| 摘要 |
<p>INTERCHANGEABLE HYPODERMIC NEEDLE ASSEMBLAGE An interchangeable needle assemblage for a hypodermic syringe which enables needles of varying lengths and characteristics to be readily attached to the barrel of an existing syringe or vial. The barrel has an opening with a sealing membrane disposed thereacross, adapted to be pierced by the inner end of the needle. Carried on the barrel is a locking type ferrule having a pair of internal locking shoulders located on opposite sides of a slot. A needle hub assembly is receivable in the slot, being rigidly affixed to the needle at a point intermediate the ends thereof, said assembly having finger-engageable ears to facilitate grasping of the hub, and further having shoulders cooperable with the locking shoulders on the ferrule. To install a needle on the syringe or vial, the hub is first inserted into the ferrule so that the hub shoulders by-pass the internal locking shoulders of the ferrule. The hub is then turned to cause engagement between the said cooperable shoulders, thus securing the needle in place. During insertion of the needle and hub into the ferrule, the inner end of the needle pierces the sealing membrane and communicates with the interior of the syringe barrel or vial, thus readying the item for use.</p> |
