Disposable Prophy Device Flexible Paste Chamber Gearless Drive
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Solution Overview
Problem
Conventional dental polishing devices require frequent refilling of polishing paste, leading to extended treatment times, increased risk of contamination, and gear failure due to complex and costly designs.
Innovation Solution
A disposable prophy device with a flexible paste chamber that automatically dispenses polishing paste based on pressure applied to the teeth, eliminating the need for gears and manual refilling, and functioning with either forward or reverse motor direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional prophy devices with manual refilling are used, then device complexity is reduced, but productivity decreases due to frequent interruptions for refilling
Solution Approach 1:
The polishing paste is pre-loaded into a reservoir integrated with the prophy cup, eliminating the need for frequent manual refilling interruptions. The paste is contained in a flexible chamber that is prepared in advance and automatically dispensed during the polishing procedure.
Solution Approach 2:
The flexible paste chamber is nested within the prophy cup assembly, with the paste reservoir integrated into the cup structure. This nested configuration allows the paste to be contained and automatically dispensed through the cup during rotation, combining multiple functions in a compact integrated design.
2Loss of time
If conventional prophy devices require frequent refilling, then device simplicity is maintained, but loss of time increases due to repeated interruptions
Solution Approach 1:
The paste is pre-loaded into the integrated reservoir before the procedure begins, allowing continuous polishing without time-consuming interruptions for refilling. The flexible chamber is prepared in advance to hold sufficient paste for the entire treatment.
Solution Approach 2:
The integrated paste reservoir enables continuous polishing action by automatically dispensing paste through the rotating prophy cup throughout the entire procedure, eliminating the discontinuities and interruptions inherent in manual refilling systems.
3Reliability
If manual refilling of prophy cup is performed, then device simplicity is maintained, but reliability decreases due to increased contamination risk
Solution Approach 1:
The paste reservoir and prophy cup are merged into a single integrated assembly, eliminating the need for the dentist to manually remove and refill the cup. This combination maintains a closed system throughout the procedure, reducing the risk of cross-contamination between patients.
Solution Approach 2:
The continuous operation without removing the instrument from the patient's mouth maintains a closed sterile field, preventing exposure to saliva, food debris, and blood-borne pathogens that would occur during repeated instrument removal and refilling.
4Reliability
If plastic gears are used in prophy devices, then ease of manufacture is improved, but reliability decreases due to gear failure at high speed
Solution Approach 1:
The plastic gears are completely removed from the device design. The motor-driven shaft directly rotates the prophy cup assembly without any intermediate gear mechanisms, eliminating the reliability problems associated with gear failure at high speeds.
Solution Approach 2:
The complex mechanical gear transmission system is replaced with a direct-drive mechanical configuration where the motor shaft directly rotates the prophy cup. This substitution eliminates the need for gear meshing and reduces mechanical complexity while improving reliability.
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 device provides continuous polishing without interruptions, reduces contamination risks, and lowers costs by eliminating gear failures and manual refilling, while maintaining ergonomic design and efficiency.
Implementation Method 1
As the prophy cup contacts a tooth, the resistance experienced by the cup is transferred to the paste chamber such that the paste chamber tends to contract around itself causing paste to be forced from the paste chamber and into the prophy cup
Data Source
AI summary
A prophy device incorporating a shaft and one or more corrugated members eliminates the need for plastic gears. The corrugated members effectively transfer rotational energy from a shaft to an applicator. In another version, a flexible paste chamber contains polish within a housing of the device. A difference between a rotational speed at a front of the paste chamber and rear of the chamber causes the flexible chamber to contract on itself thereby automatically forcing polish from the chamber and into a polish applicator. A rod extending through a paste chamber includes openings for contents to exit. The rod has one end in contact with a drive disk and a second end in contact with a front disk such that the ends of the rod are maintained substantially in place by the drive disk and front disk, respectively, but remain rotatably independent relative to the drive disk and front disk.