Method and device for painless injection of medication

A self-contained device for injecting painlessly and intra-muscularly a liquid medicament, comprising:

• a) a housing that includes a means for semi-permanent attachment of the device to the skin of a patient,
• b) an injection needle disposed substantially perpendicular to the base and within the housing, the needle having an injection end, and configured for movement between a first position wherein the injection end is within the housing and a second position wherein the injection end extends outwardly from the base to a distance sufficient for intramuscular insertion thereof, the injection needle having an outside diameter greater than 0.20 mm and less than about 0.38 mm,
• c) a reservoir containing a liquid medicament,
• d) a means for liquid communication between the reservoir and the injection needle,
• e) a means for pre-selecting the depth of extension of the injection end of the needle at its second position,
• f) a means for inserting the injection end to its second position, and
• g) a means for injecting the medicament from the reservoir to the injection end of the needle.

A self-contained device for injecting a medicament, comprising:

• a) a housing that includes a means for semi-permanent attachment of the device to the skin of a patient,
• b) an injection needle disposed within the housing and having an injection end configured for insertion into the skin of the patient,
• c) a reservoir containing a liquid medicament and configured for liquid communication with the injection needle, and
• d) a bandage releasably affixed to the base of the housing, comprising a base-contacting surface and a skin-contacting surface that comprises an affixment for attachment of the device to the skin.