Retrax, Inc.

Other

Frederick G Bright

Walter W Gloyer

A retractable syringe includes a barrel, one end of which comprises a mounting collar. A needle carrier is releasably mounted within the collar, and releasably supports a needle cartridge. A hypodermic needle is mounted within the cartridge. A sheath attaches at one end to the cartridge, and at the other end to the collar. A plunger is telescoped into the barrel, and includes a relatively hard piston sealingly engaging the barrel. The piston includes a latch for engaging the carrier and releasing it from the collar. A pocket in the carrier has a support member in its center, and a pair of helical ribs for threadingly engaging a pair of tabs on the cartridge. The cartridge sealingly receives the support member. The collar has slots and inclined threads in its bore wall for engaging lugs on the carrier. The inclined threads have a friction bump near their blind ends. A retaining pin prevents relative rotation between the carrier and collar prior to desired retraction of the needle into the barrel. Alternative embodiments include a barrel which may be resilient or non-resilient and a hard or soft resilient piston, respectively, having a plunger head secured therewithin and attached to the plunger. A latch is attached to the plunger head, and is received in a recess in the carrier to engage latch stops for rotating the carrier to release it from the collar. Alternative embodiments may include means for securing the plunger in the barrel after retraction.

Retractable syringe

A retractable syringe includes a resilient barrel, one end of which comprises a mounting collar. A needle carrier is releasably mounted within the collar, and releasably supports a needle cartridge. A hypodermic needle is mounted within the cartridge. A sheath attaches at one end to the cartridge, and at the other end to the collar. A plunger is telescoped into the barrel, and includes a relatively hard piston sealingly engaging the barrel. The piston includes a latch for engaging the carrier and releasing it from the collar. A pocket in the carrier has a support member in its center, and a pair of helical ribs for threadingly engaging a pair of tabs on the cartridge. The cartridge sealingly receives the support member. The collar has slots and inclined threads in its bore wall for engaging lugs on the carrier. The inclined threads have a friction bump near their blind ends. A retaining pin prevents relative rotation between the carrier and collar prior to desired retraction of the needle into the barrel. An alternative embodiment includes a barrel which may be non-resilient and a soft resilient piston having a plunger head secured therewithin and attached to the plunger. A latch is attached to the plunger head, and is received in a recess in the carrier to engage latch stops for rotating the carrier to release it from the collar. Both embodiments may include means for securing the plunger in the barrel after retraction.

A disposable safe hypodermic syringe. Includes a hollow barrel formed with a support collar at one end to enclose and releaseably latch a needle support member and a hypodermic needle carried by the support member. The barrel is formed at its distal second end to receive an injection piston carried by the plunger member. The plunger head and needle support member cooperate to form a latch for latching the support member to the plunger head, releasing the support member from the support collar, and withdrawing the plunger head, support member, and needle together to a protective position within the barrel. A latch carried by the injection piston and by the second end of the barrel finally latches the injection piston, plunger head, support member, and needle together to a contagion safe position. Two embodiments are disclosed.

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Tomball, TX, United States of America

Frederick G Bright