Multiple-compartment syringe

Claim 2

A syringe for injecting two or more different injection liquids which may not be in contact with each other for a long period of time, comprising: a rotationally symmetrical barrel which is open at each end, to which barrel a finger grip means is connectable; a piston which is movable in the barrel and seals same, to which piston a piston rod is connectable; a needle or means to connect same to the front end of the barrel; a sealing stopper, the dimensions of which are such that it can be provided sealingly in the opening on the front end of the barrel; at least one separating stopper to be provided in the barrel and movable therein, said stopper having a circumference that sealingly adjoins the inner wall of the barrel, thereby keeping the injection liquids present in the barrel separated from each other prior to use of the syringe; and a needle holder comprising a collar which is sealingly engageable with the front end of the barrel; a neck for sealable attachment to an injection needle; a hollow shaft between the collar and the neck; a plurality of spacing supports included in the rear face of the neck; and a passage formed in the inner wall of the shaft and the rear face of the neck, said syringe being characterized in that the space bounded by the inner wall of the shaft and the spacing supports on the rear face of the neck has the same or a slightly larger circumference than the circumference of the inner wall of the barrel and is slightly longer than the length of the collective stoppers, so that in the extreme forward position the collective stoppers can substantially entirely fill said space, in which however at least one opening remains between the stoppers and the inner wall of the shaft, said opening extending to a point behind the stoppers.

Claim 3

A syringe for injecting two or more different injection liquids which may not be in contact with each other for a long period of time, comprising: a rotationally symmetrical barrel which is open at each end, to which barrel a finger grip means is connectable; a piston which is movable in the barrel and seals same, to which piston a piston rod is connectable; a needle or means to connect same to the front end of the barrel; a sealing stopper, the dimensions of which are such that it can be provided sealingly in the opening on the front end of the barrel; at least one separating stopper to be provided in the barrel and movable therein, said stopper having a circumference that sealingly adjoins the inner wall of the barrel, thereby keeping the injection liquids present in the barrel separated from each other prior to use of the syringe; and a needle holder comprising a collar which is sealingly engageable with the front end of the barrel; a neck for sealable attachment to an injection needle; a hollow shaft between the collar and the neck; a plurality of spacing supports included in the front face of the sealing stopper; and a passage formed in the inner wall of the shaft and the rear face of the neck, said syringe being characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck of the needle holder has a slightly larger circumference than the circumference of the inner wall of the barrel and is slightly longer than the length of the collective stoppers, including the spacing supports on the sealing stopper, so that in the extreme forward position the collective stoppers can substantially entirely fill said space, in which however at least one opening remains between the stoppers and the inner wall of the shaft, said opening extending to a point behind the stoppers.

Claim 4

A syringe for injecting two or more different injection liquids which may not be in contact with each other for a long period of time, comprising: a rotationally symmetrical barrel which is open at each end, to which barrel a finger grip means is connectable; a piston which is movable in the barrel and seals same, to which piston a piston rod is connectable; a needle or means to connect same to the front end of the barrel; a sealing stopper, the dimensions of which are such that it can be provided sealingly in the opening on the front end of the barrel; at least one separating stopper to be provided in the barrel and movable therein, said stopper having a circumference that sealingly adjoins the inner wall of the barrel, thereby keeping the injection liquids present in the barrel separated from each other prior to use of the syringe; and a needle holder comprising a collar which is sealingly engageable with the front end of the barrel; a neck for sealable attachment to an injection needle; a hollow shaft between the collar and the neck; a plurality of spacing supports included in the front face of the sealing stopper; and a passage formed in the inner wall of the shaft and the rear face of the neck, said syringe being characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck of the needle holder has a slightly larger circumference than the circumference of the inner wall of the barrel and is slightly longer than the length of the collective stoppers, including the spacing supports on the sealing stopper, so that in the extreme forward position the collective stoppers can substantially entirely fill said space, in which however at least one opening remains between the stoppers and the inner wall of the shaft, said opening extending to a point behind the stoppers.

Claim 5

A syringe for injecting two or more different injection liquids which may not be in contact with each other for a long period of time, comprising: a rotationally symmetrical barrel which is open at each end, to which barrel a finger grip means is connectable; a piston which is movable in the barrel and seals same, to which piston a piston rod is connectable; a needle or means to connect same to the front end of the barrel; a sealing stopper, the dimensions of which are such that it can be provided sealingly in the opening on the front end of the barrel; at least one separating stopper to be provided in the barrel and movable therein, said stopper having a circumference that sealingly adjoins the inner wall of the barrel, thereby keeping the injection liquids present in the barrel separated from each other prior to use of the syringe; and a needle holder comprising a collar which is sealingly engageable with the front end of the barrel; a neck for sealable attachment to an injection needle; a hollow shaft between the collar and the neck; and a passage formed in the inner wall of the shaft and the rear face of the neck, said passage comprising at least one slot extending from the rear end of the shaft to the rear aperture of the needle, said slot being recessed in the inner wall of the shaft and the rear face of the neck of the needle holder, said syringe being characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck, apart from said slot, has approximately the same circumference as the inner wall of the barrel and is slightly longer than the length of the collective stoppers so that the collective stoppers, in the extreme forward position, do not cover a portion of said slot adjoining the barrel.

Claim 6

A syringe for injecting two or more different injection liquids which may not be in contact with each other for a long period of time, comprising: a rotationally symmetrical barrel which is open at each end, to which barrel a finger grip means is connectable; a piston which is movable in the barrel and seals same, to which piston a piston rod is connectable; a needle or means to connect same to the front end of the barrel; a sealing stopper, the dimensions of which are such that it can be provided sealingly in the opening on the front end of the barrel; at least one separating stopper to be provided in the barrel and movable therein, said stopper having a circumference that sealingly adjoins the inner wall of the barrel, thereby keeping the injection liquids present in the barrel separated from each other prior to use of the syringe; and a needle holder comprising a collar which is sealingly engageable with the front end of the barrel; a neck for sealable attachment to an injection needle; a hollow shaft between the collar and the neck; and a passage formed in the inner wall of the shaft and the rear face of the neck, said passage comprising at least one slot extending from the rear end of the shaft to the rear aperture of the needle, said slot being recessed in the inner wall of the shaft and the rear face of the neck of the needle holder, said syringe being characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck, apart from said slot, has approximately the same circumference as the inner wall of the barrel and is slightly longer than the length of the collective stoppers so that the collective stoppers, in the extreme forward position, do not cover a portion of said slot adjoining the barrel.

Claim 7

A syringe as claimed in claims 1, 2 or 3, characterized in that the barrel is filled with different injection liquids which are present between the piston and the separating stopper, between the separating stopper and the sealing stopper, and if more than one separating stopper is present, between the separating stoppers, the front end of the barrel being sealed by the sealing stopper which is present just rearwardly of the front end of the barrel, the front face of the stopper being substantially in line with the front end of the barrel.

Claim 8

A syringe as claimed in claims 4, 1, 2 or 3, said syringe comprising a needle holder provided with an injection needle; and a separate barrel to be connected to the needle holder, said barrel including a piston, a piston rod connected to said piston, at least two stoppers, and a finger grip attached to the exterior of the barrel.

Claim 9

A needle holder for a syringe comprising a collar with which the needle holder can be sealingly connected to the front of a barrel in which a piston and at least two stoppers can be provided, a neck in which an injection needle can be connected, and a hollow shaft connecting the collar to the neck in a sealing manner, characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck is slightly longer than the length of the collective stoppers to be provided in the barrel and has a slightly larger circumference than the inner wall of the barrel.

Claim 10

A needle holder for a syringe comprising a collar with which the needle holder can be sealingly connected to the front of a barrel in which a piston and at least two stoppers can be provided, a neck in which an injection needle can be connected, and a hollow shaft connecting the collar to the neck in a sealing manner, characterized in that the space bounded by the inner wall of the shaft and the rear face of the neck is slightly longer than the length of the collective stoppers to be provided in the barrel and has a slightly larger circumference than the inner wall of the barrel.