A modular retractable needle assembly having a unitary propellant release structure is provided. The modular retractable needle assembly can be coupled to a suitable syringe. A modular filler needle can be provided that is engageable to the syringe. Kits comprising the modular retractable needle assembly, one or more syringes, and a modular filler needle are provided.

Provided are an intradermal needle having a protector that is movable from an open position near a needle hub to a closed position where a needle tip is covered, a packaged article, and an injection device. The protector has an arm that is supported in a freely pivotable manner by an axle pin positioned on the base end side of the wide diameter part of the intradermal needle, and a lid supported by the arm. With the axle of pivoting of the protector positioned near the needle hub, the lid may be housed compactly near the needle hub when the protector is in the open position.

A pain-reducing injection apparatus to enhance the safety, efficacy, and efficiency of injection procedures which utilize topical pain-reducing measures. Apparatuses and methods of use provide pain reduction through thermal cooling of an injection region or vibrating the region or both, and optionally include safety shielding and lockout features.

A needle assembly (1) comprising a needle unit (2), where the needle unit (2) comprises a hub (6) with a skirt (3) having a longitudinal central axis (A), where the skirt (3) is having a proximal (7) and a distal end (8). The skirt is also having an internal surface adapted to interface with a mounting portion of a drug delivery device. The needle unit further comprises a needle cannula (30) having a proximal (31) and a distal (32) end, a central hub portion (5) holding the needle cannula (30), a transition portion (4) attached to the skirt portion (3), and wherein the transition portion (4) connects the skirt (3) with the central hub portion (5). The needle unit (2) is adapted to be switched between a retracted mode and an ejected mode. In the retracted mode, the distal end (32) of the needle cannula (30) is in a position which is proximal to the distal end (8) of the skirt (3), and the needle cannula (30) may be safely accommodated within the skirt (3). In the ejected mode, the distal end (32) of the needle cannula (30) is in a position which is distal to the distal end (8) of the skirt (3), and the needle cannula (30) may be ready for insertion. The transition portion (4) is adapted to deform, and thereby enable the switching between the modes, by allowing the central hub portion (5) to be moved in a longitudinal direction.

Embodiments of a retractable syringe assembly are provided that include a dual syringe barrel configuration. One or more embodiments include reuse prevention features and features that prevent premature activation of the retraction mechanism. Methods for aspirating and expelling liquid from medical devices are also provided.

The invention provides a safety injector needle. The safety injector needle includes a needle seat, an injection needle axially fixedly connected to the needle seat, and a trigger protection assembly assembled on the needle seat, the needle seat includes an assembly part and a fixing part; the trigger protection assembly includes a case, a trigger mechanism and an elastic element; the case is arranged in a hollow tube shape; the trigger mechanism includes a first trigger mechanism and a second trigger mechanism. The first trigger mechanism can slide along the extension direction of the case under the action of the elastic element.; the second trigger mechanism can slide along the extension direction of the needle seat under the action of the elastic element, so that the injection needle is completely contained between the trigger mechanism and the needle seat after the safety injector needle is used.

A safety syringe for medical use having an injection molded plastic body with a tubular barrel, a transverse finger flange surrounding the barrel and two upwardly projecting wings with substantially flat, outwardly facing surfaces disposed forwardly of the finger flange, a plunger assembly slidably engaging an inside wall of the barrel, a needle with a tip projecting forwardly from the barrel, and a needle safety shield slidably engaging the body between the wings, wherein the transverse finger flange has a window that allows core pin insertion through the window during injection molding of the body, the plunger assembly has a proximal end cap that is integral with the plunger handle and abuts a rearwardly facing surface of the transverse finger flange, and the needle safety shield has a distal end with a cylindrical needle guard that is forwardly movable following use of the syringe to guard the needle tip.

A fluid injector system for delivering a multi-phase fluid injection to a patient and methods of fluid delivery is disclosed. Methods of creating and using a multi-aspect fluid path impedance model of the injector system are used. Modeling and adjustment of factors that affect impedance and prevent or reduce backflow, reduce the likelihood of fluid flow rate spikes and provide more accurate flow rates and mixing ratios of fluids may be repeated or happen essentially continuously during an injection. The adjustments may be determined before the injection or determined and/or adjusted during the injection. The determination may include sensor feedback commonly used in injectors such as pressure and position feedback as well as other sensors. In all cases, the user can be notified of adjustments through on-screen notices and/or through the recordation of the injection data by a control device of the injector at the conclusion of the injection.

A pneumatically activated retractable-needle syringe comprising a syringe barrel, a plunger, a needle, a needle hub, a locking tip, a propellant gas release cell and a rupture mechanism is provided. The plunger is slidably disposed within and sealingly engaged with the syringe barrel, the plunger having a retraction lumen defined for receiving a needle when the retractable-needle syringe is actuated. The needle is coupled to a distal end of the syringe barrel and in fluid communication with a medicament chamber defined within the syringe barrel distally of the plunger. The needle hub is for securing the needle at the distal end of the syringe barrel, the needle hub being initially secured within a false wall against a loading force or an injection force applied by a user, and releasable from the false wall in response to a post-injection force applied by a user. The locking tip is provided at a distal end of the plunger, the locking tip being in sealing engagement with and initially secured within the retraction lumen against a loading force or an injection force applied by a user, and releasable for sliding retraction within the plunger lumen in response to release of propellant upon a post-injection force applied by a user, the locking tip being engageable with the needle hub in response to the post-injection force to provide a retraction assembly comprising the locking tip, the needle header, and the needle. The propellant release cell is positioned distally of the needle hub and contains a propellant. The rupture mechanism is positioned to puncture the propellant release cell in response to the application of the post-injection force by a user to thereby drive retraction of the retraction assembly within the retraction lumen.

Embodiments of a retractable syringe assembly are provided that include a dual syringe barrel configuration. One or more embodiments include reuse prevention features and features that prevent premature activation of the retraction mechanism. Methods for aspirating and expelling liquid from medical devices are also provided.