US 12,377,217 B2
Injection device with a spring for a needle protecting sleeve
Edgar Hommann, Grossaffoltern (CH); Benjamin Scherer, Uster (CH); and Ian M. Thompson, Burgdorf (CH)
Assigned to Ypsomed AG, Burgdorf (CH)
Filed by Ypsomed AG, Burgdorf (CH)
Filed on Jun. 9, 2020, as Appl. No. 16/896,831.
Application 16/896,831 is a continuation of application No. 14/862,275, filed on Sep. 23, 2015, granted, now 10,709,840.
Application 14/862,275 is a continuation of application No. 12/644,304, filed on Dec. 22, 2009, granted, now 9,155,836, issued on Oct. 13, 2015.
Application 12/644,304 is a continuation of application No. PCT/CH2008/000288, filed on Jun. 26, 2008.
Claims priority of application No. 10 2007 030 327.2 (DE), filed on Jun. 29, 2007.
Prior Publication US 2020/0297930 A1, Sep. 24, 2020
Int. Cl. A61M 5/20 (2006.01); A61M 5/24 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/2033 (2013.01) [A61M 2005/2013 (2013.01); A61M 2005/206 (2013.01); A61M 2005/208 (2013.01); A61M 5/24 (2013.01); A61M 2005/3247 (2013.01); A61M 5/326 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An injection device comprising:
a) a housing enclosing a product container;
b) a needle protecting sleeve comprising a locking cam, wherein distal movement of the locking cam beyond a locking tongue of the injection device causes the locking tongue to spring radially to block the needle protecting sleeve in an end position against moving in a proximal direction;
c) a piston rod acting on a piston to shift the piston relative to the product container;
d) a delivery spring acting on the piston rod, wherein the piston rod is at least partially hollow and sleeve-shaped and encloses the delivery spring in a biased state of the delivery spring;
e) a restoring spring for shifting the needle protecting sleeve distally from a proximal position to the end position; and
f) a releasing member with a protrusion mounted on a distal end of an elastic arm and directed radially inward to engage an outer surface of the piston rod in an engagement to prevent the piston rod from moving in a distal direction, wherein the releasing member is prevented from disengaging from the engagement with the piston rod by a radially inward directed surface of a supporting element contacting the releasing member to prevent the releasing member from moving radially outward,
wherein at an end of a needle insertion process, by shifting the supporting element relative to the housing, the releasing member can unlatch, radially outwardly, from the engagement with the piston rod to release the piston rod for movement in the distal direction.