Intramuscular injection device suitable for insulin injections

US4333459A · kind A · utility

Inventor

• Michael Becker · Knittlingen, DE

Key dates

• Filing date: Mar 4, 1981
• Grant date: Jun 8, 1982
• Expiry date: Mar 4, 2001

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M5/20
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A tubular pushing member, when released by the trigger of a pistol grip moves forward under the pull of a spring, releases the catch of a sliding carriage which then quickly jabs forward under the pull of another spring to jab the needle of a syringe carried by it through the patient's skin, after which the further progress of the pushing member comes up against the plunger of the syringe, which it engages with an adjustable plunger mounted on a heel bracket of the tubular pushing member. The progress of the actuation of the syringe plunger may be slowed down, interrupted or allowed to accelerate at any stage of the injection by virtue of frictional engagement with the tubular pushing member by a rubber piece mounted on the top edge of the trigger plate and a spring weaker than the trigger spring makes it possible for the braking friction to taper off gradually for better control of the movement of the syringe piston as the trigger is pulled away from the tubular pushing member against the force of the trigger spring.