CN215351253U - Puncture-proof injector capable of controlling injection depth - Google Patents

Abstract

The utility model discloses a puncture-proof injector capable of controlling injection depth, which comprises an injector and a transparent sleeve, wherein a first limiting slide block is arranged on the outer wall of a needle cylinder, a second limiting slide block is arranged on the inner peripheral side of the transparent sleeve, the first limiting slide block is aligned with a first inserting port and penetrates through the second limiting slide block, and then the needle cylinder or the transparent sleeve is rotated to enable the first limiting slide block to be positioned in the transparent sleeve and to be staggered with the first inserting port, so that the transparent sleeve is limited to axially slide along the needle cylinder and cannot fall out of the needle cylinder. The syringe needle stretches out or retracts into the transparent sleeve along with the relative sliding of the transparent sleeve and the syringe, so that the anti-puncturing effect is achieved, in addition, when the anti-puncturing needle is used, the transparent sleeve is firstly abutted to the skin to be punctured, the skin is positioned, then the needle cylinder is pinched into the skin, and the depth of the needle head penetrating into the skin is controlled by the distance between the position where the medical personnel pinch the syringe needle and the end part of the transparent sleeve.

Description

Puncture-proof injector capable of controlling injection depth

Technical Field

The utility model relates to the field of medical instruments, in particular to a puncture-proof injector capable of controlling injection depth.

Background

A syringe is a commonly used medical device, and existing syringes are equipped with needle caps in order to prevent contamination by the pillow piercing through the sterile packaging bag during storage and transportation. When in use, medical care personnel need to pull out the needle cap firstly and insert the needle head into the ampoule bottle to extract the liquid medicine. After the liquid medicine is extracted, the injector is transferred to a patient body for injection, and in the transfer process, a needle head of the injector is exposed, so that the hidden danger of stabbing other people or medical care personnel exists, the hidden danger is easily polluted by bacteria, and the risk of infection of the patient is caused. And because the patient is dodged because of fear during injection, especially children patient can avoid struggling, and cause the deviation of injection depth. After the injection, the needle head is pulled out, and the needle cap needs to be sleeved again, so that accidental puncture is easy to happen, and at the moment, if the patient suffers from infectious diseases such as AIDS, syphilis, hepatitis B and the like, the harm to medical staff is very serious.

In view of the above, how to make the injector effectively puncture-proof and control the injection depth is a technical problem to be solved in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a puncture-proof injector capable of controlling injection depth, which aims to solve the problems that the existing injector is easy to puncture self or other people, and the injection depth and the injection part are uncontrollable.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

a puncture resistant syringe with controllable injection depth, comprising: the syringe comprises a syringe barrel, a needle head arranged at one end of the syringe barrel and a piston inner core capable of sliding in the syringe barrel; the transparent sleeve is sleeved outside the injector in a sliding manner; a first limiting slide block is arranged on the outer wall of the needle cylinder, and a second limiting slide block is arranged on the inner peripheral side of one end of the transparent sleeve; the second limiting slide block is a circular ring which is annularly arranged on the inner wall of the transparent sleeve, and the inner diameter of the second limiting slide block is matched with the outer diameter of the needle cylinder; a first inserting port for the first limiting sliding block to pass through is formed in the second limiting sliding block along the radial direction of the transparent sleeve, and the number of the first inserting ports is matched with that of the first limiting sliding block; wherein, the needle head extends out of or retracts into the transparent sleeve along with the relative sliding of the transparent sleeve and the needle cylinder.

Further, the syringe is provided with length scales in the axial direction.

Further, the number of scales of the length scales gradually increases towards the direction of being away from the first limiting block, wherein when one end, close to the second limiting slide block, of the transparent sleeve is located at the zero scale, the end of the needle head is flush with the other end of the transparent sleeve.

The utility model provides a steerable injection depth's puncture-proof syringe still includes that the ring locates the fourth limit slide on the transparent sleeve inner wall, and the fourth limit slide is the ring, and the second interface that supplies first limit slide to pass is seted up to the fourth limit slide, and the distance between fourth limit slide and the second limit slide is greater than the thickness of first limit slide, and when first limit slide was located between fourth limit slide and the second limit slide, the syringe needle retracted completely the transparent sleeve.

Furthermore, the first inserting port is aligned with the second inserting port in the axial direction of the transparent sleeve, and one or more arc-shaped grooves with two ends allowing the first limiting sliding block to slide in or slide out are formed between the fourth limiting sliding block and the second limiting sliding block.

Furthermore, the side wall of the second limiting slide block facing the fourth limiting slide block is provided with an elastic strip, and the first limiting slide block extrudes the elastic strip to slide in the arc-shaped groove.

Further, the groove width of the end part of the arc-shaped groove is larger than the outer diameter of the first limiting sliding block.

The puncture-proof injector capable of controlling the injection depth further comprises third limiting slide blocks arranged on the outer peripheral wall of the needle cylinder, the number of the third limiting slide blocks is matched with that of the first inserting ports, and the third limiting slide blocks can penetrate through the first inserting ports; when the second limiting slide block is positioned on one side of the third limiting slide block far away from the needle head, the needle head is completely exposed out of the transparent sleeve.

Furthermore, the first limiting slide block is positioned at one end of the needle cylinder close to the needle head.

Furthermore, a trumpet-shaped guide part is arranged on the inner side of one end, away from the second limiting block, of the transparent sleeve, and the large opening end of the guide part is connected with the end, away from the second limiting block, of the transparent sleeve.

Compared with the prior art, the utility model has the following beneficial effects:

(1) according to the utility model, the first limiting slide block is arranged on the outer wall of the needle cylinder, the second limiting slide block is arranged on the inner peripheral side of the transparent sleeve, the first limiting slide block is arranged on the second limiting slide block and passes through the first inserting port, after one end of the needle cylinder close to the needle head passes through the second limiting slide block, the first limiting slide block aligns with the first inserting port and passes through the second limiting slide block, and then the needle cylinder or the transparent sleeve is rotated, so that the first limiting slide block is positioned in the transparent sleeve and is staggered with the first inserting port, and the transparent sleeve is limited to slide along the axial direction of the needle cylinder and cannot fall out of the needle cylinder. The needle head extends out of or retracts into the transparent sleeve along with the relative sliding of the transparent sleeve and the needle cylinder, thereby playing the role of puncture prevention.

And when using, earlier with transparent sleeve support the skin department of pricking in needs, fix a position, then prick the skin with pinching the cylinder, through the distance that medical personnel pinched the position of cylinder apart from the transparent sleeve and is equipped with the one end tip of second spacing slider, control the degree of depth that the syringe needle pricked the skin.

(2) The needle cylinder is axially provided with the length scales, so that the depth of the needle cylinder penetrating into the skin is more accurate and controllable.

(3) The scale number of the length scale is gradually increased towards the direction far away from the first limiting block, and when one end of the transparent sleeve close to the second limiting slide block is positioned at the zero scale, the end part of the needle head is flush with the other end of the transparent sleeve. During the use, earlier support the skin with transparent sleeve, fixed transparent sleeve on the other hand holds between the fingers the scale department that needs to pierce the degree of depth on the other hand, and the lower limb of finger flushes with needs scale department, then pricks the skin downwards hard, and the transparent sleeve of finger striking stops to continue to prick into, and consequently, the scale that the finger lower limb was aimed at is the degree of depth of piercing of syringe needle promptly.

(4) The injector of the utility model is also provided with a fourth limiting slide block, which limits the sliding of the needle cylinder relative to the transparent sleeve, prevents the needle head from being exposed out of the transparent sleeve and enhances the stability of the initial state.

(5) According to the utility model, the first socket and the second socket block are aligned in the axial direction of the transparent sleeve, one or more arc-shaped grooves with two ends allowing the first limiting slide block to slide in or out are formed between the second limiting slide block and the fourth limiting slide block, so that the first limiting slide block is limited in the arc-shaped grooves, the transparent sleeve is not easy to fall off from the needle cylinder, the transparent sleeve and the needle cylinder are not easy to slide relatively, and the condition that the needle head is exposed out of the transparent sleeve due to bumping in the transportation process of the injector is prevented.

(6) The side wall of the second limiting slide block facing the fourth limiting slide block is provided with the elastic strip, the deformation generated by the elastic strip generates certain resistance to the first limiting slide block, the resistance can effectively prevent the transparent sleeve from randomly rotating relative to the needle cylinder, and the first limiting slide block can be effectively limited in the arc-shaped groove under the condition that the needle cylinder is not rotated by external force, so that the transparent sleeve and the needle cylinder are locked.

(7) The groove width of the end part of the arc-shaped groove is larger than the outer diameter of the first limiting slide block, so that the first limiting slide block can slide into the arc-shaped groove smoothly.

(8) The syringe is also provided with a third limiting slide block, so that the needle head of the syringe is fixed in a state of completely exposing the transparent sleeve and is used as the existing syringe.

(9) The first limiting slide block is positioned at one end of the needle cylinder close to the needle head, so that the length of the transparent sleeve is as short as possible, and the transparent sleeve is prevented from blocking the operation of the injector.

(10) The horn-shaped guide part is arranged on the inner side of one end, away from the second limiting block, of the transparent sleeve, when liquid medicine is extracted, the opening of the ampoule bottle is aligned with the guide part and slides in from the large opening end of the guide part, then the liquid medicine is extracted by aligning the piston inner core with the needle head, and the problem that fingers are easily punctured when the needle head is aligned with the bottle opening of the ampoule bottle in the prior art is solved.

Drawings

Fig. 1 is a view showing a state of use of a syringe according to the prior art.

Fig. 2 is a structural diagram of a puncture-proof syringe capable of controlling an injection depth according to a first embodiment of the present invention.

Fig. 3 is an assembly view of the first limit slider and the second limit slider according to the first embodiment of the present invention.

Fig. 4 is a sectional view of a pricking prevention syringe capable of controlling an injection depth according to a second embodiment of the utility model.

Fig. 5 is a structural diagram of a puncture-proof syringe capable of controlling an injection depth according to a third embodiment of the present invention.

Fig. 6 is a structural diagram of a pricking prevention syringe capable of controlling an injection depth according to a fourth embodiment of the utility model.

Fig. 7 is a cross-sectional view of a transparent sleeve provided in a fifth embodiment of the present invention.

Injector-10; a syringe-11; a needle head-12; a piston inner core-13; a first limit slide block-14; a third limiting slide block-15; length scale-16;

a transparent sleeve-20; a second limit slide block-21; a first interface-211; an arcuate slot-212; elastic strip-213; a fourth limiting slide block-22; a second interface-221; a guide portion-23.

Detailed Description

The present invention is further illustrated by the following figures and examples, which include, but are not limited to, the following examples.

Referring to fig. 1, a conventional syringe body 10 includes a cylinder 11, a needle 12 and a plunger 13, an outer packing bag of the syringe body 10 is opened, a needle cap (not shown) is removed, and the needle 12 is inserted into an ampoule bottle 1 to draw a liquid medicine. In the process of pulling out the needle cap and inserting the needle cap into the ampoule bottle 1, the user or other people are easy to be stabbed, the liquid medicine is taken out, the injector is transferred to the body of a patient, the stabbed risk is easy to occur again, the exposed needle head has the risk of infecting bacteria, and meanwhile, when the injection is carried out, the patient, particularly an infant patient, avoids shaking behaviors, and causes the deviation of the injection position and the injection depth.

Therefore, the utility model provides a new scheme to solve the problems that the existing injector has puncture risks and the deviation of the injection position and the injection depth.

For a more clear presentation, the utility model is described in detail below with reference to the accompanying drawings.

Example one

Referring to fig. 2 and 3, a puncture resistant syringe capable of controlling an injection depth includes: the syringe 10 comprises a syringe barrel 11, a needle 12 arranged at one end of the syringe barrel 11 and a piston inner core 13 capable of sliding in the syringe barrel 11. The transparent sleeve 20 is sleeved outside the injector 10 in a sliding manner, a first limiting slide block 14 is arranged on the outer wall of the needle cylinder 11, and a second limiting slide block 21 is arranged on the inner peripheral side of one end of the transparent sleeve 20. The second limiting slide block 21 is a circular ring circumferentially arranged along the transparent sleeve 20, the inner diameter of the second limiting slide block 21 is matched with the outer diameter of the needle cylinder 11, so that the needle cylinder can penetrate through the second limiting slide block, the second limiting slide block 21 is radially provided with a first inserting port 211 for the first limiting slide block 14 to penetrate through along the transparent sleeve 20, and the size, the number and the position relation of the inserting port are matched with the first limiting slide block 14. The needle 12 extends or retracts from the transparent sleeve 20 as the transparent sleeve 20 slides relative to the barrel 11. Preferably, the distance between one end of the transparent sleeve far away from the second limiting slide block 21 and the second limiting slide block is greater than the distance between the first limiting slide block and the end part of the needle head, that is, the needle head can be completely retracted into the transparent sleeve, so that the puncture-proof effect is realized. The distance between the first limiting sliding block and one end, far away from the needle head, of the transparent sleeve is larger than the length of the transparent sleeve, namely, the needle head can completely extend out of the transparent sleeve and is used as a common injector. The first limit slider 14 is located at one end of the barrel 11 close to the needle 12, so that the length of the transparent sleeve 20 is as short as possible, and the transparent sleeve 20 is prevented from obstructing the operation of the syringe.

When the injector 10 is assembled with the transparent sleeve 20, one end of the needle cylinder 11 close to the needle head 12 is inserted into the transparent sleeve 20 from one end of the transparent sleeve 20 provided with the second limit slider 21, and the first limit slider 14 is aligned with the first insertion port 211 and penetrates through the second limit slider 21, so that the transparent sleeve 20 is sleeved outside the injector 10 in a sliding manner, and then the needle cylinder 11 or the transparent sleeve 20 is rotated, so that the first limit slider 14 is positioned in the transparent sleeve 20 and is staggered with the first insertion port 211, and the transparent sleeve 20 is prevented from being separated from the injector 10. And, when using, medical personnel support transparent sleeve 20 earlier at the skin department that needs prick, fix a position, then hold between fingers certain position of syringe 11 and promote syringe 11 and make syringe needle 12 prick the skin, and the finger that until medical personnel held between fingers syringe 11 supports with the tip that transparent sleeve 20 is equipped with the one end of second limit slider 21, promptly, medical personnel controls the degree of depth that the syringe needle pierces the skin through holding the position that the finger held between fingers the syringe and the transparent sleeve is equipped with the distance of the one end tip of second limit slider 21.

The axial of cylinder 11 is provided with length scale 16 for it is more accurate controllable to the degree of depth of stabbing skin, and the number of graduations of length scale 16 is towards keeping away from first stopper 14 direction crescent, and when transparent sleeve 20 was close to the one end of second limit slider 21 and was located zero scale department, the tip of syringe needle 12 flushed with the other end of transparent sleeve 20. During the use, support transparent sleeve 20 skin earlier, carry out the location of acupuncture department, fixed transparent sleeve 20 on the other hand holds between the fingers the scale department that needs to pierce the degree of depth on the other hand, and the lower limb of finger flushes with needs scale department, then pricks the skin downwards hard, and the finger strikes transparent sleeve's tip 20 and stops to continue to prick into, consequently, the scale that the finger lower limb was aimed at is the penetration depth of syringe needle promptly, has realized that the penetration depth is controllable.

Example two

Referring to fig. 4, the syringe of this embodiment is assembled in the same manner as the syringe of the first embodiment, the transparent sleeve is positioned, and both hands of the medical care professional cooperate with the length scales to control the penetration depth. The difference lies in that, in this embodiment, the horn-shaped guide portion 23 is disposed at the inner side of the end of the transparent sleeve 20 away from the second limiting block 21, when the liquid medicine is extracted, the opening of the ampoule bottle is aligned with the guide portion 23 to slide in, and then the piston inner core is aligned with the needle, so that the liquid medicine can be extracted by pulling the piston inner core, thereby improving the problem that the finger is easily pricked when the needle is aligned with the bottle mouth of the ampoule bottle in the past.

EXAMPLE III

Referring to fig. 5, the syringe of this embodiment is further improved on the basis of the first embodiment or the second embodiment, the syringe of this embodiment further includes a third position-limiting slider 15 disposed on the outer peripheral wall of the needle cylinder 11, the third position-limiting slider 15 is disposed on a side of the first position-limiting slider 14 away from the needle 12, and a distance between the third position-limiting slider 15 and the first position-limiting slider 14 is greater than or equal to a length of the transparent sleeve 20, that is, when the second position-limiting slider is located on a side of the third position-limiting slider away from the needle, the needle is completely exposed on one side of the transparent sleeve. The third limit slider 15 is adapted to the first interface 211, so that the second limit slider 21 can pass through the third limit slider 15 from the first interface 211. The needle of the syringe is fixed in a state where the transparent sleeve is completely exposed, and is used as a conventional syringe.

Example four

Referring to fig. 6, the syringe of this embodiment is further improved on the basis of the first embodiment, the second embodiment or the third embodiment, and the syringe of this embodiment further includes a fourth position-limiting slider 22 disposed on the inner peripheral side of the transparent sleeve, and the distance between the fourth position-limiting slider and the end of the transparent sleeve far away from the second position-limiting slider is greater than or equal to the distance between the first position-limiting slider and the end of the needle, so that the needle 12 is completely located in the transparent sleeve 20 when the first position-limiting slider is limited on the side of the fourth position-limiting slider facing the second position-limiting sliding groove. The fourth limiting slide 22 is provided with a second insertion port 221 adapted to the first limiting slide, so that the first limiting slide 14 can penetrate through the fourth limiting slide 22 to continue to penetrate towards the skin. The distance between the fourth limiting slide block 22 and the second limiting slide block 21 is larger than or equal to the thickness of the first limiting slide block 14, and the fourth limiting slide block 22 and the second limiting slide block 21 are prevented from being mutually influenced and assembled with the first limiting slide block 14. In this embodiment, the second position-limiting slider 21 prevents the transparent sleeve 20 from sliding toward the needle 12, so as to prevent the transparent sleeve 20 from falling off the barrel 11, and the fourth position-limiting slider 22 prevents the transparent sleeve 20 from sliding away from the needle 12, so as to prevent the needle 12 from exposing the transparent sleeve 20. Through the cooperation of second spacing slider 21 and fourth spacing slider 22, strengthened the stability of syringe initial condition. It can be understood that, in this embodiment, the second limit slider 21 and the fourth limit slider 22 may be aligned or misaligned in the axial direction of the transparent sleeve, and only the assembly relationship between the first limit slider 14 and the second limit slider 21 and the fourth limit slider 22 is considered.

EXAMPLE five

Referring to fig. 7, the syringe of the present embodiment is further improved on the basis of the fourth embodiment, and the syringe of the present embodiment also includes a fourth limiting slider 22 disposed on the inner peripheral side of the transparent sleeve, and the fourth limiting slider 22 is provided with a second insertion port 221 adapted to the first limiting slider 14, so as to facilitate the first limiting slider 14 to pass through. It can be understood that the number, size and relative position of the second insertion ports are matched with the first limit sliding blocks.

The difference from the fourth embodiment is that the second limit slider 21 and the fourth limit slider 22 form an arc-shaped groove 212, two ends of which can slide in or out the first limit slider 14. When the injector 10 is assembled with the transparent sleeve 20, one end of the needle cylinder 11 close to the needle head 12 is inserted into the transparent sleeve 20 from one end of the transparent sleeve 20 provided with the second limiting slide block, and the first limiting slide block 14 is aligned with the first inserting port 211 and penetrates through the second limiting slide block 21, so that the transparent sleeve 20 is sleeved outside the injector in a sliding manner, and then the needle cylinder 11 or the transparent sleeve 20 is rotated, so that the first limiting slide block 14 slides into the arc-shaped groove 212 and is limited in the arc-shaped groove 212, and further the transparent sleeve 20 is not easy to drop from the needle cylinder 11, and the transparent sleeve and the needle cylinder are not easy to slide relatively, and the needle head is prevented from being exposed out of the transparent sleeve due to bumping in the transportation process of the injector. Since the first interface and the second interface are aligned in the axial direction of the transparent sleeve, the syringe 10 and the transparent sleeve 20 can slide relatively after the first position-limiting slider 14 slides out of the arc-shaped slot 212.

The side wall of the second limit slider 21 facing the fourth limit slider 22 is provided with an elastic strip 213, and the first limit slider 14 extrudes the elastic strip 213 to slide in the arc-shaped groove 212. Deformation that the elastic strip produced produces certain resistance to the slider, and this resistance can prevent effectively that transparent sleeve 20 from the arbitrary rotation of cylinder 11 relatively, and under the condition that does not have external force to rotate cylinder 11, first spacing slider 14 can be effectual spacing in arc groove 212, realizes the locking of transparent sleeve 20 and cylinder 11. The width of the end of the arc-shaped groove 212 is larger than the outer diameter of the first limit slider 14, so that the first limit slider 14 can slide into the arc-shaped groove 212 smoothly.

In other embodiments, the first limiting slide block can be arranged in a sliding groove mode and can accommodate the second limiting block to slide inside. The number of the first limiting slide blocks and the number of the second limiting slide blocks can be one, two, three or more, and the needle cylinder and the transparent sleeve can be assembled.

According to the puncture-proof injector capable of controlling the injection depth, the transparent sleeve is assembled on the needle cylinder through the assembly of the first limiting slide block on the needle cylinder and the second limiting slide block in the transparent sleeve, the needle head retracts or exposes through the relative sliding between the transparent sleeve and the needle cylinder, so that the puncture-proof effect is achieved, the guide part facilitating the ampoule bottle to go deep is arranged at the end part of the needle head, and fingers are prevented from being punctured when the needle head extends into the ampoule bottle to extract liquid medicine. The depth of the needle head penetrating into the skin is controllable through the matching between the fingers of the medical care personnel and the length scales on the needle cylinder. The utility model has simple operation and practical function and is worth popularizing.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, but all changes that can be made by applying the principles of the present invention and performing non-inventive work on the basis of the principles shall fall within the scope of the present invention.

Claims (10)

1. A puncture resistant syringe capable of controlling the depth of injection, comprising: the syringe comprises a syringe barrel, a needle head arranged at one end of the syringe barrel and a piston inner core capable of sliding in the syringe barrel; the transparent sleeve is sleeved outside the injector in a sliding manner; a first limiting slide block is arranged on the outer wall of the needle cylinder, and a second limiting slide block is arranged on the inner peripheral side of one end of the transparent sleeve;

the second limiting slide block is a circular ring annularly arranged on the inner wall of the transparent sleeve, and the inner diameter of the second limiting slide block is matched with the outer diameter of the needle cylinder; a first inserting port for the first limiting sliding block to penetrate through is formed in the second limiting sliding block along the radial direction of the transparent sleeve, and the number of the first inserting ports is matched with that of the first limiting sliding block;

wherein, the needle head extends out of or retracts into the transparent sleeve along with the relative sliding of the transparent sleeve and the needle cylinder.

2. The pricking-prevention injector as claimed in claim 1, wherein the barrel is axially provided with length scales.

3. The pricking prevention syringe of claim 2, wherein the scale degree of the length scale gradually increases towards a direction away from the first limit block, and when one end of the transparent sleeve close to the second limit block is located at the zero scale, the end of the needle is flush with the other end of the transparent sleeve.

4. The pricking prevention syringe capable of controlling the injection depth according to claim 1, further comprising a fourth limiting slider annularly arranged on the inner wall of the transparent sleeve, wherein the fourth limiting slider is a circular ring, the fourth limiting slider is provided with a second insertion port for the first limiting slider to pass through, the distance between the fourth limiting slider and the second limiting slider is larger than the thickness of the first limiting slider, and when the first limiting slider is positioned between the fourth limiting slider and the second limiting slider, the needle head is completely retracted into the transparent sleeve.

5. The pricking-prevention syringe of claim 4, wherein the first interface and the second interface are aligned in an axial direction of the transparent sleeve, and one or more arc-shaped grooves are formed between the fourth limit slider and the second limit slider, and two ends of each arc-shaped groove are used for the first limit slider to slide in or out.

6. The pricking-prevention injector as claimed in claim 5, wherein an elastic strip is provided on a side wall of the second limiting slider facing the fourth limiting slider, and the first limiting slider presses the elastic strip to slide in the arc-shaped groove.

7. The pricking prevention injector of claim 6, wherein the width of the end of the arc-shaped groove is larger than the outer diameter of the first limiting slider.

8. The pricking prevention injector capable of controlling the injection depth according to claim 1, further comprising third limiting slide blocks arranged on the outer peripheral wall of the needle cylinder, wherein the number of the third limiting slide blocks is matched with the number of the first insertion ports, and the third limiting slide blocks can penetrate through the first insertion ports; when the second limiting slide block is positioned on one side of the third limiting slide block, which is far away from the needle head, the needle head is completely exposed out of the transparent sleeve.

9. The pricking prevention injector of claim 1, wherein the first stop slider is located at an end of the barrel near the needle.

10. A puncture-proof injector as claimed in any one of claims 1 to 9, wherein a flared guide is provided inside the end of the transparent sleeve remote from the second stopper, and the large open end of the guide is connected to the end of the transparent sleeve remote from the second stopper.

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