A needle hub assembly for a pen needle includes a needle hub, a cannula or needle coupled to the needle hub, a retractable and compressible sleeve covering at least one end of the cannula, and an outer cover. The outer cover encloses the needle hub and the retractable sleeve. The retractable sleeve is coupled to the hub to cover the end of the cannula where the sleeve can pass through or can be pierced by the cannula and the sleeve retracts axially on the cannula. The sleeve is resilient and returns to an original configuration when an insertion force is released. The needle hub can have a first sleeve to cover a patient end of the cannula, and second sleeve to cover a non-patient end of the cannula where the sleeves retract onto the cannula or hub and expand to the original configuration to cover the ends of the cannula.

A medical device having a frontal attachment and a connector housing having or attachable to an associated medical apparatus, the frontal attachment slidably engaging the connector housing and having a forwardly projecting, rearwardly biased needle and a needle retraction assembly, and the connector housing having a needle retraction cavity laterally offset from the needle in a first position, the needle retraction cavity being selectively movable relative to the frontal attachment following use to reposition the needle retraction cavity into alignment with the needle to permit retraction.

One embodiment is directed to a method for safe injection, comprising: providing an injection assembly and inserting a plunger tip of the injection assembly to a final insertion state and releasing an associated manual insertion load. A retraction load developed sufficient to cause the plunger tip to be proximally withdrawn pulls the retractable needle proximally relative to the needle housing to a retracted state wherein a distal tip of the needle becomes mechanically locked into an encapsulated configuration wherein it is no longer exposed for injection.

Disclosed is a Huber needle assembly that may include an upper body connected to a lower body, the assembly being structured to retain a needle for insertion/extraction of the needle into/from an insertion site. The upper body can statically retain the needle while the lower body may slidably receive the needle. The lower body can further include a catch that engages a tip of the needle and/or misaligns the tip of the needle with a needle aperture of the lower body to place the assembly in a safety-lock position, preventing rebound, needle-stick injury, and/or any type of exposure of the needle tip to an environment outside of the lower body. The assembly can further bias the needle in a direction so as to prevent re-emergence of the needle tip after being withdrawn into the lower body.

Barrel adapters for safety syringes include a barrel and a plunger assembly adapted to move within the barrel, a barrel tip adapted to be sealingly engaged with a distal end of the barrel and a needle retraction mechanism barrel having a needle subassembly and an actuator subassembly. The needle subassembly includes a needle, and a needle-over-mold (NOM) through which the needle extends. The needle subassembly is disposed at least partially within the barrel tip, and adapted to move from an injection position in which the needle extends from a distal end of the barrel tip to a retracted position in which the needle is disposed within at least one of the barrel tip or the barrel. The actuator subassembly includes a needle seal, a push-bar, and an actuator surface. The needle retraction mechanism barrel includes a biasing member and an actuable locking arrangement. A syringe includes such barrel adapters.

A system for serially injecting liquids includes a syringe body defining a syringe proximal opening and a distal needle interface, proximal and distal stopper members, forming proximal and distal chambers. The system also includes a first liquid in the distal chamber and a second liquid in the proximal chamber, and a plunger configured to be manually manipulated to insert the proximal stopper member distally. Moreover, the system includes a needle hub assembly coupled to the syringe body, the needle assembly including a needle. The needle defines a needle interior, and distal, middle and proximal openings. The distal, middle and proximal openings are fluidly coupled through the needle interior. Manipulating the plunger member to insert the proximal stopper member initially expels the first liquid from the distal chamber, then serially expels the second liquid from the proximal chamber.

A syringe is provided, including a syringe barrel, a needle set and a push rod. A front end part is provided in the syringe barrel. An end of the needle set has an open area, the open area is transversely provided with a first snap part. The push rod is slidably disposed within the syringe barrel, and an end of the push rod facing the front end part has a second snap part. When the push rod is slidingly moved to the front end part, the second snap part is engaged with the first snap part.

A needle tip shielding device, comprising a base plate with a hole extending there through from the proximal side of the base plate to the distal side of the base plate, and at least one resilient arm extending at an attachment point at said base plate (101) is provided. The resilient arm has a resting state wherein a distal hook of the resilient arm will coincide with a straight imaginary line extending longitudinally through said hole in the axial direction of said base plate. The resilient arm comprises a knob at its distal end, said knob extending laterally from the resilient arm. The knob is shaped with an outer curvature in the transversal plane around an axis parallel to the central axis of the needle tip shielding device and said knob is shaped with an outer curvature in the midsaggital plane around an axis perpendicular to the central axis of the needle tip shielding device.

A combination plunger, a mixing device and a mixing syringe including the same are provided. The mixing syringe includes concentric outer and inner barrels that form an outer chamber, the inner barrel having an inner chamber. The combination plunger includes a mixing plunger and a delivery plunger and a biasing means. The mixing plunger is slidably located in the outer chamber and translated by coordinated depression of the delivery plunger to transfer a first substance from the outer chamber to mix with a second substance in the inner chamber. After the mixing stage is complete, the delivery plunger is disengaged from the mixing plunger and permitted, such as by rotation, to be further depressed in the axial direction to deliver fluid contents of the mixing syringe to a recipient. The mixing syringe needle is then retracted as result of engagement by the delivery plunger and activation of the biasing means.

A fluid injector including an injector housing with at least one syringe port for receiving a syringe, and a locking mechanism associated with the at least one syringe port for securing the syringe within the at least one syringe port. The locking mechanism is configured for engaging at least one syringe retaining member of the syringe to releasably lock the syringe within the at least one syringe port. The at least one syringe retaining member rotationally guides the syringe into self-orienting alignment with the locking mechanism and is rotated by the locking mechanism into fully locked position after axial installation of the syringe into the at least one syringe port. The locking mechanism also axially ejects the syringe from the locking mechanism upon rotation of the syringe during removal.