Injection device
DCFirst Claim
Patent Images
1. A drug delivery device comprising:
- a piston rod having at least one threaded portion (4);
a dose dial sleeve (17) threadedly engaged with a portion of the device and having a scale indicative of dose sizes and wherein the dose dial sleeve is rotatable during a dose setting operation so that it can be rotated to a position where a predetermined dose is indicated on the scale;
a drive sleeve (20) for driving the piston rod; and
a clutch (21), which is comprised of one or more components (33, 32), that releasably couples the dose dial sleeve (17) and the drive sleeve (20); and
wherein;
(i) during the dose setting operation the dose dial sleeve (17) and the drive sleeve (20) are coupled by the clutch so that they rotate together; and
(ii) during injecting of medication from the device, the dose dial sleeve (17) is decoupled from the drive sleeve (20) and so that it rotates back to an original pre-dose setting position upon completion of the injection but the drive sleeve (20) does not rotate during injecting of medication but instead moves in a longitudinal direction toward an injecting end of the device.
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Abstract
An injection device for injection of set doses of medicine from a cartridge, in which syringe a dose is set by screwing a nut up along a threaded piston rod, whereby a dose setting drum, which carries on its cylindrical surface along a helix a scale of which a number corresponding to the set dose is shown in a window in the housing of the syringe, and an injection button, which is elevated over the end of the syringe, are moved axially a distance which is larger than the axial movement of the nut. A gear wheel gear transmission is established between the nut and the injection button.
498 Citations
28 Claims
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1. A drug delivery device comprising:
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a piston rod having at least one threaded portion (4); a dose dial sleeve (17) threadedly engaged with a portion of the device and having a scale indicative of dose sizes and wherein the dose dial sleeve is rotatable during a dose setting operation so that it can be rotated to a position where a predetermined dose is indicated on the scale; a drive sleeve (20) for driving the piston rod; and a clutch (21), which is comprised of one or more components (33, 32), that releasably couples the dose dial sleeve (17) and the drive sleeve (20); and
wherein;(i) during the dose setting operation the dose dial sleeve (17) and the drive sleeve (20) are coupled by the clutch so that they rotate together; and (ii) during injecting of medication from the device, the dose dial sleeve (17) is decoupled from the drive sleeve (20) and so that it rotates back to an original pre-dose setting position upon completion of the injection but the drive sleeve (20) does not rotate during injecting of medication but instead moves in a longitudinal direction toward an injecting end of the device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drug delivery device and drive mechanism comprising:
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a housing (1); a dose dial sleeve (17) threadedly engaged with a threaded portion of the device, the threaded portion being located between a first end of the device and a second end of the device, a drive sleeve (20), and a clutch releasably coupling the dose dial sleeve and the drive sleeve (20), wherein, when the dose dial sleeve (17) and the drive sleeve (20) are coupled during dose setting, both are allowed to rotate with respect to the housing (1), and when the dose dial sleeve (17) and the drive sleeve (20) are de-coupled during dose administration, rotation of the dose dial sleeve (17) with respect to the housing (1) is allowed, while rotation of the drive sleeve (20) with respect to the housing (1) is not allowed, whereby axial movement of the drive sleeve is allowed so that a force is transferred in the longitudinal direction to the first end of the drug delivery device. - View Dependent Claims (9, 10, 11)
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12. A drug delivery device and drive mechanism comprising:
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a housing; a dose dial sleeve threadedly engaged with a portion of the device, the portion being located in between a needle end of the device on which a needle is mountable and an opposite end of the device, a drive sleeve, and wherein the dose dial sleeve and the drive sleeve are releasably coupled together so that; during dosing setting, the dose dial sleeve and the drive sleeve are coupled and both the dose dial sleeve and the drive sleeve rotate together with respect to the housing& and during dose administration;
the dose dial sleeve and the drive sleeve are de-coupled and the dose dial sleeve rotates with respect to the housing and the drive sleeve moves axially toward the needle end without rotating with respect to the housing. - View Dependent Claims (13, 14, 15)
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16. A medication delivery device for expelling settable doses of medication, the device comprising:
- an injection end, a housing, a dose setting drum comprising a scale indicating various dose sizes, and a tubular element that is reversibly rotationally coupled to the dose setting drum so that during dose setting the tubular element and the drum rotate together but during dose administration the tubular element is rotationally decoupled from the drum so that the drum rotates back to a zero position while the tubular element moves longitudinally toward the injection end,
the device further comprising a rod that comprises a first threaded portion that extends thru a portion of the housing, the rod coupled to the tubular element so that when the tubular element moves toward the injection end of the device, the rod also moves toward the injection end but wherein the rod travels a different distance than the tubular element, and wherein the tubular element and drum move away from the injection end during dose setting and move axially toward the injection end when a force is applied to either one or applied to both during dose administration. - View Dependent Claims (17, 18, 19, 20, 21)
- an injection end, a housing, a dose setting drum comprising a scale indicating various dose sizes, and a tubular element that is reversibly rotationally coupled to the dose setting drum so that during dose setting the tubular element and the drum rotate together but during dose administration the tubular element is rotationally decoupled from the drum so that the drum rotates back to a zero position while the tubular element moves longitudinally toward the injection end,
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22. A drug delivery device comprising:
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a piston rod (4); a dose dial sleeve (17) threadedly engaged with a portion of the device and having a scale indicative of dose sizes and wherein the dose dial sleeve is rotatable during a dose setting operation so that it can be rotated to a position where a predetermined dose is indicated on the scale; a drive sleeve (20) for driving the piston rod; and a clutch that releasably couples the dose dial sleeve (17) and the drive sleeve (20); and
wherein;(i) during the dose setting operation the dose dial sleeve (17) and the drive sleeve (20) are coupled by the clutch so that they rotate together; and (ii) during injecting of medication from the device, the dose dial sleeve (17) is decoupled from the drive sleeve (20) and so that it rotates back to art original pre-dose setting position upon completion of the injection but the drive sleeve (20) does not rotate during injecting of medication but instead moves in a longitudinal direction toward an injecting end of the device. - View Dependent Claims (23, 24)
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25. A drug delivery device comprising:
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a piston rod; a dose dial threadedly engaged with a portion of the device and having a scale indicative of dose sizes and wherein the dose dial sleeve is rotatable during a dose setting operation so that it can be rotated to a position where a predetermined dose is indicated on the scale;
a drive sleeve for transmitting a force that is received at one end of the device to drive the piston rod; andwherein the dose dial and the drive sleeve are releasably coupled so that when the device is in a dose setting mode, the dose dial and drive sleeve rotate together and allow a predetermined dose to be set, and during the injection of the predetermined dose the dose dial and the drive sleeve are decoupled and the dose dial rotates with respect to the drive sleeve and rotates to a zero position upon completion of the injection and the drive sleeve moves axially toward an injecting end of the device and wherein the drive sleeve moves a distance that is greater than a distance that is moved by the piston rod during the injecting of the predetermined dose. - View Dependent Claims (26, 27, 28)
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Specification