| 摘要 |
A syringe of improved ergonomics having an ellipsoidal barrel which contains an ellipsoidal plunger. The plunger consists of: a plunger tip of a rigid, non-elastomeric material which interfaces a medical fluid contained in the syringe barrel; and an elastomeric ring which slideably interfaces the inside wall of the syringe barrel. In one embodiment the plunger contains a plastic plunger insert which supports the elastomeric ring, the interior of which is provided with an ellipsoidal cavity. A self-aligning plunger rod having a ball portion on its distal end is inserted into the cavity of the plunger insert. The ball portion freely moves in the cavity and directs the external force exerted on the plunger rod in an axial direction. |
