Segmented Drill Head Pendulum Stroke for Low-Force Bone Drilling
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Solution Overview
Problem
Conventional drilling systems, such as those using twist drills, face limitations in medical applications due to the inability to drill through skin and the issue of local heating, and alternative systems with two drill bits experience uncontrolled movements and high axial forces.
Innovation Solution
A drilling system employing a tool with three or more drilling segments driven in a sequential pendulum stroke principle, allowing for controlled drilling with reduced axial force and enabling the creation of bores with non-round cross-sectional contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a twist drill is used for drilling, then a rotating cutting motion can be achieved, but the drill cannot be used for drilling through skin and localized heating occurs
Solution Approach 1:
The drill bit is divided into multiple drilling segments (at least three) that can be sequentially activated. This segmentation allows the system to perform pendulum stroke movements rather than continuous rotation, eliminating localized heating while enabling use in medical applications such as drilling through skin and bone.
Solution Approach 2:
The drilling segments are driven in a predetermined successive sequence creating periodic pendulum stroke movements. This periodic action replaces continuous rotation with intermittent cutting strokes, preventing heat buildup while maintaining effective material removal through repeated impact and cutting cycles.
2Adaptability or versatility
If a drilling system with two drill tips is used, then an alternative to spiral drilling is achieved, but uncontrolled movement is exerted on the workpiece and high axial force is required
Solution Approach 1:
The system uses at least three drilling segments instead of two, creating a more balanced distribution of cutting forces. This segmentation enables better control of the workpiece while reducing the axial force requirement through the pendulum stroke mechanism where segments are sequentially engaged and disengaged.
Solution Approach 2:
The sequential activation of drilling segments in a predetermined pattern creates periodic pendulum strokes that reduce peak axial forces. By alternating which segments are active, the system distributes the loading over time rather than requiring all segments to engage simultaneously, thereby reducing the maximum axial force needed.
3Adaptability or versatility
If a drilling system with two drill tips is used, then an alternative to spiral drilling is achieved, but uncontrolled movement is exerted on the workpiece
Solution Approach 1:
Dividing the drill into at least three segments allows for more stable workpiece control. The segmented design with sequential activation creates a more balanced force distribution that prevents uncontrolled workpiece movement while maintaining drilling effectiveness.
Solution Approach 2:
The periodic sequential activation of drilling segments creates a controlled rhythm of cutting forces. This periodic action stabilizes workpiece positioning by alternating which segments engage, preventing the uncontrolled movements that occur with two-tip systems while maintaining drilling progress.
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
This solution enables controlled drilling with lower axial force, prevents heat generation, and allows for drilling in materials like skin and bone, offering a wide range of applications beyond traditional round bores.
Implementation Method 1
the individual drill segments are driven in a predetermined successive sequence according to the pendulum stroke principle
Data Source
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Figure 4a~5c
Figure 6a
AI summary
The invention relates to a drilling system and drilling tool with a drilling instrument (12) which has a drive (18) which drives a drilling tool (14) comprising a split drill tip (29), wherein the drilling tool (14) has three or more drill segments forming a drill head (31) with a common drill tip, wherein each drill segment can be driven independently of the adjacent drill segment according to the pendulum stroke principle, or the drilling tool (14) has two drill segments (29) forming a drill head (31) with a common drill tip (27), and has an outer circumference that deviates from a circular cross-section, as well as a method for driving a drilling tool of such a drilling system.