Syringe

Claim 2

A hypodermic syringe comprising, in combination, a body assembly, an elongated preparation container having a fixed sealed end and a movable sealed end mounted on said body assembly, a tube in communication with and extending through said preparation container disposed substantially within the length thereof and fixed with respect thereto, a hollow needle slidably positioned with said tube sealingly extrusible through said fixed sealed end, an auxiliary plunger slidably mounted upon said body assembly and adapted to be received within said tube to extrude said needle through said fixed sealed end, and an actuating plunger slidably mounted upon said body assembly and adapted to engage said container movable sealed end to expel the contents of said preparation container through said extruded needle.

Claim 3

A hypodermic syringe as recited in claim 1, further comprising locking means engaging said auxiliary plunger to lock said hollow needle in the extruded position.

Claim 4

A hypodermic syringe as recited in claim 2, wherein a hollow block is slidably mounted on said actuating plunger and one end of said auxiliary plunger is secured to said block.

Claim 5

A hypodermic syringe as recited in claim 3, wherein a stop member is mounted on said block and is adapted to be manually actuated in the direction of release.

Claim 6

A hypodermic syringe as recited in claim 1, wherein said preparation container is an interchangeable preparation cartridge, and a hingeable seal is affixed to said body assembly to receive said cartridge.

Claim 7

A hypodermic syringe comprising a body member, a preparation container supported within said body member, a preparation contained within said preparation container, a tube extending through said preparation container, a hollow needle positioned within said tube, a thin seal mounted across the front end of said tube, a first sealing plug mounted in the rear end of said tube, an opening in said needle near the rear end thereof, a hole in said tube near the front end thereof, a second sealing plug mounted in the rear end of said preparation container, a first longitudinal bore extending through said second sealing plug, said tube extending through said first longitudinal bore, a piston rod, a handle attached to the rear end of said piston rod, an elongated slot extending longitudinally along said piston rod, a piston attached to the front end of said piston rod, said piston adapted to slide into said preparation container into engagement with said second sealing plug, a block mounted around said piston rod, a rib extending through said block and in sliding engagement in said elongated slot, a second longitudinal bore through said piston, an auxiliary piston within said second longitudinal bore, the rear end of said auxiliary piston being attached to said block, said auxiliary piston being adapted to enter said tube and engage said first sealing plug, locking means attached to said block, such that when said block is slid forward said auxiliary piston moves forward into said tube and engages said first sealing plug, such that when said first sealing plug is moved forward and moves said needle forwardly, said needle breaks the thin seal and moves to its advanced position and Is locked in this advanced position by said locking means, said hole in said tube and said opening in said needle being aligned in this advanced position said handle is then depressed such that said piston rod moves forward, moving said piston into engagement with said second sealing plug, said second sealing plug thus forces the preparation through the aligned hole in the tube and opening in the needle and the preparation is ejected through said needle.

Claim 8

A hypodermic syringe comprising a body member, a preparation container supported within said body member, a preparation contained within said preparation container, a tube extending through said preparation container, a hollow needle positioned within said tube, a thin seal mounted across the front end of said tube, a first sealing plug mounted in the rear end of said tube, an opening in said needle near the rear end thereof, a hole in said tube near the front end thereof, a second sealing plug mounted in the rear end of said preparation container, a first longitudinal bore extending through said second sealing plug, said tube extending through said first longitudinal bore, a piston rod, a handle attached to the rear end of said piston rod, an elongated slot extending longitudinally along said piston rod, a piston attached to the front end of said piston rod, said piston adapted to slide into said preparation container into engagement with said second sealing plug, a block mounted around said piston rod, a rib extending through said block and in sliding engagement in said elongated slot, a second longitudinal bore through said piston, an auxiliary piston within said second longitudinal bore, the rear end of said auxiliary piston being attached to said block, said auxiliary piston being adapted to enter said tube and engage said first sealing plug, locking means attached to said block, such that when said block is slid forward said auxiliary piston moves forward into said tube and engages said first sealing plug, such that when said first sealing plug is moved forward and moves said needle forwardly, said needle breaks the thin seal and moves to its advanced position and Is locked in this advanced position by said locking means, said hole in said tube and said opening in said needle being aligned in this advanced position said handle is then depressed such that said piston rod moves forward, moving said piston into engagement with said second sealing plug, said second sealing plug thus forces the preparation through the aligned hole in the tube and opening in the needle and the preparation is ejected through said needle.

Claim 9

A preparation cartridge comprising a body member, a tube extending through said body member, a hollow needle positioned within said tube, and a first sealing plug mounted in the rear end of said body member.

Claim 10

A preparation cartridge comprising a body member, a tube extending through said body member, a hollow needle positioned within said tube, and a first sealing plug mounted in the rear end of said body member.

Claim 11

A preparation cartridge as recited in claim 7, further comprising a second sealing plug mounted in the rear end of said tube, a longitudinal bore extending through said first sealing plug, said tube extending through said longitudinal bore.

Claim 12

A preparation cartridge as recited in claim 8, further comprising a hole in said tube near the front end thereof and an opening in said needle near the rear end thereof, such that a connecting path is provided between the interior of the hollow needle and the interior of the body member.

Claim 13

A preparation cartridge as recited in claim 9, further comprising a thin seal mounted across the front end of said tube, a front opening in the body member adjacent the front end of the needle and a front seal sealing said front opening, said tube being supported by said front seal.

Claim 14

A preparation cartridge as recited in claim 10, further comprising laterally projecting claw-shaped extensions affixed to said first sealing plug adapted to be retained in a folded position by engagement with the body member.