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Injection device

  • US 8,747,367 B2
  • Filed: 07/28/2004
  • Issued: 06/10/2014
  • Est. Priority Date: 11/03/2003
  • Status: Active Grant
First Claim
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1. An injection apparatus comprising:

  • a housing (50) configured to receive a container (108) containing injection fluid (110);

    a piston rod (98) having a longitudinal axis (112, 114) and being provided with a thread (100), said piston rod (98) serving, in operation, for expelling injection fluid (110) from such a container (108), and being non-rotatably guided relative to the housing (50) for movement in the direction of the longitudinal axis (112, 114) thereofa threaded part (122) formed with a first thread (120) which is in engagement with the thread (100) of the piston rod (98), the position of the threaded part (122) relative to the housing (50) being adjustable;

    a setting member (76) provided for setting an injection dose by rotation of said setting member (76);

    a coupling (84, 136) arranged between the setting member (76) and the threaded part (122), said coupling (76) being closed during setting of the injection dose and open during an injection process so that the threaded part (122) is, for setting an injection dose, rotatable relative to the piston rod (98) and relative to the housing (50) and moves in the direction of the longitudinal axis (112, 114) and relative to the piston rod (98) and relative to the housing (50) during a dose-setting operation, and moves, during an injection process, axially relative to the housing (50) in an injection direction but is hindered against rotation relative to the piston rod (98),the setting member (76) being so rotatable arranged in the housing (50) that, for setting an injection dose, a combined length of the housing (50) and the setting member (76) is adjustable, from an initial combined length value, by a rotation of said housing and said setting member with respect to each other, said combined length being resettable, during an injection process, to said initial combined length value by rotating said housing (50) and said setting member (76) with respect to each other;

    a pushing member (66) being provided, which is connected to the housing (50) via a first drive connection (64, 70) and to the setting member (76) via a second drive connection (86, 94), so that the pushing member (66) moves relative to the housing in a predetermined direction when the setting member (76) is moved, likewise in that predetermined direction, by rotation relative to the housing (50) and pushes said threaded member (122) and said piston rod (98) in an injection direction during an injection process.

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