Single-Flute Surgical Drill Bit for Low-Heat Bone Drilling
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Solution Overview
Problem
Conventional surgical drill bits generate excessive heat during bone drilling, leading to carbonization of bone tissue, which hinders healing and integration with implants or screws.
Innovation Solution
A drill bit design featuring a single main cutting edge with a large rake angle (25° to 40°) and a single spiral flute with a smaller helix angle, minimizing chiseling and efficiently evacuating bone chips, thereby reducing heat production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional drill bits with multiple cutting edges and spiral flutes are used, then drilling capability is sufficient, but excessive heat is generated causing bone tissue carbonization
Solution Approach 1:
The patent changes the geometric parameters of the drill bit by implementing a single main cutting edge with a large rake angle (25°-40°) and a single spiral flute with a smaller helix angle. This parameter optimization reduces the contact area between the drill bit and bone tissue, minimizing friction and heat generation while maintaining effective cutting and chip evacuation capabilities.
Solution Approach 2:
The invention applies different geometric characteristics to different parts of the drill bit: the main cutting edge has a large rake angle for reduced friction and heat, while the spiral flute has a smaller helix angle for effective chip evacuation. This localized optimization of geometric properties allows the drill bit to simultaneously reduce heat generation and maintain drilling efficiency.
2Productivity
If multiple cutting edges are used to improve cutting efficiency, then drilling speed increases, but heat production increases causing tissue damage
Solution Approach 1:
The patent optimizes the cutting edge geometry by using a single main cutting edge with a large rake angle (25°-40°). This geometric parameter change allows the single cutting edge to efficiently remove bone material with reduced friction and heat generation, maintaining drilling productivity while minimizing thermal damage to surrounding tissue.
3Loss of substance
If conventional spiral flute design is used for chip evacuation, then bone chips are removed, but heat is generated from friction between chips and flute walls
Solution Approach 1:
The patent modifies the spiral flute geometry by using a smaller helix angle compared to conventional drill bits. This parameter change optimizes the flute's ability to evacuate bone chips while reducing the frictional contact area and duration between chips and flute walls, thereby minimizing heat generation during chip removal.
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
The custom drill bit significantly lowers temperature elevation, thrust force, and torque, preventing tissue damage and enhancing bone healing by minimizing heat generation during drilling.
Implementation Method 1
heat produced by the drilling can impair the bone tissue around the hole
Implementation Method 2
the chips generated by said cutting are forwarded by the spiral flutes off the bone
Data Source
AI summary
A drill bit (1) for creating a tubular hole in a bone (9), comprises: a longitudinal body (2) extending along an axis (21) and having a proximal end and a distal end (22); a main cutting edge (3) formed at the distal end (22) of the body (2); a main cutting face (4) extending from the main cutting edge (3) and defining a rake angle (α); and a spiral flute (5) formed around the body (2) and extending from the main cutting face (4) along the axis (21) of the body (2). The main cutting edge (3) is the only single main cutting edge (3) of the drill bit (1). The spiral flute (5) is the only single spiral flute (5) of the drill bit. The rake angle (α) is at least 25°. The drill bit (1) according to the invention drill bit allows for minimizing heat production when drilling a hole into the bone.