An apparatus includes a housing, a carrier, and an expandable assembly. The housing defines an opening configured to selectively place a gas chamber of the housing in fluid communication with an exterior volume. The carrier is movably disposed within the housing and is coupled to a medicament container. A proximal surface of the carrier defines a portion of a boundary of the gas chamber. The expandable assembly has a first member and a second member. The first member is coupled to an elastomeric member disposed within the medicament container, and the second member includes a valve portion. The expandable assembly transitions from a collapsed configuration to an expanded configuration when the elastomeric member moves within the medicament container. The valve portion moves relative to the opening when the expandable assembly transitions from the first to the second configuration, placing the gas chamber in fluid communication with the exterior volume.

One embodiment is directed to a safety syringe system, comprising: an off-the-shelf syringe assembly comprising a syringe body and a plunger tip; a needle assembly removably coupleable to the distal end of the syringe body such that medicinal fluid may be transferred through a retractable needle coupled to a needle housing comprising the needle assembly upon insertion of the plunger tip relative to the syringe body; and a plunger control assembly coupled to the plunger tip and configured to facilitate manual insertion of the plunger tip relative to the syringe body; wherein upon insertion of the plunger tip to a final insertion state and release of an associated manual insertion load, the plunger tip may be proximally withdrawn, pulling the retractable needle proximally relative to the needle housing to a safe locked and retracted state wherein it is no longer exposed for injection.

A safety syringe (1) includes a sleeve assembly (10) threadedly secured to a vial (40) containing regular insulin and including an axial channel (12) with a needle assembly (20) placed therein, and two opposite pivot pins (14) formed on an outer surface. The needle assembly (20) includes a needle hub (22) formed on a front end, and a hypodermic needle (23) through the needle hub (22). A protective covering (30) includes two opposite arms (31) pivotably secured to the pivot pins (14), a space (32), a slot (33) parallel to the arms (31) and communicating with the space (32), and at least one lock member (34) at an end of the slot (33). After injection, a clockwise rotation of the protective covering (30) until the lock member (34) passes through the needle hub (22), and the hypodermic needle (23) passes through the slot (33) to conceal in the space (32).

Catheter and needle assemblies with spring-powered retractable needles are described. The assemblies can include a hollow handle, a grip portion, a catheter hub with a catheter, and a needle. The needle can have a first position in which the needle is slidably disposed within the catheter and a second position in which the needle is slidably removed from the catheter and retracted at least in part into the hollow handle. The grip portion can include a trigger portion that activates a spring to move the needle from the first position into the second position. In the second position, a sharp distal point of the needle is shielded by the grip portion to prevent accidental needle sticks.

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.

A syringe and needle assembly includes an elongated hollow barrel, a needle unit, and a plunger assembly. The hollow barrel has a connecting portion. The needle unit is disposed at the connecting portion and has an engaging structure, and the engaging structure is located in the hollow barrel. A plunger rod of the plunger assembly is movably disposed in the hollow barrel and has a pushing portion and an operating portion formed in front and rear ends of the plunger rod respectively, and the pushing portion faces the connecting portion and has a plurality of elastic hooks. The plunger assembly is adapted to move towards the connecting portion to push a liquid in the hollow barrel to be injected through a needle of the needle unit, and the plunger assembly is adapted to keep moving towards the connecting portion, such that the elastic hooks are engaged with the engaging structure.

A medical device for intradermal injection comprises an injection device 6 and a guiding device 1, which is placed on the skin surface 100 of a subject and comprises a tubular guiding device 2 to guide an axial movement of the injection device 6 toward the skin surface 100. A sleeve-shaped guiding portion 32, 33 tightly matches the profile at the distal end of the injection device 6 to prevent a tilting of the injection device 6 at a foremost distal position of the injection device 6 in the tubular guiding device 2. A positive-fit locking member 24 is provided at a side proximal to the sleeve-shaped guiding portion 32, 33, for locking the foremost distal position of the injection device 6 and coupling the injection device 6 to the guiding device 1. Locking of the injection device generates a sound, indicating that the medical device is ready for injection.

Drug delivery safety devices having trigger activation systems activated by pressure against the skin of a patient and which automatically shield the needle after withdrawing the needle from the skin of the patient.

A dental safety syringe comprising selectively attachable barrel and plunger assemblies, the barrel assembly desirably further comprising a needle cartridge containing a needle holder and spring, and having a distal end from which a needle can be made to project forwardly while administering a medication and then subsequently withdrawn into the needle cartridge to avoid contamination following or between injections. The needle cartridge also comprises a proximal end having a recess into which an ampule containing medication can be inserted prior to connecting the plunger assembly to the barrel assembly so that a rubber dam in the distal end of the ampule is pierced by the proximal end of the needle whenever the syringe is fully assembled.

A medical device having a frontal attachment and a connector housing having at least a body part of 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.