Disposable syringe

Abstract

The disposable syringe comprises a needle cylinder, a piston rod, a needle head and a rubber ring, an iron sleeve is arranged at the end, close to the needle cylinder, of the needle head, a cavity layer is formed in the end, close to the interior of the needle cylinder, of the piston rod, a through hole is formed in the piston rod, one end of the through hole is communicated with the cavity layer, and the other end of the through hole is communicated with the outside; a magnet head used for penetrating through the cavity layer to attract the iron sleeve is arranged at the end, located in the cavity layer, of the connecting rod. During injection, liquid medicine in the needle cylinder is injected out through the needle head by pushing the piston rod, after injection is completed, the connecting rod can be pushed to drive the magnet head to penetrate through the cavity layer to be attracted to the iron sleeve, then the connecting rod is pulled towards the side far away from the piston rod, and the magnet head is driven to penetrate through the cavity layer to be attracted to the iron sleeve. The connecting rod can lead the needle head into the through hole through the magnet head, so that the needle head is stored in the through hole, and finally, the needle head can be safely stored after use.

Description

Technical Field

[0001] The invention belongs to the technical field of syringes, and in particular relates to a disposable syringe. Background Art

[0002] A disposable syringe is a disposable syringe whose main purpose is to inject liquids such as medicine or blood to achieve therapeutic effects.

[0003] At present, a Chinese patent with publication number CN202136648U and publication date of February 8, 2012 discloses a disposable syringe, including a needle tube, an outer sleeve, a piston, a core rod and a needle seat. The needle tube is fixed on the needle seat, the needle seat is mounted on the top of the outer sleeve, the core rod is mounted inside the outer sleeve, the piston is mounted on the top of the core rod, the outer surface of the outer sleeve and the needle seat is provided with a layer of black polypropylene material, and the core rod is provided with a scale value.

[0004] The outer side of the needle tube is covered with a needle cover, which needs to be removed during use and can be put on the needle tube again after use to wrap and protect the needle tube; however, when the needle cover is put on, it is easy to cause the needle to prick the operator, thereby causing cross infection due to the needle prick. Summary of the Invention

[0005] The purpose of the present invention is to provide a disposable syringe, which can conveniently and safely store the needle after use.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a disposable syringe, comprising a syringe, a piston rod, a needle, and a rubber ring located on the circumferential side of the piston rod near one end inside the syringe, an iron sleeve is provided at the end of the needle near the syringe, a cavity layer is provided in the end of the piston rod near the syringe, a through hole is provided in the piston rod, one end of which is connected to the cavity layer and the other end is connected to the outside world, a connecting rod is provided in the through hole, and a magnet head is provided at the end of the connecting rod located in the cavity layer for attracting the iron sleeve after penetrating the cavity layer.

[0007] By adopting the above technical solution, during injection, the liquid medicine in the syringe is injected out through the needle by pushing the piston rod. After the injection is completed, the connecting rod can be pushed so that the connecting rod drives the magnet head to penetrate the cavity layer and then be attracted to the iron sleeve. Then, the connecting rod is pulled toward the side away from the piston rod. The connecting rod can introduce the needle into the through hole through the magnet head, thereby storing the needle in the through hole. Finally, the needle can be conveniently and safely stored after use.

[0008] The present invention is further configured as follows: the cross-sectional outer diameter of the iron sleeve is larger than the cross-sectional outer diameter of the needle; a fixing head is provided at one end of the syringe close to the needle; an open groove is provided in the fixing head for the iron sleeve to be embedded; a needle hole is provided on the inner wall of the open groove for the needle to pass through; connecting grooves are provided on both sides of the fixing head close to one end of the syringe; a positioning plate is provided in the connecting groove, one end of which is embedded in the connecting groove and the other end is used to abut against the side of the iron sleeve; a capsule ball is provided at the bottom of the connecting groove to abut against the positioning plate.

[0009] By adopting the above technical solution, when the needle is normally used to puncture the skin, the side of the iron sleeve abuts against the positioning plate, and the position of the iron sleeve in the fixed head can be positioned by the positioning plate and the opening groove, thereby achieving the positioning of the needle and preventing the needle from moving during normal use; When the magnet head enters the fixed head, the magnet head can drive the positioning plates on both sides to move away from each other, and the capsule ball is flattened. Then the magnet head can be easily attracted to the iron sleeve and drive the iron sleeve to leave the opening groove, thereby driving the needle into the through hole.

[0010] The present invention is further configured as follows: glue is contained in the capsule ball, and both sides of the fixing head are provided with a glue injection hole with one end communicating with the bottom of the connecting groove and the other end communicating with the needle hole.

[0011] By adopting the above technical solution, when the capsule ball is subjected to pressure, the capsule ball will rupture and release the glue inside it, and the glue will enter the glue injection hole under the action of the extrusion force. When the needle in the needle hole is pulled out, the glue will flow into the needle hole under the action of its own gravity, and then the needle hole can be sealed by the glue to prevent the drug stains remaining in the syringe and needle from leaking out. At the same time, it can also prevent some volatile residual drug stains from evaporating from the needle hole position and affecting the safety of the external environment.

[0012] The present invention is further configured as follows: a shielding iron cover for embedding the magnet head is provided at one end of the cavity layer close to the needle head, the shielding iron cover is conical in shape and is gap-fitted with the through hole, a rubber film bonded to the inner wall of the cavity layer is bonded to the circumference of the shielding iron cover, an injection hole with an outer diameter equal to the outer diameter of the shielding iron cover is provided at the center of the end face of the syringe close to the needle head, and an inclined portion for fitting on the outer wall of the shielding iron cover is provided on the circumference of the iron sleeve away from the needle head.

[0013] By adopting the above technical solution, when the connecting rod and the magnetic head are pushed toward the cavity layer, the magnetic head will first be embedded in the shielding iron cover, and the shielding iron cover can be attracted and magnetized, and then the shielding iron cover can enter the injection hole under the push of the magnetic head. At this time, since the outer diameter of the injection hole is equal to the outer diameter of the shielding iron cover, the rubber membrane will be subjected to shear force, and then the rubber membrane can be separated from the shielding iron cover, thereby completing the separation of the shielding iron cover from the cavity layer; then, after the shielding iron cover continues to move toward the fixed head, the shielding iron cover can be in contact with the positioning plate, thereby driving the two positioning plates to move toward the side away from each other through the conical shielding iron cover, and then the shielding iron cover can be attracted on the iron sleeve, and the shielding iron cover is attached to the inclined portion of the iron sleeve; Then the connecting rod can be pulled toward the side away from the fixed head, and the connecting rod can drive the needle and the iron sleeve into the through hole through the magnetic head and the shielding iron cover, and finally the needle can be safely stored after use.

[0014] The present invention is further configured as follows: an internal threaded ring is provided on the inner wall of the end face of the syringe close to the needle head, an external threaded surface for threaded connection in the internal threaded ring is provided on the end face of the piston rod close to the rubber ring, a pressure plate is provided at the end of the piston rod away from the rubber ring, a threaded hole is provided at the center of the pressure plate, a threaded end threadedly connected in the threaded hole is provided at the end of the connecting rod away from the magnet head, and a knob is provided at the end of the threaded end away from the connecting rod.

[0015] By adopting the above technical solution, when the piston rod moves toward the syringe and squeezes the liquid medicine, the external thread surface of the piston rod abuts against the internal thread ring, and the injection process of the liquid medicine is completed; then the piston rod can be rotated so that the external thread surface is threadedly connected to the internal thread ring, thereby completing the fixed connection of the piston rod in the syringe, thereby preventing the piston rod from separating from the syringe. Then, by turning the knob, the connecting rod and the threaded end can be driven to rotate, and the threaded end can be rotated in the threaded hole to drive the connecting rod to move toward the side close to the fixed head, which is conducive to driving the shielding iron cover to separate from the rubber membrane and the cavity layer.

[0016] The present invention is further configured as follows: a guide sleeve portion is provided on the inner wall of the circumference of the through hole and is fitted on the outer wall of the connecting rod.

[0017] By adopting the above technical solution, the guide sleeve provided on the inner wall of the through hole and attached to the outer wall of the connecting rod can guide the movement of the connecting rod in the through hole.

[0018] The present invention is further configured as follows: a shielding iron ring is provided on the circumferential side of the shielding iron cover for wrapping around the circumferential side of the magnet head; a damping rubber sleeve is provided on the circumferential inner wall of the shielding iron ring, which is pressed against the outer wall of the magnet head; and a needle hole is provided on the circumferential outer wall of the piston rod near one end of the rubber ring, which is connected to the through hole and for the needle to pass through.

[0019] By adopting the above technical solution, when the magnet head uses the shielding iron cover to drive the needle into the through hole, until the shielding iron cover moves to the position of the guide sleeve, the guide sleeve can locate the position of the shielding iron cover, and as the magnet head continues to move toward the side away from the fixed head, the magnet head can be separated from the shielding iron cover, and the magnet head enters the shielding iron ring. At this time, a gap can be generated between the shielding iron cover and the magnet head, so the magnetization of the shielding iron cover is cancelled. At the same time, the iron shielding iron cover can shield the magnetic attraction of the magnet head. Subsequently, after losing the magnetic attraction of the magnet head, the iron sleeve and the needle can fall off from the shielding iron cover under the action of their own gravity, and then the needle can pass through the needle row port and enter the cavity between the syringe and the piston rod, and finally the needle can be conveniently and safely stored after use. Then the connecting rod can move toward the side close to the fixed head. At this time, since the magnetic head located in the shielding iron ring is pressed tightly by the damping rubber sleeve, the magnetic head will not fit on the shielding iron cover when pushing the shielding iron cover to move toward the side close to the fixed head. At this time, the shielding iron cover and the shielding iron ring can play a role in shielding the magnetic field of the magnetic head moving toward the side close to the fixed head, thereby preventing the magnetic attraction force of the magnet head from again attracting the needle located in the cavity between the syringe and the piston rod. Finally, the connecting rod can be easily retracted into the through hole, thereby preventing an excessively long syringe from occupying too much storage space.

[0020] The present invention is further configured as follows: a barrier ring is provided on the inner wall of the peripheral side of the end of the syringe away from the needle head, which is in clearance fit with the piston rod.

[0021] By adopting the above technical solution, a barrier ring is provided on the inner wall of the side of the syringe away from the needle end, which is matched with the clearance of the piston rod. The barrier ring can play a blocking and limiting role on the needle in the cavity between the syringe and the piston rod, thereby preventing the needle from passing through the end of the syringe.

[0022] The present invention is further configured such that the end surface of the magnet head away from one end of the connecting rod is in a conical shape for use in conjunction with the shielding iron cover.

[0023] By adopting the above technical solution, the end surface of the magnet head away from the connecting rod is in a conical shape for use with the shielding iron cover, which is conducive to the magnet head stably driving the shielding iron cover to move.

[0024] The beneficial effects of the present invention are as follows: when the syringe is performing normal injection, the liquid medicine in the syringe is injected out through the needle by pushing the piston rod, and the injection process of the liquid medicine is completed after the external thread surface of the piston rod abuts against the internal thread ring. At the same time, the side of the iron sleeve abuts against the positioning plate, and the position of the iron sleeve in the fixed head can be positioned by the positioning plate and the opening groove, thereby realizing the positioning of the needle and preventing the needle from moving during normal use. After the injection of the syringe is completed, the piston rod is first rotated so that the outer thread surface is threadedly connected to the inner thread ring, thereby completing the fixed connection of the piston rod in the syringe; then the connecting rod and the threaded end can be driven to rotate by turning the knob, and the threaded end can be rotated in the threaded hole, thereby driving the connecting rod to move toward the side close to the fixed head; and after the connecting rod and the magnetic head are directed into the cavity layer, the magnetic head will first be embedded in the shielding iron cover, and the shielding iron cover can be attracted and magnetized, and then the shielding iron cover can enter the injection hole under the push of the magnetic head. At this time, since the outer diameter of the injection hole is equal to the outer diameter of the shielding iron cover, the rubber membrane will be subjected to shear force, and then the rubber membrane can be separated from the shielding iron cover, thereby completing the separation of the shielding iron cover from the cavity layer; then after the shielding iron cover continues to move toward the fixed head, the shielding iron cover can contact the positioning plate, thereby driving the two positioning plates to move toward the side away from each other through the conical shielding iron cover, and then the shielding iron cover can be attracted on the iron sleeve, and the shielding iron cover fits on the inclined portion of the iron sleeve; The guide sleeve can then position the shielding iron cover, and as the magnet head continues to move toward the side away from the fixed head, the magnet head can be separated from the shielding iron cover, and the magnet head enters the shielding iron ring. At this time, a gap can be generated between the shielding iron cover and the magnet head, so the magnetization of the shielding iron cover is cancelled, and the iron shield can shield the magnetic attraction of the magnet head. Subsequently, after losing the magnetic attraction of the magnet head, the iron cover and the needle can fall off from the shielding iron cover under the action of their own gravity, and then the needle can pass through the needle row port and enter the cavity between the syringe and the piston rod, and finally the needle can be safely stored after use. Then the connecting rod can be moved toward the side close to the fixed head. At this time, because the magnetic head located in the shielding iron ring is pressed tightly by the damping rubber sleeve, the magnetic head will not fit on the shielding iron cover when pushing the shielding iron cover to move toward the side close to the fixed head. At this time, the shielding iron cover and the shielding iron ring can play a role of magnetic field shielding for the magnetic head moving toward the side close to the fixed head, thereby preventing the magnetic attraction of the magnet head from again attracting the needle located in the cavity between the syringe and the piston rod. Finally, the connecting rod can be easily retracted into the through hole, thereby preventing an overly long syringe from occupying too much storage space. When the two positioning plates move away from each other due to the thrust of the shielding iron cover, the capsule ball will be squeezed and ruptured, thereby releasing the glue inside. The glue will enter the glue injection hole under the action of the squeezing force. When the needle in the pinhole is pulled out, the glue will flow into the pinhole under the action of its own gravity, and then the pinhole can be sealed by the glue to prevent the drug stains remaining in the syringe and needle from leaking out. At the same time, it can also prevent some volatile residual drug stains from evaporating from the pinhole position and affecting the safety of the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a cross-sectional view of the structure of the present invention, when the syringe is performing normal injection; Figure 2 This is a partial structural cross-sectional view of the present invention, when the syringe is performing normal injection; Figure 3 This is a cross-sectional view of the structure of the present invention. At this time, when the connecting rod is pushed toward the side close to the fixed head, the two positioning plates are driven to move away from each other through the conical shielding iron cover, and then the shielding iron cover is attracted to the iron sleeve; Figure 4 This is a partial structural cross-sectional view of the present invention. At this time, the shielding iron cover is attracted to the iron sleeve, and the capsule ball is squeezed and ruptured, thereby releasing the glue inside. The glue enters the glue injection hole under the action of the squeezing force. Figure 5 This is a cross-sectional view of the structure of the present invention. At this time, the connecting rod moves toward the side away from the fixed head, and the connecting rod drives the needle head and the iron sleeve into the through hole through the magnetic head and the shielding iron cover; Figure 6 This is a cross-sectional view of the structure of the present invention. At this time, the shielding iron cover plays a shielding role on the magnetic attraction of the magnet head. After the magnetic attraction of the magnet head is lost, the iron sleeve and the needle fall off from the shielding iron cover under the action of their own gravity. The needle passes through the needle row port and enters the cavity between the syringe and the piston rod; Figure 7 This is a structural cross-sectional view of the present invention. At this time, the connecting rod moves toward the side close to the fixed head, and the shielding iron cover and the shielding iron ring play a role in shielding the magnetic field of the magnet head moving toward the side close to the fixed head, so that the connecting rod retracts into the through hole.

[0027] In the figure, 1. syringe; 11. injection hole; 12. internal thread ring; 13. barrier ring; 2. piston rod; 21. rubber ring; 22. cavity layer; 23. through hole; 231. guide sleeve; 24. external thread surface; 25. pressure plate; 251. threaded hole; 26. needle port; 3. needle; 31. iron sleeve; 311. inclined portion; 4. connecting rod; 41. magnet head; 42. threaded end; 421. knob; 5. fixing head; 51. opening slot; 52. needle hole; 53. connecting slot; 54. positioning plate; 55. capsule ball; 56. glue injection hole; 6. shielding iron cover; 61. rubber membrane; 62. shielding iron ring; 621. damping rubber sleeve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0029] A disposable syringe, Figure 1 、 Figure 2 The disposable syringe comprises a syringe 1, a piston rod 2, a needle 3, and a rubber ring 21, wherein the piston rod 2 is embedded in the syringe 1, and the needle 3 is located at one end of the syringe 1, and the rubber ring 21 is bonded to the circumference of the piston rod 2 near the inner end of the syringe 1; and an iron sleeve 31 is welded to the end of the needle 3 near the syringe 1, and the iron sleeve 31 is made of iron material, and the cross-sectional outer diameter of the iron sleeve 31 is larger than the cross-sectional outer diameter of the needle 3, and a fixed head 5 is bonded to the end of the syringe 1 near the needle 3, and an opening for the iron sleeve 31 to be embedded is opened in the fixed head 5 Groove 51, wherein a needle hole 52 for the needle 3 to pass through is provided on the inner wall of the open groove 51, and connecting grooves 53 are provided on both sides of the fixed head 5 near one end of the syringe 1, and a positioning plate 54 with one end embedded in the connecting groove 53 and the other end used to abut against the side of the iron sleeve 31 is provided in the connecting groove 53, and a capsule ball 55 is embedded in the bottom of the connecting groove 53 and abuts against the positioning plate 54, and glue is contained in the capsule ball 55, and glue injection holes 56 are provided on both sides of the fixed head 5, one end of which is connected with the bottom of the connecting groove 53 and the other end is connected with the needle hole 52.

[0030] Reference Figure 1 、 Figure 2An internal threaded ring 12 is integrally provided on the inner wall of the end face of the syringe 1 near the needle head 3, and an external threaded surface 24 for threaded connection to the internal threaded ring 12 is provided on the inner side of the end face of the piston rod 2 near the rubber ring 21; a cavity layer 22 is provided in the end of the piston rod 2 near the syringe 1, and a through hole 23 is provided in the piston rod 2, one end of which is connected to the cavity layer 22 and the other end of which is connected to the outside world, wherein a connecting rod 4 is provided in the through hole 23, and a guide sleeve portion 231 is integrally provided on the inner wall of the through hole 23 and is attached to the outer wall of the connecting rod 4.

[0031] Reference Figure 2 The connecting rod 4 is bonded with a magnet head 41 at one end of the cavity layer 22, and a shielding iron cover 6 for embedding the magnet head 41 is provided at one end of the cavity layer 22 close to the needle head 3, and the shielding iron cover 6 is made of iron material, wherein the shielding iron cover 6 is conical and has a clearance fit with the through hole 23, and the circumference of the shielding iron cover 6 is bonded with a rubber film 61 bonded to the inner wall of the cavity layer 22, and at the same time, a diameter equal to the shielding iron cover is provided at the center of the end face of the syringe 1 close to the needle head 3. 6 outer diameter of the injection hole 11, and the iron sleeve 31 away from the needle 3 side of the end is provided with a slope 311 for fitting on the outer wall of the shielding iron cover 6, wherein the end face of the magnet head 41 away from the connecting rod 4 is conical for use with the shielding iron cover 6; at the same time, the shielding iron cover 6 is integrally provided with a shielding iron ring 62 for wrapping around the magnet head 41, and the inner wall of the shielding iron ring 62 is bonded with a damping rubber sleeve 621 that presses against the outer wall of the magnet head 41.

[0032] Reference Figure 1 A pressure plate 25 is bonded and fixed to the end of the piston rod 2 away from the rubber ring 21, and a threaded hole 251 is provided at the center of the pressure plate 25, wherein the end of the connecting rod 4 away from the magnet head 41 is integrally provided with a threaded end 42 threadedly connected to the threaded hole 251, and the cross-sectional outer diameter of the threaded end 42 is larger than the cross-sectional outer diameter of the connecting rod 4, and at the same time, a knob 421 is integrally provided at the end of the threaded end 42 away from the connecting rod 4; wherein a needle hole 26 communicating with the through hole 23 and for the needle 3 to pass through is provided on the outer wall of the peripheral side of the piston rod 2 close to the rubber ring 21, and a barrier ring 13 that is clearance-matched with the piston rod 2 is integrally provided on the inner wall of the peripheral side of the syringe 1 away from the needle 3.

[0033] Principle: When the syringe is performing normal injection (refer to Figure 1), by pushing the piston rod 2, the liquid medicine in the syringe 1 is injected through the needle 3, and the injection process of the liquid medicine is completed after the external thread surface 24 of the piston rod 2 abuts against the internal thread ring 12. At the same time, the side of the iron sleeve 31 abuts against the positioning plate 54. The position of the iron sleeve 31 in the fixed head 5 can be positioned by the positioning plate 54 and the opening groove 51, thereby achieving the positioning of the needle 3 and preventing the needle 3 from moving during normal use; After the injection is completed (refer to Figure 3 、 Figure 4 ), first rotate the piston rod 2 so that the external threaded surface 24 is threadedly connected to the internal threaded ring 12, thereby completing the fixed connection of the piston rod 2 in the syringe 1; then, by turning the knob 421, the connecting rod 4 and the threaded end 42 can be driven to rotate, and the threaded end 42 can be rotated in the threaded hole 251, thereby driving the connecting rod 4 to move toward the side close to the fixed head 5; and after the connecting rod 4 and the magnetic head 41 are directed toward the cavity layer 22, the magnetic head 41 will first be embedded in the shielding iron cover 6, and the shielding iron cover 6 can be attracted and magnetized, and then the shielding iron cover 6 can enter under the push of the magnetic head 41. In the injection hole 11, at this time, since the outer diameter of the injection hole 11 is equal to the outer diameter of the shielding iron cover 6, the rubber membrane 61 will be subjected to shear force, and then the rubber membrane 61 can be separated from the shielding iron cover 6, thereby completing the separation of the shielding iron cover 6 from the cavity layer 22; then, after the shielding iron cover 6 continues to move toward the fixed head 5, the shielding iron cover 6 can be abutted against the positioning plate 54, thereby driving the two positioning plates 54 to move toward the side away from each other through the conical shielding iron cover 6, and then the shielding iron cover 6 can be attracted to the iron sleeve 31, and the shielding iron cover 6 is attached to the inclined portion 311 of the iron sleeve 31; Reference Figure 5 、 Figure 6 , then the knob 421 can be rotated in the opposite direction to pull the connecting rod 4 toward the side away from the fixed head 5, and the connecting rod 4 can drive the needle 3 and the iron sleeve 31 into the through hole 23 through the magnetic head 41 and the shielding iron cover 6, until the shielding iron cover 6 moves to the position of the guide sleeve 231, and the guide sleeve 231 can locate the position of the shielding iron cover 6. As the magnetic head 41 continues to move toward the side away from the fixed head 5, the magnetic head 41 can be separated from the shielding iron cover 6, and the magnetic head 41 enters the shielding iron ring 62 At this time, a gap is generated between the shielding iron cover 6 and the magnetic head 41, so the magnetization of the shielding iron cover 6 is cancelled. At the same time, the iron shielding iron cover 6 can shield the magnetic attraction of the magnetic head 41. Then, after losing the magnetic attraction of the magnetic head 41, the iron sleeve 31 and the needle 3 can fall off from the shielding iron cover 6 under the action of their own gravity. Then, the needle 3 can pass through the needle row port 26 and enter the cavity between the syringe 1 and the piston rod 2. Finally, the needle 3 can be safely stored after use. Reference Figure 7, then the connecting rod 4 can move toward the side close to the fixed head 5. At this time, since the magnetic head 41 located in the shielding iron ring 62 is pressed tightly by the damping rubber sleeve 621, the magnetic head 41 will not fit on the shielding iron cover 6 when pushing the shielding iron cover 6 to move toward the side close to the fixed head 5. At this time, the shielding iron cover 6 and the shielding iron ring 62 can play a magnetic field shielding role for the magnetic head 41 moving toward the side close to the fixed head 5, preventing the magnetic attraction force of the magnetic head 41 from again attracting the needle 3 located in the cavity between the syringe 1 and the piston rod 2, and finally the connecting rod 4 can be easily retracted into the through hole 23, avoiding that an overly long syringe takes up too much storage space; Reference Figure 3 、 Figure 4 When the two positioning plates 54 move toward the side away from each other due to the thrust of the shielding iron cover 6, the capsule ball 55 can be squeezed, and the capsule ball 55 ruptures to release the glue inside. The glue can enter the glue injection hole 56 under the action of the squeezing force. When the needle 3 in the needle hole 52 is pulled out, the glue can flow toward the needle hole 52 under the action of its own gravity, and then the needle hole 52 can be sealed by the glue to prevent the drug stains remaining in the syringe 1 and the needle 3 from leaking out. At the same time, it can also prevent some volatile residual drug stains from evaporating from the needle hole 52 and affecting the safety of the external environment.

Claims

1. A disposable syringe comprising a syringe (1), a piston rod (2), a needle (3), and a rubber ring (21) located on the circumferential side of the piston rod (2) near one end of the syringe (1), characterized in that: An iron sleeve (31) is provided at one end of the needle head (3) close to the syringe (1), a cavity layer (22) is provided in one end of the piston rod (2) close to the syringe (1), a through hole (23) is provided in the piston rod (2), one end of which is in communication with the cavity layer (22) and the other end of which is in communication with the outside world, a connecting rod (4) is provided in the through hole (23), and a magnet head (41) is provided at one end of the connecting rod (4) located in the cavity layer (22) for attracting the iron sleeve (31) after penetrating the cavity layer (22).

2. A disposable syringe according to claim 1, characterized in that: The outer diameter of the cross section of the iron sleeve (31) is larger than the outer diameter of the cross section of the needle (3); a fixed head (5) is provided at one end of the syringe (1) close to the needle (3); an opening groove (51) is provided in the fixed head (5) for the iron sleeve (31) to be embedded; a needle hole (52) is provided on the inner wall of the opening groove (51) for the needle (3) to pass through; connecting grooves (53) are provided on both sides of the fixed head (5) close to one end of the syringe (1); a positioning plate (54) is provided in the connecting groove (53) with one end embedded in the connecting groove (53) and the other end used to abut against the side of the iron sleeve (31); a capsule ball (55) is provided at the bottom of the connecting groove (53) to abut against the positioning plate (54).

3. A disposable syringe according to claim 2, characterized in that: The capsule ball (55) contains glue, and both sides of the fixed head (5) are provided with a glue injection hole (56) with one end communicating with the bottom of the connecting groove (53) and the other end communicating with the needle hole (52).

4. The disposable syringe according to claim 1, characterized in that: A shielding iron cover (6) for embedding the magnet head (41) is provided at one end of the cavity layer (22) close to the needle head (3), the shielding iron cover (6) is conical and has a clearance fit with the through hole (23), a rubber film (61) bonded to the inner wall of the cavity layer (22) is bonded to the peripheral side of the shielding iron cover (6), and a liquid injection hole (11) with an outer diameter equal to the outer diameter of the shielding iron cover (6) is provided at the center of the end face of the syringe (1) close to the needle head (3), and an inclined portion (311) for fitting on the outer wall of the shielding iron cover (6) is provided on the peripheral side of the iron sleeve (31) away from the needle head (3).

5. A disposable syringe according to claim 4, characterized in that: An internal threaded ring (12) is provided on the inner wall of the end surface of the syringe (1) close to the needle head (3); an external threaded surface (24) for threaded connection to the internal threaded ring (12) is provided on the circumferential side of the end surface of the piston rod (2) close to the rubber ring (21); a pressing plate (25) is provided at the end of the piston rod (2) away from the rubber ring (21); a threaded hole (251) is provided at the center of the pressing plate (25); a threaded end (42) threadedly connected to the threaded hole (251) is provided at the end of the connecting rod (4) away from the magnet head (41); and a knob (421) is provided at the end of the threaded end (42) away from the connecting rod (4).

6. A disposable syringe according to claim 5, characterized in that: A guide sleeve portion (231) is provided on the inner wall of the circumference of the through hole (23) and is fitted on the outer wall of the connecting rod (4).

7. A disposable syringe according to claim 6, characterized in that: The shielding iron cover (6) is provided with a shielding iron ring (62) for wrapping around the magnet head (41) on its circumferential side, and a damping rubber sleeve (621) is provided on the inner wall of the circumferential side of the shielding iron ring (62) and is pressed against the outer wall of the magnet head (41). The outer wall of the circumferential side of the piston rod (2) near the rubber ring (21) is provided with a needle hole (26) that is connected to the through hole (23) and for the needle (3) to pass through.

8. The disposable syringe according to claim 6, characterized in that: A barrier ring (13) is provided on the inner wall of the peripheral side of the end of the syringe (1) away from the needle head (3) and is clearance-matched with the piston rod (2).

9. The disposable syringe according to claim 4, characterized in that: The end surface of the magnetic head (41) away from one end of the connecting rod (4) is in a conical shape for use with the shielding iron cover (6).

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