Modular Implant Assembly Tool with Compression Member
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Solution Overview
Problem
In femoral revision arthroplasty, existing assembly tools for modular implants require separate insertion and locking of proximal and distal components, which can be cumbersome and inefficient, lacking a method to securely lock the components in situ without disassembly.
Innovation Solution
An assembly tool comprising a proximal implant fastener, a distal implant fastener, and a compression member that holds the implants at a selected separation distance and securely locks the corresponding tapers by axial impaction and rotational mechanism, allowing for in situ locking without tool removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate assembly tools are used for insertion and locking of proximal and distal components, then each component can be inserted and locked independently, but the process becomes cumbersome and inefficient requiring multiple tool changes and disassembly steps
Solution Approach 1:
The patent combines the insertion and locking functions into a single integrated assembly tool. The tool includes a proximal implant fastener, distal implant fastener, and compression member that work together to both insert and lock the modular implant components in one continuous operation, eliminating the need for separate tools and multiple disassembly steps.
Solution Approach 2:
The assembly tool is designed with multi-functionality to perform both insertion and locking operations. The compression member can be rotated to transition between an insertion configuration (holding tapers at separation distance) and a locking configuration (reducing separation distance to lock tapers), allowing one tool to replace multiple specialized tools.
2Device complexity
If the assembly tool removes components before locking, then locking can be performed with simpler tools, but the process becomes more complex requiring multiple steps of disassembly and reassembly
Solution Approach 1:
The patent merges the insertion and locking functions into a single integrated assembly tool. The tool includes a proximal implant fastener, distal implant fastener, and compression member that work together to both insert and lock the modular implant components in one continuous operation, eliminating the need for separate tools and multiple disassembly steps.
3Manufacturing precision
If the tapers are held at separation distance during impaction, then precise placement can be achieved, but the locking mechanism must be additional complex to secure the tapers after impaction
Solution Approach 1:
The compression member is designed with dynamic functionality that allows it to transition between two states: during insertion, it holds the tapers at a selected separation distance to enable precise placement; during locking, rotation of the compression member reduces the separation distance to lock the tapers together. This dynamic transformation is achieved through the threaded interaction between the compression member and the distal implant fastener.
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
Facilitates efficient and secure assembly and locking of modular implants during implantation, enabling precise placement and stable fixation of proximal and distal components without disassembly, enhancing the implantation process in femoral revision arthroplasty.
Implementation Method 1
Axial compaction can be exerted through the compression member of the assembly tool
Implementation Method 2
The knob is rotatable to reduce the separation distance and lock corresponding tapers of the proximal and distal implants after impaction
Data Source
AI summary
A method of implanting a modular implant having a proximal implant and a distal implant into an anatomic site includes sequentially assembling a plurality of components of an assembly tool on to the proximal and distal implants and holding corresponding tapers of the proximal and distal implants separated by a selected separation distance by the assembly tool. The method also includes impacting the proximal and distal implants to an anatomic depth without changing the separation distance by impacting the assembly tool, and actuating the assembly tool to lock the corresponding tapers of the proximal and distal implants without removing the assembly tool.