Dual Component Applicator Mismatch Zone Mixing
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Solution Overview
Problem
Existing methods for mixing cementitious substances for bone and teeth repair are prone to contamination and require precise measurements, with manual mixing being inefficient and lacking in sterility, and previous devices require training and are not effective in maintaining sterility during the mixing process.
Innovation Solution
A dual-component applicator with a mismatch zone between valves and the inner walls of the second chamber allows for fluid flow while preventing the cement particles from passing through, enabling mixing within the applicator without breaking the seal, and excess fluid is automatically removed during compression, ensuring the correct consistency of the cementitious substance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual mixing on a plate is used, then the mixing process is simple and requires no special device, but the method is extremely prone to contamination and requires precise measurements
Solution Approach 1:
The applicator is designed as a disposable single-use device that is pre-filled with pre-cementitious material. This eliminates the need for cleaning and sterilization between uses, ensuring each application is contamination-free while maintaining simplicity. The entire applicator is discarded after one use, preventing any risk of cross-contamination.
Solution Approach 2:
The applicator incorporates a mismatch zone with specific geometric features (non-circular cross-section) that creates a mechanical seal between the valve and chamber walls. This localized structural feature prevents fluid leakage and maintains sterility at the critical mixing interface without complicating the overall device design.
2Object-affected harmful factors
If a dual-component syringe assembly with bypass zone is used, then sterility is maintained during mixing, but the bypass zone requires careful sizing to prevent operator contamination while allowing adequate mixing
Solution Approach 1:
The mismatch zone employs asymmetric geometry where the valve cross-section (circular) does not match the chamber cross-section (non-circular). This asymmetric design creates an effective seal that prevents fluid escape while allowing the valve to move freely for mixing, eliminating the need for a separate bypass zone and its associated sizing complexities.
Solution Approach 2:
The invention extracts the mixing function from a complex dual-chamber syringe system with bypass zones and reduces it to a single-chamber design. The pre-cementitious material is contained in one chamber, and liquid carrier is added directly, with mixing occurring in the same chamber. This extraction simplifies the device structure while maintaining sterility through the mismatch zone seal.
3Manufacturing precision
If the applicator is preloaded with pre-cementitious material, then precise measurements are ensured, but the operator must draw in the correct amount of liquid and judge mixing completion
Solution Approach 1:
The applicator incorporates a rod that mechanically pushes the plunger to automatically draw in the liquid carrier and initiate mixing. This self-service mechanism eliminates the need for the operator to manually control liquid injection timing and amount, reducing skill requirements. The rod's movement automatically triggers the mixing process and maintains consistent liquid-to-powder ratios.
Solution Approach 2:
The mismatch zone creates a mechanical feedback system where the valve's position and movement provide tactile feedback to the operator about mixing progress. As the valve moves through the non-circular chamber, the resistance and movement characteristics change, allowing the operator to judge mixing completion without requiring advanced skill or visual inspection.
4Object-affected harmful factors
If the bypass zone is made smaller to prevent contamination, then operator safety is improved, but the mixing process becomes less effective
Solution Approach 1:
The asymmetric mismatch zone geometry allows the valve to move freely through the chamber for effective mixing while maintaining a tight seal that prevents fluid escape. The non-circular cross-section creates natural contact points between the valve and chamber walls, ensuring adequate mixing action without requiring a large bypass zone that would compromise operator safety.
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 applicator allows for a failsafe, contamination-free mixing process without the need for precise measurements or training, ensuring the correct consistency of the cementitious substance for bone or teeth treatment, reducing the risk of contamination and improving the efficiency of the mixing process.
Implementation Method 1
a mismatch zone between valves and the inner walls of the second chamber allows for fluid flow while preventing the cement particles from passing through
Implementation Method 2
excess fluid is automatically removed during compression, ensuring the correct consistency of the cementitious substance
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3H
AI summary
A mixing applicator 100 for mixing a fluid substance with a solid substance to obtain a resulting substance having a desired consistency, comprises: two valves 114, 116 slidably displaceable within a hollow elongated barrel 102 and sequentially arranged along a longitudinal axis 118, the valves having a third cross-sectional shape being complementary to a first cross sectional shape, thereby providing fluid-tight engagement within the first cross-sectional shape, the third cross-sectional shape being mismatched with a second cross-sectional shape to form a mismatch zone along a length of a chamber, the mismatch zone allowing fluid flow around the valves, thereby to allow the two valves to effect mixing of the fluid substance with the solid substance and subsequently to remove excess fluid to obtain the resulting substance having the desired consistency.