| 摘要 |
A disposable syringe includes a barrel having a retaining region to retain a needle seat for carrying a needle cannula, and a friction diminishing region extending forwardly from the retaining region and terminating at a shoulder abutment, a plunger movable in the barrel toward the needle seat, and a coupling member biased by a biasing member and having a retained portion to frictionally engage the plunger, and an anchored portion to engage an anchoring portion of the needle seat such that when the needle seat is moved past the friction diminishing region to abut against the shoulder abutment, a subsequent pushing force applied to the plunger results in release of the retained portion from the plunger, thereby enabling the anchored portion to be moved into the plunger by means of the biasing member.
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