High-Density Turbine Rotor for Medical Cutting Stability
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Solution Overview
Problem
Turbine rotors made of aluminum in medical cutting instruments experience rapid rotation speed increases, leading to increased bearing load and reduced cutting power due to low inertia moment, which can result in stalling during cutting operations.
Innovation Solution
Use a turbine rotor formed of a metal with a density of 4.0 g/cm³ or more, optionally with a counterweight and a quick stop mechanism, to stabilize rotation speed and maintain cutting power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a turbine rotor is made of aluminum for ease of processing, then manufacturing complexity is reduced, but the inertia moment during rotation becomes small causing rapid rotation speed increase and increased bearing load
Solution Approach 1:
The patent changes the material parameter (density) of the turbine rotor from aluminum to a metal with density of 4.0 g/cm³ or more. This parameter change increases the inertia moment, which stabilizes rotation speed and reduces bearing load, while still maintaining ease of manufacture through proper material selection and processing methods.
2Ease of manufacture
If a turbine rotor is made of aluminum, then manufacturing cost is reduced, but cutting power decreases due to rapid rotation speed increase and stalling under cutting load
Solution Approach 1:
The patent changes the density parameter of the turbine rotor material to 4.0 g/cm³ or more, which increases the inertia moment. This prevents rapid rotation speed increase and stalling under cutting load, thereby maintaining cutting power while keeping manufacturing costs reasonable through efficient material utilization and processing.
3Weight of moving object
If a turbine rotor is made of aluminum, then weight is reduced, but rotation speed control becomes difficult leading to rapid speed increase
Solution Approach 1:
The patent optimizes the weight parameter by selecting a metal with density of 4.0 g/cm³ or more, which provides appropriate weight for the turbine rotor. This increased weight corresponds to increased inertia moment, which improves rotation speed control by preventing rapid speed increases while maintaining reasonable overall weight through efficient design.
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 solution reduces rapid rotation speed increases and prevents stalling, maintaining cutting power by increasing inertia moment and incorporating a quick stop mechanism to brake the turbine rotor effectively.
Implementation Method 1
its inertia moment during rotation is small, which makes the rotation speed prone to rapid increase
Implementation Method 2
a quick stop mechanism for braking the turbine rotor
Data Source
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AI summary
Provided are a turbine rotor of a rotary cutting instrument and a rotary cutting instrument having a turbine rotor with which it is possible to reduce a sharp increase in the rotational speed of a turbine rotor and to suppress a reduction in cutting power due to a loss of speed when a cutting load is input during rotation of the turbine rotor. A turbine rotor (42) of an air-turbine handpiece (1) is formed of a metal having a density greater than or equal to 4.0 [g/cm3].