Nozzle System with Liquid Encasement for Dental Blasting

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Solution Overview

Problem

Nozzle systems in powder blasting devices often cause excessive abrasivity when treating dental surfaces, potentially harming dentine, while making the powder softer to reduce abrasivity counteracts the device's primary function of removing stains and dental deposits.

Innovation Solution

The nozzle system comprises a first nozzle element with an acceleration part and a spreading part, where the spreading part has a larger cross section than the acceleration part, and a second nozzle element that surrounds the first to form a channel for a liquid stream, which encases the powder-gas mixture stream, reducing abrasivity without compromising efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the powder is made softer to reduce abrasivity, then the tooth surface is protected from harm, but the efficiency of removing stains and dental deposits decreases

Engineering Contradiction:

Improveabrasivity to dentineVSAvoidefficiency of removing stains and dental deposits

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The invention changes the geometric parameters of the nozzle system, specifically the cross-sectional area of the acceleration part and the expansion ratio to the spreading part. By optimizing these parameters, the powder particles are accelerated to appropriate velocities that reduce abrasivity while maintaining cleaning efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces dynamic control of the powder-gas mixture through the acceleration and spreading parts of the nozzle. The varying cross-section creates dynamic pressure and velocity changes that optimize particle delivery, reducing harmful abrasion while preserving stain removal capability.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the cross section of the powder-gas mixture stream is increased to reduce abrasivity, then the cleaning surface is enlarged and abrasivity is reduced, but the noise generated outside the nozzle system increases

Engineering Contradiction:

ImproveabrasivityVSAvoidnoise

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The invention converts the potentially harmful noise generation outside the nozzle into a beneficial phenomenon by designing the spreading part to generate a sound shock inside the nozzle system. This internal shock wave generation reduces the noise that would otherwise be produced externally, making the procedure more comfortable for both operator and patient.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If the liquid stream is used to encase the powder-gas mixture stream, then dust is trapped and mist is avoided, but the amount of liquid required increases

Engineering Contradiction:

Improvedust and mist controlVSAvoidamount of liquid

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The invention optimizes the parameters of the liquid stream, including flow rate, pressure, and distribution pattern through the channel. By carefully controlling these parameters, the liquid efficiently traps dust and suppresses mist with minimal quantity, reducing waste and improving operational efficiency.

Inventive Principle:

Principle #35Parameter changes

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

This design reduces the abrasivity of the output stream, allowing for effective removal of stains and dental deposits without harming dental surfaces, while also reducing noise and the risk of emphysema, and minimizing the amount of liquid needed.

Implementation Method 1

particles of the powder-gas mixture are accelerated inside the acceleration part for gaining speed

Methodology Applied

Scientific EffectAcceleration:

Implementation Method 2

In the following spreading part the effective flow-cross-section of the powder-gas mixture is increased by the enlarged second cross section of the spreading part

Methodology Applied

Scientific EffectFlow expansion:

Implementation Method 3

The liquid stream encasing the powder-gas mixture stream is provided for trapping dust generated and to avoid mist during operation

Methodology Applied

Scientific EffectEncasement and trapping:

Data Source

PatentUS12220788B2Nozzle system, powder blasting device and method for using a nozzle system

Publication Date: 2025.02.11 FERTON HOLDING SA

AI summary

Nozzle system for a powder blasting device including a first nozzle element for transporting a powder-gas mixture stream along a transporting direction and a second nozzle element, where the second nozzle element surrounds the first nozzle element such that at least one channel is formed between the first nozzle element and the second nozzle element, where the channel is provided for transporting a liquid stream, where the first nozzle element and the second nozzle element are arranged such that in operation the powder-gas-mixture stream ejected by the first nozzle element is encased by the liquid stream ejected by the channel for forming an output stream of the nozzle system, where the first nozzle element has an acceleration part having a first cross section and a spreading part having a second cross section, where the spreading part is arranged downstream of the acceleration part.