Patent ID: 6527751
Filing Date: 2003-03-04
Classification: A61M

Abstract:
A syringe comprising:a syringe barrel having an interior surface bounding a chamber, the chamber extending from a first end to an opposing second end; a manual plunger coupled with the syringe barrel so as to selectively advance within the first end of the chamber; at least a portion of a hydraulic plunger slidably disposed within the second end of the chamber, the hydraulic plunger including: a piston body; and a shaft projecting from the piston body, the shaft selectively extending through an opening formed at the second end of the chamber; and a first seal coupled with the piston body and producing a liquid tight seal with the interior surface of the syringe barrel; a hydraulic fluid sealably disposed within the chamber of the syringe barrel, at least a portion of the hydraulic fluid being disposed between the manual plunger and the hydraulic plunger such that as the manual plunger is selectively advanced within the chamber, the hydraulic fluid advances the hydraulic plunger within the chamber; and means operably connected to the manual plunger for mechanically retracting the hydraulic plunger when the manual plunger is retracted.