Patent ID: 8192400
Filing Date: 2012-06-05
Classification: A61C,A61M

Abstract:
1. A pneumatic injection device adapted to be connected with an air outlet of a dental chair for providing a compressed air flow, comprising: an injection unit comprising a unit body having a proximal end, a distal end and a cavity between the proximal and distal ends for receiving a dental cartridge, wherein the distal end has an injection needle connector for connecting a needle, and the proximal end is connected to an air seal adaptor in an airtight relationship; an output pressure selector having an output end connected air-tightly to the other end of the air seal adaptor; an air releasing unit having an output end connected air-tightly to an input end of the output pressure selector, wherein the air releasing unit comprises a primary air inlet passage, a secondary air inlet passage in communication with the primary air inlet passage, an air outlet passage operably in communication with the primary air inlet passage, and an air exhaust passage in communication with the secondary air inlet passage, and wherein a floating valve, a silent mesh, and a spring coil having one end attached to the floating valve and the other end attached to the silent mesh are mounted centrally and axially in the air exhaust passage; and an input pressure adjustor having an output end connected air-tightly to an input end of the air releasing unit, an input end for connection to the air outlet of the dental chair.