Device for injecting a fluid into a receptacle

US5238031A · kind A · utility

Assignee

• Deutsche Forschungsanstalt Fur Luft-Und Raumfahrt E.V. · DE

Inventors

• Klaus Baeumer · Kreuztal, DE
• Juergen Neubert · Stuttgart, DE

Key dates

• Filing date: Feb 11, 1992
• Grant date: Aug 24, 1993
• Expiry date: Feb 11, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2035/00336
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A receptacle includes a receiving chamber into which an injection fluid is to be injected. An injection unit includes a syringe having a needle adapted to pierce a diaphragm of the receptacle. The injection unit has a second needle [(28)] that may be advanced through a further diaphragm into a return chamber of the receptacle. The second needle is secured to a sliding pipe coupled to the syringe via a coupling means. Both needles are advanced simultaneously into the receptacle. Then, the syringe is ejected by moving the syringe plunger. The liquid volume displaced from the return chamber reaches the rear barrel chamber via the sliding pipe, the volume of the rear barrel chamber increasing by the amount in which the injection fluid has been ejected, subtracting the volume of the plunger rod. The exchange of liquid is supported by the suction effect of the partial vacuum generated by the lowering of the syringe plunger. The fluid of the injection device is sealed tight against the environment. The device is particularly suitable for use under zero gravity conditions, e.g. in space.