CPC A61M 5/20 (2013.01) [A61M 5/1452 (2013.01); A61M 5/3146 (2013.01); G01D 5/32 (2013.01); G01D 5/34 (2013.01); G01S 17/08 (2013.01); A61M 5/31515 (2013.01); A61M 2005/206 (2013.01); A61M 2205/3306 (2013.01); A61M 2205/587 (2013.01)] | 31 Claims |
1. A medical device comprising:
a bung having a proximal face comprising one or more protrusions; and
a proximity sensor located within or on a plunger at a distal end of the plunger adjacent to the bung, the proximity sensor configured to move with the plunger as the plunger moves towards the bung, and the proximity sensor aligned to receive light reflected by the one or more protrusions of the bung,
wherein the received reflected light is used to detect a position of the plunger relative to the bung in a drug cartridge of the medical device.
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