Spring-Loaded Straight Cup Impactor for Secure Implant Fixation
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Solution Overview
Problem
Conventional spindle-type surgical tool holders risk disconnecting the surgical implant during impaction, potentially damaging the threads and compromising the secure fixation of the implant.
Innovation Solution
The improved spindle-type surgical tool holder incorporates a static design during impaction, utilizing a combination of non-moving and moving components to ensure a stable threaded connection, including a spring mechanism to securely attach the implant and prevent dislodging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spindle-type surgical tool holder with a rotating threaded section is used to secure the implant, then the implant can be attached to the tool holder, but the implant may disconnect or become dislodged during impaction, potentially damaging the threads
Solution Approach 1:
The patent transitions from a static rotating threaded section to a dynamic spring-loaded straight cup impactor design. The spring mechanism allows the impactor to move axially during impaction, maintaining constant pressure on the implant while absorbing impact forces, thereby preventing thread damage and dislodging
Solution Approach 2:
The spring mechanism is pre-loaded to provide cushioning before impaction begins. This beforehand cushioning absorbs the shock of impact forces during the impaction process, protecting the threaded connection from damage while maintaining secure attachment
2Reliability
If a rotating threaded section is used to secure the implant, then the implant can be fixed to the tool holder, but the complex mechanism may fail or disconnect during the impaction process
Solution Approach 1:
The patent removes the rotating threaded section entirely, extracting the complex mechanical locking mechanism. Instead, it uses a simplified spring-loaded straight cup impactor that secures the implant through axial spring pressure alone, eliminating the rotating components that could fail or disconnect
Solution Approach 2:
The impactor is divided into distinct functional segments: a straight cup impactor body, a separate spring mechanism, and an implant interface. This segmentation allows each component to perform its specific function independently, simplifying the overall mechanism while maintaining reliability
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
This design provides a firm fixation of the surgical implant during impaction, minimizing thread damage and ensuring the implant remains securely attached to the tool holder, enhancing the surgical procedure's reliability and precision.
Implementation Method 1
a spring mechanism to securely attach the implant and prevent dislodging
Data Source
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.