Patient-Specific Joint Implants Using Porous Titanium for Bone Integration
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Solution Overview
Problem
Existing synthetic implants for treating osteochondral defects face challenges such as biointegration issues, incongruence with the surrounding articular surface, damage to subchondral bone, and potential loosening due to imprecise fit, exacerbated by stress and impact forces in weight-bearing joints, and struggle with bonding to bone structures during healing.
Innovation Solution
A method involving 3D printing a titanium alloy substrate with porous layers and over-molding a polymer to mimic cartilage, using a surgical robot to resect the joint and place a patient-specific implant that fuses to bone, and adjusting the implant for congruence with the articular surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pre-defined synthetic implants are used to treat osteochondral defects, then the treatment can be standardized, but the implant may not achieve precise fit and congruence with the patient's unique joint anatomy
Solution Approach 1:
The patent changes the parameters of the implant from pre-defined standard sizes and shapes to custom-designed implants with specific geometric parameters tailored to each patient's joint anatomy. The system uses 3D imaging and computational algorithms to determine precise implant dimensions, curvature, and configuration that match the patient's unique articular surface, thereby achieving both standardization in manufacturing process and precision in fit.
Solution Approach 2:
The patent creates a digital copy or replica of the patient's unique joint anatomy through 3D imaging techniques. This virtual model is then used to design and manufacture a custom implant that precisely replicates the patient's joint geometry. The copying process allows for precise transfer of anatomical features from the patient's joint to the implant design, ensuring perfect fit and congruence.
2Reliability
If synthetic implants are used to replace damaged cartilage, then the joint can be treated, but the implant may cause damage to opposing cartilage and fail to biointegrate
Solution Approach 1:
The patent employs porous or porous-coated implant surfaces that promote bone ingrowth and biointegration. The porous structure allows bone cells to penetrate and attach to the implant, creating a strong biological bond. This porous material approach replaces the traditional smooth synthetic surface, enabling the implant to integrate with the patient's bone tissue rather than merely sitting on top of it, thereby eliminating cartilage damage and improving treatment reliability.
Solution Approach 2:
The patent uses composite materials that combine different material properties to create an implant that is both mechanically strong and biocompatible. The composite structure may include metal or polymer cores with porous coatings, or combinations of materials that provide both structural support and biological integration. This composite approach allows the implant to withstand joint loads while promoting bone healing and eliminating harmful effects on opposing cartilage.
3Ease of operation
If existing synthetic implants are used, then the treatment can be performed, but the implant may loosen due to imprecise fit under stress and impact forces
Solution Approach 1:
The patent performs preliminary 3D imaging and computational design before surgery to precisely determine the optimal implant size, shape, and position. This preoperative planning allows the surgeon to select or design an implant that will fit perfectly in the patient's joint, eliminating the need for intraoperative adjustments that could compromise stability. The preliminary action of custom design ensures that when the implant is installed, it achieves precise fit and will remain stable under stress and impact forces throughout the patient's life.
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 method achieves a congruent and smooth articular surface, restoring the joint's contours and ensuring a precise fit, reducing the risk of implant loosening and damage, while promoting bone integration.
Implementation Method 1
A porous or porous-coated surface is provided to promote bone integration
Implementation Method 2
A polymer material is over-molded onto the second porous layer and treated to exhibit properties that mimic cartilage
Data Source
AI summary
Methods, systems, and devices for treating osteochondral defects (OCDs) are disclosed. The disclosed methods and systems include collecting joint surface data using image-free methods, generating a three-dimensional (3D) healthy bone model based on the joint surface data and a database of healthy bone anatomies, defining the OCD boundary on the joint, generating a 3D implant model based on the 3D healthy bone model and the OCD boundary, manufacturing an implant based on the 3D implant model, generating an implantation plan, the resected cavity on the joint. The implant includes a 3D-printed titanium alloy substrate having a first and second porous layer separated by a nonporous layer. A polymer material is over-molded onto the second porous layer and treated to exhibit properties that mimic cartilage, while the first porous layer allows the implant to fuse to patient bone.