Double-cylinder injector capable of avoiding residual liquid medicine on needle head

Abstract

A double-cylinder injector capable of avoiding needle liquid medicine residue comprises an injector body, an inner needle cylinder, an inner push rod and an executing mechanism. The injector comprises an outer needle cylinder, a needle head and a piston body; an inner cavity A is formed in the outer needle cylinder, the needle head is connected with the outer needle cylinder, and the piston body is movably installed in the inner cavity A of the outer needle cylinder. An inner cavity B is formed in the piston body; a needle tip is arranged at the lower end of the inner needle cylinder, an inner cavity C is formed in the inner needle cylinder, and the inner needle cylinder is movably installed in the inner cavity B of the piston body; the inner push rod is movably mounted in an inner cavity C of the inner needle cylinder; the execution mechanism drives the inner needle cylinder to move in the inner cavity B, so that the needle tip extends out of the piston body and pierces the sealing sleeve; and the execution mechanism drives the inner push rod to move in the inner cavity C, so that air in the empty hole is pushed into the needle head of the injector through the needle tip. After injection is completed, residual liquid medicine in the needle head can be pushed out, and waste of the liquid medicine is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical supplies, in particular to a double-barrel syringe capable of avoiding residual liquid medicine in the needle tip. Background Art

[0002] A syringe is the most common medical supply. When a conventional syringe is used, pushing the piston body to the bottom can completely push out the liquid medicine in the syringe barrel through the needle tip. However, at this time, there is still a small amount of liquid medicine remaining in the needle tip and unable to be pushed out, resulting in waste of the liquid medicine. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a double-barrel syringe capable of avoiding residual liquid medicine in the needle tip, which solves the problem that after injection with the existing syringe, there is still a small amount of liquid medicine remaining in the needle tip and unable to be pushed out, resulting in waste of the liquid medicine.

[0004] The technical solution of the utility model is: a double-barrel syringe capable of avoiding residual liquid medicine in the needle tip, comprising a syringe, an inner syringe barrel, an inner push rod and an actuating mechanism; the syringe comprises an outer syringe barrel, a needle tip and a piston body; an inner cavity A is arranged inside the outer syringe barrel, the needle tip is connected to the outer syringe barrel, and the piston body is movably installed in the inner cavity A of the outer syringe barrel; an inner cavity B is arranged inside the piston body; the lower end of the inner syringe barrel is provided with a needle tip, an inner cavity C is arranged inside the inner syringe barrel, and the inner syringe barrel is movably installed in the inner cavity B of the piston body; the inner push rod is movably installed in the inner cavity C of the inner syringe barrel; the actuating mechanism is associated with the inner syringe barrel and is used for driving the inner syringe barrel to move in the inner cavity B, so that the needle tip extends out of the piston body and pierces through the sealing sleeve; the actuating mechanism is associated with the inner push rod and is used for driving the inner push rod to move in the inner cavity C, so that the air in the blanking hole is pushed out to the needle tip of the syringe through the needle tip.

[0005] A further technical solution of the utility model is: the two ends of the outer syringe barrel are respectively provided with a needle tip installation port and a piston installation port, and an inner cavity A communicating the needle tip installation port and the piston installation port is arranged inside the outer syringe barrel; the needle tip is detachably connected to the needle tip installation port of the outer syringe barrel; the upper and lower ends of the piston body are respectively provided with a push-pull disc and a piston head, a sealing sleeve is sleeved outside the piston head, the piston body is movably installed in the inner cavity A of the outer syringe barrel through the piston installation port at the lower end, the push-pull disc of the piston body is located outside the outer syringe barrel, a circumferential sealing surface is formed between the sealing sleeve of the piston body and the inner cavity A of the outer syringe barrel, an inner cavity B penetrating through both ends of the piston body is arranged inside the piston body, the inner cavity B sequentially comprises a guiding hole A, a containing hole and a needle tip hole A along the direction from the push-pull disc to the piston head, a step surface A is arranged between the guiding hole A and the containing hole, a step surface C is arranged between the containing hole and the needle tip hole A, and a circular positioning plate A is fixedly arranged in the guiding hole A;

[0006] The inner syringe includes a barrel section, a head section and a needle tip connected in sequence from the upper end to the lower end, a step surface B is provided between the barrel section and the head section, the head section is a cylindrical section with a missing corner, an inner cavity C is provided inside the inner syringe that passes through both ends thereof, the inner cavity C includes a guide hole B, a hollow hole and a needle tip hole B connected in sequence from the barrel section to the needle tip, a step surface D is provided between the guide hole B and the hollow hole, a step surface E is provided between the hollow hole and the needle tip hole B, an annular positioning plate B is fixedly provided in the guide hole B, and one end of the needle tip The seal is fixedly installed in the needle tip hole B, the other end of the needle tip extends out of the head section of the inner syringe, and the empty hole is connected to the outside only through the inner hole of the needle tip; the inner syringe is movably installed in the inner cavity B of the piston body, and the inner syringe slides with the guide hole A or the receiving hole of the piston body through the outer cylindrical surface of the head section; when the missing corner of the head section is staggered with the step surface A, the sliding range of the head section is only located in the guide hole A, and when the missing corner of the head section is opposite to the step surface A, the sliding range of the head section includes the guide hole A and the receiving hole;

[0007] The inner push rod comprises a rod portion and a head portion connected in sequence from the upper end to the lower end, a step surface F is provided between the rod portion and the head portion, and the head portion is a cylindrical portion with a notched corner; the inner push rod is movably installed in the inner cavity C of the inner syringe, and the inner push rod slides with the guide hole B or the empty hole of the inner syringe through the outer cylindrical surface of the head portion; when the notched corner of the head portion is offset from the step surface D, the sliding range of the head portion is only located in the guide hole B, and when the notched corner of the head portion is directly opposite to the step surface D, the sliding range of the head portion includes the guide hole B and the empty hole;

[0008] The actuator includes a spring A, a spring B and a turntable; the spring A is sleeved on the barrel section of the inner syringe, the upper end of the spring A abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B; when the missing corner of the head section is misaligned with the step surface A, the spring A presses the head section against the step surface A of the piston body through elastic force, at which time the needle tip does not extend from the needle tip hole A of the piston body; when the missing corner of the head section is directly opposite to the step surface A, the spring A pushes the head section into the receiving hole through elastic force, and presses the head section against the step surface C, at which time the needle tip extends from the needle tip hole A of the piston body and pierces the sealing sleeve; the spring B is sleeved on the rod of the inner push rod, the upper end of the spring B abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B; when the missing corner of the head section is misaligned with the step surface A, the spring A presses the head section against the step surface A of the piston body through elastic force, and at this time the needle tip extends from the needle tip hole A of the piston body and pierces the sealing sleeve; the spring B is sleeved on the rod section of the inner push rod, the upper end of the spring B abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B Plate B abuts against each other, and the lower end of spring B abuts against the step surface F; when the missing corner of the head is misaligned with the step surface D, the spring B presses the head of the inner push rod against the step surface D of the inner syringe through elastic force; when the missing corner of the head is directly opposite to the step surface D, the spring B pushes the head into the empty hole through elastic force, and presses the head against the step surface E of the inner syringe; the two side end surfaces of the turntable are respectively fixedly connected with a docking sleeve A and a docking sleeve B; when the turntable is plugged into the barrel section of the inner syringe through the docking sleeve A, the rotation of the turntable drives the inner syringe to rotate synchronously; when the turntable is plugged into the rod part of the inner push rod through the docking sleeve B, the rotation of the turntable drives the inner push rod to rotate synchronously.

[0009] A further technical solution of the present utility model is that an annular guide plate A is fixedly arranged in the guide hole A of the piston body, and the inner hole of the guide plate A is in sliding fit with the barrel section of the inner syringe, so as to provide moving guidance for the barrel section of the inner syringe.

[0010] A further technical solution of the present utility model is that an annular guide plate B is fixedly arranged in the guide hole B of the inner syringe, and the inner hole of the guide plate B is in sliding fit with the rod portion of the inner push rod, so as to provide moving guidance for the rod portion of the inner push rod.

[0011] A further technical solution of the present utility model is that the piston body is composed of a split body A, a split body B and a split body C which are sequentially threadedly connected from the upper end to the lower end. The push-pull disc and the guide plate A are respectively arranged at both ends of the split body A. The positioning plate A is arranged in the inner hole of the split body B, and the piston head is arranged at the lower end of the split body C.

[0012] A further technical solution of the present utility model is that the inner syringe is composed of a split body D, a split body E and a split body F which are sequentially threadedly connected from the upper end to the lower end. The guide plate B and the positioning plate B are respectively arranged at both ends of the split body E. The head section and the needle tip are arranged at the lower end of the split body F.

[0013] A further technical solution of the present utility model is that the turntable includes a disc-shaped main body and four lifting ears fixedly connected to the edge of the disc-shaped main body and evenly distributed in a ring shape; a positioning pit adapted to the shape of the turntable is arranged on the push-pull disc of the piston body; the disc-shaped main body of the turntable is embedded and installed in the positioning pit of the push-pull disc, and the four lifting ears of the turntable extend outside the positioning pit of the push-pull disc.

[0014] A further technical solution of the present utility model is that the docking sleeve A of the turntable is in spline movable insertion with the barrel section of the inner syringe; the docking sleeve B of the turntable is in spline movable insertion with the rod portion of the inner push rod.

[0015] The present utility model has the following advantages compared with the prior art:

[0016] 1. After the injection is completed, the residual liquid medicine in the needle can be pushed out, avoiding waste of liquid medicine.

[0017] 2. The operation of pushing out the residual liquid medicine is simple (only two rotations of the turntable are required), and the reliability is good (the structure of the turntable and the push-pull disc fitting can avoid accidental contact and rotation), and the market application prospect is relatively good.

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments. Description of the Drawings

[0019] Figure 1 is the state diagram of the present utility model after extracting liquid medicine;

[0020] Figure 2 is the state diagram of the present utility model after injecting liquid medicine;

[0021] Figure 3 It is the initial state diagram in the usage method;

[0022] Figure 4 It is the state diagram at the end of sub-step B of step S01 in the usage method;

[0023] Figure 5 It is the state diagram at the end of sub-step A of step S02 in the usage method;

[0024] Figure 6 It is the state diagram at the end of sub-step B of step S02 in the usage method;

[0025] Figure 7 It is the structural diagram of the split part A of the piston body from a top-down perspective;

[0026] Figure 8 It is the structural diagram of the split part A of the piston body from a bottom-up perspective;

[0027] Figure 9 It is the structural diagram of the turntable from a top-down perspective;

[0028] Figure 10 It is the structural diagram of the turntable from a bottom-up perspective;

[0029] Figure 11 It is the top-down perspective view of the assembled turntable and split part A;

[0030] Figure 12 It is the bottom-up perspective view of the assembled turntable and split part A;

[0031] Figure 13 It is the structural diagram of the split part F of the inner syringe in the first perspective;

[0032] Figure 14 It is the structural diagram of the split part F of the inner syringe in the second perspective;

[0033] Figure 15 It is the structural diagram of the split part F of the inner syringe in the third perspective.

[0034] Legend: Outer syringe barrel 11; Needle mounting port 111; Piston insertion port 112; Needle 12; Piston body 13; Push-pull plate 131; Positioning pit 1311; Piston head 132; Sealing sleeve 133; Guide hole A 134; Accommodating hole 135; Needle tip hole A 136; Step surface A 137; Step surface C 138; Positioning plate A 139; Guide plate A 130; Inner syringe barrel 2; Barrel section 21; Head section 22; Needle tip 23; Step surface B 24; Guide hole B 25; Empty hole 26; Step surface D 27; Step surface E 28; Positioning plate B 29; Guide plate B 20; Inner push rod 3; Rod part 31; Head part 32; Step surface F 33; Spring A 4; Spring B 5; Turntable 6; Docking sleeve A 61; Docking sleeve B 62; Disk-shaped main body 63; Handle 64. Detailed implementation Example 1

[0035] As Figures 1-15 shown, a double-barrel syringe that can avoid residual liquid medicine in the needle includes a syringe, an inner syringe barrel 2, an inner push rod 3, and an actuator.

[0036] The syringe includes an outer syringe barrel 11, a needle 12, and a piston body 13. The two ends of the outer syringe barrel 11 are respectively provided with a needle mounting port 111 and a piston insertion port 112, and an inner cavity A communicating the needle mounting port 111 and the piston insertion port 112 is provided inside the outer syringe barrel 11. The needle 12 is detachably connected to the needle mounting port 111 of the outer syringe barrel 11. The upper and lower ends of the piston body 13 are respectively provided with a push-pull plate 131 and a piston head 132. A sealing sleeve 133 is sleeved outside the piston head 132. The piston body is movably installed in the inner cavity A of the outer syringe barrel through the piston insertion port. The push-pull plate 131 of the piston body 13 is located outside the outer syringe barrel 11. An annular sealing surface is formed between the sealing sleeve 133 of the piston body 13 and the inner cavity A of the outer syringe barrel 11. An inner cavity B penetrating through both ends of the piston body 13 is provided inside the piston body 13. The inner cavity B sequentially includes a guide hole A 134, an accommodating hole 135, and a needle tip hole A 136 along the direction from the push-pull plate 131 to the piston head 132. A step surface A 137 is provided between the guide hole A 134 and the accommodating hole 135, and a step surface C 138 is provided between the accommodating hole 135 and the needle tip hole A 136. An annular positioning plate A 139 is fixedly provided in the guide hole A 134.

[0037] The inner syringe 2 includes a barrel section 21, a head section 22 and a needle tip 23 which are connected in sequence from the upper end to the lower end. A step surface B24 is provided between the barrel section 21 and the head section 22. The head section 22 is a cylinder with a missing corner. An inner cavity C is provided inside the inner syringe 2 which passes through both ends thereof. The inner cavity C includes a guide hole B25, a hollow hole 26 and a needle tip hole B which are connected in sequence from the barrel section 21 to the needle tip 23. A step surface D27 is provided between the guide hole B25 and the hollow hole 26. A step surface E28 is provided between the hollow hole 26 and the needle tip hole B. An annular positioning plate B29 is fixedly provided in the guide hole B25. One end of the needle tip 23 is sealed and fixedly installed in the needle tip hole B. The other end of the needle tip 23 extends out of the head section 22 of the inner syringe 2. The hollow hole 26 is connected to the outside only through the inner hole of the needle tip 23. The inner syringe 2 is movably installed in the inner cavity B of the piston body 13, and the inner syringe 2 slides with the guide hole A134 or the receiving hole 135 of the piston body 13 through the outer cylindrical surface of the head section 22. When the missing corner of the head section 22 of the inner syringe 2 is staggered with the step surface A137 of the piston body 13, the sliding range of the head section 22 is only located in the guide hole A134, and when the missing corner of the head section 22 of the inner syringe 2 is directly opposite to the step surface A137 of the piston body 31, the sliding range of the head section 22 includes the guide hole A134 and the receiving hole 135.

[0038] The air push-down mechanism includes an inner push rod 3 and a spring B5. The inner push rod 3 includes a rod portion 31 and a head portion 32 connected in sequence from the upper end to the lower end, a step surface F33 is provided between the rod portion 31 and the head portion 32, and the head portion 32 is a cylindrical shape with a missing corner. The inner push rod 3 is movably installed in the inner cavity C of the inner syringe 2, and the inner push rod 3 slides with the guide hole B25 or the empty hole 26 of the inner syringe 2 through the outer cylindrical surface of the head portion 32. When the missing corner of the head portion 32 of the inner push rod 3 is offset from the step surface D27 of the inner syringe 2, the sliding range of the head portion 32 of the inner push rod 3 is only located in the guide hole B25 of the inner syringe 2, and when the missing corner of the head portion 32 of the inner push rod 3 is directly opposite to the step surface D27 of the inner syringe 2, the sliding range of the head portion 32 of the inner push rod 3 includes the guide hole B25 and the empty hole 26.

[0039] The actuator includes spring A4, spring B5 and turntable 6. Spring A4 is sleeved on the barrel section 21 of the inner syringe 2. The upper end of spring A4 abuts against the positioning plate A139, and the lower end of spring A4 abuts against the step surface B24. When the notch of the head section 22 of the inner syringe 2 is misaligned with the step surface A137 of the piston body 13, spring A4 presses the head section 22 of the inner syringe 2 against the step surface A137 of the piston body 13 through elastic force. At this time, the needle tip 23 does not protrude from the needle tip hole A136 of the piston body 13. When the notch of the head section 22 of the inner syringe 2 is aligned with the step surface A137 of the piston body 13, spring A4 pushes the head section 22 of the inner syringe 2 into the receiving hole 135 of the piston body 13 through elastic force and presses the head section 22 of the inner syringe 2 against the step surface C138 of the piston body 13. At this time, the needle tip 23 protrudes from the needle tip hole A136 of the piston body 13 and pierces the sealing sleeve 133. Spring B5 is sleeved on the rod portion 31 of the inner push rod 3. The upper end of spring B5 abuts against the positioning plate B29 of the inner syringe 2, and the lower end of spring B5 abuts against the step surface F33 of the inner push rod 3. When the notch of the head portion 32 of the inner push rod 3 is misaligned with the step surface D27 of the inner syringe 2, spring B5 presses the head portion 32 of the inner push rod 3 against the step surface D27 of the inner syringe 2 through elastic force. When the notch of the head portion 32 of the inner push rod 3 is aligned with the step surface D27 of the inner syringe 2, spring B5 pushes the head portion 32 of the inner push rod 3 into the empty hole 26 of the inner syringe 2 through elastic force and presses the head portion 32 of the inner push rod 3 against the step surface E28 of the inner syringe 2. Docking sleeves A61 and B62 are fixedly connected to the two side end faces of the turntable 6 respectively. When the turntable 6 is inserted into the barrel section 21 of the inner syringe 2 through the docking sleeve A61, the rotation of the turntable 6 drives the inner syringe 2 to rotate synchronously. When the turntable 6 is inserted into the rod portion 31 of the inner push rod 3 through the docking sleeve B62, the rotation of the turntable 6 drives the inner push rod 3 to rotate synchronously.

[0040] Preferably, an annular guide plate A130 is fixedly provided in the guide hole A134 of the piston body 13. The inner hole of the guide plate A130 is in sliding fit with the barrel section 21 of the inner syringe 2, so as to provide moving guidance for the barrel section 21 of the inner syringe 2.

[0041] Preferably, an annular guide plate B20 is fixedly provided in the guide hole B25 of the inner syringe 2. The inner hole of the guide plate B20 is in sliding fit with the rod portion 31 of the inner push rod 3, so as to provide moving guidance for the rod portion 31 of the inner push rod 3.

[0042] Preferably, the piston body 13 is composed of a split body A, a split body B and a split body C that are sequentially threadedly connected from the upper end to the lower end. The push-pull disc 131 and the guide plate A130 are respectively arranged at both ends of the split body A. The positioning plate A139 is arranged in the inner hole of the split body B, and the piston head 132 is arranged at the lower end of the split body C.

[0043] Preferably, the inner syringe barrel 2 is composed of a split part D, a split part E, and a split part F that are threadedly connected in sequence from the upper end to the lower end. The guide plate B20 and the positioning plate B29 are respectively arranged at both ends of the split part E, and the head section 22 is arranged at the lower end of the split part F.

[0044] Preferably, the turntable 6 includes a disc-shaped main body 63 and four lifting lugs 64 fixedly connected to the edge of the disc-shaped main body 63 and evenly distributed in a ring. The docking sleeve A61 and the docking sleeve B62 are respectively arranged at the centers of the two side surfaces of the disc-shaped main body 63. Correspondingly, a positioning pit 1311 adapted to the shape of the turntable 6 is provided on the push-pull disc 131 of the piston body 13. The disc-shaped main body 63 of the turntable 6 is embedded and installed in the positioning pit 1311 of the push-pull disc 131, and the four lifting lugs of the turntable extend outside the positioning pit of the push-pull disc.

[0045] Preferably, the docking sleeve A61 of the turntable 6 is movably inserted with the barrel section 21 of the inner syringe barrel 2 by means of splines, so as to simultaneously achieve sliding connection and torque transmission. The docking sleeve B62 of the turntable 6 is movably inserted with the rod portion 31 of the inner push rod 3 by means of splines, so as to simultaneously achieve sliding connection and torque transmission.

[0046] A method for pushing out the residual liquid medicine in the needle head, based on the above double-barrel syringe that can avoid the residual liquid medicine in the needle head, the execution timing of the method is after the liquid medicine in the inner cavity A of the outer syringe barrel is pushed out, and at this time the piston body has been pushed to the bottom of the inner cavity A of the outer syringe barrel.

[0047] Before the method is executed, the above double-barrel syringe that can avoid the residual liquid medicine in the needle head is in an initial state, and the initial state is as follows:

[0048] 1. The turntable 6 is embedded and installed in the positioning pit 1311 of the push-pull disc 131 of the piston body 13, and the docking sleeve A61 of the turntable 6 is inserted with the barrel section 21 of the inner syringe barrel 2;

[0049] 2. The notch of the head section 22 of the inner syringe barrel 2 is misaligned with the step surface A137 of the piston body 13, and the spring A4 presses the head section 22 of the inner syringe barrel 2 against the step surface A137 of the piston body 13 by elastic force;

[0050] 3. The notch of the head 32 of the inner push rod 3 is misaligned with the step surface D27 of the inner syringe barrel 2, and the spring B5 presses the head 32 of the inner push rod 3 against the step surface D27 of the inner syringe barrel 2 by elastic force.

[0051] The method steps are as follows:

[0052] S01, connect the air-pushing path:

[0053] A. Lift the turntable 6 to make the disc-shaped main body 63 leave the positioning pit 1311 of the push-pull disc 131, and keep the docking sleeve A61 inserted with the barrel section 21 of the inner syringe barrel 2;

[0054] B. Rotate the turntable 6, thereby driving the inner syringe barrel 2 to rotate. When the notch of the head section 22 of the inner syringe barrel 2 is aligned with the stepped surface A137 of the piston body 13, the spring A4 pushes the head section 22 of the inner syringe barrel 2 into the receiving hole 135 of the piston body 13 by elastic force, and makes the head section 22 of the inner syringe barrel 2 press against the stepped surface C138 of the piston body 13. At this time, the needle tip 23 extends out from the needle tip hole A136 of the piston body 13 and pierces the sealing sleeve 133, so that the empty hole 26 of the inner syringe barrel 2 is communicated with the syringe needle 12 through the inner hole of the needle tip 23.

[0055] In this step, when the head section 22 of the inner syringe barrel 2 enters the receiving hole 135 of the piston body 13, the inner syringe barrel 2 is radially positioned and cannot rotate.

[0056] S02, eject the residual liquid medicine:

[0057] A. Lift the turntable 6 to separate the docking sleeve A61 from the barrel section 21 of the inner syringe barrel 2; flip the turntable 6 and insert the docking sleeve B62 into the rod portion 31 of the inner push rod 3.

[0058] B. Rotate the turntable 6, thereby driving the inner push rod 3 to rotate. When the notch of the head 32 of the inner push rod 3 is aligned with the stepped surface D27 of the inner syringe barrel 2, the spring B5 pushes the head 32 of the inner push rod 3 into the empty hole 26 of the inner syringe barrel 2 by elastic force, and pushes the air in the empty hole 26 into the syringe needle 12 through the inner hole of the needle tip 23, thereby ejecting the residual liquid medicine in the syringe needle 12. Finally, the head 32 of the inner push rod 3 presses against the stepped surface E28 of the inner syringe barrel 2.

[0059] In this step, when the head 32 of the inner push rod 3 enters the empty hole 26 of the inner syringe barrel 2, the inner push rod 3 is radially positioned and cannot rotate.

[0060] In this step, when the head 32 of the inner push rod 3 enters the empty hole 26 of the inner syringe barrel 2, a surface seal is formed between the head of the inner push rod 3 and the empty hole 26 of the inner syringe barrel 2.

Claims

1. A double-barreled syringe capable of avoiding residual liquid in the needle, characterized by: It comprises a syringe, an inner syringe, an inner push rod and an actuator; the syringe comprises an outer syringe, a needle and a piston body; an inner cavity A is arranged inside the outer syringe, the needle is connected to the outer syringe, and the piston body is movably installed in the inner cavity A of the outer syringe; an inner cavity B is arranged inside the piston body; a needle tip is arranged at the lower end of the inner syringe, an inner cavity C is arranged inside the inner syringe, and the inner syringe is movably installed in the inner cavity B of the piston body; the inner push rod is movably installed in the inner cavity C of the inner syringe; the actuator is associated with the inner syringe, and is used to drive the inner syringe to move in the inner cavity B, thereby making the needle tip extend to the outside of the piston body and pierce the sealing sleeve; the actuator is associated with the inner push rod, and is used to drive the inner push rod to move in the inner cavity C, thereby making the air in the empty hole be pushed out through the needle tip into the needle of the syringe.

2. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 1, characterized in that: The outer syringe is provided with a needle installation port and a piston installation port at both ends, and an inner cavity A connecting the needle installation port and the piston installation port is provided inside the outer syringe; the needle is detachably connected to the needle installation port of the outer syringe; a push-pull disk and a piston head are provided at the upper and lower ends of the piston body, a sealing sleeve is sleeved on the outside of the piston head, and the piston body is movably installed in the inner cavity A of the outer syringe through the piston installation port at the lower end, the push-pull disk of the piston body is located outside the outer syringe, and an annular sealing surface is formed between the sealing sleeve of the piston body and the inner cavity A of the outer syringe, and an inner cavity B passing through both ends of the piston body is provided inside the piston body, and the inner cavity B includes a guide hole A, a receiving hole and a needle tip hole A in sequence along the direction from the push-pull disk to the piston head, a step surface A is provided between the guide hole A and the receiving hole, a step surface C is provided between the receiving hole and the needle tip hole A, and an annular positioning plate A is fixedly provided in the guide hole A; The inner syringe includes a barrel section, a head section and a needle tip connected in sequence from the upper end to the lower end, a step surface B is provided between the barrel section and the head section, the head section is a cylindrical section with a missing corner, an inner cavity C is provided inside the inner syringe that passes through both ends thereof, the inner cavity C includes a guide hole B, a hollow hole and a needle tip hole B connected in sequence from the barrel section to the needle tip, a step surface D is provided between the guide hole B and the hollow hole, a step surface E is provided between the hollow hole and the needle tip hole B, an annular positioning plate B is fixedly provided in the guide hole B, and one end of the needle tip The seal is fixedly installed in the needle tip hole B, the other end of the needle tip extends out of the head section of the inner syringe, and the empty hole is connected to the outside only through the inner hole of the needle tip; the inner syringe is movably installed in the inner cavity B of the piston body, and the inner syringe slides with the guide hole A or the receiving hole of the piston body through the outer cylindrical surface of the head section; when the missing corner of the head section is staggered with the step surface A, the sliding range of the head section is only located in the guide hole A, and when the missing corner of the head section is opposite to the step surface A, the sliding range of the head section includes the guide hole A and the receiving hole; The inner push rod comprises a rod portion and a head portion connected in sequence from the upper end to the lower end, a step surface F is provided between the rod portion and the head portion, and the head portion is a cylindrical portion with a notched corner; the inner push rod is movably installed in the inner cavity C of the inner syringe, and the inner push rod slides with the guide hole B or the empty hole of the inner syringe through the outer cylindrical surface of the head portion; when the notched corner of the head portion is offset from the step surface D, the sliding range of the head portion is only located in the guide hole B, and when the notched corner of the head portion is directly opposite to the step surface D, the sliding range of the head portion includes the guide hole B and the empty hole; The actuator includes a spring A, a spring B and a turntable; the spring A is sleeved on the barrel section of the inner syringe, the upper end of the spring A abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B; when the missing corner of the head section is misaligned with the step surface A, the spring A presses the head section against the step surface A of the piston body through elastic force, at which time the needle tip does not extend from the needle tip hole A of the piston body; when the missing corner of the head section is directly opposite to the step surface A, the spring A pushes the head section into the receiving hole through elastic force, and presses the head section against the step surface C, at which time the needle tip extends from the needle tip hole A of the piston body and pierces the sealing sleeve; the spring B is sleeved on the rod of the inner push rod, the upper end of the spring B abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B; when the missing corner of the head section is misaligned with the step surface A, the spring A presses the head section against the step surface A of the piston body through elastic force, and at this time the needle tip extends from the needle tip hole A of the piston body and pierces the sealing sleeve; the spring B is sleeved on the rod section of the inner push rod, the upper end of the spring B abuts against the positioning plate A, and the lower end of the spring A abuts against the step surface B Plate B abuts against each other, and the lower end of spring B abuts against the step surface F; when the missing corner of the head is misaligned with the step surface D, the spring B presses the head of the inner push rod against the step surface D of the inner syringe through elastic force; when the missing corner of the head is directly opposite to the step surface D, the spring B pushes the head into the empty hole through elastic force, and presses the head against the step surface E of the inner syringe; the two side end surfaces of the turntable are respectively fixedly connected with a docking sleeve A and a docking sleeve B; when the turntable is plugged into the barrel section of the inner syringe through the docking sleeve A, the rotation of the turntable drives the inner syringe to rotate synchronously; when the turntable is plugged into the rod part of the inner push rod through the docking sleeve B, the rotation of the turntable drives the inner push rod to rotate synchronously.

3. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 2, characterized in that: An annular guide plate A is fixedly provided in the guide hole A of the piston body, and the inner hole of the guide plate A is slidably matched with the barrel section of the inner syringe, thereby providing movement guidance for the barrel section of the inner syringe.

4. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 3, characterized in that: An annular guide plate B is fixedly provided in the guide hole B of the inner syringe, and the inner hole of the guide plate B is slidably matched with the rod portion of the inner push rod, thereby providing movement guidance for the rod portion of the inner push rod.

5. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 4, characterized in that: The piston body consists of split A, split B and split C which are threadedly connected in sequence from the upper end to the lower end. The push-pull plate and the guide plate A are respectively arranged at the two ends of the split A, the positioning plate A is arranged in the inner hole of the split B, and the piston head is arranged at the lower end of the split C.

6. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 5, characterized in that: The inner syringe comprises a split D, a split E and a split F which are threadedly connected in sequence from the upper end to the lower end. The guide plate B and the positioning plate B are respectively arranged at the two ends of the split E, and the head section and the needle tip are arranged at the lower end of the split F.

7. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 6, characterized in that: The turntable includes a disk-shaped body and four lifting ears fixedly connected to the edge of the disk-shaped body and evenly distributed in a ring shape; a positioning pit adapted to the shape of the turntable is provided on the push-pull disk of the piston body; the disk-shaped body of the turntable is embedded and installed in the positioning pit of the push-pull disk, and the four lifting ears of the turntable extend out of the positioning pit of the push-pull disk.

8. The double-barreled syringe capable of avoiding needle liquid residue as claimed in claim 7, characterized in that: The butt joint sleeve A of the turntable and the barrel section of the inner needle barrel are splined and movably plugged; the butt joint sleeve B of the turntable and the rod part of the inner push rod are splined and movably plugged.

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