Injection device

• US 20040220525A1
• Filed: 09/08/2003
• Published: 11/04/2004
• Est. Priority Date: 01/07/2000
• Status: Active Grant

• Current Assignee: Valeritas, Inc. (Zealand Pharma A/S)
• Original Assignee: Valeritas, Inc. (Zealand Pharma A/S)
• Inventors: Willis, John P., Minior, Thaddeus G.
• Granted Patent: US 7,806,867 B2
• Time in Patent Office: Days
• US Class Current: 604/141
• CPC Class Codes: A61M 2005/3123 having air entrapping or venting means, e.g. purging channels in pistons
• CPC Class Codes: A61M 2005/3128 Incorporating one-way valves, e.g. pressure-relief or non-return valves
• CPC Class Codes: A61M 5/2046 Media being expelled from injector by gas generation, e.g. explosive charge
• CPC Class Codes: A61M 5/30 Syringes for injection by jet action, without needle, e.g. for use with replaceable ampoules or carpules
• CPC Class Codes: A61M 5/3007 with specially designed jet passages at the injector's distal end
• CPC Class Codes: A61M 5/484 Regulating injection pressure

Abstract

An injection device includes a housing having a proximal end and a distal end, the housing defining a distal opening, and a first opening in a side of the housing and between the proximal and distal ends; a propellant disposed inside the housing and spaced from the distal end; and a movable member disposed inside the housing and between the distal end and the propellant, wherein the propellant is in fluid communication with the movable member and the first opening.

Claims

1. An injection device, comprising:

a housing having a proximal end and a distal end, the housing having

a distal opening,

a propellant disposed inside the housing and spaced from the distal end;

a piston having a first cavity disposed inside the housing between the distal end and the propellant; and

a hollow sleeve configured to mate with the piston the sleeve having a second cavity,

wherein a fluid travels between the interior of the housing to the exterior of the injection device without passing through the distal opening of the housing.

27. The device of claim 1, wherein the hollow sleeve has a surface with at least one hole.

28. The device of claim 1, wherein the piston has at least one hole and a surface adjacent the surface of the sleeve.

2-26. -26. (canceled)

29. An injection device comprising at least a first, second, third and fourth housings,

wherein the third housing has a syringe adaptor housing having an outer vent sleeve,

a movable piston having an end and at least one relief hole,

a fixed sleeve adjacent the movable piston and having a groove with a hole,

a drive piston adjacent the end of the movable piston and having at least one groove, and

a sealing device within the groove of the drive piston.

30. The device of claim 29, wherein the first housing is demountably attached to the second housing.

31. The device of claim 29, wherein the second housing is demountably attached to the third housing.

32. The device of claim 29, wherein the third housing is demountably attached to the fourth housing.

33. The device of claim 29, wherein the first housing includes a button and a battery adjacent the button.

34. The device of claim 29, wherein the second housing has an inner housing,

electrical contacts within the inner housing,

a wire within the inner housing and in electrical communication with the electrical contacts, and

a gas generant within the inner housing.

35. The device of claim 29, wherein the fourth housing has a plunger having an end,

a syringe adjacent the end of the plunger,

and an elastomeric spring adjacent the syringe.