Hypodermic anesthetic injection apparatus and method

Details Hypodermic anesthetic injection apparatus and method Hypodermic anesthetic injection apparatus and method

1991-02-08

1993-01-19

Hirsch, Paul J.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 51, 604207, A61M 3100

Patent

active

051803712

ABSTRACT:
An aspirating hypodermic syringe and method for injecting dental anesthetic in which anesthetic flow through the needle is established independently of the fingers of the operator and in which different rates of flow are provided, including positive flow while the needle is entering the tissue. Effective aspiration in syringes which use expendable anesthetic vials is assured by means of a yieldable resistance member in the syringe which holds the vial with sufficient force to enable the syringe plunger to lock positively onto the piston of the vial.

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