| 摘要 |
A disposable syringe and a push rod (3) for use in the disposable syringe. The push rod (3) comprises a proximal end (11), a distal end (10) and an axis (12) extending through the proximal end (11) and the distal end (10). The distal end (10) of the push rod (3) is provided with a snap- fitting mechanism (14) and a stop flange (13) located at a proximal side of the snap -fitting mechanism (14). The stop flange (13) comprises a main body portion (15) formed about the axis (12) of the push rod (3) and a plurality of finger portions extending from the main body portion (15) in a direction away from the axis (12) of the push rod (3). A smaller push force continues to be applied to the push rod (3) upon completion of injection , thereby achieving an additional stroke needed when the distal end (10) of the push rod (3) snap -fits with a needle seat (2) and lessening patient 's pains. |
