Dental Mixing Capsule Double Piston Sealing
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Solution Overview
Problem
Existing mixing and application capsules for dental preparations face issues such as incomplete liquid dispensing, diffusion losses, and evaporation, leading to inaccurate mixing ratios and reduced storage life due to inadequate sealing and design limitations.
Innovation Solution
A telescopic cylinder design with a double-piston mechanism, where the first piston body acts as a plunger to press out contents and the second piston body has a cavity for the liquid, ensuring precise liquid delivery and preventing evaporation, with a hermetically sealed liquid capsule and a gas-impermeable film to maintain the liquid's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a foil bag is used to accommodate the liquid, then the liquid can be contained and delivered, but the film creases when pressed together, causing liquid to remain in folds and resulting in imprecise dosing
Solution Approach 1:
The invention extracts the liquid from the flexible foil bag and places it into a rigid cartridge that is integrated with the piston assembly. This eliminates the creasing problem of flexible bags while maintaining liquid containment and delivery capabilities.
Solution Approach 2:
The liquid delivery system is segmented into distinct functional components: a rigid cartridge for liquid containment, a piston for controlled displacement, and an integrated needle for delivery. This segmentation allows each component to perform its function optimally without the compromises required by a single integrated foil bag.
2Quantity of substance
If a film bag with larger diameter is arranged on or at the side of the capsule body, then more liquid can be accommodated, but a separate activation tool is required and proportionately more liquid remains in the bag
Solution Approach 1:
The invention merges the liquid container (cartridge) with the piston assembly into a single integrated unit. The piston is directly connected to the cartridge, allowing both liquid containment and activation mechanisms to be combined in one component structure.
Solution Approach 2:
The piston assembly serves multiple functions: it acts as both the activation mechanism (by being pushed to dispense liquid) and the delivery mechanism (through the integrated needle). This multi-functionality eliminates the need for separate activation tools while maintaining simple operation.
3Ease of operation
If a rubbing seal is used between pistons to allow manual movement, then the second piston can be moved relative to the first piston, but the seal is not sufficient and liquid can evaporate
Solution Approach 1:
The invention extracts the liquid from the piston clearance spaces by providing dedicated sealed containment (the cartridge) and active displacement (the piston). This eliminates the need for relying on rubbing seal integrity for liquid containment while maintaining manual operability.
4Reliability
If the seal is made tight to prevent liquid evaporation, then evaporation through the seal is almost completely avoided, but the second piston can only be moved by applying a great deal of force
Solution Approach 1:
The invention extracts the liquid containment function from the piston seal interface and places it in a dedicated sealed cartridge. This allows the piston to move with minimal force while the cartridge's rigid seal prevents liquid evaporation, decoupling the sealing requirement from the movement resistance.
5Productivity
If the thin-walled frangible area of the piston wall is used for liquid penetration, then the liquid can flow into the mixing chamber, but the area is easy for liquid to penetrate and the powdered component can absorb moisture
Solution Approach 1:
The invention extracts the liquid from the piston assembly entirely and places it in a sealed cartridge that remains closed during storage. The frangible barrier is only engaged when the cartridge is intentionally activated, preventing premature liquid exposure and moisture absorption by the powder.
Solution Approach 2:
The cartridge is pre-sealed and the liquid is pre-contained in a stable state during storage. The frangible barrier is designed to remain intact until activation, at which point the barrier is deliberately breached to initiate liquid flow. This preliminary sealing ensures storage stability while enabling rapid liquid delivery when needed.
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 ensures precise mixing ratios, reduces liquid loss and evaporation, and allows for longer storage life of the dental preparation, while simplifying the activation and application process without the need for additional tools.
Implementation Method 1
a gas-permeable filter membrane which is impermeable to the mixing component in the mixing chamber and is arranged in at least part of the outer wall of the piston body
Implementation Method 2
the seal between capsule body and first piston body has ventilation slots for discharging a gas from the mixing space of the capsule body
Implementation Method 3
the liquid capsule being closed with an aluminum foil, the aluminum foil being coated on at least one side so that it can be sealed
Implementation Method 4
The sealing layer preferably consists of a heat-sealing lacquer
Implementation Method 5
the projection of the first piston body has a cutting edge for cutting open the film
Implementation Method 6
the liquid is discharged into the channel
Implementation Method 7
the first piston body acts as a plunger to press out contents and the second piston body has a cavity for the liquid, ensuring precise liquid delivery
Implementation Method 8
When the mixing and application capsule is activated, a relative movement is carried out between the first and second piston bodies, with the projection of the first piston body acting as a plunger
Implementation Method 9
a mixing space for receiving a mixing component and for mixing the dental preparation from the mixing component and a liquid
Data Source
AI summary
The invention relates to a mixing and application capsule for the production and dispensing of a dental preparation.To prevent fluid loss, the invention proposes a mixing and application capsule for producing a dental preparation, comprising: a capsule body (31) with a mixing chamber (32) for receiving a mixing component (41) and for mixing the dental preparation (43) from the mixing component (41) and a fluid (42), and with an outlet opening (33) for dispensing the dental preparation (43); a first piston body (11) displaceable within the capsule body (31), which delimits the mixing chamber (32) within the capsule body (31) and has a channel (19) for guiding the fluid (42) from a cavity (25) into the mixing chamber (32) and a projection (12); and a second piston body (21) displaceable within the capsule body (31) relative to the first piston body (11), which has a cavity (22) for receiving the fluid (42), wherein the cavity (22) is designed to accommodate the projection (12) of the first piston body (11).