DENTAL SYRINGE

摘要

A dental syringe may include a replaceable valve cartridge containing one or more valves. The valves may include air and water valves using a seating surface and an opposing seating surface with a relative angle formed between the two surfaces. The relative angle allows for regulation of the flow of fluid traveling through the valves. The replaceable valve cartridge may also include a system to remove a residual liquid from a tip of a dental syringe. Additionally, the replaceable valve cartridge may include a seal that prevents bleed-over of fluids within a dental syringe through use of first and second rings of elastic portions of the seal with a low pressure zone defined in between. Further, the dental syringe may include a tip retention insert which may be replaceable and may use either a pair of plates or a plurality of ball bearings to retain the dental syringe tips.

主权项

1. A method of removing residual liquid from a tip of a dental syringe having supplies of a liquid and a second fluid thereto, comprising:
dispensing the liquid from the tip of the dental syringe; and automatically dispensing the second fluid out of the tip of the dental syringe following the dispensing of the liquid, wherein dispensing the second fluid substantially removes residual liquid from the tip of the dental syringe.