Manually operated ejector device

US6062857A · kind A · utility

Assignee

• Heraeus Kulzer GmbH & Co. KG · DE

Inventors

• Steffen Oppawsky · Bad Homburg vor der Höhe, DE
• Dieter Schodel · Wiesbaden, DE

Key dates

• Filing date: Mar 11, 1999
• Grant date: May 16, 2000
• Expiry date: Mar 11, 2019

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61C5/62
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A manually operated ejector device for containing a cartridge loaded with viscous material, having a chamber with a front end adapted to contain the cartridge and a back end, a piston disposed in the chamber for engagement in the cartridge, a handle arranged at the back end of the chamber, and a lever displaceable relative to the chamber and the handle for driving the piston in order to drive the latter in its longitudinal direction toward the front end of the chamber. To improve the safety of the handling of the ejector device, the piston has a spring case and a plunger, the spring case having a chamber whose one end is closed and whose other, front end has an opening, the transition between the chamber and the opening being limited by an abutment surface facing the chamber. The plunger furthermore has a cylinder guided through the opening and, on its back end within the chamber, a plunger head which has a greater diameter than the opening, at least in a direction across the longitudinal axis of plunger and spring case. Between the back end of the plunger head facing away from the cylinder there is disposed a spring unit which is compressible in its longitudinal direction parallel…