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US 4,531,913 AGranted
Dental syringe
AssigneeTakara Nakajima Co., Ltd.
InventorMitsukuni Taguchi
Life of this patent
Estimating the term…
Abstract
In a dental syringe, compressed air is caused to flow through a passage tube provided in the body of the syringe while whirling, thus resulting in a whirling air flow which is in turn caused to flow toward a nozzle and, in the course of the flowing movement, is heated due to friction between the air flow and the inner wall of the passage tube.
Claims18
A dental syringe, comprising:
- a syringe body provided therein with an air feed passage coupled to a compressed air source through an air feed tube, and a water feed passage coupled to a warm water source through a water feed tube;
- means for generating a whirling air flow by being supplied with compressed air through said air feed passage;
- a nozzle portion provided therein with a whirling air flow transmission passage for permitting the whirling air flow generated by said whirling air flow generating means to be transmitted therethrough toward the fore end of said syringe, and a warm water passage disposed in communication with said water feed passage, said nozzle portion being attached at the base end portion thereof to the fore end portion of said syringe body through said whirling air flow generating means;
- an air jet port provided at the front end of said nozzle portion for permitting the outer portion of said whirling air flow transmitted through said whirling air flow transmission passage to be jetted to the outside;
- a water jet port provided at the front end of said nozzle portion for permitting warm water introduced from said warm water passage to be jetted to the outside;
- and
- a cylindrical shank portion mounted at the rear end of said syringe body.
4 more elements
Dependencies are inferred from the claim text.