초록 ▼

This disclosure is directed to a dental syringe having a barrel and a plunger reciprocally mounted within the barrel which is rendered displaceable so as to extrude a dental root canal through a relatively small bore hyperdermic type needle so as to place the material into the root canals of a tooth

This disclosure is directed to a dental syringe having a barrel and a plunger reciprocally mounted within the barrel which is rendered displaceable so as to extrude a dental root canal through a relatively small bore hyperdermic type needle so as to place the material into the root canals of a tooth during a root canal procedure. In another form of the invention, the dental syringe is modified for use in extruding an impression forming material into the small areas around the gums so as to remove the air prior to the application of the bulk of the impression forming material to complete the impression.

대표청구항 ▼

A dental syringe for the placement of a root canal filling material in a root canal of a tooth and for effecting a controlled extrusion of a predetermined amount of said root canal material comprising: an elongated tubular barrel having an open front and an open rear end, a reservoir fitting means d

A dental syringe for the placement of a root canal filling material in a root canal of a tooth and for effecting a controlled extrusion of a predetermined amount of said root canal material comprising: an elongated tubular barrel having an open front and an open rear end, a reservoir fitting means detachably connected to the front end of said barrel, said reservoir fitting means including a chamber for receiving a supply of root canal material to be extruded, said chamber extending into said barrel, said chamber having a discharge opening extending forward of said barrel, an elongated needle connected to said discharge opening, and having a bore extending therethrough so as to be in communication with said chamber, said needle being sized so as to be received in the root canal of a tooth, a plunger reciprocally mounted in said barrel, said plunger including a stem portion and a connected piston head, said piston head being adapted to be snugly received in said chamber as the plunger is axially displaced within said barrel toward said chamber, said plunger stem extending beyond the rear end of said barrel, a handle means, said handle means including a first handle member fixedly connected to said barrel adjacent the rear end thereof, a second handle member pivotally connected to said fixed handle member, said second handle member being adapted to bear on said plunger to effect the displacement thereof when said second handle member is squeezed toward said first fixed handle member, whereby a mechanical advantage is exerted by said second handle member on said plunger by the application of a nominal squeezing force on said handle member, said plunger stem portion being externally threaded, and an adjustable stop disk threaded on said stem portion, said stop disk being adjustably mounted on said stem portion extending between said handle members whereby said stop disk can be readily adjusted simultaneously with the squeezing of said handle members to effect a controlled extrusion of said root canal material, whereby said stop disk can be variably adjusted along any predetermined length of said threaded portion of said stem to control the amount of extrusion accordingly.