| 摘要 |
<p>Disclosed is a hypodermic injection device wherein the needle can be retracted into the reservoir chamber, after use, for disposal. The device includes a plunger (1) having a needle-retention chamber (6) in the end of the plunger closest to the needle structure. The end portion of the needle (3) can be resilient, and shaped (7), such that the end of the needle can be retained in the needle-retention chamber when the plunger reaches the end of its stroke toward the needle. Other structures for ensuring retention of the needle in the needle-retention chamber are also disclosed. Also disclosed is structure for ensuring that the needle cannot be relocated for re-use, once it has been withdrawn into the reservoir chamber, and structure avoiding accidental retention of the needle in the needle-retention chamber.</p> |
