Humeral and Glenoid Implants With Inverse Bone Contours
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Solution Overview
Problem
Existing articular cartilage implants do not effectively replace hyaline cartilage, leading to durability issues and potential further injury, and require designs that minimize damage to surrounding areas while ensuring ease of installation.
Innovation Solution
A system involving multiple reamers and an anchor-tray-liner configuration is used to create a customized implant site on bones like the humerus and glenoid, ensuring a secure fit and minimizing movement, using guides and pins to establish a working axis and form a contour that matches the implant's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing articular cartilage implants are used to repair damaged cartilage, then the implant can replace hyaline cartilage, but the implant durability is insufficient and may cause further injury
Solution Approach 1:
The implant system is divided into multiple components: an implant body, a baseplate, and an anchor. The baseplate is separately secured to the bone surface using the anchor, allowing the implant body to be positioned and secured independently. This segmentation enables more precise positioning and secure attachment, improving implant durability and reducing the risk of further injury.
Solution Approach 2:
The baseplate is secured to the bone surface in advance using the anchor before the implant body is positioned. This preliminary action establishes a stable foundation that prevents movement and ensures proper alignment during subsequent implant installation, thereby improving reliability and preventing further injury.
2Stability of the object's composition
If a customized implant site is created using multiple reamers and an anchor-tray-liner configuration, then the implant fit is secure and movement is minimized, but the installation process becomes more complex
Solution Approach 1:
The implant system is divided into modular components (implant body, baseplate, anchor) that can be installed sequentially. Each component has a specific function and can be secured independently, which simplifies the overall installation process while maintaining high stability. The baseplate is first secured, then the implant body is positioned, allowing for easier alignment and fixation.
Solution Approach 2:
The baseplate acts as an intermediary component between the anchor and the implant body. It provides a stable foundation and alignment reference, facilitating the subsequent positioning and securing of the implant body. This intermediary element simplifies the installation process by breaking down the complex task into manageable steps while ensuring high fit stability.
3Duration of action of stationary object
If the implant site contour is customized to match the implant shape, then the functional life of the implant is enhanced, but the manufacturing and installation precision requirements increase
Solution Approach 1:
The baseplate is designed with a specific local quality feature: a recess that receives the implant body and a contoured surface that matches the bone anatomy. This localized customization at the baseplate level enables precise contour matching without requiring the entire implant system to be manufactured with high precision. The anchor and implant body can be manufactured with standard tolerances while the baseplate provides the customized fit.
Solution Approach 2:
The customization of the implant site contour is achieved through the baseplate component rather than the entire implant system. By segmenting the design, the high precision contour matching is concentrated in the baseplate, which can be manufactured with appropriate precision, while the anchor and implant body can be produced with standard manufacturing tolerances. This reduces overall manufacturing precision requirements.
Data Source
AI summary
One embodiment of the present disclosure provides a humeral implant. The humeral implant includes a tray including a body defining a bone facing recess and a liner recess, said bone facing recess including a ring surface and a convex surface, wherein the ring surface has a profile substantially corresponding to a profile of an outer ring of bone in an excision site of a patient; and wherein said convex surface has a profile substantially corresponding to a profile of a concave socket formed in the excision site. The humeral implant also includes a liner including a body defining a load bearing surface and a tray interface surface, said tray interface surface being configured to be at least partially received in said liner recess of said tray such that said implant is coupled to said tray.