US 12,329,954 B1
Medicament delivery device
Timothy Denyer, Melbourn (GB); James Bradford, Melbourn (GB); Alexander Hee-Hanson, Melbourn (GB); Robert Wilson, Melbourn (GB); Dean Twite, Melbourn (GB); and Thomas Lever, Melbourn (GB)
Assigned to Genzyme Corporation, Cambridge, MA (US)
Filed by Genzyme Corporation, Cambridge, MA (US)
Filed on Aug. 29, 2024, as Appl. No. 18/819,704.
Int. Cl. A61M 5/32 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/3243 (2013.01) [A61M 5/315 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A medicament delivery device comprising:
a housing comprising a proximal end and a distal end;
a needle and a needle cover,
wherein the needle cover is axially movable between an extended position, in which the needle cover extends from the distal end of the housing and covers a distal end of the needle, and a retracted position, in which the needle cover is located in a proximal position relative to the extended position such that the needle protrudes from a distal end of the needle cover;
a needle cover biasing member configured to bias the needle cover axially in a distal direction towards the extended position;
a needle cover retaining mechanism configured to be moved between a first state, in which the needle cover retaining mechanism is disengaged from the needle cover such that the needle cover is moveable in the distal direction under a force of the needle cover biasing member, and a second state, in which the needle cover retaining mechanism is configured to engage the needle cover and prevent distal movement of the needle cover under the force of the needle cover biasing member, when the needle cover is in the retracted position, wherein the needle cover retaining mechanism comprises a retaining member; and
a drive mechanism comprising a plunger rod, wherein the plunger rod is configured to cause the retaining member to (i) be moved from the first state into the second state and (ii) be rotationally coupled to the plunger rod upon distal movement of the plunger rod.
 
20. A method of temporarily removing a holding force required to operate a medicament delivery device, the method comprising:
moving a needle cover from an extended position, in which the needle cover extends from a distal end of a housing and covers a distal end of a needle, to a retracted position, in which the needle protrudes from a distal end of the needle cover, against a force of a needle cover biasing member;
moving a plunger rod of the medicament delivery device distally to (i) cause a retaining member of a retaining mechanism to rotate from a first state, in which the retaining member is disengaged from the needle cover, to a second state, in which the retaining member engages the needle cover and prevents distal movement of the needle cover under the force of the needle cover biasing member, such that a user is no longer required to counteract the force of the needle cover biasing member and to (ii) cause the retaining member to be rotationally coupled to the plunger rod;
rotating the retaining member from the second state back to the first state to reapply the force of the needle cover biasing member; and
moving the needle cover from the retracted position to the extended position.