Syringe protection device and safety syringe

Abstract

The present application provides a syringe protection device and a safety syringe. The syringe at least comprises a barrel, and a limiting protrusion is provided on the outer wall of the barrel; the device at least comprises a protective sleeve and an elastic member; the protective sleeve is sleeved on the end outside the barrel close to a needle, a through hole is formed in one end of the protective sleeve, and a first limiting hole and a second limiting hole are formed in the side wall of the protective sleeve; in a first state, the barrel is press-fitted into the protective sleeve, the limiting protrusion is snap-fitted in the first limiting hole, and the needle passes through the through hole and is exposed outside the protective sleeve; and in a second state, the limiting protrusion is snap-fitted in the second limiting hole, and the needle is covered in the protective sleeve. According to the syringe protection device provided by the present application, after a syringe is used, the position of a barrel relative to a protective sleeve is changed by changing the position of a limiting protrusion, so that a needle enters the protective sleeve via a through hole, thereby solving the problem of secondary damage to a person when injection of the syringe is completed.

Description

Syringe protection device and safety syringe Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a syringe protection device and a safety syringe. Background Art

[0002] Disposable syringes are currently the most commonly used medical devices. To prevent the needle from accidentally injuring the user, causing drug contamination, or the syringe from being reused, it is generally required that the needle be collected and recycled after the injection is completed. However, with the further tightening of medical device management, some institutions have required the installation of special protective devices on disposable syringes. After the injection is completed, the protective device is activated to protect the needle part, preventing accidental injury from the needle and preventing the needle from separating from the syringe body, thereby improving the safety of disposable syringes.

[0003] However, the related syringe protection devices in the existing technology are limited by the properties of the molding materials and the protection requirements. Most of them have problems such as large overall size, complex structure, large shell and spring materials, low environmental protection, high production cost, and inconvenient operation.

[0004] Therefore, it is urgent to propose a new syringe protection device to solve the above problems.

[0005] Summary of the Invention

[0006] In order to solve one or more of the above-mentioned technical problems existing in the prior art, the embodiments of the present application provide a new syringe protection device and a safety syringe to solve the problems of complex structure, inconvenient operation, high manufacturing cost, etc. existing in the syringe protection device in the prior art.

[0007] In order to achieve the above objectives, the technical solutions adopted by this application to solve the technical problems are:

[0008] In a first aspect, the present application provides a syringe protection device, wherein the syringe comprises at least a syringe barrel, characterized in that a limiting protrusion is provided on the outer wall of the syringe barrel, and the device comprises at least a protective sleeve and an elastic member;

[0009] The protective sleeve is arranged on the outer side of the syringe near the end of the needle, a through hole is opened at one end of the protective sleeve, and a first limiting hole and a second limiting hole are opened on the side wall of the protective sleeve;

[0010] The elastic member is sleeved on the syringe, and the syringe is press-fitted into the protective sleeve after the elastic member is sleeved on the syringe;

[0011] In the first state, the syringe is pressed into the protective sleeve, the limiting protrusion is locked in the first limiting hole, and the needle passes through the through hole and is exposed outside the protective sleeve;

[0012] In the second state, the limiting protrusion is locked in the second limiting hole, and the needle is covered inside the protective sleeve.

[0013] It can be understood that the protective sleeve is a hollow structure, and the internal accommodating space of the protective sleeve is used to accommodate the syringe and / or needle.

[0014] Preferably, the protective cover is a hollow cylinder.

[0015] In a specific embodiment, the first limiting hole is provided on an end of the side wall of the protective cover close to the through hole, and the second limiting hole is provided on an end of the side wall of the protective cover away from the through hole.

[0016] In a specific embodiment, a first passage groove is further provided on the side wall of the protective cover, the first passage groove connects the first limiting hole and the second limiting hole, and the limiting protrusion can move along the first passage groove to the first limiting hole or the second limiting hole.

[0017] In a specific embodiment, the first passage groove comprises at least a first portion, a second portion, and a third portion that are interconnected, the second portion is arranged along the axial direction of the protective sleeve, and the first portion and the third portion are both arranged at an angle to the second portion;

[0018] The first limiting hole is located at an end of the third portion away from the second portion, and the second limiting hole is located at an end of the first portion away from the second portion.

[0019] In a specific embodiment, the first passage groove comprises at least a first portion, a second portion, and a third portion that are interconnected, the second portion is arranged along the axial direction of the protective sleeve, and the first portion and the third portion are both arranged at an angle to the second portion;

[0020] The first limiting hole is located at an end of the third portion away from the second portion, and the second limiting hole is located at an end of the second portion close to the first portion.

[0021] In a specific embodiment, the protective cover further includes a stop structure provided at one end of the first part close to the second part;

[0022] The stopping structure includes a first protrusion and a second protrusion respectively extending along two opposite edges of the first portion in a direction away from the edges.

[0023] In a specific embodiment, the protective cover further includes a stop structure provided at one end of the second portion close to the first portion;

[0024] The stop structure is made of elastic material and includes a first component and a second component that are relatively arranged on two edges of the second part. The distance between the first component and the second component is smaller than the size of the limiting protrusion.

[0025] In a specific embodiment, a second passage groove is provided on the inner wall of the protective cover at one end away from the through hole, one end of the second passage groove is connected to the first part of the first passage groove, and the limiting protrusion can enter the first passage groove along the second passage groove.

[0026] In a specific embodiment, the number of the limiting protrusions, the first passage grooves, and the second passage grooves is two, and each of the limiting protrusions is used in conjunction with one of the first passage grooves and one of the second passage grooves.

[0027] In a specific embodiment, the two limiting protrusions are symmetrically arranged on the outer wall of the syringe, the two first passage grooves are symmetrically arranged on the side wall of the protective sleeve, and the two second passage grooves are symmetrically set on the inner wall of the protective sleeve away from the through hole.

[0028] In a specific embodiment, the syringe includes a first end and a second end that are oppositely disposed, the first end is provided with a first flange extending radially outward from the syringe, and the second end is provided with the needle;

[0029] A second flange extending outwardly in the radial direction of the protective sleeve is provided at one end of the protective sleeve away from the through hole.

[0030] In a specific embodiment, the elastic member includes a spring.

[0031] In a specific embodiment, at least one weight-reducing groove is further provided on the side wall of the protective cover.

[0032] In a specific embodiment, the length of the protective sleeve is shorter than the length of the syringe.

[0033] In a second aspect, corresponding to the above-mentioned syringe protection device, the present application further provides a safety syringe, comprising a syringe and a push rod that cooperate with each other, and also comprising the above-mentioned syringe protection device, wherein a limiting protrusion is provided on the outer wall of the syringe, and the protection device comprises at least a protective sleeve and an elastic member;

[0034] The protective sleeve is mounted on one end of the outer side of the syringe near the needle, a through hole is formed at one end of the protective sleeve, a first limiting hole and a second limiting hole are formed on the side wall of the protective sleeve, and the length of the protective sleeve is less than the length of the syringe;

[0035] The elastic member is sleeved on the syringe, and the syringe is press-fitted into the protective sleeve after the elastic member is sleeved on the syringe;

[0036] In the first state, the syringe is pressed into the protective sleeve, the limiting protrusion is locked in the first limiting hole, and the needle passes through the through hole and is exposed outside the protective sleeve;

[0037] In the second state, the limiting protrusion is locked in the second limiting hole, and the needle is covered inside the protective sleeve.

[0038] In a specific embodiment, the limiting protrusion is arranged on the outer wall of the syringe near one end of the through hole.

[0039] In a specific embodiment, the limiting protrusion is integrally formed with the outer wall of the syringe or the limiting protrusion is connected to the outer wall of the syringe.

[0040] The beneficial effects of the technical solution provided by the embodiments of the present application are:

[0041] The embodiment of the present application provides a syringe protection device and a safety syringe, wherein the syringe at least includes a syringe, a limiting protrusion is provided on the outer wall of the syringe, and the device at least includes a protective sleeve and an elastic member; the protective sleeve is sleeved on the end of the outer side of the syringe near the needle, a through hole is provided at one end of the protective sleeve, and a first limiting hole and a second limiting hole are provided on the side wall of the protective sleeve; the elastic member is sleeved on the syringe, and the syringe is pressed into the protective sleeve after being sleeved with the elastic member; in a first state, the syringe is pressed into the protective sleeve, the limiting protrusion is stuck in the first limiting hole, and the needle passes through the through hole and is exposed to the outside of the protective sleeve; in a second state, the limiting protrusion is stuck in the second limiting hole, and the needle is covered inside the protective sleeve. The syringe protection device provided by the present application, after the syringe is used, changes the position of the limiting protrusion so that the position of the syringe relative to the protective sleeve changes, allowing the needle to enter the inside of the protective sleeve through the through hole, thereby solving the problem of secondary injury to the person after the syringe injection is completed;

[0042] Furthermore, in the syringe protection device and safety syringe provided in the embodiments of the present application, the length of the protective sleeve is shorter than the length of the syringe barrel. Compared with the protective sleeve in the prior art, the structure is simpler, the amount of preparation materials is reduced, and it is more environmentally friendly and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] FIG1 is an exploded view of a syringe protection device provided in Example 1 of the present application;

[0045] FIG2 is a schematic structural diagram of the syringe protection device provided in Example 1 of the present application and the syringe in an unused state after the syringe is assembled;

[0046] FIG3 is a schematic structural diagram of the syringe protection device provided in Example 1 of the present application and the syringe after the syringe is assembled and in use;

[0047] FIG4 is a schematic structural diagram of the protective cover of the syringe protection device provided in Example 1 of the present application;

[0048] FIG5 is an exploded view of the safety syringe provided in Example 4 of the present application;

[0049] FIG6 is an exploded view of the syringe protection device provided in Example 2 of the present application;

[0050] FIG7 is a schematic structural diagram of the syringe protection device provided in Example 2 of the present application and the syringe in an unused state after the syringe is assembled;

[0051] FIG8 is a schematic structural diagram of the syringe protection device provided in Example 2 of the present application after the syringe is assembled with the syringe and the syringe is in use;

[0052] FIG9 is a schematic structural diagram of a protective cover of a syringe protection device provided in Example 2 of the present application;

[0053] FIG10 is an exploded view of the safety syringe provided in Example 5 of the present application;

[0054] FIG11 is an exploded view of the syringe protection device provided in Example 3 of the present application;

[0055] FIG12 is a schematic structural diagram of the syringe protection device provided in Example 3 of the present application and the syringe in an unused state after the syringe is assembled;

[0056] FIG13 is a schematic structural diagram of the syringe protection device provided in Example 3 of the present application and the syringe after the syringe is assembled and in use;

[0057] FIG14 is a schematic structural diagram of the protective cover of the syringe protection device provided in Example 3 of the present application;

[0058] FIG15 is an exploded view of the safety syringe provided in Example 6 of the present application. DETAILED DESCRIPTION

[0059] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0060] As described in the background art, existing integrated syringe protection devices are limited by the properties of molding materials and protection requirements, and most of them have problems such as large overall size, complex structure, large shell and spring materials, low environmental protection, high production cost, and inconvenient operation.

[0061] In order to solve one or more of the above problems, the embodiments of the present application creatively propose a new syringe protection device, which is mounted on the outside of the syringe when in use. The device is configured to change the position of the limiting protrusion after pressing the syringe push rod to the bottom when the syringe is in use, so that the position of the syringe relative to the protective sleeve changes, allowing the needle to enter the inside of the protective sleeve through the through hole, thereby solving the problem of secondary harm to people after the syringe injection is completed; furthermore, the length of the protective sleeve is shorter than the length of the syringe. Compared with the protective sleeve in the prior art, the structure is simpler, the amount of preparation materials is reduced, it is more environmentally friendly and saves costs.

[0062] The present embodiments do not specify the specific materials and preparation processes for the syringe protection device and safety syringe. Any known materials may be used in the present embodiments without violating the inventive concept of the present invention. As an illustrative, non-limiting illustration, the syringe protection device and safety syringe disclosed in the present embodiments can be prepared using 3D printing technology using a suitable polymer material. The specific preparation process is outside the scope of this application and will not be detailed here.

[0063] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0064] Example 1

[0065] The syringe protection device provided herein is mounted on the exterior of a syringe. After use, the device protects the needle and prevents secondary injury. Referring to Figures 1 to 4 , the syringe protection device generally comprises a protective sleeve 100 and an elastic member 200. The syringe used with the syringe protection device comprises at least a syringe barrel 300 and a push rod 400 that cooperate with each other. Preferably, the elastic member 200 is a spring. The protective sleeve 100 is designed to fit over the outer end of the syringe barrel 300, near the needle. A through hole 110 is defined at one end of the protective sleeve 100, and a first stopper hole 120 and a second stopper hole 130 are defined on the sidewall of the protective sleeve. Correspondingly, the outer wall of the syringe barrel 300 is provided with stopper bumps 310 that cooperate with the first stopper hole 120 and the second stopper hole 130. The elastic member 200 is mounted over the syringe barrel 300, and the syringe barrel 300 is press-fitted into the protective sleeve after being fitted with the elastic member 200.

[0066] 2 and 3 , in the first state, the syringe 300 is sleeved with the elastic member 200 and then press-fitted into the protective sleeve 100, with the limiting protrusion 310 locked in the first limiting hole 120. The needle tip passes through the through hole 110 and is exposed to the outside of the protective sleeve 100 for subsequent injection. In the second state, after the push rod 400 is pressed to the bottom, the limiting protrusion 310 moves from the first limiting hole 120 to the second limiting hole 130. At the same time, the limiting protrusion 310 is confined in the second limiting hole 130 under the thrust of the elastic member 200, and the needle tip enters the protective sleeve 100 through the through hole 110 to prevent the needle from causing secondary damage to the user. The first state includes but is not limited to the unused state of the syringe, and the second state includes but is not limited to the used state of the syringe.

[0067] In the embodiment of the present application, there is no specific limitation on the length of the protective sleeve. Without violating the inventive concept of the present application, the user can set it according to actual needs. For example, in a specific embodiment, the length of the protective sleeve is less than the length of the syringe. This can make the structure of the protective sleeve simpler, reduce the amount of preparation materials, be more environmentally friendly and save costs. In another specific embodiment, the length of the protective sleeve is not less than the length of the syringe. Preferably, the length of the protective sleeve is less than the length of the syringe but greater than the length of the needle, so that after the syringe is used, the needle can be completely covered inside the protective sleeve, thereby avoiding secondary damage to the person. It should be noted here that in the embodiment of the present application, there is no specific limitation on the shape of the protective sleeve 100. As an exemplary and non-restrictive explanation, the protective sleeve 100 is a hollow structure. Preferably, the protective sleeve 100 is a hollow cylinder. It can be understood that a storage space is formed inside the protective sleeve 100, and the storage space is used to accommodate the syringe and / or needle.

[0068] With further reference to Figures 1 to 4 , the first limiting hole 120 and the second limiting hole 130 are respectively located at different positions on the side wall of the protective cover 100. Specifically, the first limiting hole 120 is provided on the side wall of the protective cover 100 at one end close to the through hole 110, and the second limiting hole 130 is provided on the side wall of the protective cover 100 at one end away from the through hole. The position of the limiting protrusion 310 can be switched between the first limiting hole 120 and the second limiting hole 130. In the first state (such as the state in which the syringe is not in use), the syringe 300 is sleeved with the elastic member 200 and then press-fitted into the protective cover 100, and the needle passes through the through hole 110 and is exposed to the outside of the protective cover 100. At this time, the limiting protrusion 310 is located at the first limiting hole 120. In the second state (such as the state after the syringe is used), after pressing the push rod 400 to the bottom, the position of the limiting protrusion 310 is switched from the first limiting hole 120 to the second limiting hole 130. At the same time, under the thrust of the elastic member 200, the limiting protrusion 310 is restricted in the second limiting hole 130, and the needle enters the interior of the protective sleeve 100 through the through hole 110.

[0069] Referring to Figures 1 to 4, as a preferred embodiment, in the embodiment of the present application, a first passage groove 140 is further provided on the side wall of the protective cover 100, and the limiting protrusion 310 can move along the first passage groove 140. The size of the limiting protrusion 310 is adapted to the size of the first passage groove 140. Preferably, the size of the limiting protrusion 310 is slightly smaller than the size of the first passage groove 140 in a direction perpendicular to the moving direction of the limiting protrusion 310. It should be noted here that in the embodiment of the present application, there is no specific restriction on the shape of the limiting protrusion 310. Without violating the inventive concept of the present application, any known shape can be used as the shape of the limiting protrusion of the present application. As an exemplary and non-restrictive explanation, the limiting protrusion in the implementation of the present application is circular or cylindrical.

[0070] Further referring to Figure 4 , the first passageway 140 is defined on and extends through the sidewall of the protective cover 100. The first passageway 140 comprises at least a first portion 141, a second portion 142, and a third portion 143, which are interconnected. The second portion 142 is arranged axially along the protective cover 100, and both the first portion 141 and the third portion 143 are arranged at an angle relative to the second portion 142. The first limiting hole 120 is located at the end of the third portion 143 away from the second portion 142, and the second limiting hole 130 is located at the end of the first portion 141 away from the second portion 142. The limiting protrusion 310 is movable within the first passageway 140 and can move along the first passageway 140 to either the first limiting hole 120 or the first limiting hole 130. In the first state (e.g., when the syringe is not in use), the syringe barrel 300 is sleeved with the elastic member 200 and press-fitted into the protective sleeve 100. The limiting protrusion 310 is located at the first limiting hole 120 in the first passage groove 140. At this time, the needle tip can pass through the through hole 110 and be exposed outside the protective sleeve 100. In the second state (e.g., when the syringe is in use), after the push rod 400 is pressed to the bottom, the position of the limiting protrusion 310 is switched from the first limiting hole 120 to the second limiting hole 130. At the same time, under the thrust of the elastic member 200, the limiting protrusion 310 is confined in the second limiting hole 130. At this time, the needle tip enters the protective sleeve 100 through the through hole 110 and is completely covered by the protective sleeve 100.

[0071] As an exemplary and non-limiting description, the angle between the first portion 141 and the second portion 142 is in the range of (0, 180 degrees), and the angle between the third portion 143 and the second portion 142 is in the range of (0 degrees). For example, the angle between the first portion 141 and the second portion 142 is an obtuse angle, and the angle between the third portion 143 and the second portion 142 is an acute angle.

[0072] In order to facilitate the assembly of the syringe 300 in the protective sleeve 100, further referring to the figure, in an embodiment of the present application, a second passage groove 160 is further provided on the inner wall of the end of the protective sleeve 100 away from the through hole 110, and an opening is provided at the end of the second passage groove 160 away from the first part 141, so that the end of the second passage groove 160 away from the first part 141 is connected to the outside of the protective sleeve 100, and the end of the second passage groove 160 close to the first part 141 is connected to the first part 141, so that the limiting protrusion 310 can enter the second passage groove 160 through the opening and can enter the first passage groove 140 along the second passage groove 160.

[0073] Preferably, the second passage groove 160 is arranged at an end of the first part 141 away from the second part 141, and the second passage groove 160 is arranged at an angle to the first part 141 to prevent the limiting protrusion 310 from rushing out of the second passage groove due to the thrust of the elastic member after the syringe is used, thereby causing the syringe to rush out from the inside of the protective cover 100 and causing the syringe to fall off from the protective cover.

[0074] It should be noted that the specific shape of the second passageway 160 is not limited in this embodiment of the present application and can be configured by the user according to actual needs. This is provided as an example and not as a limitation. The second passageway 160 in this embodiment of the present application can be rectangular, L-shaped, Z-shaped, etc., and these are not listed here one by one.

[0075] As a preferred embodiment, in the embodiment of the present application, the number of the limiting protrusions 310 can be one or more. Preferably, the number of the limiting protrusions 310 can be set to two. Correspondingly, the number of the first passage grooves 140 and the second passage grooves 160 also includes two, and each limiting protrusion is used in conjunction with one of the first passage grooves 140 and one of the second passage grooves 160. Further preferably, the two limiting protrusions 310 are symmetrically arranged on the outer wall of the syringe 300, the two first passage grooves 140 are symmetrically arranged on the side wall of the protective cover 100, and the two second passage grooves 160 are symmetrically arranged on the inner wall of the protective cover 100 away from the through hole 110. It can be understood that arranging the limiting protrusions 310 and other components in a symmetrical arrangement is conducive to smoother movement of the limiting protrusions 310 in the first passage grooves 140 and the second passage grooves 160, avoiding jamming.

[0076] It will be appreciated that the syringe 300 includes a first end and a second end disposed opposite each other, with the first end being provided with a first flange 320 and the second end being provided with a needle 330. Specifically, the first flange 320 is formed extending radially outward from the first end of the syringe 300. The provision of the first flange 320 provides a gripping point when the plunger is pushed downward during use of the syringe, facilitating downward movement of the plunger.

[0077] Correspondingly, as a preferred embodiment, in the embodiment of the present application, a second flange 170 is provided at one end of the protective cover 100 away from the through hole 110 and extending radially outward from the protective cover 100. As an example, the second flange 170 is an annular structure that surrounds the end of the protective cover 100 away from the through hole 110.

[0078] In order to reduce the amount of materials used in making the protective cover and reduce costs, in an embodiment of the present application, at least one weight-reducing groove (not shown) is further provided on the protective cover. Further referring to FIG4 , the weight-reducing groove is provided on the side wall of the protective cover and passes through the side wall of the protective cover. The number, size and shape of the weight-reducing grooves are not specifically limited in this application, and users can set them according to actual needs. Further referring to FIG4 , as an exemplary and non-restrictive explanation, in an embodiment of the present application, the number of weight-reducing grooves can be two, and the two weight-reducing grooves are arranged relatively on the side wall of the protective cover, and the shape of the weight-reducing groove can be any regular shape or any irregular shape such as a rectangle, a circle, a triangle, a trapezoid, a rhombus, etc.

[0079] Example 2

[0080] The difference from the first embodiment is that, as shown in Figures 6 to 9, in this embodiment, the first passage groove 140' includes at least a first portion 141', a second portion 142', and a third portion 143' that are interconnected. The second portion 142' is still arranged along the axial direction of the protective cover 100, and the first portion 141' and the third portion 143' are both arranged at an angle to the second portion 142'. For example, the first portion 141' and the second portion 142' are arranged perpendicular to each other, and the angle between the third portion 143' and the second portion 142' is an acute angle.

[0081] The first limiting hole 120 is located at the end of the third portion 143′ away from the second portion 142′, and the second limiting hole 130 is located at the end of the second portion 142′ closer to the first portion 141′. The limiting protrusion 310 can move within the first passage groove 140′ and can move along the first passage groove 140′ to the first limiting hole 120 or the second limiting hole 130. In the first state (such as the syringe is not in use), the syringe 300 is sleeved with the elastic member 200 and press-fitted into the protective sleeve 100. The limiting protrusion 310 is located at the first limiting hole 120. At this time, the needle tip can pass through the through hole 110 and be exposed outside the protective sleeve 100. In the second state (e.g., the state after the syringe is used), after pressing the push rod 400 to the bottom, the position of the limiting protrusion 310 is pressed down from the first limiting hole 120 to the third portion 143″. The syringe is pushed back under the thrust of the elastic member 200, and the limiting protrusion 310 moves to the second limiting hole 130. At the same time, under the thrust of the elastic member 200, the limiting protrusion 310 is confined in the second limiting hole 130. At this time, the needle enters the protective cover 100 through the through hole 110 and is completely covered by the protective cover 100.

[0082] As a preferred embodiment, in the embodiment of the present application, the protective cover 100 further includes a stop structure 150. As further shown in Figure 9, the stop structure 150 is provided at one end of the first part 141' close to the second part 142'. In specific implementation, the stop structure 150 can be composed of two parts, a first protrusion 151 and a second protrusion 152. The first protrusion 151 and the second protrusion 152 are respectively provided on two opposite edges of the first part 141'. The first protrusion 151 is formed by extending along the edge of the first part 141' away from the through hole in a direction away from the edge, and the second protrusion 152 is formed by extending along the edge of the first part 141' close to the through hole in a direction away from the edge. Preferably, the first protrusion 151 and the second protrusion 152 are made of elastic material, and the distance between the first protrusion 151 and the second protrusion 152 is slightly smaller than the size of the limiting protrusion 310, so that when the limiting protrusion 310 enters the second part 142′ from the first part 141′, the first protrusion 151 and the second protrusion 152 can be deformed by applying a certain extrusion force, so that the limiting protrusion 310 can enter the second part 142′ from the first part 141′. Conversely, when the syringe is in use, the limiting protrusion 310 is switched from the first limiting hole 120 to the second limiting hole 130. When the syringe is pushed out of the inside of the protective cover 100 by the thrust of the elastic member 200, the limiting protrusion 310 can be prevented from entering the second passage groove through the first part due to the obstruction of the stop mechanism 150, thereby preventing the syringe from falling off from the second part and the protective cover 100. It should be noted here that the embodiment of the present application does not specifically limit the size and shape of the stop structure 150, and the user can set it according to actual needs.

[0083] 9 , in the embodiment of the present application, a second flange 170 ′ is formed at an end of the protective cover 100 away from the through hole 110 and extends radially outward from the protective cover 100. There are two second flanges 170 ′, which are disposed opposite each other at the end of the protective cover 100 away from the through hole 110.

[0084] Example 3

[0085] The difference from the second embodiment is that, as shown in Figures 11 to 14, in the embodiment of the present application, the first passage groove 140" includes at least a first portion 141", a second portion 142" and a third portion 143" that are interconnected, wherein the second portion 142" is still arranged along the axial direction of the protective cover 100, and the first portion 141" and the third portion 143" are both arranged at an angle to the second portion 142". Exemplarily, the first portion 141" and the second portion 142" are arranged perpendicular to each other, and the angle between the third portion 143" and the second portion 142" is an acute angle.

[0086] The first limiting hole 120 is located at one end of the third portion 143″ away from the second portion 142″, and the second limiting hole 130 is located at one end of the second portion 142″ close to the first portion 141″. The limiting protrusion 310 can move in the first passage groove 140″ and can move along the first passage groove 140″ to the first limiting hole 120 or the second limiting hole 130. In the first state (such as the syringe is not in use), the syringe 300 is pressed into the protective cover 100 after being sleeved with the elastic part 200, and the limiting protrusion 310 is located at the first limiting hole 120. At this time, the needle tip can pass through the through hole 110 and be exposed to the outside of the protective cover 100. In the second state (e.g., the state after the syringe is used), after the push rod 400 is pressed to the bottom, the position of the limiting protrusion 310 is pressed down from the first limiting hole 120 to the third portion 143", and the syringe is pushed back under the thrust of the elastic member 200, and the limiting protrusion 310 moves to the second limiting hole 130. At this time, the needle enters the protective cover 100 through the through hole 110 and is completely covered by the protective cover 100.

[0087] As a preferred embodiment, in the embodiment of the present application, the protective cover 100 also includes a stop structure 150'. As further shown in Figure 11, the stop structure 150' is arranged at one end of the second part 142" close to the first part 141". The stop structure 150' includes a first component 151' and a second component 152' relatively arranged on two edges of the second part 142". The distance between the first component 151' and the second component 152' is less than the size of the limiting protrusion 310. In specific implementation, the first component 151' and the second component 152' are respectively extended along the two edges of the second part 142" to the inside of the groove body of the first passage groove, and the first component 151' and the second component 152' form a certain angle with the edges where they are respectively located, and the value range of the angle is (0, 180°). Preferably, the stop structure 150' is an elastic material, that is, the material of the first component 151' and the second component 152' is an elastic material. With such a configuration, in the second state (e.g., the state after the syringe is used), after the push rod 400 is pressed to the bottom, the position of the limiting protrusion 310 is pressed down from the first limiting hole 120 to the third part 143", and the syringe is pushed back under the thrust of the elastic member 200. The limiting protrusion 310 moves in the opposite direction along the first passage groove. When it reaches the stop structure 150', the first part 151' and the second part 152' of the stop structure 150' are squeezed by inertia, causing the first part 151' and the second part 152' to deform, so that the limiting protrusion 310 rushes over the stop When the structure 150′ enters the second limiting hole 130, the first part 151′ and the second part 152′ return to their original state due to the disappearance of the squeezing force. Since the distance between the first part 151′ and the second part 152′ is smaller than the size of the limiting protrusion 310, the limiting protrusion 310 is confined to the second limiting hole 130, preventing the syringe from falling back and exposing the needle tip to the outside of the protective cover, causing secondary injury to the user. It is understood that as a preferred embodiment, in the embodiment of the present application, the stop structure 150′ is integrally formed with the protective cover 100.

[0088] As an optional embodiment, the stopping structure 150 ′ is an independent component, which is assembled on the protective cover 100 .

[0089] Example 4

[0090] Corresponding to the syringe protection device provided in the first embodiment above, the present embodiment provides a safety syringe. Referring to FIG5 , the safety syringe includes a syringe barrel 300 and a push rod 400 that cooperate with each other, as well as the syringe protection device described above. The syringe protection device includes a protective sleeve 100 and an elastic member 200. A through hole 110 is formed at one end of the protective sleeve 100, and a first limiting hole 120 and a second limiting hole 130 are formed on the side wall of the protective sleeve. Correspondingly, a limiting protrusion 310 is provided on the outer wall of the syringe barrel 300 for use with the first limiting hole 120 and the second limiting hole 130. For details regarding the syringe protection device, please refer to the details in the first embodiment and will not be elaborated on here.

[0091] With further reference to Figures 2 and 3, in a first state (such as when the syringe is not in use), the syringe barrel 300 is sleeved with the elastic member 200 and then pressed into the protective sleeve 100, the limiting protrusion 310 is clamped in the first limiting hole 120, and the needle is exposed to the outside of the protective sleeve 100 through the through hole 110 for subsequent injection; in a second state (such as when the syringe is in use), after pressing the push rod 400 to the bottom, the limiting protrusion 310 is moved from the first limiting hole 120 to the second limiting hole 130, and at the same time, under the thrust of the elastic member 200, the limiting protrusion 310 is restricted in the second limiting hole 130, and the needle enters the interior of the protective sleeve 100 through the through hole 110 to avoid secondary injury to the person caused by the needle.

[0092] 5 , the syringe 300 generally includes a stopper 310, a first flange 320, a needle 330, a needle holder 340, a liquid inlet 350, a needle cap 360, and a barrel 370. The stopper 310 is disposed on the sidewall of the barrel 370. Preferably, the stopper 310 is disposed on one end of the barrel 370 near the through hole 110, and the stopper 310 is movable along the first passage 140. A storage space is formed within the barrel 370 for storing the medicinal solution to be injected. The needle holder 340 and the liquid inlet 350 are disposed at opposite ends of the barrel 370 and are both connected to the storage space within the barrel 370. The needle 330 is disposed within the needle holder 340 and is connected to the storage space within the barrel 370 for subsequent injection of the medicinal solution. The needle cap 360 is mounted on the outside of the needle 330 to protect the needle 330 from contamination and to protect relevant personnel from being pricked by the needle.

[0093] As an optional implementation, in the embodiment of the present application, the limiting protrusion is integrally formed with the outer wall of the syringe.

[0094] As another optional embodiment, in the embodiment of the present application, the limiting protrusion is connected to the outer wall of the syringe, wherein the present application does not limit the specific connection method between the limiting protrusion and the outer wall of the syringe. As an example, the limiting protrusion and the outer wall of the syringe can be connected by pasting, gluing, etc.

[0095] With further reference to Figure 5, push rod 400 includes a push-twist cap 410, a connecting rod 420 and a seal 430. The push-twist cap 410 and the seal 430 are respectively connected to the opposite ends of the connecting rod 420. The push-twist cap 410 is used to provide a force application point to relevant personnel when the syringe is in use. The seal 430 is interference fit with the syringe to prevent the syringe from leaking. Preferably, the push-twist cap 410 and the connecting rod 420 are made of the same material, and the seal 430 is made of an elastic material. Further preferably, the push-twist cap 410 and the connecting rod 420 are integrally formed, and the seal 430 and the connecting rod 420 are threadedly connected. Exemplarily, the seal 430 is provided with an internal thread, and one end of the connecting rod 420 connected to the seal 430 is provided with an external thread matching the internal thread, and the seal 430 and the connecting rod 420 are threadedly connected by the internal thread and the external thread.

[0096] When assembling the safety syringe, first, the elastic member 200 is placed in the protective cover 100, and the syringe barrel 300 is passed through the protective cover 100 and the elastic member 200. Specifically, the needle fixing member 330 and the needle 330 of the syringe barrel 300 pass through the elastic member 200, and the needle fixing member 340 and the needle 330 are inserted through the through hole 110 opened at the bottom of the protective cover 100 and exposed to the outside of the protective cover 100. The limiting protrusion 310 is inserted from the second through hole opened on the protective cover 100. The needle 330 is sealed by the elastic member 200. After the syringe 300 and the protective cover 100 are pushed apart, the syringe 300 is restrained by the elastic member 200. The needle cap 360 is placed on the needle head 330 to form a seal. After the liquid is poured into the liquid inlet 350 at the top of the syringe 300, the connecting rod 420 of the push rod 400 is connected to the sealing member 430 by a screw thread and then inserted into the syringe 300 to form the entire safety syringe (i.e., the syringe in the unused state).

[0097] When the safety syringe is in use, the needle cap 360 is removed from the needle 330, and the push-twist cap 410 is pressed downward to squeeze the liquid medicine. After the liquid medicine is injected, the position of the limiting protrusion 310 is moved out of the first limiting hole 120, and the elastic member 200 rebounds the syringe 300 in the opposite direction, and the limiting protrusion 310 is moved to the second limiting hole 130 through the third part 143, the second part 142 and the first part 141 of the first passage groove 140 in sequence. The needle 330 enters the protective cover 100 through the through hole 110 and is covered by the protective cover 100. The use state is completed. At the same time, the reverse thrust of the elastic member 200 locks the limiting protrusion 310 at the second limiting hole 130, making the syringe 300 and the protective cover 100 unable to move to expose the needle 330, thereby playing a protective role and avoiding secondary injury to people.

[0098] Example 5

[0099] Corresponding to the syringe protection device provided in the second embodiment above, the present embodiment provides a safety syringe. Referring to FIG10 , the safety syringe includes a syringe barrel 300 and a push rod 400 that cooperate with each other, as well as the syringe protection device described above. The syringe protection device includes a protective sleeve 100 and an elastic member 200. A through hole 110 is formed at one end of the protective sleeve 100, and a first limiting hole 120 and a second limiting hole 130 are formed on the side wall of the protective sleeve. Correspondingly, a limiting protrusion 310 is provided on the outer wall of the syringe barrel 300 for use with the first limiting hole 120 and the second limiting hole 130. For details regarding the syringe protection device, please refer to the details in the first embodiment and will not be elaborated on here.

[0100] With further reference to Figures 7 and 8, in a first state (such as when the syringe is not in use), the syringe barrel 300 is sleeved with the elastic member 200 and then pressed into the protective sleeve 100, the limiting protrusion 310 is clamped in the first limiting hole 120, and the needle is exposed to the outside of the protective sleeve 100 through the through hole 110 for subsequent injection; in a second state (such as when the syringe is in use), after pressing the push rod 400 to the bottom, the limiting protrusion 310 is moved from the first limiting hole 120 to the second limiting hole 130, and at the same time, under the thrust of the elastic member 200, the limiting protrusion 310 is restricted in the second limiting hole 130, and the needle enters the interior of the protective sleeve 100 through the through hole 110 to avoid secondary injury to the person caused by the needle.

[0101] 5 , the syringe 300 generally includes a stopper 310, a first flange 320, a needle 330, a needle holder 340, a liquid inlet 350, a needle cap 360, and a barrel 370. The stopper 310 is disposed on the sidewall of the barrel 370. Preferably, the stopper 310 is disposed on one end of the barrel 370 near the through hole 110 and is movable along the first passage 140′. A storage space is formed within the barrel 370 for storing the medicinal solution to be injected. The needle holder 340 and the liquid inlet 350 are disposed at opposite ends of the barrel 370 and are both connected to the storage space within the barrel 370. The needle 330 is disposed within the needle holder 340 and is connected to the storage space within the barrel 370 for subsequent injection of the medicinal solution. The needle cap 360 is mounted on the outside of the needle 330 to protect the needle 330 from contamination and to protect relevant personnel from being pricked by the needle.

[0102] As an optional implementation, in the embodiment of the present application, the limiting protrusion is integrally formed with the outer wall of the syringe.

[0103] As another optional embodiment, in the embodiment of the present application, the limiting protrusion is connected to the outer wall of the syringe, wherein the present application does not limit the specific connection method between the limiting protrusion and the outer wall of the syringe. As an example, the limiting protrusion and the outer wall of the syringe can be connected by pasting, gluing, etc.

[0104] With further reference to Figure 10, push rod 400 includes a push-twist cap 410, a connecting rod 420 and a sealing member 430. The push-twist cap 410 and the sealing member 430 are respectively connected to opposite ends of the connecting rod 420. The push-twist cap 410 is used to provide a force application point to relevant personnel when the syringe is in use. The sealing member 430 is interference fit with the syringe to prevent the syringe from leaking. Preferably, the push-twist cap 410 and the connecting rod 420 are made of the same material, and the sealing member 430 is made of an elastic material. Further preferably, the push-twist cap 410 and the connecting rod 420 are integrally formed, and the sealing member 430 and the connecting rod 420 are threadedly connected. Exemplarily, the sealing member 430 is provided with an internal thread, and one end of the connecting rod 420 connected to the sealing member 430 is provided with an external thread matching the internal thread, and the sealing member 430 and the connecting rod 420 are threadedly connected through the internal thread and the external thread.

[0105] When assembling the safety syringe, first place the elastic member 200 in the protective cover 100, and insert the syringe barrel 300 as a whole through the protective cover 100 and the elastic member 200. Specifically, the needle fixing member 330 and the needle 330 of the syringe barrel 300 pass through the elastic member 200, and the needle fixing member 340 and the needle 330 are inserted through the through hole 110 opened at the bottom of the protective cover 100 and exposed to the outside of the protective cover 100. The limiting protrusion 310 enters the second passage groove 160 opened on the protective cover 100. The first portion 141′ of the first passage 140′ is squeezed from the first portion 141′ through the stop structure 150 into the second portion 142′, and then enters the third portion 143′ through the second portion 142′ until it moves to the first limiting hole 120. At this time, the elastic member 200 forms an elastic force under the squeezing of the syringe 300 and the protective sleeve 100, and snaps the limiting protrusion 310 into the first limiting hole 120, thereby restricting the syringe 300 and preventing the syringe 300 and the protective sleeve 100 from being bounced apart by the elastic member 200. The needle cap 360 is placed on the needle head 330 to form a seal. After the liquid medicine is poured into the liquid inlet 350 at the top of the syringe 300, the connecting rod 420 of the push rod 400 is connected to the sealing member 430 through a screw, and then inserted into the syringe 300 to form the entire safety syringe (i.e., the syringe in the unused state).

[0106] When the safety syringe is in use, the needle cap 360 is removed from the needle 330, and the push-twist cap 410 is pressed downward to squeeze the liquid medicine. After the liquid medicine is injected, the position of the limiting protrusion 310 is moved out of the first limiting hole 120, and the elastic member 200 rebounds the syringe 300 in the opposite direction, and the limiting protrusion 310 is moved to the second limiting hole 130 through the third part 143' and the second part 142' of the first passage groove 140 in sequence. The needle 330 enters the protective cover 100 through the through hole 110 and is covered by the protective cover 100. The use state is completed. At the same time, the reverse thrust of the elastic member 200 locks the limiting protrusion 310 at the second limiting hole 130, making the syringe 300 and the protective cover 100 unable to move to expose the needle 330, thereby playing a protective role and avoiding secondary injury to people.

[0107] Example 6

[0108] Corresponding to the syringe protection device provided in the third embodiment above, the present embodiment provides a safety syringe. Referring to FIG15 , the safety syringe includes a syringe barrel 300 and a push rod 400 that cooperate with each other, as well as the syringe protection device described in the third embodiment. The syringe protection device includes a protective sleeve 100 and an elastic member 200. The protective sleeve 100 has a through hole 110 at one end, and a first limiting hole 120 and a second limiting hole 130 are formed on the side wall of the protective sleeve. Correspondingly, the outer wall of the syringe barrel 300 is provided with a limiting protrusion 310 that cooperates with the first limiting hole 120 and the second limiting hole 130. For details about the syringe protection device, please refer to the content of the first embodiment and will not be repeated here.

[0109] 12 and 13 , in a first state (e.g., the syringe is not in use), the syringe 300 is sleeved with the elastic member 200 and then press-fitted into the protective sleeve 100, the limiting protrusion 310 is clamped in the first limiting hole 120, and the needle tip passes through the through hole 110 and is exposed to the outside of the protective sleeve 100 for subsequent injection use; in a second state (e.g., the syringe is in use), the limiting protrusion 310 is pressed down from the first limiting hole 120 to the third portion 143″, the syringe is pushed back under the thrust of the elastic member 200, and the limiting protrusion 310 moves in the opposite direction along the first passage groove. When it reaches the stop structure 150′ Due to inertia squeezing the first part 151′ and the second part 152′ of the stop structure 150′, the first part 151′ and the second part 152′ are deformed, so that the limiting protrusion 310 rushes through the stop structure 150′ and enters the second limiting hole 130. The first part 151′ and the second part 152′ return to their original state due to the disappearance of the squeezing force. Since the distance between the first part 151′ and the second part 152′ is smaller than the size of the limiting protrusion 310, the limiting protrusion 310 is restricted to the second limiting hole 130, preventing the syringe from falling back and causing the needle to be exposed outside the protective cover, causing secondary injury to the user.

[0110] 15 , the syringe 300 generally includes a stopper protrusion 310 , a first flange 320 , a needle 330 , a needle fixing member 340 , a liquid inlet 350 , a needle cap 360 and a barrel 370 . The limiting protrusion 310 is provided on the side wall of the barrel 370. Preferably, the limiting protrusion 310 is provided on one end of the side wall of the barrel 370 near the through hole 110. The limiting protrusion 310 can move along the first passage groove 140". A storage space is formed inside the barrel 370 for storing the liquid medicine to be injected. The needle fixing member 340 and the liquid inlet 350 are respectively provided at opposite ends of the barrel 370 and are both connected to the storage space inside the barrel 370. The needle 330 is provided in the needle fixing member 340 and is connected to the storage space inside the barrel 370 for subsequent injection of the liquid medicine. The needle cap 360 is sleeved on the outside of the needle 330 to protect the needle 330 from contamination and protect relevant personnel from being pricked by the needle.

[0111] As an optional implementation, in the embodiment of the present application, the limiting protrusion is integrally formed with the outer wall of the syringe.

[0112] As another optional embodiment, in the embodiment of the present application, the limiting protrusion is connected to the outer wall of the syringe, wherein the present application does not limit the specific connection method between the limiting protrusion and the outer wall of the syringe. As an example, the limiting protrusion and the outer wall of the syringe can be connected by pasting, gluing, etc.

[0113] With further reference to Figure 15, push rod 400 includes a push-twist cap 410, a connecting rod 420 and a sealing member 430. The push-twist cap 410 and the sealing member 430 are respectively connected to opposite ends of the connecting rod 420. The push-twist cap 410 is used to provide a force application point to relevant personnel when the syringe is in use. The sealing member 430 is interference fit with the syringe to prevent the syringe from leaking. Preferably, the push-twist cap 410 and the connecting rod 420 are made of the same material, and the sealing member 430 is made of an elastic material. Further preferably, the push-twist cap 410 and the connecting rod 420 are integrally formed, and the sealing member 430 and the connecting rod 420 are threadedly connected. Exemplarily, the sealing member 430 is provided with an internal thread, and one end of the connecting rod 420 connected to the sealing member 430 is provided with an external thread matching the internal thread, and the sealing member 430 and the connecting rod 420 are threadedly connected by the internal thread and the external thread.

[0114] When assembling the safety syringe, first place the elastic member 200 in the protective cover 100, and then insert the syringe barrel 300 through the protective cover 100 and the elastic member 200. Specifically, the needle fixing member 330 and the needle 330 of the syringe barrel 300 pass through the elastic member 200, and the needle fixing member 340 and the needle 330 are inserted through the through hole 110 opened at the bottom of the protective cover 100 and exposed to the outside of the protective cover 100. The limiting protrusion 310 passes through the second passage groove opened on the protective cover 100. 160, enters the first part 141" of the first passage groove 140", enters the second part 142" from the first part 141", enters the third part 143" through the second part 142", until it moves to the first limiting hole 120. At this time, the elastic member 200 forms an elastic force under the squeezing of the syringe 300 and the protective sleeve 100, and snaps the limiting protrusion 310 at the first limiting hole 120, thereby restricting the syringe 300 to prevent the syringe 300 and the protective sleeve 100 from being bounced apart by the elastic member 200. Cover the needle cap 360 on the needle head 330 to form a seal. After the liquid medicine is poured into the liquid inlet 350 at the top of the syringe 300, the connecting rod 420 of the push rod 400 is connected to the sealing member 430 through a screw, and then inserted into the syringe 300 to form the whole of the safety syringe (that is, the syringe in the unused state).

[0115] When the safety syringe is used, the needle cap 360 is removed from the needle head 330, and the push-twist cap 410 is pressed downward to squeeze the liquid medicine. After the liquid medicine is injected, the position of the limiting protrusion 310 is pressed down from the first limiting hole 120 to the third part 143". The syringe is pushed back under the thrust of the elastic member 200. The limiting protrusion 310 moves in the opposite direction along the first passage groove. When it reaches the stop structure 150', the first part 151' and the second part 152' of the stop structure 150' are squeezed by inertia, so that the first part 1 51′ and the second part 152′ are deformed, so that the limiting protrusion 310 rushes through the stop structure 150′ and enters the second limiting hole 130, and the first part 151′ and the second part 152′ return to their original state due to the disappearance of the extrusion force. Since the distance between the first part 151′ and the second part 152′ is smaller than the size of the limiting protrusion 310, the limiting protrusion 310 is restricted to the second limiting hole 130, preventing the syringe from falling back and causing the needle to be exposed outside the protective cover, causing secondary injury to the user.

[0116] In the description of the present application, it should be understood that the terms "vertical", "parallel", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0117] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0118] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A syringe protection device, wherein the syringe comprises at least a syringe barrel, characterized in that: A limiting convex point is arranged on the outer wall of the syringe, and the device at least comprises a protective sleeve and an elastic member; The protective sleeve is sleeved on one end of the outer side of the syringe close to the needle, a through hole is opened at one end of the protective sleeve, and a first limiting hole and a second limiting hole are opened on the side wall of the protective sleeve; The elastic member is sleeved on the syringe, and the syringe is pressed into the protective sleeve after the elastic member is sleeved on the syringe; In the first state, the syringe is pressed into the protective sleeve, the limiting protrusion is clamped in the first limiting hole, and the needle passes through the through hole and is exposed outside the protective sleeve; In the second state, the limiting protrusion is locked in the second limiting hole, and the needle is covered inside the protective cover.

2. The syringe protection device according to claim 1, characterized in that: The first limiting hole is arranged on an end of the side wall of the protective cover close to the through hole, and the second limiting hole is arranged on an end of the side wall of the protective cover away from the through hole.

3. The syringe protection device according to claim 2, characterized in that: A first passage groove is also formed on the side wall of the protective cover, and the first passage groove is connected to the first limiting hole and the second limiting hole. The limiting protrusion can move along the first passage groove to the first limiting hole or the second limiting hole.

4. The syringe protection device according to claim 3, characterized in that: The first passage groove at least comprises a first part, a second part and a third part which are interconnected, the second part is arranged along the axial direction of the protective sleeve, and the first part and the third part are arranged at an angle to the second part; The first limiting hole is located at an end of the third portion away from the second portion, and the second limiting hole is located at an end of the first portion away from the second portion.

5. The syringe protection device according to claim 3, characterized in that: The first passage groove at least comprises a first part, a second part and a third part which are interconnected, the second part is arranged along the axial direction of the protective sleeve, and the first part and the third part are arranged at an angle to the second part; The first limiting hole is located at an end of the third portion away from the second portion, and the second limiting hole is located at an end of the second portion close to the first portion.

6. The syringe protection device according to claim 5, characterized in that: The protective cover further comprises a stop structure arranged at one end of the first part close to the second part; The stop structure includes a first protrusion and a second protrusion respectively extending along two opposite edges of the first portion in a direction away from the edges.

7. The syringe protection device according to claim 5, characterized in that: The protective cover further comprises a stop structure arranged at one end of the second part close to the first part; The stop structure is made of elastic material and includes a first component and a second component which are relatively arranged on two edges of the second part, and a distance between the first component and the second component is smaller than a size of the limiting protrusion.

8. The syringe protection device according to any one of claims 4 to 7, characterized in that: A second passage groove is provided on the inner wall of one end of the protective cover away from the through hole, one end of the second passage groove is connected with the first part of the first passage groove, and the limiting protrusion can enter the first passage groove along the second passage groove.

9. The syringe protection device according to claim 8, characterized in that: The number of the limiting protrusions, the first passage grooves and the second passage grooves is two, and each of the limiting protrusions is used in conjunction with one of the first passage grooves and one of the second passage grooves.

10. The syringe protection device according to claim 9, characterized in that: The two limiting protrusions are symmetrically arranged on the outer wall of the syringe, the two first passage grooves are symmetrically arranged on the side wall of the protective sleeve, and the two second passage grooves are symmetrically arranged on the inner wall of the protective sleeve at one end away from the through hole.

11. The syringe protection device according to any one of claims 1 to 7, characterized in that: The syringe comprises a first end and a second end which are arranged opposite to each other, the first end is provided with a first flange extending radially outward from the syringe, and the second end is provided with the needle; A second flange extending outwardly in the radial direction of the protective sleeve is disposed at one end of the protective sleeve away from the through hole.

12. The syringe protection device according to any one of claims 1 to 7, characterized in that: The elastic member includes a spring.

13. The syringe protection device according to any one of claims 1 to 7, characterized in that: At least one weight-reducing groove is also provided on the side wall of the protective cover.

14. The syringe protection device according to any one of claims 1 to 7, characterized in that: The length of the protective sleeve is shorter than the length of the syringe.

15. A safety syringe, comprising a syringe and a push rod that cooperate with each other, characterized in that: It also includes the syringe protection device according to any one of claims 1 to 14, wherein a limit point is provided on the outer wall of the syringe, and the protection device at least includes a protective sleeve and an elastic member; The protective sleeve is sleeved on one end of the outer side of the syringe near the needle, a through hole is opened at one end of the protective sleeve, a first limiting hole and a second limiting hole are opened on the side wall of the protective sleeve, and the length of the protective sleeve is less than the length of the syringe; The elastic member is sleeved on the syringe, and the syringe is pressed into the protective sleeve after the elastic member is sleeved on the syringe; In the first state, the syringe is pressed into the protective sleeve, the limiting protrusion is clamped in the first limiting hole, and the needle passes through the through hole and is exposed outside the protective sleeve; In the second state, the limiting protrusion is locked in the second limiting hole, and the needle is covered inside the protective cover.

16. The safety syringe according to claim 15, characterized in that: The limiting protrusion is arranged on the outer wall of the syringe close to one end of the through hole.

17. The syringe protection device according to claim 15, characterized in that: The limiting protrusion is integrally formed with the outer wall of the syringe or the limiting protrusion is connected to the outer wall of the syringe.

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