Disposable cartridge for admixing two components of injectable medicament

Claim 2

An assembly adapted for introduction into a cartridge unit having an axially movable stopper, said assembly comprising: a. a bushing having an opening at its proximal end and a transverse web at its distal end provided with a centrally located aperture therethrough; b. a sack reciprocably mounted in said bushing, said sack defining a chamber adapted to contain a fluid, having a penetrable membrane closing the distal region thereof, and being provided with means for manually ejecting the contents of said chamber; c. a double-pointed cannula having the distal end thereof extending proximally interiorly of said bushing and terminating adjacent said penetrable area of said sack, and distally beyond said transverse web of said bushing, said double-pointed cannula having stop means affixed thereto and positioned interiorly of said bushing, first and second abutment means mounted in said assembly distally and proximally of said stop means, respectively for limiting both distal and proximal reciprocation of said double-pointed cannula through said aperture in said web of said bushing upon engagement of said stop means with said first and second abutment means, respectively; and d. complementary connecting means provided on said transverse web of said bushing and said axially movable stopper adapted for removably attaching said bushing to said stopper of said cartridge unit into which said assembly is introduced.

Claim 3

An assembly as defined in claim 1, wherein said sack is provided with a resiliently collapsible wall.

Claim 4

An assembly as defined in claim 1, wherein stop means are provided on said bushing which are adapted for abutment with the proximal end of the cartridge unit into which the assembly is to be inserted and limiting distal entry of said bushing into the cartridge unit.

Claim 5

An assembly as defined in claim 1, wherein said connecting means comprise a female screw thread in said centrally located aperture of said bushing.

Claim 6

An assembly as defined in claim 1, wherein said first and second abutment means are provided, respectively, by said transverse web of said bushing and the distal end of said sack, and wherein said stop means affixed to said double-pointed cannula abuts, in the extreme distal reciprocation of said double-pointed cannula, with said transverse web of said bushing, and in the extreme proximal reciprocation of said double-pointed cannula, with said distal end of said sack.

Claim 7

An assembly adapted for introduction into a cartridge unit having a stopper, said assembly comprising: a. a bushing having an opening at its proximal end and a transverse web at its distal end provided with a centrally located aperture therein; b. a sack reciprocably mounted in said bushing, said sack defining a chamber adapted to contain a fluid, having a penetrable membrane closing the distal region thereof, and being provided with means for manually ejecting the contents of said chamber; c. a double-pointed cannula having the distal end thereof extending proximally through said aperture in said bushing and terminating adjacent said penetrable area of said sack, and distally beyond said transverse web of said bushing, said double-pointed cannula having stop means affixed thereto and positioned interiorly of said bushing, first and second abutment means mounted in said assembly distally and proximally of said stop means, respectively for limiting both distal and proximal reciprocation of said double-pointed cannula through said aperture in said web of said bushing upon engagement of said stop means with said first and second abutment means, respectively; and d. connecting means provided on said transverse web of said bushing adapted for removably attaching said bushing to the stopper of the cartridge unit into which said assembly is introduced, said connecting means comprising a male screw-threaded nipple mounted on said web of said bushing, and said centrally located aperture in said bushing being provided as an axial bore in said nipple.

Claim 8

An assembly adapted for introduction into a cartridge unit having a stopper, said assembly comprising: a. a bushing having an opening at its proximal end and a transverse web at its distal end provided with a centrally located aperture therein; b. a sack reciprocably mounted in said bushing, said sack defining a chamber adapted to contain a fluid, having a penetrable membrane closing the distal region thereof, and being provided with means for manually ejecting the contents of said chamber; c. a double-pointed cannula having the distal end thereof extending proximally through said aperture in said bushing and terminating adjacent said penetrable area of said sack, and distally beyond said transverse web of said bushing, said double-pointed cannula having stop means affixed thereto and positioned interiorly of said bushing, first and second abutment means mounted in said assembly distally and proximally of said stop means, respectively for limiting both distal and proximal reciprocation of said double-pointed cannula through said aperture in said web of said bushing upon engagement of said stop means with said first and second abutment means, respectively; and d. connecting means provided on said transverse web of said bushing adapted for removably attaching said bushing to the stopper of the cartridge unit into which said assembly is introduced, said connecting means comprising a male screw-threaded nipple mounted on said web of said bushing, and said centrally located aperture in said bushing being provided as an axial bore in said nipple.

Claim 9

An assembly as defined in claim 6, wherein said stop means comprise a piston affixed to said double-pointed cannula reciprocably mounted in a distally located axial bore in said sack, restriction means located in the distal region of said bore, said penetrable membrane of said sack closes the proximal end of said bore, and said piston abuts, in the extreme distal reciprocation of said double-pointed cannula, with said restriction means, and, in the extreme proximal reciprocation of said double-pointed cannula, with said penetrable membrane of said sack.

Claim 10

An assembly as defined in claim 6 wherein a removable cap is screw-threaded on said nipple.