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Last Updated: September 25, 2020

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Patent: 5,472,422

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Summary for Patent: 5,472,422
Title: Dual-chamber injection cartridge
Abstract:A method for manufacturing an injectable preparation of a pharmaceutically active agent suitable for storage in a dual-chamber injection cartridge. A dual chamber injection cartridge is provided, including: a barrel; a front chamber for a solid component; a rear chamber for a liquid component; a displaceable front piston separating the front and rear chambers; a closure sealing the front end of the barrel; and a constriction between the front and rear ends of the barrel. The constriction has a non-circular cross-section and an openable bypass connection permitting passage of liquid between the rear and front chambers. Prior to opening the bypass connection, the front piston is positioned between the constriction and the rear end of the barrel. The constriction resists displacement of the front piston in a direction of the front end of the barrel when the piston is in the vicinity of the constriction. The constriction prevents displacement of the front piston toward the front end of the barrel when a vacuum exists in the front chamber. A pressure in the vicinity of atmospheric pressure exists in the rear chamber. The front piston is deformed while being displaced through the constriction in the direction of the front end of the barrel while overcoming the resistance. The deformation establishes the liquid bypass connection. The rear chamber is filled with the liquid component. The rear chamber is sealed. A solution of the pharmaceutically active agent is charged in the front chamber. The front chamber is sealed.
Inventor(s): Ljungquist; Olle (Taby, SE)
Assignee: Pharmacia Aktiebolag (Stockholm, SE)
Application Number:08/196,194
Patent Claims:see list of patent claims

Details for Patent 5,472,422

Applicant Tradename Biologic Ingredient Dosage Form BLA Number Approval Date Patent No. Assignee Estimated Patent Expiration Status Orphan Source
Merck Sharp & Dohme Corp. ZOSTAVAX zoster vaccine live INJECTION, POWDER, LYOPHILIZED, FOR SUSPENSION 125123 001 2006-05-25   Start Trial Pharmacia Aktiebolag (Stockholm, SE) 2012-12-05 search
Merck Sharp & Dohme Corp. ZOSTAVAX zoster vaccine live INJECTION, POWDER, LYOPHILIZED, FOR SUSPENSION 125123 1 2006-05-25   Start Trial Pharmacia Aktiebolag (Stockholm, SE) 2012-12-05 search
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Number >Approval Date >Patent No. >Assignee >Estimated Patent Expiration >Status >Orphan >Source

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