Injector

• US 7,955,304 B2
• Filed: 07/15/2005
• Issued: 06/07/2011
• Est. Priority Date: 07/15/2005
• Status: Active Grant

• Current Assignee: Shl Medical AG
• Original Assignee: SHL Group AB
• Inventors: Guillermo, Carlos
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): Bouchelle; Laura A
• Application Number:
  US11/182,060
• Publication Number:
  US 20070021720A1
• Time in Patent Office: 2,153 Days
• Field of Search: 604/165.02, 604/208, 604134-137
• US Class Current: 604/137
• 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
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user

Abstract

The present invention relates to a method of operating an injection device, which device comprises a medicament cartridge and a needle attached to said cartridge, means for automatic penetration of needle, injection of medicament and withdrawal of needle, comprising the steps of initiating a penetration sequence, followed by an injection sequence and followed by a withdrawal sequence, wherein a previous sequence triggers a subsequent sequence, and wherein the subsequent sequence is triggered before the previous sequence has ended.

Claims

1. Method of operating an injection device, which device comprises a housing, a needle shield arranged inside the housing for allowing attachment of a needle to the cartridge, a medicament cartridge and a needle attached to said cartridge, means for an automatic penetration of the needle, means for an automatic injection of medicament and means for an automatic withdrawal of needle, and a single-component joint activation housing having a penetration trigger means configured to initiate an automatic penetration sequence, an injection trigger means configured to initiate an automatic injection sequence, and a withdrawal trigger means configured to initiate an automatic needle withdrawal, comprising the steps of initiating a penetration sequence, followed by an injection sequence and followed by a withdrawal sequence, wherein a previous sequence triggers a subsequent sequence, the subsequent sequence is triggered before the previous sequence has ended, and withdrawal comprises displacement of the needle without displacement of the needle shield that is arranged inside the housing.

2. Method according to claim 1, wherein the first sequence is triggered by manual operation.

3. Method according to claim 2, wherein the manual operation comprises acting on a component on the device.

4. Method according to claim 2, wherein the manual operation comprises pressing the device against the injection site.

5. Method according to claim 3, wherein the sequence of manual operation is to first press against injection site and then act on a component of the device.

6. Injection device comprising a housing, a needle shield, a medicament cartridge and a needle attached to said cartridge, means for an automatic penetration of the needle, means for an automatic injection of medicament and means for an automatic withdrawal of the needle, and a single-component joint activation housing having penetration trigger means for initiating an automatic penetration sequence, injection trigger means configured to initiate an automatic injection sequence, and withdrawal trigger means configured to initiate an automatic needle withdrawal, wherein said trigger means are designed such that a subsequent sequence is triggered before the previous sequence has ended, and withdrawal comprises displacement of the needle without displacement of the needle shield, and the needle shield is arranged inside the housing for allowing attachment of a needle to the cartridge.

7. The injection device of claim 6, wherein the needle shield comprises protrusions configured to enter a recess on an inner surface of the housing when the needle shield is manually pushed forward for covering the needle.

8. The injection device of claim 6, wherein the automatic needle penetration means comprises an activation button, a penetration spring, a penetration sleeve arranged to interact with the needle shield, and a lockout sleeve arranged to interact with the penetration sleeve;

and the penetration sleeve is arranged to interact with the penetration trigger means when the needle shield is pushed against an injection site such that the activation button is enabled to be depressed for initiating the penetration sequence.

9. The injection device of claim 6, wherein the medicament injection means comprises an injection release ring, a plunger, and an injection spring;

and the injection release ring is arranged to interact with the injection trigger means for initiating the injection sequence.

10. The injection device of claim 6, wherein the withdrawal means comprises a retraction release ring and a retraction spring;

and the retraction release ring is arranged to interact with the withdrawal trigger means for initiating the withdrawal sequence.

11. The injection device of claim 6, wherein the penetration trigger means is a circumferential groove.

12. The injection device of claim 6, wherein the injection trigger means is flexible tongues having inwardly directed ledges.

13. The injection device of claim 6, wherein the withdrawal trigger means is flexible arms having inwardly directed ledges having outwardly extending protrusions.