Dual chamber prefillable syringe

Claim 2

The dual chamber prefillable syringe according to claim 1, wherein said sealing plug (6) is formed of one piece.

Claim 3

The dual chamber prefillable syringe according to claim 1, wherein said sealing plug (6) comprises a first sealing plug (6A) and a second sealing plug (6B) by splitting the sealing plug (6) in a direction perpendicular to a thickness direction, said first sealing plug (6A) is liquid-tightly sealed at a position near the first split opening (12A) in the front chamber outer cylinder (1A), said second sealing plug (6B) is liquid-tightly sealed at a position near the second split opening (12B) of the rear chamber out cylinder (1B), and a distance from an end face of said first sealing plug (6A) at the bypass groove (3) side to an end face of said second sealing plug (6B) at the outer cylinder opening (4) side is set shorter than the length (L) of said bypass groove (3).

Claim 4

The dual chamber prefillable syringe according to claim 1, wherein said dual chamber prefillable syringe further comprises a needle mounting cylinder (22) including a base cylinder (23) and an end cylinder (24), a bottomed hollow guard (27), and a bottomed hollow sealing plug (20) made of an elastic material, the cylindrical end (5) of the front chamber outer cylinder (1A) is formed in a wide port bottle shape, the bottomed hollow sealing plug (20) is sealed in said cylindrical end (5) in such a manner that a bottom (21) of the bottomed hollow sealing plug (20) is faced to the first inner chamber (8), so that said cylindrical end (5) is liquid-tightly sealed, the base cylinder (23) of the needle mounting cylinder (22) is sealed in a hollow section of said sealing plug (20), the end cylinder (24) of the needle mounting cylinder (22) protrudes from an end opening of said cylindrical end (5), an outer peripheral surface of the end cylinder (24) is gradually reduced in diameter toward its end as a lure tapered surface (26), a cylindrical hole (25) is perforated through the needle mounting cylinder (22) from an end face of the end cylinder (24) to an end face of said base cylinder (23), a guard base (28) of the bottomed hollow guard (27) is gas-tightly secured to an outer wall of said cylindrical end (5) so that the end cylinder (24) of said needle mounting cylinder (22) is sealed in said guard (27), and a collapsible brittle portion (29) is circumferentially formed at a position of widest diameter portion of said lure tapered surface (26).

Claim 5

The dual chamber prefillable syringe according to claim 1, wherein the dual chamber prefillable syringe further comprises a stopper (50) made of an elastic material, an bottomed hollow end housing (51) and a bottomed hollow cap (65) having an elasticity, the stopper (50) is sealed in the cylindrical end (5) of the front chamber outer cylinder (1A) to liquid-tightly seal said cylindrical end (5), a distance (P) from the end opening (17) of said cylindrical end (5) to said stopper (50) is set longer than a distance (Q) from the bypass groove (3) to an end face of the plunger (7) at the bypass groove (3) side, an end (53) of the cylindrical end (5) is gas-tightly engaged within the coupling portion of the bottomed hollow end housing (51), so that a hollow section of said end housing (51) from the end opening (17) of said cylindrical end (5) to an inner surface of a bottom (55) of said end housing (51) is formed as a bypass chamber (57), a length (R) of said bypass chamber (57) is set longer than a thickness (S) of said stopper (50), said end opening (17) is included in a surface contacting with said bypass chamber (57), a plurality of bypass (59) are recessed longitudinally of said end housing (51) on an inner wall of said end housing (51), a plurality of bottom grooves (60) coupled to said bypass (59) is recessed radially on an inner surface of the bottom (55) of said end housing (51), a housing recess (61) is formed at a portion concentrated with all bottom grooves (60) to connect all the bottom grooves (60) to said housing recess (61), a needle mounting portion (63) is suspended from an outer surface of the bottom (55) of said housing (51), a small hole (64) from an end (66) of the needle mounting portion (63) to said housing recess (61) is perforated through the needle mounting portion (63), and the needle mounting portion (63) is liquid-tightly sealed with the hollow section of the bottomed hollow cap (65).

Claim 6

The dual chamber prefillable syringe according to claim 5, wherein an outer wall surface of the needle mounting portion (63) is gradually reduced in diameter toward its end as a lure tapered surface (26), and an inner wall surface of the bottomed hollow cap (65) is formed in the same tapered surface as said lure tapered surface (26).

Claim 7

The dual chamber prefillable syringe according to claim 5, wherein said dual chamber prefillable syringe further comprises a needle tube (71) and a cap (65, 74), the outer wall surface of the needle mounting portion (63) is gradually reduced in diameter toward its end in a tapered surface, a base needle (72) of the needle tube (71) is perforated through from the end of the small hole (64) of the needle mounting portion (63) to the housing recess (61), so that said base needle (72) is gas-tightly secured to the small hole (64) of the needle mounting portion (63), a needle hole (73) perforated through said needle tube (71) is connected to said housing recess (61), an end needle (75) of said needle tube (71) is provided to protrude from the needle mounting portion (63), the cap (65, 74) acts as a needle guard, a length (K) of a hollow section of said needle guard (74) is set longer than a total length (J) of the length of said end needle (75) and the length of the needle mounting portion (63), an inner wall of said needle guard (65, 74) is formed in the same tapered surface as the tapered surface of the needle mounting portion (63), and the end needle (75) is sealed in the hollow section of said needle guard (65, 74).

Claim 8

The dual chamber prefillable syringe according to claim 6, wherein said dual chamber prefillable syringe further comprises a lure lock (86) having a columnar portion (85), the lure lock (86) is suspended from the outer surface (62) of the housing bottom (55), the columnar portion (85) includes the needle mounting portion (63) therein, female threads (88) are formed on an inner peripheral surface of the columnar portion (85), a flange (80) is formed on an outer wall surface of the cap (65), and the flange (80) is engaged by the female thread (88) with said lure lock (86).