Acetabular Cup Excise Device Multi-Axis Handle Positioning
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Solution Overview
Problem
The existing acetabular cup removal devices are inefficient due to the need for multiple cuts and awkward positioning, which increases surgical time and patient discomfort, as the handle shaft length limits effective leverage and often strikes the patient's body or obstructions, and the inability to easily reposition the osteotome blade for optimal cutting angles.
Innovation Solution
An acetabular excise device with a handle shaft and positioning assembly that allows the handle lever to rotate and slide along multiple axes, enabling improved leverage and clearance, allowing the osteotome blade to be repositioned for efficient cutting without snagging or blocking, and includes a rotating locking element and sliding-locking mechanism for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional osteotome with fixed handle shaft is used, then the structure is simple, but the handle shaft strikes the patient's body or obstructions preventing effective leverage
Solution Approach 1:
The handle shaft is made dynamically repositionable through a positioning assembly with multiple radial axes. The handle can be rotated and repositioned along different radial axes perpendicular to the longitudinal axis, allowing the surgeon to adapt the handle position to avoid obstructions and apply effective leverage during the cutting process.
Solution Approach 2:
The handle positioning system is segmented into modular components including a positioning assembly with multiple radial axes. This segmentation allows independent adjustment of the handle position without affecting the entire device structure, enabling flexible repositioning while maintaining overall device integrity.
2Productivity
If multiple driven cuts are made by pivoting the blade, then the acetabular cup can be removed, but the process slows removal and increases patient discomfort
Solution Approach 1:
The positioning assembly enables continuous repositioning of the handle and blade during the cutting process without requiring removal of the device. This allows multiple cuts to be made in a continuous sequence, maintaining the blade's engagement with the bone and eliminating time losses associated with removing and reinserting the blade between cuts.
Solution Approach 2:
The blade is pre-positioned adjacent to the acetabular cup edge before the cutting process begins. The positioning assembly allows the blade to be systematically moved through predetermined cutting paths, enabling efficient sequential cuts without repeated positioning adjustments.
3Ease of operation
If the surgeon repositions the head to strike the osteotome blade, then cuts can be made, but the surgeon must awkwardly reach or move about the patient's body
Solution Approach 1:
The positioning assembly adds radial dimensionality to the handle shaft, allowing repositioning along multiple radial axes perpendicular to the longitudinal axis. This transforms a single-axis linear positioning problem into a multi-dimensional positioning system, enabling the surgeon to access cutting positions from various angles without awkward body positioning.
4Force
If a long handle shaft is used to apply leverage, then cutting force is improved, but the handle shaft strikes the patient's body or obstructions
Solution Approach 1:
The handle shaft's length and position are made dynamically adjustable through the positioning assembly. The handle can be repositioned along multiple radial axes to optimize both the leverage arm length for applying cutting force and the clearance from obstructions, allowing the surgeon to adapt the handle position to the specific anatomical constraints of each patient.
Data Source
AI summary
An acetabular cup excise device includes a cup excising portion, an elongated handle shaft extending along a longitudinal axis from the cup excising portion, and a positioning assembly operably coupled to the handle shaft. The positioning assembly is configured to allow rotation of a handle lever, about the longitudinal axis, to position the handle lever along at least a first radial axis perpendicular to the longitudinal axis and a second radial axis perpendicular to the longitudinal axis.