Dental Material Dispensing Piston With Elastic Resetting Mechanism
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Solution Overview
Problem
Existing dental material dispensing devices face issues with incomplete discharge and contamination due to the elasticity of viscous materials, leading to dripping and poor sealing, especially when handling viscous and slightly viscous substances.
Innovation Solution
A dispensing device with a cylindrical body and a piston system featuring an elastic resetting device that creates a partial vacuum to prevent dripping, using a case-shaped piston with a stop to ensure secure guidance and sealing, and a diaphragm that can deform independently to maintain a secure sealing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotary piston is used to squeeze out viscous dental materials, then the material can be dispensed, but the piston may not return to stable position and material may remain outside the tip causing contamination
Solution Approach 1:
The piston system is segmented into a piston rod and a separate elastic resetting device (elastic element), allowing independent function of each component. The elastic element specifically handles the resetting function while the piston rod handles material dispensing, resolving the reliability issue of incomplete return.
Solution Approach 2:
An elastic resetting device acts as an intermediary mechanism between the piston rod and the cartridge body. This elastic element mediates the force transmission and ensures the piston rod returns to its initial position, preventing material contamination while maintaining dispensing capability.
2Productivity
If the diaphragm element is deformed by actuating the piston towards the front, then material can be squeezed out, but the diaphragm element is pulled inside allowing foreign substances to flow into the clearance destroying sealing
Solution Approach 1:
The sealing function is extracted from the diaphragm element and assigned to a dedicated sealing ring. This separation allows the diaphragm to focus on material transmission while the sealing ring maintains the sealing effect, preventing foreign substances from entering the clearance.
Solution Approach 2:
Different parts of the piston system have specialized local properties: the diaphragm element has elastic properties for material deformation, while the sealing ring has friction properties for maintaining sealing. This local quality differentiation resolves the contradiction between squeezing capability and sealing reliability.
3Stability of the object's composition
If friction is increased between diaphragm element and cartridge wall for guidance, then guidance is provided, but the diaphragm element gets pulled inside allowing material to enter clearance
Solution Approach 1:
A sealing ring acts as an intermediary between the diaphragm element and the cartridge wall. It provides the necessary friction for guidance and stability while preventing material from entering the clearance, thus maintaining the sealing effect.
Solution Approach 2:
The sealing ring is designed as a simple, replaceable component that can be easily manufactured and replaced. This allows for reliable sealing without complex structures, resolving the guidance-stability issue while maintaining sealing integrity.
4Productivity
If pressure is applied to squeeze out material, then dispensing is achieved, but excess material drips from the application device
Solution Approach 1:
The elastic resetting device applies a preliminary counter-action force to the piston rod, creating a partial vacuum in the cartridge body that prevents excess material from dripping. This anti-action is applied continuously to counterbalance the squeezing pressure.
Solution Approach 2:
The pressure parameters inside the cartridge body are dynamically changed through the elastic resetting device. During dispensing, pressure increases to push material out; during reset, pressure decreases to create partial vacuum, preventing dripping. This parameter cycling resolves the contradiction between dispensing rate and material loss.
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 effectively prevents excess material from dripping and ensures a secure sealing effect, allowing for the safe handling of both fluid and viscous dental materials without contamination, even under pressure.
Implementation Method 1
dripping of excess dental material from the application device is prevented by creating a partial vacuum inside the cylindrical body, with the elastic resetting device pressing the piston rod in a direction opposite the squeezing direction
Implementation Method 2
An elastic resetting device is disposed at a front end area of the piston and positioned in the direction towards the dental material, wherein the elastic resetting device is adaptable to be biased in the squeezing direction and to return back to a relaxed position after the end of each axial movement of the piston in the squeezing direction
Data Source
AI summary
An application device with a cylindrical basic body for storing a squeezable dental material having a piston positioned inside the basic body and axially displaceable towards the basic body. A piston rod serves to displace the piston in the squeezing direction, which piston rod partially reaches into the piston and is axially displaceable towards the latter. The piston is provided with an elastic resetting device at its front end area positioned in the direction towards the dental material. The elastic resetting device can be biased in the squeezing direction, and returns back to its relaxed position after the end of each axial movement of the piston in the squeezing direction and release of the pressure exerted on the piston rod for this purpose.