| 摘要 |
A disposable syringe assembly generally including a cylinder assembly 10, a needle assembly 20, a piston assembly 30, a seal cap assembly 40, a piston stem 50 and handle 60. The cylinder assembly 10 may be engaged with the needle assembly 20 substantially near the needle end of the cylinder assembly 10 and the cylinder assembly may be engaged with the seal cap assembly 40 near the seal cap end of the cylinder assembly 10. The cylinder assembly 10 may further including a fluid region 14 and an air region 15. As fluid is drawn into the fluid region 14 by movement of the piston assembly 30, air is displaced from the air region 15 through a one-way valve. As fluid is discharged from the cylinder assembly 10, a low pressure is created in the air region 15. When substantially all fluid is discharged from the cylinder assembly, a connector on the piston assembly 30 may engage a connector on the needle assembly 20, and the needle assembly 20 may be disengaged from the cylinder assembly 10 and the needle assembly 20 may be retracted into the cylinder assembly 10.
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