| 摘要 |
A syringe in accordance with the invention comprises a cylinder 10 having a smooth, substantially hemi-spherical end 12 with a centrally placed hole 14 for dispensing the contents of the syringe. The plunger may have an annular rim 22 close to its inner end, which is arranged to engage with a corresponding annular slot 28 formed in the inner wall of the cylinder when the syringe is in its filled state. The rim 22 not only holds the plunger 16 in position prior to use, but also acts to prevent leakage of the contents. As the plunger 16 is depressed the rim 22 also acts to provide 10 a tight seal between the piston and the cylinder. The cylinder has a second internal slot or groove 30 close to its domed end 12. When the plunger reaches the end of its travel the rim 22 engages tightly with the second annular slot 30 in order to prevent the piston being pulled out again for re-use of the syringe. The syringe is arranged so that it can be supplied filled with a suitable lubricant with its plunger ready for use without further manipulation. |
