Syringe apparatus with threaded plunger for delivering tooth com

Details Syringe apparatus with threaded plunger for delivering tooth com Syringe apparatus with threaded plunger for delivering tooth com

1996-05-15

1997-04-08

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604218, 222390, A61M 500

Patent

active

056182732

ABSTRACT:
A syringe apparatus is disclosed for delivering solid, yet pliable materials, such as dental composites. The syringe apparatus of the present invention comprises an unthreaded barrel means for containing the material. The unthreaded barrel means has an inlet end, an outlet end, and an enlarged finger grip at the inlet end. The syringe apparatus also comprises means for slidably engaging the finger grip of the barrel means, the engaging means having a threaded throughbore. The syringe apparatus further comprises a plunger means for movement through the barrel means. The plunger means has a threaded portion that is complementary to the threaded throughbore of the engaging means, such that the plunger means may be advanced into the barrel means at the inlet end by applying an external rotational force to the plunger means relative to the barrel means, thereby effecting delivery of the material at the outlet end of the barrel means. Finally, the threaded throughbore of the engaging means and the threaded portion of the plunger means are configured such that the plunger means will automatically withdraw slightly from the barrel means when the external rotational force is removed from the plunger means, reducing the amount of pressure exerted by the plunger means on the material within the barrel means.

REFERENCES:
patent: 4189065 (1980-02-01), Herold
patent: 4312343 (1982-01-01), LeVeen et al.
patent: 4710179 (1987-12-01), Haber et al.
patent: 5318544 (1994-06-01), Drypen et al.

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