Auto-injector

• US 20040039336A1
• Filed: 06/13/2003
• Published: 02/26/2004
• Est. Priority Date: 12/14/2000
• Status: Active Grant

• Current Assignee: Shl Medical AG
• Original Assignee: SHL Group AB
• Inventors: Amark, Mikael, Bergens, Thomas
• Granted Patent: US 7,442,185 B2
• Time in Patent Office: Days
• US Class Current: 604/136
• CPC Class Codes: A61M 2005/206 With automatic needle insertion
• CPC Class Codes: A61M 2005/208 Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin
• CPC Class Codes: A61M 5/2033 Spring-loaded one-shot injectors with or without automatic needle insertion multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287

Abstract

A device for auto-injection of a dose of medicament, comprises a housing arranged to contain a medicament container therein and a contact part intended to be applied against an injection site, a needle cover surrounding a needle arranged to the medicament container and extending at least the length of the needle, spring elements for, upon activation, pushing the needle past the end of the cover as well as operating the medicament container to supply the dose of medicament, first locking elements for locking the spring elements in a pressurized state, first activating elements for, upon manual operation, releasing the spring elements for injection. There is a second locking element capable of locking the first activating element and a second activating element, capable of releasing the second locking element when the contact part is exposed to pressure.

Claims

1. Device for auto-injection of a dose of medicament, comprising a housing (10) arranged to contain a medicament container (24) therein and comprising a contact part (18, 20) intended to be applied against an injection site, a needle cover (18, 20) surrounding a needle arranged to the medicament container and extending at least the length of the needle, spring means (76, 82) capable of, upon activation, pushing the needle past the end (20) of the needle cover as well as operating said medicament container to supply the dose of medicament, first locking means (46, 58, 62, 78) capable of locking said spring means in a pressurised state, first activating means (54, 58) capable of, upon manual operation, releasing said spring means for injection, characterised by a second locking means (56, 68, 70) capable of locking said first activating means and a second activating means (16, 18, 46), capable of releasing said second locking means when said contact part is exposed to pressure.

2. Device according to claim 1, characterised in that said contact part constitutes the front end of said needle cover.

3. Device according to any of the preceding claims, characterised in that said needle cover completely encloses said needle and in that said needle is sterile.

6. Device according to any of the preceding claims, characterised in holding means capable of retardation of the movement of the drug container.

4. Device for auto-injection of a dose of medicament, comprising a housing (10) arranged to contain a medicament container (24) therein and comprising a contact part (18, 20) intended to be applied against an injection site, a needle cover (18, 20) surrounding a needle arranged to the medicament container and extending at least the length of the needle, spring means (76, 82) capable of, upon activation, pushing the needle past the end (20) of the needle cover as well as operating said medicament container to supply the dose of medicament, first locking means (46, 58, 62, 78) capable of locking said spring means in a pressurised state, first activating means (54, 58) capable of, upon manual operation, releasing said spring means for injection, characterised in a second spring means (74) capable of pushing said needle cover over said needle after injection, third locking means (32, 47) capable of locking said second spring means in a pressurised state during injection, and a third activating means (76, 80) capable of releasing said second spring means upon end of injection.

5. Device according to claim 4, characterised in a fourth locking means (11, 42) capable of locking said needle cover in a covering position after injection.