| 摘要 |
A retractable needle for use with a catheter, featuring a cylindrical hub having a hollow needle extending through the hub. The hub has a flash chamber connected thereto where the interior of the needle is in fluid communication with the interior of the flash chamber. The hub is slidably positioned in a housing having a wall with a longitudinal slot therein. A stem connected with the hub passes through the slot, and has a thumbrest rigidly fixed thereto, where the thumbrest may be used to manually move the knob from a first locking position, where the needle is retracted within the housing, to a second locking position where the needle is exposed. A catheter is mounted on the needle when the needle is exposed. Also disclosed are blood-drawing needles comprising a cylindrical hub having a hollow needle extending from one end of the hub. The hub has a cavity adapted to frictionally engage the tip of a syringe barrel on its other end. The hub is slidably positioned in a housing having a wall with a longitudinal slot therein. A stem connected with the hub passes through the slot, and has a thumbrest rigidly fixed thereto, where the thumbrest may be used to manually move the knob from a first locking position, where the needle is retracted within the housing, to a second locking position where the needle is exposed.
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