Paste injector
The paste injector addresses plunger bending issues by using a plunger with a specific cross-sectional design and reinforcing structure, ensuring smooth and efficient paste extrusion.
WO2026141535A1PCT designated stage Publication Date: 2026-07-02KURARAY NORITAKE DENTAL
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- KURARAY NORITAKE DENTAL
- Filing Date
- 2025-12-25
- Publication Date
- 2026-07-02
AI Technical Summary
Technical Problem
Conventional paste injectors experience plunger bending during extrusion due to the cross-sectional shape and length of the plunger, leading to interference with the syringe and improper paste extrusion.
Method used
The paste injector design includes a plunger with a rod portion composed of strip-shaped plate materials connected at 90° intervals, featuring a tip portion with a smaller cross-sectional area than the storage chamber and an operating portion with a larger cross-sectional area, along with a reinforcing portion to minimize deflection.
Benefits of technology
This configuration effectively suppresses plunger deflection, ensuring proper extrusion of paste by maintaining alignment and preventing interference with the syringe.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure JP2025045491_02072026_PF_FP_ABST
Abstract
In order to provide a paste injector that is capable of suppressing deflection of a plunger when inserting the same into a syringe and capable of appropriately pushing out paste, a paste injector (1) is provided with a plunger (5) that is inserted into a first paste housing chamber through a filling port to push out paste from a discharge port, and the plunger (5) has a first rod part (69) that extends in the longitudinal direction (X). The first rod part (69) has: a plurality of strip-shaped plate members (71) that extend in the longitudinal direction (X), the base edges of which are connected to each other; and a plurality of reinforcing sections (72) that connect adjacent plate members (71) and are formed so as to be continuous between a holder engagement part and an operation part (67). A space (S1) between the inner peripheral surface of the first paste housing chamber (49) and the distal edge (71f) of each of the plate members (71) is smaller than a space (S2) between the inner peripheral surface of the first paste housing chamber (49) and the outer peripheral surface (72e) of each of the reinforcing sections (72).
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