DUAL MEDICAMENT CARPULE FOR DENTAL SYRINGES

摘要

A carpule for a dental syringe provides an internal piston disposed between a front septum and a rear plunger. The internal piston is hollow and includes a thin membrane front. The internal piston is designed to offer minimum resistance to movement in the carpule body to allow for aspiration and for easy dispensing. The internal piston divides the carpule into two anesthetic chambers, allowing an anesthetic without a vasoconstrictor and an anesthetic with a vasoconstrictor to be dispensed sequentially in a single injection and without causing undue trauma to the patient.

主权项

1. A dental carpule system comprising:
a tubular carpule body having a cylindrical bore along a length thereof, the carpule having a reduced diameter neck and a ridge formed on a distal end thereof and an hole formed through the neck in alignment with the bore and connecting the bore to a distal face of the carpule body; a septum attached to the distal end of the carpule body to close the distal end of the carpule body; a plunger disposed in a proximal end of the bore such that the plunger seals against the bore to close the proximal end of the bore; a piston disposed in the bore between the septum and the plunger such that the piston divides the bore into a first anesthetic chamber and a second anesthetic chamber; wherein the piston comprises a generally cylindrical piston body having a hole therethrough, the hole being disposed in alignment with the bore of the carpule body; wherein the piston comprises a membrane attached to a distal face of the piston body to close the hole through the piston body; a first anesthetic without a vasoconstrictor disposed in the first anesthetic chamber; and a second anesthetic with a vasoconstrictor disposed in the second anesthetic chamber.