US 11,654,244 B2
Injection unit for administering or delivering a fluid product
Juerg Hirschel, Bern (CH); Ulrich Moser, Heimiswil (CH); and Stefan Burren, Schwarzenburg (CH)
Assigned to Ypsomed AG, Burgdorf (CH)
Filed by Ypsomed AG, Burgdorf (CH)
Filed on Dec. 17, 2021, as Appl. No. 17/554,317.
Application 17/554,317 is a continuation of application No. 16/378,885, filed on Apr. 9, 2019, granted, now 11,224,697.
Application 16/378,885 is a continuation of application No. 15/809,633, filed on Nov. 10, 2017, granted, now 10,471,215, issued on Nov. 12, 2019.
Application 15/809,633 is a continuation of application No. 14/454,572, filed on Aug. 7, 2014, granted, now 9,821,121, issued on Nov. 21, 2017.
Application 14/454,572 is a continuation of application No. PCT/CH2013/000021, filed on Feb. 5, 2013.
Claims priority of application No. CH 177/12 (CH), filed on Feb. 9, 2012.
Prior Publication US 2022/0105274 A1, Apr. 7, 2022
Int. Cl. A61M 25/00 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/3156 (2013.01) [A61M 5/31551 (2013.01); A61M 5/31585 (2013.01); A61M 5/31535 (2013.01); A61M 2005/3154 (2013.01); A61M 2205/581 (2013.01); A61M 2205/582 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An injection device for administering or conveying fluid product, comprising:
a housing comprising a receptacle for the product, the housing extending along an axis of the injection device;
a delivery apparatus comprising a piston rod and a guide element, wherein the piston rod is axially movable relative to the housing in a delivery direction for discharging a set product dose in a delivery stroke that corresponds to the set product dose, wherein the guide element guides a translational movement of the piston rod and a drive element engaged with the piston rod;
a dosing device for setting and correcting a product dose to be administered, the dosing device comprising a dosing sleeve and a rotary knob;
a discharge button arranged coaxially on the dosing sleeve; and
a coupling mechanism, wherein the dosing device is coupled to the delivery apparatus by the coupling mechanism, the coupling mechanism comprising at least two coupling surfaces each comprising a tooth arrangement comprising teeth, the at least two coupling surfaces engageable by a spring, wherein the at least two coupling surfaces are movable relative to each other during a dosing operation or during a dose correction such that an acoustic and/or tactile signal is produced corresponding to the set product dose or to a corrected dose of the product, and wherein a relative movement between the at least two coupling surfaces is prevented by triggering the discharge button,
wherein the coupling mechanism comprises a coupling member arranged non-rotatably and axially displaceably at the drive element, and wherein one of the at least two coupling surfaces is fixedly arranged on the coupling member, and another of the at least two coupling surfaces is fixedly arranged at the dosing sleeve such that the coupling surface of the coupling member and the coupling surface of the dosing sleeve can be directly or indirectly brought into a coupling engagement.