US 12,403,246 B2
Piercing device for an administration device
Ursina Streit, Schönbühl (CH); Patrick Hostettler, Hasle (CH); Christophe Hofer, Burgdorf (CH); and Roland Margot, Worb (CH)
Assigned to TecMed AG, Burgdorf (CH)
Filed by TecMed AG, Burgdorf (CH)
Filed on Apr. 9, 2021, as Appl. No. 17/227,081.
Application 17/227,081 is a continuation of application No. PCT/IB2019/058017, filed on Sep. 23, 2019.
Claims priority of application No. 18199475 (EP), filed on Oct. 10, 2018.
Prior Publication US 2021/0228799 A1, Jul. 29, 2021
Int. Cl. A61M 5/142 (2006.01)
CPC A61M 5/14248 (2013.01) [A61M 2005/14252 (2013.01); A61M 2005/14268 (2013.01); A61M 2205/3673 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A piercing device for an administration device, the piercing device comprising:
a biased elastic element applying a biasing force for generating a piercing movement;
a base;
a cannula unit movable relative to the base from a secured position in a piercing direction, wherein the cannula unit is biased in the piercing direction by the biasing force of the biased elastic element;
a securing element configured to hold the biased cannula unit in the secured position, wherein the securing element comprises a thermosensitive area configured to be deformable when heated under mechanical tension;
a retaining element configured as a rotatable lever, wherein in the secured position the retaining element is adapted to transfer the biasing force to the securing element; and
a heating element,
wherein the securing element is arranged in a stack between a surface of the base and an underside of the heating element, and wherein the heating element is configured to heat the thermosensitive area of the securing element such that the thermosensitive area can deform due to the biasing force,
wherein upon deformation of the securing element, the biasing force of the elastic element causes a movement of the cannula unit away from the secured position in the piercing direction, and
wherein during the movement of the cannula unit, the cannula unit causes the retaining element to rotate such that the piercing movement is triggered.