CN219271797U - Syringe and protective assembly thereof - Google Patents

Abstract

The utility model relates to an injector and a protective assembly thereof. The protection component is used for installing on the needle cylinder component, and the protection component includes the lag, is formed with in the elastic deformation lag in the lag atress can take place to hold the chamber, holds the chamber and is used for holding the injection needle, has seted up on the protection component with hold the hole of wearing to establish of chamber intercommunication, wears to establish the hole and is used for wearing to establish the injection needle, wears to establish the central axis of hole and the central axis of lag not on same straight line, is provided with on the outer wall of lag and presses the arch, presses the arch and can drive the lag and remove along the central axis direction of lag. At the first time of the injection of the medicine and the extraction of the injection needle, the pressing protrusion drives the protective sleeve to move towards the needle head direction of the injection needle, and finally the injection needle is separated from the penetrating hole and is completely covered in the accommodating cavity, so that the injection needle after injection is prevented from being exposed to the outside. The effect of preventing the secondary misuse of the injector is also realized.

Description

Syringe and protective assembly thereof

Technical Field

The utility model relates to the technical field of medical equipment, in particular to an injector and a protective component thereof.

Background

Medical staff need a large amount of disposable syringes used daily in the process of medicine injection, except the process of finishing medicine injection, the medical staff is protected firstly in the process of injection, and the disposable syringes need to be designed (or self-destructed) for preventing puncture and secondary misuse, so that cross infection is avoided. The disposable injector is used in China for over 500 hundred million years, the frequency of using the disposable injector by medical staff is quite high, the design of the efficient and stable protection device is very important, the quantity is huge, and the control of cost is extremely important. The most reasonable design for preventing the puncture and secondary misuse (self-destruction) of the disposable syringe is that the needle tip is wrapped at the first time after the injection needle of the syringe is pulled out of the human body, and the needle tip is not exposed again. The prior various disposable syringes can not pack the needle point at the first time of being pulled out from the human body, and the needle point can not be exposed outside again.

Disclosure of Invention

In view of the above, it is desirable to provide a syringe and a guard assembly thereof that cover the needle tip at the first time of withdrawal from the human body.

The utility model provides a protection subassembly, protection subassembly is used for installing on the needle cylinder subassembly, protection subassembly includes the lag, elastic deformation can take place for the lag atress, be formed with in the lag and hold the chamber, hold the chamber and be used for holding the injection needle, set up on the protection subassembly with hold the hole of wearing of chamber intercommunication, wear to establish the hole and be used for wearing to establish the injection needle, wear to establish the central axis of hole with the central axis of lag is not on same straight line, be provided with on the outer wall of lag and press the arch, press the arch can drive the lag along the central axis direction of lag removes.

In one embodiment, the through hole is provided with a check protrusion, and the check protrusion extends into the accommodating cavity and forms a check space with the inner wall of the accommodating cavity.

In one embodiment, the protection assembly further comprises a check piece, the accommodating cavity penetrates through two sides, far away from each other, of the protection sleeve to form a first mounting opening and a second mounting opening, the pressing protrusion is arranged at the first mounting opening, the check piece cover is arranged on the first mounting opening, the check piece is provided with a penetrating hole, the check piece is further provided with a check protrusion, and the second mounting opening is used for penetrating the needle cylinder assembly.

In one embodiment, the check member is formed with a fixing protrusion extending into the accommodating chamber and abutting against an inner wall of the accommodating chamber, and the check protrusion and the fixing protrusion are disposed with a space therebetween to form the check space.

In one embodiment, the check member comprises a first splicing part and a second splicing part, the first splicing part and the second splicing part are spliced and connected in the first installation opening, a first penetrating groove is formed in one side of the first splicing part facing the second splicing part, a second penetrating groove is formed in one side of the second splicing part facing the first splicing part, the first penetrating groove and the second penetrating groove enclose the penetrating hole together, a part of the check protrusion is located at the first penetrating groove, and the other part of the check protrusion is located at the second penetrating groove.

In another embodiment, the check is an integrally formed structural member.

The injector comprises a needle cylinder assembly, an injection needle and the protection assembly, wherein the protection assembly is arranged on the needle cylinder assembly, the injection needle is arranged in a containing cavity of the protection assembly, one end portion of the injection needle is arranged in the penetrating hole in a penetrating mode, the injection needle stretches out of the penetrating hole when the protection assembly is elastically deformed, the protection assembly is elastically reset, and meanwhile the pressing protrusion drives the protection sleeve to move along the central axis direction of the protection sleeve so that the injection needle can retract into the containing cavity.

In one embodiment, the syringe assembly further comprises a needle holder, the needle holder is mounted on the syringe, the injection needle is mounted on the needle holder, the needle holder is arranged in the second mounting opening in a penetrating manner, the outer wall of the needle holder can be abutted against the inner wall of the accommodating cavity, the protecting sleeve can move relative to the needle holder under the force of the protecting sleeve, and the moving direction of the protecting sleeve is the direction of the second mounting opening towards the first mounting opening.

In one embodiment, the second mounting opening is provided with a first limiting protrusion, the needle seat is used for mounting a second limiting protrusion on one end of the injection needle, and the first limiting protrusion can be abutted against one side of the second limiting protrusion facing the needle cylinder.

In one embodiment, the needle seat is used for being installed be provided with the spacing arch of third on the tip on the needle cylinder, the spacing arch of third with spacing protruding interval of second sets up, the spacing arch of third can be contradicted first spacing arch towards one side of syringe needle, during the lag elastic reset, the protection component can be followed the central axis direction of lag removes, first spacing arch is in under pressing protruding drive cross the spacing arch of third and can be contradicted on the spacing arch of second.

In one embodiment, the hub is a cylindrical member, the second spacing protrusion and the third spacing protrusion are annular protrusions surrounding the outer wall of the hub, and the diameter of the second spacing protrusion is greater than the diameter of the third spacing protrusion.

In one embodiment, the needle holder is further provided with a fourth limiting protrusion, the fourth limiting protrusion is located between the second limiting protrusion and the third limiting protrusion, and is spaced from the second limiting protrusion and the third limiting protrusion, the first limiting protrusion can abut against one side of the fourth limiting protrusion, which faces the second limiting protrusion, and when the protective sleeve elastically resets, the protective assembly can move along the central axis direction of the protective sleeve, and the first limiting protrusion can move beyond the fourth limiting protrusion and towards the second limiting protrusion under the driving of the pressing protrusion, which faces one side of the third limiting protrusion.

According to the injector and the protective component thereof, when the injector is not in use, the injection needle is arranged in the through hole in a penetrating way, and at the moment, the needle head of the injection needle is positioned outside the protective component. When the injector is used, the protective component is abutted against the skin of a human body along with the injection needle penetrating into the human body. Because the protective sleeve can be stressed to elastically deform, the protective sleeve is stressed to compress, so that the parts of the injection needle exposed out of the protective assembly are more and more, and the injection needle can be ensured to be better penetrated into a human body to complete injection. At the first time of pulling out the injection needle after the injection, the protecting sleeve is not stressed and is pressed, so that the protecting sleeve moves towards the needle head direction of the injection needle under the action of the elastic reset force. Simultaneously, medical personnel conflict on pressing the protruding one side that is dorsad human body with the cotton swab, make pressing the protruding can conflict on human skin. When the injection needle gradually withdraws from the human body, the protective sleeve gradually restores to an initial state under the action of elastic reset force, and meanwhile, the cotton swab is abutted against the pressing protrusion to drive the protective sleeve to move relative to the injection needle, so that the injection needle can be separated from the penetrating hole in the first time when the injection needle is pulled out of the human body, and the injection needle is completely covered in the accommodating cavity, and the injection needle after injection is prevented from being exposed outside. The pressing bulge can be pulled out from between the skin of the human body and the cotton swab at the moment, so that the cotton swab can be pressed on the human body. Because the injection needle wears to establish in wearing to establish the downthehole before using, the length direction of injection needle is unanimous with the central axis of wearing to establish the downthehole, and the injection needle is located the chamber entirely after having been injected, and the central axis of injection needle and lag is unanimous, and the central axis of wearing to establish the downthehole central axis of wearing simultaneously and lag is not on same straight line for when the injection needle is located the chamber entirely, the injection needle just can not wear out once more from wearing to establish the downthehole, has avoided the injection needle to expose in the external world once more, has also realized preventing the effect of secondary misuse to the syringe.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a syringe according to an embodiment;

FIG. 2 is a schematic view of the initial state of the syringe according to the embodiment of FIG. 1;

FIG. 3 is a schematic view of the embodiment of FIG. 1 showing the compression of the guard in use;

FIG. 4 is a schematic view of the syringe of the embodiment of FIG. 1 after use;

FIG. 5 is a schematic view of the check in the embodiment of FIG. 1;

FIG. 6 is a schematic view of a second splice in the embodiment of FIG. 5;

fig. 7 is a schematic view of the structure of the injection needle and the needle holder in the embodiment of fig. 1.

The elements in the figures are labeled as follows:

10. a syringe; 100. a protective assembly; 110. a protective sleeve; 111. a receiving chamber; 112. a first mounting port; 113. a second mounting port; 114. the first limiting protrusion; 120. pressing the bulge; 130. a check member; 131. penetrating holes; 132. a check protrusion; 133. a check space; 134. a fixing protrusion; 135. a first splice; 136. a second splice; 137. a first through groove; 138. a second through groove; 200. a syringe assembly; 210. a needle cylinder; 220. a needle stand; 221. the second limiting bulge; 222. a third limit protrusion; 223. a fourth limit protrusion; 300. an injection needle.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

Referring to fig. 1-5, in one embodiment of an injector 10, the injector 10 includes a shield assembly 100, a syringe assembly 200, and an injection needle 300. The protection component 100 is used for installing on syringe component 200, the protection component 100 includes lag 110, the elastic deformation can take place for the lag 110 atress, be formed with in the lag 110 and hold the chamber 111, hold the chamber 111 and be used for holding injection needle 300, set up on the protection component 100 with hold the hole 131 of wearing that the chamber 111 communicates, wear to establish the hole 131 and be used for wearing to establish injection needle 300, wear to establish the central axis of hole 131 and the central axis of lag 110 on different straight lines, be provided with on the outer wall of lag 110 and press protruding 120, press protruding 120 can drive lag 110 and remove along the central axis direction of lag 110. The protection assembly 100 is installed on the syringe assembly 200, the injection needle 300 is installed in the accommodating cavity 111 of the protection assembly 100, one end portion of the injection needle is penetrated in the penetrating hole, when the protection assembly 100 is elastically deformed, the injection needle 300 extends out of the penetrating hole 131, when the protection assembly 100 is elastically reset, the protrusion 120 is pressed simultaneously to drive the protection sleeve 110 to move along the central axis direction of the protection sleeve 110, so that the injection needle 300 is retracted into the accommodating cavity 111.

In the state where the syringe 10 is not in use, the injection needle 300 is inserted into the insertion hole 131, and the needle tip of the injection needle 300 is located outside the shielding assembly 100. In use of the syringe 10, the shield assembly 100 abuts against the skin of a person as the needle 300 penetrates the person. Because the protecting sleeve 110 can be elastically deformed under the force, the protecting sleeve 110 is compressed under the force (as shown in fig. 3), so that the part of the injection needle 300 exposed out of the protecting assembly 100 is more and more, and the injection needle 300 can be better penetrated into a human body to complete injection. At the first time of drawing out the injection needle 300 after the injection, the protecting sleeve 110 is not stressed and is pressed, so that the protecting sleeve 110 moves towards the needle head direction of the injection needle 300 under the action of the elastic restoring force. Meanwhile, the medical staff props the cotton swab against one side surface of the pressing protrusion 120, which is back to the human body, so that the pressing protrusion 120 can prop against the skin of the human body. When the injection needle 300 gradually exits from the human body, the protective sleeve 110 gradually returns to the initial state under the action of the elastic reset force, and the cotton swab is abutted against the pressing protrusion 120 to drive the protective sleeve 110 to move relative to the injection needle 300, so that the injection needle 300 can be separated from the penetrating hole 131 in the first time when the injection is completely pulled out of the human body and is completely covered in the accommodating cavity 111, and the injection needle 300 after the injection is prevented from being exposed to the outside. At this time, the pressing protrusions 120 can be drawn out from between the skin of the human body and the cotton swab, so that the cotton swab can be pressed on the human body. Because the injection needle 300 is worn in the through hole 131 before use, the length direction of the injection needle 300 is consistent with the central axis of the through hole 131, and the injection needle 300 is completely positioned in the accommodating cavity 111 after injection, the central axes of the injection needle 300 and the protective sleeve 110 are consistent, and meanwhile, the central axis of the through hole 131 and the central axis of the protective sleeve 110 are not on the same straight line, so that when the injection needle 300 is completely positioned in the accommodating cavity 111, the injection needle 300 cannot be worn out again from the through hole 131, the injection needle 300 is prevented from being exposed outside again, and the effect of preventing secondary misuse of the injector 10 is realized.

The pressing protrusion 120 is a sheet-like structure having elasticity, so that the pressing protrusion 120 can be pulled out from between the skin of the human body and the swab after the injection is completed. Of course, the pressing protrusion 120 may be made of other materials or have other structures. The main function of the pressing protrusion 120 is to facilitate the medical staff to drive the protecting sleeve 110 to move relative to the injection needle 300 through the cotton swab, and to separate the injection needle 300 from the through hole 131 and cover the injection needle completely in the accommodating cavity 111, so long as the material and structure satisfying the above effects can be equally regarded as the pressing protrusion 120 in the embodiment.

Since the injection needle 300 is penetrated into the penetration hole 131 in the initial state, the needle head is exposed to the outside. Therefore, the embodiment is provided with the needle shield, and the needle shield can cover the needle to avoid the pollution and accidental injury of the needle before use.

Referring to fig. 1, 5 and 6, in one embodiment, a check protrusion 132 is provided at the penetration hole 131, and the check protrusion 132 extends into the receiving chamber 111 and encloses a check space 133 with the inner wall of the receiving chamber 111. At the first time of drawing out the injection needle 300 after the injection of the medicine, the protection component 100 moves towards the needle head direction of the injection needle 300 under the action of the elastic reset force, meanwhile, the pressing protrusion 120 is pressed against the skin of the human body, and finally, the protection component 100 moves under the driving of the pressing protrusion 120, so that the injection needle 300 can be separated from the penetrating hole 131 in the first time after the injection and is completely covered in the accommodating cavity 111. The needle tip of the needle 300 is now located in the non-return space 133. The check protrusion 132 can prevent the needle of the injection needle 300 from moving toward the through hole 131 and penetrating into the through hole 131, thereby preventing the injection needle 300 from being exposed to the outside again and realizing the effect of preventing the secondary misuse of the injector 10.

Further, as shown in fig. 4, the projected portions of the check projection 132 and the needle tip of the injection needle 300 in the gravitational direction coincide. When the injection needle 300 moves relative to the protection component 100 in the accommodating cavity 111, the needle head can collide with the check protrusion 132, and the check protrusion 132 can limit the movement of the needle head towards the penetrating hole 131, and the needle head is prevented from being exposed to the external environment through the penetrating hole 131. The effect of preventing secondary misuse of the syringe 10 is achieved.

Specifically, as shown in fig. 5 and 6, a check protrusion 132 is provided along the outer edge of the penetration hole 131. I.e., check boss 132 is disposed around through-hole 131. It is further ensured that the needle head of the injection needle 300 is not re-exposed to the outside through the penetration hole 131 after the injection is completed. Alternatively, the penetration hole 131 is a circular hole, and the check protrusion 132 is a cylindrical protrusion. Of course, the through hole 131 is a circular hole, and the check protrusion 132 may be other polyhedrons, such as a triangular prism-shaped protrusion or a rectangular parallelepiped protrusion. Alternatively, the through hole 131 may be a rectangular hole or a triangular hole. The penetration hole 131 may be provided to ensure penetration and injection stability of the injection needle 300. It is of course preferable that the penetration hole 131 is a circular hole, and that the diameter of the penetration hole 131 is matched with the diameter of the injection needle 300. It will be appreciated that the inner wall of the penetration hole 131 is in contact with the outer wall of the injection needle 300.

Referring to fig. 1 to 4, in one embodiment, the protection assembly 100 further includes a check member 130, a first mounting opening 112 and a second mounting opening 113 are formed at two sides of the receiving cavity 111, which are far away from each other, penetrating through the protection sleeve 110, the pressing protrusion 120 is disposed at the first mounting opening 112, the check member 130 is covered on the first mounting opening 112, a penetrating hole 131 is formed in the check member 130, a check protrusion 132 is further disposed on the check member 130, and the second mounting opening 113 is used for penetrating through the syringe assembly 200. Specifically, the check 130 is detachably provided to the first mounting port 112. Alternatively, the check member 130 may be integrally provided on the protective cover 110 and cover the first mounting port 112.

Specifically, the pressing projection 120 is disposed around the outer edge of the first mounting port 112. The first mounting opening 112 is a circular opening, and the pressing protrusion 120 is a ring-shaped structure surrounding the first mounting opening 112. If the first mounting port 112 has another shape, the pressing protrusion 120 may have another shape matching the first mounting port 112.

Further, the protective sheath 110 is a tubular structure. The shield 110 is sleeved on one end of the syringe assembly 200 and has elasticity capable of being elastically deformed. Specifically, the protective sheath 110 is elastically deformed by a pressing force during injection, and the pressing force can compress and fold the protective sheath 110 (as shown in fig. 3). When the injection is completed, the protecting cover 110 loses the pressing force, the protecting cover 110 is restored from the compressed and folded state, and can move relative to the syringe assembly 200, so that the injection needle 300 is separated from the penetration hole 131 and is completely located in the accommodating chamber 111. The needle tip of the injection needle 300 is located in the non-return space 133.

In one embodiment, the sleeve 110 is pre-creased. When the protective cover 110 is pressed, the protective cover 110 can be orderly compressed and folded along folds (as shown in fig. 3). The lag 110 can be orderly compressed and folded during injection, so that the stability of the deformation of the lag 110 during injection is ensured, and the operation convenience and the experience of a patient during injection of medical staff can be improved. It should be noted that, the precondition of the crease setting is that the crease does not damage the structural strength of the protecting sleeve 110, and also does not damage the elasticity of the protecting sleeve 110. The crease is set to ensure that the protecting sleeve 110 can recover the initial state after the protecting sleeve 110 loses the pressing force, and ensure that the protecting sleeve 110 moves relative to one end of the syringe assembly 200, i.e. the protecting sleeve 110 has small elastic influence.

Referring to fig. 4 to 6, in one embodiment, a fixing protrusion 134 is formed on the check member 130, the fixing protrusion 134 extends into the receiving chamber 111 and abuts against an inner wall of the receiving chamber 111, and a check space 133 is formed between the check protrusion 132 and the fixing protrusion 134 at a distance. The fixing protrusions 134 increase the contact area between the check member 130 and the protective cover 110, and secure the structural stability of the protective assembly 100.

In one embodiment, the guard 110 is a resilient structural member. The protection sleeve 110 can be deformed in the radial direction of the first mounting port 112 in addition to being elastically deformed in the direction of the central axis of the protection sleeve 110 by the force. The outer diameter dimension of the fixing projection 134 is larger than the inner diameter of the first mounting port 112. When the check member 130 is covered on the first mounting opening 112, the first mounting opening 112 is elastically deformed, so that the fixing protrusion 134 can be inserted into the first mounting opening 112 and can abut against the inner wall of the first mounting opening 112, that is, the inner wall of the first mounting opening 112 can apply a pressing force to the fixing protrusion 134, and thus the mounting stability of the check member 130 on the protective sleeve 110 is ensured. It will be appreciated that the outer diameter of the fixing projection 134 is slightly larger than the inner diameter of the first mounting port 112 to ensure convenience in the mounting process of the check member 130. Since the protection cover 110 has elasticity, it is convenient to install, and the installation efficiency can be effectively improved. The structure is simple, the large-scale production can be facilitated, and the production and manufacturing cost is reduced.

Referring to fig. 5 and 6, in one embodiment, the check member 130 includes a first splicing portion 135 and a second splicing portion 136, the first splicing portion 135 and the second splicing portion 136 are spliced and connected in the first mounting port 112, a first penetrating groove 137 is formed on a side of the first splicing portion 135 facing the second splicing portion 136, a second penetrating groove 138 is formed on a side of the second splicing portion 136 facing the first splicing portion 135, the first penetrating groove 137 and the second penetrating groove 138 jointly enclose a penetrating hole 131, a part of the check protrusion 132 is located at the first penetrating groove 137, and another part of the check protrusion 132 is located at the second penetrating groove 138. A portion of the fixing projection 134 is located on the first splice 135 and another portion of the fixing projection 134 is located on the second splice 136. The check 130 is formed by splicing a first splice 135 and a second splice 136. The injection needle 300 is more conveniently penetrated into the penetrating hole 131 when being assembled, and then the assembly efficiency is improved. In another embodiment, check 130 is an integrally formed structure.

In the process of installing the injection needle 300, the first splicing part 135 and the second splicing part 136 are installed in the first installation opening 112. Under the elastic force of the protective sleeve 110, the inner wall of the first mounting opening 112 can apply a pressing force to the first splicing part 135 and the second splicing part 136, so that the injection needle 300 can be penetrated through by the structural integrity. Before the injection needle 300 is inserted into the insertion hole 131, the first splicing portion 135 and the second splicing portion 136 need to be separated in the radial direction of the first mounting hole 112. Because the protecting sleeve 110 has elastic force, at this time, the inner diameter of the first mounting hole 112 is increased, and a gap is generated between the first splicing part 135 and the second splicing part 136, so that the space between the first penetrating groove 137 and the second penetrating groove 138 is increased, that is, the inner diameter of the penetrating hole 131 is increased, and the injection needle 300 is conveniently penetrated in the penetrating hole 131. After the injection needle 300 is threaded, the first splicing part 135 and the second splicing part 136 are spliced completely again under the elastic force of the protective sleeve 110.

Referring to fig. 1, 2 and 7, in one embodiment, the syringe assembly 200 includes a syringe 210 and a needle holder 220, the needle holder 220 is used for being mounted on the syringe 210 and for being used for mounting an injection needle 300, the protection assembly 100 is connected to the needle holder 220, the needle holder 220 is arranged in the second mounting opening 113 in a penetrating manner, the outer wall of the needle holder 220 can abut against the inner wall of the accommodating cavity 111, the protection sleeve 110 can move relative to the needle holder 220 under force, and the moving direction of the protection sleeve 110 is the direction of the second mounting opening 113 towards the first mounting opening 112. The protection sleeve 110 is connected through the needle holder 220 and moves on the needle holder 220, so that the stability of the installation and movement of the protection sleeve 110 can be ensured.

Specifically, the needle mount 220 may be detachably mounted on the cylinder 210. Hub 220 may also be integrally connected to barrel 210.

Referring to fig. 1, 4 and 7, in one embodiment, a first limiting protrusion 114 is provided at the second mounting opening 113, a second limiting protrusion 221 is provided on an end of the needle holder 220 for mounting the injection needle 300, and the first limiting protrusion 114 can abut on a side of the second limiting protrusion 221 facing the syringe 210. When the injection is completed, the protecting sleeve 110 loses the pressing force, and the protecting sleeve 110 moves relative to the syringe 210, so that the injection needle 300 is separated from the penetrating hole 131 and is completely positioned in the accommodating cavity 111. By the cooperation between the first limiting protrusion 114 and the second limiting protrusion 221, the second limiting protrusion 221 can ensure that the protecting sleeve 110 is not separated from the needle seat 220 in the process of withdrawing the pressing protrusion 120, and then the injection needle 300 is exposed to the external environment again. Thereby improving the structural safety and reliability of the guard assembly 100.

Referring to fig. 1, 4 and 7, in one embodiment, the needle holder 220 is configured to be mounted on an end portion of the syringe 210 and provided with a third limiting protrusion 222, where the third limiting protrusion 222 and the second limiting protrusion 221 are spaced apart, when the protective cover 110 is elastically deformed, the third limiting protrusion 222 abuts against a side of the first limiting protrusion 114 facing the injection needle 300, and when the protective cover 110 is elastically restored, the protective assembly 100 moves along a central axis direction of the protective cover 110 by an elastic restoring force, and the first limiting protrusion 114 is subject to the elastic restoring force to pass over the third limiting protrusion 222 and can abut against the second limiting protrusion 221. In the initial state, the first limiting protrusion 114 and the third limiting protrusion 222 are abutted, so that the stability of the protecting sleeve 110 relative to the needle seat 220 and the stability of the injection needle 300 in the penetrating hole 131 are ensured. When the injection is completed, the protecting sleeve 110 loses the pressing force, the protecting sleeve 110 can pass through the third limiting protrusion 222 and is in a collision state with the third limiting protrusion 222 under the action of the elastic restoring force, and the protecting sleeve 110 can move on the needle seat 220 along the direction of the third limiting protrusion 222 towards the second limiting protrusion 221. The third limit protrusion 222 ensures structural stability of the shield 110 in the initial state, and also ensures structural stability and reliability of the entire syringe 10.

Referring to fig. 1, 2 and 4, in one embodiment, the hub 220 is further provided with a fourth limiting protrusion 223, the fourth limiting protrusion 223 is located between the second limiting protrusion 221 and the third limiting protrusion 222 and is spaced from the second limiting protrusion 221 and the third limiting protrusion 222, the first limiting protrusion 114 can abut against one side of the fourth limiting protrusion 223 towards the second limiting protrusion 221, when the protective sleeve 110 is elastically reset, the protective assembly 100 can move along the central axis direction of the protective sleeve 110, and the first limiting protrusion 114 can move from the fourth limiting protrusion 223 towards one side of the third limiting protrusion 222 to the second limiting protrusion 221 after being driven by the pressing protrusion 120. Therefore, when the protective cover 110 moves towards the syringe 210 under the action of gravity, the first limiting protrusion 114 can abut against one side of the fourth limiting protrusion 223 towards the second limiting protrusion 221, so that the protective cover 110 is limited to move towards the syringe 210, and the moving range of the injection needle 300 in the accommodating cavity 111 after being completely sleeved in the accommodating cavity 111 is indirectly limited, so that the reliability and the safety of the injector 10 are further ensured. It should be further noted that, the distance between the fourth limiting protrusion 223 and the second limiting protrusion 221 is the movable distance of the protecting sleeve 110 after the injection needle 300 is completely located in the accommodating cavity 111, and the movable distance of the protecting sleeve 110 needs to ensure that the injection needle 300 cannot be penetrated out of the check space 133 or the penetrating hole 131 again to be exposed to the external environment.

Referring to fig. 2, 4 and 7, in one embodiment, the hub 220 is a cylindrical member, and the second stop protrusion 221 and the third stop protrusion 222 are annular protrusions surrounding the outer wall of the hub 220, with the diameter at the second stop protrusion 221 being greater than the diameter at the third stop protrusion 222. Also, the diameter at the second limit projection 221 is larger than the diameter at the fourth limit projection 223. Thus, the protection sleeve 110 is ensured to break loose the limit of the third limit protrusion 222 in the moving process, but not slip off from the second limit protrusion 221. Further ensuring the reliability and practicality of the guard assembly 100. The diameter of the third limit projection 222 and the diameter of the fourth limit projection 223 are not particularly limited as long as the function stability of the third limit projection 222 and the fourth limit projection 223 in the foregoing embodiments can be ensured.

It should be further noted that the diameter of the second limiting boss 221, the diameter of the third limiting boss 222, and the diameter of the fourth limiting boss 223 should be larger than the diameter of the second mounting hole 113 after the first limiting boss 114 is mounted. Meanwhile, the cover 110 has elasticity. In the moving process of the protecting sleeve 110, the first limiting protrusion 114 can elastically deform when passing over the third limiting protrusion 222 and the fourth limiting protrusion 223 under the driving of the pressing protrusion 120, so as to ensure that the protecting sleeve 110 moves smoothly. In summary, the protecting sleeve 110 is capable of undergoing elastic deformation along the central axis direction of the protecting sleeve 110 and elastic deformation along the radial direction of the second mounting opening 113 during use of the syringe 10, and elastic deformation along the radial direction of the first mounting opening 112 when the first and second splicing parts 135 and 136 are mounted.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the direct conflict between the first and second features, or the indirect conflict between the first and second features through intermediaries. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a protection subassembly, its characterized in that, protection subassembly is used for installing on the needle cylinder subassembly, protection subassembly includes the lag, elastic deformation can take place for the lag atress, be formed with in the lag and hold the chamber, hold the chamber and be used for holding the injection needle, set up on the protection subassembly with hold the hole of wearing of chamber intercommunication, wear to establish the hole and be used for wearing to establish the injection needle, wear to establish the central axis of hole with the central axis of lag is not on same straight line, be provided with on the outer wall of lag and press the arch, press the arch can drive the lag is followed the central axis direction of lag removes.

2. The protective assembly of claim 1, wherein the through hole is provided with a non-return protrusion extending into the receiving cavity and enclosing a non-return space with an inner wall of the receiving cavity.

3. The protective assembly according to claim 2, further comprising a check member, wherein the receiving chamber is formed with a first mounting opening and a second mounting opening through the two sides of the protective sleeve that are far away from each other, the pressing protrusion is disposed at the first mounting opening, the check member is covered on the first mounting opening, the check member is provided with the penetrating hole, the check member is further provided with the check protrusion, and the second mounting opening is used for penetrating the syringe assembly.

4. The protective assembly of claim 3, wherein the check member has a fixing protrusion formed thereon, the fixing protrusion extending into the receiving chamber and abutting against an inner wall of the receiving chamber, the check protrusion and the fixing protrusion being spaced apart to form the check space.

5. The protective assembly according to claim 3, wherein the check member comprises a first splicing part and a second splicing part, the first splicing part and the second splicing part are spliced and connected in the first mounting port, a first penetrating groove is formed in one side of the first splicing part, which faces the second splicing part, a second penetrating groove is formed in one side of the second splicing part, which faces the first splicing part, the first penetrating groove and the second penetrating groove jointly enclose the penetrating hole, a part of the check protrusion is located at the first penetrating groove, and the other part of the check protrusion is located at the second penetrating groove; or (b)

The check member is an integrally formed structural member.

6. A syringe, the syringe comprising:

a syringe assembly;

an injection needle;

the protective assembly according to any one of claims 3-5, wherein the protective assembly is mounted on the syringe assembly, the injection needle is mounted in a containing cavity of the protective assembly, one end of the injection needle is arranged in the penetrating hole in a penetrating mode, the injection needle extends out of the penetrating hole when the protective assembly is elastically deformed, and the pressing protrusion drives the protective sleeve to move along the central axis direction of the protective sleeve when the protective assembly is elastically reset so that the injection needle is retracted into the containing cavity.

7. The syringe of claim 6, wherein the syringe assembly comprises a syringe and a needle holder, the needle holder is mounted on the syringe, the injection needle is mounted on the needle holder, the protective assembly is connected to the needle holder, the needle holder is arranged in the second mounting opening in a penetrating manner, the outer wall of the needle holder can be abutted against the inner wall of the accommodating cavity, the protective sleeve can move relative to the needle holder under force, and the moving direction of the protective sleeve is the direction of the second mounting opening towards the first mounting opening.

8. The syringe of claim 7, wherein a first limit projection is provided at the second mounting opening, a second limit projection is provided on an end of the needle mount for mounting the injection needle, and the first limit projection is capable of abutting on a side of the second limit projection facing the needle cylinder.

9. The syringe of claim 8, wherein the needle holder is provided with a third limiting protrusion on an end portion of the needle cylinder, the third limiting protrusion and the second limiting protrusion are arranged at intervals, the third limiting protrusion can abut against one side of the first limiting protrusion toward the injection needle, the protective cover can move along the central axis direction of the protective cover when elastically reset, and the first limiting protrusion is driven by the pressing protrusion to pass through the third limiting protrusion and move toward the second limiting protrusion.

10. The syringe of claim 9, wherein the hub is a cylindrical member, the second and third stop projections are annular projections surrounding an outer wall of the hub, and a diameter of the second stop projection is greater than a diameter of the third stop projection; and/or

The novel needle holder is characterized in that a fourth limiting protrusion is further arranged on the needle holder, the fourth limiting protrusion is located between the second limiting protrusion and the third limiting protrusion and is arranged at intervals of the second limiting protrusion and the third limiting protrusion, the first limiting protrusion can abut against one side of the fourth limiting protrusion, which faces the second limiting protrusion, when the protective sleeve elastically resets, the protective assembly can move along the central axis direction of the protective sleeve, and the first limiting protrusion can be driven by the fourth limiting protrusion to face one side of the third limiting protrusion to cross the fourth limiting protrusion and abut against the second limiting protrusion under the driving of the pressing protrusion.

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