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US 4,976,701 AGranted
Injection apparatus
AssigneeNordisk Gentofte A/S
InventorsHenning M. Ejlersen, Flemming Tullin
Life of this patent
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AssigneeNordisk Gentofte A/S
InventorsHenning M. Ejlersen, Flemming Tullin
Estimating the term…
An injection apparatus has a jacket having a front end and a cartridge for containing a liquid having a rubber membrane closing a front end of the cartridge at the front end of the jacket. A double-ended needle is held in a needle holder such that both ends thereof are exposed and oriented, one end at the membrane for piercing the membrane to obtain the liquid from the cartridge, and the opposite end for injecting the liquid. First cooperative threads on a cap and the jacket are for screwing the cap onto the jacket and unscrewing the cap therefrom, the first cooperative threads having a first pitch and a first rotational hand. Second cooperative threads are on the needle holder and one of the cap and cartridge, the second cooperative threads having a second pitch and a second rotational hand, which is opposite of the first rotational hand, for moving the needle holder and needle axially upon relative rotation between the cap and cartridge, whereby the one end of the needle pierces the membrane when the cap is unscrewed. A protective case is slidable in the cap axially for protecting the opposite end of the needle at least when the cap is screwed onto the jacket and while the cap is being unscrewed therefrom. A compression coil spring in the cap biases the protective case towards the needle holder at least while the cap is being unscrewed from the jacket.
In an injection apparatus having a cylindrical jacket to receive a cartridge having a membrane, and a cap having internal threads for cooperation with external threads on said jacket, as well as a double ended needle placed in a needle holder which is provided with external threads for cooperation with internal threads in the cartridge so that axial movement of the needle holder produced by screwing said holder into said cartridge causes one, end of the needle to penetrate the membrane of the cartridge in one end position of the needle holder, the external and internal threads being so shaped and arranged with respect to each other that the one end of the needle thereafter is pulled out of the membrane by application of the cap, the improvement in that a protective case for the opposite end of the needle is slidably arranged in the cap, and that a compression coil spring is so mounted in the cap between a fixed portion thereof and a portion of the protective case as to urge the latter from a retracted position towards the needle holder.
In an injection apparatus having a cylindrical jacket to receive a cartridge having a membrane, and a cap having first internal threads for cooperation with external threads on said jacket, as well as a double ended needle placed in a needle holder mounted slidably, but fixed against rotation, on the cartridge, and having external threads for cooperation with second internal threads in the cap, said second threads having a considerably greater pitch than said first internal threads in the cap so that axial movement of the needle holder produced by screwing said holder into said cartridge causes one end of the needle to penetrate the membrane of the cartridge in one end position of the needle holder, the external and internal threads being so shaped and arranged with respect to each other that the one end of the needle thereafter is pulled out of the membrane by application of the cap, the improvement in that a protective case for the opposite end of the needle is slidably arranged in the cap, and that a compression coil spring is so mounted in the cap between a fixed portion thereof an da portion of the protective case as to urge the latter from a retracted position towards the needle holder.
An injection apparatus, comprising:
Dependencies are inferred from the claim text.