Needleless hypodermic injection device with non-electric primer ignition means
OwnerOtto Furst, Hans-Peter Haar +2inventors
InventorsOtto Furst, Hans-Peter Haar, George Bevan Kirby Meacham, Hans List
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Abstract
A single use needleless hypodermic injection device for injecting a liquid medication contained therein. The device includes pyrotechnical means for generating within the device a pressure necessary for injecting the medication. The device comprises impact-sensitive stab primer ignition means for igniting a propellant contained in the device. The stab primers ignite with less that 10 millijoules of mechanical energy, enabling small, low cost firing pin mechanisms contained within the device that may be economically discarded after a single use
Claims40
A needleless hypodermic injection device for delivering liquid medication contained therein, the device comprising pyrotechnical means for generating within the device a pressure necessary for injecting the medication, and ignition means for igniting a propellant contained in the device, the primer device being part of the ignition means, and comprising a primer material which is adapted to be ignited by friction of the primer material with a mechanical frictional element.
A needleless hypodermic injection device for delivering liquid medication contained therein, the device comprising pyrotechnical means for generating within the device a pressure necessary for injecting the medication, ignition means for igniting a propellant contained in the device, the ignition means comprising
- a stab primer device and a firing pin for penetrating a stab primer material stationarily arranged within the stab primer device, the stab primer/material being so positioned with respect to the propellant that when the firing pin penetrates the primer material hot products of combustion of the primer material are generated and these products ignite the propellant.
A needleless hypodermic injection device for delivering liquid medication contained in the device, the device comprising pyrotechnical means for generating within the device a pressure necessary for injecting the medication, and ignition means for igniting a propellant contained in the device, the ignition means comprising
- a slidably mounted stab primer device which is open on only one side, the open side being arranged in face of a sharp point of a stationary stab pin,
- an impact plunger for driving the stab primer device towards the stab pin so that that pin penetrates into a primer material contained in the stab primer device,
- a spring for urging the plunger towards the primer material, and
- a release latch for releasably holding the spring and thereby the plunger in a cocked position.
A needleless hypodermic injection device for delivering liquid medication contained therein, the device comprising
- (a) a cartridge which contains
- (a.1) a medication unit containing the liquid medication,
- (a.2) pyrotechnical means for generating within the device a pressure necessary for injecting the medication, and
- (a.3) ignition means for igniting a propellant contained in the device,
- the ignition means comprising a stab primer device and a firing pin for penetrating a stab primer material stationarily arranged within the device, the stab primer material being so positioned with respect to the propellant that when the firing pin penetrates the primer material hot products of combustion of the primer material are generated and these products ignite the propellant, and
- (b) a spring and trigger mechanism for striking the firing pin with such an impact that it strikes and penetrates the primer material, the spring and trigger mechanism being located outside the cartridge.
Dependencies are inferred from the claim text.