Acetabular Cup Impactor Static Handle Thread Lock
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Solution Overview
Problem
Conventional surgical tools for implanting acetabular cups in total hip replacement procedures face issues with secure fixation during impaction, leading to potential disconnection due to thread damage between the surgical implant and the tool holder.
Innovation Solution
A spindle-type surgical tool holder with a static and rigid design during impaction, featuring a spring-loaded mechanism to ensure a stable threaded connection between the surgical tool and the implantable cup, utilizing a rotating handle and insert handle with threads to securely attach the implant without damaging the threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spindle-type surgical tool holder with a rotating handle device is used to secure the implant, then the implant can be attached to the tool holder, but the threaded connection may be damaged during impaction causing disconnection
Solution Approach 1:
The handle is changed from a rotating mechanism to a static, non-rotating structure. The implant is secured through a straight threaded insertion that does not require rotation during impaction, eliminating the rotational stresses that caused thread damage while maintaining secure attachment.
Solution Approach 2:
The tool holder is divided into distinct functional sections: a strike plate for impact application, a static handle for grip, and a straight threaded insertion mechanism for securement. This segmentation allows each component to perform its specific function without interfering with others, preventing thread damage during impaction.
2Object-affected harmful factors
If a static and rigid tool holder design is used during impaction, then thread damage is minimized, but the ease of operation and secure attachment may be compromised
Solution Approach 1:
The implant is pre-secured to the static handle through threaded insertion before the impaction process begins. This preliminary securement ensures the implant remains firmly attached during subsequent impact operations, maintaining ease of operation while preventing thread damage through the rigid, non-rotating structure.
3Strength
If a rotating handle device is used to secure the implant, then the implant can be firmly attached, but disconnection may occur during impaction due to thread damage
Solution Approach 1:
The rotating handle is replaced with a static handle that provides firm fixation through straight threaded insertion. This eliminates the rotational movement that led to thread damage and subsequent disconnection, maintaining strong attachment while improving reliability during the impaction process.
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 solution provides a firm fixation of the surgical implant during impaction, minimizing thread damage and ensuring secure attachment, thus preventing disconnection and enhancing the stability of the implantation process.
Implementation Method 1
A spindle-type surgical tool holder with a static and rigid design during impaction, featuring a spring-loaded mechanism to ensure a stable threaded connection
Data Source
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AI summary
A surgical tool device for effecting implantation of an implant such as an acetabular cup during a hip replacement surgery is described. The surgical tool holder has a strike plate, a body, a proximal fixed handle, a distal rotate handle, an insert handle with threads, an impactor head, a shaft, the shaft pin, a shaft ring, and a spring. In use, when a surgical implant device is threaded onto the shaft, the surgeon merely rotates the assembly comprising the distal rotate handle and the insert handle with threads in one direction, which causes a distal threaded area of the shaft to rotate in a second, opposite direction to act as a lock-nut for the surgical implant. This movement simultaneously pulls the shaft toward the surgical tool holder proximal end. The pulling motion ensures the surgical implant device is positioned against the impactor head's contacting surface to provide a rigid assembly for good tactile feel during the implantation of the cup.