Dental Handpiece Automatic Reverse Rotation for Blade Bite Release
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Solution Overview
Problem
Existing dental treatment apparatuses face challenges in easily releasing a cutting tool from a root canal due to the complexity of switching from forward rotation to reverse rotation or twist driving, especially when the tool bites into the canal wall, leading to potential tool breakage and operational burdens for operators.
Innovation Solution
A dental treatment apparatus with a handpiece, drive unit, and controller that allows forward and reverse rotation driving, where the operation receiving unit sets the operation button for reverse rotation or twist driving only when specific conditions are met, such as the tool being driven and load torque exceeding a reference, simplifying the bite releasing process without the need for a dedicated operation button.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotation of the cutting tool is forcibly stopped when load torque reaches reference torque to prevent breakage, then tool breakage is prevented, but the cutting tool cannot be readily pulled out from the root canal due to blade bite
Solution Approach 1:
The system automatically switches to reverse rotation driving when the cutting tool bites into the root canal wall, without requiring manual intervention. The controller detects the bite condition and autonomously changes the driving mode to release the blade from the canal wall, making the system self-service in resolving the operational difficulty.
Solution Approach 2:
The system changes the rotation direction parameter from forward rotation to reverse rotation when bite is detected. This parameter change enables the cutting tool to be pulled out from the root canal by rotating in the opposite direction, thereby resolving the sticking issue caused by blade bite.
2Ease of operation
If reverse rotation driving or twist driving is used to release the bite of the cutting tool, then the cutting tool can be pulled out from the root canal, but complicated operations such as changing the driving mode are required
Solution Approach 1:
The system automatically switches to reverse rotation driving when the cutting tool bites into the root canal wall, without requiring manual intervention. The controller detects the bite condition and autonomously changes the driving mode to release the blade from the canal wall, making the system self-service in resolving the operational difficulty.
Solution Approach 2:
The controller monitors the load torque during cutting operation and uses this feedback to detect when the cutting tool bites into the root canal wall. Based on this feedback, the controller automatically switches to reverse rotation driving mode, creating a closed-loop control system that simplifies operation.
3Ease of operation
If the cutting tool is driven by reverse rotation driving or twist driving to release bite, then the cutting tool can be pulled out, but the operation becomes significantly burdensome for operators not used to the apparatus
Solution Approach 1:
The system automatically switches to reverse rotation driving when the cutting tool bites into the root canal wall, without requiring manual intervention. The controller detects the bite condition and autonomously changes the driving mode to release the blade from the canal wall, making the system self-service in resolving the operational difficulty.
Solution Approach 2:
The system performs the reverse rotation action automatically when bite is detected, eliminating the need for operators to learn and execute complex manual procedures. The preliminary setup of automatic detection and response reduces the learning curve and operational burden.
4Ease of operation
If a dedicated operation button for reverse rotation is always available, then releasing bite is simplified, but the device requires additional buttons and increased complexity
Solution Approach 1:
The existing operation button on the handpiece is given multiple functions: it controls forward rotation during normal cutting, and automatically triggers reverse rotation when bite is detected. This multi-functionality eliminates the need for a dedicated reverse rotation button, reducing device complexity while maintaining ease of operation.
Solution Approach 2:
The functions of forward rotation control and reverse rotation release are merged into a single operational interface. The controller integrates the bite detection and mode switching logic, combining multiple functions into one unified system that reduces the number of physical buttons required.
Data Source
AI summary
A dental treatment apparatus includes: a handpiece including a head that holds a cutting tool; a drive unit capable of performing forward rotation driving for rotating the cutting tool held at the head in a cutting direction, and reverse rotation driving for rotating the cutting tool held at the head in a non-cutting direction; an operation receiving unit that receives an operation of an operator; and a controller that controls the drive unit that drives the cutting tool, according to the operation received by the operation receiving unit. Only when a prescribed condition is satisfied, the controller sets the operation received by the operation receiving unit as an operation to drive the cutting tool by reverse rotation driving, or as an operation to drive the cutting tool by twist driving by which the forward rotation driving and the reverse rotation driving are alternately performed.