Injection devices
First Claim
1. An autoinjector, comprising:
- a body portion (12) for receiving in use a syringe or cartridge (60) having a bung slideably mounted therein for expelling a dose;
a drive mechanism (35, 22, 26, 28) including a stored energy device (35) and adapted to be released from a cocked position to a fired position on actuation of a trigger (14), said mechanism when released being operable to drive the bung to expel a dose; and
a cocking arrangement (8, 30, 40), comprising an elongate flexible element (8) configured to be pulled to energize said drive mechanism in order to cock said drive mechanism into a mode ready for subsequent release by said triggerwherein said cocking arrangement includes a mechanical advantage configuration (38, 8) whereby a stroke of movement of said elongate flexible member (8) is substantially greater than a stroke of linear movement of said drive mechanism.
1 Assignment
0 Petitions
Accused Products
Abstract
An autoinjector device comprises a drive housing 10 and a syringe housing 12 which can be disconnected to allow insertion of a syringe. A drive mechanism in the drive housing is cocked by means of a cord 8 connected between the drive housing and the syringe housing. The drive mechanism comprises a drive gear 22 rotatably mounted in the drive housing and acting as a rotary crank connected by a connecting rod 26 to a plunger 28. In use the drive gear 22 is driven by a torsion spring 35 so that the drive mechanism extends the syringe from the syringe housing and expels a dose and then retracts the syringe back into the housing. A firing button 14 releases the drive gear to be driven by the torsion spring but is also engageable as a brake on the rim of the drive gear.
35 Citations
18 Claims
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1. An autoinjector, comprising:
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a body portion (12) for receiving in use a syringe or cartridge (60) having a bung slideably mounted therein for expelling a dose; a drive mechanism (35, 22, 26, 28) including a stored energy device (35) and adapted to be released from a cocked position to a fired position on actuation of a trigger (14), said mechanism when released being operable to drive the bung to expel a dose; and a cocking arrangement (8, 30, 40), comprising an elongate flexible element (8) configured to be pulled to energize said drive mechanism in order to cock said drive mechanism into a mode ready for subsequent release by said trigger wherein said cocking arrangement includes a mechanical advantage configuration (38, 8) whereby a stroke of movement of said elongate flexible member (8) is substantially greater than a stroke of linear movement of said drive mechanism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18)
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16. An autoinjector, comprising:
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a body portion (10,12) for receiving in use a syringe or cartridge (60) having a bung slideably mounted therein for expelling a dose; and a drive mechanism including a stored energy device (35) and adapted to be released from a cocked position to a fired position on actuation of a trigger (14), said mechanism when released being operable to drive the bung to expel a dose, said drive mechanism including a rotary crank element (22) rotatable about a rotary axis, a slideable drive plunger (28) displaceable along a drive axis, and a connecting rod (26) pivotally coupled to said rotary crank element and said slideable drive plunger in a crank-slider relationship, wherein said stored energy device (35) is configured to act on said rotary crank element.
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17. An autoinjector, comprising:
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a body portion (10, 12) for receiving in use a syringe or cartridge (60) having a bung slideably mounted therein for expelling a dose; and a drive mechanism including stored energy device (35) and adapted to be released from a cocked position to a fired position on actuation of a trigger (14), said mechanism when released being operable to drive the bung to expel a dose, wherein said drive mechanism includes a user operable arrangement (14) for applying or modulating a braking force to control the speed of operation of said mechanism.
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Specification