Discharging device for liquids

Abstract

A discharging device for pharmaceutical liquids having an actuator for carrying out a discharging operation of a pharmaceutical liquid. A first subordinate unit of the actuator has a discharge orifice, and a second subordinate unit is displaceable relative to the first subordinate unit for carrying out the discharging operation. The two subordinate units together delimit a buffer chamber from which a liquid passageway leads to the discharge orifice. A liquid-containing bag is accommodated in the buffer chamber and has film-like walls. The actuator and the bag are coordinated such that displacement of the subordinate units of the actuator relative to each other causes opening of the bag and reduction in the volume of the buffer chamber with consequent volume reduction of the liquid-containing bag and discharge of liquid through the discharge orifice.

Description

FIELD OF APPLICATION AND PRIOR ART[0001]This application claims the priority of the German patent application No. 10 2010 013 543.7. The whole disclosure of this prior application is herewith incorporated by reference into this application.[0002]The invention relates to a discharging device for pharmaceutical liquids, which discharging device comprises an actuator for manually carrying out a discharging operation and a liquid storage receptical, in which the pharmaceutical liquid is stored prior to the discharging operation. A first subordinate unit of the actuator is provided with a discharge orifice, and a second subordinate unit of the actuator is displaceable relatively to the first subordinate unit for carrying out the discharging operation.[0003]Such a discharging device is disclosed, for example, in DE 44 12 041 A1. This generic discharging device is intended for one-time use. It comprises two subunits which can be displaced relatively to each other and each of which comprise...

AI Technical Summary

Benefits of technology

[0005]It is an object of the invention to develop a generic discharging device that can be produced cheaply with a high degree of reliability.

[0006]According to the invention, this object is achieved in that the two subordinate units of the actuator jointly delimit a buffer chamber, from which a liquid passageway leads to the discharge orifice. This buffer chamber serves to accommodate a liquid storage receptical that is in the form of a liquid-containing bag. The walls of this liquid-containing bag are in the form of film walls and they delimit the interior space thereof filled with the liquid. The actuator and the liquid-containing bag are coordinated to each other in such a way that displacement of the subordinate units of the actuator relatively to each other causes the liquid-containing bag to open and the volume of the buffer chamber to decrease and consequently the volume of the liquid-containing bag to be reduced, as a result of which the liquid is discharged through the discharge orifice.

Problems solved by technology

However, their disadvantage resides in the comparatively high outlay required, this being mainly due to the use of the glass cylinder and the rubber stopper.

As a result of this comparatively high cost factor, generic discharging devices of the type described above have primarily been used hitherto only for comparatively high-priced medicines.

By contrast, the use of a self-supporting rigid film that is converted to a three-dimensional object by means of a thermoforming / deep-drawing process may be regarded as being unfavorable.

Images