Auto-injector

• Main Authors: EKMAN, MATTHEW, KEMP, THOMAS MARK, BRERETON, SIMON FRANCIS, HOURMAND, YANNICK, BURNELL, ROSIE
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2012
• Subjects: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE

The invention refers to an auto-injector (1) for administering a medicament (M), comprising: a chassis (2), a syringe (3) with a hollow needle (4) and a stopper (6) a drive spring (8) capable of, upon activation: advancing the needle (3), injecting the medicament (M), and retracting the syringe (3) with the needle (4) after delivering the medicament (M), activating means (20) arranged to lock and release the drive spring (8), wherein the drive spring (8) is a compression spring arranged to be grounded at a distal end (8.1) in the chassis (2) for advancing the needle (4) and for injecting the dose of medicament (M) via a plunger (9) and wherein the drive spring (8) is arranged to have its ground in the chassis (2) switched to its proximal end (8.2) for retracting the syringe (3). A retraction sleeve (10) is axially movable arranged around the syringe (3), wherein the retraction sleeve (10) is fixable in a maximum proximal position for providing ground at the distal end of the drive spring (8), wherein the retr