DRUG DELIVERY DEVICE AND METHOD FOR DETECTING CONTACT BETWEEN PISTON ROD AND CARTRIDGE BUNG VIA VIBRATION EXCITATION AND MONITORING
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United States of America Patent
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Issued Date -
Jul 30, 2015
app pub date -
Aug 19, 2013
filing date -
Aug 20, 2012
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Abandoned
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Abstract
The present invention is directed to a method for detecting a contact between a drive mechanism and a bung in a drug delivery device. The bung is movably provided in a cartridge and the drive mechanism includes a piston rod and a bearing for driving the bung in a distal direction. The contact is indicated by a change in a vibration behavior, wherein the method includes the steps of inducing vibration excitations into the drug delivery device, displacing the piston rod relative to the bung such that a gap between the bearing and the bung is reduced and monitoring vibration of the drug delivery device. The invention is further directed to drug delivery device produced according to the respective method.
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