CN116942961A

CN116942961A - Injection device

Info

Publication number: CN116942961A
Application number: CN202310919122.XA
Authority: CN
Inventors: 请求不公布姓名; 欧灿生; 舒庆; 陈翠柳
Original assignee: Shenzhen Huimai Intelligent Technology Co ltd
Current assignee: Shenzhen Huimai Intelligent Technology Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2023-10-27

Abstract

The embodiment of the application discloses an injection device, which comprises a shell, a driving mechanism, a torsion spring and a pushing mechanism, wherein a shell shaft is provided with a first positioning part; the driving mechanism is provided with a second positioning part, the first positioning part and the second positioning part are axially and fixedly arranged in the circumferential direction, and the driving mechanism is provided with a third positioning part; the pushing mechanism comprises a transmission seat and a push rod, the transmission seat is rotationally connected with the shell, the transmission seat is provided with a fourth positioning part, the third positioning part and the fourth positioning part are axially and fixedly arranged in the circumferential direction, the push rod is slidably arranged on the transmission seat in a penetrating manner and fixedly arranged in the circumferential direction of the transmission seat, and the push rod is in threaded connection with the shell; the torsion spring is connected with the driving mechanism and the shell. The injection device stops injecting the medicine to the patient midway, and the driving mechanism and the transmission seat are always kept in a synchronous state, so that the medical staff can clearly know the medicine injection condition of the injection device based on the rotation condition of the driving mechanism.

Description

Injection device

Technical Field

The embodiment of the application relates to the technical field of medicine injection, in particular to an injection device.

Background

During the course of treatment, a portion of the drug may be injected into the patient using an injection device, such as semaglutin for diabetes.

In the related art, the injection device includes a housing, a torsion spring, a driving mechanism and a pushing mechanism, wherein the torsion spring, the driving mechanism and the pushing mechanism are disposed at the inner side of the housing. When the medicine is injected, the torsion spring moves through the pushing structure of the driving mechanism, so that the injection device can inject the medicine into a patient. When the injection of the medicine into the patient is needed to be stopped in the middle, the medical staff controls the driving mechanism to be separated from the pushing mechanism, and the pushing mechanism stops acting on the medicine carrier, so that the injection device stops injecting the medicine into the patient.

When the driving mechanism is separated from the pushing mechanism and is in butt joint with the pushing mechanism, the pushing mechanism can be caused to move, so that the injection device can inject medicines into a patient. However, medical staff often determine the condition of the drug injected into the patient by the injection device according to the rotation condition of the driving mechanism, and neither of the above conditions realizes the movement of the pushing mechanism based on the rotation of the driving mechanism, thereby causing the medical staff to be unable to clearly determine the drug injection amount of the injection device.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. The present application provides an injection device capable of specifying the amount of drug to be injected into a patient by the injection device.

The present application proposes an injection device comprising:

the shell is axially provided with a first positioning part in an extending mode;

the driving mechanism is axially provided with a second positioning part in an extending mode, the first positioning part and the second positioning part are axially arranged in a sliding mode and are circumferentially fixedly arranged, and the driving mechanism is axially provided with a third positioning part in an extending mode;

the pushing mechanism comprises a transmission seat and a push rod, the transmission seat is rotationally connected with the shell, a fourth positioning part is axially arranged on the transmission seat in an extending mode, the third positioning part and the fourth positioning part are axially arranged in a sliding mode and are fixedly arranged in the circumferential direction, the push rod is slidably arranged on the transmission seat in a penetrating mode and is fixedly arranged in the circumferential direction of the transmission seat, and the push rod is in threaded connection with the shell;

a torsion spring connected to the drive mechanism and to the housing;

the driving mechanism can be operated to axially slide from a first position to a second position, when the driving mechanism is in the first position, the first positioning part and the second positioning part are in a circumferential fixed state, and the third positioning part and the fourth positioning part are in a circumferential fixed state; when the driving mechanism is at the second position, the first positioning part and the second positioning part are in an axial separation state, the third positioning part and the fourth positioning part are in a circumferential fixed state, and the torsion spring can drive the driving mechanism to circumferentially rotate so as to drive the transmission seat to circumferentially rotate.

According to some embodiments of the application, the drive mechanism comprises:

the main driving shaft is axially and slidably arranged on the shell, and the torsion spring is connected with the main driving shaft and the shell;

and the stop assembly is provided with the second positioning part and the third positioning part, is rotationally connected with the main driving shaft and keeps the torsion spring in a force storage state through the main driving shaft.

According to some embodiments of the application, the stop assembly comprises:

the transmission structure is provided with the second positioning part and the third positioning part, and the main driving shaft is rotationally connected with the transmission structure;

the stop piece is axially and slidably arranged on the transmission structure, a plurality of first tooth parts are arranged on the main driving shaft and one of the stop piece at intervals along the circumferential direction, a second tooth part is arranged on the other one of the stop piece, and the first tooth parts are meshed with the second tooth parts;

and the elastic piece is propped against the transmission structure and the stop piece and is used for enabling the first tooth part to be meshed with the second tooth part.

According to some embodiments of the present application, one of the transmission structure and the stopper is provided with a first elastic arm and a first stopper portion provided on the first elastic arm, and the other one is provided with a first stopper groove at a circumferential interval, and the first stopper portion is clamped in the first stopper groove and can slide along the first stopper groove in an axial direction;

the resistance of the first stop part and the first stop groove in the first circumferential direction is larger than the resistance of the first tooth part and the second tooth part in the first circumferential direction, the resistance of the first stop part and the first stop groove in the second circumferential direction is smaller than the resistance of the first tooth part and the second tooth part in the second circumferential direction, and the directions of the first circumferential direction and the second circumferential direction are opposite.

According to some embodiments of the application, the transmission structure comprises:

the elastic piece is propped between the first transmission piece and the stop piece;

the first transmission piece is connected with the second transmission piece in a clamping mode, the main driving shaft is connected with the second transmission piece in a rotating mode, and the second transmission piece is provided with a third positioning portion.

According to some embodiments of the application, the main driving shaft is provided with a limiting hole along the central shaft, the limiting hole penetrates to one end of the main driving shaft, which is close to the transmission seat, and the limiting hole is provided with a limiting surface facing the transmission seat;

the injection device further comprises a limiting sleeve, wherein the limiting sleeve is slidably arranged in the limiting hole and circumferentially fixed with the main driving shaft, and the limiting sleeve is in threaded connection with the push rod.

According to some embodiments of the application, the driving mechanism further comprises a fixing seat, the fixing seat is connected with the shell, the transmission seat is rotationally connected with the fixing seat, and the push rod is in threaded connection with the fixing seat.

According to some embodiments of the application, one of the fixing base and the transmission base is provided with a second elastic arm and a second stop part arranged on the second elastic arm, and the other one is provided with a second stop groove at intervals in the circumferential direction, and the second stop part is clamped in the second stop groove.

According to some embodiments of the application, the fixing seat comprises an outer ring part, a connecting part and an inner ring part, wherein the connecting part is connected between the outer side of the inner ring part and the inner side of the outer ring part, and the transmission seat is rotationally sleeved on the inner ring part; the second stop grooves are formed in the inner side of the outer ring part at intervals in the circumferential direction, and the transmission seat is provided with second elastic arms and second stop parts arranged on the second elastic arms.

According to some embodiments of the application, the injection device further comprises a scale drum and a transmission drum, wherein;

the scale drum is arranged on the inner side of the shell and is coaxially arranged with the shell, and the outer peripheral surface of the scale drum is in threaded connection with the inner peripheral surface of the shell; wherein the shell is provided with an observation port for observing the scale marks of the scale drum;

the transmission cylinder is at least partially sleeved on the outer side of the driving mechanism and is fixedly arranged along the circumferential direction of the driving mechanism, and the scale cylinder is sleeved on the outer side of the transmission cylinder in a sliding manner and is fixedly arranged along the circumferential direction of the transmission cylinder.

From the above technical solutions, the embodiment of the present application has the following advantages: the driving mechanism is in the first position and the second position, and the third positioning part of the driving mechanism and the fourth positioning part of the transmission seat are always kept in a circumferential fixed state, namely, the driving mechanism and the transmission seat are always kept in a synchronous state. Even if the injection device stops injecting the medicine into the patient midway, since the driving mechanism and the transmission seat are always kept in a synchronous state, the medical staff can clearly know the medicine injection condition of the injection device based on the rotation condition of the driving mechanism so as to avoid excessive injection of the medicine into the patient.

Drawings

The application is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of an injection device according to an embodiment of the present application;

FIG. 2 is an axial cross-sectional view of an injection device and an exploded view thereof according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a driving mechanism and a schematic explosion structure of a pushing mechanism according to an embodiment of the present application;

FIG. 4 is a schematic diagram of an exploded structure of a driving mechanism according to an embodiment of the present application;

fig. 5 is an exploded view of a stop assembly according to an embodiment of the present application.

Reference numerals:

100. a housing; 110. a head shell; 120. a tail shell; 121. an inner cylinder; 122. a first positioning portion; 123. an observation port; 130. a knob; 140. a button; 200. a driving mechanism; 210. a main drive shaft; 211. an annular protrusion; 2111. an annular groove; 212. a first tooth portion; 213. a limiting hole; 2131. a limiting surface; 220. a stop assembly; 221. a stopper; 2211. a second tooth portion; 2212. a first elastic arm; 2213. a first stopper; 222. an elastic member; 223. a first transmission member; 2231. a second positioning portion; 2232. a first stop groove; 224. a second transmission member; 2241. a third positioning portion; 2242. an annular convex edge; 230. a limit sleeve; 300. a torsion spring; 400. a pushing mechanism; 410. a transmission seat; 411. a fourth positioning portion; 412. a second elastic arm; 413. a second stopper; 420. a push rod; 430. a fixing seat; 431. an inner ring portion; 432. an outer ring portion; 4321. a second stop groove; 433. a connection part; 500. a scale drum; 600. a transmission cylinder; 700. an injection needle; 800. a pharmaceutical carrier.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the present application, the meaning of a number is one or more, the meaning of a number is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and the meaning of a number is understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the description of the present application, the descriptions of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The application discloses an injection device, referring to fig. 1 to 3, comprising a housing 100, a driving mechanism 200, a torsion spring 300 and a pushing mechanism 400, wherein:

the housing 100, the inner side of the housing 100 is provided with a first positioning portion 122, and the first positioning portion 122 extends along the axial direction of the housing 100, where the first positioning portion 122 may be a strip-shaped protrusion provided on the housing 100 or a strip-shaped groove provided on the housing 100.

The driving mechanism 200, the driving mechanism 200 is disposed inside the housing 100 along the axial direction of the housing 100, the driving mechanism 200 is provided with a second positioning portion 2231, and the second positioning portion 2231 is also disposed to extend along the axial direction of the housing 100, where the second positioning portion 2231 may be a bar-shaped protrusion disposed at the rear side of the driving mechanism 200 or a bar-shaped groove disposed at the side wall of the driving mechanism 200. The first positioning portion 122 and the second positioning portion 2231 are in fit, that is, the first positioning portion 122 and the second positioning portion 2231 are fixedly disposed along the circumferential direction and slidably disposed along the axial direction. When the second positioning portion 2231 axially slides away from the first positioning portion 122, the first positioning portion 122 releases the circumferential restriction on the second positioning portion 2231, and the drive mechanism 200 can rotate circumferentially within the housing 100.

And, the driving mechanism 200 is further provided with a third positioning portion 2241, the third positioning portion 2241 is also extended along the axial direction of the housing 100, and the third positioning portion 2241 may be a bar-shaped protrusion provided at the front end portion of the driving mechanism 200 or a bar-shaped groove provided at the side wall of the driving mechanism 200.

The torsion spring 300, the torsion spring 300 is sleeved outside the driving mechanism 200, the front end of the torsion spring 300 is connected with the front end of the driving mechanism 200, and the rear end of the torsion spring 300 is connected with the rear end of the housing 100. When the first positioning portion 122 releases the circumferential restriction on the second positioning portion 2231, the torsion force of the torsion spring 300 can rotate the driving mechanism 200 circumferentially.

The pushing device 400, the pushing device 400 includes a transmission seat 410 and a pushing rod 420, wherein the transmission seat 410 is coaxially disposed on the inner side of the housing 100 and is rotatably connected with the housing 100. The transmission seat 410 is provided with a fourth positioning portion 411, and the fourth positioning portion 411 may be a bar-shaped protrusion disposed at a rear end portion of the transmission seat 410, or may be a bar-shaped groove disposed on a side wall of the transmission portion, and the third positioning portion 2241 is disposed in an embedded and matched manner with the fourth positioning portion 411, that is, the third positioning portion 2241 and the fourth positioning portion 411 are fixedly disposed in a circumferential direction and slidably disposed in an axial direction. The push rod 420 axially slides through the central hole of the transmission seat 410 and is fixed with the circumference of the transmission seat 410, so that the transmission seat 410 can drive the push rod 420 to synchronously rotate. For example, the inner sidewall of the transmission seat 410 is axially extended and provided with a bar-shaped protrusion, the sidewall of the push rod 420 is axially extended and provided with a bar-shaped groove, and the bar-shaped protrusion is slidably embedded in the bar-shaped groove, so that the push rod 420 and the transmission seat 410 are circumferentially fixed. And, the push rod 420 is screw-coupled with the housing 100.

Wherein the drive mechanism 200 is operable to slide axially from a first position to a second position, such as pressing the drive mechanism 200 axially forward, the drive mechanism 200 sliding from the first position to the second position. Wherein, when the driving mechanism 200 is at the first position, the first positioning portion 122 and the second positioning portion 2231 are in a circumferentially fixed state, and the third positioning portion 2241 and the fourth positioning portion 411 are in a circumferentially fixed state; when the driving mechanism 200 is at the second position, the first positioning portion 122 and the second positioning portion 2231 are axially separated, and the third positioning portion 2241 and the fourth positioning portion 411 are circumferentially fixed, at this time, the torsion spring 300 can drive the driving mechanism 200 to rotate, so as to drive the transmission seat 410 to circumferentially rotate.

Specifically, at the initial stage, the driving mechanism 200 is in the first position, the second positioning portion 2231 of the driving mechanism 200 and the first positioning portion 122 of the housing 100 are in a circumferentially fixed state, at this time, the housing 100 is in a circumferentially limited state for the driving mechanism 200, the torsion spring 300 can be kept in a torsion state, that is, in a force storage state, and the third positioning portion 2241 and the fourth positioning portion 411 are also in a circumferentially fixed state. When the healthcare worker presses the drive mechanism 200 axially forward, the drive mechanism 200 moves axially forward from the first position to the second position, and the drive mechanism 200 enters the drive phase. In the driving stage of the driving mechanism 200, the second positioning portion 2231 just slides away from the first positioning portion 122 in the axial direction, at this time, the housing 100 releases the circumferential restriction on the driving mechanism 200, and the torsion spring 300 drives the driving mechanism 200 to rotate circumferentially, so that the third positioning portion 2241 of the driving mechanism 200 rotates circumferentially. Since the third positioning portion 2241 and the fourth positioning portion 411 remain in the circumferentially fixed state, the driving mechanism 200 circumferentially drives the third positioning portion 2241 of the transmission seat 410 through the third positioning portion 2241, the transmission seat 410 and the driving mechanism 200 rotate synchronously and circumferentially, and the transmission seat 410 drives the push rod 420 to rotate synchronously and circumferentially. Because the push rod 420 is in threaded connection with the housing 100, the transmission seat 410 moves forward axially during the process of driving the push rod 420 to rotate, thereby acting on the tail of the drug carrier 800 inside the housing 100 and further realizing drug injection into the patient. When it is necessary to stop the injection of the medicine halfway, the medical staff stops pressing the driving mechanism 200 forward, the driving mechanism 200 moves backward under the action of the torsion spring 300, the second positioning portion 2231 of the driving mechanism 200 slides to the first positioning portion 122 of the first housing 100, the housing 100 resumes the circumferential restriction of the driving mechanism 200, the torsion spring 300 stops driving the driving mechanism 200 to rotate circumferentially, and thus the driving push rod 420 stops moving axially forward, and the injection device stops injecting the medicine to the patient.

In the prior art, it is often used to separate the driving mechanism 200 from the pushing mechanism 400, so that the pushing mechanism 400 stops acting on the tail of the drug carrier 800, thereby stopping the continuous injection of the drug into the patient. Wherein, when the driving mechanism 200 is separated from the pushing mechanism 400, the pushing mechanism 400 may still act on the drug carrier 800 due to inertia of the pushing mechanism 400. Further, when the driving mechanism 200 is re-docked with the pushing mechanism 400, the pushing mechanism 400 may be caused to rotate slightly, and the injection device injects the drug into the patient. The above two cases are not based on the rotational driving of the pushing mechanism 400 by the driving mechanism 200, so that the medical staff cannot know the injection amount of the medicine more clearly.

In the present application, the third positioning portion 2241 of the driving mechanism 200 and the fourth positioning portion 411 of the transmission seat 410 are always kept in a circumferentially fixed state, that is, the driving mechanism 200 and the transmission seat 410 are always kept in a synchronized state, in the first position and the second position of the driving mechanism 200. Even if the injection device stops injecting the medicine into the patient halfway, since the driving mechanism 200 and the transmission seat 410 are always kept in a synchronized state, the medical staff can clearly understand the medicine injection condition of the injection device based on the rotation condition of the driving mechanism 200, so as to avoid excessive injection of the medicine into the patient.

If the healthcare worker wants to complete a subsequent drug injection based on the last drug injection, he can continue to press the driving mechanism 200 forward and the injection device continues to inject drug into the patient based on the last drug injection. Therefore, the injection device adopting the structural form can accurately complete the subsequent medicine injection based on the last medicine injection condition.

In some embodiments, referring to fig. 2, 4 and 5, the driving mechanism 200 includes a main driving shaft 210 and a stop assembly 220, wherein the main driving shaft 210 is axially slidably disposed inside the housing 100, the torsion spring 300 is sleeved outside the main driving shaft 210, a front end of the torsion spring 300 is connected to a front end of the main driving shaft 210, and a rear end of the torsion spring 300 is connected to a rear end of the housing 100. The stop assembly 220 is provided with a second positioning portion 2231 and a third positioning portion 2241, when the driving mechanism 200 is in the first position, the stop assembly 220 is in a circumferentially fixed state with the housing 100 by the second positioning portion 2231, and is in a circumferentially fixed state with the transmission seat 410 by the third positioning portion 2241, and the main driving shaft 210 is rotationally connected with the stop assembly 220. Wherein, when the power accumulation of the torsion spring 300 is completed by rotating the main driving shaft 210, the stopper assembly 220 maintains the torsion spring 300 in a torsion state by restricting the rotation of the main driving shaft 210.

Specifically, the healthcare worker presses the main driving shaft 210 forward axially, the main driving shaft 210 is rotationally connected with the stop assembly 220, and the main driving shaft 210 drives the stop assembly 220 to synchronously move forward, so as to drive the second positioning portion 2231 of the stop assembly 220 to axially slide away from the first positioning portion 122 of the housing 100, and at this time, the housing 100 releases the circumferential restriction of the stop assembly 220. Since the stopping assembly 220 has the function of limiting the rotation of the main driving shaft 210, when the stopping assembly 220 is released from the limitation, the torsion spring 300 can drive the stopping assembly 220 to rotate through the main driving shaft 210, so that the third positioning portion 2241 of the stopping assembly 220 rotates to drive the transmission seat 410 to rotate.

It can be appreciated that, by providing the stopper assembly 220, when the first positioning portion 122 and the second positioning portion 2231 are in the circumferentially fixed state, the stopper assembly 220 can be used to restrict the rotation of the main driving shaft 210, thereby maintaining the torsion spring 300 in the power storage state; when the first positioning portion 122 and the second positioning portion 2231 are axially separated, the main drive shaft 210 can rotate the stopper assembly 220, so that the third positioning portion 2241 rotates synchronously. And, the main driving shaft 210 is rotationally connected with the stop assembly 220, when the main driving shaft 210 moves forward in the axial direction, the main driving shaft 210 can drive the stop assembly 220 to move forward, and during the power accumulation process of the torsion spring 300, the main driving shaft 210 can not drive the stop assembly 220 to rotate, so as to avoid driving the transmission seat 410 to rotate.

The driving mechanism 200 includes the above-described structure, but is not limited to the above-described structure, for example, the torsion force of the torsion spring 300 is disposable, and the torsion force of the torsion spring 300 is not required to be adjusted. Of course, the healthcare worker may manually maintain the rotational position of the driving mechanism 200 to ensure that the torsion spring 300 is in a twisted state.

Further, the stop assembly 220 includes a transmission structure, an elastic member 222 and a stop member 221 coaxially disposed, wherein the transmission structure is disposed on the inner side of the housing 100 and is located on the outer side of the main driving shaft 210, and the main driving shaft 210, the transmission structure and the housing 100 are coaxially disposed. The transmission structure is provided with a third positioning portion 2241 and a fourth positioning portion 411, and the transmission structure can be in a circumferentially fixed state with the housing 100 and a circumferentially fixed state with the transmission seat 410. The stop assembly 220 is disposed on the inner side of the housing 100 and is disposed on the outer side of the main driving shaft 210, wherein an annular protrusion 211 is disposed on a side portion of a front end portion of the main driving shaft 210, an annular groove 2111 is disposed on an outer circumferential surface of the annular protrusion 211, an annular flange 2242 is disposed on the inner side of the transmission structure, and the annular flange 2242 is rotationally embedded in the annular groove 2111, so that the main driving shaft 210 is rotationally connected with the transmission structure. Meanwhile, the rear end of the annular protrusion 211 is provided with a plurality of first teeth 212 spaced around the center axis thereof, the end of the stopper 221 adjacent to the annular protrusion 211 is provided with a plurality of second teeth 2211 spaced around the center axis thereof, the first teeth 212 are engaged with the second teeth 2211, and the stopper 221 is axially slidably disposed with the transmission structure. The elastic member 222 is sleeved on the main driving shaft 210, the front end portion of the elastic member 222 abuts against the stop member 221, and the rear end portion abuts against the transmission structure, at this time, the elastic member 222 pushes the stop member 221 axially forward, so that the first tooth portion 212 and the second tooth portion 2211 are kept engaged.

Specifically, during the power storage of the torsion spring 300, the health care provider rotates the main drive shaft 210 in the forward direction, the first tooth portion 212 of the main drive shaft 210 rotates in the forward direction, and the tooth slope of the first tooth portion 212 pushes the second tooth portion 2211 to move axially rearward, so as to avoid the stopper 221 interfering with the forward rotation of the main drive shaft 210. When the power storage of the torsion spring 300 is completed, the main driving shaft 210 loses the external rotational force, the stopper 221 is engaged with the first tooth portion 212 by the second tooth portion 2211 of the stopper 221 under the action of the elastic member 222, and at this time, the stopper 221 interferes with the reverse rotation of the main driving shaft 210, thereby maintaining the main driving shaft 210 at the rotated position and thus maintaining the torsion spring 300 in a torsion state.

In summary, with the stop assembly 220 of the above-mentioned structure, when the main driving shaft 210 rotates at any position, if the first teeth 212 are densely arranged in the circumferential direction, the first teeth 212 of the main driving shaft 210 can engage with the second teeth 2211 of the stop member 221, so that the main driving shaft 210 is kept at the rotated position, and the stop assembly 220 is more flexible to use. Of course, the stopper assembly 220 includes the above-described structure, but is not limited to the above-described structure, for example, the main driving shaft 210 is provided with a plurality of catching pieces for positioning the rotated main driving shaft 210.

Further, the stopper 221 is disposed inside a portion of the transmission structure and coaxially disposed, a side portion of the stopper 221 is circumferentially provided with a first elastic arm 2212, and an end portion of the first elastic arm 2212 is provided with a first stopper 2213; meanwhile, the inner side of the transmission structure is sequentially provided with first stop grooves 2232 at intervals around the central shaft, the first stop grooves 2232 are extended in the axial direction, and the first stop parts 2213 are embedded in the inner side of the first stop grooves 2232 and can axially slide along the first stop grooves 2232. The resistance of the first stop portion 2213 and the first stop groove 2232 in the first circumferential direction is greater than the resistance of the first tooth portion 212 and the second tooth portion 2211 in the first circumferential direction, and the resistance of the first stop portion 2213 and the first stop groove 2232 in the second circumferential direction is smaller than the resistance of the first tooth portion 212 and the second tooth portion 2211 in the second circumferential direction, wherein the first circumferential direction and the second circumferential direction are opposite, and the second circumferential direction is the torsion direction of the torsion spring 300, for example, the first direction is the forward direction and the second direction is the reverse direction.

Specifically, the main drive shaft 210 performs a forward rotational motion against the circumferential elastic force of the torsion spring 300 and the circumferential resistance of the second tooth portion 2211 to the first tooth portion 212. Since the resistance of the first stop portion 2213 and the first stop groove 2232 in the forward direction is greater than the resistance of the first tooth portion 212 and the second tooth portion 2211 in the forward direction, the resistance of the transmission structure to the stop member 221 in the forward direction is greater during the forward rotation of the main driving shaft 210, and the stop member 221 axially slides and does not rotate in the forward direction with the main driving shaft 210, i.e., the first stop portion 2213 axially slides along the first stop groove 2232. When the rotation of the main driving shaft 210 is completed, the main driving shaft 210 stops rotating, the stopper 221 is engaged with the first tooth portion 212 by the elastic member 222, the main driving shaft 210 is maintained at the rotated position, and the torsion spring 300 maintains the power storage state. If the main drive shaft 210 rotates too much in the forward direction, the main drive shaft 210 is controlled to perform reverse rotational movement. Since the resistance of the first stop portion 2213 and the first stop groove 2232 in the reverse direction is smaller than the resistance of the first tooth portion 212 and the second tooth portion 2211 in the reverse direction, the stop member 221 rotates in the reverse direction in synchronization with the main drive shaft 210 during the reverse rotation of the main drive shaft 210, the first elastic arm 2212 is elastically deformed inward, and the first stop portion 2213 sequentially jumps in the first stop groove 2232. When the main driving shaft 210 is reversely rotated to a proper position, the first elastic arm 2212 makes the first stop portion 2213 be fitted into the corresponding first stop groove 2232, and thus, the stop 221 keeps the main driving shaft 210 at a rotated position, and the torsion spring 300 is in a torsion state.

The first stop groove 2232 may be disposed outside the stop member 221, and the first elastic arm 2212 is disposed on the transmission structure, which is not described in detail.

In a specific embodiment, the transmission structure includes a first transmission member 223 and a second transmission member 224, where the first transmission member 223 and the second transmission member 224 are connected in a clamping manner and coaxially disposed on the outer side of the main driving shaft 210, and of course, the first transmission member 223 and the second transmission member 224 may also be integrally formed. The rear end of the first transmission member 223 is provided with the second positioning portion 2231, and the inner side of the first transmission member 223 is provided with the first stop groove 2232, so that the rear end of the elastic member 222 abuts against the first transmission member 223. The front end portion of the second transmission member 224 is provided with the third positioning portion 2241, the inner side of the second transmission member 224 is provided with the annular flange 2242, the annular flange 2242 is rotationally embedded in the annular groove 2111 of the annular protrusion of the main driving shaft 210, and the main driving shaft 210 is rotationally connected with the second transmission member 224. It will be appreciated that the various components of the main drive shaft 210 and the stop assembly 220 may be assembled as a single unit to facilitate subsequent assembly within the housing 100; and the transmission structure is divided into two components for manufacturing, so that the difficulty of the manufacturing process of the transmission structure is reduced.

In some embodiments, referring to fig. 2 and 3, the pushing mechanism 400 further includes a fixing base 430, where the fixing base 430 is fixedly disposed on the inner side of the housing 100 and is disposed concentrically with the housing 100. The fixing base 430 is provided with a central shaft hole along the central shaft, the inner wall of the central shaft hole is provided with screw teeth, and the push rod 420 penetrates through the central shaft hole of the fixing base 430 and is in threaded connection with the fixing base 430. By the arrangement of the fixing base 430, the push rod 420 is screwed with the fixing base 430, thereby being screwed with the housing 100. The injection device adopts the structural form, and the overall manufacturing difficulty and the assembly difficulty of the injection device are reduced, and detailed description is omitted.

Further, the fixing seat 430 includes an inner ring portion 431, an outer ring portion 432, and a connecting portion 433, wherein the inner ring portion 431 is disposed inside the outer ring portion 432 and coaxially disposed, and the connecting portion 433 is connected between an outer peripheral surface of the inner ring portion 431 and an inner peripheral surface of the outer ring portion 432. The outer circumferential surface of the inner ring 431 is provided with a rear-facing annular stepped surface, and the transmission seat 410 is rotatably fitted on the outer side of the inner ring and is restrained between the front end portion of the main drive shaft 210 and the stepped surface.

Further, the inner wall of the outer ring portion 432 is sequentially provided with second stop grooves 4321 spaced around the central axis, the peripheral surface of the transmission seat 410 is provided with second elastic arms 412, the end portions of the second elastic arms 412 are provided with second stop portions 413, and the second stop portions 413 are embedded in the second stop grooves 4321, wherein the second stop portions 413 can be clamped in different second stop grooves 4321 when the transmission seat 410 rotates. Specifically, in the injection device injecting the medicine, the transmission seat 410 drives the push rod 420 to rotate synchronously, and the push rod 420 moves axially forward, so as to act on the medicine carrier 800; meanwhile, during the rotation process of the transmission seat 410, the second elastic arm 412 and the second stop portion 413 also rotate along with the circumferential direction, the second elastic arm 412 is elastically deformed, and the second stop portion 413 sequentially jumps into each second stop groove 4321, so that the injection device sounds and/or generates micro vibration during the injection process, and the medical staff is reminded that the injection device normally injects medicine into a patient.

The outer ring portion 432 and the transmission seat 410 are not limited to the above-mentioned connection method, for example, the second elastic arm 412 and the second stop portion 413 provided on the second elastic arm 412 are provided on the inner side of the outer ring portion 432, the second stop groove 4321 is provided on the outer circumferential surface of the transmission seat 410, and the second stop portion 413 can be engaged with a different second stop groove 4321 when the transmission seat 410 rotates.

In some embodiments, referring to fig. 1 and 2, the housing 100 includes a tail housing 120 and a head housing 110, the tail housing 120 is connected to the rear side of the fixing base 430, and the inner side of the front end of the tail housing 120 is clamped to the outer side of the fixing base 430. Wherein, the inner side of the tail housing 120 is used for installing the driving mechanism 200, the torsion spring 300 and the pushing mechanism 400 of the injection device, which is convenient for the medical staff to operate. The head shell 110 is connected to the front side of the fixing base 430, and the outer side of the rear end of the head shell 110 is clamped with the inner side of the fixing base 430. The inside of the head housing 110 defines a loading cavity, and the head housing 110 is used to load the drug carrier 800. And, the end of the head housing 110 remote from the tail housing 120 is provided with an injection needle 700 abutting the drug carrier 800, and when the push rod 420 structure acts on the tail of the drug carrier 800, the drug of the drug carrier 800 is injected into the patient through the injection needle 700.

In some embodiments, the main driving shaft 210 is provided with a limiting hole 213 along the central shaft, the limiting hole 213 penetrates to the front end surface of the main driving shaft 210, that is, the end of the main driving shaft 210 near the transmission seat 410, and a limiting surface 2131 facing to the front side is provided on the inner side of the limiting hole 213, and the limiting surface 2131 is used for limiting a limiting sleeve 230 described below. The injection device further comprises a limiting sleeve 230, wherein the limiting sleeve 230 is slidably arranged in the limiting hole 213 and circumferentially fixed with the main driving shaft 210, and the limiting sleeve 230 is in threaded connection with the push rod 420. Before the dose of the injection device is adjusted, the front end part of the limit sleeve 230 is propped against the rear end part of the transmission seat 410; when the main drive shaft 210 is rotated in a forward direction to adjust the dose of the injection device, the main drive shaft 210 drives the stop collar 230 to rotate synchronously. Because the push rod 420 is subjected to a larger resistance to rotation, the push rod 420 is kept still, and the stop collar 230 rotates spirally along the push rod 420, so that the push rod 420 moves axially backwards. When the stop collar 230 abuts against the stop face 2131, the injection device is adjusted to the set injection amount.

In order to ensure circumferential fixation between the stop collar 230 and the main driving shaft 210, the inner wall of the stop hole 213 is provided with a bar-shaped protrusion along the axial direction, the outer surface of the stop collar 230 is provided with a bar-shaped groove along the axial direction, and the bar-shaped protrusion is slidably embedded in the bar-shaped groove, so as to realize that the stop collar 230 is slidably arranged in the stop hole 213 and circumferentially fixed with the main driving shaft 210.

In order to ensure that the push rod 420 remains stationary during the dose adjustment of the injection device, in a further embodiment, referring to the figures, the inner wall of the fixing base 430 is sequentially provided with second stop grooves 4321 at intervals around the central axis, the circumferential surface of the transmission base 410 is provided with second elastic arms 412, the end parts of the second elastic arms 412 are provided with second stop parts 413, and the second stop parts 413 are embedded in the second stop grooves 4321. Specifically, in the dose adjusting process of the injection device, since the second stop portion 413 is embedded in the second stop groove 4321, the fixed seat 430 has circumferential resistance to the driving seat 410, so that the push rod 420 has circumferential resistance, and therefore, in the rotating process of the stop collar 230, the fixed seat 430 does not drive the push rod 420 to rotate in the rotating process due to the rotational resistance of the driving seat 410 to the push rod 420, so that the injection device is ensured to accurately adjust the injection quantity.

In some embodiments, the injection device further comprises a scale drum 500 and a transmission drum 600, wherein the scale drum 500 is arranged on the inner side of the tail shell 120 and is coaxially arranged with the tail shell 120, and the outer circumferential surface of the scale drum 500 is in threaded connection with the inner circumferential surface of the shell 100; meanwhile, the tail housing 120 is provided with an observation port 123, the outer circumferential surface of the scale drum 500 is provided with scale marks, and the observation port 123 is used for displaying the scale marks. The transmission cylinder 600 is slidably sleeved on the outer side of the main driving shaft 210 and circumferentially fixed to the main driving shaft 210, and the scale cylinder 500 is slidably sleeved on the outer side of the transmission cylinder 600 and circumferentially fixed to the transmission cylinder 600.

Specifically, in the injection device, during dose adjustment, the main drive shaft 210 rotates in a forward direction, the main drive shaft 210 drives the transmission barrel 600 to rotate in a forward direction, and the transmission barrel 600 drives the scale barrel 500 to rotate. Because the scale drum 500 is threadedly coupled to the tail housing 120, the scale drum 500 moves axially rearward during rotation, thereby displaying the scale markings on the surface of the scale drum 500 at the viewing port 123 so that the healthcare worker can know the dosage adjustment of the injection device. When the dosage of the injection device is adjusted to a proper size, the corresponding scale mark is just displayed on the observation port 123; wherein the main drive shaft 210 is separated from the transmission seat 410, and the push rod 420 is kept stationary during dose adjustment of the injection device.

Wherein, the outer peripheral surface of the transmission cylinder 600 is provided with a bar-shaped groove along the axial direction, the inner wall of the scale cylinder 500 is provided with a bar-shaped bulge along the axial direction, and the bar-shaped bulge is slidably embedded in the bar-shaped groove, so that the transmission cylinder 600 and the scale cylinder 500 are slidably arranged and circumferentially fixed; and, a side surface of the rear end portion of the main driving shaft 210 is provided with a bar-shaped groove along the axial direction, the inner wall of the driving cylinder 600 is provided with a bar-shaped protrusion, and the bar-shaped protrusion is slidably embedded in the bar-shaped groove, so that the main driving shaft 210 and the driving cylinder 600 are relatively slidably arranged and circumferentially fixedly arranged.

The injection device further includes a knob 130, and the knob 130 is rotatably coupled to the rear end portion of the tail housing 120. The inner side of the knob 130 is provided with a bar-shaped protrusion, and the bar-shaped protrusion is slidably embedded in the bar-shaped groove, so that the knob 130 and the transmission barrel 600 are relatively slidably arranged and circumferentially fixedly arranged, wherein the knob 130 has the function of limiting the transmission barrel 600, and the transmission barrel 600 is prevented from being separated from the main driving shaft 210. It will be appreciated that during dose adjustment of the injection device, a healthcare worker may drive the main driving shaft 210 to rotate through the knob 130, the main driving shaft 210 enables the torsion spring 300 to start storing force, and simultaneously drive the scale drum 500 to move axially backwards through the transmission drum 600, so as to judge the storing force of the torsion spring 300 through the scale drum 500, so as to know the subsequent injection amount of the injection device.

In some embodiments, the injection device further comprises a push button 140, the push button 140 being rotationally and axially slidably connected to the rear end of the knob 130, the knob 130 abutting against the rear end of the main drive shaft 210. During use of the injection device, a healthcare worker may push the main drive shaft 210 axially from the first position to the second position by pressing the button 140 axially forward.

The embodiments of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application. Furthermore, embodiments of the application and features of the embodiments may be combined with each other without conflict.

Claims

1. An injection device, comprising:

a torsion spring connected to the drive mechanism and to the housing;

2. An injection device according to claim 1, wherein the drive mechanism comprises:

3. An injection device according to claim 2, wherein the stop assembly comprises:

4. An injection device according to claim 3, wherein one of the transmission structure and the stopper is provided with a first elastic arm and a first stopper portion provided on the first elastic arm, and the other is provided with a first stopper groove at a circumferential interval, and the first stopper portion is engaged with the first stopper groove and is capable of sliding axially along the first stopper groove;

5. An injection device according to claim 3, wherein the transmission structure comprises:

6. An injection device according to claim 2, wherein the main drive shaft is provided with a limiting hole along a central axis, the limiting hole penetrating to an end of the main drive shaft adjacent to the transmission seat, the limiting hole being provided with a limiting surface facing the transmission seat;

7. An injection device according to claim 1, wherein the drive mechanism further comprises a fixed seat, the fixed seat is connected to the housing, the transmission seat is rotatably connected to the fixed seat, and the push rod is threadedly connected to the fixed seat.

8. The injection device according to claim 7, wherein one of the fixing base and the transmission base is provided with a second elastic arm and a second stop part arranged on the second elastic arm, and a second stop groove is arranged at intervals in the circumferential direction, and the second stop part is clamped in the second stop groove.

9. The injection device according to claim 8, wherein the fixing base comprises an outer ring part, a connecting part and an inner ring part, the connecting part is connected between the outer side of the inner ring part and the inner side of the outer ring part, and the transmission base is rotatably sleeved on the inner ring part; the second stop grooves are formed in the inner side of the outer ring part at intervals in the circumferential direction, and the transmission seat is provided with second elastic arms and second stop parts arranged on the second elastic arms.

10. An injection device according to claim 1, further comprising a scale drum and a transmission drum, wherein;