Collagen-Coated Bone Implant with Porous Surface Retention
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Solution Overview
Problem
Existing medical implants, particularly those used in spinal applications, face challenges in achieving adequate adhesive strength and preventing the removal of collagen coatings during installation due to abrasive action with bone, which hinders effective bone ingrowth and integration.
Innovation Solution
A collagen-coated medical implant is developed, where collagen is applied using methods like spraying, dipping, or electrostatic application to ensure secure attachment and promote bone growth, with the implant being constructed from biocompatible materials such as titanium or PEEK, and incorporating features like porous surfaces and channels to retain the coating during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collagen coating is applied to the implant surface to promote bone ingrowth, then bone integration is enhanced, but the coating is removed during installation due to abrasive action with bone
Solution Approach 1:
The patent applies collagen to the implant surface before insertion, and uses a protective sleeve or channel structure to shield the collagen coating during the insertion process. This preliminary protective action prevents the abrasive bone from contacting and removing the collagen coating during installation, while still allowing the collagen to promote bone ingrowth at the intended site.
2Ease of operation
If the implant surface is made smooth to reduce friction during insertion, then ease of operation is improved, but bone ingrowth is hindered
Solution Approach 1:
The patent divides the implant surface into different functional zones: a smooth insertion surface that reduces friction during insertion, and a porous or textured bone-contact surface that promotes bone ingrowth. This segmentation allows each surface to optimize its specific function without compromising the other.
Solution Approach 2:
The patent applies different surface properties to different locations on the implant. The insertion surface maintains smoothness for ease of operation, while the bone-contact surface features porosity or roughness to promote bone ingrowth. This local differentiation of surface quality resolves the contradiction between insertion ease and bone integration.
3Strength
If the implant is made rigid to provide structural support, then load-bearing capacity is improved, but bone absorption and replacement is prevented
Solution Approach 1:
The patent uses titanium, a biocompatible material that undergoes controlled degradation over time. The implant maintains its rigid load-bearing structure during the initial healing phase, then gradually allows bone absorption and replacement as the titanium degrades at a controlled rate, ultimately being fully replaced by bone tissue.
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 collagen coating enhances bone integration and growth, providing a strong attachment mechanism that prevents shifting of the implant and encourages bone intrusion into the implant surface, thereby ensuring long-term stability and replacement as the implant is absorbed.
Implementation Method 1
collagen is applied using methods like spraying, dipping, or electrostatic application
Implementation Method 2
incorporating features like porous surfaces and channels to retain the coating during insertion
Data Source
AI summary
The invention herein relates to the field of attaching and securing manmade material onto or into bone in correcting bone defects by implanting stress-bearing bone replacements. In particular, the invention relates to applying a coating of collagen securely onto the implant to ensure the collagen material will not be removed from the implant during installation, such as screwing the anchor into the bone. This addresses the removal of the coatings by the scraping action of the bone on the soft collagen. In the past, it has not been possible to provide adequate adhesive strength to the bone collagen/implant interface or the cohesive force of the collagen itself to prevent the removal of the coating by the abrasive action between bone and known implants.