WO2022232978A1

WO2022232978A1 - Needlestick prevention syringe

Info

Publication number: WO2022232978A1
Application number: PCT/CN2021/091851
Authority: WO
Inventors: 毛春元; 毛亚凌
Original assignee: 上海金塔医用器材有限公司
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-11-10

Abstract

A needlestick prevention syringe (100), comprising a barrel (110), a needle (3), and a needle base (2). The interior of the barrel (110) is an injection cavity (120); the needle base (2) is mounted at the front end of the barrel (110); a rotatable sheath (4) is rotatably connected to the outer side of the needle base (2); the rotatable sheath (4) is rotated to the side close to the barrel (110) at an open position, and is rotated to the needle (3) at a protection position to protect the needle (3) in the rotatable sheath (4); the tail end of the needle (3) passes through the needle base (2) and continuously extends to the injection cavity (120) to be communicated with the injection cavity (120). According to the needlestick prevention syringe (100), the needle (3) is configured to pass through the needle base (2), and the needle (3) is directly communicated with the injection cavity (120) during injection; thus, drug residue in the barrel (110) is reduced and the dosage can be accurately controlled.

Description

Anti-needle stick syringe

technical field

The invention relates to an anti-needle-stick syringe.

Background technique

At present, in view of the sanitation requirements in some areas, the commonly used non-disposable syringes need to be covered with a needle cover to protect the needle after use. Because the needle is very thin and the diameter of the needle cover is not large, it is easy to stab the fingers and cause medical problems. Serious consequences such as human infection.

In view of this defect, some existing syringes use a needle with its own protective sheath, which is mounted on the barrel through a needle seat. After the injection is complete, slide the protective cover over the needle hub out and shield the needle. In this way, although the needle can be effectively protected and the medical staff can be prevented from being stabbed, when a small dose of medicine is injected, there is a lot of residual medicine at the front end of the syringe with its own protective sleeve and needle seat, which cannot accurately control the dose, which is not effective for treatment. The effect is huge.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an anti-needle-stick syringe in order to overcome the defect of the prior art that when a small dose of medicine is injected, there are many residual medicines at the front end of the needle seat and the syringe barrel, and the dosage cannot be accurately controlled.

The present invention solves the above-mentioned technical problems through the following technical solutions:

An anti-needle-stick syringe, comprising a needle barrel, a needle head and a needle seat, the inside of the barrel is an injection cavity, the needle seat is installed at the front end of the needle barrel, and is characterized in that a rotary A sheath, the rotating sheath is rotated to a side close to the needle barrel in an open position, and is rotated to the needle head in a protective position and protects the needle head in the rotating sheath, and the needle head is The tail end passes through the needle seat and continues to extend to the injection cavity and communicates with the injection cavity.

In the present invention, the above-mentioned structural form is adopted, so that the needle passes through the needle seat and is directly communicated with the injection cavity during the injection process, which greatly reduces the drug residue in the syringe.

Preferably, the front end of the syringe has a mounting seat and a communication hole communicating with the injection cavity, the needle seat is inserted into the mounting seat, and the needle is aligned and inserted into the communication hole. The use of the mounting seat to dock with the needle seat replaces the conical mouth of the traditional syringe, further reducing the drug residue in the syringe.

Preferably, the inner wall of the front end of the injection cavity is a conical surface that protrudes forward, the syringe further includes a push rod located in the injection cavity, and the front end surface of the push rod is connected to the injection cavity. Match with the inner wall of the front end. By adopting the above structure, the push rod can smoothly push out all the medicines in the injection cavity.

Preferably, the communication hole is located at the top of the conical surface, and the conical surface extends obliquely from the periphery to the communication hole. As a result, it is easier for the drug to converge to the communication hole, so as to be injected through the needle.

Preferably, the drug residual space in the anti-needle-stick syringe is jointly surrounded by the side wall of the communication hole, the bottom surface of the needle seat and the front end surface of the push rod. Therefore, the drug residual space in the needle stick-proof syringe is further reduced, so as to reduce the drug residual space.

Preferably, the side of the rotating sheath facing the needle has a needle limiting member, and a needle limiting space is formed between the needle limiting member and the inner wall of the rotating sheath, and the rotating sheath rotates. In the process of reaching the protection position, the needle head enters the limiting space through the needle limiting member, and is limited in the limiting space by the limiting member.

The needle stopper can prevent the needle from entering the limiting space or avoid being detached again, thereby ensuring that after the needle is used, the rotating sheath can always cover the needle, avoiding the accidental exposure of the needle and the risk of stabbing the medical staff.

Preferably, an angle is formed between the needle stopper and the inner wall of the rotating sheath, the opening side of the angle faces the side away from the needle, and the rotating sheath rotates to the protection position. During the process, the needle head slides into the limiting space along the outer surface of the needle limiting member. On the one hand, the downwardly set included angle can ensure that the needle head can smoothly slide into the limiting space, and on the other hand, the needle head can be restricted on both sides of the included angle to prevent the needle head from coming out.

Preferably, a plurality of protruding ribs are formed on the inner wall of the rotating sheath, the protruding ribs extend along the length direction of the rotating sheath, and the limiting space is formed between the protruding ribs and the limiting member. between. The protruding ribs can contact the needle head in a raised manner, so as to provide support between the inner wall of the rotating sheath and the needle head, and prevent the needle head from breaking after being impacted.

Preferably, a through adjustment notch is formed on the inner wall of the rotating sheath, and the adjustment notch communicates with the limiting space. The adjustment notch facilitates external tool access to move the needle out of the detent space, thereby providing a return function in the event of interoperability to open the swivel sheath to the swivel position.

Preferably, the rear end of the rotating sheath has a limit clip, and when the rotating sheath rotates to the end of the open position and/or the protection position, the limit clip will jam the needle. seat to prevent the needle seat from continuing to rotate towards the side away from and/or closer to the needle. The limit clip can prevent the rotating sheath from moving beyond the open position and/or the protection position, and ensure that the rotating sheath can be kept in the normal use range.

Preferably, the needle seat has a stepped front stepped surface and a rear stepped surface, and when the rotating sheath is rotated to the end of the open position, the limit clip is stuck on the front stepped surface, And/or when the rotating sheath rotates to the end of the protection position, the limiting clip catches the rear stepped surface. The front stepped surface and the rear stepped surface respectively serve to limit the different limit positions of the rotating sheath, so that the limit of the rotating sheath can be completed through one needle seat.

Preferably, the injection cavity is pre-filled with drugs.

The positive improvement effect of the present invention is that: the needle stick of the present invention is arranged to pass through the needle seat, and the needle is directly communicated with the injection cavity during the injection process, which greatly reduces the drug residue in the syringe and can accurately control the dose.

Description of drawings

FIG. 1 is a perspective view of a needle stick-proof syringe according to a preferred embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the rotating sheath in the open position according to the preferred embodiment of the present invention.

FIG. 3 is a schematic view of the structure of the rotating sheath in the protection position according to the preferred embodiment of the present invention.

4 is a partial cross-sectional view of the needle stick-proof syringe according to the preferred embodiment of the present invention.

FIG. 5 is a schematic three-dimensional structural diagram of the connection between the injection cavity and the needle according to the preferred embodiment of the present invention.

FIG. 6 is a schematic plan view of the connection between the injection cavity and the needle according to the preferred embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a needle hub according to a preferred embodiment of the present invention.

FIG. 8 is a schematic structural diagram of a mounting seat according to a preferred embodiment of the present invention.

FIG. 9 is a schematic structural diagram of the engagement between the rotating sheath and the needle seat according to the preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of the inner side structure of the rotating sheath according to the preferred embodiment of the present invention.

FIG. 11 is a schematic plan view of the rotating sheath according to the preferred embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view along the line A-A in FIG. 11 .

Description of reference numbers:

Anti-Needle Syringe 100

Syringe 110

Injection cavity 120

Mount 130

Guide surface 131

Communication hole 140

side wall 141

Conical face 150

putter 160

Rubber stopper 161

Needle seat 2

Spindle 20

Front step face 201

Rear stepped surface 202

reserved hole 21

Bottom 22

Needle 3

Rotary sheath 4

Rotary slot 40

Needle stopper 41

Rib 42

Adjustment notch 43

Limit clip 44

Limit space B

Detailed ways

A preferred embodiment is given below, and the present invention is more clearly and completely described with reference to the accompanying drawings.

As shown in FIGS. 1-12 , this embodiment provides an anti-needle stick syringe 100 , which includes a syringe 110 , a needle 3 and a needle seat 2 . The inside of the syringe 110 is an injection cavity 120 , and the needle seat 2 is installed at the front end of the syringe 110 . , the tail end of the needle 3 passes through the needle base 2 and continues to extend to the injection cavity 120 , and communicates with the injection cavity 120 .

As shown in FIGS. 2 and 3 , a rotating sheath 4 is rotatably connected to the outside of the needle base 2 in this embodiment. The rotating sheath 4 rotates to the side close to the needle cylinder in an open position, and rotates to the needle head 3 in a protective position. And protect the needle 3 in the rotating sheath 4. In a preferred embodiment, the rotating sheath 4 is connected with the rotating shaft 20 on the needle seat 2 through the rotating clamping slot 40 .

In the prior art, the drug usually remains in the conical opening at the front end of the injection cavity 120 and the inner space of the needle seat 2, especially when the small dose is injected, the error is large, which may reduce the injection volume of the drug. In this embodiment, the medicine in the injection cavity 120 directly enters the needle 3 from the front end of the injection cavity 120, and then enters the human body. Since the cone mouth is eliminated and the needle 3 is directly communicated with the injection cavity 120 , the space for the drug residue is minimized, and the drug residue in the syringe 110 after the injection is completed can be significantly reduced.

As shown in FIG. 5 , FIG. 6 , and FIG. 8 , in this embodiment, the front end of the syringe 110 has a mounting seat 130 and a communication hole 140 communicating with the injection cavity 120 , the needle seat 2 is inserted into the mounting seat 130 , the needle 3 Aligned and connected to the communication hole 140 . Wherein, the mounting seat 130 is integrally formed with the syringe 110 .

In this embodiment, the bottom surface 22 of the needle hub 2 is matched with the inner plane of the mounting seat 130 , and both are planes and are in close contact with each other. At the same time, the position of the reserved hole 21 for accommodating the needle 3 in the needle seat 2 coincides with the position of the communication hole 140 in the mounting seat 130, so as to ensure that the needle 3 can smoothly enter the communication hole after passing through the needle seat 2 140.

Specifically, the inner diameter of the communication hole 140 is larger than the outer diameter of the needle 3 . In this way, after the tail end of the needle 3 passes through the needle base 2, it enters the communication hole 140, which can minimize the residue of the medicine in the syringe. In order to enable the needle 3 to smoothly enter the communication hole 140 within the tolerance allowable range, in this embodiment, the reserved hole 21 and the communication hole 140 are arranged concentrically.

In this embodiment, the communication hole 140 is arranged in the center of the mounting seat 130 , and the reserved hole 21 is arranged in the center of the needle seat 2 , so that the reserved hole 21 and the communication hole 140 are realized when the needle seat 2 is installed on the mounting seat 130 . automatic alignment.

Based on the above concept, another implementation is also provided in this embodiment, that is, a matching structure, such as a concave-convex key or a bayonet, is provided between the needle seat 2 and the mounting seat 130 to realize the preciseness of the reserved hole 21 and the communication hole 140 position. After the needle seat 2 and the mounting seat 130 are inserted at a fixed angle, the reserved hole 21 and the communication hole 140 will be automatically aligned.

In this embodiment, the needle hub 2 is mounted on the mounting seat 130, while in other embodiments of the present invention, the needle hub 2 can be integrally formed with the mounting seat 130, that is to say, the bottom of the needle hub 2 has a structure similar to that of the mounting seat 130. part of the seat 130, and through which it is integrally formed with the syringe 110. Those skilled in the art can also improve the existing conical structure of the front end of the syringe, and make the conical structure of the front end of the syringe and the needle seat 2 integrally formed in the manufacturing process, so as to achieve the effect of reducing the number of parts and simplifying the overall structure , which indirectly reduces the assembly difficulty and improves the manufacturing efficiency.

As shown in FIGS. 1-6 , in this embodiment, the inner wall of the front end of the injection cavity 120 is a tapered surface 150 that protrudes forward, and the syringe 110 further includes a push rod 160 located in the injection cavity 120 . The push rod 160 further includes a rubber plug 161 fixed to the front end of the push rod 160 . The front end surface of the rubber plug 161 is matched with the inner wall of the front end of the injection cavity 120 . The communication hole 140 is located at the top of the conical surface 150 , and the conical surface 150 extends obliquely toward the communication hole 140 from the periphery.

In this embodiment, since the front end of the syringe 110 forms the inner plane of the mounting seat 130, and the inner wall of the front end of the injection cavity 120 is the tapered surface 150, the front end wall thickness of the syringe 110 is changed from the conventional wall thickness around the center to the middle. The thickness is gradually reduced until a communication hole 140 is formed in the middle.

It can be seen that, on the premise that the wall thickness of the front end of the syringe does not change, if the apex angle of the tapered surface 150 is small, the diameter of the communication hole 140 will increase. Conversely, if the size of the apex angle of the tapered surface 150 increases, the hole depth of the communication hole 140 increases. The residual amount of the drug in the syringe is largely determined by the volume of the communication hole 140. In order to reduce the residual amount of the drug in the syringe as much as possible, considering the difficulty of the manufacturing process and the requirements of structural strength, it is necessary to do as much as possible within the allowable range. Therefore, both the diameter and the depth of the communication holes 140 are set to a relatively minimum value, thereby reducing the volume of the communication holes 140 .

As a supplement, on the premise that other parameters and structural forms remain unchanged, since the volume of the communication hole 140 is proportional to the square of the hole diameter and to the hole depth, within a certain angle range, the top of the conical surface 150 The angle must be able to take an extreme value, so that the volume of the communication hole 140 can take the minimum value, so that the residual amount of the medicine in the syringe can take the minimum value.

Specifically, in this embodiment, since the cross-sectional area of the tapered surface 150 in the axial direction of the syringe 110 becomes smaller and smaller, the medicine is more likely to be collected at the communication hole 140 . In this embodiment, a rubber plug 161 conforming to the tapered surface 150 is used. When the push rod 160 is at the bottom, the front end surface of the rubber stopper 161 can fit with the tapered surface 150 , so that the medicine in the injection cavity 120 can be pushed out smoothly, and then the injection can be completed through the needle 3 into the body.

The following will specifically describe the characteristics of the anti-needle stick syringe 100 in this embodiment for reducing drug residues based on the above structure and in conjunction with the accompanying drawings.

As shown in FIGS. 1-6 , in this embodiment, the medicine in the anti-needle stick syringe 100 mainly remains in the communication hole 140 and the needle 3 . Among them, the inner diameter of the needle 3 is extremely small and can be ignored. The space in the communication hole 140 is jointly enclosed by the side walls 141 around the communication hole 140 , the bottom surface 22 of the needle seat 2 and the central area of the front end surface of the push rod 160 . Since the push rod 160 includes the rubber plug 161 at the front end, the central area of the front end surface of the rubber plug 161 protrudes a small distance, so the space in the communication hole 140 is approximately a cylindrical shape, and its volume is approximately equal to a quarter of the hole The product of the depth and the square of the aperture.

On the one hand, in this embodiment, the hole depth is equal to the wall thickness of the front end of the syringe 110 minus the distance that the tapered surface 150 protrudes forward, wherein the wall thickness of the front end of the syringe 110 itself is thinner, minus a certain distance Next is the hole depth of the communication hole 140 . Further, the needle 3 is inserted into the communication hole 140 for a certain distance, so that the part of the communication hole 140 closest to the needle 3 cannot be filled with the medicine.

On the other hand, in the present embodiment, the diameter of the communication hole 140 is slightly larger than the outer diameter of the needle 3 without considering the influence of assembly error and processing tolerance. Even so, since the outer diameter of the needle 3 is small, although the diameter of the communication hole 140 is slightly larger than the outer diameter of the needle 3, it is still small.

In this embodiment, the tail end of the needle 3 is inserted into the communication hole 140 for a certain distance. Due to the surface tension of the liquid, the medicine in the injection cavity 120 will directly enter the needle 3, so that the volume occupied by the residual medicine is further reduced.

After the above demonstration, it can be known that when using the needle stick-proof syringe 100 in this embodiment for small-dose drug injection, the residual drug can be controlled at a very low level, and the proportion of the total dose can be almost ignored, that is, Almost no effect on the effectiveness of the treatment. To sum up, in this embodiment, the total residual medicine volume inside the anti-needle stick syringe 100 is very small.

In the present embodiment, the diameter of the communication hole 140 is slightly larger than the outer diameter of the needle 3 so that the tail end of the needle 3 can be inserted into the communication hole 140 . However, the present invention is not limited to this, and the present invention also has various arrangement manners for making the tail end of the needle 3 communicate with the injection cavity 120 directly.

For example, in other embodiments, within the allowable range of accuracy, the diameter of the communication hole 140 is set to be the same as the inner diameter of the needle 3 . In this case, when the injection is completed, the space for the drug residue is only a section of cylinder with the same diameter as the inner diameter of the needle 3, and the drug residue can be ignored. Those skilled in the art should understand that the above solution can only be adopted when the machining accuracy and assembly accuracy meet certain requirements, otherwise the tail end of the needle 3 and the communication hole 140 may be misaligned, thereby affecting the injection effect.

As shown in FIG. 8 , the mounting seat 130 has an accommodating cavity inside, and an inwardly inclined guide surface 131 is provided at the opening of the accommodating cavity, and the guiding surface 131 is used to guide the needle hub 2 to be inserted into the accommodating cavity. Specifically, in this embodiment, the accommodating cavity in the mounting seat 130 and the needle seat 2 are both cylindrical. The diameter of the opening at the upper end of the mounting seat 130 is larger than the diameter of the needle seat 2 , and the opening is inclined and contracted inward to form the guide surface 131 . When installing the needle hub 2, slide the lower end of the needle hub 2 along the guide surface 131 and insert it into the accommodating cavity. Then, the needle 3 is passed through the needle hub 2, and the communication hole 140 can be accurately aligned.

In addition, at the upper end of the needle hub 2, there is also a guide structure with a similar shape for guiding the needle head 3 to be inserted into the needle hub 2. The diameter of the opening at the upper end of the needle seat 2 is larger than the diameter of the needle head 3 , and the opening is inclined and contracted inwardly to form a guide surface 131 . In this way, the difficulty of installing the needle 3 is greatly reduced, thereby saving the operation time of assembly.

As shown in FIGS. 10-12 , in a preferred embodiment, the side of the rotating sheath 4 facing the needle head 3 has a needle stopper 41 , and a needle head is formed between the needle stopper 41 and the inner wall of the rotating sheath 4 3 Limiting space B. During the process of rotating the rotating sheath 4 to the protective position, the needle 3 enters the limiting space B through the needle limiting member 41 and is limited in the limiting space B by the limiting member. The needle stopper 41 can prevent the needle 3 from entering the limiting space B or prevent it from disengaging again, thereby ensuring that after the needle 3 is used, the rotating sheath 4 can always cover the needle 3 to avoid accidental exposure of the needle 3, which may cause harm to medical staff. Risk of stabbing.

As shown in FIGS. 10-12, in a further preferred embodiment, an angle C is formed between the needle stopper 41 and the inner wall of the rotating sheath 4, and the opening side of the angle C faces the side away from the needle 3, During the process of rotating the rotating sheath 4 to the protection position, the needle 3 slides into the limiting space B along the outer surface of the needle limiting member 41 . The downwardly set angle C can ensure that the needle 3 can smoothly slide into the limiting space B on the one hand, and can also limit the needle 3 on both sides of the angle to prevent the needle 3 from coming out.

As shown in FIGS. 10-12 , in a further preferred embodiment, a plurality of protruding ribs 42 are formed on the inner wall of the rotating sheath 4 , the protruding ribs 42 extend along the length direction of the rotating sheath 4 , and the limiting space B is formed between the rib 42 and the limiting member. The protruding ribs 42 can be in contact with the needle head 3 by means of cushioning, so as to provide support between the inner wall of the rotating sheath 4 and the needle head 3 to prevent the needle head 3 from breaking after being impacted.

As shown in FIGS. 10-12 , in a further preferred embodiment, the inner wall of the rotating sheath 4 is formed with a through adjustment notch 43 , and the adjustment notch 43 communicates with the limiting space B. The adjustment notch 43 facilitates the movement of the needle 3 out of the limiting space B through the entry of an external tool, thereby providing a recovery function under the condition that the rotating sheath 4 is opened to the rotating position by interoperability.

As shown in FIGS. 10-12, in a further preferred embodiment, the rear end of the rotating sheath 4 has a limit clip 44. When the rotating sheath 4 rotates to the end of the open position and/or the protection position, The limiting clip 44 clamps the needle holder 2 to prevent the needle holder 2 from continuing to rotate toward the side away from and/or close to the needle head 3 . The limiting clip 44 can prevent the rotating sheath 4 from moving beyond the open position and/or the protection position, and ensure that the rotating sheath 4 can be kept in the normal use range.

As shown in FIGS. 10-12, in a further preferred embodiment, the needle hub 2 has a stepped front stepped surface 201 and a rear stepped surface 202. When the rotating sheath 4 rotates to the end of the open position, the limit When the clamping piece 44 clamps the front stepped surface 201 , and/or when the rotating sheath 4 rotates to the end of the protection position, the limiting clamping piece 44 clamps the rear stepped surface 202 . The front stepped surface 201 and the rear stepped surface 202 respectively serve to limit the different extreme positions of the rotating sheath 4 , so that the rotating sheath 4 can be limited by one needle holder 2 .

In addition, the injection cavity 120 in this embodiment is pre-filled with medicine. Prefilled doses are precisely controlled by the machine and ready for immediate use without refilling the drug. Specifically, for use scenarios that require precise control of drug doses, such as small-dose injection, it is more accurate to use large precision instruments for drug preloading. In this embodiment, in combination with the feature of the anti-needle stick syringe 100 that there is very little drug residue, it is convenient for medical staff to precisely control the injected drug dose.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

An anti-needle puncture syringe, comprising a needle barrel, a needle and a needle seat, the inside of the barrel is an injection cavity, and the needle seat is installed at the front end of the needle barrel, and is characterized in that the outside of the needle seat is rotatably connected with a rotating A sheath, the rotating sheath is rotated to a side close to the needle barrel in an open position, and is rotated to the needle head in a protective position and protects the needle head in the rotating sheath, and the needle head is The tail end passes through the needle seat and continues to extend to the injection cavity and communicates with the injection cavity.
The anti-needle-stick syringe according to claim 1, wherein the front end of the syringe has a mounting seat and a communication hole communicating with the injection cavity, the needle seat is inserted into the mounting seat, and the The needle is aligned and inserted into the communication hole.
The anti-needle-stick syringe according to claim 2, wherein the inner wall of the front end of the injection cavity is a tapered surface that protrudes forward, and the syringe further comprises a push rod located in the injection cavity, so The front end face of the push rod is matched with the inner wall of the front end of the injection cavity.
The anti-needle-stick syringe according to claim 3, wherein the communication hole is located at the top of the conical surface, and the conical surface extends obliquely from the periphery to the communication hole.
The anti-needle-stick syringe according to claim 3, wherein the drug residual space in the anti-needle-stick syringe is composed of the side wall of the communication hole, the bottom surface of the needle seat and the front end surface of the push rod. surrounded together.
The anti-needle-stick syringe according to claim 1, wherein a side of the rotating sheath facing the needle has a needle stopper, and the needle stopper is located between the needle stopper and the inner wall of the rotating sheath A needle limiting space is formed. During the process of rotating the rotating sheath to the protective position, the needle enters the limiting space through the needle limiting member, and is limited by the limiting member to the limit. in bit space.
The anti-needle-stick syringe according to claim 6, wherein an angle is formed between the needle stopper and the inner wall of the rotating sheath, and the opening side of the angle faces the side facing away from the needle head , in the process of rotating the rotating sheath to the protection position, the needle head slides into the limiting space along the outer surface of the needle limiting member.
The anti-needle-stick syringe of claim 6, wherein the inner wall of the rotating sheath is formed with a plurality of protruding ribs, the protruding ribs extend along the length direction of the rotating sheath, and the limiting space formed between the protruding rib and the limiting member.
6. The anti-needle-stick syringe according to claim 6, wherein a through adjustment notch is formed on the inner wall of the rotating sheath, and the adjustment notch communicates with the limiting space.
The anti-needle-stick syringe according to claim 1, wherein the rear end of the rotating sheath has a limit clip, and when the rotating sheath is rotated to the end of the open position and/or the protection position , the limiting clip blocks the needle seat to prevent the needle seat from continuing to rotate toward the side away from and/or close to the needle head.
The anti-needle-stick syringe according to claim 10, wherein the needle seat has a stepped front stepped surface and a rear stepped surface, and when the rotating sheath is rotated to the end of the open position, the The limit clip is stuck on the front stepped surface, and/or when the rotating sheath is rotated to the end of the protection position, the limit clip is stuck on the rear stepped surface.
The anti-needle-stick syringe according to any one of claims 1-11, wherein the injection cavity is pre-filled with medicine.