Syringe

Abstract

The utility model discloses an injector which comprises a shell, a driving mechanism and an extrusion mechanism, and the driving mechanism is axially arranged on the shell in a sliding mode so that the limitation of the shell on the driving mechanism can be relieved; the extrusion mechanism comprises a transmission seat and an extrusion screw rod, the extrusion screw rod is in threaded connection with the inner side of the shell, the transmission seat is rotationally arranged on the shell and arranged on the outer side of the extrusion screw rod in a sleeving mode, and the transmission seat and the extrusion screw rod are arranged in a circumferential limiting mode; wherein the driving mechanism is configured to be in circumferential limiting arrangement with the transmission seat all the time during axial sliding, and the driving mechanism is used for driving the transmission seat to rotate when limitation is relieved. It can be understood that when the injector is started and stopped, the driving mechanism and the transmission base are always kept in a synchronous state, so that it is guaranteed that the rotating angle of the driving mechanism is matched with the moving distance of the extrusion screw, and therefore the injector can accurately control the injection amount of the injector through the driving mechanism.

Description

[0001] This application claims the priority of 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”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The utility model 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 to each other, 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, it is easy to cause the actual injection volume of the syringe to exceed the driving volume of the driving mechanism, so that the user may inject too much small amount of medicine into the human body. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a syringe to ensure the accuracy of injection.

[0007] The present application embodiment provides a syringe, comprising:

[0008] case;

[0009] A driving mechanism is axially slidably disposed on the housing so as to release the restriction of the housing on the driving mechanism;

[0010] 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;

[0011] 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.

[0012] According to some embodiments of the utility model, 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.

[0013] According to some embodiments of the utility model, 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 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, and the first circumferential limiting portion and the second circumferential limiting portion can be axially separated to release the circumferential restriction of the driving mechanism.

[0014] According to some embodiments of the present utility model, the end of the first circumferential limiting portion is provided with a first guide surface for guiding the second circumferential limiting portion;

[0015] And / or, the end of the second circumferential limiting portion is provided with a second guide surface for guiding the first circumferential limiting portion.

[0016] According to some embodiments of the present utility model, the driving mechanism comprises:

[0017] A main drive shaft, disposed inside the housing;

[0018] A torsion spring, wherein the torsion spring is sleeved on the outside of the main drive shaft and connected to the housing and the main drive shaft;

[0019] 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;

[0020] 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.

[0021] According to some embodiments of the present utility model, the clutch assembly includes:

[0022] A clutch base, sleeved on the main drive shaft, the clutch base being provided with the second circumferential limiting portion in the circumferential direction;

[0023] 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;

[0024] 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;

[0025] 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.

[0026] According to some embodiments of the present invention, the connecting seat is snap-connected to the clutch base.

[0027] According to some embodiments of the present invention, 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.

[0028] According to some embodiments of the utility model, an annular convex edge is provided at the end of the main driving shaft close to the transmission seat, the first transmission part is arranged at intervals at the end of the annular convex edge close to the transmission seat in the circumferential direction, and the first clutch teeth are arranged at intervals at the other end in the circumferential direction;

[0029] 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;

[0030] 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.

[0031] According to some embodiments of the utility model, 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.

[0032] According to some embodiments of the present invention, the syringe comprises:

[0033] 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;

[0034] 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.

[0035] According to some embodiments of the utility model, a fixing sleeve is integrally provided on the inner side of the shell, 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.

[0036] According to some embodiments of the utility model, a fixed sleeve is axially plugged and fixed on the inner side of the shell, 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 utility model, a third circumferential limiting portion is provided on the inner circumferential surface of the shell, 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.

[0038] According to some embodiments of the present utility model, the end of the third circumferential limiting portion is provided with a third guide surface for guiding the fourth circumferential limiting portion;

[0039] 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.

[0040] According to some embodiments of the utility model, 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;

[0041] 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.

[0042] According to some embodiments of the utility model, 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;

[0043] 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.

[0044] According to some embodiments of the utility model, a first positioning tooth portion is axially extended on the inner circumference of the axial hole, a plurality of second positioning teeth portions are sequentially arranged on the outer circumference of the limiting ring, and the first positioning tooth portion is axially slidably arranged in the tooth groove of the second positioning tooth portion.

[0045] According to some embodiments of the present invention, the syringe further comprises:

[0046] A knob, rotatably sleeved on the rear end of the housing, and circumferentially restricted with the rear end of the main drive shaft;

[0047] 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;

[0048] A compression spring, held between the knob and the button, and used to push the button to reset backwards;

[0049] wherein, a third elastic arm is circumferentially extended at the rear end portion of the shell, a third protrusion is protruded 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 is elastically deformed inward from an 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.

[0050] According to some embodiments of the utility model, the extrusion mechanism further includes a nut seat, the nut seat is connected to the housing, and the extrusion screw is threadedly connected to the nut seat.

[0051] According to some embodiments of the utility model, 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, 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.

[0052] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages: the drive mechanism and the transmission seat always maintain a circumferentially restricted state, that is, when the shell 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, more precisely, when the shell releases the restriction on the drive mechanism and restricts the rotation of the drive mechanism again, the drive mechanism and the transmission seat always maintain a synchronous state, thereby ensuring that the rotation angle of the drive mechanism is compatible with the moving distance of the extrusion screw, so that the syringe can use the drive mechanism to accurately control the injection volume of the syringe. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the overall structure of the syringe according to an embodiment of the utility model;

[0054] Figure 2 This is a schematic diagram of the axial cross-sectional structure of a syringe according to an embodiment of the utility model;

[0055] Figure 3 It is a schematic diagram of the assembly structure of the driving mechanism and the extrusion mechanism of an embodiment of the utility model;

[0056] Figure 4 It is a schematic diagram of the exploded structure of the driving mechanism and the extrusion mechanism of the embodiment of the utility model;

[0057] Figure 5 for Figure 4 A schematic diagram of the structure from another angle;

[0058] Figure 6 It is a schematic structural diagram of a clutch assembly according to an embodiment of the utility model;

[0059] Figure 7 A schematic diagram of a partial explosion structure of a syringe according to an embodiment of the utility model;

[0060] Figure 8 It is a structural schematic diagram of a fixed sleeve, a transmission sleeve, a scale sleeve and a rear shell of an embodiment of the utility model;

[0061] Fig. 9 It is a schematic diagram of the exploded structure of the main drive shaft, the extrusion screw and the limit ring of the embodiment of the utility model;

[0062] Fig.10 This is a schematic diagram of the axial cross-sectional structure of the main drive shaft of the embodiment of the utility model

[0063] Fig.11 It is a schematic diagram of the exploded structure of the rear shell, torque and button of an embodiment of the utility model;

[0064] Fig.12It is a schematic structural diagram of a knob according to an embodiment of the utility model.

[0065] The meanings of the reference numerals are as follows:

[0066] 100, housing; 110, front housing; 120, rear housing; 121, observation port; 122, third circumferential limit 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 convex edge; 2121, first clutch tooth; 2122, first rotation groove; 2143, first hook hole; 220, torsion spring; 230, clutch assembly; 231, clutch base; 2311, first tooth portion; 2312, second convex ring portion; 2313, second circumferential limiting portion; 232, clutch member; 2321, first Second clutch tooth; 2322, first elastic arm; 2323, first protrusion; 233, elastic member; 234, connecting seat; 2341, first transmission part; 2342, first rotating protrusion; 300, extrusion mechanism; 310, transmission seat; 311, second transmission part; 312, guide protrusion; 313, second elastic arm; 314, second protrusion; 320, extrusion screw; 321, guide groove; 330, screw Female 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

[0067] The embodiments of the present invention are described in detail below, and 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 invention, and cannot be understood as limiting the present invention.

[0068] In the description of the present invention, 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, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention.

[0069] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0070] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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 the present invention based on the specific content of the technical solution.

[0071] In the description of the utility model, the description with 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 the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0073] See also Figure 1 As shown in the figure, a syringe provided by an embodiment of the utility model includes 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 so as 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.

[0074] In the specific application process, the driving mechanism 200 slides forward axially, and the housing 100 releases the restriction on the driving mechanism 200. The driving mechanism 200 can drive the transmission seat 310 to rotate circumferentially, and the transmission seat 310 drives the extrusion screw 320 to rotate synchronously; and because the extrusion screw 320 is threadedly connected to the housing 100, the extrusion screw 320 moves forward axially 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 driving mechanism 200 moves backward, and the housing 100 again restricts the driving mechanism 200 circumferentially, and the driving mechanism 200 stops driving the transmission seat 310, and the transmission seat 310 stops driving the extrusion screw 320, thereby, the syringe stops injecting the reagent into the human body.

[0075] 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 and when the housing 100 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, more precisely, when the housing 100 releases the restriction on the drive mechanism 200 and restricts the rotation of the drive mechanism 200 again, the drive mechanism 200 and the transmission seat 310 always maintain a synchronous state, thereby ensuring that the rotation angle of the drive mechanism 200 is compatible with the moving distance of the extrusion screw 320, so that the syringe can use the drive mechanism 200 to accurately control the injection volume of the syringe.

[0076] In order to realize 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 Figure 4 and Fig. 9 ), the guide protrusion 312 is slidably embedded in the guide groove 321, thereby, the extrusion screw 320 and the transmission seat 310 are circumferentially restricted and can slide axially along the transmission seat 310.

[0077] In some embodiments, reference Figures 2 to 4 The drive mechanism 200 is provided with first transmission parts 2341 at intervals in the circumferential direction (refer to Figure 5), or in other words, the first transmission part 2341 is arranged in sequence around the central axis of the drive mechanism 200; the transmission seat 310 is provided with the second transmission part 311 at intervals in the circumferential direction, or in other words, the second transmission part 311 is arranged in sequence around the central axis of the transmission seat 310. The first transmission part 2341 and the second transmission part 311 are axially plugged in and matched, thereby, the first transmission part 2341 and the second transmission part 311 are circumferentially restricted and can slide axially relative to each other. It can be understood that the first transmission part 2341 and the second transmission part 311 have sufficient length in the axial direction, and when the drive mechanism 200 slides axially, the first transmission part 2341 and the second transmission part 311 always maintain a fit state in the circumferential direction, thereby, the main drive shaft 210 and the transmission seat 310 always maintain a circumferential restriction setting, thereby ensuring the synchronization between the drive mechanism 200 and the transmission seat 310.

[0078] Further, the inner side of the housing 100 is provided with first circumferential limiting portions 741 at intervals in the circumferential direction, or the first circumferential limiting portions 741 are arranged in sequence around the central axis of the housing 100; the driving mechanism 200 is provided with second circumferential limiting portions 2313 at intervals in the circumferential direction, or the second circumferential limiting portions 2313 are arranged in sequence around the central axis of the driving mechanism 200. The first circumferential limiting portion 741 and the second circumferential limiting portion 2313 are axially plugged and matched, and the first circumferential limiting portion 741 and the second circumferential limiting portion 2313 are circumferentially limited and can slide relative to each other axially, thereby, the housing 100 circumferentially limits the rotation of the driving mechanism 200. It can be understood that when the driving mechanism 200 moves forward axially, the first circumferential limiting portion 741 and the second circumferential limiting portion 2313 are axially separated, and the housing 100 releases the restriction on the driving mechanism 200, and the driving mechanism 200 can drive the transmission seat 310 to rotate, and the syringe injects the medicine 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 housing 100 limits the rotation of the driving mechanism 200 again, 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.

[0079] Among them, the length of the first circumferential limit portion 741 and the second circumferential limit 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 limit setting.

[0080] Further, the front end of the first circumferential limit portion 741 is provided with a first guide surface, and the first guide surface is used to circumferentially guide the second circumferential limit portion 2313; and / or, the rear end of the second circumferential limit portion 2313 is provided with a second guide surface, and the second guide surface is used to axially guide the first circumferential limit portion 741. Among them, the first guide surface and the second guide surface can be guide arc surfaces or guide inclined surfaces. It can be understood that when the second circumferential limit portion 2313 is plugged and matched with the first circumferential limit portion 741 again, 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 plugged and matched with the first circumferential limit portion 741 smoothly.

[0081] In some embodiments, reference 3 to Figure 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 protrudes outwardly with an annular convex edge 212, the torsion spring 220 is sleeved on the outer side of the main drive shaft 210, and the front end of the torsion spring 220 is hooked in the first hooking hole 2143 on the annular convex edge 212 (refer to Fig. 9 ), and the other end is connected to the inner side of the housing 100, so as to enable the main drive shaft 210 to have a rotational force to reset after rotation adjustment. The clutch assembly 230 is connected to the housing 100 and the main drive shaft 210, so as to maintain the position of the main drive shaft 210 after rotation adjustment, thereby the torsion spring 220 can store force. At the same time, the clutch assembly 230 is rotationally connected to the main drive shaft 210 so as to be able to synchronously slide axially with the main drive shaft 210.

[0082] Among them, the inner side of the housing 100 is spaced apart with a first circumferential limit portion 741 in the circumferential direction, and the end of the clutch assembly 230 away from the transmission seat 310 is spaced apart with a second circumferential limit portion 2313 in the circumferential direction. The first circumferential limit portion 741 and the second circumferential limit portion 2313 are axially plugged and matched, and the two are circumferentially restricted. Therefore, the housing 100 restricts the relative rotation of the clutch assembly 230 through the first circumferential limit portion 741, thereby restricting the rotation of the main drive shaft 210. At the same time, the end of the clutch assembly 230 close to the transmission seat 310 is provided with a first transmission portion 2341 in the circumferential direction to always maintain a circumferential restriction setting with the second circumferential limit portion 2313 of the transmission seat 310.

[0083] Specifically, in the energy storage stage, the first circumferential limit portion 741 and the second circumferential limit portion 2313 are in a circumferentially restricted state in the circumferential direction, and the staff reversely rotates and adjusts the main drive shaft 210, and the torsion spring 220 is charged. After the rotation adjustment of the main drive shaft 210 is completed, 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. In the driving stage, to overcome the elastic force of the torsion spring 220 in the axial direction, the staff presses the main drive shaft 210 axially forward, and 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 the restriction 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.

[0084] 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 seat 234, wherein the clutch base 231 is sleeved on the main drive shaft 210, and the second circumferential limiter 2313 is arranged at intervals in the circumferential direction at one end of the clutch base 231 away from the transmission seat 310. An annular convex edge 212 protrudes outward from the end of the main drive shaft 210 close to the transmission seat 310, and the first clutch teeth 2121 are arranged at intervals in the circumferential direction at the end of the annular convex edge 212 away from the transmission seat 310. The clutch member 232 is sleeved on the outer side of the main drive shaft 210 and is located between the clutch base 231 and the annular convex edge 212. The second clutch teeth 2321 are arranged at one end of the clutch member 232 close to the annular convex edge 212 in the circumferential direction, and the first clutch teeth 2121 are meshed with the second clutch teeth 2321. The elastic member 233 is sleeved on the main drive shaft 210, and one end of the elastic member 233 abuts against the clutch base 231, and the other end abuts against the clutch member 232, so that the elastic member 233 keeps the first clutch tooth 2121 and the second clutch tooth 2321 in mesh. The connecting seat 234 is connected to the clutch base 231, such as a snap connection, and the connecting seat 234 is rotatably connected to the annular convex edge 212, for example, the outer circumference of the annular convex edge 212 is provided with a first rotation groove 2122, and the inner circumference of the connecting seat 234 is provided with a first rotation protrusion 2342, and the first rotation protrusion 2342 is rotatably embedded in the first rotation groove 2122. At the same time, the end of the connecting seat 234 close to the transmission seat 310 is provided with a first transmission part 2341 in the circumferential direction to always maintain a circumferential restriction setting with the second circumferential limit part 2313 of the transmission seat 310.

[0085] 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 in a direction away from the first clutch tooth 2121, so that the first clutch tooth 2121 rotates relative to the second clutch tooth 2321. When the main drive shaft 210 stops rotating, under the action of the elastic member 233, the first clutch tooth 2121 meshes with the second clutch tooth 2321, so that the main drive shaft 210 is kept in the position after the rotation adjustment.

[0086] It is understandable that the connecting seat 234 is snap-connected with 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 .

[0087] Furthermore, a plurality of first tooth portions 2311 are arranged at intervals in the circumferential direction on the inner side of the clutch base 231, and a first elastic arm 2322 is circumferentially extended on the side of the clutch member 232, and a first protrusion 2323 protrudes outward from the end of the first elastic arm 2322, and the first protrusion 2323 is embedded in the tooth groove of the adjacent first tooth portion 2311 and can slide axially along the tooth groove. Of course, the first elastic arm 2322 can also be arranged on the clutch base 231, and the clutch member 232 is provided with a first tooth groove, which is not described in detail. In which, in the reverse direction of the main drive shaft 210, more specifically, 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 specifically, in the torsion direction of the torsion spring 220, the resistance between the first clutch tooth 2121 and the second clutch tooth 2321 is larger than the resistance between the first protrusion 2323 and the first tooth portion 2311.

[0088] 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 is smaller than the resistance between the first protrusion 2323 and the first tooth portion 2311, and thus the clutch member 232 overcomes the elastic force of the elastic member 233 and moves in a direction away from the first clutch tooth 2121. Therefore, 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, so that the main drive shaft 210 is kept in the position after the rotation adjustment. When it is necessary to correct the adjusted position of the main drive shaft 210, the user rotates the main drive shaft 210 in the forward direction, 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.

[0089] 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 arranged to fit the inner circumferential surface of the connecting seat 234, thereby further locating 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.

[0090] In some embodiments, reference Figure 3 and Figure 4 The extrusion mechanism 300 further includes a nut seat 330, and the extrusion screw 320 is inserted into the inner ring 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 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 (refer to Figure 1 and Figure 2), the front end of the rear shell 120 is assembled on the outside 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 assembled on the rear shell 120, the inner side of the front shell 110 is used to accommodate the reagent bottle, and the action 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 shell 120 is provided with a button 140 and a knob 130, the button 140 facilitates the pressing of the main drive shaft 210, and the knob 130 facilitates the rotation of the main drive shaft 210, which will be described in detail later.

[0091] Furthermore, the outer ring body of the nut seat 330 is provided with second teeth 331 at intervals on the inner circumference, and the side of the transmission seat 310 is provided with a second elastic arm 313 extending circumferentially, and the end of the second elastic arm 313 protrudes outward with a second protrusion 314, and the second protrusion 314 is embedded in the tooth groove 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 is provided on the transmission seat 310, which is not 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 to each tooth groove of the second teeth 331 in sequence, so that the syringe makes a sound and / or produces a slight vibration during the injection process, so as to remind the medical staff that the syringe is injecting medicine into the patient normally.

[0092] In some embodiments, reference Figure 7 and Figure 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 of the main drive shaft 210 has strip grooves arranged at intervals on the outer circumference, and the transmission sleeve 500 has strip protrusions arranged at intervals on the inner circumference, and the strip protrusions are slidably embedded in the strip grooves. Therefore, the transmission sleeve 500 and the main drive shaft 210 are circumferentially restricted. The scale sleeve 600 is at least partially sleeved on the outside of the transmission sleeve 500 and is circumferentially restricted so as to be able to rotate synchronously with the transmission sleeve 500. For example, a strip groove is provided on the outer circumference of the transmission sleeve 500 along its axial direction, and a strip protrusion is provided on the inner circumference of the scale sleeve 600 along its axial direction. The strip protrusion is slidably embedded in the strip groove, thereby, the transmission sleeve 500 and the scale sleeve 600 are circumferentially restricted and can slide relative to each other in the axial direction. The side wall of the rear end of the housing 100 is provided with an observation port 121, through which the user observes the scale of the scale sleeve 600.

[0093] Further, refer to Figure 3 , Fig. 9 and Fig.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 close to 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 limit surface 2112 facing the guide port 2113. The syringe also includes a limit ring 400, which is threadedly connected to the extrusion screw 320, and the limit ring 400 is axially slidably arranged in the axial hole 211 and is circumferentially limited with the main drive shaft 210. Among them, the sliding distance of the limit ring 400 between the limit surface 2112 and the transmission seat 310 is configured to be the capacity of a reagent bottle.

[0094] Specifically, in the dose adjustment stage, the main driving shaft 210 drives the transmission sleeve 500 to rotate in the opposite direction, and the transmission sleeve 500 drives the scale sleeve 600 to rotate in the circumferential direction. 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 reverse 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, so as to achieve 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.

[0095] During the injection stage, the main drive shaft 210 is in transmission connection with the transmission seat 310, and the main drive shaft 210 drives the transmission seat 310 to rotate forward, and the transmission seat 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 seat 310 driving the extrusion screw 320 to rotate, and the head of the extrusion screw 320 abuts against the tail of the reagent bottle, thereby injecting medicine into the patient, and when the end of the limit sleeve abuts against the transmission seat 310, the injection of the reagent in the reagent bottle is completed.

[0096] 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. Therefore, during the rotation of the main drive shaft 210, the main drive shaft 210 can drive the limit ring 400 to move along the extrusion screw 320 toward the limit surface 2112.

[0097] Further, refer to Fig. 9 and Fig.10 A first positioning tooth portion 2111 is axially extended on the inner circumference of the axial hole 211 , and a plurality of second positioning tooth portions 410 are sequentially and spaced apart on 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 .

[0098] It is understandable that during the assembly process of the syringe, the transmission seat 310 and the stop 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 stop ring 400 with the axial hole 211, and the second transmission part 311 with the first transmission part 2341, so that the stop ring 400 and the transmission seat 310 can be installed at the same time. In the present application, the axial extension of the axial hole 211 is provided with a first positioning tooth part 2111, and the stop ring 400 is provided with a plurality of second positioning tooth parts 410 at intervals on the outer peripheral surface. With such a configuration, the stop ring 400 can slide into the axial hole 211 more easily. The staff only needs to align the first transmission part 2341 with the second transmission part 311, so that the assembly connection between the transmission seat 310 and the connecting seat 234 and the assembly connection between the stop ring 400 and the main drive shaft 210 can be completed conveniently.

[0099] Furthermore, the second clutch teeth 2321 of the clutch 232 and the second positioning tooth portion 410 of the limiting ring 400 are arranged in equal numbers, for example, the second clutch teeth 2321 of the clutch 232 and the second positioning tooth portion 410 of the limiting ring 400 are arranged in 100 or 100. It can be understood that the circumferential teeth of the limiting ring 400 are preferably the numbers corresponding to the equal divisions of the dosage scale, and the angle of each measurement unit is synchronized. When assembling, the raised ratchet or convex key and the recessed ratchet or raised keyway (that is, the first positioning tooth portion 2111 and the second positioning tooth portion 410 mentioned above) are engaged without interference due to inconsistent angles. When the number of mutually matched protruding teeth or grooves is the minimum number of 100, the assembly needs to be aligned. If it is less than 100 equal divisions, the assembly needs to be aligned to the assembly position. Of course, the matching structure greater than 100 equal divisions can also achieve assembly without interference or jamming, although it is more refined. Considering the product size and the degree of refinement that the component material can be processed to, more and more refined equal division structures are not particularly preferred structures.

[0100] In one possible embodiment, referring to Figure 4 , Figure 7 and Figure 8, a fixed sleeve 700 is axially plugged and fixed on 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, wherein 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 is radially protruded outward, and the front ring portion 720 is axially plugged and connected to the inner circumferential surface of the housing 100. A first circumferential limiting portion 741 is provided at the end of the front ring portion 720 to limit the circumferential direction with the second circumferential limiting 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 is radially protruded inwardly. The rear end of the main drive shaft 210 is rotatably inserted into the rear ring portion 730. The rear ring portion 730 is provided with a second hook hole 731. The rear end of the torsion spring 220 is hooked on the second hook 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.

[0101] 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 provided with a first circumferential limiting portion 741 in the circumferential direction. 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.

[0102] It is understandable that the inner side of the housing 100 is axially plugged and fixed with a fixed sleeve 700, which is integrated with 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, so that the main drive shaft 210, the clutch assembly 230, the torsion spring 220 and the transmission sleeve 500 are conveniently assembled on the inner side of the housing 100. In this way, when assembling the syringe, the staff can conveniently complete the assembly of the syringe, thereby ensuring the production efficiency of the syringe.

[0103] 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, and the force storage of the torsion spring 220 is more flexible and easier to operate.

[0104] Further, 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, and the third circumferential limiting portion 122 is plugged and matched with the fourth circumferential limiting portion 721. Thus, when the first circumferential limiting portion 741 is axially plugged and matched with the second circumferential limiting portion 2313, the fixed sleeve 700 and the housing 100 are circumferentially restricted, and the two cannot rotate relative to each other, thereby limiting the rotation of the clutch assembly 230. Moreover, the fixed sleeve 700 and the housing 100 adopt the above-mentioned connection method, and the fixed sleeve 700 can be conveniently assembled on the inner side of 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.

[0105] Furthermore, refer to Figure 8 , a third guide surface is provided at the front end of the third circumferential limit portion 122, and the third guide surface 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, and the fourth guide surface is used to axially guide the third circumferential limit portion 122. Among them, the third guide surface and the fourth guide surface can be guide arc surfaces or guide inclined surfaces. It can be understood that when the fourth circumferential limit portion 721 is plugged and matched with the third circumferential limit portion 122 again, the third guide surface and the fourth guide surface have a circumferential guiding effect on each other, thereby ensuring that the fourth circumferential limit portion 721 can be plugged and matched with the third circumferential limit portion 122 smoothly, so as to facilitate the assembly of the fixing sleeve 700 on the inner side of the housing 100.

[0106] In order to further position the fixing sleeve 700 and the connection seat 234 of the clutch assembly 230, in some embodiments, refer to Figure 5 and Figure 6 , the end of the fixed sleeve 700 is provided with a first convex ring portion 740, and the first circumferential limit portion 741 is arranged on the outer circumference of the first convex ring portion 740; at the same time, the end of the clutch assembly 230 is provided with a second convex ring portion 2312, and the second circumferential limit portion 2313 is arranged on the inner circumference of the second convex ring portion 2312. Among them, the outer circumference of the first convex ring portion 740 is gradually contracted, and the inner circumference of the second convex ring portion 2312 is gradually expanded, so that the outer circumference of the first convex ring portion 740 is adapted to the inner circumference of the second convex ring portion 2312. It can be understood that when the fourth circumferential limit portion 721 is plugged and matched with the third circumferential limit portion 122 again, 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 and matched with the first circumferential limit portion 741.

[0107] In some embodiments, reference Figure 7The syringe further includes a knob 130 and a button 140, wherein the outer ring body of the knob 130 is rotatably sleeved on the rear end of the housing 100, for example, the inner circumference of the outer ring body of the knob 130 is provided with a second rotation protrusion 131, and the outer circumference of the rear end 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 Fig.11 and Fig.12 ), whereby the knob 130 is rotatably connected to the rear end of the housing 100. Also, the inner ring body of the knob 130 and the rear end of the main drive shaft 210 are circumferentially limited. For example, the rear end of the main drive shaft 210 has a strip-shaped protrusion, and the inner circumferential surface of the inner ring body of the knob 130 has a strip-shaped groove, and the strip-shaped protrusion is embedded in the strip-shaped groove, whereby the knob 130 and the rear end of the main drive shaft 210 are circumferentially limited. The compression spring 150 is held between the knob 130 and the button 140, and is used to push the button 140 to reset backward.

[0108] During the application process, the user can rotate the knob 130 in the forward direction to drive the main drive shaft 210 to rotate in the forward direction, thereby adjusting the scale sleeve 600 and storing the force of the torsion spring 220. In addition, the user can press the button 140 forward to push the main drive shaft 210 forward, thereby releasing the restriction of the housing 100 on the clutch assembly 230 (refer to Figure 4 ), therefore, the main driving shaft 210 drives the transmission base 310 to rotate through the clutch assembly 230.

[0109] Further, refer to Figure 7 and Fig.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 an initial state to a locked state; wherein the third elastic arm 123 has a first abutting end 1231 facing in a circumferential direction, and the scale sleeve 600 has a second abutting end 610 facing in a circumferential direction, 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.

[0110] In the dose adjustment stage, the zero scale line of the scale sleeve 600 is at the position of the observation port 121, and the medical staff rotates the main drive shaft 210 in the forward direction, and the main drive shaft 210 drives the scale sleeve 600 to rotate forward synchronously. Since the inner side of the scale sleeve 600 is axially slidably arranged with the main drive shaft 210, and the outer side of the scale sleeve 600 is threadedly connected with the first shell 100, when the main drive shaft 210 drives the scale sleeve 600 to rotate forward, the scale sleeve 600 slides backward along the axial direction of the first shell 100. The observation port 121 is used to observe the dose adjustment. The greater the dose adjustment, the greater the scale value of the scale line corresponding to the observation port 121. When the medical staff observes that the scale value at the observation port 121 reaches the maximum scale value, such as 80U I of the scale sleeve 600, the second abutting end 610 of the scale sleeve 600 abuts against 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 just adjusted to the maximum injection amount. In the drug injection stage, the main drive shaft 210 rotates in the opposite direction, and the main drive shaft 210 drives 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 observe the injection of the drug. When the observation port 121 displays the zero scale line, the syringe has just injected the preset amount of drug.

[0111] Furthermore, a stop protrusion 722 is provided on the side wall of the front end of the fixing sleeve 700, more specifically, on the inner side wall of the front ring portion 720 (see Figure 8 ), the front end of the scale sleeve 600 has a circumferentially oriented abutting end. When the abutting end abuts against the side of the stop protrusion 722, at this time, the observation port 121 displays the zero scale of the scale sleeve 600, indicating that the injection of the medicine is completed.

[0112] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

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, wherein the torsion spring is sleeved on the outside of the main drive shaft and connected to the housing and 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; wherein, a third elastic arm is circumferentially extended at the rear end portion of the shell, a third protrusion is protruded 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 is elastically deformed inward from an 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.

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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