US 12,420,010 B2
Needle insertion and retraction mechanism
Simon Scheurer, Bern (CH); Christian Schrul, Burgdorf (CH); Stefan Burren, Schwarzenburg (CH); Mario Bernhard, Burgdorf (CH); and Jürg Hirschel, Bern (CH)
Assigned to Ypsomed AG, Burgdorf (CH)
Filed by Ypsomed AG, Burgdorf (CH)
Filed on Jan. 14, 2021, as Appl. No. 17/149,347.
Application 17/149,347 is a continuation of application No. PCT/IB2019/055544, filed on Jul. 1, 2019.
Claims priority of application No. 18186224 (EP), filed on Jul. 30, 2018.
Prior Publication US 2021/0138151 A1, May 13, 2021
Int. Cl. A61M 5/158 (2006.01); A61M 5/142 (2006.01)
CPC A61M 5/158 (2013.01) [A61M 5/14248 (2013.01); A61M 2005/1583 (2013.01); A61M 2005/1585 (2013.01); A61M 2205/581 (2013.01); A61M 2205/583 (2013.01); A61M 2205/587 (2013.01); A61M 2205/8206 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A needle insertion and retraction mechanism for a medication delivery device for delivering a medicament, comprises:
a housing;
a needle carrier holding a needle, the needle carrier configured to be linearly guided by the housing along a longitudinal axis of the needle in a needle insertion direction and a needle retraction direction, which is opposite to the needle insertion direction;
a first spring member configured to move the needle carrier with respect to the housing in the needle insertion direction;
a second spring member, the second spring member being pre-loaded with stored energy sufficient to retract the needle carrier with respect to the housing in the needle retraction direction; and
a control element configured to be linearly guided by the housing and moved transversely with respect to the longitudinal axis of the needle from a starting position, via a needle insertion release position, to a needle retraction release position,
wherein:
when the control element is in the starting position, the control element is operatively coupled to the needle carrier to prevent the needle carrier from being moved in the needle insertion direction,
when the control element is in the needle insertion release position, the control element is decoupled from the needle carrier such that the first spring member drives the needle carrier in the needle insertion direction into a needle insertion position, while the second spring member is operatively coupled to the housing to keep the second spring member pre-loaded, and
when the control element moves from the needle insertion release position to the needle retraction release position, the control element causes the second spring member to be decoupled from the housing such that the stored energy is released and the pre-loaded second spring member drives the needle carrier in the needle retraction direction.