Adjustable Arthroplasty Devices with Self-Locating Bone Anchoring
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Solution Overview
Problem
Current knee arthroplasty procedures are time-consuming and costly due to the need for complicated and expensive trial instruments and procedures, which hinder efficient and cost-effective implantation of knee implants.
Innovation Solution
The development of adjustable arthroplasty devices and methods that utilize movable and lockable attachment features, such as rotary plates and translation couplers, to securely couple bone anchoring components to arthroplasty prostheses, allowing for precise positioning and self-location without the need for extensive trial procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional trial instruments and procedures are used for knee arthroplasty, then precise positioning of implants can be achieved, but the surgical procedure becomes time-consuming and costly
Solution Approach 1:
The bone anchoring component is designed to self-locate relative to the arthroplasty prosthesis through its engagement with the bone. The component automatically positions itself correctly when secured to the bone, eliminating the need for external trial instruments to determine proper positioning. This self-positioning capability resolves the contradiction by achieving precise implant positioning without requiring time-consuming trial procedures.
Solution Approach 2:
The bone anchoring component performs the positioning function in advance during the bone engagement phase, before the final implant assembly is completed. By pre-establishing the correct spatial relationship between the bone and the prosthesis through the anchoring component's self-location features, the system eliminates the need for subsequent trial procedures, thereby reducing surgical time while maintaining positioning precision.
2Manufacturing precision
If traditional trial instruments are used for knee arthroplasty, then accurate implant orientation can be achieved, but the cost and complexity of the procedure increase
Solution Approach 1:
The patent extracts the positioning and orientation function from the complex external trial instrument system and integrates it directly into the bone anchoring component itself. The anchoring component incorporates self-location features that provide accurate orientation guidance inherently, eliminating the need for separate, complicated trial instruments. This extraction resolves the contradiction by maintaining orientation accuracy while dramatically reducing device complexity.
Solution Approach 2:
The bone anchoring component is designed to perform multiple functions: it provides mechanical support, secures the prosthesis to the bone, and simultaneously determines the correct orientation and positioning of the implant. This multi-functionality eliminates the need for specialized trial instruments, resolving the contradiction by achieving accurate orientation through a simplified, universal component rather than complex specialized tools.
3Manufacturing precision
If adjustable attachment features are used to couple bone anchoring component to prosthesis, then precise positioning is enabled, but the device structure becomes more complex
Solution Approach 1:
The patent merges the attachment function with the positioning function into a single integrated mechanism. The bone anchoring component's attachment features to the prosthesis are designed to simultaneously achieve both secure coupling and precise self-location. By combining these functions rather than using separate adjustment mechanisms, the system achieves precise positioning while minimizing the added structural complexity.
Solution Approach 2:
The attachment features are designed to automatically establish the correct position and orientation when the bone anchoring component is secured to the bone. The system self-adjusts and self-locates through the interaction between the anchoring component and the prosthesis, eliminating the need for complex manual adjustment mechanisms. This self-service approach resolves the contradiction by achieving precise positioning through automatic self-location rather than complex adjustable mechanisms.
Data Source
AI summary
A method for replacing a natural articular surface on a bone may include movably mating a first adjustable attachment feature of an arthroplasty prosthesis with a second adjustable attachment feature of a bone anchoring component to movably couple the bone anchoring component to a bone-facing side of the arthroplasty prosthesis, securing a bone engagement surface of the bone anchoring component to a resected surface of the bone, and replacing the natural articular surface on the bone with an articular surface on a joint-facing side of the of the arthroplasty prosthesis.