Method and apparatus for controlling the injection rate of a...

A - Human Necessities – 61 – M

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A61M 5/24 (2006.01) A61C 19/08 (2006.01) A61M 5/20 (2006.01)

Patent

CA 2597515

Disclosed are a method and apparatus for controlling the injection rate of an anesthetic solution in a cartridge type motor driven injection syringe for dental use, particularly beginning with the "Low" rate injection at the outset, and switching to the "Medium" or "High" injection rate at an arbitrarily selected time in the course of injection. The speed of revolution of the electric motor is changed among the low, medium and high speed, and a two-step operable type of switch is used as a starter switch 13. The first depression of the starter switch makes the electric motor 9 start at the low speed, thereby making the plunger rubber 5 initially move at the "Low Speed" in the cartridge 6 via the plunger rod 12, and the second depression of the switch makes the electric motor 9 run at the low, medium or high speed, and accordingly the plunger rod moves at the selected "Low Speed", "Medium Speed" or "High Speed".

L'invention concerne un procédé de contrôle de vitesse d'injection de liquide anesthésiant et un dispositif pour seringue électrique de type cartouche pour application dentaire, avec lesquels l'injection initiale d'un liquide anesthésiant commence à la "vitesse lente," et à un moment désiré de l'injection, la vitesse de l'injection peut passer de "vitesse lente" à "vitesse moyenne" ou "vitesse rapide." La vitesse de rotation d'un moteur est adaptée pour commuter entre trois niveaux, à savoir lent, moyen et rapide, et un interrupteur pour lancer le moteur est un interrupteur à pression en deux temps (13). Pour déplacer initialement une tige de piston (12) afin de comprimer le caoutchouc de piston (5) d'une cartouche (6) à la "vitesse lente," on enfonce l'interrupteur dans la première position pour faire tourner un moteur (9) à une vitesse lente. Ensuite, pour amener la tige de piston à l'une quelconque des "vitesse lente," "vitesse moyenne" et "vitesse rapide," on enfonce l'interrupteur dans la deuxième position pour faire tourner le moteur à l'une des vitesses sélectionnées précédemment parmi vitesse lente, vitesse moyenne et vitesse rapide.

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