The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 1990
Filed:
Sep. 08, 1988
Henning M Ejlersen, Vedbaek, DK;
Flemming Tullin, Ballerup, DK;
Nordisk Gentofte A/S, Gentofte, DK;
Abstract
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.