Micropump having a constant output
Device for monitoring the operation of a delivery system and the method of use thereof
Pump apparatus for biomedical use
Two valve micropump with improved outlet
Valve equipped with a position detector and a micropump incorporating said valve
Valve and micropump incorporating said valve
Method and apparatus for measuring piston position in a free piston compressor
Micro dispensing positive displacement pump
Micropump Patent #: 5759014
ApplicationNo. 367664 filed on 08/17/1999
US Classes:417/44.1, By control of electric or magnetic drive motor417/212, CONDITION RESPONSIVE CONTROL OF DRIVE TRANSMISSION OR PUMP DISPLACEMENT417/413.2, Piezoelectric driven417/413.3Of semiconductor material (e.g., silicon, germanium, etc.)
ExaminersPrimary: Freay, Charles G.
Assistant: Gray, Michael K.
Attorney, Agent or Firm
Foreign Patent References
International ClassesF04B 049/06
Foreign Application Priority Data1997-02-19 DE
AbstractA microdosing device comprises a pressure chamber which is at least partly delimited by a displacer, an actuating device for actuating the displacer, the volume of the pressure chamber being adapted to be changed by actuating the displacer, a media reservoir which is in fluid comunication with the pressure chamber via a first fluid line, and an outlet opening which is in fluid communication with the pressure chamber via a second fluid line. The microdosing device additionally comprises a means for detecting the respective position of the displacer and a control means which is connected to the actuating device and to the means for detecting the position of the displacer, said control means controlling the actuating device on the basis of the detected position of the displacer or on the basis of displacer positions detected during at least one preceding dosing cycle so as to cause the discharge of a defined volume of fluid from the outlet opening. The control means comprises means for controlling the actuating device with a signal of low edge steepness so as to cause the displacer to move from a first position to a predetermined second position, the second position of the displacer defining a larger volume of the pressure chamber than the first position. In addition, the control means comprises means for controlling the actuating device with a signal of high edge steepness so as to cause the displacer to move from the second position to the first position for discharging in this way a defined volume of fluid from the outlet opening.