Blade Reamer Wavy Profile Reduces Chatter
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Solution Overview
Problem
Blunt reamers used in surgical procedures often experience chatter and vibration during bone cutting, leading to uneven surface finishes in sockets, particularly in hip and knee replacement surgeries.
Innovation Solution
A blade-type reamer assembly with a cutting rib and centralizer design that reduces chatter and vibration by using a wavy profile cutting rib and a centralizer with radial slots to form tunnels for debris passage, along with a cap to limit access and reduce friction, and a reamer handle for torque delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a blade-type reamer is used for cutting bone, then cutting efficiency is improved, but chatter and vibration occur causing uneven surface finish
Solution Approach 1:
The patent applies controlled mechanical vibration through the wavy profile design of the cutting rib. The wavy profile creates periodic variations in cutting depth that generate beneficial vibrations during reaming, which prevent chatter and vibration while maintaining cutting efficiency. This transforms harmful vibrations into controlled mechanical vibrations that improve surface finish quality.
Solution Approach 2:
The patent changes the geometric parameters of the cutting rib by introducing a wavy profile instead of a straight edge. This parameter change modifies the cutting characteristics, allowing the reamer to maintain high cutting efficiency while eliminating the chatter and vibration that cause poor surface finish. The wavy profile parameters are specifically designed to control the cutting process.
2Ease of operation
If a centralizer with radial slots is used to reduce friction, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent segments the centralizer structure by introducing radial slots that divide the centralizer into distinct sections. These slots create gaps between the cutting rib and centralizer, forming tunnels that reduce friction during operation. The segmentation allows bone chips to pass through while maintaining structural integrity, improving ease of operation without excessive complexity.
Solution Approach 2:
The centralizer is designed with a porous-like structure through the radial slots and tunnels. This allows bone chips and debris to pass through the centralizer structure during reaming, reducing friction and improving ease of operation. The porous design maintains sufficient structural strength while enabling debris ejection pathways.
Data Source
AI summary
A device is provided, including a cutting rib, the cutting rib including an arcuate portion having an outer sharp edge and a centralizer configured to receive the cutting rib through a radial slot, the radial slot forming a gap with the cutting rib. The arcuate portion of the cutting rib is formed into a profile that follows a surface of the centralizer, the outer sharp edge of the arcuate portion of the cutting rib has a wavy profile that forms a tunnel in the gap between the centralizer and the cutting rib, and the outer sharp edge of the arcuate portion of the cutting rib protrudes outwardly from the surface of the centralizer. A method for using the device to cut bone in a surgical configuration is also provided.