Syringe

Abstract

A syringe, comprising a housing, a driving mechanism and a squeezing mechanism. The driving mechanism is axially slidably provided on the housing, so as to remove the limitation of the housing on the driving mechanism. The squeezing mechanism comprises a transmission seat and a squeezing screw rod, the squeezing screw rod being threadedly connected to the inner side of the housing, the transmission seat being rotationally arranged in the housing and being sleeved on the outer side of the squeezing screw rod, and the transmission seat and the squeezing screw rod being circumferentially limited. The driving mechanism is configured to always keep, during axial sliding, the circumferential limitation with the transmission seat; and when the limitation is removed, the driving mechanism is used for driving the transmission seat to rotate. Hence, no matter the syringe is being started and stopped, the driving mechanism and the transmission seat are always kept in a synchronous state, so as to ensure the angle of rotation of the driving mechanism to be matched with the movement distance of the squeezing screw rod. Therefore, the syringe can accurately control the injection dosage of the syringe by means of the driving mechanism.

Description

A syringe

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 24, 2023, with application number 202310919122.X and invention name “A injection device”, and the priority to the Chinese patent application filed with the China Patent Office on June 7, 2024, with application number 202421311674.9 and utility model name “A syringe”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of a syringe. Background Art

[0003] During treatment, some drugs can be injected into the patient using a syringe, such as semaglutide for diabetes.

[0004] In the related art, the syringe includes a driving mechanism and an extruding mechanism. When the driving mechanism and the extruding mechanism are connected, the driving mechanism drives the extruding mechanism, and the extruding mechanism acts on the tail of the reagent bottle, thereby the syringe injects the medicine into the human body; if the driving mechanism and the extruding mechanism are separated, the driving mechanism stops driving the extruding mechanism, and the extruding mechanism stops acting on the tail of the reagent bottle, thereby the syringe stops injecting the medicine into the human body.

[0005] However, when the driving mechanism and the squeezing mechanism are connected or separated, the actual injection volume of the syringe may easily exceed the driving volume of the driving mechanism, thereby causing the user to inject too much small amount of medicine into the human body.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems in the prior art. To this end, the present application proposes a syringe that ensures the accuracy of injection.

[0008] The present invention provides a syringe comprising:

[0009] case;

[0010] a driving mechanism axially slidably disposed on the housing to release the restriction of the housing on the driving mechanism;

[0011] The extrusion mechanism includes a transmission seat and an extrusion screw, wherein the extrusion screw is threadedly connected to the inner side of the housing, the transmission seat is rotatably arranged on the housing and sleeved on the outer side of the extrusion screw, and the transmission seat and the extrusion screw are circumferentially restricted;

[0012] The driving mechanism is configured to always maintain a circumferential restriction setting with the transmission seat during axial sliding, and the driving mechanism is used to drive the transmission seat to rotate when the restriction is released.

[0013] According to some embodiments of the present application, the driving mechanism is provided with first transmission parts at intervals in the circumferential direction, the transmission seat is provided with second transmission parts at intervals in the circumferential direction, and the first transmission parts and the second transmission parts are provided with circumferential restriction and axial sliding.

[0014] According to some embodiments of the present application, the inner side of the shell is spaced apart by first circumferential limiting portions in the circumferential direction, and the driving mechanism is spaced apart by second circumferential limiting portions in the circumferential direction. The first circumferential limiting portions and the second circumferential limiting portions are circumferentially limited and axially slidingly arranged. The length of the first circumferential limiting portion and the second circumferential limiting portion in the axial direction is smaller than the length of the first transmission portion and the second transmission portion in the axial direction. The first circumferential limiting portion and the second circumferential limiting portion can be axially separated to release the circumferential limitation of the driving mechanism.

[0015] According to some embodiments of the present application, an end portion of the first circumferential limiting portion is provided with a first guide surface for guiding the second circumferential limiting portion;

[0016] And / or, the end portion of the second circumferential limiting portion is provided with a second guide surface for guiding the first circumferential limiting portion.

[0017] According to some embodiments of the present application, the driving mechanism includes:

[0018] A main drive shaft is arranged inside the housing;

[0019] a torsion spring, the torsion spring being sleeved on the outside of the main drive shaft and connected to the housing and the main drive shaft;

[0020] a clutch assembly, the clutch assembly being rotationally connected to the main drive shaft so as to be capable of synchronous axial sliding with the main drive shaft;

[0021] In which, the clutch assembly is provided with the second circumferential limiting portion and the first transmission portion in the circumferential direction. When the first circumferential limiting portion and the second circumferential limiting portion are circumferentially restricted, the clutch assembly is used to maintain the position of the main drive shaft after rotation adjustment; when the first circumferential limiting portion and the second circumferential limiting portion are axially separated, the main drive shaft drives the transmission seat to rotate through the clutch assembly.

[0022] According to some embodiments of the present application, the clutch assembly includes:

[0023] a clutch base, sleeved on the main drive shaft, wherein the clutch base is provided with the second circumferential limiting portion in the circumferential direction;

[0024] a clutch member, sleeved on the main drive shaft, wherein the main drive shaft is provided with first clutch teeth spaced apart in a circumferential direction, and the clutch member is provided with second clutch teeth in a circumferential direction, wherein the first clutch teeth are meshed with the second clutch teeth;

[0025] an elastic member, one end of the elastic member abutting against the clutch base, and the other end of the elastic member abutting against the clutch member, so that the first clutch tooth and the second clutch tooth remain in meshing relationship;

[0026] The connecting seat is connected to the clutch base and is rotationally connected to the main drive shaft. The connecting seat is provided with the first transmission part in the circumferential direction.

[0027] According to some embodiments of the present application, the connecting seat is snap-connected to the clutch base.

[0028] According to some embodiments of the present application, the first transmission parts are sequentially arranged on the inner circumferential surface of the connecting seat, and the outer arc surface of the second transmission part is arranged to fit the inner circumferential surface of the connecting seat.

[0029] According to some embodiments of the present application, an annular ridge is provided at an end of the main drive shaft close to the transmission seat, the first transmission parts are arranged at intervals in the circumferential direction at the end of the annular ridge close to the transmission seat, and the first clutch teeth are arranged at intervals in the circumferential direction at the other end;

[0030] The annular convex edge is provided with a first rotation groove on the outer circumference, and the inner circumference of the connecting seat is provided with a first rotation protrusion, and the first rotation protrusion is rotatably embedded in the first rotation groove;

[0031] The annular convex edge is provided with a first hooking hole, and one end of the torsion spring is hooked in the first hooking hole.

[0032] According to some embodiments of the present application, one of the clutch base and the clutch member is provided with a first tooth portion in a circumferential direction, and the other is provided with a first elastic arm, the end of the first elastic arm has a first protrusion, the first protrusion is embedded in the tooth groove of the first tooth portion, and can slide axially; wherein, in a circumferential direction of the main drive shaft, the resistance between the first clutch tooth and the second clutch tooth is smaller than the resistance between the first tooth portion and the first protrusion; in another circumferential direction of the main drive shaft, the resistance between the first clutch tooth and the second clutch tooth is greater than the resistance between the first tooth portion and the first protrusion.

[0033] According to some embodiments of the present application, the syringe comprises:

[0034] a transmission sleeve rotatably disposed inside the housing and circumferentially limited with the main drive shaft so as to be able to rotate synchronously with the main drive shaft;

[0035] The scale sleeve is arranged on the inner side of the shell and is threadedly connected to the inner side of the shell. The scale sleeve is sleeved on the outer side of the transmission sleeve and is circumferentially restricted so that it can rotate synchronously with the transmission sleeve. The side wall of the shell is provided with an observation port for observing the scale of the scale sleeve.

[0036] According to some embodiments of the present application, a fixed sleeve is integrally provided on the inner side of the shell, and the fixed sleeve is sleeved on the outer side of the torsion spring. The first circumferential limiting portion is spaced apart in the circumferential direction at one end of the fixed sleeve close to the clutch assembly. The transmission sleeve is rotatably sleeved on the fixed sleeve, and the front end of the torsion spring is connected to the main drive shaft, and the rear end is connected to the fixed sleeve.

[0037] According to some embodiments of the present application, a fixed sleeve is axially plugged and fixed on the inner side of the shell, and the fixed sleeve is sleeved on the outer side of the torsion spring. The first circumferential limiting portion is spaced apart in the circumferential direction at one end of the fixed sleeve close to the clutch assembly, and the transmission sleeve is rotatably sleeved on the fixed sleeve, and the front end of the torsion spring is connected to the main drive shaft, and the rear end is connected to the fixed sleeve.

[0038] According to some embodiments of the present application, a third circumferential limiting portion is provided on the inner circumferential surface of the shell, and a fourth circumferential limiting portion is provided on the side of the fixed sleeve, and the third circumferential limiting portion is axially plug-fitted with the fourth circumferential limiting portion.

[0039] According to some embodiments of the present application, the end portion of the third circumferential limiting portion is provided with a third guide surface for guiding the fourth circumferential limiting portion;

[0040] And / or, the end portion of the fourth circumferential limiting portion is provided with a fourth guide surface for guiding the third circumferential limiting portion.

[0041] According to some embodiments of the present application, a first convex ring portion is provided at the end of the fixing sleeve, the outer circumference of the first convex ring portion is gradually contracted, and the first circumferential limit portion is arranged on the outer circumference of the first convex ring portion;

[0042] A second convex ring portion is provided at the end of the clutch assembly, the inner circumference of the second convex ring portion is gradually enlarged, and the second circumferential limiting portion is arranged on the inner circumference of the second convex ring portion.

[0043] According to some embodiments of the present application, the main drive shaft has an axial hole formed along its central axis, and a guide port is formed at the end of the main drive shaft near the transmission seat, and the inner wall of the axial hole is provided with a limiting surface facing the guide port;

[0044] The syringe further comprises a limiting ring, which is threadedly connected to the extrusion screw, and the limiting ring is axially slidably arranged in the axial hole and is circumferentially limited to the main driving shaft.

[0045] According to some embodiments of the present application, a first positioning tooth portion is axially extended on the inner circumference of the axial hole, and a plurality of second positioning teeth portions are sequentially arranged on the outer circumference of the limiting ring. The first positioning tooth portion is axially slidably arranged in the tooth groove of the second positioning tooth portion.

[0046] According to some embodiments of the present application, the syringe further comprises:

[0047] A knob is rotatably mounted on the rear end of the housing and is circumferentially restricted with the rear end of the main drive shaft;

[0048] A button, on which the rear end portion of the knob is axially slidably provided and abuts against the rear end portion of the main drive shaft;

[0049] A compression spring, held between the knob and the button, for pushing the button to reset backward;

[0050] In which, a third elastic arm is circumferentially extended at the rear end portion of the shell, and a third protrusion protrudes outward at the end portion of the third elastic arm, and the inner wall of the knob abuts against the third protrusion, so that the third elastic arm elastically deforms inward from the initial state to a locked state; wherein, the third elastic arm has a first abutting end facing circumferentially, and the scale sleeve has a second abutting end facing circumferentially, and when the third elastic arm is in the locked state, the second abutting end can abut against the first abutting end.

[0051] According to some embodiments of the present application, the extrusion mechanism further includes a nut seat, the nut seat is connected to the shell, and the extrusion screw is threadedly connected to the nut seat.

[0052] According to some embodiments of the present application, one of the nut seat and the transmission seat is provided with a second tooth portion in the circumferential direction, and the other is provided with a second elastic arm, and the end of the second elastic arm is provided with a second protrusion, and the second protrusion is embedded in the tooth groove of the second tooth portion.

[0053] As can be seen from the above technical solution, the embodiment of the present application has the following advantages: the drive mechanism and the transmission seat always maintain a circumferentially restricted state, that is, when the housing circumferentially restricts the rotation of the drive mechanism and when it does not restrict the rotation of the drive mechanism, the drive mechanism and the transmission seat always maintain a circumferentially restricted state. Therefore, during the use of the syringe, when the syringe is started and stopped, or more precisely, when the housing releases the restriction on the drive mechanism and when it again restricts the rotation of the drive mechanism, the drive mechanism and the transmission seat always maintain a synchronized state, thereby ensuring that the rotation angle of the drive mechanism is compatible with the travel distance of the extrusion screw. Therefore, the syringe can use the drive mechanism to accurately control the injection volume of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a schematic diagram of the overall structure of a syringe according to an embodiment of the present application;

[0055] FIG2 is a schematic diagram of an axial cross-sectional structure of a syringe according to an embodiment of the present application;

[0056] FIG3 is a schematic diagram of the assembly structure of the driving mechanism and the extrusion mechanism according to an embodiment of the present application;

[0057] FIG4 is a schematic diagram of the exploded structure of the driving mechanism and the extrusion mechanism according to an embodiment of the present application;

[0058] FIG5 is a schematic structural diagram of FIG4 from another angle;

[0059] FIG6 is a schematic structural diagram of a clutch assembly according to an embodiment of the present application;

[0060] FIG7 is a schematic diagram of a partially exploded structure of a syringe according to an embodiment of the present application;

[0061] FIG8 is a schematic structural diagram of a fixed sleeve, a transmission sleeve, a scale sleeve, and a rear housing according to an embodiment of the present application;

[0062] FIG9 is a schematic diagram of the exploded structure of the main drive shaft, the extrusion screw, and the limit ring according to an embodiment of the present application;

[0063] FIG10 is a schematic diagram of an axial cross-sectional structure of a main drive shaft according to an embodiment of the present application;

[0064] FIG11 is a schematic diagram of the exploded structure of the rear housing, torque, and button according to an embodiment of the present application;

[0065] FIG12 is a schematic structural diagram of a knob according to an embodiment of the present application.

[0066] The meanings of the reference numerals are as follows:

[0067] 100, housing; 110, front housing; 120, rear housing; 121, observation port; 122, third circumferential limiting portion; 123, third elastic arm; 1231, first abutting end; 124, third protrusion; 125, second rotation groove; 130, knob; 131, second rotation protrusion; 140, button; 150, compression spring; 200, driving mechanism; 210, main driving shaft; 211, axial hole; 2111, first positioning tooth portion; 2112, limiting surface; 2113, guide port; 212, annular ridge; 2121, first clutch tooth; 2122, first rotation groove; 2143, first hooking hole; 220, torsion spring; 230, clutch assembly; 231, clutch base; 2311, first tooth portion; 2312, second protruding ring portion; 2313, second circumferential limiting portion; 232, clutch member; 2321, second clutch tooth; 2322, first elastic arm; 2323, first protrusion; 233, elastic member; 234, connecting seat; 2341, first transmission member; 2342, first rotating protrusion; 300, extrusion mechanism; 310, transmission seat; 311, second transmission member; 312, guide protrusion; 313, second elastic arm; 314, second protrusion; 320, extrusion screw; 321, guide recess Groove; 330, nut seat; 331, second tooth portion; 400, limiting ring; 410, second positioning tooth portion; 500, transmission sleeve; 600, scale sleeve; 610, second abutting end; 700, fixed sleeve; 710, sleeve portion; 720, front ring portion; 721, fourth circumferential limiting portion; 722, stopping protrusion; 730, rear ring portion; 731, second hooking hole; 740, first protruding ring portion; 741, first circumferential limiting portion. DETAILED DESCRIPTION

[0068] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0069] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, upper, lower, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0070] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0071] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0072] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0073] The present application will be further described in detail below with reference to the accompanying drawings.

[0074] Please refer to Figures 1 to 3, which show a syringe provided in an embodiment of the present application, including a shell 100, a driving mechanism 200 and an extrusion mechanism 300. The shell 100 is roughly cylindrical, and the driving mechanism 200 is axially slidably arranged on the shell 100 to be able to release the restriction of the shell 100 on the driving mechanism 200; the extrusion mechanism 300 includes a transmission seat 310 and an extrusion screw 320, wherein the extrusion screw 320 is threadedly connected to the inner side of the shell 100, the transmission seat 310 is rotatably arranged on the shell 100, and is sleeved on the outer side of the extrusion screw 320, and the transmission seat 310 and the extrusion screw 320 are circumferentially restricted; wherein the driving mechanism 200 is configured to always maintain a circumferential restriction with the transmission seat 310 during axial sliding, and the driving mechanism 200 is used to drive the transmission seat 310 to rotate when the restriction is released.

[0075] During specific application, the drive mechanism 200 slides axially forward, and the housing 100 releases the restriction on the drive mechanism 200. The drive mechanism 200 can drive the transmission seat 310 to rotate circumferentially, and the transmission seat 310 drives the extrusion screw 320 to rotate synchronously. Since the extrusion screw 320 is threadedly connected to the housing 100, the extrusion screw 320 moves axially forward during the synchronous rotation of the transmission seat 310, and the front end of the extrusion screw 320 acts on the tail of the reagent bottle, and the syringe injects the reagent into the human body. After the reagent injection is completed, the drive mechanism 200 moves backward, and the housing 100 again restricts the drive mechanism 200 circumferentially. The drive mechanism 200 stops driving the transmission seat 310, and the transmission seat 310 stops driving the extrusion screw 320. As a result, the syringe stops injecting the reagent into the human body.

[0076] It can be understood that the drive mechanism 200 and the transmission seat 310 always maintain a circumferentially restricted state. That is, when the housing 100 circumferentially restricts the rotation of the drive mechanism 200 or when it does not restrict the rotation of the drive mechanism 200, the drive mechanism 200 and the transmission seat 310 always maintain a circumferentially restricted state. Therefore, during the use of the syringe, when the syringe is started and stopped, or more specifically, when the housing 100 releases the restriction on the drive mechanism 200 and again restricts the rotation of the drive mechanism 200, the drive mechanism 200 and the transmission seat 310 always maintain a synchronized state, thereby ensuring that the rotation angle of the drive mechanism 200 is compatible with the travel distance of the extrusion screw 320. Therefore, the syringe can use the drive mechanism 200 to accurately control the injection volume of the syringe.

[0077] In order to achieve the circumferential restriction of the extrusion screw 320 and the transmission seat 310, in some embodiments, the side wall of the extrusion screw 320 is provided with a guide groove 321 along its axial direction, and the inner circumference of the transmission seat 310 is provided with a guide protrusion 312 (refer to Figures 4 and 9), and the guide protrusion 312 is slidably embedded in the guide groove 321. Thus, the extrusion screw 320 and the transmission seat 310 are circumferentially restricted and can slide axially along the transmission seat 310.

[0078] In some embodiments, referring to Figures 2 to 4 , the drive mechanism 200 is circumferentially spaced apart with first transmission portions 2341 (see Figure 5 ), or in other words, the first transmission portions 2341 are sequentially arranged around the central axis of the drive mechanism 200; and the transmission base 310 is circumferentially spaced apart with second transmission portions 311, or in other words, the second transmission portions 311 are sequentially arranged around the central axis of the transmission base 310. The first transmission portions 2341 and the second transmission portions 311 are axially plugged into each other, thereby constraining the first transmission portions 2341 and the second transmission portions 311 in a circumferentially spaced relationship and enabling axial relative movement. It is understood that the first transmission portions 2341 and the second transmission portions 311 have sufficient axial length to maintain contact with each other circumferentially during axial sliding of the drive mechanism 200. This maintains the circumferential constraint between the main drive shaft 210 and the transmission base 310, thereby ensuring synchronization between the drive mechanism 200 and the transmission base 310.

[0079] Furthermore, first circumferential stoppers 741 are circumferentially spaced apart on the inner side of the housing 100, or in other words, the first circumferential stoppers 741 are sequentially arranged around the central axis of the housing 100. Second circumferential stoppers 2313 are circumferentially spaced apart on the drive mechanism 200, or in other words, the second circumferential stoppers 2313 are sequentially arranged around the central axis of the drive mechanism 200. The first circumferential stoppers 741 and the second circumferential stoppers 2313 are axially plugged into and engaged with each other. The first and second circumferential stoppers 741 and 2313 are circumferentially constrained and axially slidable relative to each other, thereby circumferentially constraining the rotation of the drive mechanism 200 by the housing 100. It will be appreciated that when the drive mechanism 200 moves axially forward, the first and second circumferential stoppers 741 and 2313 axially separate, releasing the housing 100 from constraining the drive mechanism 200. The drive mechanism 200 can then drive the transmission base 310 to rotate, allowing the syringe to inject the medication into the human body. When the driving mechanism 200 moves backward, the first circumferential limiting portion 741 and the second circumferential limiting portion 2313 are plugged into each other again, and the shell 100 again limits the rotation of the driving mechanism 200, so that the driving mechanism 200 stops driving the transmission seat 310 to continue rotating, and the syringe stops injecting medicine into the human body.

[0080] Among them, the length of the first circumferential limiting portion 741 and the second circumferential limiting portion 2313 in the axial direction is smaller than the length of the first transmission portion 2341 and the second transmission portion 311 in the axial direction. Therefore, during the axial sliding process of the driving mechanism 200, the driving mechanism 200 and the transmission seat 310 always maintain the circumferential limiting setting.

[0081] Furthermore, a first guide surface is provided at the front end of the first circumferential limit portion 741, and the first guide surface is used to provide circumferential guidance for the second circumferential limit portion 2313; and / or a second guide surface is provided at the rear end of the second circumferential limit portion 2313, and the second guide surface is used to provide axial guidance for the first circumferential limit portion 741. The first guide surface and the second guide surface can be guide arc surfaces or guide inclined surfaces. It is understood that when the second circumferential limit portion 2313 is again plugged into and mated with the first circumferential limit portion 741, the first guide surface and the second guide surface have a circumferential guiding effect on each other, thereby ensuring that the second circumferential limit portion 2313 can be smoothly plugged into and mated with the first circumferential limit portion 741.

[0082] In some embodiments, referring to Figures 3 to 5, the syringe further comprises a main drive shaft 210, a torsion spring 220, and a clutch assembly 230, wherein the front end of the main drive shaft 210 has an outwardly protruding annular ridge 212, the torsion spring 220 is sleeved on the outside of the main drive shaft 210, the front end of the torsion spring 220 is hooked in a first hooking hole 2143 on the annular ridge 212 (see Figure 9), and the other end is connected to the inner side of the housing 100, for providing the main drive shaft 210 with a rotational force to reset after rotation adjustment. The clutch assembly 230 is connected to the housing 100 and the main drive shaft 210, for maintaining the position of the main drive shaft 210 after rotation adjustment, thereby allowing the torsion spring 220 to accumulate force. At the same time, the clutch assembly 230 is rotationally connected to the main drive shaft 210 so as to be able to slide axially synchronously with the main drive shaft 210.

[0083] The housing 100 is circumferentially spaced apart with first circumferential limiting portions 741 on its inner side, and the clutch assembly 230, distal to the transmission seat 310, is circumferentially spaced apart with second circumferential limiting portions 2313. The first circumferential limiting portions 741 and the second circumferential limiting portions 2313 are axially plugged into and mated with each other, providing a circumferentially constrained arrangement. Thus, the housing 100 limits relative rotation of the clutch assembly 230 via the first circumferential limiting portions 741, thereby limiting rotation of the main drive shaft 210. Furthermore, the clutch assembly 230, proximal to the transmission seat 310, is circumferentially spaced apart with a first transmission portion 2341 to maintain a circumferentially constrained arrangement with the second circumferential limiting portion 2313 of the transmission seat 310.

[0084] Specifically, during the energy storage phase, the first circumferential limit portion 741 and the second circumferential limit portion 2313 are in a circumferentially restricted state in the circumferential direction. The staff member rotates the main drive shaft 210 in the opposite direction to adjust the torsion spring 220, and the torsion spring 220 is charged. After the main drive shaft 210 is rotated and adjusted, the clutch assembly 230 locks the main drive shaft 210, and the main drive shaft 210 remains in the position after the rotation adjustment, and the torsion spring 220 is charged. During the driving phase, the staff member presses the main drive shaft 210 axially forward to overcome the elastic force of the torsion spring 220 in the axial direction. The main drive shaft 210 drives the clutch assembly 230 to move forward synchronously, and the first circumferential limit portion 741 and the second circumferential limit portion 2313 are axially separated. At this time, the housing 100 releases the restriction on the clutch assembly 230, and the clutch assembly 230 loses its restraining effect on the main drive shaft 210. Therefore, the clutch assembly 230 and the main drive shaft 210 rotate forward synchronously under the action of the torsion spring 220, thereby driving the transmission seat 310 to rotate forward, and the extrusion screw 320 moves axially forward relative to the shell 100, thereby squeezing the tail of the reagent bottle.

[0085] In a further possible embodiment, referring to Figures 4 to 6 , the clutch assembly 230 includes a clutch base 231, a clutch member 232, an elastic member 233, and a connecting base 234. The clutch base 231 is sleeved onto the main drive shaft 210. The end of the clutch base 231 away from the transmission base 310 is circumferentially spaced apart with the aforementioned second circumferential stoppers 2313. An annular flange 212 protrudes outward from the end of the main drive shaft 210 proximate the transmission base 310. The end of the annular flange 212 away from the transmission base 310 is circumferentially spaced apart with first clutch teeth 2121. The clutch member 232 is sleeved onto the outside of the main drive shaft 210 and positioned between the clutch base 231 and the annular flange 212. The end of the clutch member 232 proximate the annular flange 212 is circumferentially spaced apart with second clutch teeth 2321. The first clutch teeth 2121 mesh with the second clutch teeth 2321. An elastic member 233 is sleeved on the main drive shaft 210, with one end abutting against the clutch base 231 and the other end abutting against the clutch member 232. Thus, the elastic member 233 maintains engagement between the first clutch teeth 2121 and the second clutch teeth 2321. The connecting base 234 is connected to the clutch base 231, such as by a snap-fit ​​connection. The connecting base 234 is rotatably connected to the annular flange 212. For example, the outer circumference of the annular flange 212 defines a first rotation groove 2122, and the inner circumference of the connecting base 234 is provided with a first rotation protrusion 2342, which is rotatably embedded in the first rotation groove 2122. Furthermore, a first transmission portion 2341 is circumferentially provided on the end of the connecting base 234 proximal to the transmission base 310 to maintain a circumferentially restricted position with the second circumferential limit portion 2313 of the transmission base 310.

[0086] Specifically, when the user rotates the main drive shaft 210 in the reverse direction, the clutch member 232 overcomes the elastic force of the elastic member 233 and moves away from the first clutch tooth 2121, thereby causing the first clutch tooth 2121 to rotate relative to the second clutch tooth 2321. When the main drive shaft 210 stops rotating, the elastic member 233 causes the first clutch tooth 2121 to mesh with the second clutch tooth 2321, thereby maintaining the main drive shaft 210 in the adjusted rotational position.

[0087] It is understandable that the connecting seat 234 is snap-connected to the clutch base 231 . With this arrangement, the clutch member 232 , the elastic member 233 , the clutch base 231 and the connecting seat 234 can be conveniently assembled on the main drive shaft 210 .

[0088] Furthermore, the inner side of the clutch base 231 is provided with a plurality of first teeth 2311 spaced apart in the circumferential direction. A first elastic arm 2322 is provided circumferentially extending from the side of the clutch member 232. The end of the first elastic arm 2322 has a first protrusion 2323 protruding outward. The first protrusion 2323 is embedded in the tooth groove of the adjacent first tooth 2311 and can slide axially along the tooth groove. Of course, the first elastic arm 2322 can also be provided on the clutch base 231, and the clutch member 232 is provided with the first tooth groove, but this will not be described in detail. In the reverse direction of the main drive shaft 210, more precisely, in the opposite direction of the torsion of the torsion spring 220, the resistance between the first clutch tooth 2121 and the second clutch tooth 2321 is smaller than the resistance between the first protrusion 2323 and the first tooth portion 2311; in the forward direction of the main drive shaft 210, more precisely, in the torsion direction of the torsion spring 220, the resistance between the first clutch tooth 2121 and the second clutch tooth 2321 is greater than the resistance between the first protrusion 2323 and the first tooth portion 2311.

[0089] Specifically, when the user rotates the main drive shaft 210 in the reverse direction, the resistance between the first clutch tooth 2121 and the second clutch tooth 2321 becomes less than the resistance between the first protrusion 2323 and the first tooth portion 2311. Consequently, the clutch member 232 overcomes the elastic force of the elastic member 233 and moves away from the first clutch tooth 2121. Consequently, the first clutch tooth 2121 rotates relative to the second clutch tooth 2321. When the main drive shaft 210 stops rotating, the first clutch tooth 2121 meshes with the second clutch tooth 2321, thereby maintaining the main drive shaft 210 in the adjusted position. When the adjusted position of the main drive shaft 210 needs to be corrected, the user rotates the main drive shaft 210 forward, and the resistance between the first clutch tooth 2121 and the second clutch tooth 2321 is greater than the resistance between the first protrusion 2323 and the first tooth portion 2311. As a result, the relative position between the clutch 232 and the main drive shaft 210 remains unchanged, the first elastic arm 2322 deforms inward, and the first protrusion 2323 switches position in the tooth groove between adjacent first tooth portions 2311, thereby keeping the main drive shaft 210 in the adjusted position.

[0090] In order to further locate the position between the connecting seat 234 and the transmission seat 310, in some embodiments, the first transmission part 2341 is arranged in sequence on the inner circumferential surface of the connecting seat 234, the second transmission part 311 is inserted into the inner side of the connecting seat 234, and is circumferentially restricted with the first transmission part 2341, and the outer arc surface of the second transmission part 311 is fitted with the inner circumferential surface of the connecting seat 234, thereby further positioning the position between the connecting seat 234 and the transmission seat 310, thereby maintaining the synchronization between the main drive shaft 210 and the transmission seat 310.

[0091] In some embodiments, with reference to Figures 3 and 4, the extrusion mechanism 300 further includes a nut seat 330, and the extrusion screw 320 is arranged on the inner ring body of the nut seat 330 to be threadedly connected with the nut seat 330, thereby, the extrusion screw 320 is threadedly connected to the housing 100 through the nut seat 330. The front end of the transmission seat 310 is rotatably arranged on the rear end of the inner ring body of the nut seat 330, thereby, the nut seat 330 and the transmission seat 310 are relatively positioned. The housing 100 includes a front shell 110 and a rear shell 120 (with reference to Figures 1 and 2), the front end of the rear shell 120 is assembled on the outer side of the nut seat 330, the front shell 110 is assembled on the end of the nut seat 330 away from the rear shell 120, the main drive shaft 210, the transmission seat 310 and other components are all assembled on the rear shell 120, the inner side of the front shell 110 is used to accommodate the reagent bottle, and the active end of the extrusion screw 320 extends to the inner side of the front shell 110 to act on the tail of the reagent bottle. In addition, the rear housing 120 is provided with a button 140 and a knob 130. The button 140 facilitates pressing the main drive shaft 210, and the knob 130 facilitates rotating the main drive shaft 210. Details will be described later.

[0092] Furthermore, the outer ring of the nut seat 330 is provided with second teeth 331 at intervals on its inner circumference. A second elastic arm 313 is provided on the side of the transmission seat 310, and a second protrusion 314 protrudes outward from the end of the second elastic arm 313. The second protrusion 314 is embedded in the tooth grooves between adjacent second teeth 331. Of course, the second elastic arm 313 can also be provided on the nut seat 330, and the second teeth 331 provided on the transmission seat 310, but this will not be described in detail. During the rotation of the transmission seat 310, the second elastic arm 313 and the second protrusion 314 also rotate circumferentially. The second elastic arm 313 undergoes elastic deformation, and the second protrusion 314 jumps into each tooth groove of the second teeth 331 in sequence, causing the syringe to emit a sound and / or generate a slight vibration during the injection process, reminding medical personnel that the syringe is normally injecting medicine into the patient.

[0093] In some embodiments, referring to Figures 7 and 8, the syringe includes a transmission sleeve 500 and a scale sleeve 600, wherein the transmission sleeve 500 is rotatably arranged on the inner side of the shell 100 and is circumferentially fixed with the main drive shaft 210 so as to be able to rotate synchronously with the main drive shaft 210. For example, the rear end portion of the main drive shaft 210 has strip grooves spaced apart on the outer circumference, and the transmission sleeve 500 has strip protrusions spaced apart on the inner circumference, and the strip protrusions are slidably embedded in the strip grooves. Thus, the transmission sleeve 500 and the main drive shaft 210 are circumferentially restricted. The graduated sleeve 600 is at least partially sleeved on the outside of the transmission sleeve 500 and is circumferentially constrained so as to rotate synchronously with the transmission sleeve 500. For example, the transmission sleeve 500 has a strip-shaped groove on its outer circumference along its axial direction, and the graduated sleeve 600 has a strip-shaped protrusion on its inner circumference along its axial direction. The strip-shaped protrusion is slidably embedded in the strip-shaped groove. As a result, the transmission sleeve 500 and the graduated sleeve 600 are circumferentially constrained and can slide axially relative to each other. The sidewall of the rear end of the housing 100 has an observation port 121, through which a user can observe the scale of the graduated sleeve 600.

[0094] Further, with reference to Figures 3, 9 and 10, the main drive shaft 210 is provided with an axial hole 211 along its central axis, and a guide port 2113 is formed at the end of the main drive shaft 210 near the transmission seat 310, that is, the front end of the main drive shaft 210, and the inner wall of the axial hole 211 is provided with a limiting surface 2112 facing the guide port 2113. The syringe also includes a limiting ring 400, which is threadedly connected to the extrusion screw 320. The limiting ring 400 is axially slidably arranged in the axial hole 211 and is circumferentially restricted with the main drive shaft 210. Among them, the sliding distance of the limiting ring 400 between the limiting surface 2112 and the transmission seat 310 is configured to be the capacity of a reagent bottle.

[0095] Specifically, in the dose adjustment stage, the main driving shaft 210 drives the transmission sleeve 500 to rotate in the reverse direction, and the transmission sleeve 500 drives the scale sleeve 600 to rotate circumferentially. Because the scale sleeve 600 and the transmission sleeve 500 are axially slidably arranged and are threadedly connected to the inner side of the shell 100, when the transmission sleeve 500 drives the scale sleeve 600 to rotate, the scale sleeve 600 spirally rotates backward on the inner side of the shell 100, thereby adjusting the scale of the scale sleeve 600; at the same time, when the main drive shaft 210 rotates in the opposite direction, the main drive shaft 210 simultaneously adjusts the position of the limit ring 400 in the axial hole 211 until the rear end of the limit ring 400 abuts against the limit surface 2112, and the main drive shaft 210 adjusts the force storage condition of the torsion spring 220, thereby achieving consistency in the adjustment of the scale sleeve 600, the adjustment of the limit ring 400 and the adjustment of the torsion spring 220, thereby ensuring that the adjustment scale of the scale sleeve 600 is consistent with the injection volume of the syringe.

[0096] During the injection phase, the main drive shaft 210 is in driving connection with the transmission base 310. The main drive shaft 210 drives the transmission base 310 to rotate forward, and the transmission base 310 drives the extrusion screw 320 to rotate forward synchronously. Since the extrusion screw 320 is threadedly connected to the housing 100, the extrusion screw 320 moves outward along the axial hole 211 during the process of the transmission base 310 driving the extrusion screw 320 to rotate. The head of the extrusion screw 320 abuts the tail end of the reagent bottle, thereby injecting the medicine into the patient. When the end of the limit sleeve abuts the transmission base 310, the injection of the reagent in the reagent bottle is completed.

[0097] In addition, during the dose adjustment process, the first transmission part 2341 and the second transmission part 311 are circumferentially restricted. With this arrangement, the clutch assembly 230 can restrict the rotation of the transmission seat 310, and the transmission seat 310 restricts the rotation of the main drive shaft 210. Thus, during the rotation of the main drive shaft 210, the main drive shaft 210 can drive the limiting ring 400 to move along the extrusion screw 320 toward the limiting surface 2112.

[0098] 9 and 10 , a first positioning tooth portion 2111 is axially extended from the inner circumference of the axial hole 211 , and a plurality of second positioning tooth portions 410 are sequentially spaced from the outer circumference of the limiting ring 400 . The first positioning tooth portion 2111 is axially slidably arranged in the tooth groove of the second positioning tooth portion 410 .

[0099] It is understood that during the assembly process of the syringe, the transmission base 310 and the retaining ring 400 are pre-installed on the extrusion screw 320. When the extrusion screw 320 is installed on the main drive shaft 210, the staff needs to align the retaining ring 400 with the axial hole 211 and the second transmission portion 311 with the first transmission portion 2341, thereby completing the simultaneous installation of the retaining ring 400 and the transmission base 310. In the present application, the axial hole 211 is provided with a first positioning tooth portion 2111 extending axially, and the retaining ring 400 is provided with a plurality of second positioning tooth portions 410 at intervals on the outer circumference. Such an arrangement allows the retaining ring 400 to slide more easily into the axial hole 211. The staff only needs to align the first transmission portion 2341 with the second transmission portion 311, thereby conveniently completing the assembly connection between the transmission base 310 and the connecting base 234, and between the retaining ring 400 and the main drive shaft 210.

[0100] Furthermore, the second clutch teeth 2321 of the clutch member 232 and the second positioning tooth portion 410 of the limiting ring 400 are provided in equal numbers. For example, the second clutch teeth 2321 of the clutch member 232 and the second positioning tooth portion 410 of the limiting ring 400 are each provided with 1 or 2. It is understood that the circumferential teeth of the limiting ring 400 preferably correspond to the number of equal divisions of the dosage scale. The angle of each metering unit is synchronized. During assembly, the raised ratchet teeth or cams and the recessed ratchet teeth or cam grooves (i.e., the first positioning tooth portion 2111 and the second positioning tooth portion 410) mesh without interference due to angle mismatch. When the number of mating protrusions or grooves is the minimum, positional alignment is required for assembly. If the number is less than 100 equal divisions, alignment is required for complete assembly. Of course, a mating structure with more than 100 equal divisions, while more precise, can also achieve assembly without interference or jamming. However, considering the size of the product and the degree of precision that can be achieved in the processing of component materials, a more precise and equal division structure is not particularly preferred.

[0101] In one possible embodiment, referring to Figures 4, 7, and 8, a fixed sleeve 700 is axially plugged and fixed to the inner side of the housing 100. The fixed sleeve 700 is sleeved on the outer side of the torsion spring 220, and the front end of the fixed sleeve 700 is connected to the clutch assembly 230 and the inner side of the housing 100. Specifically, the fixed sleeve 700 includes a sleeve portion 710, a front ring portion 720, and a rear ring portion 730. The sleeve portion 710 is located on the outer side of the torsion spring 220. The front ring portion 720 is connected to the front end of the sleeve portion 710 and protrudes radially outward. The front ring portion 720 is axially plugged and connected to the inner circumferential surface of the housing 100. A first circumferential limit portion 741 is provided at the end of the front ring portion 720 to circumferentially limit the arrangement with a second circumferential limit portion 2313 on the rear end of the clutch base 231. The rear ring portion 730 is connected to the rear end of the sleeve portion 710 and protrudes radially inward. The rear end of the main drive shaft 210 is rotatably inserted into the rear ring portion 730. The rear ring portion 730 defines a second hooking hole 731. The rear end of the torsion spring 220 is hooked into the second hooking hole 731, thereby connecting to the inner side of the housing 100. The transmission sleeve 500 is sleeved on the outer side of the sleeve portion 710.

[0102] In other possible embodiments, a fixed sleeve 700 (not shown in the figure) is integrally provided on the inner side of the shell 100, and the fixed sleeve 700 is sleeved on the outer side of the torsion spring 220. The end of the fixed sleeve 700 close to the clutch assembly 230 is spaced apart in the circumferential direction with a first circumferential limiting portion 741. The transmission sleeve 500 is rotatably sleeved on the fixed sleeve 700, and the front end of the torsion spring 220 is connected to the main drive shaft 210, and the rear end is connected to the fixed sleeve 700.

[0103] It is understood that the inner side of the housing 100 is axially plugged and fixed with a fixed sleeve 700, which is integrated into the inner side of the housing 100 compared to the fixed sleeve 700. During the assembly of the syringe, the main drive shaft 210, the clutch assembly 230, the torsion spring 220, and the transmission sleeve 500 can be installed on the fixed sleeve 700, and then the fixed sleeve 700 is installed on the inner side of the housing 100, thereby conveniently assembling the main drive shaft 210, the clutch assembly 230, the torsion spring 220, and the transmission sleeve 500 on the inner side of the housing 100. This arrangement allows workers to complete the assembly of the syringe conveniently, thereby ensuring the production efficiency of the syringe.

[0104] It can be understood that the rear end of the torsion spring 220 is connected to the rear end of the fixed sleeve 700, which is equivalent to being connected to the inner side of the shell 100. With this arrangement, the user can complete the force storage of the torsion spring by rotating the main drive shaft 210. The force storage of the torsion spring 220 is more flexible and easier to operate.

[0105] Furthermore, the inner circumferential surface of the housing 100 is provided with a plurality of third circumferential limiting portions 122 at intervals in the circumferential direction, and the end of the front ring portion 720 away from the clutch assembly 230 is provided with a plurality of fourth circumferential limiting portions 721 at intervals in the circumferential direction. The third circumferential limiting portions 122 are pluggably engaged with the fourth circumferential limiting portions 721. Thus, when the first circumferential limiting portion 741 is axially pluggably engaged with the second circumferential limiting portion 2313, the fixed sleeve 700 and the housing 100 are circumferentially constrained, preventing relative rotation between the two, thereby limiting the rotation of the clutch assembly 230. Furthermore, the fixed sleeve 700 and the housing 100 are connected in the aforementioned manner, allowing the fixed sleeve 700 to be conveniently assembled inside the housing 100, thereby facilitating the installation of the main drive shaft 210, the clutch assembly 230, the torsion spring 220, and the transmission sleeve 500.

[0106] Furthermore, referring to Figure 8 , a third guide surface is provided at the front end of the third circumferential limit portion 122, which is used to circumferentially guide the fourth circumferential limit portion 721; and / or a fourth guide surface is provided at the rear end of the fourth circumferential limit portion 721, which is used to axially guide the third circumferential limit portion 122. The third and fourth guide surfaces can be curved guide surfaces or inclined guide surfaces. It is understood that when the fourth circumferential limit portion 721 is again plugged into and mated with the third circumferential limit portion 122, the third and fourth guide surfaces provide circumferential guidance to each other, thereby ensuring that the fourth circumferential limit portion 721 can smoothly plug into and mated with the third circumferential limit portion 122, thereby facilitating assembly of the fixing sleeve 700 within the housing 100.

[0107] To further position the fixing sleeve 700 and the connecting seat 234 of the clutch assembly 230, in some embodiments, referring to Figures 5 and 6, a first protruding ring portion 740 is provided at the end of the fixing sleeve 700, and a first circumferential limiting portion 741 is arranged on the outer circumference of the first protruding ring portion 740. Simultaneously, a second protruding ring portion 2312 is provided at the end of the clutch assembly 230, and a second circumferential limiting portion 2313 is arranged on the inner circumference of the second protruding ring portion 2312. The outer circumference of the first protruding ring portion 740 is gradually contracted, while the inner circumference of the second protruding ring portion 2312 is gradually expanded, thereby adapting the outer circumference of the first protruding ring portion 740 to the inner circumference of the second protruding ring portion 2312. It can be understood that when the fourth circumferential limit portion 721 is again plugged into and fitted with the third circumferential limit portion 122, the outer circumference of the first convex ring portion 740 has a guiding effect on the inner circumference of the second convex ring portion 2312, thereby ensuring that the second circumferential limit portion 2313 can be smoothly plugged into and fitted with the first circumferential limit portion 741.

[0108] In some embodiments, referring to FIG7 , the syringe further comprises a knob 130 and a button 140, wherein the outer ring of the knob 130 is rotatably sleeved on the rear end portion of the housing 100. For example, the inner circumferential surface of the outer ring of the knob 130 is provided with a second rotation protrusion 131, and the outer circumferential surface of the rear end portion of the rear shell 120 is provided with a second rotation groove 125, and the second rotation protrusion 131 is rotatably embedded in the second rotation groove 125 (refer to FIG11 and FIG12 ), thereby, the knob 130 is rotatably connected to the rear end portion of the housing 100. In addition, the inner ring of the knob 130 is circumferentially restricted to the rear end portion of the main drive shaft 210. For example, the rear end portion of the main drive shaft 210 has a strip protrusion, and the inner circumferential surface of the inner ring of the knob 130 has a strip groove, and the strip protrusion is embedded in the strip groove, thereby, the knob 130 and the rear end portion of the main drive shaft 210 are circumferentially restricted. The compression spring 150 is held between the knob 130 and the button 140 to push the button 140 to return to its original position.

[0109] During use, the user can rotate the knob 130 forward to drive the main drive shaft 210 to rotate forward, thereby adjusting the scale sleeve 600 and storing force in the torsion spring 220. Furthermore, the user can press the button 140 forward to push the main drive shaft 210 forward, thereby releasing the restriction of the clutch assembly 230 by the housing 100 (see FIG. 4 ). As a result, the main drive shaft 210 drives the transmission base 310 to rotate via the clutch assembly 230.

[0110] Further, referring to Figures 7 and 11, a third elastic arm 123 is circumferentially extended from the rear end of the shell 100, and a third protrusion 124 protrudes outward from the end of the third elastic arm 123. The inner wall of the knob 130 abuts against the third protrusion 124, so that the third elastic arm 123 elastically deforms inward from the initial state to a locked state; wherein, the third elastic arm 123 has a circumferentially oriented first abutting end 1231, and the scale sleeve 600 has a circumferentially oriented second abutting end 610, and when the third elastic arm 123 is in the locked state, the second abutting end 610 can abut against the first abutting end 1231.

[0111] During the dose adjustment phase, the zero scale line of the scale sleeve 600 is located at the observation port 121. The medical professional rotates the main drive shaft 210 in the forward direction, which drives the scale sleeve 600 in synchronous forward rotation. Because the inner side of the scale sleeve 600 slides axially with the main drive shaft 210 and the outer side of the scale sleeve 600 is threadedly connected to the first housing 100, the scale sleeve 600 slides backward along the axial direction of the first housing 100 when the main drive shaft 210 drives the scale sleeve 600 in forward rotation. The observation port 121 is used to monitor the dose adjustment. The greater the dose adjustment, the larger the scale value of the corresponding scale line of the observation port 121. When the medical staff observes that the scale value on the observation port 121 reaches the maximum scale value, for example, 80UI on the scale sleeve 600, the second abutting end 610 of the scale sleeve 600 abuts the first abutting end 1231 of the third elastic arm 123, the scale sleeve 600 stops rotating, and the injection dose of the syringe is adjusted to the maximum injection volume. During the drug injection phase, the main drive shaft 210 rotates in the opposite direction, driving the scale sleeve 600 to rotate in the opposite direction synchronously, and the scale sleeve 600 moves axially forward. The observation port 121 is used to monitor the injection of the drug. When the observation port 121 displays the zero scale line, the syringe has just injected the preset drug volume.

[0112] Furthermore, a stop protrusion 722 is provided on the sidewall of the front end of the fixed sleeve 700, more specifically, on the inner sidewall of the front ring portion 720 (see FIG8 ). The front end of the scale sleeve 600 has a circumferentially oriented abutment end. When the abutment end abuts against the side of the stop protrusion 722, the observation port 121 displays the zero mark on the scale sleeve 600, indicating that the injection of the medicine is complete.

[0113] The technical means disclosed in the present application are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of the present application, and such improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A syringe, characterized in that: include: case; A driving mechanism is axially slidably disposed on the housing so as to release the restriction of the housing on the driving mechanism; The extrusion mechanism comprises a transmission seat and an extrusion screw, wherein the extrusion screw is threadedly connected to the inner side of the housing, the transmission seat is rotatably arranged on the housing and sleeved on the outer side of the extrusion screw, and the transmission seat and the extrusion screw are circumferentially restricted; Wherein, the driving mechanism is configured to always maintain a circumferential restriction setting with the transmission seat during axial sliding, and the driving mechanism is used to drive the transmission seat to rotate when the restriction is released.

2. A syringe according to claim 1, characterized in that: The driving mechanism is provided with first transmission parts at intervals in the circumferential direction, and the transmission seat is provided with second transmission parts at intervals in the circumferential direction. The first transmission parts and the second transmission parts are provided with circumferential restriction and axial sliding.

3. A syringe according to claim 2, characterized in that: The inner side of the shell is spaced apart with a first circumferential limiting portion in the circumferential direction, and the driving mechanism is spaced apart with a second circumferential limiting portion in the circumferential direction. The first circumferential limiting portion and the second circumferential limiting portion are circumferentially limited and axially slidably arranged. The length of the first circumferential limiting portion and the second circumferential limiting portion in the axial direction is smaller than the length of the first transmission portion and the second transmission portion in the axial direction. The first circumferential limiting portion and the second circumferential limiting portion can be axially separated to release the circumferential limitation of the driving mechanism.

4. A syringe according to claim 3, characterized in that: The end of the first circumferential limiting portion is provided with a first guide surface for guiding the second circumferential limiting portion; And / or, the end portion of the second circumferential limiting portion is provided with a second guide surface for guiding the first circumferential limiting portion.

5. A syringe according to claim 3, characterized in that: The driving mechanism comprises: A main drive shaft, disposed inside the housing; A torsion spring is sleeved on the outside of the main drive shaft and is connected to the housing. and connected to the main drive shaft; A clutch assembly, the clutch assembly being rotationally connected to the main drive shaft so as to be able to synchronously slide axially with the main drive shaft; Among them, the clutch assembly is provided with the second circumferential limiting portion and the first transmission portion in the circumferential direction. When the first circumferential limiting portion and the second circumferential limiting portion are circumferentially limited, the clutch assembly is used to maintain the position of the main drive shaft after rotation adjustment; when the first circumferential limiting portion and the second circumferential limiting portion are axially separated, the main drive shaft drives the transmission seat to rotate through the clutch assembly.

6. A syringe according to claim 5, characterized in that: The clutch assembly comprises: A clutch base, sleeved on the main drive shaft, the clutch base being provided with the second circumferential limiting portion in the circumferential direction; A clutch member is sleeved on the main drive shaft, the main drive shaft is provided with first clutch teeth at intervals in the circumferential direction, the clutch member is provided with second clutch teeth in the circumferential direction, and the first clutch teeth are meshed with the second clutch teeth; an elastic member, one end of which is abutted against the clutch base, and the other end of which is abutted against the clutch member, so that the first clutch tooth and the second clutch tooth are kept in meshing relationship; The connecting seat is connected to the clutch base and is rotationally connected to the main driving shaft. The connecting seat is provided with the first transmission part in the circumferential direction.

7. A syringe according to claim 6, characterized in that: The connecting seat is snap-connected to the clutch base.

8. A syringe according to claim 6, characterized in that: The first transmission parts are sequentially arranged on the inner circumferential surface of the connecting seat, and the outer arc surface of the second transmission part is arranged in close contact with the inner circumferential surface of the connecting seat.

9. A syringe according to claim 6, characterized in that: The end of the main driving shaft close to the transmission seat is provided with an annular convex edge, and the end of the annular convex edge away from the transmission seat is provided with the first clutch teeth at intervals in the circumferential direction; The annular convex edge is provided with a first rotation groove on the outer circumference, and the inner circumference of the connecting seat is provided with a first rotation protrusion, and the first rotation protrusion is rotatably embedded in the first rotation groove; The annular convex edge is provided with a first hooking hole, and one end of the torsion spring is hooked in the first hooking hole.

10. A syringe according to claim 6, characterized in that: One of the clutch base and the clutch member is provided with a first tooth portion in a circumferential direction, and the other is provided with a first elastic arm, the end of the first elastic arm has a first protrusion, the first protrusion is embedded in the tooth groove of the first tooth portion, and can slide axially; wherein, in a circumferential direction of the main drive shaft, the resistance between the first clutch tooth and the second clutch tooth is smaller than the resistance between the first tooth portion and the first protrusion; in another circumferential direction of the main drive shaft, the resistance between the first clutch tooth and the second clutch tooth is greater than the resistance between the first tooth portion and the first protrusion.

11. A syringe according to claim 5, characterized in that: The syringe comprises: A transmission sleeve, rotatably disposed inside the housing and circumferentially limited with the main drive shaft, so as to be able to rotate synchronously with the main drive shaft; The scale sleeve is arranged on the inner side of the shell and is threadedly connected to the inner side of the shell. The scale sleeve is sleeved on the outer side of the transmission sleeve and is circumferentially restricted so that it can rotate synchronously with the transmission sleeve. The side wall of the shell is provided with an observation port for observing the scale of the scale sleeve.

12. A syringe according to claim 11, characterized in that: A fixing sleeve is integrally provided on the inner side of the shell, and the fixing sleeve is sleeved on the outer side of the torsion spring. The first circumferential limiting portion is spaced apart in the circumferential direction at one end of the fixing sleeve close to the clutch assembly. The transmission sleeve is rotatably sleeved on the fixing sleeve, and the front end of the torsion spring is connected to the main drive shaft, and the rear end is connected to the fixing sleeve.

13. A syringe according to claim 11, characterized in that: A fixed sleeve is axially plugged and fixed on the inner side of the shell, and the fixed sleeve is sleeved on the outer side of the torsion spring. The first circumferential limiting portion is spaced apart in the circumferential direction at one end of the fixed sleeve close to the clutch assembly, and the transmission sleeve is rotatably sleeved on the fixed sleeve, and the front end of the torsion spring is connected to the main drive shaft, and the rear end is connected to the fixed sleeve.

14. A syringe according to claim 13, characterized in that: A third circumferential limiting portion is arranged on the inner circumferential surface of the shell, a fourth circumferential limiting portion is arranged on the side of the fixing sleeve, and the third circumferential limiting portion is axially plug-fitted with the fourth circumferential limiting portion.

15. A syringe according to claim 14, characterized in that: The end of the third circumferential limiting portion is provided with a third guide surface for guiding the fourth circumferential limiting portion; And / or, a fourth guide surface for guiding the third circumferential limiting portion is provided at an end portion of the fourth circumferential limiting portion.

16. A syringe according to any one of claims 13 to 15, characterized in that The end of the fixed sleeve is provided with a first convex ring portion, the outer circumference of the first convex ring portion is gradually contracted, and the first circumferential limit portion is arranged on the outer circumference of the first convex ring portion; A second convex ring portion is disposed at the end of the clutch assembly, the inner circumference of the second convex ring portion is gradually enlarged, and the second circumferential limiting portion is arranged on the inner circumference of the second convex ring portion.

17. A syringe according to claim 11, characterized in that: The main drive shaft is provided with an axial hole along its central axis, and a guide port is formed at the end of the main drive shaft close to the transmission seat, and the inner wall of the axial hole is provided with a limiting surface facing the guide port; The syringe further comprises a limiting ring, which is threadedly connected to the extrusion screw, and the limiting ring is axially slidably arranged in the axial hole and is circumferentially limited with the main driving shaft.

18. A syringe according to claim 17, characterized in that: A first positioning tooth portion is axially extended on the inner circumference of the axial hole, and a plurality of second positioning tooth portions are sequentially and spaced apart on the outer circumference of the limiting ring. The first positioning tooth portion is axially slidably disposed in the tooth groove of the second positioning tooth portion.

19. A syringe according to claim 11, characterized in that: The syringe also includes: A knob, rotatably sleeved on the rear end of the housing, and circumferentially restricted with the rear end of the main drive shaft; A button, on which the rear end of the knob is axially slidably disposed and abuts against the rear end of the main drive shaft; A compression spring, held between the knob and the button, and used to push the button to reset backwards; A third elastic arm is circumferentially extended at the rear end of the shell, a third protrusion protrudes outward at the end of the third elastic arm, and the inner wall of the knob abuts against the third protrusion, so that the third elastic arm is elastically deformed inward from the initial state to the locked state; The three elastic arms have a first abutting end facing in a circumferential direction, and the scale sleeve has a second abutting end facing in a circumferential direction. When the third elastic arm is in the locked state, the second abutting end can abut against the first abutting end.

20. A syringe according to claim 1, characterized in that: The extrusion mechanism also includes a nut seat, the nut seat is connected to the shell, and the extrusion screw is threadedly connected to the nut seat.

21. A syringe according to claim 20, characterized in that: One of the nut seat and the transmission seat is provided with a second tooth portion in the circumferential direction, and the other is provided with a second elastic arm, and a second protrusion is provided at the end of the second elastic arm, and the second protrusion is embedded in the tooth groove of the second tooth portion.

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