US 12,268,839 B2
Drive mechanism for infusion pump
Michael Michaud, San Diego, CA (US)
Assigned to Tandem Diabetes Care, Inc, San Diego, CA (US)
Filed by Tandem Diabetes Care, Inc., San Diego, CA (US)
Filed on Sep. 17, 2021, as Appl. No. 17/478,565.
Application 17/478,565 is a continuation of application No. 16/403,016, filed on May 3, 2019, granted, now 11,147,916.
Application 16/403,016 is a continuation of application No. 15/241,257, filed on Aug. 19, 2016, granted, now 10,279,107, issued on May 7, 2019.
Claims priority of provisional application 62/207,748, filed on Aug. 20, 2015.
Prior Publication US 2022/0001104 A1, Jan. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 5/142 (2006.01); A61M 5/145 (2006.01)
CPC A61M 5/1452 (2013.01) [A61M 5/14248 (2013.01); A61M 2005/14268 (2013.01); A61M 2205/103 (2013.01); A61M 2205/3306 (2013.01); A61M 2205/3317 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A user-wearable infusion pump, comprising:
a reservoir configured to include a medicament;
an outlet port in fluid communication with the reservoir;
a plunger disposed within the reservoir;
a pushrod disposed adjacent the plunger;
a threaded lead screw coupled to the pushrod;
a drive tube connected to the threaded lead screw such that rotation of the drive tube causes rotation of the threaded lead screw to linearly advance the lead screw to move the pushrod against the plunger to drive medicament from the reservoir out of the outlet port, wherein the drive tube further includes a plurality of markings on an outer circumferential surface of the drive tube; and
an optical encoder configured to monitor the plurality of markings on the outer circumferential surface of the drive tube to determine rotational positions of the drive tube.