Needleless injection pen capable of adjusting injection dosage

Abstract

The invention provides a needleless injection pen capable of adjusting injection dosage. The needleless injection pen can solve the problems that an existing structure is complex in structure, large in size, inconvenient to use, high in price and the like. The spring barrel is rotatably sleeved with the cylindrical shell, an inner cavity of the cylindrical shell is communicated with an inner cavity of the spring barrel to form a containing cavity extending in the vertical axis direction, an injection barrel of the injector assembly is concentrically and fixedly installed on the cylindrical shell, and the plunger is axially connected with the conveying part. The dosage adjusting piece sequentially penetrates through the spring barrel and the conveying piece from bottom to top and is connected with a plunger of the injector assembly, the conveying piece can linearly move in the containing cavity along with relative rotation of the barrel-shaped shell and the spring shell, and the trigger is arranged at the top of the spring barrel in a horizontal moving mode. When the conveying part is located at the to-be-triggered position, the trigger blocks and limits vertical upward movement of the conveying part, and when the trigger is horizontally concentric with the containing cavity, the conveying part rapidly moves in the containing cavity under the action of the spring to complete injection.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to the field of insulin injection devices, and more particularly to a needle-free injection pen with adjustable injection dose. BACKGROUND

[0002] The injection pens on the market, such as insulin injection pens, mainly adopt the traditional needle injection form, which injects drugs into the human body through a stainless steel needle. In the application process, it is easy to cause local swelling, bleeding and other skin damage, and if the patient is long-term injection, it will also produce subcutaneous nodules and other adverse conditions.

[0003] In order to solve the above problems, the needle-free injection pen appears on the market at present, which uses the high-pressure jet principle to make the liquid drug form a thin liquid stream to penetrate the skin to the subcutaneous tissue instantaneously, so that the drug is distributed in the subcutaneous tissue. It not only has a fast onset time, but also has a high drug absorption rate. The needle-free injection has the advantages of no needle, no pain, no cross infection, high efficiency, safety, etc., and is especially suitable for patients who need long-term self-administration. However, the existing needle-free injection pen, especially the needle-free injection pen which needs to control the injection dose during use, mostly has the problems of complex structure, large volume, inconvenient carrying, complicated use, high price, etc. SUMMARY

[0004] In view of the above problems, the present application provides a needle-free injection pen with adjustable injection dose, which can solve the problems of complex structure, large volume, inconvenient use, high price, etc. of the existing needle-free injection pen.

[0005] The technical scheme is as follows: a needle-free injection pen capable of adjusting injection dose, comprising a syringe assembly and a power source assembly which are concentrically arranged with a vertical axis as a center line, the syringe assembly comprises a syringe barrel and a plunger which moves in the syringe barrel, the power source assembly comprises a spring and a spring barrel for accommodating the spring, characterized in that: the power source assembly further comprises a cylindrical shell, a delivery member and a trigger, the syringe assembly further comprises a dose adjusting member, the upper part of the spring barrel is rotatably installed in the cylindrical shell and makes the inner cavity of the cylindrical shell and the inner cavity of the spring barrel communicate to form an accommodating cavity which extends along the vertical axis direction, the delivery member is arranged in the accommodating cavity and can move linearly along the vertical axis direction with the relative rotation of the cylindrical shell and the spring shell, the dose adjusting member penetrates the spring barrel, the delivery member and the plunger of the syringe assembly in sequence from the bottom along the vertical axis direction and is connected with the plunger, the syringe barrel is concentrically fixed to the top of the cylindrical shell, the plunger penetrates the top of the cylindrical shell, the delivery member and the dose adjusting member in sequence along the vertical axis and is connected with the dose adjusting member concentrically, one end of the spring abuts against the bottom surface of the spring barrel and the other end is connected with the bottom end of the delivery member, the trigger is horizontally movably arranged on the top of the spring barrel, the delivery member has a to-be-triggered position in the accommodating cavity, when the delivery member moves vertically to the to-be-triggered position, the trigger is eccentric to the accommodating cavity and blocks and limits the vertical upward movement of the delivery member, when the trigger moves horizontally to be concentric to the accommodating cavity, the delivery member drives the dose adjusting member to move upward integrally in the accommodating cavity under the rebounding force of the spring and penetrates the trigger, thereby driving the plunger to move upward and completing injection.

[0006] As a preferred solution of the above technical scheme, the delivery member is connected with the spring barrel and the cylindrical shell through a vertical movement driving mechanism, the vertical movement driving mechanism comprises a vertical movement guide structure and a threaded guide structure; the vertical movement guide structure comprises a vertical linear extension protrusion arranged on the inner circumferential surface of the spring sleeve and a vertical guide groove arranged on the outer circumferential surface of the delivery member, the delivery member is sleeved in the spring barrel and the protrusion is movably assembled in the vertical guide groove; the threaded guide structure comprises a helical guide surface arranged in the cylindrical shell and a guide column with a helical top surface which can be matched with the helical guide surface.

[0007] As a further preferred solution, the spring barrel is provided with an elastic arm, the elastic arm is provided with a hook portion protruding from the inner circumferential surface of the spring barrel, the outer circumferential surface of the delivery member is provided with a vertical extension groove, and when the delivery member is sleeved in the spring barrel, the hook portion of the elastic arm is always embedded in the groove.

[0008] As a further another preferred solution, a sleeve is provided on the cylindrical shell and penetrates the top of the cylindrical shell along the vertical axis direction, an inner threaded surface is provided on the inner periphery of the top of the sleeve, and an outer threaded surface is provided on the rear end of the syringe barrel of the syringe assembly, the outer threaded surface of the rear end of the syringe barrel is threadedly connected with the inner threaded surface of the top of the sleeve.

[0009] As a further preferred solution, the outer periphery of the part of the sleeve located in the accommodating cavity is provided with the helical guide surface.

[0010] Further, the delivery member includes a sleeve part and a cylindrical part, the sleeve part has a circular inner cavity extending linearly along the vertical axis direction, the open end of the circular inner cavity is upwardly arranged, and the peripheral wall of the circular inner cavity is provided with the guide column with the top surface being a helical surface, the sleeve of the cylindrical shell is sleeved in the circular inner cavity of the sleeve part, and the helical guide surface cooperates with the helical surface of the guide column, the cylindrical part is concentrically arranged at the bottom of the sleeve part, the cylindrical part is provided with a threaded through hole communicating with the circular inner cavity, the tail end of the plunger of the syringe assembly penetrates the top of the cylindrical shell and extends into the circular inner cavity of the delivery member, the dose adjusting member penetrates the spring barrel, the cylindrical part of the delivery member along the vertical axis direction from the bottom, extends into the circular cavity of the delivery member, and is fixedly connected with the plunger of the syringe, and the dose adjusting member is threadedly connected in the threaded through hole of the cylindrical part of the delivery member.

[0011] Further, the vertical guide groove and the recess are provided on the outer periphery of the sleeve part, and one end of the spring is clamped on the outer periphery of the second cylindrical part.

[0012] Further, the dose adjusting member is an elongated hollow shaft with a vertical through hole, the hollow shaft includes a screw rod part at the upper part and a light shaft part at the lower part, the top end of the screw rod part is provided with a connecting plate, the connecting plate is provided with a through hole concentric with and communicating with the shaft hole, the diameter of the through hole is smaller than the diameter of the shaft hole, thereby forming a stepped flange, the rear end of the plunger of the syringe assembly is provided with a pair of clamping legs, the plunger of the syringe assembly can pass through the through hole, and the pair of clamping legs can be clamped and positioned with the stepped flange.

[0013] Further, the trigger is in a ring structure, which includes a ring body, the bottom surface of the ring body is provided with three supporting ends, the three supporting ends include two supporting rings and a supporting leg, the supporting leg is located at the circumferential intermediate position between the two supporting rings, when the delivery member is in the position to be triggered, that is, the trigger is eccentric to the accommodating cavity, the supporting leg of the trigger abuts against the top surface of the delivery member, and the two supporting rings abut against the top surface of the spring barrel, when the delivery member is concentric to the accommodating cavity, the three supporting ends of the trigger all abut against the top surface of the spring barrel.

[0014] Further, the bottom of the trigger is provided with a stop ring between the support leg and the two support rings, and the top surface of the sleeve part of the delivery member is provided with a notch, when the delivery member is in the position to be triggered, that is, the trigger is eccentric to the accommodating cavity, the support leg of the trigger abuts in the notch, and the stop ring partially abuts with the top surface of the sleeve part.

[0015] Further, the top surface of the spring barrel body is configured with a pair of vertically axisymmetric protrusions, the protrusions include a radially inner arc surface and a slope surface which are smoothly connected, and the support leg of the trigger has an outer peripheral surface, the outer peripheral surface of the support leg is connected with the two stop rings through a vertical stop surface and a pushing slope surface respectively, and the arc surface of the protrusion can be in contact with the pushing slope surface of the support leg.

[0016] Further, the trigger is provided with a trigger part, and the cylindrical shell is provided with a through hole which is in communication with the inner cavity of the cylindrical shell, and the trigger part can penetrate the through hole and protrude out of the outer surface of the cylindrical shell.

[0017] Further, the trigger part includes a trigger button and a clamping structure configured on the annular body of the trigger, the trigger button is clamped in the clamping structure, and the trigger button can penetrate the through hole and protrude out of the outer surface of the cylindrical shell.

[0018] Further, the top of the inner cavity of the cylindrical shell is circumferentially distributed with a limiting baffle, and the top surface of the annular body of the trigger is always limited by the limiting baffle.

[0019] Further, the trigger is provided with a locking structure opposite to the clamping structure, the locking structure includes two vertical ribs provided on the top surface of the annular body of the trigger, and a limiting groove is formed between the two ribs, when the trigger is horizontally moved from the position to be triggered to be concentric with the accommodating cavity, one of the limiting baffle can extend into the limiting groove.

[0020] Further, the outer peripheral upper part of the spring barrel body is provided with an annular flange, and the inner peripheral surface of the cylindrical shell is provided with an annular limiting groove, the spring barrel body is rotatably installed in the cylindrical shell and the annular flange is fitted in the annular limiting groove.

[0021] Further, the bottom of the spring barrel is provided with a spring seat, the spring seat comprises a ring-shaped seat body and hooks arranged around the seat body, a clamping hole is formed in the peripheral wall of the spring barrel, the spring seat is arranged on the bottom of the spring barrel and the hooks are clamped with the clamping hole, one end of the spring is in abutment with the seat body of the spring seat and the other end is connected with the bottom end of the delivery member, the dose adjusting member penetrates through the spring seat and has an operating end protruding from the bottom surface of the spring barrel, and a knob is arranged on the operating end.

[0022] Further, the bottom shell is sleeved on the lower periphery of the spring barrel, a vertical clamping strip is arranged on the peripheral wall of the spring barrel, a clamping groove is arranged on the inner peripheral wall of the bottom shell, the clamping strip can be clamped into the clamping groove, and the spring barrel can rotate synchronously with the bottom shell when the bottom shell is rotated.

[0023] Further, the cylindrical shell is provided with a dust cover for protecting the syringe assembly.

[0024] The present application has the advantages that the spring barrel is rotatably connected with the cylindrical shell, the injection barrel of the syringe assembly is connected to the cylindrical shell, the plunger is connected with the delivery member, the delivery member is arranged to move linearly along the vertical axis direction in the accommodating cavity to realize insulin injection when the cylindrical shell and the spring shell are relatively rotated, the linear movement of the delivery member is controlled by controlling the horizontal position of the trigger to control whether the delivery member moves linearly to inject, and the plunger of the syringe assembly is connected with the delivery member after the dose adjusting member penetrates through the spring barrel and the delivery member from the bottom along the vertical axis direction, so that the plunger of the syringe assembly is driven to move by the dose adjusting member to realize injection dose adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a front view of the present application of a needle-free injection pen with adjustable injection dose;

[0026] Figure 2 It is an exploded view of the present application of a needle-free injection pen with adjustable injection dose;

[0027] Figure 3 It is a sectional view of the present application of a needle-free injection pen with adjustable injection dose when the delivery member is in a waiting trigger position along Figure 1 A-A direction;

[0028] Figure 4 It is a top view of the present application when the delivery member is in a waiting trigger position (the cylindrical shell is not shown);

[0029] Figure 5This is a three-dimensional schematic diagram of the present invention when the conveyor is in the triggering position (the cylindrical housing is not shown);

[0030] Figure 6 The needle-free injection pen of the present invention, with adjustable injection dosage, operates in a state where the delivery component is concentric with the receiving cavity (i.e., after triggering and injection). Figure 1 Schematic diagram of the AA section;

[0031] Figure 7 This is a top view of the needle-free injection pen with adjustable injection dosage of the present invention, with the delivery component concentric with the receiving cavity (i.e., after triggering and injection). (The cylindrical shell is not shown.)

[0032] Figure 8 This is a three-dimensional schematic diagram of the needle-free injection pen with adjustable injection dosage of the present invention in the state where the delivery component is concentric with the receiving cavity (i.e., after triggering and injection). (The cylindrical shell is not shown.)

[0033] Figure 9 This is a three-dimensional structural diagram of the cylindrical shell in the present invention from a first view.

[0034] Figure 10 This is a schematic diagram of the main view structure of the cylindrical shell in this invention;

[0035] Figure 11 for Figure 10 Schematic diagram of the BB-direction cross-section structure;

[0036] Figure 12 This is a three-dimensional structural diagram of the conveying component in the first view of the present invention;

[0037] Figure 13 This is a three-dimensional structural diagram of the conveying component in the second view of the present invention;

[0038] Figure 14 This is a top view of the conveying component in this invention.

[0039] Figure 15 for Figure 14 Schematic diagram of the CC-direction cross-section structure;

[0040] Figure 16 This is a three-dimensional structural diagram of the spring cylinder in this invention;

[0041] Figure 17 This is a top view of the spring cylinder structure in this invention;

[0042] Figure 18 This is a three-dimensional structural diagram of the first view of the trigger in this invention;

[0043] Figure 19The schematic view of the perspective structure of the second view direction of the trigger in the application;

[0044] Figure 20 The schematic view of the perspective structure of the main view direction of the dose adjusting member in the application;

[0045] Figure 21 The schematic view of the perspective structure of the second view direction of the trigger in the application; Figure 20 The schematic view of the perspective structure of the second view direction of the trigger in the application;

[0046] Figure 22 The schematic view of the perspective structure of the spring seat in the application;

[0047] Figure 23 The schematic view of the perspective structure of the trigger button in the application.

[0048] Reference signs:

[0049] 100 - needleless injection pen;

[0050] 10 - injector assembly, 11 - injection barrel, 12 - plunger, 121 - clamping leg, 13 - dose adjusting member, 131 - vertical through shaft hole, 132 - screw part, 133 - optical axis part, 134 - connecting plate, 135 - through hole, 136 - stepped flange, 137 - operation end, 138 - knob;

[0051] 20 - spring;

[0052] 30 - spring barrel, 31 - convex strip, 32 - elastic arm, 33 - hook part, 34a - protrusion, 34b - protrusion, 35 - spring seat, 351 - seat body, 352 - clamping hook, 36 - clamping hole, 37 - clamping strip, 38 - annular flange;

[0053] 40 - cylindrical shell, 41 - helical guide surface, 42 - sleeve, 42a - internal thread surface, 43 - through hole, 45 - annular limiting groove;

[0054] 50 - delivery member, 51 - vertical guide groove, 52 - helical surface, 53 - guide column, 54 - groove, 55 - sleeve part, 551 - circular inner cavity, 56 - cylindrical part, 57 - threaded through hole, 58 - notch;

[0055] 60 - trigger, 61 - annular body, 62a - support ring, 62b - support ring, 62c - support leg, 62c1 - vertical stop surface, 62c2 - push-in inclined surface, 63 - stop ring, 64 - trigger button, 65 - clamping hole, 66 - clamping leg, 67 - pin, 68 - rib, 69 - limiting groove;

[0056] 70 - bottom shell, 71 - clamping groove, 72 - stand column;

[0057] 80 - dust cover. DETAILED DESCRIPTION

[0058] See Figures 1 to 3 The present application is a needle-free injection pen 100 with adjustable injection dose, which comprises an injector assembly 10 and a power source assembly, the injector assembly 10 and the power source assembly are coaxially arranged along a vertical axis I, the injector assembly 10 comprises an injection barrel 11 and a plunger 12 moving in the injection barrel 11, the power source assembly comprises a spring 20, a spring barrel 30 for accommodating the spring 20, a cylindrical shell 40, a delivery member 50 and a trigger 60, the injector assembly 10 further comprises a dose adjustment member 13, the upper part of the spring barrel 30 is rotatably mounted in the cylindrical shell 40 and makes the inner cavity of the cylindrical shell 40 and the inner cavity of the spring barrel 30 communicate to form an accommodation cavity extending along the vertical axis direction, the injection barrel 11 is coaxially fixed to the top of the cylindrical shell 40, the plunger 12 penetrates the top of the cylindrical shell 40 along the vertical axis and extends into the accommodation cavity to be axially connected with the delivery member 50, the delivery member 50 can move linearly along the vertical axis direction in the accommodation cavity with the relative rotation of the cylindrical shell 40 and the spring barrel 30, the dose adjustment member 13 penetrates the spring barrel 30, the delivery member 50 and the plunger 12 of the injector assembly 10 along the vertical axis direction from the bottom in sequence, one end of the spring 20 abuts against the bottom surface of the spring barrel 30 and the other end is connected with the bottom end of the delivery member 50, the trigger 60 is horizontally movably arranged on the top of the spring barrel 30, the delivery member 50 has a waiting-to-trigger position in the accommodation cavity, when the delivery member 50 moves vertically to the waiting-to-trigger position, the trigger 60 is eccentric to the accommodation cavity and blocks the vertical upward movement of the delivery member 50 (see Figures 3 to 5 ), when the trigger 60 moves horizontally to be concentric to the accommodation cavity (see Figures 6 to 8 ), the delivery member 50 quickly moves upward in the accommodation cavity under the rebounding force of the spring 20 and penetrates the trigger 60, thereby driving the plunger 12 to move upward to complete the injection.

[0059] As a preferred technical scheme of the needle-free injection pen of the present application, the delivery member 50 is connected with the spring barrel 30 and the cylindrical shell 40 through vertical movement driving mechanisms respectively, see Figures 9 to 17The vertical movement drive mechanism includes a vertical movement guide structure between the conveyor 50 and the spring cylinder 30, and a threaded guide structure between the conveyor 50 and the cylindrical shell 40. The vertical movement guide structure includes a protrusion 31 extending vertically in a straight line on the inner circumferential surface of the spring cylinder 30 and a vertical guide groove 51 on the outer circumferential surface of the conveyor 50. The conveyor 50 is sleeved inside the spring cylinder 30, and the protrusion 31 is movably assembled in the vertical guide groove 51. The threaded guide structure includes a helical guide surface 41 inside the cylindrical shell 40 and a helical guide surface 41 inside the conveyor 50, the top surface of which is capable of interacting with the helical guide surface. The guide post 53 is matched with the spiral surface 52 of the guide surface 41; in this embodiment, there are two sets of spiral guide surfaces 41 and guide posts 53, and they are arranged symmetrically at the center; since the conveying component 50 is connected to the spring cylinder 30 through the above-mentioned vertical movement guide structure, and the conveying component 50 is connected to the cylindrical shell 40 through the threaded guide structure, when the cylindrical shell 40 and the spring cylinder 30 rotate relative to each other, the conveying component 40 can move up or down along the vertical axis I under the spiral guidance of the threaded guide structure and the vertical movement guide of the vertical movement guide structure.

[0060] As a further preferred embodiment, the spring cylinder 30 is provided with an elastic arm 32, see Figures 16 to 17 The elastic arm 32 is provided with a hook 33 protruding from the inner circumferential surface of the spring cylinder 30, and the outer circumferential surface of the conveying member 50 is provided with a groove 54 extending vertically. When the conveying member 50 is sleeved in the spring cylinder 30, the hook 33 of the elastic arm 32 can always be embedded in the groove 54 and fit against the groove 54. This arrangement can further ensure the reliability of the conveying member 50's upward or downward movement along the vertical axis I.

[0061] In this embodiment of the invention, an annular flange 38 is provided on the upper part of the outer periphery of the spring cylinder 30, see Figure 11 , 16 An annular limiting groove 45 is provided on the inner circumferential surface of the cylindrical shell 40. The spring cylinder 30 is rotatably installed inside the cylindrical shell 40 and the annular flange 38 is fitted into the annular limiting groove 45, thereby ensuring reliable relative rotation between the spring cylinder 30 and the cylindrical shell 40.

[0062] As a further preferred option, see Figures 9 to 11 The cylindrical shell 40 is provided with a sleeve 42 extending through its top along the vertical axis. The inner circumference of the top of the sleeve 42 is provided with an internal thread surface 42a. The rear end of the syringe body 11 of the syringe assembly 10 is provided with an external thread surface. The external thread surface of the rear end of the syringe body 11 is threadedly connected to the internal thread surface 42a of the top of the sleeve 42. The outer circumferential surface of the part of the sleeve 42 located in the receiving cavity is provided with a helical guide surface 41.

[0063] The delivery member 50 comprises a sleeve part 55 and a cylindrical part 56, the sleeve part 55 has a circular inner cavity 551 extending linearly along the vertical axis I, see Figures 12 to 15 , the open end of the circular inner cavity 551 is upwardly arranged and the peripheral wall of the circular inner cavity 551 is provided with a guide column 53 with a helical surface 52 as the top surface, the sleeve 42 of the cylindrical shell 40 is sleeved in the circular inner cavity 551 of the sleeve part 55 and the helical guide surface 41 cooperates with the helical surface 52 of the guide column 53, the cylindrical part 56 is concentrically arranged at the bottom of the sleeve part 55, the cylindrical part 56 is provided with a threaded through hole 57 communicating with the circular inner cavity 551, the tail end of the plunger 12 of the syringe assembly 10 penetrates the top of the cylindrical shell 40 and extends into the circular inner cavity 551 of the delivery member 50, the dose adjusting member 13 penetrates the spring barrel 20 along the linear direction of the vertical axis C from the bottom, extends into the circular inner cavity 551 of the delivery member 50 and is fixedly connected with the plunger 12 of the syringe assembly 10, and the dose adjusting member 13 is threadedly connected in the threaded through hole 57 of the cylindrical part 56 of the delivery member; when the injection dose needs to be adjusted, only the dose adjusting member 13 needs to be rotated, so that the dose adjusting member 13 can drive the plunger 12 of the syringe assembly 10 to move upward, thereby achieving dose adjustment; the vertical guide groove 51 and the recess 54 are arranged on the outer peripheral surface of the sleeve part 55, and one end of the spring 20 is clamped on the outer peripheral surface of the cylindrical part 56.

[0064] In the injection pen of the present application, the dose adjusting member 13 is an elongated hollow shaft with a vertical through shaft hole 131, see Figure 20 , 21 The hollow shaft comprises a screw part 132 at the upper part and a light shaft part 133 at the lower part, the top end of the screw part 132 is provided with a connecting plate 134, the connecting plate 134 is provided with a through hole 135 concentric with and communicating with the vertical through shaft hole 131, the hole diameter d of the through hole 135 is smaller than the hole diameter D of the vertical through shaft hole 131, thereby forming a stepped flange 136, the rear end of the plunger 12 of the syringe assembly 10 is provided with a pair of clamping legs 121, the plunger 12 of the syringe assembly 10 can pass through the through hole 135 and the pair of clamping legs 121 can be clamped and positioned with the stepped flange 136.

[0065] The trigger 60 is in a ring structure, see Figure 18 and Figure 19The trigger 60 includes a ring-shaped body 61, the bottom surface of the ring-shaped body 61 is configured with three supporting ends, including two supporting rings 62a, 62b and a supporting foot 62c, the supporting foot 62c is located at the circumferential intermediate position of the two supporting rings 62a, 62b, when the conveying piece 50 is in the position to be triggered, that is, the trigger 60 is eccentric to the accommodating cavity, the supporting foot 62c of the trigger 60 abuts against the top surface of the conveying piece 50, and the two supporting rings 62a, 62b abut against the top surface of the spring barrel 30, so that the trigger 60 has a blocking and limiting effect on the conveying piece 50 rising along the vertical axis I in this state; when the conveying piece 50 is in the position concentric to the accommodating cavity, the three supporting ends of the trigger 60 (that is, the two supporting rings 62a, 62b and the supporting foot 62c) all abut against the top surface of the spring barrel 30, see Figures 3 to 8 .

[0066] Further preferred technical solutions, the bottom of the trigger 60 is located between the supporting foot 62c and the two supporting rings 62a, 62b respectively provided with a stop ring 63, the stop ring 63 is extended from the bottom surface of the trigger ring-shaped body 61, the top surface of the sleeve part 55 of the conveying piece 50 is provided with a notch 58, when the conveying piece 50 is in the position to be triggered, that is, the trigger 60 is eccentric to the accommodating cavity, the supporting foot 62c of the trigger 60 abuts in the notch 58, and the stop ring 63 partially abuts against the top surface of the sleeve part 55, so that the supporting foot 62c of the trigger 60 and the stop rings 63 on both sides can simultaneously block and limit the conveying piece 50 to move upward vertically more stably and reliably.

[0067] The top surface of the spring barrel 30 is configured with a pair of vertically axis-symmetric protrusions 34a, 34b, see Figure 14The convex block 34a and 34b each comprises an arc surface 341 and a slope surface 342 which are connected smoothly and located at the inner side in the radial direction, the supporting leg 62c of the trigger 60 has an outer circumferential surface, and the outer circumferential surface of the supporting leg is connected with the two stop rings respectively through a vertical stop surface 62c1 and a pushing inclined surface 62c2; when the delivery member 50 is moved from the position to be triggered which is eccentric to the accommodating cavity to the position which is concentric to the accommodating cavity, the bottom surface of the supporting leg 62c of the trigger 60 abuts against the top surface of the spring barrel 30, and the vertical stop surface 62c1 of the supporting leg 62c abuts against the arc surface 341 of the convex block 34a; when it is needed to reset the delivery member 50 to the position to be triggered, the spring barrel 30 is relatively rotated with respect to the barrel-shaped shell 40, in the process, on one hand, the delivery member 50 is moved downward along the direction of the vertical axis I to the lower side of the trigger 60, and on the other hand, the convex block 34a on the spring barrel 30 is separated from the supporting leg 62c and at the same time, the convex block 34b is rotated to the position where the slope surface 342 of the convex block 34b is in contact with the pushing inclined surface 62c2 of the supporting leg of the trigger 60, with the continuous rotation of the spring barrel 30, since the convex block 34b can only rotate integrally with the spring barrel 30, the slope surface 342 of the convex block 34b can generate a pushing force on the pushing inclined surface 62c2 of the supporting leg of the trigger 60, thus pushing the trigger 60 to translate integrally until the supporting leg 62c of the trigger 60 abuts against the notch 58 of the delivery member 50, the two stop rings 63 partially abut against the top surface of the sleeve part 55 of the delivery member, and the two supporting rings 62a and 62b abut against the top surface of the spring barrel 30, thus realizing the reset of the delivery member 50 to the position to be triggered.

[0068] In the embodiment of the present application, the trigger 60 is further provided with a trigger part, the barrel-shaped shell 40 is provided with a through hole 43 which is communicated with the inner cavity of the barrel-shaped shell 40, and the trigger part can penetrate through the through hole 43 and protrude from the outer surface of the barrel-shaped shell 40; thus, by directly operating the trigger part, the operation of the trigger 60 can be realized, and the operation portability of the present application is improved.

[0069] More specifically, the trigger part in the embodiment comprises a trigger button 64 and a clamping structure which is configured on the annular body 61 of the trigger, the trigger button 64 is clamped in the clamping structure, and the trigger button 64 can penetrate through the through hole 43 and protrude from the outer surface of the barrel-shaped shell 40; wherein the clamping structure comprises a clamping hole 65 which is configured on the annular body 61 and a pair of clamping legs 66 which are located on both sides of the clamping hole 65, the trigger button 64 is provided with a pin 67 which is interference-fitted in the clamping hole 65, and the clamping legs 66 are clamped into the inner side surface of the trigger button 64.

[0070] In order to make the trigger 60 always move only in the horizontal plane which is perpendicular to the vertical axis I and prevent the trigger 60 from moving in the direction of the vertical axis I, the top part of the inner cavity of the barrel-shaped shell 40 is circumferentially distributed with limiting plate strips (the limiting plate strips are hidden by the viewing direction of the view and are not shown in the figure) Figures 9 to 11The top surface of the annular body 61 of the trigger 60 is always limited by the limiting plate strip.

[0071] In the embodiment, the trigger 60 is provided with a locking structure opposite to the clamping hole 65 in the clamping structure, the locking structure includes two vertical limiting plate strips 68 arranged on the top surface of the annular body 61 of the trigger 60, and a limiting groove 69 is formed between the two limiting plate strips 68. When the trigger 60 is horizontally moved from the triggered position to the concentric accommodating cavity, one of the limiting plate strips can extend into the limiting groove 69.

[0072] The bottom of the spring cylinder body 30 in the embodiment is provided with a spring seat 35, as shown in Figure 2 、 Figure 22 The spring seat 35 includes an annular seat body 351 and clamping hooks 352 arranged around the seat body 351, the clamping hole 36 is arranged on the peripheral wall of the spring cylinder body 30, the spring seat 35 is arranged at the bottom of the spring cylinder body 30 and the clamping hooks 352 are clamped and connected with the clamping hole 36, one end of the spring 20 is abutted with the seat body 351 of the spring seat 35 and the other end is connected with the bottom end of the conveying member 50, the bottom of the dose adjusting member 13 penetrates through the spring seat 35 and has an operation end 137 protruding from the bottom surface of the spring cylinder body 30, and the knob 138 is arranged on the operation end 137.

[0073] In the embodiment, the bottom housing 70 is arranged on the lower part of the spring cylinder body 30, the clamping strip 37 is arranged on the peripheral wall of the spring cylinder body 30 in the vertical direction, the clamping groove 71 corresponding to the clamping strip 37 is arranged on the inner peripheral wall of the bottom housing 70, when the bottom housing 70 is sleeved on the lower part of the spring cylinder body 30, the clamping strip 37 is clamped into the clamping groove 71 and the spring cylinder body 30 can rotate synchronously with the bottom housing 70 when the rotating housing rotates; the bottom housing 70 can protect the lower part of the spring cylinder body 30.

[0074] In the embodiment, the dustproof cover 80 is arranged on the cylindrical shell 40 to protect the syringe assembly 10.

[0075] The needle-free injection pen is suitable for fixed metering injection, the metering specification can be set according to the needs of patients, the needle-free injection pen can be used as a disposable injection pen and can be repeatedly used, and therefore the application range is wide.

[0076] The specific embodiments of the present application are described in detail above, but the content is only the preferred embodiment of the present application, and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.

Claims

1. A needle-free injection pen (100) with adjustable injection dosage, comprising a syringe assembly (10) and a power source assembly concentrically arranged around a vertical axis (I), the syringe assembly (10) comprising an injection barrel (11) and a plunger (12) movable within the injection barrel (11), the power source assembly comprising a spring (20) and a spring cylinder (30) for receiving the spring (20), characterized in that: The power source assembly further includes a cylindrical housing (40), a delivery member (50), and a trigger (60). The syringe assembly (10) further includes a dose adjustment member (13). The upper part of the spring cylinder (30) is rotatably fitted inside the cylindrical housing (40), such that the inner cavity of the cylindrical housing (40) communicates with the inner cavity of the spring cylinder (30) to form a receiving cavity extending linearly along the vertical axis (I). The delivery member (50) is disposed in the receiving cavity and can move linearly along the vertical axis (I) as the cylindrical housing (40) and the spring housing (30) rotate relative to each other. The dose adjustment member (13) passes through the spring cylinder (30) and the delivery member (50) sequentially from the bottom along the vertical axis (I) and is connected to the plunger (12) of the syringe assembly (10). The syringe body (11) is concentrically fixed to the top of the cylindrical housing (40), and the plunger (12) extends linearly along the vertical axis (I). The axis passes through the top of the cylindrical shell (40), the delivery member (50), and is concentrically connected to the dose adjustment member (13). One end of the spring (20) abuts against the bottom surface of the spring cylinder (30), and the other end is connected to the bottom end of the delivery member (50). The trigger (60) is horizontally movable and is located at the top of the spring cylinder (30). The delivery member (50) has a trigger position in the receiving cavity. When the delivery member (50) moves vertically to the trigger position, the trigger (60) is eccentric to the receiving cavity and blocks and limits the vertical movement of the delivery member (50). When the trigger (60) moves horizontally to be concentric with the receiving cavity, the delivery member (50) moves rapidly upward in the receiving cavity along with the dose adjustment member (13) under the action of the spring (20) and passes through the trigger (50), thereby driving the plunger (12) to move upward to complete the injection.

2. The needle-free injection pen (100) with adjustable injection dosage according to claim 1, characterized in that: The conveying component (50) is connected to the spring cylinder (30) and the cylindrical shell (40) respectively through a vertical movement drive mechanism. The vertical movement drive mechanism includes a vertical movement guide structure and a threaded guide structure. The vertical movement guide structure includes a protrusion (31) extending vertically on the inner circumferential surface of the spring sleeve (30) and a vertical guide groove (51) on the outer circumferential surface of the conveying component (50). The conveying component (50) is sleeved inside the spring cylinder (30) and the protrusion (31) is movably assembled in the vertical guide groove (51). The threaded guide structure includes a spiral guide surface (41) disposed in the cylindrical shell (40) and a guide post (53) disposed in the conveying component (50) with a spiral surface (52) on its top surface that can cooperate with the spiral guide surface (41).

3. The needle-free injection pen (100) with adjustable injection dosage according to claim 2, characterized in that: The spring cylinder (30) is provided with an elastic arm (32), and the elastic arm (32) is provided with a hook (33) protruding from the inner circumferential surface of the spring cylinder (30). The outer circumferential surface of the conveying member (50) is provided with a groove (54) extending vertically. When the conveying member (50) is sleeved in the spring cylinder (30), the hook (33) of the elastic arm (32) is always embedded in the groove (54).

4. The needle-free injection pen (100) with adjustable injection dosage according to claim 2, characterized in that: The cylindrical shell (40) is provided with a sleeve (42) extending through its top along the vertical axis. The inner circumference of the top of the sleeve (42) is provided with an internal thread surface (42a). The rear end of the syringe body (11) of the syringe assembly (10) has an external thread surface. The external thread surface of the rear end of the syringe body (10) is threadedly connected to the internal thread surface (42a) at the top of the sleeve (42).

5. The needle-free injection pen (100) with adjustable injection dosage according to claim 4, characterized in that: The sleeve (42) has a spiral guide surface (42a) on the outer peripheral surface of the portion located inside the receiving cavity.

6. The needle-free injection pen (100) with adjustable injection dosage according to claim 3, characterized in that: The conveying component (50) includes a sleeve portion (55) and a cylindrical portion (56). The sleeve portion (55) has a circular inner cavity (551) extending linearly along the vertical axis. The open end of the circular inner cavity (551) is arranged facing upwards, and a guide post (53) with a helical surface (52) on its circumferential wall is provided. The sleeve (42) of the cylindrical shell (40) and the portion located within the receiving cavity are fitted into the circular inner cavity (551) of the sleeve portion (55), and the helical guide surface (41) mates with the helical surface (52) of the guide post (53). The cylindrical portion (56) is concentrically constructed on the sleeve portion (55). At the bottom, the cylindrical part (56) has a threaded through hole (57) communicating with the circular inner cavity (551). The tail end of the plunger (12) of the syringe assembly (10) passes through the top of the cylindrical housing (40) and extends into the circular inner cavity (551) of the delivery member (50). The dose adjustment member (13) passes through the spring cylinder (30) and the cylindrical part (56) of the delivery member (50) from the bottom along the vertical axis and extends into the circular cavity (551) of the delivery member (50) and is fixedly connected to the plunger (12) of the syringe. The dose adjustment member (13) is threadedly connected to the threaded through hole (57) of the cylindrical part (56) of the delivery member.

7. The needle-free injection pen (100) with adjustable injection dosage according to claim 6, characterized in that: The vertical guide groove (51) and the groove (54) are both provided on the outer peripheral surface of the sleeve part (55), and one end of the spring (20) is engaged with the outer peripheral surface of the cylindrical part (56).

8. The needle-free injection pen (100) with adjustable injection dosage according to claim 6, characterized in that: The dosage adjustment component (13) is a slender hollow shaft with a vertical through-hole (131). The hollow shaft includes a screw part (132) at the top and an optical shaft part (133) at the bottom. The top end of the screw part (132) is provided with a connecting plate (134). The connecting plate (134) has a through hole (135) that is concentric with and connected to the vertical through-hole (131). The diameter of the through hole (135) is smaller than the diameter of the vertical through-hole (131), thereby forming a stepped flange (136). The rear end of the plunger (12) of the syringe assembly (10) is provided with a pair of locking feet (121). The plunger (12) of the syringe assembly (10) can pass through the through hole (135), and the pair of locking feet (121) can engage and be positioned with the stepped flange (135).

9. The needle-free injection pen (100) with adjustable injection dosage according to claim 6, characterized in that: The trigger (60) has a ring-shaped structure, including a ring-shaped body (61). The bottom surface of the ring-shaped body (61) has three support ends, including two support rings (62a, 62b) and a support foot (62c). The support foot (62c) is located at the circumferential center of the two support rings (62a, 62b). When the conveyor (50) is in the position to be triggered, that is, when the trigger (60) is eccentric to the receiving cavity, the support foot (62c) of the trigger (60) abuts against the top surface of the conveyor (50), and the two support rings (62a, 62b) abut against the top surface of the spring cylinder (30). When the conveyor (50) is concentric with the receiving cavity, the three support ends (62a, 62b, 62c) of the trigger (60) abut against the top surface of the spring cylinder.

10. The needle-free injection pen (100) with adjustable injection dosage according to claim 9, characterized in that: The bottom of the trigger (60) and between the support foot (62c) and the two support rings (62a, 62b) are respectively provided with a stop ring (63). The top surface of the sleeve part (55) of the conveying member (50) is provided with a notch (58). When the conveying member (50) is in the position to be triggered, that is, when the trigger (60) is eccentric to the receiving cavity, the support foot (62c) of the trigger (60) abuts against the notch (58) and the stop ring (63) abuts against the top surface of the sleeve part (55).

11. The needle-free injection pen (100) with adjustable injection dosage according to claim 10, characterized in that: The top surface of the spring cylinder (30) is constructed with a pair of protrusions (34a, 34b) that are symmetrical about the vertical axis. The protrusions (34a, 34b) include an arc-shaped surface (341) and a slope surface (342) that are smoothly connected on the radially inner side. The support foot (62c) of the trigger (60) has an outer peripheral side. The outer peripheral side of the support foot is connected to the stop rings on both sides through a vertical stop surface (62c1) and a pushing slope surface (62c2) respectively. The arc-shaped surface (341) of the protrusions (34a, 34b) can make contact with the pushing slope surface (62c2) of the support foot (62c).

12. A needle-free injection pen (100) with adjustable injection dosage according to any one of claims 9 to 11, characterized in that: The trigger (60) is provided with a trigger part, and the cylindrical housing (40) is provided with a through hole (43) communicating with its inner cavity. The trigger part can pass through the through hole (43) and protrude from the outer surface of the cylindrical housing (40).

13. The needle-free injection pen (100) with adjustable injection dosage according to claim 12, characterized in that: The triggering part includes a trigger button (64) and a locking structure constructed on the annular body (61) of the trigger (60). The trigger button (64) is fitted into the locking structure and can pass through the through hole (43) and protrude from the outer surface of the cylindrical housing (40).

14. The needle-free injection pen (100) with adjustable injection dosage according to claim 9, characterized in that: The top of the inner cavity of the cylindrical shell (40) is circumferentially distributed with limiting strips (44), and the top surface of the annular body (61) of the trigger (60) is always limited by the limiting strips (44).

15. The needle-free injection pen (100) with adjustable injection dosage according to claim 14, characterized in that: The trigger (60) is provided with a locking structure that is directly opposite the engaging structure. The locking structure includes two ribs (68) that are vertically arranged on the top surface of the annular body (61) of the trigger (60). A limiting groove (68) is formed between the two ribs (68). When the trigger (60) moves horizontally from the position to be triggered to be concentric with the receiving cavity, one of the limiting plates (44) can extend into the limiting groove (68).

16. The needle-free injection pen (100) with adjustable injection dosage according to claim 1, characterized in that: The upper outer periphery of the spring cylinder (30) is provided with an annular flange (38), and the inner circumferential surface of the cylindrical shell (40) is provided with an annular limiting groove (45). The spring cylinder (30) is rotatably installed in the cylindrical shell (40), and the annular flange (38) is fitted in the annular limiting groove (45).

17. The needle-free injection pen (100) with adjustable injection dosage according to claim 1, characterized in that: The bottom of the spring cylinder (30) is provided with a spring seat (35). The spring seat (35) includes a ring-shaped seat body (351) and hooks (352) evenly distributed around the seat body (351). The peripheral wall of the spring cylinder (30) is provided with a locking hole (36). The spring seat (35) is located at the bottom of the spring cylinder (30) and the hooks (352) are engaged with the locking hole (36). One end of the spring (20) abuts against the seat body (351) of the spring seat (35) and the other end is connected to the bottom end of the conveying member (50). The bottom of the dose adjustment member (13) passes through the spring seat (30) and has an operating end (137) protruding from the bottom surface of the spring cylinder (30). A knob (138) is installed on the operating end (137).

18. The needle-free injection pen (100) with adjustable injection dosage according to claim 17, characterized in that: It also includes a bottom outer shell (70), which is fitted onto the lower outer periphery of the spring cylinder (30). The outer peripheral wall of the spring cylinder (30) is provided with a vertically extending retaining strip (37), and the inner peripheral wall of the bottom outer shell (70) is provided with a retaining groove. The retaining strip (37) can be engaged in the retaining groove so that the spring cylinder (30) can rotate synchronously with the bottom outer shell (70) when the bottom outer shell (70) is rotated.

19. The needle-free injection pen (100) with adjustable injection dosage according to claim 1, characterized in that: The cylindrical housing (40) is provided with a dust cover (80) for protecting the syringe assembly.

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