Microdosing device
First Claim
1. A volume sensor-free microdosing device comprising:
- 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 communication with the pressure chamber;
an outlet opening which is in fluid communication with the pressure chamber; and
a control means for driving the microdosing device, wherein;
a first change of volume of the pressure chamber volume is effected per unit time by a movement of the displacer 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, thereby causing a fluid volume to be sucked into the pressure chamber; and
in a second phase, a second volume change of the pressure chamber volume, which is greater than said first volume change, is effected per unit time by a movement of the displacer from a second position to the first position, thereby causing a defined fluid volume to be ejected from the outlet.
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Accused Products
Abstract
A volume sensor-free 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 the changed by actuating the displacer, a media reservoir which is in fluid communication with the pressure chamber, an outlet opening which is in fluid communication with the pressure chamber, and a control mechanism. The control mechanism drives the microdosing device in such a way that a small change of volume of the pressure chamber volume is effected per unit time by a movement of the displacer 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, so as to suck a fluid volume into the pressure chamber, and that, in a second phase, a large volume change of the pressure chamber volume is effected per unit time by a movement of the displacer from the second position to the first position, so as to eject a defined fluid volume from the outlet opening in this way.
51 Citations
24 Claims
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1. A volume sensor-free microdosing device comprising:
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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 communication with the pressure chamber;
an outlet opening which is in fluid communication with the pressure chamber; and
a control means for driving the microdosing device, wherein;
a first change of volume of the pressure chamber volume is effected per unit time by a movement of the displacer 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, thereby causing a fluid volume to be sucked into the pressure chamber; and
in a second phase, a second volume change of the pressure chamber volume, which is greater than said first volume change, is effected per unit time by a movement of the displacer from a second position to the first position, thereby causing a defined fluid volume to be ejected from the outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification