Porous Metal Soft Tissue Attachment Platform
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Solution Overview
Problem
Current methods for attaching soft tissue to bone or implants are often less successful when there is no bone present, and existing techniques for tendon and ligament repairs lack long-term stability and mechanical strength, particularly in the absence of bone.
Innovation Solution
A composite system featuring a porous metal structure for tissue ingrowth, a solid metal structure for stiffness and strength, and a bioactive matrix for cell stimulation, combined with a method using laser technology to create structures with gradient porosity for bone and soft tissue integration, allowing for initial load-bearing capability and long-term anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous structure is used for tissue in-growth, then tissue integration is improved, but mechanical strength decreases
Solution Approach 1:
The implant features a gradient porosity structure where different regions have different porosity levels. The first region has higher porosity (60-80%) to promote tissue in-growth, while the second region has lower porosity (20-40%) to provide mechanical strength. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The implant combines porous metallic material with different porosity characteristics to create a composite structure. The first region uses highly porous material for tissue integration, while the second region uses less porous material for structural support, effectively combining the benefits of both material states.
2Strength
If a solid metal structure is used for mechanical strength, then structural integrity is improved, but tissue in-growth capability decreases
Solution Approach 1:
The implant strategically places solid metal structure in the second region where mechanical strength is prioritized, while concentrating porous structure in the first region where tissue in-growth is needed. This spatial differentiation allows each region to excel at its primary function without compromising the other.
3Adaptability or versatility
If gradient porosity is implemented for differentiated tissue growth, then functional adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The implant is divided into two distinct regions with different porosity characteristics. This segmentation allows for simplified manufacturing of each region while achieving the overall gradient porosity effect, reducing manufacturing complexity compared to creating a continuous gradient.
Solution Approach 2:
The manufacturing process controls porosity parameters by varying processing conditions in different regions. By changing parameters such as laser power, scan speed, or powder feed rate during additive manufacturing, the system achieves different porosity levels in different regions without requiring complex post-processing.
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 system provides long-term anchoring and stability for soft tissue repairs by promoting tissue growth and integration, maintaining mechanical strength throughout the healing process, even in the absence of bone, and facilitating the transfer of loads during rehabilitation.
Implementation Method 1
a laser beam scans over the powder so as to sinter the metal powder at predetermined locations
Implementation Method 2
a laser beam scans over the powder so as to sinter the metal powder at predetermined locations
Data Source
AI summary
One embodiment of the implant comprises a porous metal bone ingrowth portion (14) having a first side connected to a high density or solid (fully dense) metal portion (16) which in turn has an opposite side connected to a porous metal soft tissue ingrowth portion (12) thus forming a sandwich structure with the high density or fully dense portion in the middle. The implant may be made of a resorbable material such as an alloy of magnesium. Alternately, the alloy can be selected from the group consisting of calcium, iron, yttrium and lithium. The porous metal soft tissue ingrowth portion (12) has porosity characteristics allowing cartilage to interdigitate with the pores and extend outwardly beyond the platform of the metal surface towards a joint capsule. The solid or fully dense intermediate layer 16 may have some porosity, however that porosity prevents either bone tissue or cartilage tissue from migrating therethrough.