the overall mechanical strength of the implant body, thereby resolving the contradiction between structural stability and bone growth stimulation.
Solution Approach 2:
The implant utilizes composite material structures combining metal alloys (for mechanical strength) with bioactive coatings such as hydroxyapatite, tricalcium phosphate, or collagen matrices (for bone growth promotion). This composite approach allows the implant to simultaneously provide structural support and stimulate reliable bone fusion through multiple mechanisms including osteoconduction, osteoinduction, and osseointegration.
2Reliability
If bone graft material is added to enhance bone growth, then osteoinductivity is improved, but device complexity increases
Solution Approach 1:
The invention integrates osteoinductive bone graft materials directly into the implant structure itself, merging the support function and the bone stimulation function into a single unified device. The implant body incorporates porous regions, coated surfaces, or embedded growth factors that provide osteoinductivity without requiring separate bone grafting procedures or additional components, thereby improving reliability while minimizing device complexity.
Solution Approach 2:
The implant is designed with self-service osteoinductive capabilities through incorporated bioactive materials, growth factors, or osteogenic cells that actively stimulate bone formation autonomously. This self-service approach eliminates the need for external bone graft harvesting or additional surgical interventions, enhancing osteoinductivity while keeping the device design relatively simple and straightforward.
3Reliability
If laser engraving is applied to enhance osteoinductivity, then bone growth is promoted, but manufacturing precision requirements increase
Solution Approach 1:
The laser engraving process parameters (power, speed, pulse duration, wavelength) are optimized to create effective osteoinductive surface features at relatively low precision thresholds. By adjusting these parameters, the process generates micro-roughness, porous structures, or specific geometric patterns that promote bone growth without requiring ultra-precise control, thereby achieving reliable bone growth promotion while maintaining feasible manufacturing precision standards.
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 laser-modified network with nano-scale features on the implant surfaces significantly enhances new bone growth and fusion, providing improved stability and integration with the surrounding bone tissue.
Implementation Method 1
A femtosecond laser is an infrared laser that emits bursts of laser energy at an extremely fast rate. A femtosecond laser has a pulse duration in the femtosecond range, or one quadrillionth of a second.
Data Source
AI summary
An implant device has an improved osteoinductive feature to enhance new bone formation. The implant device has a body structure having a superior or first surface and an inferior or second surface and one or more facet features. One or more exterior and interior side surfaces extend between the superior and inferior surfaces. The one or more facet features extend from the internal side surfaces. Each of the facet features is inclined off parallel relative to the exterior side surface or off perpendicular relative to the superior and inferior surfaces at an angle which provides a surface to facilitate laser modification along the facet feature when a laser beam is oriented at an angle generally perpendicular to the load bearing inferior or superior surface.