Acetabular Cup Removal Device Ratchet Blade Rotation
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Solution Overview
Problem
Current devices for removing acetabular cups during surgery face challenges in minimally invasive techniques, including difficulty in maneuvering within restricted spaces, risk of contact with soft tissues, and incomplete revolution of the removal tool, leading to longer surgical times and increased tissue trauma.
Innovation Solution
A device with a central body and two handles, featuring a ratchet mechanism with toothed elements and a helical spring, allowing for controlled rotation of the blade without full insertion of the central body into the wound, minimizing contact with soft tissues and enabling complete revolution of the blade for efficient cup removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central body is fully inserted into the wound for cup removal, then the blade can effectively remove the acetabular cup, but contact with soft tissues increases causing tissue trauma
Solution Approach 1:
The device changes the spatial dimension of operation by allowing the blade to rotate around the acetabular cup while the central body remains positioned outside the wound. The blade extends through the soft tissues to engage the cup, then revolves around it in a circular path, enabling effective removal without deep insertion of the central body that would cause tissue trauma.
2Productivity
If the device allows complete revolution of the blade for efficient cup removal, then surgical time is reduced, but the device complexity increases
Solution Approach 1:
The device incorporates a dynamic ratchet mechanism that allows the blade to rotate freely in one direction (clockwise) while preventing rotation in the opposite direction. This dynamic constraint system enables complete revolution of the blade around the acetabular cup for efficient removal, while the simple ratchet structure maintains overall device simplicity without requiring complex control systems.
3Ease of operation
If a ratchet mechanism is added to control blade rotation, then maneuvering control is improved, but the device complexity increases
Solution Approach 1:
The ratchet mechanism is designed as a passive, self-regulating system that automatically controls blade rotation based on the direction of applied force. When the surgeon applies rotational force in the clockwise direction, the ratchet allows free rotation; when force is applied counterclockwise, the ratchet automatically engages to prevent reverse rotation. This self-service mechanism provides excellent maneuvering control without requiring active control systems or increasing overall device complexity.
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 quicker and safer acetabular cup removal in minimally invasive surgeries by reducing contact with soft tissues and allowing full rotation of the blade, thereby reducing surgical time and tissue trauma while maintaining ease of use and cost-effectiveness.
Implementation Method 1
a first toothed element, and a second toothed element coupled so that the second toothed element is configured to rotate by the first toothed element when the first toothed element rotates in a previously defined direction
Data Source
AI summary
A device is for removing an acetabular cup. The device may include a central body having a first end integrally connected to the central body, bearing a handle, and a transverse handle, and a second end integrally connected to the central body. The device may include a first toothed element, and a second toothed element coupled so that the second toothed element is configured to rotate by the first toothed element when the first toothed element rotates in a previously defined direction.