Acetabular Cup Removal Ring With Oscillating Circumferential Blade
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Solution Overview
Problem
Existing acetabular cup removal devices face challenges in removing malpositioned or complexly designed cups with minimal bone loss, particularly when direct access is limited or non-spherical designs are involved, leading to inefficiencies and increased tissue dissection.
Innovation Solution
An acetabular cup removal device comprising a mounting ring, rotor, arm, and oscillator assembly with a blade that allows for rotational and oscillating motion, enabling precise cutting around the cup's circumference without requiring direct perpendicular access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional osteotomes or powered saw blades are used for acetabular cup removal, then the cutting function is achieved, but direct perpendicular access is required which is impossible or requires significant tissue dissection when the cup is malpositioned or exposure is limited
Solution Approach 1:
The blade is mounted on an arm that can pivot about a second axis orthogonal to the first rotation axis, enabling the blade to approach the cup from multiple angular dimensions rather than requiring direct perpendicular access. This multi-axis movement allows the blade to navigate around malpositioned cups and reach difficult-to-access areas without requiring significant tissue dissection.
Solution Approach 2:
The device employs dynamic movement capabilities with the blade capable of rotating about a first axis and the arm pivoting about a second axis. This dynamic positioning system allows real-time adjustment of the blade's approach angle and position, enabling access to the cup from optimal angles while minimizing disruption to surrounding tissues.
2Adaptability or versatility
If current removal devices are used, then cutting capability is provided, but they cannot effectively handle non-spherical aspects of the acetabular cup's design
Solution Approach 1:
The oscillating blade mechanism provides dynamic cutting action that can adapt to non-spherical cup geometries. The oscillation allows the blade to engage with irregular surfaces and maintain effective cutting contact regardless of the cup's shape variations, ensuring reliable removal across diverse cup designs including those with spikes or non-standard geometries.
Solution Approach 2:
The device allows for parameter changes in blade motion through oscillation superimposed on rotation, enabling the blade to adapt its cutting pattern to match non-spherical cup surfaces. This variable motion pattern ensures consistent cutting performance whether the cup is spherical, flattened, or has protruding spikes.
3Loss of substance
If osteotomes with centering balls are used, then proper placement is easier and bone loss is diminished, but initial placement remains difficult when the osteotome must cover 90 degrees of arc or longer
Solution Approach 1:
The device replaces the manual osteotome placement mechanism with a powered rotational system mounted on a stable ring structure. The blade is driven by a motor to rotate and oscillate, eliminating the need for manual positioning and leverage that limited traditional osteotomes to shorter arc coverage. This mechanical substitution enables effective cutting across the full 360-degree circumference.
Solution Approach 2:
The ring-mounted blade assembly provides universal cutting capability that can remove cups of various sizes and positions. The system combines rotation and oscillation in a single integrated mechanism that can handle both the initial placement challenge and the complete circumferential cutting task, making it versatile for all cup removal scenarios.
4Productivity
If powered saw blades requiring direct perpendicular access are used, then cutting efficiency is improved, but application scope is limited when exposure is limited or cup is malpositioned
Solution Approach 1:
The blade operates in multiple dimensional spaces by rotating about a first axis and the arm pivoting about a second orthogonal axis. This multi-dimensional movement capability maintains high cutting efficiency through powered oscillation while simultaneously expanding application scope to include malpositioned cups and limited exposure scenarios that prevent direct perpendicular access.
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
Enables efficient removal of acetabular cups with minimal bone loss and reduced tissue dissection by allowing for flexible positioning and cutting around the cup's entire circumference.
Implementation Method 1
A rotating motion of a rotating portion of the oscillator assembly causes an oscillating motion of the blade within the second slit
Data Source
AI summary
An acetabular cup removal device and method. The removal device can include a mounting ring attachable to an acetabular cup, a rotor rotatably coupled to the mounting ring and rotatable about a first axis, an arm pivotably coupled to the rotor and pivotable about a second axis orthogonal to the first axis, an oscillator assembly slidably disposed in a first slit of the arm, and a blade slidably disposed in a second slit of the arm. A rotation of the oscillator assembly causes an oscillation of the blade within the second slit. The removal method includes coupling the device to an acetabular cup, positioning the arm and blade at an initial location, oscillating the blade so as to perform a cut, repositioning the arm at a subsequent adjacent location, repeating the repositioning and oscillating steps until a 360° circumference is cut around the acetabular cup, and removing the acetabular cup.