Injection device
First Claim
1. An injection syringe apparatus in which when a dose is set an injection button elevates from an end of the syringe apparatus a distance proportional to the set dose, the injection syringe apparatus comprising:
- a. a non-rotatable, longitudinally displaceable, guided threaded piston rod having a distal end for pressing medicine out of a cartridge;
b. a tubular element that is rotatable and axially displaceable, wherein the injection button is fixed to the tubular element at a proximal end of the tubular element so that the injection button rotates and translates with the tubular element;
c. a housing element;
d. a nut element threadedly engaging the thread on the piston rod thereby forming a first threaded arrangement, wherein the nut element screws up the piston rod away from a defined position in the housing element and can be pressed back to the defined position carrying the piston rod with it when a set dose is injected, wherein the axial distance the nut element is moved is less than the axial distance the injection button is moved;
wherein the nut element comprises a connecting element comprised of connection bars or a tubular connection element for rotating the nut element when setting the dose;
e. a dose setting drum that rotates during the setting of a dose, the dose setting drum being threadedly engaged with the housing element via a second threaded arrangement so that when the threaded dose setting drum is rotated it is axially displaced relative to the housing element, wherein the second threaded arrangement is different than the first threaded arrangement so that the injection button has a larger stroke than the piston rod;
f. a helical scale disposed on an exterior surface of the dose setting drum; and
g. a coupling that couples and decouples rotational motion of the dose setting drum with the tubular element and the injection button, the coupling comprised of a pair of releaseably engageable elements, wherein when a dose is set by rotating the dose setting drum, the tubular element and dose setting drum rotate together but when a user injects a dose by pressing on the injection button, the dose setting drum is rotationally decoupled from the tubular element so that the dose setting drum rotates back to a zero position while the tubular element, the nut element, the piston rod, and the injection button move axial without rotating.
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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.
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Citations
36 Claims
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1. An injection syringe apparatus in which when a dose is set an injection button elevates from an end of the syringe apparatus a distance proportional to the set dose, the injection syringe apparatus comprising:
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a. a non-rotatable, longitudinally displaceable, guided threaded piston rod having a distal end for pressing medicine out of a cartridge; b. a tubular element that is rotatable and axially displaceable, wherein the injection button is fixed to the tubular element at a proximal end of the tubular element so that the injection button rotates and translates with the tubular element; c. a housing element; d. a nut element threadedly engaging the thread on the piston rod thereby forming a first threaded arrangement, wherein the nut element screws up the piston rod away from a defined position in the housing element and can be pressed back to the defined position carrying the piston rod with it when a set dose is injected, wherein the axial distance the nut element is moved is less than the axial distance the injection button is moved;
wherein the nut element comprises a connecting element comprised of connection bars or a tubular connection element for rotating the nut element when setting the dose;e. a dose setting drum that rotates during the setting of a dose, the dose setting drum being threadedly engaged with the housing element via a second threaded arrangement so that when the threaded dose setting drum is rotated it is axially displaced relative to the housing element, wherein the second threaded arrangement is different than the first threaded arrangement so that the injection button has a larger stroke than the piston rod; f. a helical scale disposed on an exterior surface of the dose setting drum; and g. a coupling that couples and decouples rotational motion of the dose setting drum with the tubular element and the injection button, the coupling comprised of a pair of releaseably engageable elements, wherein when a dose is set by rotating the dose setting drum, the tubular element and dose setting drum rotate together but when a user injects a dose by pressing on the injection button, the dose setting drum is rotationally decoupled from the tubular element so that the dose setting drum rotates back to a zero position while the tubular element, the nut element, the piston rod, and the injection button move axial without rotating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An injection syringe apparatus in which, an injection button elevates a distance proportional to a set dose, the syringe apparatus comprising:
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a non-rotating, longitudinally displaceable, guided threaded piston rod; a nut element having a connection element comprised of either connection bars or a tubular connection element for rotating the nut element, the nut element threaded to the piston rod via a first threaded arrangement so that when it rotates it moves longitudinally along the piston rod; a tubular element that rotates with the nut element and connection element, the tubular element having the injection button disposed on a proximal end of the tubular element; a dose setting drum threadedly engaged with a housing element via a second different threaded arrangement, the dose setting drum comprising a scale on its outer surface; a coupling that couples and decouples rotational movement of the dose setting drum and the tubular element, wherein a spring biases the coupling so that the coupling is in a coupled state until the injection button is pressed; wherein during dose setting; the dose setting drum, tubular element, and nut element are coupled together so that they rotate together, and the nut element is screwed up along the piston rod in a proximal direction and away from a defined position in the housing element while the dose setting drum is screwed up relative to the housing element also in a proximal direction and carries with it the injection button in a proximal direction; and wherein when the injection button is pressed; the coupling decouples rotation of the dose setting drum from the tubular element so that the tubular element, the nut element, and the piston rod move longitudinally without rotating while the dose setting drum moves axially and rotates to a zero position, and wherein the stroke of the injection button is greater than the stroke of the piston rod; and wherein the distance the nut element was screwed up along the piston rod during dose setting corresponds to the size of the dose. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An injection syringe apparatus in which when a dose is set an injection button elevates a distance proportional to the set dose, the syringe apparatus comprising:
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a non-rotating, longitudinally displaceable, guided threaded piston rod; a nut element having a connection element comprised of either connection bars or a tubular connection element for rotating the nut element, the nut element threaded to the piston rod via a first threaded arrangement so that when it rotates it moves longitudinally along the piston rod; a dose setting drum threadedly engaged with a housing element via a second, different threaded arrangement, the dose setting drum comprising a scale on its outer surface; a coupling that couples and decouples rotational movement of the dose setting drum and the injection button; a spring that biases the coupling so that the coupling is in a coupled state until the injection button is pressed; wherein during dose setting; the dose setting drum, the injection button, and the nut element are coupled together so that they rotate together, and the nut element is screwed up along the piston rod in a proximal direction and away from a defined position in the housing element while the dose setting drum is screwed up relative to the housing element also in a proximal direction with the injection button; and wherein when the injection button is pressed; the coupling decouples rotation of the dose setting drum from the injection button so that the injection button, the nut element, and the piston rod move longitudinally without rotating while the dose setting drum moves axially and rotates to a zero position, and wherein the stroke of the injection button is greater than the stroke of the piston rod; and wherein the distance the nut element was screwed up along the piston rod during dose setting corresponds to the size of a set dose. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. An injection syringe apparatus in which when a dose is set an injection button elevates in a proximal direction a distance proportional to the set dose, the syringe apparatus comprising:
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a non-rotating, longitudinally displaceable, guided threaded piston rod; a nut element having connection element comprised of either connection bars or a tubular connection element for rotating the nut element, the nut element threaded to the piston rod via a first threaded arrangement so that when it rotates it moves longitudinally along the piston rod; a dose setting drum threadedly engaged with a housing element via a second different threaded arrangement, the dose setting drum comprising a scale on its outer surface; a coupling that couples and decouples rotational movement of the dose setting drum and the nut element; wherein during dose setting; the dose setting drum and nut element are coupled together so that they rotate together, and the nut element is screwed up along the piston rod in a proximal direction and away from a defined position in the housing element while the dose setting drum is screwed up relative to the housing element also in a proximal direction along with the injection button; and wherein during injection; the coupling decouples rotation of the dose setting drum from the nut element, and the nut and piston rod move longitudinally without rotating while the dose setting drum moves axially and rotates to a zero position, and wherein the stroke of the injection button is greater than the stroke of the piston rod; and wherein the distance the nut element was screwed up along the piston rod during dose setting corresponds to the size of a set dose. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. An injection syringe apparatus in which when a dose is set an injection button elevates in a proximal direction a distance proportional to the set dose, the syringe apparatus comprising:
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a threaded piston rod; a nut element that threadedly engages with the piston rod and that screws up along the piston rod in a proximal direction during dose setting; a dose setting drum threadedly engaged with a housing element, the dose setting drum comprising a scale on its outer surface; a tubular element connected to the dose setting member and having a plurality of teeth disposed thereon; a coupling that couples and decouples rotational movement of the dose setting drum and the nut element; a ring element that moves axially but does not rotate and follows the dose setting drum when the drum moves axially, the ring element having a set of teeth that are complementary and engage the teeth on the tubular element; wherein during dose setting; the dose setting drum and tubular element and nut element are coupled together so that they rotate together, and the nut element is screwed up along the piston rod in a proximal direction and away from a defined position in the housing element while the dose setting drum is screwed up relative to the housing element also in a proximal direction and carries with it the injection button in a proximal direction wherein during dose setting the teeth on the tubular element click over the teeth on the ring element; and wherein during injection; the coupling decouples rotation of the dose setting drum from the tubular element and the nut element, and the tubular element move longitudinally without rotating and the piston rod moves in a distal direction to expel drug while the dose setting drum moves axially and rotates to a zero position, and wherein the stroke of the injection button is greater than the stroke of the piston rod and wherein teeth on the tubular element move into and engage the teeth on the ring element.
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Specification