CN117281979A

CN117281979A - Syringe protection device and safety syringe

Info

Publication number: CN117281979A
Application number: CN202310946170.8A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Fanying Shanghai Biotechnology Co ltd
Current assignee: Fanying Shanghai Biotechnology Co ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2023-12-26

Abstract

The application provides an injector protection device and safety injector, the injector includes the cylinder at least, set up the spacing recess that does not communicate with the inner chamber of cylinder on the lateral wall of cylinder, the device includes the protective sheath at least, the locating part, retaining part and elastic component, the through-hole has been seted up to the one end of protective sheath, under the first state, the cylinder cover is established the back pressure equipment of elastic component and is in the protective sheath, the needle is kept away from to the cylinder one end card and is established in the locating part, the needle passes the through-hole and exposes outside the protective sheath, under the second state, the needle is kept away from to the one end of needle and is kept away from the locating part, the retaining part card is established in the spacing recess, the needle is by the cladding inside the protective sheath. The application provides a syringe protection device, after the syringe uses, with in the syringe needle withdrawal protective sheath and restrict, avoid the secondary injury to the user, simplified pop-up mechanism simultaneously, the structure is simpler, has reduced the quantity of preparation material, more environmental protection.

Description

Syringe protection device and safety syringe

Technical Field

The application relates to the technical field of medical equipment, in particular to a syringe protection device and a safety syringe.

Background

Disposable syringes are currently the most commonly used devices in the medical field, and in order to prevent the needle of the used syringe from injuring the user by accident, causing medicine pollution, or the syringe is used for the second time, it is currently generally required to uniformly recover the needle after completing the injection. However, with further strict management of medical apparatuses, some mechanisms have required that a special protection device be added to the disposable syringe, and after the injection is completed, the protection device is started to protect the needle part, prevent accidental injury of the needle, also prevent the separation of the needle and the syringe body, and improve the use safety of the disposable syringe.

However, related injector protection devices in the prior art are limited by the performance of molding materials, protection requirements and the like, and most of the related injector protection devices have the problems of large overall volume, complex structure, large materials for a shell and a spring, low environmental protection, high manufacturing cost, inconvenient operation and the like.

Therefore, there is a need to propose a new syringe protection device to solve the above-mentioned problems.

Disclosure of Invention

In order to solve one or more of the above technical problems in the prior art, the embodiments of the present application provide a new syringe protection device and a safety syringe, so as to solve the problems of complex structure, inconvenient operation, high manufacturing cost and the like of the syringe protection device in the prior art.

In order to achieve the above purpose, the technical scheme adopted by the application for solving the technical problems is as follows:

in a first aspect, the present application provides an injector protection device, where the injector at least includes a syringe, a limit groove that is not communicated with an inner cavity of the syringe is formed on a side wall of the syringe, and the device at least includes a protective sleeve, a limit piece, a stop piece, and an elastic piece;

the protective sleeve is sleeved on the outer side of the needle cylinder, and one end of the protective sleeve is provided with a through hole;

the limiting piece and the stopping piece are arranged at one end of the protective sleeve far away from the through hole;

the elastic piece is sleeved on the needle cylinder, and the needle cylinder is sleeved with the elastic piece and then is pressed in the protective sleeve;

in the first state, the needle cylinder is sleeved with the elastic piece and then is pressed into the protective sleeve, one end of the needle cylinder, which is far away from the needle head, is clamped in the limiting piece, and the needle head passes through the through hole and is exposed out of the protective sleeve;

in the second state, one end of the needle cylinder, which is far away from the needle head, is far away from the limiting piece, the stopping piece is clamped in the limiting groove, and the needle head is coated inside the protective sleeve.

It will be appreciated that the protective sheath is hollow and the interior receiving space of the protective sheath is adapted to receive a barrel and/or needle.

Preferably, the protective sleeve is a hollow cylinder.

In a specific embodiment, the stopper includes a first connector connected to the protective sleeve and a first flange formed to extend radially inward of the protective sleeve at an end of the first connector remote from the protective sleeve;

the first connecting piece is arranged at an angle with the central shaft of the protective sleeve;

in the second state, the first flange is clamped in the limiting groove so as to limit the needle head entering the protective sleeve through the through hole to the interior of the protective sleeve.

In a specific embodiment, the number of the stop member and the limit groove each includes two;

the two stop pieces are oppositely arranged at one end of the protective sleeve, which is far away from the through hole, and the two limit grooves are oppositely arranged on the side wall of the needle cylinder.

In a specific embodiment, a guide block is further arranged on the outer wall of the needle cylinder, a guide groove matched with the guide block is formed in the side wall of the protective sleeve, and the guide block can reciprocate along the guide groove.

In a specific embodiment, the thickness of the guide block in the radial direction of the protective sleeve is smaller than the thickness of the side wall of the protective sleeve.

In a specific embodiment, the guide groove is arranged on a side wall of the protective sleeve along an axial direction of the protective sleeve.

In a specific embodiment, the number of guide grooves and the number of guide blocks each include two;

the two guide grooves are oppositely arranged on the side wall of the protective sleeve, and the two guide blocks are oppositely arranged on the side wall of the needle cylinder.

In a specific embodiment, the barrel includes oppositely disposed first and second ends, the first end being provided with a second flange extending radially outwardly from the barrel, the second end being provided with the needle;

the limiting piece comprises a second connecting piece connected with the protective sleeve, and a third flange formed by extending inwards along the radial direction of the protective sleeve at one end of the second connecting piece far away from the protective sleeve;

in the first state, the third flange abuts the second flange to press fit the syringe into the protective sleeve.

In a specific embodiment, the limiting members include at least two limiting members, and at least two limiting members are disposed opposite to or spaced from one another at one end of the protective sleeve.

In a specific embodiment, the material of the limiting member is an elastic material.

In a specific embodiment, the elastic member comprises a spring.

The second aspect, corresponding to the above-mentioned syringe protecting device, further provides a safety syringe, which comprises a syringe and a push rod which are matched with each other, and further comprises the above-mentioned syringe protecting device, wherein a limit groove which is not communicated with the inner cavity of the syringe is formed in the side wall of the syringe;

the device at least comprises a protective sleeve, a limiting piece, a stopping piece and an elastic piece;

In a specific embodiment, the guide block is disposed below the limit groove.

In a specific embodiment, the guide block is integrally formed with or attached to the outer wall of the syringe.

The beneficial effects that technical scheme that this application embodiment provided brought are:

the injector protection device and the safety injector provided by the embodiment of the application at least comprise a needle cylinder, wherein a limit groove which is not communicated with the inner cavity of the needle cylinder is formed in the side wall of the needle cylinder, and the injector protection device at least comprises a protective sleeve, a limit piece, a stop piece and an elastic piece; the protective sleeve is sleeved on the outer side of the needle cylinder, and one end of the protective sleeve is provided with a through hole; the limiting piece and the stopping piece are arranged at one end of the protective sleeve far away from the through hole; the elastic piece is sleeved on the needle cylinder, and the needle cylinder is sleeved with the elastic piece and then is pressed in the protective sleeve; in the first state, the needle cylinder is sleeved with the elastic piece and then is pressed into the protective sleeve, one end of the needle cylinder, which is far away from the needle head, is clamped in the limiting piece, and the needle head passes through the through hole and is exposed out of the protective sleeve; in the second state, one end of the needle cylinder, which is far away from the needle head, is far away from the limiting piece, the stopping piece is clamped in the limiting groove, and the needle head is coated inside the protective sleeve. The application provides a syringe protection device, after the syringe uses, with in the syringe needle withdrawal protective sheath and restrict, avoid the secondary injury to the user, simplified pop-up mechanism simultaneously, the structure is simpler, has reduced the quantity of preparation material, more environmental protection.

Drawings

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

FIG. 1 is an exploded view of a syringe protection device provided in an embodiment of the present application;

FIG. 2 is a schematic view of a syringe protection device according to an embodiment of the present disclosure in an unused state of a syringe after the syringe is assembled with the syringe;

FIG. 3 is a schematic view of a syringe protection device according to an embodiment of the present disclosure in a state of being used after the syringe is assembled with the syringe;

fig. 4 is a schematic structural view of a protective sleeve of a syringe protection device according to an embodiment of the present application;

fig. 5 is a schematic view showing a partial structure of a protective sleeve of a syringe protection device according to an embodiment of the present application

Fig. 6 is an exploded view of a safety syringe provided in an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As described in the background art, the existing injector integrated protection device is limited by the performance of molding materials, protection requirements and the like, and most of the existing injector integrated protection device has the problems of large overall volume, complex structure, large materials for a shell and a spring, low environmental protection, high manufacturing cost, inconvenient operation and the like.

In order to solve one or more of the above problems, the inventive syringe protection device is provided in the embodiments of the present application, and the device is sleeved outside the syringe when in use, and is configured to apply pressure to the limiting member through the push rod or other modes when the push rod of the syringe is pressed to the bottom when the syringe is used, so that the syringe is released from the limiting member under the thrust of the elastic member, and the needle head enters the inside of the protective sleeve through the through hole, thereby solving the problem of secondary injury to people after the syringe injection is completed.

In the embodiments of the present application, specific materials and manufacturing processes of the syringe protection device and the safety syringe are not specifically limited, and any known materials may be used in the embodiments of the present application without departing from the inventive concept of the present application. As an exemplary, but not limiting illustration, the syringe protection device and the safety syringe disclosed in the embodiments of the present application may be prepared by using a 3D printing technology with polymer materials meeting requirements, and the specific preparation process is not in the protection scope of the present application, and is not described in detail herein.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Example 1

The utility model provides an injector protection device, cover are established in the outside of syringe, and injector protection device can wrap up the syringe needle after the syringe uses, prevents to the secondary injury of people. Referring to fig. 1 to 4, the syringe protector generally comprises a protective cover 100, an elastic member 200, a stopper 300, a stopper 400, etc., and the syringe used with the syringe protector generally comprises at least a cylinder 500 and a push rod 600 which are engaged with each other. A limit groove 510 which is not communicated with the inner cavity of the syringe is formed on the side wall of the syringe 500. Preferably, the elastic member 200 is a spring. The protecting sleeve 100 is used for being sleeved outside the syringe 500, one end of the protecting sleeve 100 is provided with a limiting piece 300 and a stopping piece 400, and the other end is provided with a through hole 110. The elastic member 200 is sleeved on the needle cylinder 500, and the needle cylinder 500 is sleeved with the elastic member 200 and then is pressed into the protective sleeve. Referring to fig. 2 and 3, in the first state, the syringe 500 is press-fitted into the protective case 100 after being sleeved with the elastic member 200, one end of the syringe 500, which is far away from the needle, is stuck in the stopper 300, and the needle passes through the through hole 110 to be exposed outside the protective case 100 for subsequent injection; in the second state, after the push rod 600 applies pressure to the limiting member 300, the syringe 500 is released from the limiting member 300 under the pushing force of the elastic member 200, and the needle enters the inside of the protective sleeve 100 through the through hole 110, and the stopper 400 is clamped in the limiting groove 510, so as to prevent the needle from being exposed outside the protective sleeve 100 and causing secondary injury to a person due to falling of the syringe. Wherein the first state includes, but is not limited to, a syringe unused state and the second state includes, but is not limited to, a syringe post-use state.

It should be noted that, in the embodiment of the present application, the shape of the protective sleeve 100 is not specifically limited, and as an illustrative, but non-limiting example, the protective sleeve 100 is a hollow structure, and preferably, the protective sleeve 100 is a hollow cylinder. It will be appreciated that the interior of the protective sheath 100 defines a receiving space for receiving a barrel and/or needle.

It should be noted that, in the embodiment of the present application, in the state after the syringe is used, the needle completely enters the inside of the protective sleeve through the through hole, so as to avoid secondary injury to the human body.

Referring to fig. 1 to 4, in the embodiment of the present application, the side wall of the protective sleeve 100 is further provided with a guide groove 120, and correspondingly, the outer wall of the syringe 500 is provided with a guide block 520, and it is understood that the guide block 520 can move along the guide groove 120. The size and shape of the guide block 520 are adapted to the size and shape of the guide groove 120, and preferably the guide block 520 size is slightly smaller than the guide groove 120 size (i.e., the groove width of the guide groove) in a direction perpendicular to the direction of movement of the guide block 520. It should be noted that, in the embodiment of the present application, the shape of the guide block 520 is not specifically limited, and any known shape may be used as the shape of the guide block 520 without departing from the inventive concept of the present application. By way of example and not limitation, the guide block 520 in the practice of the present application is rectangular.

In a preferred embodiment, the thickness of the guide block 520 in the radial direction of the protective sleeve 100 is smaller than the thickness of the side wall of the protective sleeve 100. This facilitates entry of the guide block 520 into the protective sheath when the syringe is assembled into the protective sheath.

As an alternative embodiment, in the embodiment of the present application, the guide block 520 is integrally formed with the outer wall of the syringe.

As another optional implementation manner, in this embodiment of the present application, the guide block 520 is connected to the outer wall of the syringe, where a specific connection manner between the guide block 520 and the outer wall of the syringe is not limited, and as an example, the guide block 520 and the outer wall of the syringe may be connected by using a manner of mounting, gluing, or the like.

With further reference to fig. 4, the guide grooves 120 are disposed on the sidewall of the protective case 100 in the axial direction of the protective case 100. The guide groove 120 includes a groove body 121, and a first restriction point 122 and a second restriction point 123 at different positions of the groove body 121. The guide block 520 is movable in the groove body 121 and is movable along the groove body 121 to the first limit point 122 or the second limit point 123. The slot 121 is formed on and penetrates the side wall of the protective sleeve 100, and preferably, the slot 121 is a rectangular long hole penetrating the side wall of the protective sleeve 100. In a first condition (e.g., an unused condition of the injector), the syringe 500 is press-fitted into the protective sheath 100, an end of the syringe 500 remote from the needle is engaged in the stopper 300, the needle is exposed outside the protective sheath 100 through the through-hole 110, and the guide block 520 is located at the first restriction point 122 in the guide groove 120. In the second state (e.g. the state after the injector is used), after the push rod 600 applies pressure to the stopper 300, the syringe 500 is released from the stopper 300 under the pushing force of the elastic member 200, the needle enters the inside of the protective sheath 100 through the through hole 110, the stopper 400 is clamped in the stopper groove 510, and at this time, the guide block 520 is located at the second stopper 123 in the guide groove 120.

It will be appreciated that the first limiting point 122 is disposed at an end of the guide groove 120 near the through hole 110, and the second limiting point 123 is disposed at an end of the guide groove 120 far from the through hole 110. Thus, in a first state (e.g., an unused state of the injector), the syringe 500 is press-fitted into the protective sheath 100, and an end of the syringe 500 away from the needle is engaged with the stopper 300, and when the guide block 520 is located at the first limiting point 122 in the guide groove 120, the needle can be exposed outside the protective sheath 100 through the through hole 110. In the second state (e.g., the state after the syringe is used), after the push rod 600 applies pressure to the stopper 300, the syringe 500 is released from the stopper 300 under the pushing force of the elastic member 200, and when the guide block 520 is located at the second limiting point 123 in the guide groove 120, the needle head can be completely enclosed by the protective sheath 100 after entering the interior of the protective sheath 100 through the through hole 110.

As a preferred embodiment, in the embodiment of the present application, the guide block 520 is disposed below the limit groove 510.

As a preferred embodiment, the number of the guide grooves 120 and the guide blocks 520 may be one or more, preferably, the number of the guide blocks 520 may be two, and correspondingly, the number of the guide grooves 120 also includes two, and each guide block 520 is matched with one of the guide grooves 120. It is further preferred that the two guide blocks 520 are symmetrically disposed on the outer wall of the cylinder 500 and the two guide grooves 120 are symmetrically disposed on the side wall of the protective cover 100. It can be appreciated that the guide blocks 520 and the guide grooves 120 are symmetrically arranged, which is beneficial to the smooth movement of the guide blocks 520 in the guide grooves 120 and the avoidance of jamming.

It will be appreciated that the barrel 500 includes oppositely disposed first and second ends, the first end being provided with a second flange 530 and the second end being provided with a needle 540. Specifically, the second flange 530 is formed at the first end of the syringe 500 extending radially outward of the syringe. Correspondingly, as a preferred embodiment, the limiting member 300 includes a second connecting member 310 and a third flange 320. With further reference to fig. 4, the second connector 310 is coupled to the protective sheath 100 and a third flange 320 is formed extending radially inward of the protective sheath at an end of the second connector 310 remote from the protective sheath. When the syringe 500 is press-fitted into the protective sheath 100 in the unused state of the injector, the third flange 320 abuts the second flange 530 to press-fit the syringe 500 into the protective sheath 100.

It is understood that, as a preferred embodiment, the limiting member 300 is integrally formed with the protective sheath 100 in the present embodiment.

As an alternative embodiment, the stop 300 is a separate component that fits over the protective cover 100.

Referring further to fig. 4, in this embodiment, a notch (not shown) is formed by recessing a side edge of the third flange 320 away from the second connector 310 inward (i.e., toward the connector 310), and the size and shape of the notch (not shown) are matched with those of the push button cap 610 of the push rod 600. For example, as an illustrative and non-limiting illustration, where push button cap 610 is cylindrical, the notch is a circular arc formed by an inward depression. The notch may facilitate release of the syringe by the limiter when the push rod 600 applies pressure to the limiter.

As a preferred embodiment, in this embodiment, the limiting members 300 include at least two, when the number of limiting members 300 is two, the two limiting members 300 are disposed opposite to each other at one end of the protecting sleeve 100, and when the number of limiting members 300 is more than two, the limiting members 300 are disposed at intervals at one end of the protecting sleeve 100.

As a preferred example, the stopper may be biased by a push rod in embodiments of the present application to release the first flange of the syringe from the stopper. The material of the limiting member 300 is preferably an elastic material. So configured, during use of the injector, when the plunger 600 applies pressure to the stopper 300 as the plunger derives the bottom of the syringe, the stopper 300 is deformed, thereby releasing the second flange 530 of the syringe 500 restrained therein, so that the syringe moves away from the through-hole under the pushing force of the elastic member, thereby allowing the needle to enter the inside of the protective case through the through-hole.

As a preferred embodiment, the stopper 400 includes a first connector 410 and a first flange 420. Referring to fig. 5, the first connector 410 is coupled to the protective sheath 100, and the first flange 420 is formed to extend radially inward of the protective sheath at an end of the first connector 410 remote from the protective sheath. The first connector 410 is disposed at an angle to the central axis of the protective sleeve 100, and preferably the end of the first connector 410 where the first flange 420 is disposed is slightly inclined toward the interior of the protective sleeve. When the syringe 500 is press-fitted into the protective case 100 in a state after the syringe is used, the first flange 420 is caught in the limit groove 510, so as to prevent the needle from being exposed outside the protective case 100 to cause secondary injury to a person due to falling of the syringe.

As a preferred embodiment, in the embodiment of the present application, the number of the stop members 400 and the number of the limit grooves 510 each include two, and each stop member 400 is matched with one of the limit grooves 510. Further preferably, two stoppers 400 are symmetrically arranged at one end of the protective cover 100, and two stopper grooves 510 are symmetrically arranged on the sidewall of the cylinder 500. It can be appreciated that the stopper 400 and the limit groove 510 are symmetrically arranged, so that the limit effect of the stopper 400 is further ensured, and the limit groove 510 is prevented from being separated from the stopper 400.

It will be appreciated that, as a preferred embodiment, the stop 400 is integrally formed with the protective sheath 100 in the present example.

As an alternative embodiment, stop 400 is a separate component that fits over protective sleeve 100.

In order to reduce the usage amount of the manufacturing material of the protective sleeve and reduce the cost, in this embodiment of the present application, at least one weight-reducing groove (not shown) is further provided on the protective sleeve. Referring further to fig. 4, the weight-reducing groove is provided on and penetrates the side wall of the protective sleeve. The number, the size and the shape of the weight-reducing grooves are not specifically limited, and a user can set according to actual requirements. By way of example and not limitation, in embodiments of the present application, the weight-reducing grooves may be shaped in any regular pattern or any irregular pattern such as rectangular, circular, triangular, trapezoidal, diamond, etc.

Example two

Corresponding to the above-described syringe protection device, the present embodiment provides a safety syringe including a cylinder 500 and a push rod 600 which are engaged with each other, and the syringe protection device as described above, including a protective case 100, an elastic member 200, a stopper 300, and a stopper 400, as shown in fig. 5. Wherein, the side wall of the syringe 500 is provided with a limit groove 510 which is not communicated with the inner cavity of the syringe. One end of the protective sleeve 100 is provided with a limiting piece 300 and a stopping piece 400, and the other end is provided with a through hole 110. The relevant contents of the syringe protection device can be referred to in embodiment 1, and will not be described in detail here.

Referring further to fig. 2 and 3, in a first state (e.g., an unused state of the injector), the syringe 500 is sleeved with the elastic member 200 and then press-fitted into the protective sleeve 100, one end of the syringe 500, which is far away from the needle, is clamped in the stopper 300, and the needle passes through the through hole 110 to be exposed outside the protective sleeve 100 for subsequent injection; in the second state (e.g. after the injector is used), after the push rod 600 applies pressure to the limiting member 300, the syringe 500 is released from the limiting member 300 under the pushing force of the elastic member 200, the needle enters the inside of the protective sleeve 100 through the through hole 110, and the stopper 400 is blocked in the limiting groove 510, so as to avoid secondary injury to the human body caused by exposure of the needle outside the protective sleeve 100 due to falling of the syringe.

Referring to fig. 6, barrel 500 generally includes a limit groove 510, a guide block 520, a second flange 530, a needle 540, a needle mount 550, a fluid inlet 560, a needle cap 570, and a barrel 580. Both the limit groove 510 and the guide block 520 are disposed on the sidewall of the barrel 580, and preferably, the guide block 520 is disposed below the limit groove 510, and the guide block 520 is movable along the guide groove 120. The cylinder 580 is formed therein with an accommodating space for storing a medicine liquid to be injected. Needle holder 550 and liquid inlet 560 are disposed at opposite ends of barrel 580 and each communicate with the receiving space inside barrel 580. Needle 540 is disposed in needle mount 550 and communicates with the receiving space inside barrel 580 for subsequent injection of a medical fluid. The cap 570 is disposed over the needle 540 to protect the needle 540 from contamination and to protect personnel from puncture by the needle.

With further reference to fig. 6, the push rod 600 includes a push button cap 610, a connecting rod 620, and a seal 630. The push button cap 610 and the sealing member 630 are respectively connected to opposite ends of the connection rod 620. The push button cap 610 is used to provide a point of force to the relevant person when the syringe is in use. Seal 630 is an interference fit with the syringe to avoid syringe leakage. Preferably, the push button cap 610 is made of the same material as the connecting rod 620, and the sealing member 630 is made of an elastic material. Further preferably, the push button cap 610 is integrally formed with the connecting rod 620, and the sealing member 630 is screw-coupled with the connecting rod 620. Illustratively, the sealing member 630 is provided with an internal thread, and an end of the connecting rod 620 connected to the sealing member 630 is provided with an external thread matching the internal thread, and the sealing member 630 and the connecting rod 620 are screwed through the internal thread and the external thread.

When the safety syringe is assembled, firstly, the elastic member 200 is put into the protective sleeve 100, the syringe barrel 500 integrally passes through the interior of the protective sleeve 100 and the elastic member 200, specifically, the needle fixing member 550 and the needle 540 of the barrel 500 pass through the elastic member 200, the needle fixing member 550 and the needle 540 partially penetrate through the through hole 110 formed at the bottom of the protective sleeve 100 and are exposed outside the protective sleeve 100, the guide block 520 enters the interior of the protective sleeve from the stop member 400 (in particular, one end of the stop member 400 far away from the protective sleeve 100 can be pulled outwards to deform the guide block 520) and enters the guide groove 120 until the guide block moves to the first limiting point 122, at this time, the elastic member 200 forms elastic force under the extrusion of the barrel 500 and the protective sleeve 100, the limiting member 300 on the protective sleeve 100 is buckled on the second flange 530 of the barrel 500, the barrel 500 is limited, and the barrel 500 and the protective sleeve 100 are prevented from being sprung by the elastic member 200. The cap 570 is sealed to the needle 540. After the liquid medicine is filled from the liquid inlet 560 at the top of the cylinder 500, the connection rod 620 of the push rod 600 is screw-coupled with the sealing member 630 and then inserted into the cylinder 500 to form the whole of the safety syringe (i.e., the syringe in an unused state).

In use of the safety syringe, the cap 570 is removed from the needle 540, the push button cap 610 is pressed downwardly to squeeze the medical fluid, and after the medical fluid is injected, the push button cap 610 reaches the first end of the cylinder 500 and presses the third flange 320 of the stopper 300 of the protective sheath 100, and the cylinder 500 is dislocated from the stopper 300. The elastic element 200 reversely flicks the needle cylinder 500, the protective sleeve 100 reversely flicks at the first limiting point 122 of the guide groove 120, the guide block 520 reversely moves from the first limiting point 122 of the guide groove 120 to the second limiting point 123 of the guide groove 120, the needle 540 enters the protective sleeve 100 through the through hole 110 and is covered by the protective sleeve 100, the use state is finished, and meanwhile, the limiting groove 510 is clamped by the stop element 400, so that the needle cylinder 500 and the protective sleeve 100 cannot move to expose the needle 350, and the protective sleeve has a protective effect, and secondary injury to people is avoided.

In the description of the present application, it should be understood that the terms "vertical," "parallel," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. 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 one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The foregoing description of the preferred embodiments of the present application is not intended to limit the invention to the particular embodiments of the present application, but to limit the scope of the invention to the particular embodiments of the present application.

Claims

1. The injector protection device at least comprises a needle cylinder, wherein a limit groove which is not communicated with the inner cavity of the needle cylinder is formed in the side wall of the needle cylinder;

2. The syringe protector of claim 1, wherein the stopper comprises a first connector connected to the protective sheath and a first flange formed to extend radially inward of the protective sheath at an end of the first connector remote from the protective sheath;

3. The syringe protection apparatus of claim 2, wherein the number of stops and limit grooves each comprises two;

4. A syringe protection apparatus according to any one of claims 1 to 3, wherein a guide block is further provided on the outer wall of the syringe, and a guide groove is provided on the side wall of the protective sleeve, which is matched with the guide block, and the guide block can reciprocate along the guide groove.

5. The syringe protector of claim 4, wherein the guide block has a thickness in a radial direction of the protective sleeve that is less than a thickness of a side wall of the protective sleeve.

6. The syringe protector of claim 4, wherein the guide slot is disposed on a side wall of the protective sheath in an axial direction of the protective sheath.

7. The syringe protection apparatus of claim 6, wherein the number of guide slots and guide blocks each comprises two;

8. A syringe protection arrangement according to any one of claims 1 to 3, wherein the barrel comprises oppositely disposed first and second ends, the first end being provided with a second flange extending radially outwardly from the barrel, the second end being provided with the needle;

9. The syringe protector of claim 8, wherein said stopper comprises at least two of said stoppers disposed opposite or spaced apart at one end of said protective sheath.

10. The syringe protector of claim 9, wherein the stopper is made of an elastic material.

11. A syringe protection arrangement according to any one of claims 1 to 3, wherein the resilient member comprises a spring.

12. A safety syringe comprising a barrel and a ram cooperating with each other, further comprising a syringe protection device according to any one of claims 1 to 11;

a limit groove which is not communicated with the inner cavity of the needle cylinder is formed in the side wall of the needle cylinder;

13. The safety syringe of claim 12, wherein a guide block is further provided on the outer wall of the syringe, and a guide groove is provided on the side wall of the protective sleeve and is matched with the guide block, and the guide block can reciprocate along the guide groove.

14. The safety syringe of claim 13, wherein the guide block is disposed below the limit groove.

15. The injector protection device of claim 14, wherein the guide block is integrally formed with or attached to an outer wall of the syringe.