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Injector apparatus having a clutch to inhibit forward movement of the plunger

  • US 9,415,165 B2
  • Filed: 10/15/2010
  • Issued: 08/16/2016
  • Est. Priority Date: 10/16/2009
  • Status: Active Grant
First Claim
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1. An injector apparatus for use with a cartridge (12) or syringe to deliver a plurality of doses therefrom, the injector apparatus comprising:

  • a housing (101, 102) configured to receive the cartridge or syringe;

    a plunger (40) configured to cooperate, in use, with the cartridge or syringe to express successive doses;

    a dose setting arrangement (16, 20) to select a dose volume; and

    a drive mechanism (22, 24) releasable to advance said plunger in respective predetermined increments of magnitude to express said successive doses,wherein said drive mechanism includes a drive spring (22) for imparting movement directly or indirectly to said plunger (40), andsaid dose setting arrangement comprises a dose setting element (16) moveable in a dose setting routine to define a magnitude of an increment of movement of said plunger for a given dose,said drive mechanism further including a clutch arrangement operable to selectively engage and disengage the drive spring (22) to/from the dose setting element (16),wherein the dose setting element (16) is configured to be operably moveable between a first position and a second dose-setting position,the dose setting element (16), in the first position, being engaged to the drive spring (22) to rotate under the influence of the drive spring (22), anda movement of the dose setting element to the second dose-setting position moves the clutch arrangement into engagement with the drive mechanism and disengages the dose setting element (16) from the drive spring (22) so that, when the dose setting element (16) is in the second dose-setting position, the clutch arrangement bears a load exerted by the drive spring (22) and said dose setting element (16) is freed from the load of the drive spring (22) such that a dose-setting movement of the dose setting element (16) in said second dose-setting position for said dose setting routine is not influenced by the drive spring (22).

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