Porous Implant Insert with Hydroxyapatite Coating for Bone Integration
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Solution Overview
Problem
Current porous implants for bone growth in load-bearing applications lack effective integration with surrounding bone tissue and require additional fasteners for secure attachment, which can complicate the healing process and reduce the implant's longevity.
Innovation Solution
A porous insert with a metal framework coated with hydroxyapatite and biologics, such as demineralized bone matrix and bone morphogenetic proteins, is selectively coupled to an implant using a retaining structure that allows for tissue ingrowth and mechanical strength, eliminating the need for auxiliary fasteners by providing a secure press-fit attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous material is coated on the exterior surface of a prosthetic implant to encourage bone ingrowth, then bone integration is improved, but additional fasteners are required for secure attachment which complicates the healing process
Solution Approach 1:
The porous coating and the implant body are merged into a single integrated structure. The porous material is not merely coated on the surface but is formed as an integral part of the implant, combining the structural function with the bone-ingrowth promotion function in one unified component.
Solution Approach 2:
The implant utilizes composite material structure combining a dense structural core with a porous outer layer. This composite approach allows the implant to simultaneously provide mechanical strength from the dense core and bone integration capability from the porous surface layer.
2Strength
If additional fasteners are used to secure the porous coating to the implant, then mechanical strength is improved, but the healing process is complicated and implant longevity is reduced
Solution Approach 1:
The fasteners are extracted/removed from the system. Instead of using separate fastening components to attach the porous coating, the design achieves secure attachment through the integrated porous structure itself, eliminating the need for additional fasteners that would complicate the healing process.
Solution Approach 2:
The porous structure is pre-configured with attachment features during manufacturing. The retaining structures and press-fit geometries are built into the porous implant itself before implantation, allowing for secure attachment without requiring additional fasteners to be added during the surgical procedure.
3Reliability
If porous coating is attached using various joining methods, then attachment security is improved, but the complexity of manufacturing and implantation increases
Solution Approach 1:
The implant is segmented into distinct functional zones: a dense structural core for mechanical strength and a porous outer layer for bone integration. This segmentation allows each zone to be optimized independently while simplifying the overall manufacturing process through modular construction approaches.
Solution Approach 2:
The manufacturing process utilizes parameter changes such as temperature and pressure variations during sintering to control the density distribution. By adjusting sintering parameters, the implant can be manufactured with a dense core and porous surface in a single integrated process, reducing manufacturing complexity.
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 solution enhances bone integration and mechanical stability, promoting bone growth and reducing the risk of implant failure by facilitating natural bone ingrowth and providing structural support without the need for additional fixation methods.
Implementation Method 1
The framework may be coated with hydroxyapatite. Biologics such as demineralized bone matrix (DBM), bone morphogenetic proteins (BMP) and antibiotics may be provided as part of the porous insert.
Implementation Method 2
The porous insert may be adapted to facilitate tissue ingrowth
Implementation Method 3
Biologics such as demineralized bone matrix (DBM), bone morphogenetic proteins (BMP) and antibiotics may be provided as part of the porous insert.
Data Source
AI summary
A prosthesis includes an implant defining an attachment surface thereon. A porous insert is selectively coupled to the implant. The porous insert is adapted to be received at the attachment surface of the implant in a retained position. The porous insert is adapted to facilitate tissue ingrowth. In one embodiment the implant comprises a femoral component. The femoral component comprises an inner condylar portion having a first and second lateral sidewalls, an anterior wall and a posterior wall defining a box. The box defines the attachment surface. In other embodiments, the implant comprises a hip stem and an acetabular shell.