Root Canal File Vibration and Rotation Drive Mechanism

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Solution Overview

Problem

Existing root canal therapy devices face challenges in effectively shaping the root canal while minimizing the formation of a smear layer, which can hinder drug infiltration and increase treatment failure rates.

Innovation Solution

A root canal therapy device that combines mechanical vibration and rotation drive modes, featuring a head with a mandrel part that can rotate and vibrate, driven by first and second flexible drive shafts connected to motors in the handle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a rotary root canal therapy apparatus is used to shape the root canal, then the root canal molding efficiency and molding effect are improved, but a smear layer is formed on the wall of the root canal due to frictional heat and scraping action

Engineering Contradiction:

Improveroot canal molding efficiencyVSAvoidsmear layer formation

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent combines the rotary root canal therapy apparatus and ultrasonic root canal therapy apparatus into a single integrated device. The head can switch between rotary mode (for efficient shaping) and ultrasonic vibration mode (for smear layer removal), allowing both functions to be performed sequentially without changing equipment

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces a switching mechanism that allows the head to dynamically change between rotary and ultrasonic vibration modes during the root canal preparation process. This enables the system to adapt its function based on the current treatment stage - using rotary mode for shaping and ultrasonic mode for cleaning

Inventive Principle:

Principle #15Dynamics

2Object-generated harmful factors

If an ultrasonic root canal therapy apparatus is used to remove the smear layer, then the cleaning effect is improved, but the capacity to shape the root canal is unsatisfying and may cause local damage or side penetration

Engineering Contradiction:

Improvesmear layer removalVSAvoidroot canal shaping precision

Core Design Contradiction:

Object-generated harmful factorsVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent divides the root canal preparation process into two distinct stages performed by the same device: shaping stage (using rotary mode) and cleaning stage (using ultrasonic mode). This segmentation allows each function to be optimized independently while being integrated in one apparatus

Inventive Principle:

Principle #1Segmentation

3Force

If a root canal file with a large cutting angle is used to cut the root canal wall, then the cutting action is effective, but frictional heat is generated and organic matter denaturation occurs leading to smear layer formation

Engineering Contradiction:

Improvecutting action effectivenessVSAvoidfrictional heat generation

Core Design Contradiction:

ForceVSTemperature

Solution Approach 1:

The patent applies ultrasonic vibration to the root canal file during the cleaning stage. The high-frequency vibrations reduce friction between the file and root canal wall, thereby reducing frictional heat generation and preventing the denaturation of organic matter that leads to smear layer formation

Inventive Principle:

Principle #18Mechanical vibration

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 device enables the root canal file to rotate and vibrate simultaneously, reducing cutting resistance and temperature, avoiding smear layer formation, and improving the quality and efficiency of root canal preparation.

Implementation Method 1

a first drive motor and a second drive motor are disposed on the handle, the first drive motor is connected to the first drive input shaft part through the first flexible drive shaft

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 2

the second drive motor is connected to the second drive input shaft part through the second flexible drive shaft, and the second drive input shaft part is connected to the mandrel part and drives the mandrel part to vibrate mechanically

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 3

The device enables the root canal file to rotate and vibrate simultaneously, reducing cutting resistance and temperature

Methodology Applied

Scientific EffectMechanical vibration: Vibration

Data Source

PatentUS12232921B2Root canal therapy device with mechanical vibration mode and rotation drive mode

Publication Date: 2025.02.25 SHENZHEN SUPERLINE TECH CO LTD

AI summary

A root canal therapy device with a mechanical vibration mode and a rotation drive mode includes a head, a handle, a first flexible drive shaft and a second flexible drive shaft. The head includes an outer main part, a mandrel part for mounting a root canal file, a first drive input shaft part and a second drive input shaft part. The mandrel part is mounted in the outer main part. A first drive motor and a second drive motor are disposed on the handle. The invention has the following beneficial effects: the root canal file can rotate and vibrate during root canal preparation, so that the wall of a root canal is efficiently cut by the file; and the file can also vibrate, so that cutting resistance and cutting temperature are effectively reduced, a smear layer is avoided, and the quality and efficiency of root canal preparation are improved.