초록 ▼

A multi-cartridge dispenser for delivering two liquid medications through a single needle. The dispenser includes independent dual channel metering mechanism, dual channel drive mechanisms, and dual channel lock and pullback mechanisms. The wing must be in its “up”position for metering to take place

A multi-cartridge dispenser for delivering two liquid medications through a single needle. The dispenser includes independent dual channel metering mechanism, dual channel drive mechanisms, and dual channel lock and pullback mechanisms. The wing must be in its “up”position for metering to take place. The wing reciprocatingly moves a driver between a pre-injection position and a post-injection position to reciprocatingly advance the leadscrews upon an injection stroke. The dosage indicator automatically rotates to its initial zero position upon the injection stroke. The lock and pullback mechanism automatically prevents rotation of the leadscrew upon metering and injection. It also locks out the cartridge retainers so that the retainers can be removed from the housing only while the wing is in its “down”position. The pullback sleeve unloads a pullback key during a cartridge change in order to enable the leadscrew to be spun freely back to its home position.

대표청구항 ▼

An apparatus for the delivery of an injectable product, comprising: a housing; a container mounted to said housing and including a piston, an exit and an injectable product between said piston and said exit; a drive stem disposed in said housing and engageable with said piston; a tubular element thr

An apparatus for the delivery of an injectable product, comprising: a housing; a container mounted to said housing and including a piston, an exit and an injectable product between said piston and said exit; a drive stem disposed in said housing and engageable with said piston; a tubular element threadably coupled to said drive stem such that said tubular element is rotatable with respect to said drive stem, wherein relative rotation between said tubular element and said drive stem controls the amount of telescopic extension of said drive stem from said tubular element to establish a set dosage of injectable product to be delivered, wherein a first coupling element is secured to said tubular element for rotation with said tubular element; a drive assembly secured to said tubular element and movable with respect to said housing between a pre-injection position and a post-injection position for axially moving said drive stem with respect to said housing, to drive said piston within said container upon movement of said drive assembly from said pre-injection position to said post-injection position; and a user-engageable dose setting assembly including a second coupling element engageable with said first coupling element for rotation with said first coupling element to enable a user to effect said relative rotation between said tubular element and said drive stem, wherein said first coupling element is in engagement with and rotatable with said second coupling element while said drive assembly is in said pre-injection position, and said first coupling element is axially spaced from said second coupling element while said drive assembly is in said post-injection position, thereby preventing a user from setting a dose while said drive assembly is in its post-injection position.