초록 ▼

A manually operated hydraulic syringe includes a syringe barrel having an interior surface. The interior surface bounds a first chamber having a first transverse cross-sectional area and a second chamber having a second transverse cross-sectional area. The first chamber is in fluid communication wit

A manually operated hydraulic syringe includes a syringe barrel having an interior surface. The interior surface bounds a first chamber having a first transverse cross-sectional area and a second chamber having a second transverse cross-sectional area. The first chamber is in fluid communication with the second chamber and the transverse cross-sectional area thereof is smaller than the transverse cross-sectional area of the second chamber. A first plunger has a distal end slidably disposed within the first chamber. A second plunger is slidably enclosed within the second chamber. Sealed in substantial isolation within the syringe barrel between the first and second plungers is a hydraulic fluid, such as water or oil. Rotatably coupled to the distal end of the syringe body is a nozzle or cartridge in which a dispensing material, such as a high viscosity fluid, can be selectively disposed. Manual advancement of the first plunger within the first chamber results in advancement of the second plunger within the second chamber under an increased force. Advancement of the second plunger within the syringe body functions to dispense the dispensing material from the attached nozzle or cartridge.

대표청구항 ▼

1. A dental syringe for controlled delivery of high viscosity dental compositions, such as uncured dental filling material, comprising:(a) a manual plunger comprising (i) a first end on which manual pressure is exerted to push the plunger, and (ii) a second end which defines a first cross sectional

1. A dental syringe for controlled delivery of high viscosity dental compositions, such as uncured dental filling material, comprising:(a) a manual plunger comprising (i) a first end on which manual pressure is exerted to push the plunger, and (ii) a second end which defines a first cross sectional area to which the manual pressure is applied; (b) a hydraulic plunger comprising (i) a first end which defines a second cross sectional area greater than the first, and to which the manual pressure that is applied to the first cross sectional area is hydraulically transferred, and (ii) a second end for applying a hydraulically amplified force to the dental composition for purposes of expressing the dental composition from the barrel; and (c) a barrel with an enclosed interior chamber, and comprising (i) a first end for receiving there through the manual plunger so that the first end of the manual plunger extends beyond the barrel and the second end of the manual plunger is situated within the chamber of the barrel, and (ii) a second end through which the dental composition is delivered; and (d) wherein the hydraulic plunger is situated within the chamber and is hydraulically coupled by a fluid that is completely enclosed within the chamber and that provides a hydraulic coupling between the first and second cross sectional areas so that manual pressure exerted on the first cross sectional area is transferred through the fluid so as to be hydraulically exerted on the second, larger cross sectional area in order to produce an amplified force on the hydraulic plunger when expressing the dental composition from the second end of the barrel.