Acetabular Cup Extractor with Curved Blade and Clamping Mechanism
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Solution Overview
Problem
Current medical device implant extraction tools are difficult to use and often cause excess stress or unintended damage to the bone surrounding the acetabular cup implant during removal, posing a risk to bone conservation and safety due to the presence of major arteries.
Innovation Solution
An acetabular cup extractor with a fastener and cutting assembly, featuring a clamping mechanism with a biasing member and a curved blade, designed to securely attach to the implant and minimize bone stress, allowing for efficient removal with minimal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current extraction tools are used to remove the acetabular cup implant, then the implant can be extracted, but excess stress or unintended damage is caused to the surrounding bone
Solution Approach 1:
The extraction tool is divided into separate functional components: a fastener assembly with clamping portions for secure attachment to the implant, and a cutting assembly with a blade for cutting bone. This segmentation allows each component to perform its specific function efficiently - the fastener provides secure attachment without slipping, while the cutting blade removes bone in a controlled manner, reducing unintended damage to surrounding bone structures
Solution Approach 2:
The fastener assembly is attached to the implant before the cutting operation begins. The clamping portions engage the implant surface first, establishing a secure foundation. Only after the fastener is properly positioned and secured does the cutting assembly engage to remove bone. This preliminary attachment action ensures that the tool remains stable and controlled throughout the cutting process, preventing excess stress on surrounding bone
2Ease of operation
If current extraction tools are used, then the implant can be removed, but the tools are difficult to use and require excessive force
Solution Approach 1:
The clamping assembly incorporates a dynamic ratchet mechanism that allows the clamping portions to be easily adjusted and secured to the implant. The ratchet mechanism provides one-way engagement, allowing the operator to incrementally increase clamping force by simply pushing the clamping portions against the implant surface, without requiring complex tightening operations. This dynamic adjustment capability significantly improves ease of operation while maintaining secure attachment
Solution Approach 2:
The fastener assembly acts as an intermediary between the operator and the implant. Rather than directly applying force to the implant for removal, the fastener first attaches to the implant, then serves as a mounting platform for the cutting assembly. This intermediary structure distributes and controls the forces involved in extraction, making the overall process easier to operate while reducing direct stress on the implant-bone interface
3Productivity
If a cutting assembly is added to securely attach and remove the implant, then extraction efficiency is improved, but the device complexity increases
Solution Approach 1:
The fastener assembly and cutting assembly are merged into a single integrated extraction tool. The fastener assembly with its clamping portions and ratchet mechanism is combined with the cutting assembly featuring the blade and handle. This merging allows the tool to perform both attachment and cutting functions in one device, improving extraction efficiency by eliminating the need for separate tools or multiple attachment steps, while the integrated design prevents the complexity from becoming overwhelming
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 extractor provides improved efficiency and reduced bone stress during acetabular cup implant removal, protecting the surrounding bone and major arteries by applying a radially directed clamping force and using a curved blade to minimize bone loss.
Implementation Method 1
When moving to the extended position, the clamping assembly applies a clamping force for securing the fastener to the implant. The clamping force is a radially directed force.
Implementation Method 2
The biasing member is a wedge that slidingly engages a proximal end of the elongated shaft and at least one of the first and second clamping portions.
Implementation Method 3
The elongated shaft includes a threaded proximal end and the biasing member threadedly engages the threaded proximal end.
Data Source
AI summary
An acetabular cup extractor is provided that is designed for extracting medical device implants. The acetabular cup extractor includes a fastener for securing to an implant and a cutting assembly. The cutting assembly further includes a blade spaced and movably connected to the fastener and a handle operatively connected to the blade.