Ultrasonic Bone Cutter Head Linear Toothed Edge Design
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Solution Overview
Problem
Conventional tool bits for ultrasonic osteotomes have sharp teeth that can cause tissue injury, are prone to being clamped by bone tissues and broken, leading to a short service life and high manufacturing costs due to complex shapes.
Innovation Solution
A tool bit with a flat, straight toothed edge and evenly spaced recesses, a smooth arcuate connection, and liquid guiding grooves to reduce tissue injury and prevent clamping, featuring a rounded corner structure and equal thickness of cutting and back edges for enhanced safety and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool bit has a long tip portion with teeth distributed on a curved surface, then the cutting capability is improved, but the tool bit is easy to be clamped by bone tissues and broken, resulting in short service life
Solution Approach 1:
The patent inverts the conventional curved tooth arrangement into a straight linear arrangement. The end portion is designed with a straight end edge instead of a curved surface, and teeth are distributed linearly along this straight edge. This inversion prevents the tool bit from being clamped by bone tissues while maintaining cutting effectiveness, thereby extending service life.
Solution Approach 2:
The patent applies curvature in a controlled manner by designing an arcuate transition between the straight end edge and the side edges, creating a smooth rounded corner structure. This selective use of curvature prevents stress concentration at sharp corners while maintaining the overall straight configuration that prevents clamping.
2Force
If the tool bit has a long tip portion with teeth on a curved surface, then the cutting force can be applied, but the sharp structure may scrape and hurt other tissues during cutting
Solution Approach 1:
The patent inverts the sharp curved tooth structure into a straight edge configuration. The straight end edge with linearly distributed teeth avoids the scraping and hurting of soft tissues that occurs with curved sharp structures, while still enabling effective bone cutting through the linear tooth arrangement.
Solution Approach 2:
The patent applies different geometric qualities to different parts of the tool bit: the end edge is straight for preventing tissue injury, while the transition zones have arcuate rounded corners for stress distribution. This local differentiation of geometric properties optimizes both cutting performance and tissue safety.
3Productivity
If the tool bit has a complicated shape to achieve the above functions, then the cutting performance is improved, but it is difficult for machining and has high manufacture cost
Solution Approach 1:
The patent simplifies the complex curved geometry into a straight linear configuration with uniform tooth distribution. This inverted simple geometry is much easier to manufacture through conventional machining processes, reducing manufacturing costs while maintaining cutting performance through the effective straight-edge tooth design.
Solution Approach 2:
The patent changes the geometric parameters from complex curved surfaces to simple straight lines and uniform arcs. This parameter simplification makes the tool bit easier to machine and manufacture, reducing complexity while preserving the essential cutting function through the linear tooth arrangement.
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 linear toothed edge reduces tissue injury, prevents clamping by bone tissues, and extends the tool bit's service life while improving surgical safety and reducing manufacturing costs through a more straightforward design.
Implementation Method 1
a bit body (1) connected with an ultrasonic equipment
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed is a tool bit for an ultrasonic osteotome, including a bit body (1) connected with an ultrasonic equipment, an arbor (2) fixed to the bit body (1), and a flat end portion (3) of the tool bit fixed to the arbor (2). End portion (3) of the tool bit includes a toothed edge (4) extending linearly along a length direction of end portion (3) of the tool bit, and a plurality of recesses (5) are distributed evenly on toothed edge (4) to form teeth (6) spaced apart from each other. According to the present invention, toothed edge (4) of end portion (3) extends linearly along a length direction, the cutting edges of teeth (6) are distributed linearly instead of having a sharp structure, thus will not scrape and hurt other tissues during cutting. Since the thickness of the cutting edge is set to be the same as that of the back edge, when cutting bone tissues, the incision is wide and thus the end portion is not easy to be clamped by the bone tissues, which effectively prevents the end portion from breaking and reduces occurrence chances of surgery accidents.