Mastoid Bone Drill Bit Geometry for Cooler, Rounder Holes
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Solution Overview
Problem
Current drill bits used for drilling into the mastoid bone generate excessive heat, lead to inefficient drilling times, and result in poor hole roundness and bone integration issues during the implantation of bone conduction devices.
Innovation Solution
A drill bit with longitudinally extending straight flute blades, designed to minimize heat generation and improve bone shaving transport, featuring a compound conical cutting head with a curved distal end and straight proximal side, which reduces drill wander and enhances hole roundness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional drill bits are used for drilling into mastoid bone, then drilling can be performed, but excessive heat is generated and heat transfer to bone increases
Solution Approach 1:
The drill bit is segmented into multiple straight flute blades (typically 3-4 blades) rather than a solid cutting surface. This segmentation creates channels between the blades that facilitate cooling fluid flow and bone shaving removal, reducing heat accumulation during drilling.
Solution Approach 2:
A cooling fluid (intermediary substance) is introduced through channels in the drill bit to cool the cutting edges and reduce heat transfer to the bone. The cooling fluid acts as a mediator between the drill bit and bone, absorbing heat and preventing thermal damage.
2Productivity
If traditional drill bits are used, then drilling can be performed, but drilling time is excessive and efficiency is low
Solution Approach 1:
The drill bit features a curved distal end and straight proximal side that are pre-configured to optimize the drilling trajectory and cutting action. This preliminary geometric configuration reduces drill wander and ensures immediate engagement with the bone surface, eliminating the need for preliminary positioning adjustments and reducing overall drilling time.
Solution Approach 2:
The curved distal end of the drill bit (spheroidal or rounded tip) facilitates smooth initial contact with the bone surface and reduces drill wander during engagement. This curvature allows the drill bit to self-center and maintain stable rotation, improving drilling efficiency and reducing time loss due to drill bit deviation.
3Manufacturing precision
If traditional drill bits are used, then holes can be drilled, but hole roundness is poor and bone integration is compromised
Solution Approach 1:
Different portions of the drill bit have different geometric qualities optimized for specific functions: the curved distal end provides smooth engagement and centering, while the straight proximal side ensures accurate trajectory and round hole formation. The straight flute blades provide uniform cutting action throughout the drilling process, ensuring consistent hole roundness and clean bone surfaces for optimal integration.
Data Source
AI summary
A drill bit for drilling into bone, including at least a first, second and third longitudinally extending substantially straight flute blades, wherein the drill bit has an extrapolated outer profile established by rotation of the first, second and third flute blades 360 degrees about a longitudinal axis thereof, the extrapolated outer profile includes a first surface having tangents more perpendicular than parallel to the longitudinal axis, and the extrapolated outer profile includes a second surface having tangents more parallel than perpendicular to the longitudinal axis.