Needleless hypodermic injection system, application device and medication cartridge therefor
First Claim
1. An application device for needleless hypodermic injection of a liquid medication said application device comprising a) a housing having a length axis and an outer contact surface which is adapted to be applied on a skin surface through which an injection is to be applied;
- b) said housing containing ejection means causing ejection of said liquid medication in order to perform an injection and actuator means for activating said ejection means; and
c) position detecting means for detecting whether said contact surface of said housing exerts a predetermined pressure on said skin surface and whether at the same time said length axis of said housing is positioned substantially normal to said skin surface, the distribution of said pressure over the area of said contact surface being substantially uniform, said means for detecting enabling said actuator means when the latter conditions are satisfied.
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Accused Products
Abstract
A needleless hypodermic injection system for injecting a liquid medication, which system comprises a disposable cartridge which contains a medication and which comprises a propellant and an igniter, and a reusable application device which comprises a pressure chamber for receiving the medication cartridge, actuation means including an ignition system and means for ensuring reliability and safety of the system. The reusable application device comprises: (a) a housing including a fist housing section and a second housing section which are adapted to be assembled together by a screwing operation, the first housing section comprising a front part having an injection outlet and a chamber adapted to receive a the cartridge contains the medication to be injected and also contains a propellant and an igniter, and (b) means for selectively activating said igniter of said cartridge when predetermined conditions are fulfilled.
19 Citations
17 Claims
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1. An application device for needleless hypodermic injection of a liquid medication said application device comprising
a) a housing having a length axis and an outer contact surface which is adapted to be applied on a skin surface through which an injection is to be applied; -
b) said housing containing ejection means causing ejection of said liquid medication in order to perform an injection and actuator means for activating said ejection means; and
c) position detecting means for detecting whether said contact surface of said housing exerts a predetermined pressure on said skin surface and whether at the same time said length axis of said housing is positioned substantially normal to said skin surface, the distribution of said pressure over the area of said contact surface being substantially uniform, said means for detecting enabling said actuator means when the latter conditions are satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 15, 16, 17)
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8. A reusable application device for needleless hypodermic injection of a liquid medication said application device comprising
a) a housing having a length axis and an outer contact surface which is adapted to be applied on a skin surface through which an injection is to be applied wherein the housing comprises a first section and a second section which are adapted to be connected with each other to form a housing assembly, said first housing section comprising a chamber for receiving a cartridge containing a medication unit which contains a liquid medication, said first housing section having a symmetry axis which extends along its length and a front part having the outer contact surface which is adapted to be applied on a skin surface, said contact surface having an opening through which liquid medication ejected from said cartridge can pass and be injected through said skin surface; -
b) said housing containing ejection means causing ejection of said liquid medication in order to perform an injection and actuator means for activating said ejection means wherein a first part of the ejection means is contained in said cartridge and a second part of said ejection means is contained in said second housing section;
c) assembly detecting means which reach a first predetermined state when said first housing section is properly and completely assembled with said second housing section to form said housing assembly, said assembly detecting means being located within said housing assembly;
d) position detecting means for detecting whether said contact surface of said housing exerts a predetermined pressure on said skin surface and whether at the same time said length axis of said housing is positioned substantially normal to said skin surface, the distribution of aid pressure overt the area of said contact surface being substantially uniform, said means for detecting enabling said actuator means when the latter conditions are satisfied wherein the position detecting means are located in part within said first housing section and in part in said section housing section, said position detecting means reaching a second predetermined state when the following conditions are simultaneously satisfied by the relative position of said housing assembly with respect to said skin surface, d.2) said contact surface of said first section exerts a predetermined pressure on said skin surface, the distribution of said pressure over the area of said contact surface being substantially uniform, and d.3) said symmetry axis of said first section is positioned substantially normal to said skin surface; and
e) the actuator means are normally disabled and become operable only upon being enabled by a combination of predetermined effects provided by said assembly detecting means after they reach said first predetermined state, and said position detecting means when they reach said second predetermined state. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification