Abstract: 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 has a retraction lumen defined therein for receiving the needle when the retractable-needle syringe is actuated.

Abstract: 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.

Abstract: Blood collection devices having a retractable needle are provided. Activation of the retraction mechanism causes release of propellant from a propellant chamber, which drives a retraction assembly carrying the needle into a body of the device.

Abstract: A gas release cell for use with pneumatically actuated sharps-containing medical devices. The gas release cell has a rigid outer shell and a sealing membrane sealingly engaged with the rigid outer shell. A compressed propellant is retained within the gas release cell by the sealing membrane, and the sealing membrane is rupturable to actuate the medical device by releasing compressed propellant from the gas release cell.

Abstract: Blood collection devices having a retractable needle are provided. Activation of the retraction mechanism causes release of propellant from a propellant chamber, which drives a retraction assembly carrying the needle into a body of the device.

Abstract: 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.

Abstract: 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.

Abstract: A gas release cell for use with pneumatically actuated sharps-containing medical devices. The gas release cell has a rigid outer shell and a sealing membrane sealingly engaged with the rigid outer shell. A compressed propellant is retained within the gas release cell by the sealing membrane, and the sealing membrane is rupturable to actuate the medical device by releasing compressed propellant from the gas release cell.