US 11,701,473 B2
Reusable injection pens
Martin W. Iwanowicz, San Diego, CA (US); and Jack Pryor, Ladera Ranch, CA (US)
Assigned to Medtronic MiniMed, Inc., Northridge, CA (US)
Filed by Medtronic MiniMed, Inc., Northridge, CA (US)
Filed on Jun. 23, 2021, as Appl. No. 17/355,555.
Prior Publication US 2022/0409818 A1, Dec. 29, 2022
Int. Cl. A61M 5/315 (2006.01); A61M 5/20 (2006.01)
CPC A61M 5/31528 (2013.01) [A61M 5/20 (2013.01); A61M 5/31581 (2013.01); A61M 2005/3152 (2013.01); A61M 2005/31588 (2013.01); A61M 2205/50 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A medicine injection pen, comprising:
a body;
a drive member disposed within the body and configured to rotate in a first rotational direction relative to the body from a first position to a second position to dispense liquid medicine, the drive member configured to rotate in a second rotational direction from the second position to the first position to reset the drive member;
a rotary encoder including:
a first part rotationally fixed relative to the body; and
a second part configured to rotate with movement of the drive member to enable determination of an amount of liquid medicine dispensed based on a rotation of the second part relative to the first part; and
a gear set operably coupled to the second part of the rotary encoder, wherein the second part is configured to rotate freely relative to the gear set during movement of the drive member in the first rotational direction and to engage the gear set during movement of the drive member in the second rotational direction.