Patent No. EP3481464 (titled "Drug Delivery Device With Pneumatic Power Pack") was filed by SHL Medical on Jun 30, 2017. The application was issued on Nov 25, 2020.
A drug delivery device with a pneumatic power pack that uses pressurized gas to propel a plunger and eject medicament from a syringe. The power pack includes a pressurized gas source, valve, and sleeve that receives and contains the gas, which is then transmitted to the plunger through a gas-tight engagement. Activation of the valve releases the pressurized gas, which flows into the sleeve and propels the plunger in a distal direction to eject the medicament.

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