Injection device with replacement cartridge

• US 20040078001A1
• Filed: 12/05/2003
• Published: 04/22/2004
• Est. Priority Date: 12/22/2000
• Status: Active Grant

• Current Assignee: Sanofi-Aventis Deutschland GmbH (Sanofi )
• Original Assignee: Dca Design International Ltd.
• Inventors: Veasey, Robert Frederick, Langley, Christopher Nigel, Woolston, Robert, Day, Shane Alistair
• Granted Patent: US 6,997,906 B2
• Time in Patent Office: Days
• US Class Current: 604/152
• CPC Class Codes: A61M 2005/31588 electrically driven
• CPC Class Codes: A61M 2205/215 Tilt detection, e.g. for warning or shut-off
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/6018 providing set-up signals for the apparatus configuration
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• CPC Class Codes: A61M 5/31525 Dosing burettes, pipettes B01L3/02
• CPC Class Codes: A61M 5/31546 Electrically operated dose setting, e.g. input via touch screen or plus/minus buttons
• CPC Class Codes: G16H 20/17 delivered via infusion or injection
• CPC Class Codes: Y10S 128/01 Motorized syringe

Abstract

An injection device for injection of a medicament from a medicament cartridge 40 is disclosed. The injection device comprises a main housing 4, a piston 50 and an end stop switch 52 in which access to the main body 4 for replacement of the medicament cartridge 40 may only be obtained when the piston 50 trips the end stop switch.

Claims

1. An injection device for injection of a medicament from a medicament cartridge 40, the injection device comprising a main housing 4, a piston 50 and an end stop switch 52 in which access to the main body 4 for replacement of the medicament cartridge 40 may only be obtained when the piston 50 trips the end stop switch.

2. An injection device according to claim 1, characterised in that tripping of the end stop switch 52 releases a catch or other fastening device to allow access to the main body 4 for replacement of the medicament cartridge 40.

3. An injection device according to claim 1 or claim 2, in which the injection device further comprises a drive mechanism 42 to drive the piston 50, an electronic control unit and a door release catch characterised in that when door release catch is operated the electronic control unit operates the drive mechanism 42 to withdraw the piston 50 until the end stop switch is contacted.

4. An injection device according to claim 3 in which the injection device further comprises a contact switch to detect the presence or absence of a medicament cartridge 40, characterised in that upon detection of a new cartridge and closing of the door release catch, the electronic control unit operates the drive mechanism 42 to advance the piston 50 into contact with the new medicament cartridge.