Medicament Delivery Device

A medicament delivery device comprising:

• a needle for injecting medicament;
• a body having a proximal end and a distal end;
• a needle cover, wherein the needle cover is proximally movable relative to the body between an initial position, in which the needle cover covers the distal end of the needle, and a holding position for dispensing medicament from the device, wherein in the holding position the needle protrudes from the distal end of the needle cover, wherein the needle cover comprises a flexible arm;
• a biasing member configured to bias the needle cover distally;
• and
• a needle cover guide rotatable relative to the body, the needle cover guide comprising a track comprising a first region and a second region, wherein the second region extends at least a first distance partially around a circumference of the needle cover guide for rotating the needle cover guide when the needle cover moves from the initial position to the holding position, wherein the flexible arm engages the track, and wherein the track comprises a radially-extending ramp configured to flex the flexible arm when the needle cover moves from the initial position to the holding position, and wherein the flexible arm is flexed when the needle cover is in the holding position;
• wherein the needle cover is distally movable relative to the body to a locked position, wherein the needle cover covers the distal end of the needle in the locked position, wherein the medicament delivery device comprises a locking surface, and wherein the needle cover engages the locking surface when the needle cover is in the locked position for preventing proximal movement of the needle cover, wherein the locking surface comprises a radially-extending surface extending at least a second distance partially around the circumference of the needle cover guide, wherein the second distance is greater than half of the first distance.

A method of using a medicament delivery device, the method comprising:

• pressing a needle cover of the device against an injection site to move the needle cover towards a holding position, wherein the needle cover comprises a flexible arm which engages a rotatable body of the medicament delivery device, wherein the rotatable body comprises a track, the track comprising a first region and a second region, wherein the first region comprises a radially-extending ramp, wherein the second region extends at least a first distance partially around a circumference of the rotatable body for rotating the rotatable body when the needle cover moves from an initial position to the holding position, and wherein the flexible arm is flexed by the radially-extending ramp when the needle cover is moved towards the holding position;
• and
• applying a holding force to the device to hold the needle cover against the injection site whilst medicament is dispensed from the device, wherein the flexible arm is flexed when the holding force is applied to the device;
• and
• removing the device from the injection site, wherein the needle cover moves to a locked position when the device is removed from the injection site, wherein the medicament delivery device comprises a locking surface, wherein the needle cover engages the locking surface when the needle cover is in the locked position for preventing proximal movement of the needle cover, wherein the locking surface comprises a radially-extending surface extending at least a second distance partially around the circumference of the needle cover guide, wherein the second distance is greater than half of the first distance.