Surgical Cutting Tool Guide Apparatus with Sheath Alignment
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Solution Overview
Problem
Current surgical cutting tools lack effective alignment mechanisms for precise resection of bones during prosthetic joint attachment, leading to inefficiencies and potential misalignment.
Innovation Solution
A guide apparatus featuring alignment pins and parallel plates with a sheath that engages a surgical cutting tool, allowing for precise alignment and controlled motion along a guide plane, utilizing a cylindrical and bulbous portion for constrained translation and rotation, and a profile cutting guide to limit cutting depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surgical cutting tools are used without alignment mechanisms, then the surgical procedure can be performed, but the alignment precision and resection accuracy deteriorate
Solution Approach 1:
The guide apparatus is divided into distinct functional segments: alignment pins for positioning, parallel plates for defining the cutting plane, a sheath for guiding the cutting tool, and a profile cutting guide for depth control. Each segment performs a specific alignment or guidance function, collectively achieving precise bone resection alignment without requiring a single complex device.
2Manufacturing precision
If a guide apparatus with multiple constraints is used, then the cutting accuracy is improved, but the ease of operation deteriorates due to complex alignment procedures
Solution Approach 1:
The alignment pins are pre-positioned on the bone surface before the cutting procedure, establishing the desired resection plane in advance. The parallel plates and sheath are designed with predetermined geometries that automatically align with these pins, eliminating the need for complex real-time adjustments during the cutting operation and simplifying the surgical workflow.
3Ease of operation
If the sheath is designed with both cylindrical and bulbous portions, then the rotational and translational control is improved, but the device complexity increases
Solution Approach 1:
The sheath employs different geometric forms in different regions to achieve specific control functions: the cylindrical portion provides smooth rotational guidance and fits within the parallel plates, while the bulbous portion engages with the profile cutting guide to control translational movement and cutting depth. This localized functional differentiation achieves precise multi-axis control without requiring a uniformly complex structure throughout the entire sheath.
Data Source
AI summary
A guide apparatus for a surgical cutting tool includes a plurality of plates arranged in parallel with a guide plane. The plates form opposing bearing surfaces spaced apart over a clearance distance that defines an opening. A sheath includes a cylindrical portion that extends along a longitudinal axis and forms an interior passage extending through cylindrical portion along the longitudinal axis. The cylindrical portion of the sheath slidably engages the opening through the clearance distance, and the interior passage of the sheath receives a rotary cutting head of the surgical cutting tool in an operating configuration.