A retractable needle assembly includes a housing having a sidewall defining a hollow bore, and an elongate plunger, the distal end of the plunger forming a reservoir within the hollow bore for containing a fluid therein. The plunger is adapted for slideable movement within the hollow bore. The assembly includes a hub disposed within the hollow bore and at least partially supporting a cannula therewith, and a needle retraction member engaged with the hub for manually selectable advancement with respect to a portion of the housing. The needle retraction member may be advanced from an initial position in which at least a portion of the needle is disposed outside the housing, to a retracted position in which the needle is fully surrounded by the housing. The elongate plunger may be advanced about the hub for extracting the fluid into the reservoir or expelling the fluid from the reservoir.

A syringe assembly includes a syringe body, needle assembly, retaining clip, gasket, needle latch, and needle hub. The syringe body has a syringe interior, longitudinal axis, proximal and distal ends, and needle attachment interface disposed at the distal end thereof. The gasket is configured to be compressed to provide a liquid-tight seal around an outer diameter of the needle assembly and the distal end of the syringe body. The needle latch assembly includes first and second latching tabs configured to retain the needle assembly in a close state and to be plastically deformed to an open state to release the needle assembly, and a gasket backstop configured to provide a flat surface for compression of the gasket, where the first and second latching tabs are spaced apart from the gasket such that neither of the first and second latching tabs contact the gasket during compression of the gasket.

A retractable needle assembly includes a housing having a sidewall defining a hollow bore, and an elongate plunger, the distal end of the plunger forming a reservoir within the hollow bore for containing a fluid therein. The plunger is adapted for slideable movement within the hollow bore. The assembly includes a hub disposed within the hollow bore and at least partially supporting a cannula therewith, and a needle retraction member engaged with the hub for manually selectable advancement with respect to a portion of the housing. The needle retraction member may be advanced from an initial position in which at least a portion of the needle is disposed outside the housing, to a retracted position in which the needle is fully surrounded by the housing. The elongate plunger may be advanced about the hub for extracting the fluid into the reservoir or expelling the fluid from the reservoir.

A syringe assembly includes a syringe body, needle assembly, retaining clip, gasket, needle latch, and needle hub. The syringe body has a syringe interior, longitudinal axis, proximal and distal ends, and needle attachment interface disposed at the distal end thereof. The gasket is configured to be compressed to provide a liquid-tight seal around an outer diameter of the needle assembly and the distal end of the syringe body. The needle latch assembly includes first and second latching tabs configured to retain the needle assembly in a close state and to be plastically deformed to an open state to release the needle assembly, and a gasket backstop configured to provide a flat surface for compression of the gasket, where the first and second latching tabs are spaced apart from the gasket such that neither of the first and second latching tabs contact the gasket during compression of the gasket.

A medical device for percutaneous or venous access for the purposes of administering a fluid to a patient or sampling from one is disclosed. The device includes a cannula holder that has a part or portion of cross-section which is reduced or different from its distal end and proximal end. The part or portion of reduced or different cross-section allows the cannula holder to deform within the body of the device when activating means are activated to separate the cannula holder from an immobilising member allowing the cannula holder to move in the body of the device and re-enter and disappear within such body of the cannula.

A pen needle assembly (10) includes a pen needle (12) with a hub body (16) having a needle shield (28) that covers a needle (26) and can be retracted to expose the needle during injection and return to the extended position after use and locked in the extended position. A spring (56) is provided to rotate the needle shield after use to a locked position. A locking member (84) can be provided on the needle shield that cooperates with the hub body (16) to prevent rotation after use. An attachment mechanism (38) for the pen needle provides a sensory indication when a needle-bearing hub body (16) is seated on a pen and limits further rotation of the pen needle relative to the delivery device.

A medical device for percutaneous or venous access for the purposes of administering a fluid to a patient or sampling from one is disclosed. The device includes a cannula holder that has a part or portion of cross-section which is reduced or different from its distal end and proximal end. The part or portion of reduced or different cross-section allows cannula holder to deform within the body of the device when activating means are activated to separate the cannula holder from an immobilising member allowing the cannula holder to move in the body of the device and re-enter and disappear within such body of the cannula.

A fluid delivery injector comprises a syringe defining a barrel; a plunger and a hollow needle provided within the barrel adapted for linear movement parallel to a longitudinal axis with a distal tip of the needle contained within the syringe. A fluid retention reservoir is defined at least in the barrel and is in fluid communication with the needle when pressure is applied to the fluid in the reservoir and to the plunger for moving the needle out of the barrel. A spring may be provided for retracting the needle when pressure is released from the plunger.

A retractable needle assembly (1) is disclosed comprising a body portion (10); a needle (50) having a forward end (52) and being movable between an operable orientation in which the forward end projects forwardly from the body portion, and a safe orientation in which said forward end (52) is retracted into the body portion (50). The needle assembly further comprises a deflector (70) mounted in the body portion (50), which is moveable between a first position and a second position, wherein the movement of the deflector (70) between its first and second position urges the needle into its safe orientation, the deflector being biased towards the second position; a latching mechanism which holds the deflector in the first position; and an actuator (90), operable to release the latching mechanism.

The devices and methods described herein relate to injector devices for delivering payloads to a tissue.