Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-12-06
1998-11-03
Stright, Jr., Ronald K.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604218, 604240, 604242, 604 90, A61M 500
Patent
active
058301933
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a kit style syringe having a syringe cylinder which is previously filled with medicine, and more particularly to an improved sealing arrangement which prevents invasion of bacteria and vapor during storage and sterilization.
BACKGROUND ART
Japanese Patent Publn. No. 62-58745 disclose a kit style syringe which, as shown in FIG. 23 can be previously filled with medicine and permits injection to be easily performed by only attaching a syringe needle. As shown in FIG. 23, a syringe 63 includes a glass cylinder body 64, a barrel 65 of synthetic resin fixedly fit into the front of the cylinder body 64, and a cap 70 of synthetic resin mounted on a syringe needle connection portion 69 at the tip of the barrel 65. A slidable partition stopper 66, a piston 67 and a medicine solution 68 filled therebetween are arranged in the cylinder body 64. The barrel 65 and cylinder 64 constitute a syringe cylinder.
The barrel 65 has an inner diameter equal to that of the cylinder body 64. On the inner wall of the barrel 65 are formed a longitudinal groove 71 and a delivery groove 72 extending from the groove 71 to a discharge hole 73 of the needle connection portion 69. In operation, when a piston 67 is pushed, the partition stopper 66 moves into the barrel 65. The medicine 68 is then introduced into the discharge hole 73 through the grooves 71 and 72. A syringe needle is lure-locked with the needle connection portion 69 which is tapered, i.e., surely fixed there by elasticity peculiar to the resin from which the needle connection portion 69 is made.
The cap 70 is fixedly fitted on an external cylinder 74 formed around the needle connection portion 69 of the barrel 65 as seen in the enlarged view shown FIG. 23. Specifically, a peripheral groove 75 is formed on the side of the inner wall of the external cylinder 74. A protrusion 78 of a circular engagement hem 77 extending from a flange of the cap 70 is engaged with the peripheral groove 75 so that the flange 76 intimately abuts against the external cylinder 74. The cap 70 serves to prevent the invasion of dust during safekeeping.
However, the syringe 63 described above can inject only one kind of medicine. Where two or more kinds of injection agents or medicines, e.g., agents A and B should be mixedly injected, these two kinds of injection agents must be mixed previously. In this case, even where the agents A and B exist solely, respectively, and can be stably preserved for a long time, it may be difficult to maintain the stability in the mixed state of A+B.
A syringe which permits two kinds of medicines to be separately preserved has been proposed in Japanese Utility Mode Preliminary Publn. 3-58434. This syringe (not shown) has a structure similar to that explained above in connection with the above Japanese Patent Publn. 62-58745, in which another partition stopper is arranged between the partition stopper 66 and the piston 67 to permit two kinds of injection agents to be accommodated. This syringe, in which the shape of a passage in the barrel is slightly modified, has basically the same structure as that of the syringe disclosed in FIG. 23.
In any syringe described above, however, the barrel 65 must be fabricated as a separate component and attached to the tip of the cylinder 64. Such a syringe is too expensive to manufacture because the structure of the barrel is complicated and requires high accuracy.
Meanwhile, filling of medicine solution and insertion of partition stoppers in the syringe are carried out by the vacuum filling/stopping technique shown in FIGS. 24(a) and 24(b). In this technique, first, as shown in FIG. 24(a), a front partition stopper 37.sub.1 is inserted into the front of the cylinder 36 and thereafter the first medicine solution 42 is injected from a solution nozzle 38. In this case, the interior of the cylinder 36 is evacuated to prevent mixing of air in the medicine solution 42.
Next, as shown in FIG. 24(b), a partition stopper 37 pushed into a metallic cylindrical tube 39 by reducing its diameter i
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