Syringe for the controlled discharge of viscous materials

US5620423A · kind A · utility

Assignee

• HERAEUS KULZER GMBH · DE

Inventors

• Rudolf Eykmann · Usingen, DE
• Joachim Fritze · Friedrichsdorf, DE
• Birgit Uhrig · Neu-Anspach, DE
• Dieter Schodel · Wiesbaden, DE

Key dates

• Filing date: Sep 23, 1994
• Grant date: Apr 15, 1997
• Expiry date: Sep 23, 2014

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2005/31521
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A syringe having a stopper configured at least partly as a membrane surface. The stopper is prestressed opposite to the direction of insertion of a rotary piston so that it assumes a stable position at rest. After displacement by the rotary piston, the membrane surface reversibly returns to this stable position after it is depressurized.