Modular Implant Guard Protecting Connection Points
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Solution Overview
Problem
Modular implant connections in joint replacement surgeries are vulnerable to inadvertent scratching or damage during the trial fitting process, as exposed regions and connection points are not adequately protected, which can compromise the fit and stability of the implant.
Innovation Solution
A guard with an outer and inner sidewall, defining a cavity, is used to protect the connection points between modular implant components, made from biocompatible materials like polyethylene or PEEK, which provides a tight fit and includes grasping features for easy removal, allowing for secure test fitting without locking and protecting the implant from debris during reaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the modular implant components are left exposed during trial fitting, then the surgeon can easily test fit various components to accommodate patient anatomy, but the connection points between components are vulnerable to inadvertent scratching or damage
Solution Approach 1:
A protective guard is introduced as an intermediary component that covers the connection points between modular implant components during trial fitting and reaming procedures. The guard allows the surgeon to easily test fit various components while simultaneously protecting the vulnerable connection points from scratching or damage, thus resolving the contradiction between ease of operation and reliability.
2Reliability
If the guard provides a tight fit to protect the implant connection, then the connection points are well protected, but the guard may lock during test fitting making removal difficult
Solution Approach 1:
The guard is designed with different surface characteristics at different locations: the outer surface has a roughened texture that provides friction engagement with the femur for stable protection during surgery, while the inner surface at the distal end has a smooth polished finish that prevents locking with the trial or final implant components. This local differentiation of surface quality allows the guard to provide tight protective fit while enabling easy removal when needed.
3Reliability
If the guard is made from biocompatible materials like polyethylene or PEEK, then the guard is safe for use during surgery, but the guard must be removed before final implant assembly
Solution Approach 1:
The protective guard is designed as a disposable, single-use component made from biocompatible materials that can be safely left in the body if needed, but is intended to be removed before final implant assembly. The guard serves its protective function during critical procedures (trial fitting and reaming) and can be discarded rather than sterilized and reused, eliminating the need for complex reprocessing while maintaining biocompatibility and safety.
Data Source
AI summary
Apparatus and methods of protecting modular implant connection portions are provided. A guard includes an outer sidewall and an inner sidewall defining a cavity that covers a modular implant connection portion. The modular implant connection covered with the guard can facilitate test-fitting of other modular implant components and allows reaming of the tissue around the guard.