Negative-Pressure Microcannula for Root Canal Cleaning
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Solution Overview
Problem
Current root canal cleaning techniques fail to adequately deliver and activate irrigation liquid to the apical third of the canal, leading to incomplete cleaning and potential tissue damage due to extrusion of the solution, and existing devices are costly and complex.
Innovation Solution
A single polymer cannula designed for simultaneous irrigation, ultrasonic activation, and evacuation, which uses negative pressure to safely deliver and activate irrigation liquid without apical pressure, utilizing ultrasonic or sonic energy to enhance cleaning efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional syringe and open-ended cannula irrigation is used, then irrigation liquid can be delivered to the canal, but high flow rate and cannula wedging increase pressure at the apical portion causing irrigant extrusion and tissue damage
Solution Approach 1:
The patent inverts the traditional positive pressure irrigation approach by using negative pressure (suction) to deliver and activate irrigant. The ultrasonic tip creates negative pressure that draws irrigant into the canal and activates it through cavitation, eliminating the high pressure that causes extrusion while maintaining effective cleaning.
Solution Approach 2:
The patent replaces the mechanical syringe-cannula system with an ultrasonic tip system that uses acoustic energy to deliver and activate irrigant. The ultrasonic vibrations create cavitation bubbles that collapse to produce mechanical cleaning action and activate the irrigant chemically, substituting the mechanical pushing action with acoustic field-based activation.
2Productivity
If conventional syringe and open-ended cannula irrigation is used, then irrigation can be performed, but a large number of debris remain clogged in the irregularities of the root canal system
Solution Approach 1:
The patent applies ultrasonic mechanical vibration through the tip to activate the irrigant and create cavitation. The high-frequency vibrations (20-100 kHz) produce acoustic streaming and cavitation bubbles that penetrate into canal irregularities, dramatically improving the cleaning of debris from complex canal geometries compared to static syringe irrigation.
Solution Approach 2:
The patent changes the physical parameters of irrigant delivery by using negative pressure instead of positive pressure, and by introducing ultrasonic frequency vibrations. These parameter changes transform the irrigant from a passive flushing medium into an actively vibrating, cavitation-producing cleaning agent that effectively reaches canal irregularities.
3Object-affected harmful factors
If closed-ended cannulas are used to reduce liquid pressure, then irrigant flow rate decreases, but there is no unanimous definition of low flow rate and subjective estimation is required
Solution Approach 1:
The ultrasonic tip system is self-regulating in terms of pressure control. The negative pressure generation and ultrasonic activation occur automatically when the device is activated, eliminating the need for clinician judgment about flow rate. The system self-adjusts to maintain safe pressure levels while effectively delivering and activating irrigant.
Solution Approach 2:
The patent replaces the manual syringe-based mechanical irrigation system with an ultrasonic-driven system that uses acoustic energy to control irrigant delivery. This substitution eliminates the need for subjective flow rate estimation by using a standardized ultrasonic activation mechanism that inherently controls pressure and activation parameters.
4Productivity
If mechanical instrumentation is used to clean root canals, then bulk pulp tissue and debris can be removed, but substantial parts of the root canal wall remain untouched and mechanical files cannot completely clean the canal
Solution Approach 1:
The patent substitutes mechanical file-based cleaning with ultrasonic acoustic field-based cleaning. The ultrasonic vibrations create cavitation bubbles that collapse against the canal walls, producing micro-jets and shock waves that clean surfaces that mechanical files cannot reach, including complex irregularities and lateral canals.
Solution Approach 2:
The patent uses high-frequency ultrasonic vibration (20-100 kHz) to activate the irrigant and create cavitation. This mechanical vibration energy penetrates into canal irregularities and produces acoustic streaming that continuously flushes debris from all canal surfaces, providing more complete cleaning than static mechanical instrumentation.
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 polymer cannula effectively cleans the entire root canal system, including the apical third, while preventing extrusion and tissue damage, at a lower cost and with improved safety compared to existing methods.
Implementation Method 1
The tip is inserted into the root canal and ultrasonic or sonic energy is applied to the irrigation liquid
Implementation Method 2
The ultrasonic activation of irrigants creates acoustic microstreaming and transient cavitation that push the irrigant laterally into the irregularities of the canal
Implementation Method 3
A single polymer cannula designed for simultaneous irrigation, ultrasonic activation, and evacuation, which uses negative pressure to safely deliver and activate irrigation liquid
Data Source
AI summary
An endodontic microcannula system for evacuation of root canal contents from a root canal of a patient. The system includes a microcannula for insertion into the root canal, a handpiece for vibrating the microcannula while it is disposed within the root canal, and an irrigation fluid reservoir for supplying irrigation fluid to the root canal, an a vacuum source for drawing the fluid and root canal debris into the microcannula and out of the root canal.