Improvements in injection devices

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/315 (2006.01) A61M 5/19 (2006.01) A61M 5/24 (2006.01)

Patent

CA 2151832

A piston rod device for use in an injection device for an injection cartridge is provided with a single or multiple thread (3) along a predetermined portion of its length, after which the thread (3) changes into a longitudinal groove (5) for each thread, such that a turning movement of the piston rod will turn into an axial movement after said predetermined length. The thread (3) is shaped as one or more helicoidal grooves in the surface of the piston rod (1), said grooves (3) turning into longitudinal grooves (5) after the predetermined length. A nut element (6) cooperates with the thread (3), and its device for cooperating consists of at least one radial inwardly directed projection (10) for each thread, said projection (10) or projections guiding the piston rod (1) by the groove or grooves forming said thread (3).

L'invention concerne un dispositif à tige de piston destiné à être utilisé dans un dispositif d'injection pour cartouche d'injection. Ledit dispositif à tige de piston présente un seul ou plusieurs filets (3) sur une partie prédéterminée de sa longueur, au-delà de laquelle chaque filet (3) devient une rainure longitudinale (5) de sorte que le mouvement de rotation de la tige de piston se transforme en un mouvement axial au-delà de cette longueur prédéterminée. Le ou lesdits filets (3) se présentent sous forme de rainures hélicoïdales dans la tige de piston (1), lesquelles deviennent, au-delà de la longueur prédéterminée, des rainures longitudinales (5). Un élément à écrou (6) coopère avec le filet (3) grâce à un dispositif doté d'au moins une saillie (10) orientée radialement vers l'intérieur pour chaque filet et guidant la tige de piston (1) au moyen de la ou des rainures formant ledit filet.

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