Femoral Prosthesis Extractor Hook for Minimally Invasive Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for removing failed orthopedic implants are invasive, require excessive surgical dissection, and lack effective tools to transmit sufficient force for implant extraction, 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, designed to engage the implant's trunnion, allowing for efficient force transmission and minimally invasive removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional implant removal tools are used, then the implant can be removed, but the surgical dissection and incisions must be enlarged and operative time is prolonged
Solution Approach 1:
The extraction device serves as an intermediary tool that transmits force from the surgeon to the implant. The device includes a handle, shaft, and engagement mechanism (such as a hook or clamp) that attaches to the implant's trunnion or shoulder, allowing controlled force transmission without requiring direct manual manipulation or excessive surgical exposure
Solution Approach 2:
The extraction device is divided into functional segments: a handle portion for surgical manipulation, a shaft for force transmission, and an engagement mechanism at the distal end. This segmentation allows each component to be optimized for its specific function while maintaining overall device effectiveness in a minimally invasive manner
2Force
If current extraction tools are used, then the implant can be removed, but sufficient force cannot be transmitted to break the bond between implant and bone
Solution Approach 1:
The engagement mechanism incorporates curved or spherical contact surfaces that conform to the implant's trunnion or shoulder geometry. This curvature distributes force across a larger contact area, improving force transmission efficiency and reducing the risk of tool failure during extraction
Solution Approach 2:
The engagement mechanism is designed with asymmetric geometry that matches the specific contours of the implant's trunnion or shoulder. This asymmetric design ensures optimal force transmission paths and prevents slippage during the extraction process, thereby improving reliability
3Ease of operation
If retrograde disimpaction is used, then the implant can be removed, but excessive bone removal is required and the procedure is ineffective due to loss of force through inferior vector
Solution Approach 1:
Instead of approaching the implant from the distal end (retrograde) through the joint space, the device engages the implant from the proximal end through the greater trochanter or intertrochanteric region. This inverted approach allows force to be applied directly along the implant's longitudinal axis, eliminating the need for excessive bone removal and improving force transmission efficiency
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 less invasive and efficient extraction of orthopedic implants with reduced tissue and bone damage, optimizing revision joint replacement procedures.
Implementation Method 1
a first striking surface positioned on the first segment extending away from the elongated member
Implementation Method 2
The device is configured to receive an impact and transmit the impact to the implant
Implementation Method 3
a hook or clamp mechanism positioned at the second end of the third segment, wherein the hook includes a channel substantially perpendicular to a long axis of the third segment that is configured to engage a surgical implant
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.