Abstract: A carpule retentive sleeve with internal stopper retainer for use with an aspirating syringe is disclosed. The carpule retentive sleeve includes a tubular body. At one end of the tubular body is a collar and a stopper retaining sleeve. The tubular body, the collar, and the stopper retaining sleeve are hollow members. Accordingly, a channel runs along the entire length of the carpule retentive sleeve. Further, a method is provided of retrofitting a standard aspirating syringe with the presently disclosed carpule retentive sleeve. Further, a method is provided of using the presently disclosed carpule retentive sleeve to retain a stopper inside the anesthetic carpule.

Abstract: A carpule retentive sleeve with internal stopper retainer for use with an aspirating syringe is disclosed. The carpule retentive sleeve includes a tubular body. At one end of the tubular body is a collar and a stopper retaining sleeve. The tubular body, the collar, and the stopper retaining sleeve are hollow members. Accordingly, a channel runs along the entire length of the carpule retentive sleeve. Further, a method is provided of retrofitting a standard aspirating syringe with the presently disclosed carpule retentive sleeve. Further, a method is provided of using the presently disclosed carpule retentive sleeve to retain a stopper inside the anesthetic carpule.

Abstract: A self-releasing latch for a firearm charging handle is disclosed. The charging handle self-releasing latch includes a roller arm and a roller wheel. The roller arm includes a roller wheel at one end and a protrusion at the other end for engaging a spring. Further, a rocker feature provides a pivot point about midway of the roller arm. The roller wheel of the self-releasing latch engages with a detent or groove under spring force to hold the charging handle in the latched state. Aspects of the charging handle self-releasing latch are that it allows substantially frictionless operation of the charging handle without any manual actuation of levers and/or latches, and that it allows ambidextrous operation of the charging handle of an AR-style weapon platform. Further, a method is provided of retrofitting an existing firearm with the presently disclosed charging handle self-releasing latch.