Needleless hypodermic injection device

摘要

A needleless hypodermic injector device comprises pyrotechnical means for generating gas sufficient for injecting a medication. The device includes a housing with a first chamber which contains a medication unit storing liquid medication to be injected and a second chamber which contains a propellant container, a propellant within the propellant container, and an igniter. The medication unit has a deformable first region and a second region with an injection outlet in liquid communication the first region. The first chamber of the housing includes two zones, a first zone containing the medication unit and a second zone which is in communication with the second chamber, so that upon ignition of the propellant in the second chamber gas generated thereby expands into the second zone of the first chamber, deforming the first region of the medication unit thereby causing ejection of the liquid medication through the ejection outlet.