Acetabular Cup Cutter Tilting Mechanism for Bone-Sparing Removal
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Solution Overview
Problem
Conventional acetabular cup removal devices face issues with cutters getting caught on the outer surface of elliptical acetabular cups during removal, leading to improper operation or cutter breakage, and result in excessive bone loss when using larger radius cutters.
Innovation Solution
An acetabular cup removal device with a cutter section that tilts along the acetabulum, featuring a cutter tilting unit, a cutter mounting unit, and a leaf spring mechanism that allows the cutter to smoothly traverse the acetabular cup surface by sliding and tilting, minimizing bone loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutter with larger radius is used to remove elliptical acetabular cups, then the cutter can properly traverse the cup surface without getting caught, but this results in greater bone loss for the patient
Solution Approach 1:
The cutter is designed with dynamic tilting capability, allowing it to adjust its orientation relative to the acetabular cup surface during removal. The cutter mounting unit includes a tilting mechanism that enables the cutter to adapt to the elliptical geometry of the cup, maintaining proper contact without requiring excessive cutter radius, thus minimizing bone loss while ensuring reliable removal operation
2Device complexity
If a conventional fixed cutter is used on elliptical acetabular cups, then the device structure remains simple, but the cutter gets caught on the outer surface and may break during operation
Solution Approach 1:
The cutter mounting unit incorporates a tilting mechanism that allows the cutter to dynamically adjust its angle relative to the acetabular cup surface. This dynamic adjustment capability enables the cutter to properly traverse the elliptical cup geometry without getting caught, preventing operation failure or cutter breakage while maintaining reasonable device complexity through integrated mechanical tilting components
3Ease of operation
If the cutter tilts toward the major axis of an elliptical acetabular cup during removal, then the cutter can access the apex region, but the cutter becomes caught on the outer surface and operation fails
Solution Approach 1:
The cutter mounting unit includes a controlled tilting mechanism that enables the cutter to tilt toward the major axis to access the apex region of elliptical cups. Simultaneously, the mechanism provides controlled movement capability that allows the cutter to be repositioned or adjusted during the tilting process, preventing the cutter from becoming caught on the outer surface and ensuring continuous operation through adaptive cutter positioning
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 smooth removal of elliptical acetabular cups from the pelvis without bone loss, ensuring efficient detachment and reducing the risk of cutter breakage.
Implementation Method 1
a leaf spring fixed at both ends to the connecting bar, with a central portion located between the two ends... capable of sliding toward or away from the imaginary tilting axis
Data Source
AI summary
The acetabular cup removal device for artificial hip joints according to an embodiment of the present invention comprises a main shaft and a cutter section that cuts the acetabular region while being rotated by the main shaft. The cutter section includes a cutter tilting unit capable of tilting along the acetabular region around an imaginary tilting axis, a cutter mounting unit coupled to the cutter tilting unit in a manner that allows relative sliding toward or away from the imaginary tilting axis, and a cutter detachably mounted on the cutter mounting unit. The cutter tilting unit comprises a first through-hole penetrating along the imaginary tilting axis, a connecting bar fixed at both ends to the cutter mounting unit, and a leaf spring fixed at both ends to the connecting bar with a central portion between the two ends.