Dental Cartridge Piston Insertion via Carrier Mediator
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Solution Overview
Problem
Conventional cartridges face difficulties in inserting a piston after filling a paste-type dental material due to the piston's small size, requiring manual handling which complicates the process.
Innovation Solution
A cartridge design with a flange portion and annular tapered surfaces facilitates piston insertion by allowing the piston to be pressed-fit without manual handling, using a cylindrical syringe and plunger with specific radial and thickness ratios to stabilize the piston during insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the piston is made smaller to fit the cartridge, then the cartridge size is reduced, but the piston becomes difficult to handle manually
Solution Approach 1:
The patent introduces a carrier as an intermediary device that holds the piston before insertion. The carrier has dimensions larger than the piston, making it easy to handle, while the piston can be transferred from the carrier to the cartridge opening. This resolves the contradiction by providing a mediator that bridges the gap between small piston size and ease of handling.
Solution Approach 2:
The system is divided into separate components: the piston, the carrier, and the cartridge. The piston remains small for fitting purposes, while the carrier provides the handling interface. This segmentation allows each component to be optimized independently - the piston for size and the carrier for ease of operation.
2Volume of moving object
If the piston is made smaller to fit the cartridge, then the cartridge size is reduced, but the piston may fall over during insertion
Solution Approach 1:
The carrier acts as a stable intermediary that holds the small piston in a fixed position during handling and insertion. The carrier's larger size and structural stability prevent the piston from falling over, while still allowing the small piston to fit into the cartridge opening.
Solution Approach 2:
The piston is pre-positioned in the carrier before insertion into the cartridge. This preliminary positioning ensures the piston is stable and correctly oriented before the actual insertion process begins, preventing it from falling over during handling.
3Manufacturing precision
If manual handling of the piston is required, then insertion precision may be improved, but the process becomes more complex
Solution Approach 1:
The carrier serves as a simple intermediary device that maintains piston positioning without requiring complex manual handling procedures. The carrier's design provides inherent alignment and positioning features that ensure precision while keeping the overall process simple and straightforward.
Data Source
Figure 1A~1F
Figure 2A~2D
Figure 3A~3D
AI summary
Provided herein are a method of filling a paste-type dental material into a cartridge which facilitates inserting a piston after a paste-type dental material is filled into the cartridge and a cartridge suitable to implement the method. A paste-type dental material is filled from an opening portion 32 of a cartridge 3 into a cylindrical portion 33 by moving the opening portion 32 of the cylindrical portion 33 of the cartridge 3 along a kneading surface OS, on which the paste-type dental material is kneaded, with the opening portion 32 being inclined. The piston 4 is placed on the kneading surface OS with a circular end surface 42 of the piston 4 contacting the kneading surface OS. The piston 4 is inserted into the cylindrical portion 33 by moving the opening portion 32 of the cylindrical portion 33 of the cartridge 3 closer to the piston 4 located on the kneading surface OS such that a piston-side tapered surface 43 or the piston-side curved surface 43 of the piston 4 is fitted into the opening portion 32, and thereafter moving the one 31 of the two ends of the cylindrical portion 33 toward the kneading surface OS.