Dosing syringe

• US 4,852,768 A
• Filed: 03/22/1988
• Issued: 08/01/1989
• Est. Priority Date: 03/25/1987
• Status: Expired due to Fees

• Current Assignee: Blendax-Werke R Schnieder GmbH & Company
• Original Assignee: Blendax-Werke R Schnieder GmbH & Company
• Inventors: Bartsch, Klaus
• Primary Examiner(s): Rolla, Joseph J.
• Assistant Examiner(s): Parker, Stephen B.
• Application Number:
  US07/171,662
• Time in Patent Office: 497 Days
• Field of Search: 222/386, 222/390, 222/39, 222/23, 222/41, 222/47, 222/46, 604/207, 604/211, 604/218, 604/220, 604/222, 604/224, 604/228
• US Class Current: 222/46
• CPC Class Codes: A61M 5/315 Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
• CPC Class Codes: A61M 5/31581 performed by rotationally moving or pivoting actuator operated by user, e.g. an injection lever or handle
• CPC Class Codes: G01F 11/027 of the syringe type

Abstract

A dosing syringe has a cylindrical syringe body which at its tapering end has a dispensing orifice and at its other end a stepped cylindrical enlargement with two opposing handles. A recess is located below each handle, and a piston is inserted into the cylindrical syringe body. The piston is in contact with a dosing plunger having an external thread. Two threaded sides are arranged around the plunger and each threaded side has a positioning projection introduced into the recesses of the enlargement. According to the invention, the piston is connected to the dosing plunger by a spring retainer connection and the threaded sides have an outside groove in which an O-ring is inserted in countersunk fashion to hold the two threaded sides together. As a result, the piston-dosing unit can be prefabricated and introduced as a complete unit including the threaded sides into the enlargement of the syringe body where it is fixed simplifying the production technology of the dosing syringe.

Claims

1. A dosing syringe comprising a cylindrical syringe body having a tapering end with a dispensing orifice therein, a stepped cylindrical enlargement, two opposing handles connected to and extending from the cylindrical enlargement, two opposing recesses in the cylindrical enlargement one underneath each handle, a piston inserted into the cylindrical syringe body from the enlarged end thereof, two retainer sides each having an internal thread, and a dosing plunger having an external thread, the dosing plunger being rotatably arranged in the two-part retainer sides with the threads engaging one another and the two retainer sides positioned in the enlargement of the syringe body, each retainer side having a positioning projection fitted into the recesses in the enlargement, a spring retainer connection releasably connecting the piston to the dosing plunger, each of the retainer sides having an outside groove, and an O-ring in the groove holding the two retainer sides together, and wherein the retainer sides are slightly spaced apart forming a pair of gaps 180°

from each other, and a longitudinal rib on the plunger constructed and arranged to fit into one of the gaps and to be movable to the other gap upon 180°

rotation of the dosing plunger.