Abstract: A retractable needle assembly for use in medical procedures, comprising: a needle assembly including a hub, a hollow needle passing through the hub and projecting from the posterior end of the hub, and a tubular sleeve having a radially directed hole therethrough connected with the anterior end of the hub; a tubular sheath having a wall with a radially directed hole therethrough, wherein the needle assembly is positioned within the tubular sheath so that it may be moved reversibly between an exposed position and a retracted position; a means for reversibly locking the needle assembly in its exposed position; a means for reversibly locking the needle assembly in its retracted position; and a means for permanently locking the needle assembly in its retracted position, said permanent locking means comprising a radially-directed peg mounted on an exterior surface of the tubular sheath so that one end of the radially-directed peg is adapted to be pushed inwardly through the hole in the wall of the tubular she

Abstract: A retractable syringe needle comprising a needle assembly including: a needle-holding mechanism comprising a hub and an annular sleeve connected with said hub; a hypodermic needle extending through said hub; and a pin directly connected to the exterior surface of said annular sleeve; a container having a tubular wall with a longitudinal slot therein, said container having a first open end adapted to receive a syringe barrel and a second open end adapted to admit a syringe needle, said container having said needle assembly mounted therein so that the pin is slidably engaged by the longitudinal slot, so that said needle assembly may be moved from a first position where the needle is within the container to a second position where the needle is exposed by sliding the pin toward the second open end of the container and causing the needle to pass through the second open end; a means for biasing the needle assembly toward said first position; and a means for releasably engaging the pin at a defined location in said

Abstract: 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.

Abstract: A retractable syringe needle featuring an adjustable-length tube having a first end and a second end. The adjustable-length tube has a length which may be reversibly altered from a first contracted length to a second extended length. A syringe barrel may be secured to the first end of the adjustable length tube, and a cylindrical hub having a hollow hypodermic needle attached thereto may be secured to the second end of the adjustable-length tube. A tubular sheath is disposed around the adjustable-length tube. The tubular sheath has a first end which is rigidly connected with the first end of the adjustable-length tube and a second end having an open which is sufficiently large to allow the end of the hypodermic needle to pass therethrough. The length of the adjustable-length tube may be altered from the contracted length to the extended length. When the adjustable-length tube is contracted, the hypodermic needle is entirely disposed within the sheath.

Abstract: A retractable syringe needle, including a needle assembly featuring a needle-holding mechanism containing a hub and a means for securing a syringe barrel to the hub, a hypodermic needle extending through the hub; and a pin connected with said hub. The needle assembly is positioned inside a tubular container which has a tubular wall with a first longitudinal slot therein. The container has a first end adapted to receive a syringe barrel, and a second open end adapted to receive a syringe needle. The needle assembly is slidably mounted in the container so that the first longitudinal slot slidably engages the pin. The needle assembly may be moved from a first position where the needle is within the container to a second position where the needle is exposed by sliding the pin toward the second open end of the container and causing the needle to pass through the second open end.