syringe

Abstract

This application relates to a syringe. It includes a housing, an injection plunger, an adjustment knob, a dosage scale ring, a plunger sleeve, a scale ring support, a support reset elastic element, a torque elastic element, and an injection button. The injection plunger has a first external thread on its outer surface, and the housing has a first internal thread at its distal end. The adjustment knob is used to set the dosage. The dosage scale ring indicates the dosage to be injected and rotates helically with the adjustment knob. The plunger sleeve rotates with the adjustment knob. The scale ring support has a first end-face toothed ring at its proximal end and is circumferentially linked to the plunger sleeve at its distal end. The housing has a second end-face toothed ring at its proximal end. The support reset elastic element maintains the engagement of the first and second end-face toothed rings. In the dosage setting state, the torque elastic element is twisted by the rotation of the adjustment knob. The injection button moves axially distally, and the syringe enters the injection state. This application's technical solution reduces the cost of the syringe.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a syringe. Background Technology

[0002] A syringe is a common medical device. The principle of the syringe was understood as early as the 15th century. It primarily uses a needle to draw or inject gas or liquid. Syringes can also be used in medical devices and as drug containers, such as in some chromatographic instruments where injection is performed through a rubber diaphragm. A syringe consists of a syringe barrel with a small hole at the front and a matching piston rod. It is used to inject or withdraw small amounts of liquid or other substances into areas inaccessible by other methods. When the piston rod is pulled out, the liquid or gas is drawn in through the small hole at the front of the syringe barrel; when the piston rod is pushed in, the liquid or gas is expelled.

[0003] For diabetic patients, artificial insulin is administered via subcutaneous injection. To prevent contamination, the insulin is contained in a specially designed vial with a plunger at one end. During injection, the syringe pushes the plunger, squeezing the insulin out through the needle and into the body. Since the dosage varies among different diabetic patients, the syringe needs a precisely controlled dosage mechanism. However, current syringes for precise dosage control suffer from complex structures and high manufacturing costs. Summary of the Invention

[0004] In view of this, the present application provides a syringe to solve at least one problem existing in the background art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] This application provides a syringe, including a shell, an injection plunger, an adjustment knob, a dosage scale ring, a plunger sleeve, a scale ring support, a support reset elastic element, a torque elastic element, and an injection button, and includes two working states: setting the dosage and injection.

[0007] The shell has a cavity with openings at both ends, including a distal end connected to the drug container and a proximal end opposite to it.

[0008] The injection plunger is located inside the cavity and is used to push the piston inside the drug container to move during the injection process; the outer surface of the injection plunger has a first external thread, and the distal end of the housing is provided with a first internal thread that matches the first external thread; during the injection process, the injection plunger is driven to rotate and forms a helical motion through the cooperation of the first external thread and the first internal thread.

[0009] The adjustment knob is used to set the dosage. When the syringe is rotated in a first direction around the axis of the injection plunger, the syringe enters the working state of setting the dosage.

[0010] The dosage scale ring is used to indicate the dosage to be injected and can rotate spirally in response to the rotation of the adjustment knob;

[0011] The push rod sleeve can rotate in response to the rotation of the adjustment knob; in the working state of setting the dosage, the push rod sleeve is circumferentially linked with the dosage scale ring; in the working state of injection, the push rod sleeve is circumferentially linked with the injection push rod and the dosage scale ring.

[0012] The scale ring bracket is used to transmit the torque of the push rod sleeve to the dosage scale ring; the proximal end of the scale ring bracket is provided with a first end face toothed ring, and the distal end is circumferentially linked with the push rod sleeve; the proximal end of the housing is provided with a second end face toothed ring that meshes with the first end face toothed ring.

[0013] The bracket reset elastic element is used to maintain the meshing state of the first end face gear ring and the second end face gear ring, and abuts axially with the push rod sleeve;

[0014] The proximal end of the torsion elastic element is connected to the housing, and the distal end is connected to the scale ring bracket; in the working state of setting the dosage, the torsion elastic element is torsionally stored during the rotation of the adjustment knob;

[0015] The injection button axially abuts against the push rod sleeve; the injection button moves axially to the distal end, and the syringe enters the injection working state; the injection button drives the push rod sleeve to move axially, compressing the bracket reset elastic element, so that the first end face toothed ring and the second end face toothed ring disengage from the meshing state, and the scale ring bracket rotates in the second direction under the torque of the torque elastic element; driving the push rod sleeve to rotate, thereby driving the injection push rod to perform a spiral descent motion for injection.

[0016] Optionally, the syringe also includes:

[0017] A push rod drive is rotatably mounted on the inner wall at the distal end of the housing; in the injection working state, the push rod drive is circumferentially linked with the push rod sleeve and the injection push rod to establish circumferential linkage between the push rod sleeve and the injection push rod.

[0018] Optionally, the meshing edges of the teeth of the first end face gear ring and the second end face gear ring are asymmetrical on both sides, so that the rotational resistance of the scale ring bracket in the first direction is less than the rotational resistance in the second direction.

[0019] Optionally, the syringe further includes:

[0020] The first sound-generating device includes a first sound-generating structure and a second sound-generating structure that cooperate with each other; the first sound-generating structure is disposed at the proximal end of the dosage scale ring and includes a first groove and an inclined surface extending to the first groove; the second sound-generating structure is disposed at the proximal end of the housing and includes a first protrusion that matches the first groove; in the injection working state, the dosage scale ring rotates spirally until the first protrusion passes the inclined surface and enters the first groove.

[0021] Optionally, the syringe further includes:

[0022] A dose accumulation ring is installed on the inner wall of the push rod sleeve and fitted onto the injection push rod. In the dose setting operation, the rotation of the push rod sleeve drives the dose accumulation ring to spiral towards the proximal end until the top of the dose accumulation ring abuts against the injection push rod and can no longer spiral upwards. In the injection operation, the dose accumulation ring remains axially stationary. When setting the dose, the spiral stroke of the dose accumulation ring on the injection push rod corresponds to the amount of drug remaining in the drug container.

[0023] Optionally, a first stop is provided at the distal end of the inner wall of the housing to limit the distal position of the dose scale ring during the dose setting operation, thereby limiting the setting of the single injection dose.

[0024] Optionally, the dose scale ring has a circumferential second groove at its proximal end, and the housing has a second protrusion that inserts into the second groove to limit the axial position of the dose scale ring at the zero mark.

[0025] Optionally, the torsional elastic element is a torsion spring, and the inner wall of the housing is provided with a hook groove for accommodating the hook of the torsion spring; the radial width of the hook groove is greater than the radial width of the hook.

[0026] Optionally, the circumferential length of the hook groove abutting the inner wall of the hook is shorter than the circumferential length of the hook, so that the hook does not contact the housing at the opening of the hook groove.

[0027] Optionally, the housing includes a tube and a first end ring, the first end ring being fixed to the inner wall of the proximal end of the tube; a second end face toothed ring is provided at the distal end of the first end ring.

[0028] Optionally, the housing further includes a second end ring, which is fixed to the inner wall of the distal end of the tube; the second end ring is provided with the first internal thread.

[0029] Optionally, the inner wall of the distal end of the tube is provided with a third groove, which extends axially; the outer wall of the second end ring is provided with a third protrusion that cooperates with the third groove to limit the circumferential position of the second end ring.

[0030] Optionally, the distal end of the tube is provided with a fourth groove that mates with the drug container to restrict the circumferential position of the drug container.

[0031] Optionally, the dosage scale ring includes scale markings, the scale markings including venting marks; the venting marks are between the zero mark and the maximum mark.

[0032] The syringe of this embodiment maintains the stable position of the dosage scale ring during dosage setting by providing a first end-face toothed ring on the scale ring bracket, a second end-face toothed ring on the housing, and a bracket reset elastic element. This eliminates the need for complex structures such as ratchet arm assemblies, simplifying the syringe structure. Therefore, the syringe of this embodiment simplifies the syringe structure and reduces the cost of the syringe.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of the appearance of the syringe provided in the embodiments of this application;

[0036] Figure 2 for Figure 1 A sectional view;

[0037] Figure 3 for Figure 2 A diagram showing the disassembled drug container;

[0038] Figure 4 An exploded view (disassembled view) of the syringe provided in an embodiment of this application;

[0039] Figure 5 A schematic diagram of the main components of the syringe provided in the embodiments of this application;

[0040] Figure 6 A schematic diagram of the injection plunger and dose accumulation ring in a syringe provided in an embodiment of this application;

[0041] Figure 7A schematic diagram of the adjustment knob in the syringe provided in the embodiments of this application;

[0042] Figure 8 A schematic diagram of the plunger sleeve in the syringe provided in the embodiments of this application;

[0043] Figure 9 A schematic diagram of a dosage scale ring in a syringe provided in an embodiment of this application;

[0044] Figure 10 A schematic diagram of the graduated ring support in the syringe provided in the embodiments of this application;

[0045] Figure 11 A schematic diagram of the torsional elastic element in the syringe provided in the embodiments of this application;

[0046] Figure 12 A schematic diagram of the plunger drive component in the syringe provided in an embodiment of this application;

[0047] Figure 13 A schematic diagram of the first end ring in a syringe provided in an embodiment of this application;

[0048] Figure 14 A schematic diagram of the tube in a syringe provided in an embodiment of this application;

[0049] Figure 15 A schematic diagram of the dosage scale ring and the first end ring in the syringe provided in the embodiments of this application;

[0050] Figure 16 for Figure 15 A magnified view of a portion of the central structure;

[0051] Figure 17 An assembly diagram of the first end ring and the torsion elastic element in the syringe provided in the embodiments of this application;

[0052] Figure 18 A schematic diagram of the second end ring in the syringe provided in the embodiments of this application;

[0053] Figure 19 A schematic diagram of another perspective of the tube in the syringe provided in an embodiment of this application;

[0054] Figure 20 A schematic diagram showing the connection between the plunger sleeve and the injection button in a syringe provided in an embodiment of this application;

[0055] Figure 21 for Figure 20 A magnified view of a portion of point A in the middle;

[0056] Figure 22Another schematic diagram of the dosage scale ring in the syringe provided in the embodiments of this application.

[0057] Explanation of reference numerals in the attached figures:

[0058] 10. Shell; 11. Tube body; 111. Third groove; 112. Fourth groove; 113. Second internal thread; 12. First end ring; 121. Second end face gear ring; 122. First protrusion; 123. Hook groove; 124. Second protrusion; 125. Snap protrusion; 13. Second end ring; 131. First internal thread; 14. Snap groove; 15. Viewing window; 16. First stop block;

[0059] 20. Injection plunger; 21. First external thread; 22. Plunger drive component; 221. Fourth external protrusion; 222. First inner plane; 23. First outer plane; 24. Dose accumulation ring; 241. Circumferential linkage protrusion; 25. Second stop;

[0060] 30. Adjustment knob; 31. First inner protrusion;

[0061] 40. Dosage scale ring; 41. Scale ring bracket; 411. Second inner protrusion; 412. First end face toothed ring; 413. Third outer protrusion; 42. Bracket reset elastic element; 43. Second external thread; 44. Third inner protrusion; 45. First groove; 46. Inclined surface; 47. Second groove; 48. Exhaust mark;

[0062] 50. Push rod sleeve; 51. First external protrusion; 52. Second external protrusion; 53. Fourth internal protrusion; 54. Circumferential linkage groove; 55. Stepped hole;

[0063] 60. Torsional elastic element; 61. Hook;

[0064] 70. Injection button; 71. Barb; 72. Button return spring;

[0065] 80. Medicine container; 81. Piston. Detailed Implementation

[0066] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0067] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0068] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0069] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0071] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0072] To address the technical problems in related technologies, embodiments of this application provide a syringe. (See reference...) Figures 1-5 The syringe includes a housing 10, an injection plunger 20, an adjustment knob 30, a dosage scale ring 40, a plunger sleeve 50, a scale ring support 41, a support reset elastic element 42, a torque elastic element 60, and an injection button 70, and includes two working states: setting the dosage and injection. Each component will be described in detail below. For ease of explanation, [the following text will be used as an example]. Figure 2 The directions indicated, such as up, down, left, and right, describe the position and movement of each component.

[0073] The housing 10 has a cavity with openings at both ends, including a distal end connected to the drug container 80 and a proximal end opposite to it.

[0074] Understandably, the proximal end can be Figure 2 The right end of the middle, the far end can be Figure 2 The left end of the middle. It is understood that distal and proximal are relative terms; for example, the injection plunger 20 is located distal to the adjustment knob 30 but proximal to the drug container 80.

[0075] The injection plunger 20 is located within the cavity and is used to move the piston 81 within the drug container 80 during the injection operation. (Reference) Figure 6 and Figure 18 The outer surface of the injection push rod 20 has a first external thread 21, and the distal end of the housing 10 is provided with a first internal thread 131 that matches the first external thread 21. In the injection working state, the injection push rod 20 is driven to rotate and forms a spiral motion through the cooperation of the first external thread 21 and the first internal thread 131.

[0076] Understandably, since the syringe is designed with a standard, full-capacity drug container 80 in mind, in order to ensure that the injected dosage is accurate enough, the drug container 80 attached to the syringe must be removed from the syringe only after the drug has been injected, and cannot be repeatedly removed and reused.

[0077] Specifically, the first external thread 21 and the first internal thread 131 can be a type of transmission thread. More specifically, the first external thread 21 and the first internal thread 131 can be trapezoidal threads.

[0078] The adjustment knob 30 is used to set the dosage. When the syringe is rotated in a first direction around the axis of the injection plunger 20, the syringe enters the working state of setting the dosage.

[0079] Understandably, the first and second directions are relative and not specifically defined. For example, assuming the first direction is clockwise when viewed from the near end, then the second direction is counterclockwise. It's also understandable that by adjusting the structural settings of the components, it could be that if the first direction is counterclockwise when viewed from the near end, then the second direction is clockwise.

[0080] Specifically, refer to Figure 7 and Figure 8 The adjusting knob 30 has a first inner hole, and the inner wall of the first inner hole is provided with at least one radially protruding first inner protrusion 31. The outer wall of the push rod sleeve 50 is provided with a first outer protrusion 51 that mates with the first inner protrusion 31. Through the first inner protrusion 31 and the first outer protrusion 51, the adjusting knob 30 and the push rod sleeve 50 establish a circumferential linkage relationship. It can be understood that other structures capable of establishing circumferential linkage are also possible.

[0081] More specifically, the radial protrusions of the first inner protrusion 31 and the first outer protrusion 51 may be arranged circumferentially, or arranged in a circle in the circumferential direction, or may include multiple protrusions arranged in a circle in the circumferential direction.

[0082] More specifically, in order to facilitate quick switching between forward and reverse rotation, at least one of the first inner protrusion 31 and the first outer protrusion 51 is configured to have at least two radial protrusions, and the spacing between adjacent radial protrusions can only accommodate one radial protrusion of the other protrusion.

[0083] The dosage scale ring 40 is used to indicate the dosage to be injected and can rotate spirally in response to the rotation of the adjustment knob 30.

[0084] Specifically, refer to Figure 9 The outer wall of the dose scale ring 40 is provided with dose numbers arranged in a spiral direction, i.e., the scale.

[0085] The push rod sleeve 50 can rotate in accordance with the rotation of the adjustment knob 30; in the working state of setting the dosage, the push rod sleeve 50 is circumferentially linked with the dosage scale ring 40; in the working state of injection, the push rod sleeve 50 is circumferentially linked with the injection push rod 20 and the dosage scale ring 40.

[0086] Understandably, circumferential linkage means that when one rotates circumferentially, the other also rotates circumferentially, without distinguishing between active and passive; it is a two-way linkage.

[0087] Specifically, refer to Figure 9 and Figure 14The dosage scale ring 40 is provided with a second external thread 43, and the housing 10 is provided with a second internal thread 113 that mates with the second external thread 43. Thus, when the dosage scale ring 40 rotates under the drive of the push rod sleeve 50, the dosage scale ring 40 spirals up and down.

[0088] More specifically, in order to make the dosage scale ring 40 fit the housing 10 better, the second external thread 43 is recessed into the outer wall of the dosage scale ring 40, and the second internal thread 113 protrudes from the inner wall of the housing 10.

[0089] Specifically, refer to Figure 8 and Figure 10 The outer wall of the push rod sleeve 50 is provided with at least one radially protruding second outer protrusion 52, and the inner wall of the scale ring bracket 41 is provided with a second inner protrusion 411 that mates with the second outer protrusion 52. Through the second inner protrusion 411 and the second outer protrusion 52, the push rod sleeve 50 and the scale ring bracket 41 establish a circumferential linkage relationship. It is understood that other structures capable of establishing circumferential linkage could also be used.

[0090] More specifically, the radial protrusions of the second inner protrusion 411 and the second outer protrusion 52 can be arranged circumferentially or arranged in a circle.

[0091] More specifically, in order to facilitate quick switching between forward and reverse rotation, at least one of the second inner protrusion 411 and the second outer protrusion 52 is configured to have at least two radial protrusions, and the spacing between adjacent radial protrusions can only accommodate one radial protrusion of the other protrusion.

[0092] The scale ring bracket 41 is used to transmit the torque of the push rod sleeve 50 to the dose scale ring 40; Reference Figure 10 and Figure 13 The proximal end of the scale ring bracket 41 is provided with a first end face toothed ring 412, and the distal end is circumferentially linked with the push rod sleeve 50; the proximal end of the housing 10 is provided with a second end face toothed ring 121 that meshes with the first end face toothed ring 412.

[0093] The bracket reset elastic element 42 is used to maintain the meshing state of the first end face toothed ring 412 and the second end face toothed ring 121, and abuts axially with the push rod sleeve 50.

[0094] Understandably, the first end face gear ring 412 and the second end face gear ring 121 abut and mesh in the axial direction, which can hinder the circumferential rotation of the scale ring support 41, so as to overcome the torque potential energy of the torsional elastic element 60 and maintain the position of the dosage scale ring 40 in the dosage setting stage when the injection stage has not been entered.

[0095] Specifically, refer to Figure 9and Figure 10 The outer wall of the scale ring support 41 is provided with at least one radially protruding third outer protrusion 413, and the inner wall of the dose scale ring 40 is provided with a third inner protrusion 44 that mates with the third outer protrusion 413. Through the third inner protrusion 44 and the third outer protrusion 413, the dose scale ring 40 and the scale ring support 41 establish a circumferential linkage relationship. It is understood that other structures capable of establishing circumferential linkage may also be used.

[0096] When the push rod sleeve 50 and the scale ring bracket 41 establish a circumferential linkage relationship, and the dose scale ring 40 and the scale ring bracket 41 establish a circumferential linkage relationship, the push rod sleeve 50 and the dose scale ring 40 establish a circumferential linkage relationship. It is understood that other structures capable of establishing circumferential linkage may also be used.

[0097] More specifically, the radial protrusions of the third inner protrusion 44 and the third outer protrusion 413 can be arranged circumferentially or arranged in a circle.

[0098] More specifically, in order to facilitate quick switching between forward and reverse rotation, at least one of the third inner protrusion 44 and the third outer protrusion 413 is configured to have at least two radial protrusions, and the spacing between adjacent radial protrusions can only accommodate one radial protrusion of the other protrusion.

[0099] Understandably, the bracket reset elastic element 42 abuts against the scale ring bracket 41 in the axial direction to maintain the meshing state of the first end face gear ring 412 and the second end face gear ring 121.

[0100] Specifically, the support reset elastic element 42 can be a compression spring. The proximal end of the compression spring abuts against the third outward protrusion 413.

[0101] The proximal end of the torsion elastic element 60 is connected to the housing 10, and the distal end is connected to the scale ring bracket 41; in the working state of setting the dosage, the torsion elastic element 60 is torsionally stored by the rotation of the adjustment knob 30.

[0102] Specifically, refer to Figure 11 The torsion elastic element 60 can be a torsion spring. Both the proximal and distal ends of the torsion spring are provided with connecting portions. More specifically, the connecting portion can be a hook 61. The connecting portion at the proximal end of the torsion spring is connected to the housing 10, and the connecting portion at the distal end is connected to the scale ring bracket 41.

[0103] The injection button 70 axially abuts against the push rod sleeve 50; the injection button 70 moves axially to the distal end, and the syringe enters the injection working state; the injection button 70 drives the push rod sleeve 50 to move axially, compressing the bracket reset elastic element 42, so that the first end face toothed ring 412 and the second end face toothed ring 121 disengage, and the scale ring bracket 41 rotates in the second direction under the torque of the torque elastic element 60; driving the push rod sleeve 50 to rotate, thereby driving the injection push rod 20 to perform a spiral descent motion for injection.

[0104] Specifically, the injection button 70 is provided with a button reset spring 72 to push the injection button 70 to reset after the injection is completed.

[0105] Understandably, the syringe in this application embodiment is a syringe for injecting a predetermined dose, and therefore includes two working states: setting the dose and injection, or two stages: setting the dose and injection. The working process of the two working states is briefly described below:

[0106] 1) Setting the dosage. Rotating the adjustment knob 30 causes the push rod sleeve 50 to rotate, which in turn causes the scale ring bracket 41 to rotate. The scale ring bracket 41 then causes the dosage scale ring 40 to rotate. Since the dosage scale ring 40 has a second external thread 43 and the housing 10 has a second internal thread 113, the dosage scale ring 40 spirals up and down. The corresponding scale can be seen through the transparent or perforated viewing window 15 of the housing 10. Therefore, the required dosage can be set by rotating the adjustment knob 30.

[0107] Specifically, before setting the dosage, the dosage scale ring 40 is located at the proximal end, and the viewing window 15 of the housing 10 displays a "0" scale. The dosage scale ring 40 can only move towards the distal end and cannot move in the reverse direction (this is called the proximal locking position). That is, the adjustment knob 30 can only rotate in the first direction of increasing the dosage, i.e., forward rotation, and cannot rotate in the reverse direction. Only when the scale is not "0" can the adjustment knob 30 rotate in the second direction of decreasing the dosage. For example, if the dosage adjustment exceeds the required dosage, it can be rotated in the reverse direction to decrease the dosage. The dosage scale ring 40 moves in the reverse direction, but the resistance to reverse rotation is greater than the resistance to forward rotation.

[0108] Simultaneously, the rotation of the scale ring bracket 41 will drive the torque elastic element 60 to rotate, thus accumulating torque potential energy. Furthermore, the second end face gear ring 121 near the end of the housing 10 and the first end face gear ring 412 of the scale ring bracket 41 remain engaged under the elastic force of the bracket reset elastic element 42. Without the action of external force, the torque potential energy accumulated by the torque elastic element 60 cannot drive the scale ring bracket 41 to rotate in the opposite direction.

[0109] It should be noted that when setting the dosage, the injection plunger 20 remains stationary in both the axial and circumferential directions to maintain the accuracy of the injection dosage.

[0110] 2) Injection. Press the injection button 70 axially. The injection button 70 axially pushes the push rod sleeve 50 to move axially distally. The push rod sleeve 50 axially compresses the bracket reset elastic element 42. The first end face toothed ring 412 of the scale ring bracket 41 moves distally. After the bracket reset elastic element 42 is compressed to a certain extent, the first end face toothed ring 412 of the scale ring bracket 41 disengages from the second end face toothed ring 121 near the end of the housing 10. The torque potential energy of the torque elastic element 60 is released, causing the scale ring bracket 41 to rotate in the opposite direction. The reverse rotation of the scale ring bracket 41 causes the push rod sleeve 50 to rotate in the opposite direction. The reverse rotation of the push rod sleeve 50 causes the injection push rod 20 to rotate in the opposite direction, causing the injection push rod 20 to move spirally distally, squeezing the piston 81 in the drug container 80 and injecting the drug.

[0111] Simultaneously, the dosage scale ring 40 also spirals up and down following the rotation of the scale ring support 41, gradually decreasing the scale until the viewing window 15 of the housing 10 returns to the "0" scale, and the dosage scale ring 40 returns to the proximal locking position. Since the dosage scale ring 40 can no longer move after returning to the proximal locking position, the torque potential energy of the torsion elastic element 60 can no longer drive the scale ring support 41 to rotate in the opposite direction, and correspondingly, the torque potential energy accumulated by the torsion elastic element 60 is also completely released.

[0112] Understandably, as mentioned earlier, injection can only be performed if the viewing window 15 of the housing 10 does not display a "0" scale after the dosage is set, i.e., the scale is greater than "0". Understandably, when the scale is greater than "0", the position of the dosage scale ring 40 (called the dosage setting position), i.e., the spiral lifting stroke from the proximal locking position, corresponds to the scale. That is, during injection, as the dosage scale ring 40 moves from the dosage setting position to the proximal locking position, or in other words, the viewing window 15 of the housing 10 changes from the set scale to the "0" scale, the injection pusher 20 can cause the drug container 80 to inject the set dosage through axial movement. This requires structural design based on calculations to adapt the movements of the dosage scale ring 40 and the injection pusher 20, for example, by ensuring that the first external thread 21 and the second external thread 43 have appropriate pitches.

[0113] Understandably, the syringe in this embodiment needs to be used in conjunction with a drug container 80. The drug container 80 can be a cartridge bottle, with the distal end serving as the drug ejection port and the proximal end equipped with a piston 81, typically a rubber stopper. After the drug container 80 is installed into the syringe, the injection plunger 20 is axially connected to the piston 81. Thus, the axial movement of the injection plunger 20 can push the piston 81 distally, squeezing the drug out of the drug ejection port. It is understood that other types of drug containers can also be used.

[0114] The syringe of this application embodiment maintains the stable position of the dosage scale ring 40 in the dosage setting by providing a first end face toothed ring 412 on the scale ring bracket 41, a second end face toothed ring 121 on the housing 10 and a bracket reset elastic member 42, without the need for complex structures such as ratchet arm assemblies, thus simplifying the structure of the syringe.

[0115] In other embodiments of this application, reference is made to Figure 12 The syringe also includes:

[0116] The push rod drive 22 is rotatably mounted on the inner wall of the distal end of the housing 10; in the injection working state, the push rod drive 22 is circumferentially linked with the push rod sleeve 50 and the injection push rod 20 to establish circumferential linkage between the push rod sleeve 50 and the injection push rod 20.

[0117] Specifically, in the injection working state, the push rod sleeve 50 moves distally under the push of the injection button 70. After moving to a certain position, it is circumferentially coupled with the push rod drive component 22, establishing a circumferential linkage relationship. When the push rod sleeve 50 is driven to rotate by the scale ring bracket 41, the push rod drive component 22 rotates along with the push rod sleeve 50. Furthermore, the push rod drive component 22 and the injection push rod 20 have a circumferential linkage relationship. Therefore, the rotation of the push rod drive component 22 will drive the rotation of the injection push rod 20. Combined with the engagement of the first external thread 21 and the first internal thread 131 described above, the injection push rod 20 performs a helical rotational motion.

[0118] Specifically, refer to Figure 8 and Figure 12 The inner wall of the push rod sleeve 50 is provided with at least one radially protruding fourth inner protrusion 53, and the outer wall of the push rod drive member 22 is provided with a fourth outer protrusion 221 that mates with the fourth inner protrusion 53. Through the fourth inner protrusion 53 and the fourth outer protrusion 221, the push rod sleeve 50 and the push rod drive member 22 establish a circumferential linkage relationship. It is understood that other structures capable of establishing circumferential linkage can also be used.

[0119] More specifically, the radial protrusions of the fourth inner protrusion 53 and the fourth outer protrusion 221 can be arranged circumferentially or arranged in a circle.

[0120] More specifically, in order to facilitate quick switching between forward and reverse rotation, at least one of the fourth inner protrusion 53 and the fourth outer protrusion 221 is configured to have at least two radial protrusions, and the spacing between adjacent radial protrusions can only accommodate one radial protrusion of the other protrusion.

[0121] Specifically, the outer surface of the injection plunger 20 is provided with at least one first outer plane 23, and the plunger drive member 22 has a second inner hole and is sleeved on the plunger. The inner wall of the second inner hole is provided with at least one first inner plane 222 that mates with the first outer plane 23. Through the first outer plane 23 and the first inner plane 222, the injection plunger 20 and the plunger drive member 22 establish a circumferential linkage relationship.

[0122] More specifically, the outer circular surface of the injection push rod 20 can be provided with two symmetrical first outer planes 23, and correspondingly, two first inner planes 222 are also provided in the second inner hole to form a waist-shaped hole.

[0123] It should be noted that, in the dosage setting state, the axial position of the push rod sleeve 50 remains stationary, and the push rod drive 22 is not circumferentially linked with the push rod sleeve 50. Therefore, the push rod sleeve 50 and the injection push rod 20 cannot establish circumferential linkage. Thus, when setting the dosage, the push rod sleeve 50 rotates, driving the scale ring support 41 to rotate, which in turn drives the scale to rotate, while the injection push rod 20 remains stationary.

[0124] In other embodiments of this application, reference is made to Figure 10 and Figure 13 The meshing edges of the teeth of the first end face tooth ring 412 and the second end face tooth ring 121 are asymmetrical on both sides, so that the rotational resistance of the scale ring bracket 41 in the first direction is less than the rotational resistance in the second direction.

[0125] Specifically, the tooth profiles of the first end face tooth ring 412 and the second end face tooth ring 121 can be non-isosceles trapezoids. This results in higher strength for each individual tooth. It is understood that other shapes are also possible, such as non-isosceles triangles.

[0126] Understandably, in this embodiment, viewed from the near end, the resistance to clockwise rotation of the scale ring bracket 41 is less than the resistance to counterclockwise rotation (the housing 10 remains stationary, i.e.) Figure 13 (The first end ring 12 is fixed). Therefore, in this embodiment, the first direction is clockwise when viewed from the near end, and the second direction is counterclockwise when viewed from the near end. It can be understood that it could also be the opposite; other components can be designed accordingly.

[0127] Furthermore, the meshing edges of the teeth of the first end face gear ring 412 and the second end face gear ring 121 are asymmetrically arranged on both sides. This not only results in different rotational resistances for forward and reverse rotation, but also different sounds for forward and reverse rotation. This prompts the user to indicate whether the current operation is forward or reverse, reducing operational errors.

[0128] Specifically, the inclination angle of one of the meshing sides of the first end face gear ring 412 and the second end face gear ring 121 is 10°-45°, and the inclination angle of the other meshing side is 60°-90°.

[0129] In other embodiments of this application, reference is made to Figure 9 , Figure 15 and Figure 16 The syringe further includes:

[0130] The first sound-generating device includes a first sound-generating structure and a second sound-generating structure that cooperate with each other; the first sound-generating structure is disposed at the proximal end of the dosage scale ring 40, including a first groove 45 and an inclined surface 46 extending to the first groove 45; the second sound-generating structure is disposed at the proximal end of the housing 10, including a first protrusion 122 that matches the first groove 45; in the injection working state, the dosage scale ring 40 rotates spirally until the first protrusion 122 passes the inclined surface 46 and enters the first groove 45.

[0131] Understandably, in the final stage of the injection, the dosage scale ring 40 rotates spirally, and the inclined surface 46 abuts against the first protrusion 122, forcing the first protrusion 122 to deform during the spiral rotation. As the dosage scale ring 40 continues to rotate, the first protrusion 122 falls into the first groove 45, and the compressed and deformed part of the first protrusion 122 is released, emitting a sound different from the injection, indicating to the user that the injection is complete.

[0132] Specifically, the amount of deformation of the first protrusion 122 under pressure can be 0.3-1.2 mm.

[0133] Understandably, the combination of the first groove 45 and the first protrusion 122, in addition to producing sound, can also play a certain role in limiting the circumferential position of the dose scale ring 40.

[0134] In other embodiments of this application, reference is made to Figure 6 The syringe further includes:

[0135] A dose accumulation ring 24 is installed on the inner wall of the push rod sleeve 50 and sleeved on the injection push rod 20. In the working state of setting the dose, the rotation of the push rod sleeve 50 drives the dose accumulation ring 24 to move spirally towards the proximal end until the top of the dose accumulation ring 24 abuts against the injection push rod 20 and can no longer move spirally upward. In the working state of injection, the dose accumulation ring 24 remains axially stationary. When setting the dose, the stroke of the dose accumulation ring 24 that can move spirally on the injection push rod 20 corresponds to the amount of drug remaining in the drug container 80.

[0136] It should be noted that the proximal end of the injection plunger 20 is provided with a radially protruding second stop 25. In the initial state before use, the distance between the proximal end of the dose accumulation ring 24 and the distal end of the second stop 25 is a set first axial distance. The first axial distance is adapted to the capacity of the drug container 80 that mates with the syringe, and also determines the maximum injection dose of the syringe.

[0137] Specifically, in this embodiment, to improve injection accuracy and facilitate portability, the dosage for a single injection is set to be less than the capacity of the drug container 80. Furthermore, the syringe can be used for multiple injections after installing one drug container 80, eliminating the need to install a new drug container 80 for each injection, thus providing convenience for the user. An example is given below.

[0138] For example, a commonly used drug container 80 contains 3 ml, while the syringe in this embodiment has a single injection volume of 0.75 ml, meaning it requires four injections to completely fill the drug container 80. When the initial dose of 0.75 ml is set, the dose accumulation ring 24 follows the rotation of the plunger sleeve 50, spiraling towards the proximal end until it stops after moving 1 / 4 of its maximum stroke. This means the distance between the dose accumulation ring 24 and the injection plunger 20 is 3 / 4 of the first axial distance. During the first injection, since the injection plunger 20 also spirals in the same direction as the dose accumulation ring 24, the axial distance between them remains constant. When the next dose of 75 ml is set, the distance between the dose accumulation ring 24 and the injection plunger 20 is 2 / 4 of the first axial distance. Finally, when the first dose of 75 ml is set, the distance between the dose accumulation ring 24 and the injection plunger 20 is zero, completing the maximum injection dose, and the drug container 80 is disassembled and discarded.

[0139] It is understandable that the dosage set each time can be less than 0.75 ml, so the number of injections is more than 4.

[0140] The dose accumulation loop 24 can prevent the set dose from exceeding the amount of drug remaining in the drug container 80.

[0141] Specifically, the inner wall of the push rod sleeve 50 is provided with a circumferential linkage groove 54, and the outer wall of the dose accumulation ring 24 is provided with a circumferential linkage protrusion 241 that mates with the circumferential linkage groove 54. Through the circumferential linkage groove 54 and the circumferential linkage protrusion 241, the push rod sleeve 50 and the dose accumulation ring 24 establish a circumferential linkage relationship. It is understood that other structures capable of establishing circumferential linkage may also be used.

[0142] Specifically, the circumferential linkage groove 54 and the fourth inner protrusion 53 are axially offset to avoid mutual interference.

[0143] In other embodiments of this application, reference is made to Figure 14A first stop 16 is provided at the distal end of the inner wall of the housing 10. In the working state of setting the dosage, the distal position of the dosage scale ring 40 is restricted to limit the setting of the single injection dosage.

[0144] As previously described, in the working state of setting the dosage, the dosage scale ring 40 moves spirally to the distal end in order to limit the dosage of a single injection. A first stop 16 is provided at the distal end of the housing 10 to block the spiral movement of the dosage scale ring 40 in the axial direction, so that the maximum scale setting does not exceed the design value.

[0145] In other embodiments of this application, reference is made to Figure 16 The dose scale ring 40 has a circumferential second groove 47 at its proximal end, and the housing 10 is provided with a second protrusion 124 that inserts into the second groove 47 to limit the axial position of the dose scale ring 40 at the zero mark.

[0146] Understandably, after the second protrusion 124 enters the second groove 47 and circumferentially abuts against it, the dose calibration ring 40 is located at the zero mark, or in other words, the viewing window 15 of the housing 10 displays the zero mark. The second groove 47 and the second protrusion 124 can more reliably maintain the dose calibration ring 40 at the zero mark position.

[0147] It should be noted that, since the dosage scale ring 40 and the housing 10 are connected by the second external thread 43 and the second internal thread 113, and the second internal thread 113 has relatively few threads, the limiting effect of the second groove 47 and the second protrusion 124 can also prevent the second external thread 43 and the second internal thread 113 from disengaging from the threaded connection.

[0148] It should be noted that the second protrusion 124 enters the second groove 47 and circumferentially abuts after the first sound-generating device emits sound, to prevent the first sound-generating device from failing to emit sound. Furthermore, the second protrusion 124 enters the second groove 47 and circumferentially abuts immediately after the first sound-generating device emits sound. That is, the two points in time are very close together, which improves the injection accuracy of the syringe.

[0149] In other embodiments of this application, reference is made to Figure 17 The torsion elastic element 60 is a torsion spring, and the inner wall of the housing 10 is provided with a hook groove 123 for accommodating the hook 61 of the torsion spring; the radial width of the hook groove 123 is greater than the radial width of the hook 61.

[0150] This increases the installation space for the torsion spring to be installed in the hook slot 123, reducing the difficulty of installing the torsion spring. Furthermore, it increases the space for the torsion spring to deform under stress, reducing the possibility of the torsion spring bursting open and causing syringe failure.

[0151] Specifically, the radial width of the hook groove 123 is 1.4-1.8 mm greater than the radial width of the hook 61.

[0152] In other embodiments of this application, reference is made to Figure 17 The circumferential length of the hook groove 123 abutting the inner wall of the hook 61 is shorter than the circumferential length of the hook 61, so that the hook 61 does not contact the housing 10 at the opening of the hook groove 123.

[0153] In this way, the movement of the base of the torsion spring hook 61 is unrestricted, increasing the deformation space of the torsion spring and reducing the possibility of the torsion spring bursting under force, which could lead to syringe failure. It also reduces the damage caused by the torsion spring deforming under force and squeezing the housing 10.

[0154] In other embodiments of this application, reference is made to Figure 4 The housing 10 includes a tube 11 and a first end ring 12, the first end ring 12 being fixed to the inner wall of the proximal end of the tube 11; the distal end of the first end ring 12 is provided with a second end face toothed ring 121.

[0155] Instead of directly machining the second end face gear ring 121 onto the housing 10, the housing 10 is divided into a tube body 11 and a first end ring 12, with the second end face gear ring 121 mounted on the first end ring 12. This makes machining and assembly easier. It is understood that the first end ring 12 can also be integrally formed with the tube body 11.

[0156] Furthermore, the first protrusion 122, the second protrusion 124, and the hook groove 123 are also provided on the first end ring 12, which makes it easier to process and assemble.

[0157] In other embodiments of this application, reference is made to Figure 4 The housing 10 further includes a second end ring 13, which is fixed to the inner wall of the distal end of the tube 11; the second end ring 13 is provided with the first internal thread 131.

[0158] Similarly, this makes processing and assembly easier. It is understandable that the second end ring 13 can also be integrally formed with the tube body 11.

[0159] In other embodiments of this application, reference is made to Figure 19 The inner wall of the distal end of the tube body 11 is provided with a third groove 111, which extends axially; the outer wall of the second end ring 13 is provided with a third protrusion that cooperates with the third groove 111 to limit the circumferential position of the second end ring 13.

[0160] This design better restricts the circumferential position of the second end ring 13, and has a simple structure and low processing cost.

[0161] In other embodiments of this application, reference is made to Figure 19 The distal end of the tube 11 is provided with a fourth groove 112 that matches the drug container 80, so as to restrict the circumferential position of the drug container 80.

[0162] This design better restricts the circumferential position of the drug container 80, and has a simple structure and low processing cost.

[0163] Specifically, the fourth groove 112 and the third groove 111 are aligned circumferentially and arranged sequentially in the axial direction. This makes it easier to process the tube body 11.

[0164] In other embodiments of this application, reference is made to Figure 5 and Figure 22 The dosage scale ring 40 includes scale markings, the scale markings including an exhaust mark 48; the exhaust mark 48 is between the zero mark and the maximum mark.

[0165] This allows the gas in the drug container to be expelled before injection, making it safer to use.

[0166] Specifically, set the dosage by rotating the dosage scale to the vent mark 48, and then administer the injection. After the injection is complete, set the dosage again by rotating the dosage scale to the vent mark 48 and administer another injection. Repeat this process several times to complete the venting. Afterward, you can begin normal dosage setting and injection.

[0167] In other embodiments of this application, the tube body 11 and the first end ring 12 are provided with a snap-fit ​​connection structure to make the axial connection more stable. (See reference) Figure 13 and Figure 19 The snap-fit ​​connection structure includes a snap protrusion 125 and a snap groove 14. The snap protrusion 125 snaps into the snap groove 14 to complete the connection.

[0168] In other embodiments of this application, reference is made to Figure 20 and Figure 21 The injection button 70 and the push rod sleeve 50 are provided with an axially connected barb 71 connection structure to make the axial connection more stable. (Reference) Figure 20 and Figure 21 The barb 71 connection structure includes a barb 71 and a stepped hole 55. The stepped hole 55 includes a first through hole and a second through hole with a diameter larger than that of the first through hole. The barb 71 passes through the first through hole and enters the second through hole, and completes the connection by hooking the shoulder between the two through holes.

[0169] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A syringe, characterized in that, It includes a housing, injection plunger, adjustment knob, dosage scale ring, plunger sleeve, scale ring bracket, bracket reset elastic element, torque elastic element, and injection button, and includes two working states: dosage setting and injection. The shell has a cavity with openings at both ends, including a distal end connected to the drug container and a proximal end opposite to it. The injection plunger is located inside the cavity and is used to push the piston inside the drug container to move during the injection process; the outer surface of the injection plunger has a first external thread, and the distal end of the housing is provided with a first internal thread that matches the first external thread; during the injection process, the injection plunger is driven to rotate and forms a helical motion through the cooperation of the first external thread and the first internal thread. The adjustment knob is used to set the dosage. When the syringe is rotated in a first direction around the axis of the injection plunger, the syringe enters the working state of setting the dosage. The dosage scale ring is used to indicate the dosage to be injected and can rotate spirally in response to the rotation of the adjustment knob; The push rod sleeve can rotate in response to the rotation of the adjustment knob; in the working state of setting the dosage, the push rod sleeve is circumferentially linked with the dosage scale ring; in the working state of injection, the push rod sleeve is circumferentially linked with the injection push rod and the dosage scale ring. The scale ring bracket is used to transmit the torque of the push rod sleeve to the dosage scale ring; the proximal end of the scale ring bracket is provided with a first end face toothed ring, and the distal end is circumferentially linked with the push rod sleeve; the proximal end of the housing is provided with a second end face toothed ring that meshes with the first end face toothed ring. The bracket reset elastic element is used to maintain the meshing state of the first end face gear ring and the second end face gear ring, and abuts axially with the push rod sleeve; The proximal end of the torsion elastic element is connected to the housing, and the distal end is connected to the scale ring bracket; in the working state of setting the dosage, the torsion elastic element is torsionally stored during the rotation of the adjustment knob; The injection button axially abuts against the push rod sleeve; the injection button moves axially to the distal end, and the syringe enters the injection working state; the injection button drives the push rod sleeve to move axially, compressing the bracket reset elastic element, so that the first end face toothed ring and the second end face toothed ring disengage from the meshing state, and the scale ring bracket rotates in the second direction under the torque of the torque elastic element; driving the push rod sleeve to rotate, thereby driving the injection push rod to perform a spiral descent motion for injection.

2. The syringe according to claim 1, characterized in that, The syringe also includes: A push rod drive is rotatably mounted on the inner wall at the distal end of the housing; in the injection working state, the push rod drive is circumferentially linked with the push rod sleeve and the injection push rod to establish circumferential linkage between the push rod sleeve and the injection push rod.

3. The syringe according to claim 1, characterized in that, The meshing edges of the teeth of the first end face gear ring and the second end face gear ring are asymmetrical on both sides, so that the rotational resistance of the scale ring bracket in the first direction is less than the rotational resistance in the second direction.

4. The syringe according to claim 1, characterized in that, The syringe also includes: The first sound-generating device includes a first sound-generating structure and a second sound-generating structure that cooperate with each other; the first sound-generating structure is disposed at the proximal end of the dosage scale ring and includes a first groove and an inclined surface extending to the first groove; the second sound-generating structure is disposed at the proximal end of the housing and includes a first protrusion that matches the first groove; in the injection working state, the dosage scale ring rotates spirally until the first protrusion passes the inclined surface and enters the first groove.

5. The syringe according to claim 1, characterized in that, The syringe also includes: A dose accumulation ring is installed on the inner wall of the push rod sleeve and fitted onto the injection push rod. In the dose setting operation, the rotation of the push rod sleeve drives the dose accumulation ring to spiral towards the proximal end until the top of the dose accumulation ring abuts against the injection push rod and can no longer spiral upwards. In the injection operation, the dose accumulation ring remains axially stationary. When setting the dose, the spiral stroke of the dose accumulation ring on the injection push rod corresponds to the amount of drug remaining in the drug container.

6. The syringe according to claim 1, characterized in that, A first stop is provided at the distal end of the inner wall of the housing, which restricts the distal position of the dose scale ring in the working state of setting the dose, so as to limit the setting of the single injection dose.

7. The syringe according to claim 1, characterized in that, The dose scale ring has a circumferential second groove at its proximal end, and the housing has a second protrusion that inserts into the second groove to limit the axial position of the dose scale ring at the zero mark.

8. The syringe according to claim 1, characterized in that, The torsional elastic element is a torsion spring, and the inner wall of the housing is provided with a hook groove for accommodating the hook of the torsion spring; the radial width of the hook groove is greater than the radial width of the hook.

9. The syringe according to claim 8, characterized in that, The circumferential length of the hook groove abutting the inner wall of the hook is shorter than the circumferential length of the hook, so that the hook does not contact the housing at the opening of the hook groove.

10. The syringe according to claim 1, characterized in that, The housing includes a tube and a first end ring, the first end ring being fixed to the inner wall of the proximal end of the tube; a second end face toothed ring is provided at the distal end of the first end ring.

11. The syringe according to claim 10, characterized in that, The housing also includes a second end ring, which is fixed to the inner wall of the distal end of the tube; the second end ring is provided with the first internal thread.

12. The syringe according to claim 11, characterized in that, The inner wall of the distal end of the tube is provided with a third groove, which extends axially; the outer wall of the second end ring is provided with a third protrusion that cooperates with the third groove to limit the circumferential position of the second end ring.

13. The syringe according to claim 10, characterized in that, The distal end of the tube is provided with a fourth groove that matches the drug container, thereby restricting the circumferential position of the drug container.

14. The syringe according to claim 1, characterized in that, The dosage scale ring includes scale markings, and the scale markings include venting marks; the venting marks are between the zero mark and the maximum mark.

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