An aspiration and injection device is provided that can allow for ergonomic, safe, and precise aspiration of a target site and ejection of a medicament to the target site. The device can include a syringe barrel, a flange extender couplable to the barrel, and plunger that can be engaged by a hand and/or one or more finger of a user to perform aspiration and injection at a target site.

A space in a muscle wall such as the inguinal canal is dilated by a plunger-based mechanism to break up fibrotic bands by divulsion. While the space is dilated a dynamic plug is advanced into it, with the plug expanding and contracting with the space.

An dual-dose syringe system is an apparatus that includes a tubular housing and a plunger. The tubular housing attaches onto a variety of syringe and needle assemblies and mounts the plunger within the syringe. The tubular housing prevents the plunger from simply traversing into the syringe. The tubular housing includes a first lateral-half portion and a second lateral half-portion that snaps onto each other and encloses a syringe. The tubular housing further includes a key slot that engages the plunger. The plunger includes a plurality of cross bars that predetermine two doses. Each of the plurality of cross bars is positioned perpendicular to a corresponding adjacent bar, forcing a user to purposefully twist the plunger in order to administer a dose. The apparatus further includes at least one spring-loaded barb that prevents the reuse of the apparatus.

Automatically-locking syringes are disclosed herein. A syringe in accordance with embodiments of the present technology can include (i) a barrel, (ii) a plunger slidably positioned within the barrel, and (iii) a lock plate coupled to the barrel. The plunger also extends through an opening in the lock plate, and a biasing member is configured to bias the lock plate to a locking position. When the plunger is moved from a depressed position to a withdrawn position, the lock feature engages the lock plate to drive the lock plate away from the locking position to thereby permit the lock feature to pass through the opening in the lock plate. After the lock feature passes through the opening, the biasing member drives the lock plate to the locking position to inhibit movement of the plunger from the withdrawn position to the depressed position.

A medical injection device, including: a medication container having a mov-able piston; a push rod assembly displaceably disposed in the medical injection device, the push rod assembly having a plurality of spaced-apart position setting means disposed along the length thereof, the push rod assembly selectively displacing the movable piston to dispense medicament from the medication container; a spring to bias the push rod assembly to move toward the distal end of the medical injection device; a releasable restraining means configured to releasably restrain the push rod assembly in a locked state against the biasing of the spring, wherein, upon release of the releasable restraining means, the push rod assembly moves under force of the spring toward the distal end of the medical injection device; and an arming means configured to move the push rod assembly toward the proximal end of the medical injection device.

The invention provides a syringe for use in an ophthalmic injection. The syringe comprises a body, a stopper and a plunger. The body comprises an outlet at an outlet end and the stopper is arranged within the body such that a front surface of the stopper and the body define a variable volume chamber from which a fluid can be expelled though the outlet. The plunger comprises a plunger contact surface at a first end and a rod extends between the plunger contact surface and a rear portion. The plunger contact surface is arranged to contact the stopper but not couple thereto, such that the plunger can be used to force the stopper towards the outlet end of the body, reducing the volume of the variable volume chamber, but not to move the stopper away from the outlet end.

An autoinjector having a reservoir (110); a piston (111); a needle (112); a driver module having a body (201); a piston rod (210) movable between rest position and injection positions; an injection spring (220); and a lock that blocks the piston rod in its rest position. The lock ha a thread (230) connected to the piston rod and to a toothed winder wheel (240), a locking member (260) co-operating with a tooth (241) of the toothed winder wheel, the locking member (260) movable between a blocking position preventing the winder wheel from turning in the direction of actuation force (Fa) exerted by the injection spring, and an actuated position allowing turning of the winder wheel. The autoinjector includes a re-cocking mechanism (400) for rewinding the thread on the winder wheel by turning the winder wheel in the opposite direction to its direction during the injection stage.

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.

An injection assembly includes a housing with a barrel positioned within the housing. The barrel includes an axis extending from a proximal end to a distal end thereof and a chamber for storing medicine. An elongate anti-rotation shaft is rotationally fixed to the housing and has a non-circular cross-section. The injection assembly includes an inner screw having an inner screw opening to complementarily receive the anti-rotation shaft to prevent rotation of the inner screw with respect to the anti-rotation shaft but allow respective linear translation along the axis. An outer screw is positioned within, and rotatable with respect to, the housing and has an outer screw opening to threadably receive the inner screw, wherein rotation of the outer screw translates the inner screw along the axis and along the anti-rotation shaft. A plunger is coupled to the distal end of the inner screw and is moveable with respect to the chamber to push the medicine out of the chamber when the outer screw is rotated.

An injection device comprises a syringe extendible against a spring bias from a retracted position in a housing to a projecting injecting position. A spring biased plunger has collapsible elbows which, when the plunger is released, initially engage the end of the syringe to drive it to the projecting position, whereupon arresting of the syringe movement causes the elbows to collapse inside the syringe to allow the plunger to engage and drive the bung.