Syringe carpule for storing, transporting and in situ mixing of local anesthetic and buffer, and for delivery of buffered anesthetic solution and a piercing-mixing unit therefore

摘要

A syringe carpule for storing, transporting and in situ mixing of a local anesthetic, such as lidocaine, and a buffer, such as sodium bicarbonate, and delivery of buffered anesthetic solution comprises a hollow tubular body received within the frame of a carpule syringe, at least one axially movable plunger within the body and configured to be engaged and moved by a rod of the carpule syringe, a seal pierced by a rear portion of a needle coupled to the carpule syringe, a first chamber within the body filled with anesthetic solution during storing and transport, a second chamber defined within the body filled with buffering solution during storing and transport; and a breachable separating member between the first and second chamber configured to be removed by a piercing-mixing unit for in situ mixing of the buffering and the anesthetic solutions allowing for delivery of a buffered anesthetic solution.