Abstract: An intravenous catheter introducing device includes a needle assembly and a flashback member. The flashback member defines a flashback chamber having an accommodation space with a volume that is variable upon application of a manual force to the flashback chamber such that a reduced pressure is created in the accommodation space to place the flashback chamber in a ready position, where a tip end of the needle assembly can be brought to pierce a patient's skin for introducing a tubular catheter into the patient's vein, while a biasing force is generated to act on the flashback chamber. A pressure counteracting member is disposed to resist the biasing force such that the flashback chamber can be held in the ready position without application of any manual force once the tip end has pierced into the skin in search of the vein, and such that blood flow into the needle assembly is facilitated to enable the user to check the introduction of the catheter.

Abstract: An intravenous catheter introducing device includes a needle cannula with a rear connecting end that is forced by a needle retracting member to displace relative to a barrel between a position of use to permit a needle tip to pierce a patient's vein, and a disposal position to permit retraction of the needle tip into the barrel. A tubular outlet member is disposed downstream of the rear connecting end, and is mounted radially and outwardly of the barrel. A flashback member can be connected to and in fluid communication with the tubular outlet member so as to permit the user to check whether a tubular catheter has been successfully introduced into a target vein of the patient. In addition, the flashback member can provide a blood drawing function to facilitate flow of blood into the flashback member.

Abstract: A cannula retractable medical collection device includes a cannula mount inserted into and axially slidable relative to a rear larger-diameter wall portion of a barrel, a double-ended needle cannula including a rear needle segment extending into an accommodation chamber in the cannula mount for pricking a stopper of a collection vial, and a front needle segment secured to the cannula mount by a needle hub. The front needle segment extends outwardly of the barrel in a position of use, and retreats inwardly and rearwardly of the barrel in a disposal position when the cannula mount is in the front and rear positions, respectively. A releasably retaining member includes a retaining hole formed in the larger-diameter wall portion, and a radially extending engaging peg engageable in the hole. An actuator is operable to disengage the peg from the hole so as to permit axial movement of the cannula mount.

Abstract: A respiratory mask includes a shield and a mask body. The shield includes an air-impermeable bent sheet that defines a rim-receiving recess. The mask body is detachably connected to the shield and includes a rim that is received in the rim-receiving recess and that defines a chamber therein. The shield cooperates with the mask body to define a gap therebetween. The rim is formed with at least an aperture that is in spatial communication with the chamber and the gap. A filter sheet is permeable to air and is attached to the rim to cover the aperture.

Abstract: A disposable syringe includes a needle assembly having a needle seat retained in a barrel by a grip member to fix a needle cannula, a tubular plunger movable in the barrel toward the needle seat during an injection course, and a coupling member having a retained shank in frictional engagement with the plunger, and an anchored portion disposed outwardly of the plunger to engage a rear anchoring portion of the needle seat when the coupling member is moved forwardly. When the plunger is moved further forward to cause the plunger to move relative to the coupling member, the retained shank is released to enable the needle assembly to retract into the plunger by means of a biasing member. A guiding sleeve is sleeved on the needle seat, and can be forced to extend between the needle seat and the grip member so as to decrease the frictional force therebetween for ensuring successful retraction of the needle assembly.

Abstract: An intravenous catheter introducing device includes a needle hub inserted into and axially slidable relative to an inner barrel wall surface of a barrel. The needle hub holds a needle cannula and permits the cannula to extend forwardly of the barrel for ready use. A catheter connection assembly is detachably sleeved on a front smaller-diameter wall portion of the barrel and permits a tip end of the needle cannula to project forwardly of a tubular cannula of the assembly. A releasably retaining member includes a retaining hole formed in a rear larger-diameter wall portion of the barrel, and a radially extending engaging peg engageable in the hole. Operation of an actuator mounted on the peg can disengage the peg from the hole so as to permit axial movement of the needle hub for drawing the needle cannula within the barrel.

Abstract: A disposable syringe includes a barrel having a retaining region to retain a needle seat for carrying a needle cannula, and a friction diminishing region extending forwardly from the retaining region and terminating at a shoulder abutment, a plunger movable in the barrel toward the needle seat, and a coupling member biased by a biasing member and having a retained portion to frictionally engage the plunger, and an anchored portion to engage an anchoring portion of the needle seat such that when the needle seat is moved past the friction diminishing region to abut against the shoulder abutment, a subsequent pushing force applied to the plunger results in release of the retained portion from the plunger, thereby enabling the anchored portion to be moved into the plunger by means of the biasing member.

Abstract: A disposable syringe includes a tubular needle seat inserted into a barrel for fixing a needle cannula. The needle seat has an axially extending cavity with a radially yieldable catch disposed therein. A plunger is movable in the barrel, and has an engaging head defining a rearwardly facing shoulder wall which is retained by the catch when the engaging head is extended into the cavity by a pushing force applied to the plunger. The barrel defines friction diminishing regions such that when the needle seat is moved past the friction diminishing regions to be placed to a disposal position, friction between the needle seat and the barrel is diminished, thereby facilitating a subsequent pulling action of the plunger for retracting the needle cannula into the barrel.

Abstract: A single-use syringe includes a barrel having front and rear passageways and a shoulder disposed there between, a plunger movable in the rear passageway, a carrier having a tail portion extending from a front end wall of the plunger, and pushing and retained regions formed forwardly of the tail portion, and a deformable sealing member in fluid-tight and slidable engagement with the barrel. The sealing member includes an inner surrounding wall surface with a yielding segment engaging the pushing region, and a retaining segment in frictional engagement with the retained region by a frictional force so as to confine a fluid-tight surrounding area. The frictional force is diminished when the yielding segment is depressed by the pushing region so as to facilitate release of the retained region from the retaining segment, thereby disrupting the fluid-tightness of the surrounding area and rendering the syringe unreusable.

Abstract: An intravenous catheter inserting device includes a catheter hub engaging an open forward end of a barrel and having a duct that communicates with a passage of the barrel. A tubular catheter is disposed to communicate with the duct, and permits a needle cannula to pass therethrough. A plunger is received in the passage and extends rearwardly of the barrel so as to be manually operable. The plunger has a cavity containing fluid at a reduced pressure, and is coupled with the needle cannula within the passage such that the needle cannula can be retracted into the cavity due to a pressure difference between the ambient air and the reduced pressure.

Abstract: An intravenous catheter introducing device includes a needle hub inserted into and axially slidable relative to an inner barrel wall surface of a barrel. The needle hub holds a needle cannula and permits the cannula to extend forwardly of the barrel for ready use. A catheter connection assembly is detachably sleeved on a front smaller-diameter wall portion of the barrel and permits a tip end of the needle cannula to project forwardly of a tubular cannula of the assembly. A releasably retaining member includes a retaining hole formed in a rear larger-diameter wall portion of the barrel, and a radially extending engaging peg engageable in the hole. Operation of an actuator mounted on the peg can disengage the peg from the hole so as to permit axial movement of the needle hub for drawing the needle cannula within the barrel.

Abstract: A cannula retractable medical collection device includes a cannula mount inserted into and axially slidable relative to a rear larger-diameter wall portion of a barrel, a double-ended needle cannula including a rear needle segment extending into an accommodation chamber in the cannula mount for pricking a stopper of a collection vial, and a front needle segment secured to the cannula mount by a needle hub. The front needle segment extends outwardly of the barrel in a position of use, and retreats inwardly and rearwardly of the barrel in a disposal position when the cannula mount is in the front and rear positions, respectively. A releasably retaining member includes a retaining hole formed in the larger-diameter wall portion, and a radially extending engaging peg engageable in the hole. An actuator is operable to disengage the peg from the hole so as to permit axial movement of the cannula mount.

Abstract: A respiratory mask includes a shield and a mask body. The shield includes an air-impermeable bent sheet that defines a rim-receiving recess. The mask body is detachably connected to the shield and includes a rim that is received in the rim-receiving recess and that defines a chamber therein. The shield cooperates with the mask body to define a gap therebetween. The rim is formed with at least an aperture that is in spatial communication with the chamber and the gap. A filter sheet is permeable to air and is attached to the rim to cover the aperture.

Abstract: A disposable syringe includes a plunger movable in a barrel relative to a needle seat that engages an inner surrounding barrel wall surface of the barrel by a resisting force. The plunger includes a plunger body and a coupling rod which is in frictional engagement with the plunger body and which has a central anchored area disposed to engage an anchoring portion of the needle seat by a holding force. As such, when the plunger body is moved to bring the central anchored area into engagement with the anchoring portion, the resisting force is overcome to permit disengagement of the needle seat from the barrel, and the coupling rod and the needle seat can be retracted into the plunger body by virtue of a biasing action of a biasing member.

Abstract: An intravenous catheter inserting device includes a catheter hub engaging an open forward end of a barrel and having a duct that communicates with a passage of the barrel. A tubular catheter is disposed to communicate with the duct, and permits a needle cannula to pass therethrough. A plunger is received in the passage and extends rearwardly of the barrel so as to be manually operable. The plunger has a cavity containing fluid at a reduced pressure, and is coupled with the needle cannula within the passage such that the needle cannula can be retracted into the cavity due to a pressure difference between the ambient air and the reduced pressure.

Abstract: A disposable syringe includes a tubular barrier member retained in a rear passageway of a barrel. A tubular needle seat for fixing a needle cannula is retained on the barrier member, and abuts against an abutment wall in the front passageway of the barrel while the needle cannula is disposed outwardly of the barrel. A plunger is slidable in the rear passageway, and has a seal member to seal a cavity confined in a plunger body and containing a fluid at a reduced pressure. When a pushing force applied to the plunger body moves the barrier member against the first and second frictional forces, the needle seat is released, and the seal member is ruptured, so that the needle seat and the needle cannula are suctioned into the cavity due to the pressure difference between the ambient atmosphere and the reduced pressure.

Abstract: A drug delivery device includes an insert tube and an elongate plunger. The insert tube has a tubular wall that confines a passage and that has drug entrance and release ends. The drug release end has first and second radial parts, and is provided with a flexible grating that includes sets of first and second flexible strips. The first and second flexible strips extend from the first and second radial parts of the drug release end, respectively. The elongate plunger has a drug pushing end and an operating end, is slidably movable in the passage, and has a length sufficient to enable the drug pushing end to push a drug in the passage to move out of the passage and spread apart the first and second flexible strips for delivering the drug into a body cavity.

Abstract: A disposable syringe includes a tubular barrier member retained in a rear passageway of a barrel. A tubular needle seat for fixing a needle cannula is retained on the barrier member, and abuts against an abutment wall in the front passageway of the barrel while the needle cannula is disposed outwardly of the barrel. A plunger is slidable in the rear passageway, and has a seal member to seal a cavity confined in a plunger body and containing a fluid at a reduced pressure. When a pushing force applied to the plunger body moves the barrier member against the first and second frictional forces, the needle seat is released, and the seal member is ruptured, so that the needle seat and the needle cannula are suctioned into the cavity due to the pressure difference between the ambient atmosphere and the reduced pressure.

Abstract: A drug delivery device includes an insert tube and an elongate plunger. The insert tube has a tubular wall that confines a passage and that has drug entrance and release ends. The drug release end has first and second radial parts, and is provided with a flexible grating that includes sets of first and second flexible strips. The first and second flexible strips extend from the first and second radial parts of the drug release end, respectively. The elongate plunger has a drug pushing end and an operating end, is slidably movable in the passage, and has a length sufficient to enable the drug pushing end to push a drug in the passage to move out of the passage and spread apart the first and second flexible strips for delivering the drug into a body cavity.