Multi-chambered syringe

Claim 2

In a syringe, or the like, the combination of: a first tubular reservoir having discharge means and containing a first material in a sterile condition; a second tubular reservoir containing a second material in a sterile condition and extending into said first reservoir; and a cup-shaped plunger having an open outer end receiving an inner end of said second reservoir and axially slidable within said first reservoir in response to axial movement of said second reservoir relative to said first reservoir to expel material from said first reservoir through said discharge means, valve means responsive to straight line, axial movement of said second reservoir relative to said plunger to open or close communication between said reservoirs without exposing the contents of either to the ambient atmosphere, said valve means including an annular portion of said plunger which is provided with a port and which is engageable with and disengageable from an annular portion of said second reservoir, said second reservoir and said plunger being freely slidable axially relative to each other to open and close said port, said open end of said plunger being provided with an external skirt having a greater external diameter than the exterior of the balance of said plunger but deformable, when said plunger is moved completely into said first reservoir, to a position in which said skirt engages both the inner circumferential wall of said first reservoir and the external circumferential wall of said second reservoir to provide additional friction resisting relative movement between said reservoirs and preventing relative movement between said plunger and said second reservoir.

Claim 3

In a syringe, or the like, the combination of: a first barrel member forming a first tubular reservoir and having an inner, discharge end and an open outer end; a second barrel member forming a second reservoir and having a closed outer end and an open inner end extending into said open end of said first barrel, said inner end of said second barrel member being provided with first and second external flanges of substantially the same diameter and longitudinally spaced apart; and a generally cup-shaped tubular plunger formed of resilient material having an inner end provided with port means and an open outer end, the external diameter of said plunger being substantially the same as the internal diameter of said first barrel member, the internal diameter of said plunger being substantially the same as the external diameter of said first and second flanges, the inner end of said plunger being provided with an annular boss adapted to fit within the open inner end of said second barrel member to form a seal and closure therefor, and said first external flange being adapted to fit snugly between said boss and the inner circumferential wall of said plunger to close said port means formed through the inner end of said plunger in a sealing position, the inner circumferential wall of said plunger being provided with an annular internal flange, said internal flange being spaced longitudinally from said boss a distance sufficient to permit longitudinal movement of said second barrel member relative to said plunger to a position in which said boss is removed from the open end of said second barrel member and open communication is provided through said port means between the interiors of said first and second barrel members, said internal flange being disposed between said external flanges on said second barrel member and engageable with said first external flange to prevent withdrawal of said second barrel member from said plunger when said plunger is within said first barrel member, said internal flange being engageable with said second external flange on said second barrel member when said second barrel member is in said sealing position relative to said plunger, said second barrel member and said plunger being freely axiallY slidable relative to each other to open and close said port means, the open end of the plunger being provided with an external skirt having a greater external diameter than the exterior of the balance of the plunger but deformable, when the plunger is moved completely into the first barrel member, to a position in which said skirt engages both the interior of said first barrel member and the exterior of said second barrel member and said second external flange to provide additional friction resisting relative movement between said barrels and preventing relative movement between said plunger and said second barrel member.

Claim 4

In a syringe, or the like, the combination of: a first barrel member forming a first tubular reservoir and having an inner, discharge end and an open outer end; a second barrel member forming a second reservoir and having a closed outer end and an open inner end extending into said open end of said first barrel, said inner end of said second barrel member being provided with first and second external flanges of substantially the same diameter and longitudinally spaced apart; and a generally cup-shaped tubular plunger formed of resilient material having an inner end provided with port means and an open outer end, the external diameter of said plunger being substantially the same as the internal diameter of said first barrel member, the internal diameter of said plunger being substantially the same as the external diameter of said first and second flanges, the inner end of said plunger being provided with an annular boss adapted to fit within the open inner end of said second barrel member to form a seal and closure therefor, and said first external flange being adapted to fit snugly between said boss and the inner circumferential wall of said plunger to close said port means formed through the inner end of said plunger in a sealing position, the inner circumferential wall of said plunger being provided with an annular internal flange, said internal flange being spaced longitudinally from said boss a distance sufficient to permit longitudinal movement of said second barrel member relative to said plunger to a position in which said boss is removed from the open end of said second barrel member and open communication is provided through said port means between the interiors of said first and second barrel members, said internal flange being disposed between said external flanges on said second barrel member and engageable with said first external flange to prevent withdrawal of said second barrel member from said plunger when said plunger is within said first barrel member, said internal flange being engageable with said second external flange on said second barrel member when said second barrel member is in said sealing position relative to said plunger, said second barrel member and said plunger being freely axiallY slidable relative to each other to open and close said port means, the open end of the plunger being provided with an external skirt having a greater external diameter than the exterior of the balance of the plunger but deformable, when the plunger is moved completely into the first barrel member, to a position in which said skirt engages both the interior of said first barrel member and the exterior of said second barrel member and said second external flange to provide additional friction resisting relative movement between said barrels and preventing relative movement between said plunger and said second barrel member.

Claim 5

A device as defined in claim 2 in which latching means is provided between the first barrel member and the external skirt for preventing the plunger from being removed from the first barrel member and preventing such deformation of said skirt, said latching means being deformable to permit said deformation of said skirt and the movement of said plunger completely into said first barrel member.

Claim 6

In a syringe, or the like, the combination of: a first barrel member having an open outer end and having discharge means; a cup-shaped plunger having an inner end extending into said open end of said first barrel member and having an open end provided with an external skirt of a diameter greater than the internal diametr of said first barrel member extending generally radially outwardly therefrom and seated on the end edge of said open end of said first barrel member; a second barrel member extending into said open end of said plunger; and said skirt being deformable, when said plunger is moved axially completely into said first barrel member by said second barrel member, into a deformed position wherein said skirt engages both the inner circumferential wall of said first barrel member and the outer circumferential wall of said second barrel member to provide additional friction resisting relative axial movement of said plunger and said barrel members.

Claim 7

In a syringe, or the like, the combination of: a first barrel member having an open outer end and having discharge means; a cup-shaped plunger having an inner end extending into said open end of said first barrel member and having an open end provided with an external skirt of a diameter greater than the internal diametr of said first barrel member extending generally radially outwardly therefrom and seated on the end edge of said open end of said first barrel member; a second barrel member extending into said open end of said plunger; and said skirt being deformable, when said plunger is moved axially completely into said first barrel member by said second barrel member, into a deformed position wherein said skirt engages both the inner circumferential wall of said first barrel member and the outer circumferential wall of said second barrel member to provide additional friction resisting relative axial movement of said plunger and said barrel members.

Claim 8

A syringe, or the like, according to claim 4, including valve means responsive to relative axial movement of said second barrel member and said plunger for opening and closing communication between said barrel members.

Claim 9

A syringe, or the like, according to claim 5, including means responsive to deformation of said skirt into said deformed position for locking said second barrel member relative to said plunger in a position to close said valve means.

Claim 10

In a syringe, or the like, the combination of: a barrel member having an open outer end and having discharge means; a cup-shaped plunger having an inner end extending into said open end of said barrel member and having an open end provided with an external skirt of a diameter greater than the internal diameter of said first barrel member extending generally radially outwardly therefrom and normally seated on the end edge of said open end of said barrel member; and said skirt being deformable, when said plunger is moved axially completely into said barrel member, into a deformed position wherein said skirt engages the inner circumferential wall of said barrel member to provide additional friction resisting relative axial movement of said plunger and said barrel member.

Claim 11

In a syringe, or the like, the combination of: a barrel member having an open outer end and having discharge means; a cup-shaped plunger having an inner end extending into said open end of said barrel member and having an open end provided with an external skirt of a diameter greater than the internal diameter of said first barrel member extending generally radially outwardly therefrom and normally seated on the end edge of said open end of said barrel member; and said skirt being deformable, when said plunger is moved axially completely into said barrel member, into a deformed position wherein said skirt engages the inner circumferential wall of said barrel member to provide additional friction resisting relative axial movement of said plunger and said barrel member.

Claim 12

A syringe, or the like, as set forth in claim 7, including means responsive to deformation of said skirt, into said deformed position, for locking said barrel member and said plunger against relative axial movement.