Femoral Prosthesis Extractor With Offset Hook Force Transfer
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Solution Overview
Problem
Current methods for removing failed orthopedic implants are invasive, require excessive surgical dissection, and lack the ability to effectively transmit sufficient force to break the bond between the implant and bone, leading to prolonged recovery times and increased risk of complications.
Innovation Solution
A prosthetic implant extraction device with an elongated member and offset hook mechanism that allows for secure attachment to the implant, enabling efficient transfer of kinetic energy to disrupt the implant/bone interface, facilitating less invasive removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If current extraction methods are used to remove failed implants, then the implant can be removed, but the procedure requires excessive surgical dissection and causes significant tissue and bone damage
Solution Approach 1:
The extraction device is divided into multiple segments including a first segment with a first striking surface, a second segment with a second striking surface, and a third segment with a hook mechanism. This segmentation allows force to be applied at multiple points along the implant, enabling effective extraction through the distal femur with minimal soft tissue disruption.
Solution Approach 2:
The device applies extraction force through a different anatomical dimension by striking the device through the distal femur rather than requiring extensive anterior or lateral surgical exposure. This dimensional approach allows force transmission along the longitudinal axis of the femur, reducing the need for excessive surgical dissection.
2Force
If current extraction tools are used, then implant removal is attempted, but sufficient force cannot be transmitted to break the bond between implant and bone
Solution Approach 1:
The extraction device serves as an intermediary mechanism that transmits force from the surgeon's hammer strikes through the distal femur to the implant-bone interface. The device includes a hook mechanism that engages the implant and striking surfaces that receive impact forces, effectively mediating the force transmission to break the implant-bone bond.
Solution Approach 2:
The device incorporates curved or angled striking surfaces that optimize force vector alignment with the implant axis. The first and second striking surfaces are positioned to receive impacts that translate efficiently into longitudinal extraction force, improving the reliability of force transmission to break the bond between implant and bone.
3Productivity
If osteotomy is performed to remove failed implant, then implant can be removed, but operative time is significantly prolonged and recovery period is extended
Solution Approach 1:
The device enables direct extraction of the failed implant through the distal femur by transmitting force along the implant's longitudinal axis. This extraction approach eliminates the need for osteotomy procedures, significantly reducing operative time and preserving bone stock while shortening the recovery period.
4Object-affected harmful factors
If well-fixed implants are removed using current techniques, then implant is extracted, but muscle, tissue, and bone damage occurs and surgical complications risk increases
Solution Approach 1:
The device allows preliminary engagement of the hook mechanism with the implant before force application. The hook can be inserted and secured to the implant through a small distal incision, establishing a secure attachment before hammer strikes are applied. This preliminary action minimizes tissue damage and reduces the risk of surgical complications during extraction of well-fixed implants.
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 device enables efficient, less invasive extraction of orthopedic implants with minimal tissue and bone damage, reducing operative time and recovery period.
Implementation Method 1
enabling efficient transfer of kinetic energy to disrupt the implant/bone interface
Data Source
AI summary
The present device described herein is intended to effect the removal of an orthopedic prosthetic implant from the intramedullary cavity of the bone. The extraction device utilizes a clamping mechanism which can be tightly secured to the implant, particularly the neck of a femoral prosthetic component. The clamping mechanism is attached to an elongated member that contains two striking surfaces. A force applied to the striking surface(s) is transmitted to the prosthesis so as to extract the implant from the intramedullary cavity of a bone.