Spring arrangement in an injection device
AssigneeTecPharma Licensing AG
InventorsUrsina Streit, Markus Bollenbach, Patrick Hostettler, Daniel Kuenzli
Life of this patent
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Abstract
An injection device, in some embodiments an autoinjector, which includes a thrust spring that advances an injection needle from an initial position to an insertion position from the distal end of the injection device and that causes a product to be emptied from the product reservoir by an emptying movement, and a return spring that retracts the injection needle from the insertion position into the distal end of the injection device counter to the force of the thrust spring, wherein the return spring is decoupled from the thrust spring during the emptying movement.
Claims15
An injection device for injecting a substance, comprising:
- a thrust spring that moves an injection needle carried by the injection device from an initial position to an insertion position and causes the substance to be injected, and
- a return spring that moves the injection needle from the insertion position into the injection device counter to the force of the thrust spring, wherein the return spring is decoupled from the thrust spring during the injection of the substance.
An automatic injection device comprising:
- a) a driving spring, by which an injection needle can be driven out of the distal end of the injection device from an initial position into a piercing position and by which a product can be dispensed from a product container by a dispensing movement, and
- b) a return spring, by which the injection needle can be retracted from the piecing position into the distal end of the injection device against the force of the driving spring, wherein
- c) the return spring is uncoupled from the driving spring during the dispensing movement.
A method of extending and retracting an injection needle carried at the distal end of an injection device, whereby a product is dispensed from the injection device in the extended state, the method comprising the steps of:
- a) at least partially relaxing a pre-tensioned driving spring and thereby tensioning a return spring coupled with the driving spring,
- b) relaxing the driving spring more and thereby dispensing the product, and
- c) relaxing the tensioned return spring and thereby tensioning the driving spring coupled with the return spring, wherein
- d) the driving spring and return spring are uncoupled as product is dispensed.
Dependencies are inferred from the claim text.