Ejection apparatus for the high pressure ejection of a liquid

US5840061A · kind A · utility

Assignee

• Ferton Holding · CH

Inventors

• Andreas Menne · Meersburg, DE
• Wolfgang Merkle · Meersburg, DE
• Manfred Schulz · Jeffery Road, DE
• Denis Klopfenstein · Morges, CH

Key dates

• Filing date: Jan 15, 1997
• Grant date: Nov 24, 1998
• Expiry date: Jan 15, 2017

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M5/3007
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An ejection apparatus for the high pressure ejection of a liquid. The apparatus has the following elements: (a) a pressure chamber for containing the liquid; (b) an ejection opening communicating between an outside and an inside of the pressure chamber; (c) a working piston displaceable in the pressure chamber from a first position at a beginning of a working stroke to second position at an end of the working stroke, having (1) a first end defining a first volume within the pressure chamber when the working piston is at the first position and displacing a second volume, less than the first volume, when the working piston moves from the first position to the second position, and (2) having a second end distal from the first end; and (d) a drive for driving the working piston including (1) an impact member for elastically impacting the second end of the working piston to cause the working piston from the first to the second position and (2) means for accelerating the impact member to impact the working piston. The device can be constructed either as an endoscopic device for delivering liquids in minimally invasive surgical procedures, or as a needle-less inoculation device.