Abstract:
A breakable syringe includes a barrel, a connecting member, a needle, and a plunger. Thus, the needle can be retracted into the barrel after use, thereby preventing the user or other person from being hurt by the protruding needle, so as to provide a safety effect. In addition, the plunger can be broken, so that the needle is stored in the barrel, thereby achieving the safe and sanitary effect.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a breakable syringe, and more particularly to a breakable syringe that can be retracted inward by rotation.  
         [0003]     2. Description of the Related Art  
         [0004]     A conventional syringe comprises a barrel, a needle secured on an end of the barrel, and a plunger inserted into the barrel. When in use, the plunger is pushed forward to drain the air contained in the barrel outward to the ambient environment. Then, the plunger is pulled backward to draw the liquid medicine into the barrel. Thus, the plunger can be pushed forward to inject the liquid medicine through the needle into the human body. However, the needle is protruded outward from the barrel, so that the user or other person is easily hurt by the protruding needle after the syringe is used.  
       SUMMARY OF THE INVENTION  
       [0005]     The primary objective of the present invention is to provide a breakable syringe that can be retracted inward by rotation.  
         [0006]     Another objective of the present invention is to provide a breakable syringe, wherein the needle and the needle cannula can be retracted into the barrel after use, thereby preventing the user or other person from being hurt by the protruding needle, so as to provide a safety effect.  
         [0007]     A further objective of the present invention is to provide a breakable syringe, wherein the plunger can be broken, so that the needle cannula of the needle is stored in the barrel, thereby achieving the safe and sanitary effect.  
         [0008]     A further objective of the present invention is to provide a breakable syringe that can be assembled easily and conveniently, thereby facilitating the user using the breakable syringe.  
         [0009]     A further objective of the present invention is to provide a breakable syringe that has a rigid structure without detachment, so that the user can operate the breakable syringe safely.  
         [0010]     In accordance with the present invention, there is provided a breakable syringe, comprising a barrel, a connecting member, a needle, and a plunger, wherein:  
         [0011]     the barrel has an end formed with a through hole;  
         [0012]     the connecting member is movably mounted in the barrel and has a first end formed with a lug protruded outward from the through hole of the barrel, and a second end formed with a nozzle;  
         [0013]     the needle is mounted on the barrel and secured on the connecting member;  
         [0014]     the plunger has a first end inserted into the barrel and formed with a piston movably mounted in the barrel; and  
         [0015]     the piston of the plunger has a side formed with a reduced protrusion inserted into the nozzle of the connecting member.  
         [0016]     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0017]      FIG. 1  is an exploded perspective view of a breakable syringe in accordance with the preferred embodiment of the present invention;  
         [0018]      FIG. 1A  is a partially cross-sectional view of the connecting member of the breakable syringe as shown in  FIG. 1 ;  
         [0019]      FIG. 2  is a partially plan cross-sectional assembly view of the breakable syringe as shown in  FIG. 1 ;  
         [0020]      FIG. 3  is a schematic operational view of the breakable syringe as shown in  FIG. 2 ;  
         [0021]      FIG. 4  is a schematic operational view of the breakable syringe as shown in  FIG. 3 ;  
         [0022]      FIG. 5  is a schematic operational view of the breakable syringe as shown in  FIG. 4 ;  
         [0023]      FIG. 6  is a schematic operational view of the breakable syringe as shown in  FIG. 5 ;  
         [0024]      FIG. 7  is a schematic operational view of the breakable syringe as shown in  FIG. 6 ; and  
         [0025]      FIG. 8  is a schematic operational view of the breakable syringe as shown in  FIG. 6 .  
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0026]     Referring to the drawings and initially to  FIGS. 1 and 2 , a breakable syringe in accordance with the preferred embodiment of the present invention comprises a barrel  1 , a connecting member  2 , a needle  3 , and a plunger  4 .  
         [0027]     The barrel  1  has an end formed with a through hole  11  having an inner periphery formed with an inner thread  12 .  
         [0028]     As shown in  FIGS. 1 and 1 A, the connecting member  2  is movably mounted in the barrel  1  and has a first end formed with a gradually reduced tapered lug  23  protruded outward from the through hole  11  of the barrel  1 , a mediate portion formed with an enlarged flange  21 , and a second end formed with a gradually expanded nozzle  221 . The enlarged flange  21  of the connecting member  2  is engaged into the inner thread  12  of the barrel  1 . The lug  23  of the connecting member  2  is formed with a through hole  22 . The nozzle  221  of the connecting member  2  has an inner wall formed with a plurality of tapered protruding teeth  222  and a plurality of tapered guide grooves  223  located between the protruding teeth  222 .  
         [0029]     The needle  3  is mounted on the barrel  1  and secured on the connecting member  2 . The needle  3  has a first end formed with a tapered recess  32  to receive the lug  23  of the connecting member  2 . The first end of the needle  3  has a periphery formed with an enlarged flange  31  engaged into the inner thread  12  of the barrel  1 . The needle  3  has a second end provided with a needle cannula  33  communicating with the recess  32 .  
         [0030]     The plunger  4  has a first end inserted into the barrel  1  and formed with a piston  41  movably mounted in the barrel  1 . The plunger  4  has a second end protruded outward from the barrel  1 . The piston  41  of the plunger  4  has a first side formed with an annular groove  411  detachably connected to the first end of the plunger  4  and a second side formed with a reduced protrusion  42  inserted into the nozzle  221  of the connecting member  20 . The protrusion  42  of the plunger  4  has a periphery formed with a plurality of tapered protruding teeth  43  inserted into the guide grooves  223  of the connecting member  2  and engaged with the protruding teeth  222  of the connecting member  2 . The tapered protruding teeth  43  of the plunger  4  are arranged in a radiating manner. The protrusion  42  of the plunger  4  has an end formed with an elastic press bar  44  extended into the through hole  22  of the lug  23  of the connecting member  2 . The elastic press bar  44  is arranged in an oblique manner.  
         [0031]     In assembly, the connecting member  2  is movable in the barrel  1  and the enlarged flange  21  of the connecting member  2  is engaged into the inner thread  12  of the barrel  1 , so that the lug  23  of the connecting member  2  is protruded outward from the through hole  11  of the barrel  1  as shown in  FIG. 3 . Then, the piston  41  of the plunger  4  is inserted into the barrel  1 . Then, the enlarged flange  31  of the needle  3  is engaged into the inner thread  12  of the barrel  1 , so that the lug  23  of the connecting member  2  is inserted into the tapered recess  32  of the needle  3  as shown in  FIG. 4 .  
         [0032]     When in use, the piston  41  of the plunger  4  is pushed forward to drain the air contained in the barrel  1  outward to the ambient environment. Then, the piston  41  of the plunger  4  is pulled backward to draw the liquid medicine  50  into the barrel  1  as shown in  FIG. 4 . Then, after the liquid medicine  50  is completely injected outward from the barrel  1 , the plunger  4  is entirely inserted into the barrel  1 , so that the tapered protruding teeth  43  of the plunger  4  are inserted into the guide grooves  223  of the connecting member  2  and engaged with the protruding teeth  222  of the connecting member  2 , while the elastic press bar  44  of the plunger  4  is extended into the through hole  22  of the lug  23  of the connecting member  2  as shown in  FIG. 5 .  
         [0033]     At this time, the lug  23  of the connecting member  2  is closely forced into the tapered recess  32  of the needle  3 , thereby forming a vacuum state, so that the connecting member  2  is closely combined with the needle  3  without detachment.  
         [0034]     Then, the plunger  4  is rotated as shown in  FIG. 5 , so that the connecting member  2  and the needle  3  are rotated by rotation of the plunger  4  to detach from the inner thread  12  of the barrel  1 . Then, the plunger  4  is pulled backward to retract the needle  3  and the needle cannula  33  into the barrel  1  as shown in  FIG. 6 .  
         [0035]     At this time, the elastic press bar  44  of the plunger  4  is rested on the inner wall of the through hole  22  of the lug  23  of the connecting member  2 , so that the connecting member  2  is pressed in an oblique manner and the needle cannula  33  of the needle  3  is also pressed in an oblique manner to abut the wall of the inner thread  12  of the barrel  1  as shown in  FIG. 6 .  
         [0036]     Then, the plunger  4  is pushed forward into the barrel  1  as shown in  FIG. 7 , thereby bending and deforming the needle cannula  33  of the needle  3 .  
         [0037]     Alternatively, the piston  41  of the plunger  4  is detached from the plunger  4  at the position of the annular groove  411  and is urged in the inner wall of the barrel  1  as shown in  FIG. 8 , so that the needle cannula  33  of the needle  3  is stored in the barrel  1 .  
         [0038]     Accordingly, the plunger  4  can be broken, so that the needle cannula  33  of the needle  3  is stored in the barrel  1 , thereby achieving the safe and sanitary effect. In addition, the breakable syringe can be assembled easily and conveniently, thereby facilitating the user using the breakable syringe. Further, the breakable syringe has a rigid structure without detachment, so that the user can operate the breakable syringe safely.  
         [0039]     Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.