Modular Elbow Prosthesis with Retention Trap for Anatomical Adaptability
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Solution Overview
Problem
Current elbow arthroplasty technologies face challenges in providing a versatile and stable prosthetic solution that can be easily assembled and configured to restore range of motion in the elbow joint, while accommodating anatomical differences and ensuring secure fixation in various patient populations.
Innovation Solution
The elbow arthroplasty apparatus comprises a humeral component, an ulnar component, articulation liners, and a retention trap, forming a ball-and-socket configuration that allows for adjustable assembly and secure fixation, utilizing bio-compatible materials like titanium alloys for stability and compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional fixed elbow prosthesis design is used, then the implant structure is simple, but it cannot accommodate anatomical variations and provides limited adjustability
Solution Approach 1:
The elbow prosthesis is divided into separate modular components including a humeral component, an ulnar component, and interchangeable articulation liners. This segmentation allows each component to be independently selected and configured based on patient-specific anatomical requirements, providing adaptability without requiring complete redesign of the entire prosthesis system.
Solution Approach 2:
The humeral component and ulnar component are designed with universal interfaces that can accommodate multiple types of articulation liners (spherical, elliptical, hinge). This multi-functionality enables the same basic components to serve different patient populations with varying anatomical needs, increasing versatility while maintaining a relatively simple base structure.
2Adaptability or versatility
If a modular elbow prosthesis with multiple components is used, then adaptability to anatomical variations is improved, but assembly complexity and risk of intraoperative errors increase
Solution Approach 1:
A retention trap mechanism serves as an intermediary component that mediates the assembly between the humeral component, ulnar component, and articulation liners. This retention trap provides a controlled interface that guides proper alignment and secures the modular components together, simplifying the assembly process while maintaining configurability.
Solution Approach 2:
The articulation liners are pre-configured with specific geometric profiles (spherical, elliptical, hinge) that determine the range of motion and articulation characteristics. By preparing these components with predetermined functions before implantation, the surgical assembly process is simplified as the components are designed to fit together in a predetermined sequence and configuration.
3Reliability
If a retention mechanism with multiple locking components is used, then fixation stability is improved, but the device complexity and difficulty of assembly increase
Solution Approach 1:
The retention trap combines multiple retention functions into a single integrated component. Rather than using separate locking mechanisms for each interface, the retention trap merges the functions of securing the articulation liner to the humeral component and securing the ulnar component to the humeral component into one unified structure, reducing overall complexity while maintaining fixation stability.
Solution Approach 2:
The retention trap is designed with a nested structure where the articulation liner is retained within the humeral component, and the ulnar component is retained within the assembly. This nesting arrangement provides multiple levels of fixation stability while using a compact, relatively simple retention mechanism rather than multiple distributed locking components.
Data Source
AI summary
The present disclosure generally relates to an elbow arthoplasty prosthesis that includes an ulnar component, a humeral component, one or more articulation liners, and a retention trap. The ulnar component includes a spherical bearing head that can be inserted into the humeral component in a number of orientations. The articulation liners and the retention trap are operatively engaged to the humeral component to retain the ulnar component within a humeral socket. The present disclosure also relates to methods of assembling and implanting the prosthetic device.