Infusion device

A medicament delivery device, comprising:

• a housing;
• a cartridge retainer having a longitudinal axis and located within the housing;
• an operation member that protrudes from the housing and is accessible to a user;
• a needle having a proximal end and having a starting stationary position where the needle is completely within the housing such that the needle is in fluid communication with a medicament container positioned in the cartridge retainer prior to the needle moving relative to and exiting from the housing so that a dose of medicament is delivered through the needle, where the proximal end of the needle moves from the starting stationary position within the housing to a second position that is extended to a position outside the housing and where the movement of the needle from the first position to the second position defines an axis of movement;
• a piston plunger disposed within in the housing, where an end of the piston plunger extends within the medicament container during delivery of the medicament, where the piston plunger moves parallel to the longitudinal axis of the cartridge retainer in a direction that is generally transverse to the axis of movement of the proximal end of the needle;
• and
• an injection speed control mechanism operatively controlling movement of the piston plunger,
• wherein the proximal end of the needle moves to the second position before delivery of the dose of the medicament begins.