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.
