Syringe

Abstract

The utility model discloses an injector. The piston is movably arranged in the injection tube, the first end of the push rod extends into the injection tube from the first end of the injection tube to be connected with the piston, the needle head is installed through the second end of the injection tube, the first limiting piece is arranged on the push rod, the first limiting structure is arranged in the injection tube, and the elastic piece is arranged between the first limiting piece and the first limiting structure. The elastic piece generates elastic deformation when the push rod moves towards the second end of the injection tube, the locking mechanism is arranged on the injection tube, the locking mechanism limits axial movement of the push rod along the injection tube when the locking mechanism and the push rod are located at a first relative position, and the locking mechanism limits axial movement of the push rod along the injection tube when the locking mechanism and the push rod are located at a second relative position. The limitation on the axial movement of the push rod along the injection tube is relieved, and due to the fact that the push rod can be driven to move through the elastic restoring force of the elastic piece only by adjusting the relative position of the locking mechanism and the push rod, negative pressure capable of sucking the medicine is generated in the injection tube, and therefore the working intensity of medical workers can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a syringe. Background Art

[0002] A syringe is a medical device used to inject medicine into a patient's body. When a nurse is dispensing medicine, they need to use a syringe to draw the medicine. The nurse usually holds the medicine bottle with one hand and the syringe with the other hand, and pulls the piston to draw the medicine into the syringe. Finally, the nurse squeezes the piston to allow the medicine to enter the patient's body.

[0003] However, when a large amount of medicine needs to be injected through the syringe, the piston needs to be pulled frequently, and frequently pulling the piston will make the workload of medical staff very heavy. Therefore, there is an urgent need for a syringe that can automatically draw medicine. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides a syringe to solve the problem of high workload caused by medical staff frequently pulling the piston in existing syringes.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A syringe comprises: an injection tube, a piston, a locking mechanism, a first limiting member, an elastic member and a push rod;

[0007] The piston is movably arranged in the injection tube;

[0008] The first end of the push rod extends from the first end of the injection tube and is connected to the piston, and the second end of the injection tube is used to install the needle;

[0009] The first limiting member is provided on the push rod;

[0010] A first limiting structure is provided in the injection tube;

[0011] The elastic member is disposed between the first limiting member and the first limiting structure, and is used to generate elastic deformation when the push rod moves toward the second end of the injection tube;

[0012] The locking mechanism is arranged on the injection tube. When the locking mechanism and the push rod are in a first relative position, the locking mechanism limits the axial movement of the push rod along the injection tube; when the locking mechanism and the push rod are in a second relative position, the locking mechanism releases the restriction on the axial movement of the push rod along the injection tube.

[0013] Preferably, the elastic member is a spring;

[0014] The spring is sleeved on the push rod.

[0015] Preferably, the injection tube comprises: a mounting head and a barrel;

[0016] The cylinder includes a storage section and an installation section;

[0017] The storage section is used to store medicines;

[0018] The elastic member and the first limiting member are arranged on the installation section;

[0019] The mounting head is located at the first end of the storage section and is used for mounting the needle;

[0020] The installation section is located at the second end of the storage section. The inner diameter of the installation section is larger than the inner diameter of the storage section. A first limiting structure is formed at the connection between the storage section and the installation section.

[0021] Preferably, the locking mechanism comprises: a second limiting member;

[0022] The second limiting member is detachably arranged at the first end of the injection tube, and a through hole for the push rod to pass through is opened in the axial direction of the second limiting member;

[0023] A first protrusion is provided on the inner wall of the through hole;

[0024] Along the length direction of the push rod, a first sliding groove and a second sliding groove are opened on the side wall of the push rod for the first protrusion to pass through, wherein the length of the second sliding groove is smaller than the length of the first sliding groove, and the length of the first sliding groove is the same as the length of the push rod;

[0025] The side wall of the push rod is further provided with a first clamping groove and a second clamping groove, the first end of the second chute is connected to the first chute through the first clamping groove, and the second end of the second chute is connected to the first chute through the second clamping groove;

[0026] When the first protrusion is in the first clamping groove or the second clamping groove, the first protrusion is used to limit the axial movement of the push rod along the injection tube.

[0027] Preferably, the first end of the injection tube is engaged with the second limiting member.

[0028] Preferably, a plurality of bosses are provided on the circumference of the first end of the injection tube;

[0029] A plurality of claws cooperating with the boss are provided along the circumference of the second limiting member.

[0030] Preferably, a limiting protrusion for limiting the claw from falling out is provided on a side of the boss away from the second limiting member.

[0031] Preferably, the push rod is a waist-shaped structure, and has a first plane and a first arc surface;

[0032] The first chute is arranged on the first plane;

[0033] The second sliding groove is arranged on the first arc surface.

[0034] Preferably, the push rod further has a second arc surface;

[0035] A third clamping groove is provided along the circumference of the push rod, and the third clamping groove is located on the first arc surface and the second arc surface;

[0036] The first limiting member is provided with a waist-shaped hole for the push rod to pass through, and the waist-shaped hole is engaged with the third clamping groove;

[0037] A third sliding groove is provided on the inner wall of the injection tube along the axial direction of the injection tube;

[0038] The outer wall of the first limiting member is provided with a second protrusion member that cooperates with the third sliding groove.

[0039] Preferably, it further comprises: a first handle and / or a second handle;

[0040] The first handle is provided at the second end of the push rod;

[0041] The second handle is arranged on the outer wall of the injection tube and is close to the first end of the injection tube.

[0042] Preferably, the method further comprises: the piston is rotatably connected to the push rod via a piston core.

[0043] As can be seen from the above, the utility model discloses a syringe. A piston is movably disposed in a syringe, a first end of a push rod extends from the first end of the syringe and is connected to the piston, and a needle is mounted through the second end of the syringe, a first limiting member is disposed on the push rod, a first limiting structure is disposed in the syringe, an elastic member is disposed between the first limiting member and the first limiting structure, the elastic member is elastically deformed when the push rod moves toward the second end of the syringe, and a locking mechanism is disposed on the syringe. When the locking mechanism and the push rod are in a first relative position, the locking mechanism limits the axial movement of the push rod along the syringe, and when the locking mechanism and the push rod are in a second relative position, the locking mechanism releases the restriction on the axial movement of the push rod along the syringe. The above disclosure is about a syringe. When the syringe of the present application draws medicine, it only needs to adjust the relative position of the locking mechanism and the push rod (i.e., adjust from the first relative position to the second relative position). The elastic restoring force generated by the elastic part can drive the push rod to move, so that a negative pressure that can draw medicine is generated in the injection tube. Compared with the existing syringes, since there is no need for manpower to frequently pull the piston, the workload of medical staff can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0045] Figure 1 A schematic structural diagram of a syringe provided in an embodiment of the present utility model;

[0046] Figure 2 A schematic structural diagram of an injection tube provided in an embodiment of the present utility model;

[0047] Figure 3 A schematic structural diagram of the injection tube provided by an embodiment of the utility model from another angle;

[0048] Figure 4 A schematic structural diagram of a first position-limiting member provided in an embodiment of the present utility model;

[0049] Figure 5 A schematic structural diagram of a second position-limiting member provided in an embodiment of the present utility model;

[0050] Figure 6 A schematic structural diagram of a push rod provided in an embodiment of the present utility model;

[0051] Figure 7 A schematic diagram of the structure of the push rod provided by an embodiment of the utility model from another angle;

[0052] Figure 8 A schematic diagram of the relative positions of the first handle and the second handle before drawing medicine provided by an embodiment of the present invention;

[0053] Figure 9 A cross-sectional view of a syringe provided in an embodiment of the present utility model before drawing medicine;

[0054] Figure 10 A schematic diagram of the relative positions of the first handle and the second handle after the push rod provided by an embodiment of the utility model is rotated;

[0055] Figure 11 A cross-sectional view of a syringe provided in an embodiment of the present invention after drawing medicine;

[0056] Figure 12 A schematic diagram of the relative positions of the first handle and the second handle when injecting medicine with the syringe provided by an embodiment of the utility model;

[0057] Figure 13 This is a cross-sectional view of the syringe provided in an embodiment of the present invention when injecting medicine.

[0058] Among them, the injection tube 1, the mounting head 11, the storage section 121, the mounting section 122, the first limiting structure 13, the boss 14, the limiting protrusion 15, the third slide groove 16; the piston 2; the second limiting member 31, the through hole 311, the first protrusion 312, the claw 32; the first limiting member 4, the waist-shaped hole 41, the second protrusion 42; the elastic member 5; the push rod 6, the first slide groove 61, the second slide groove 62, the first clamping groove 63, the second clamping groove 64, the third clamping groove 65; the first handle 7; the second handle 8; the piston core 9. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0061] The present invention provides a syringe, see Figures 1 to 13 , Figure 1 Schematic diagram of the structure of the syringe, the syringe includes: an injection tube 1, a piston 2, a locking mechanism, a first limiter 4, an elastic member 5 and a push rod 6;

[0062] The piston 2 is movably disposed in the injection tube 1;

[0063] The first end of the push rod 6 extends from the first end of the injection tube 1 and is connected to the piston 2. The second end of the injection tube 1 is used to install the needle.

[0064] The first limiting member 4 is provided on the push rod 6;

[0065] A first limiting structure 13 is provided in the injection tube 1;

[0066] The elastic member 5 is disposed between the first limiting member 4 and the first limiting structure 13. The elastic member 5 is used to generate elastic deformation when the push rod 6 moves toward the second end of the injection tube 1.

[0067] The locking mechanism is arranged on the injection tube 1. When the locking mechanism and the push rod 6 are in a first relative position, the locking mechanism limits the axial movement of the push rod 6 along the injection tube 1; when the locking mechanism and the push rod 6 are in a second relative position, the locking mechanism releases the restriction on the axial movement of the push rod 6 along the injection tube 1.

[0068] It should be noted that the outer wall of the piston 2 of the present application is in sealed contact with the inner wall of the injection tube 1.

[0069] It should also be noted that, since the locking mechanism of the present application is in the second relative position with the push rod 6, the locking mechanism releases the restriction on the axial movement of the push rod 6 along the injection tube 1, and the elastic member 5 can produce elastic deformation when the push rod 6 moves toward the second end of the injection tube 1. Therefore, before the syringe needs to draw medicine (liquid), the push rod 6 is first pushed toward the second end of the injection tube 1 to make the elastic member 5 produce elastic deformation and store energy. When the push rod 6 cannot push the piston 2 to move, the relative position of the locking mechanism and the push rod 6 is adjusted to the first relative position. When it is necessary to draw medicine, the relative position of the locking mechanism and the push rod 6 is adjusted to the second relative position. At this time, the push rod 6 moves toward the first end of the injection tube 1 under the action of the elastic restoring force of the elastic member 5. At the same time, the push rod 6 drives the piston 2 to move toward the first end of the injection tube 1. At this time, the negative pressure generated in the injection tube 1 can draw the medicine.

[0070] In the embodiment of the present utility model, the piston 2 is movably arranged in the injection tube 1, the first end of the push rod 6 extends from the first end of the injection tube 1 and is connected to the piston 2, and the needle is installed through the second end of the injection tube 1, and the first limiting member 4 is arranged on the push rod 6, a first limiting structure 13 is arranged in the injection tube 1, and the elastic member 5 is arranged between the first limiting member 4 and the first limiting structure 13. The elastic member 5 generates elastic deformation when the push rod 6 moves toward the second end of the injection tube 1, and a locking mechanism is arranged on the injection tube 1. When the locking mechanism and the push rod 6 are in a first relative position, the locking mechanism limits the axial movement of the push rod 6 along the injection tube 1. When the locking mechanism and the push rod 6 are in a second relative position, the locking mechanism releases the restriction on the axial movement of the push rod 6 along the injection tube 1. The above disclosure is about a syringe. When the syringe of the present application draws medicine, it only needs to adjust the relative position of the locking mechanism and the push rod 6 (i.e., adjust from the first relative position to the second relative position). The elastic restoring force generated by the elastic member 5 can drive the push rod 6 to move, so that a negative pressure capable of drawing medicine is generated in the injection tube 1. Compared with the existing syringe, since there is no need for manpower to frequently pull the piston 2, the workload of medical staff can be effectively reduced.

[0071] Specifically, the elastic member 5 is a spring;

[0072] The spring is sleeved on the push rod 6 .

[0073] It should be noted that the elastic member 5 can be a spring, a spring, or other components that can produce elastic deformation under the action of external force. Those skilled in the art can choose according to their needs. However, the elastic member 5 of the present application is preferably a spring.

[0074] Furthermore, the injection tube 1 comprises: a mounting head 11 and a barrel;

[0075] The cylinder includes a storage section 121 and a mounting section 122;

[0076] The storage section 121 is used to store medicines;

[0077] The elastic member 5 and the first limiting member 4 are arranged in the mounting section 122;

[0078] The mounting head 11 is located at the first end of the storage section 121 and is used to mount a needle;

[0079] The mounting section 122 is located at the second end of the storage section 121 . The inner diameter of the mounting section 122 is larger than the inner diameter of the storage section 121 . The connection between the storage section 121 and the mounting section 122 forms a first limiting structure 13 .

[0080] It should be noted that the inner diameter of the installation section 122 is set to be larger than the inner diameter of the storage section 121 , so that a step is formed at the connection between the storage section 121 and the installation section 122 , namely the first limiting structure 13 .

[0081] It should also be noted that the outer wall of the piston 2 is in sealed contact with the inner wall of the storage section 121, and the elastic restoring force generated by the elastic member 5 cannot drive the piston 2 to the mounting section 122 by pushing the push rod 6. Therefore, it can effectively prevent the drug from leaking from the gap between the piston 2 and the mounting section 122.

[0082] Specifically, the locking mechanism includes: a second limiting member 31;

[0083] The second limiting member 31 is detachably provided at the first end of the injection tube 1, and a through hole 311 for the push rod 6 to pass through is formed in the axial direction of the second limiting member 31;

[0084] The inner wall of the through hole 311 is provided with a first protrusion 312;

[0085] Along the length direction of the push rod 6, the side wall of the push rod 6 is provided with a first sliding groove 61 and a second sliding groove 62 for the first protrusion 312 to pass through, wherein the length of the second sliding groove 62 is smaller than the length of the first sliding groove 61, and the length of the first sliding groove 61 is the same as the length of the push rod 6;

[0086] The side wall of the push rod 6 is further provided with a first slot 63 and a second slot 64. The first end of the second slot 62 is connected to the first slot 61 through the first slot 63, and the second end of the second slot 62 is connected to the first slot 61 through the second slot 64.

[0087] When the first protrusion 312 is in the first engaging groove 63 or the second engaging groove 64 , the first protrusion 312 is used to limit the axial movement of the push rod 6 along the injection tube 1 .

[0088] It should be noted that by providing a first slide groove 61, a second slide groove 62, a first clamping groove 63 and a second clamping groove 64 on the side wall of the push rod 6, and making the length of the second slide groove 62 smaller than the length of the first slide groove 61, the length of the first slide groove 61 is the same as the length of the push rod 6, and making the first end of the second slide groove 62 connected to the first slide groove 61 through the first clamping groove 63, and the second end of the second slide groove 62 connected to the first slide groove 61 through the second clamping groove 64, when the push rod 6 rotates to the point where the first protrusion 312 of the second limit member 31 is located in the first slide groove 61 or the second slide groove 62, the push rod 6 can move along the axial direction of the injection tube 1, that is, the push rod 6 and the second limit member 31 are in the second relative position, and when the push rod 6 rotates to the point where the first protrusion 312 of the second limit member 31 is located in the first clamping groove 63 or the second clamping groove 64, the push rod 6 cannot move along the axial direction of the injection tube 1, that is, the push rod 6 and the second limit member 31 are in the first relative position.

[0089] It should also be noted that the first slot 63 of the present application is farther away from the second end of the push rod 6 than the second slot 64. By setting the first slide 61, during assembly, the first slide 61 of the push rod 6 is first aligned with the first protrusion 312 of the second limiter 31, and then the push rod 6 is pushed into the injection tube 1. When the first protrusion 312 of the second limiter 31 moves to align with the second slot 64, the push rod 6 is rotated counterclockwise to make the first protrusion 312 of the second limiter 31 snap into the corresponding second slot 64, and the assembly of the push rod 6 and the injection tube 1 is completed, or when the first protrusion 312 of the second limiter 31 is aligned with the second slot 64, the push rod 6 is rotated counterclockwise to make the first protrusion 312 of the second limiter 31 snap into the corresponding second slot 64, and the assembly of the push rod 6 and the injection tube 1 is completed. When the protrusion 312 moves to align with the first slot 63, then rotate the push rod 6 counterclockwise to make the first protrusion 312 of the second limit member 31 snap into the corresponding first slot 63, and then continue to rotate the push rod 6 counterclockwise to make the first protrusion 312 of the second limit member 31 enter the second slide groove 62, and push the push rod 6 into the injection tube 1 again to make the first protrusion of the second limit member 31 slide along the second slide groove 62 until the first protrusion 312 is aligned with the second slot 64, then rotate the push rod 6 clockwise to make the first protrusion 312 snap into the corresponding second slot 64 to complete the assembly of the push rod 6 and the injection tube 1.

[0090] It is worth noting that the second limiter 31 is detachably provided at the first end of the injection tube 1 , which can also effectively prevent the first limiter from falling out of the first end of the injection tube 1 .

[0091] Specifically, the first end of the injection tube 1 is engaged with the second limiting member 31 .

[0092] It should be noted that setting the first end of the injection tube 1 and the second limit member 31 to be snap-fitted can effectively improve the assembly efficiency of the second limit member 31 and the injection tube 1. However, the first end of the injection tube 1 can be assembled with the second limit member 31 by snap-fitting, or can be fixed by other means (threaded connection). Technical personnel in this field can make a choice according to their needs.

[0093] Furthermore, a plurality of bosses 14 are provided around the first end of the injection tube 1;

[0094] A plurality of claws 32 are provided along the circumference of the second limiting member 31 to cooperate with the boss 14 .

[0095] It should be noted that by arranging multiple bosses 14 circumferentially at the first end of the injection tube 1, and arranging multiple claws 32 cooperating with the bosses 14 along the circumference of the second limiting member 31, the second limiting member 31 can be quickly fixed to the injection tube 1 through the cooperation between the claws 32 and the bosses 14.

[0096] Preferably, the distance between adjacent bosses 14 is greater than the width of the claws 32 .

[0097] It should be noted that the spacing between adjacent bosses 14 is set to be greater than the width of the claw 32. During assembly, the claw 32 is first clamped between adjacent bosses 14, and then the second limit member 31 is rotated clockwise or counterclockwise so that multiple bosses 14 are all clamped into the claw 32 to complete the assembly.

[0098] Furthermore, a limiting protrusion 15 for limiting the claw 32 from falling out is provided on a side of the boss 14 away from the second limiting member 31 .

[0099] It should be noted that by providing a limiting protrusion 15 for limiting the escape of the claw 32 on the side of the boss 14 away from the second limiting member 31, the relative displacement of the claw 32 and the boss 14 can be effectively avoided, thereby preventing the second limiting member 31 from separating from the injection tube 1.

[0100] Specifically, the push rod 6 is a waist-shaped structure, and the push rod 6 has a first plane and a first arc surface;

[0101] The first sliding groove 61 is provided on the first plane;

[0102] The second sliding groove 62 is disposed on the first arc surface.

[0103] It should be noted that the push rod 6 can be set to a waist-shaped structure or a conventional cylindrical structure, and those skilled in the art can choose according to their needs.

[0104] Specifically, the push rod 6 also has a second arc surface;

[0105] A third engaging groove 65 is provided along the circumference of the push rod 6 , and the third engaging groove 65 is located on the first arc surface and the second arc surface;

[0106] The first limiting member 4 is provided with a waist-shaped hole 41 for the push rod 6 to pass through, and the waist-shaped hole 41 is engaged with the third slot 65;

[0107] Along the axial direction of the injection tube 1, a third sliding groove 16 is opened on the inner wall of the injection tube 1;

[0108] A second protrusion 42 is provided on the outer wall of the first limiting member 4 to cooperate with the third sliding groove 16 .

[0109] It should be noted that a third slot 65 is provided along the circumference of the push rod 6, and the third slot 65 is located on the first arc surface and the second arc surface, and a waist-shaped hole 41 for the push rod 6 to pass through is provided on the first limit member 4, and the waist-shaped hole 41 is engaged with the third slot 65, so that when the push rod 6 moves along the axial direction of the injection tube 1, it can drive the first limit member 4 to move in the injection tube 1.

[0110] A third slide groove 16 is provided along the axial direction of the injection tube 1 and on the inner wall of the injection tube 1, and a second protrusion 42 is provided on the outer wall of the first limiting member 4 to cooperate with the third slide groove 16, so that during the rotation of the push rod 6, the push rod 6 and the first limiting member 4 can rotate relative to each other.

[0111] It should also be noted that when assembling the first limiting member 4 and the push rod 6, it is necessary to first align the push rod 6 with the waist-shaped hole 41, and then push the push rod 6. When the first limiting member 4 is located in the third slot 65, the waist-shaped hole 41 is inserted into the third slot 65 by rotating the push rod 6, and then the push rod 6 is extended into the injection tube 1, and the second protrusion 42 of the first limiting member 4 is aligned with the third slide groove 16 for assembly.

[0112] Furthermore, the syringe further comprises: a first handle 7 and / or a second handle 8;

[0113] The first handle 7 is provided at the second end of the push rod 6;

[0114] The second handle 8 is disposed on the outer wall of the injection tube 1 and is close to the first end of the injection tube 1 .

[0115] It should be noted that by providing a first handle 7 at the second end of the push rod 6, it is convenient for the staff to push the push rod 6, and by providing a second handle 8 on the outer wall of the injection tube 1 and close to the first end of the injection tube 1, it is also convenient for the staff to grasp the injection tube 1.

[0116] Furthermore, the syringe further comprises: the piston 2 is rotatably connected to the push rod 6 via the piston core 9.

[0117] It should be noted that the piston 2 is rotatably connected to the push rod 6 via the piston core 9, which facilitates the rotation of the push rod 6 relative to the piston 2 and effectively reduces the resistance of the push rod 6 when rotating relative to the injection tube 1.

[0118] Based on the syringe provided in the above embodiment, Figures 1 to 13 For further introduction.

[0119] Before drawing liquid into the syringe: Figure 8 and Figure 9 As shown, the first handle 7 (push rod 6) and the second handle 8 (injection tube 1) of the syringe are in the initial state (the first handle 7 and the second handle 8 are at a 45-degree angle), that is, the push rod 6 and the locking mechanism are in the first relative position, and the spring is compressed.

[0120] Syringe to absorb liquid medicine: Figure 10 and Figure 11 As shown, rotate the push rod 6 counterclockwise by 45 degrees to make the first handle 7 and the second handle 8 perpendicular. At this time, the push rod 6 and the locking mechanism are in the second relative position. The locking mechanism releases the restriction on the axial movement of the push rod 6 along the injection tube 1. The push rod 6 retreats from the injection tube 1 under the elastic restoring force of the spring, so that the syringe can absorb the liquid medicine.

[0121] Syringe injection: Figure 12 and Figure 13 As shown, rotate the push rod 690 degrees clockwise to make the first handle 7 parallel or colinear with the second handle 8. At this time, the second protrusion 42 of the first limit member 4 is in the first slide groove 61, pushing the push rod 6 into the injection tube 1 without overcoming the spring resistance, which is convenient for staff to use.

[0122] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A syringe, characterized in that: include: Injection tube, piston, locking mechanism, first limiting member, elastic member and push rod; The piston is movably arranged in the injection tube; The first end of the push rod extends from the first end of the injection tube and is connected to the piston, and the second end of the injection tube is used to install the needle; The first limiting member is provided on the push rod; A first limiting structure is provided in the injection tube; The elastic member is disposed between the first limiting member and the first limiting structure, and is used to generate elastic deformation when the push rod moves toward the second end of the injection tube; The locking mechanism is arranged on the injection tube. When the locking mechanism and the push rod are in a first relative position, the locking mechanism limits the axial movement of the push rod along the injection tube; when the locking mechanism and the push rod are in a second relative position, the locking mechanism releases the restriction on the axial movement of the push rod along the injection tube.

2. The syringe according to claim 1, characterized in that The elastic member is a spring; The spring is sleeved on the push rod.

3. The syringe according to claim 2, characterized in that The injection tube includes: a mounting head and a barrel; The cylinder includes a storage section and an installation section; The storage section is used to store medicine; The elastic member and the first limiting member are arranged on the installation section; The mounting head is located at the first end of the storage section and is used for mounting a needle; The installation section is located at the second end of the storage section. The inner diameter of the installation section is larger than the inner diameter of the storage section. The first limiting structure is formed at the connection between the storage section and the installation section.

4. The syringe according to claim 1, characterized in that The locking mechanism includes: a second limiting member; The second limiting member is detachably provided at the first end of the injection tube, and a through hole for the push rod to pass through is provided in the axial direction of the second limiting member; The inner wall of the through hole is provided with a first protrusion; Along the length direction of the push rod, a first sliding groove and a second sliding groove are opened on the side wall of the push rod for the first protrusion to pass through, wherein the length of the second sliding groove is smaller than the length of the first sliding groove, and the length of the first sliding groove is the same as the length of the push rod; The side wall of the push rod is further provided with a first clamping groove and a second clamping groove, the first end of the second chute is connected to the first chute through the first clamping groove, and the second end of the second chute is connected to the first chute through the second clamping groove; When the first protrusion is in the first slot or the second slot, the first protrusion is used to limit the axial movement of the push rod along the injection tube.

5. The syringe according to claim 4, characterized in that The first end of the injection tube is engaged with the second limiting member.

6. The syringe according to claim 5, characterized in that A plurality of bosses are provided on the circumference of the first end of the injection tube; A plurality of claws cooperating with the boss are provided along the circumference of the second limiting member.

7. The syringe according to claim 6, characterized in that A limiting protrusion for limiting the claw from falling out is provided on a side of the boss away from the second limiting member.

8. The syringe according to claim 4, characterized in that The push rod is a waist-shaped structure, and has a first plane and a first arc surface; The first chute is arranged on the first plane; The second sliding groove is arranged on the first arc surface.

9. The syringe according to claim 8, characterized in that The push rod also has a second arc surface; A third clamping groove is provided along the circumference of the push rod, and the third clamping groove is located on the first arc surface and the second arc surface; The first limiting member is provided with a waist-shaped hole for the push rod to pass through, and the waist-shaped hole is engaged with the third clamping slot; A third sliding groove is provided on the inner wall of the injection tube along the axial direction of the injection tube; The outer wall of the first limiting member is provided with a second protrusion that cooperates with the third sliding groove.

10. The syringe according to any one of claims 1 to 9, characterized in that Also includes: a first handle and / or a second handle; The first handle is provided at the second end of the push rod; The second handle is disposed on the outer wall of the injection tube and is close to the first end of the injection tube.

11. The syringe according to any one of claims 1 to 9, characterized in that Also includes: The piston is rotatably connected to the push rod through a piston core.

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