A syringe with a needle guard

Abstract

The application discloses a syringe with a function of preventing puncture, and relates to the technical field of medical devices.The syringe comprises a syringe barrel, a syringe needle fixedly installed at one end of the syringe barrel, and a syringe piston rod slidably installed in the syringe barrel; the syringe further comprises a protection assembly arranged outside the syringe barrel, wherein the protection assembly comprises a connecting sleeve attached to the outer wall of the syringe barrel, a protection sleeve fixedly connected to one end of the connecting sleeve, and a protection head fixedly connected to the outer surface of the other end of the protection sleeve away from the connecting sleeve; the connecting sleeve and the protection sleeve are arranged to form a rigid protection outside the syringe, and the rigid shell can effectively prevent medical staff or patients from directly contacting the needle area, thereby reducing the risk of puncture caused by accidental contact (especially in emergency operations or when the line of sight is blocked); in addition, in field first aid or disaster sites, the reinforcing structure can resist the damage of falling impact, low-temperature brittle fracture and other harsh conditions to the traditional plastic shell.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a syringe with anti-puncture function. Background Technology

[0002] A syringe is a medical device consisting of a syringe barrel and a piston rod. The syringe consists of a syringe barrel with a small hole at the front end and a matching piston rod. It is used to inject or extract small amounts of liquid into areas that are inaccessible by other methods. When the piston rod is pulled out, the liquid or gas is drawn in through the small hole at the front end of the syringe barrel, and when the piston rod is pushed in, the liquid or gas is expelled.

[0003] Traditional syringes have needles that are directly exposed when not in use, making them prone to accidentally puncturing gloves or skin, especially during transfer or disposal. In addition, in the field or in emergency situations, medical personnel need to hold multiple instruments at the same time when performing injections, which can lead to distraction and accidental needle pointing at themselves or others, resulting in puncture wounds.

[0004] To address this issue, we propose a syringe with puncture-proof function. Summary of the Invention

[0005] Technical problems to be solved

[0006] In view of this, and to address the shortcomings of the prior art, the present invention provides a syringe with anti-puncture function to solve the problems mentioned in the background art.

[0007] Technical solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a syringe with anti-puncture function, comprising a syringe barrel, a syringe needle fixedly installed at one end of the syringe barrel, a syringe piston rod slidably installed inside the syringe barrel, and a protective component disposed outside the syringe barrel;

[0009] The protective assembly includes a connecting sleeve that fits against the outer wall of the syringe barrel. A protective sleeve is snapped onto one end of the connecting sleeve. A protective cap is inserted into the outer surface of the protective sleeve at the end away from the connecting sleeve. Transparent windows are fixedly installed on both outer walls of the protective sleeve in an axially symmetrical manner with reference to the central axis of the connecting sleeve. A knob positioning component is threaded onto the inner wall of the end of the connecting sleeve away from the protective sleeve. A pressing sleeve is slidably connected inside the knob positioning component. A driven ring is fitted onto one end surface of the pressing sleeve inside the knob positioning component. A limit spring is sleeved on the outer surface of one end of the syringe barrel.

[0010] Preferably, the pressing sleeve is disposed outside the syringe piston rod, one end of the syringe piston rod extends outside the syringe barrel, and the end of the syringe piston rod extending outside the syringe barrel passes through and extends to the outside of the pressing sleeve. A sliding groove is formed inside the connecting sleeve at the end away from the protective sleeve. The driven ring is slidably connected inside the sliding groove. The surface of the driven ring away from the pressing sleeve is in contact with the surface of the syringe barrel away from the syringe needle. A limiting spring is disposed inside the sliding groove, and the two ends of the limiting spring are fixedly connected to the outer wall of the syringe barrel and the wall of the sliding groove, respectively.

[0011] Preferably, the protective sleeve has a through-hole at the center of the end furthest from the connecting sleeve, and the through-hole is located on the movement path of the syringe needle.

[0012] Preferably, it also includes a push assembly disposed on the connecting sleeve;

[0013] The pushing assembly includes a through groove symmetrically opened on the surface of the connecting sleeve away from the protective sleeve. Columnar connecting rods are fixedly connected to both outer surfaces of the driven ring in an axisymmetric manner with reference to the central axis of the driven ring. A positioning ring is inserted into the outer surface of the two columnar connecting rods at the ends away from the driven ring. A push rod is fixedly connected to one outer surface of the positioning ring in an axisymmetric manner with reference to the central axis of the positioning ring. An inclined extrusion piece is fixedly connected to the end of each push rod away from the positioning ring. Hemispherical blocks are fixedly connected at equal intervals to the outer surfaces of the two push rods at the ends away from each other. Blocking blocks are fixedly connected at equal intervals to the outer surfaces of the two push rods at the ends away from each other.

[0014] Preferably, the two cylindrical connecting rods are slidably connected to the inside of the two through slots, the positioning ring is slidably connected to the outer wall of the connecting sleeve, and the two inclined extrusion parts are arranged in a centrally symmetrical manner with reference to the center of the positioning ring.

[0015] Preferably, the hemispherical block is located in the middle of the push rod, and the blocking block is located on one side surface of the push rod. There are two sets of blocking blocks, and the two sets of blocking blocks are located on the two push rods respectively. The two sets of blocking blocks are centrally symmetrical with reference to the center of the positioning ring, and the blocking blocks on the same push rod are located between two adjacent hemispherical blocks.

[0016] Preferably, it also includes a snap-fit ​​assembly disposed on the surface of the connecting sleeve;

[0017] The snap-fit ​​assembly includes a limiting member fixedly connected to the outer wall of the connecting sleeve in an axisymmetric manner. A limiting groove is formed on one side of the outer surface of the limiting member. A return spring is fixedly installed inside the limiting groove. A limiting ring is slidably connected inside the two limiting grooves. The end of the return spring away from the groove wall of the limiting groove is fixedly connected to the outer wall of the limiting ring. A connecting groove is formed on the inner surface of the limiting ring in a centrally symmetrical manner with reference to the center of the limiting ring. A wedge is fixedly connected to one side of the groove wall of the connecting groove. A spherical locking block is fixedly connected to the center of the groove wall of the connecting groove.

[0018] Preferably, the limiting ring is rotatably connected to the outer wall of the connecting sleeve, and the surface of the wedge block away from the wall of the connecting groove is set as an inclined plane that fits with the inclined surface of the inclined extrusion part. The two wedge blocks are arranged in a centrally symmetrical manner with reference to the center of the limiting ring, and the two spherical blocks are arranged in a centrally symmetrical manner with reference to the center of the limiting ring.

[0019] Preferably, the outer walls at both ends of the two limiting members together form a connecting track, which is located on the movement path of the push rod.

[0020] Compared with the prior art, the present invention provides a syringe with anti-puncture function, which has the following beneficial effects:

[0021] By connecting the sleeve and the protective sleeve, a rigid protection can be formed on the outside of the syringe. The rigid shell can effectively prevent medical staff or patients from directly contacting the needle area, reducing the risk of needle stick injuries caused by accidental contact (especially in emergency operations or when visibility is obstructed). In addition, in field emergency rescue or disaster sites, the reinforced structure can resist the damage to traditional plastic shells caused by harsh conditions such as drop impacts and low-temperature brittleness.

[0022] The push rod, hemispherical block, and spherical locking block are designed to quickly fix the position of the syringe needle while removing it from the protective sleeve, reducing the time wasted in traditional step-by-step operations and avoiding delays in treatment. In addition, the arc-shaped contact surfaces of the spherical locking block and the hemispherical block form multi-point support, ensuring that the syringe needle axis is strictly aligned with the injection direction, reducing the risk of deviation caused by shaking, and thus ensuring that the syringe needle can accurately extend out of the protective sleeve, avoiding damage to the syringe needle.

[0023] The push rod, wedge, inclined extrusion component, hemispherical block, spherical locking block, and limiting ring are designed to prevent the hemispherical block and spherical locking block from failing to engage. This allows for quick positioning of the syringe needle extending beyond the protective sleeve while preventing the syringe sleeve from failing to stay in place. This also prevents the syringe needle from retracting into the protective sleeve during use. The wedge and inclined extrusion component form a bidirectional pressure path, so even if one component is worn or deformed, it can still maintain a locked state through other components.

[0024] The design incorporates a limiting ring, a return spring, a wedge, and a spherical locking block. By simply rotating the limiting ring in the reverse direction, the locking structure formed by the spherical locking block and the hemispherical block can be quickly released, allowing the syringe needle to retract into the protective sleeve. This ensures rapid needle retrieval and prevents needle injury to medical staff or patients. Furthermore, the potential energy stored in the return spring is converted into precise mechanical kinetic energy, actively pushing the syringe needle back into the protective sleeve instead of relying on gravity to fall naturally, ensuring complete retrieval even in tilted or vibrating environments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the connection relationship at the limiting member of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the protective sleeve of the present invention;

[0028] Figure 4 This is a schematic cross-sectional view of the internal structure of the protective sleeve of the present invention;

[0029] Figure 5 This is a schematic cross-sectional view of the syringe barrel of the present invention.

[0030] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the syringe barrel of the present invention;

[0031] Figure 7 This is an exploded view of the structure at the limiting ring of the present invention;

[0032] Figure 8 For the present invention Figure 7 Another perspective structural diagram;

[0033] Figure 9 This is a schematic diagram of the connection relationship at the positioning ring of the present invention;

[0034] Figure 10 This is a schematic diagram of the connection relationship at the driven ring of the present invention.

[0035] In the diagram: 11. Syringe barrel; 12. Syringe needle; 13. Syringe piston rod;

[0036] 21. Connecting sleeve; 22. Protective sleeve; 23. Protective sleeve head; 24. Transparent window; 25. Knob positioning component; 26. Pressing sleeve; 27. Driven ring; 28. Limit spring;

[0037] 31. Through slot; 32. Columnar connecting rod; 33. Positioning ring; 34. Push rod; 35. Inclined extrusion part; 36. Hemispherical block; 37. Blocking block;

[0038] 41. Limiting component; 42. Limiting slide; 43. Return spring; 44. Limiting ring; 45. Connecting groove; 46. Wedge block; 47. Spherical locking block. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Embodiments of the present invention

[0041] Please see Figures 1 to 7 A syringe with anti-puncture function includes a syringe barrel 11, a syringe needle 12 fixedly installed at one end of the syringe barrel 11, a syringe piston rod 13 slidably installed inside the syringe barrel 11, and a protective component disposed outside the syringe barrel 11.

[0042] The protective assembly includes a connecting sleeve 21 that fits against the outer wall of the syringe barrel 11. A protective sleeve 22 is snapped onto one end of the connecting sleeve 21. A protective sleeve head 23 is inserted and installed on the outer surface of the protective sleeve 22 away from the connecting sleeve 21. Transparent windows 24 are fixedly installed on both outer walls of the protective sleeve 22 in an axially symmetrical manner with reference to the central axis of the connecting sleeve 21. A knob positioning component 25 is threaded onto the inner wall of the connecting sleeve 21 away from the protective sleeve 22. A pressing sleeve 26 is slidably connected inside the knob positioning component 25. A driven ring 27 is fitted onto the inner surface of the pressing sleeve 26 inside the knob positioning component 25. A limit spring 28 is sleeved on the outer surface of one end of the syringe barrel 11.

[0043] The pressing sleeve 26 is disposed outside the syringe piston rod 13. One end of the syringe piston rod 13 extends out of the syringe barrel 11, and the end of the syringe piston rod 13 extending out of the syringe barrel 11 passes through and extends to the outside of the pressing sleeve 26. The connecting sleeve 21 has a sliding groove inside the end away from the protective sleeve 22. The driven ring 27 is slidably connected inside the sliding groove. The surface of the driven ring 27 away from the pressing sleeve 26 is in contact with the surface of the syringe barrel 11 away from the syringe needle 12. The limiting spring 28 is disposed inside the sliding groove, and the two ends of the limiting spring 28 are fixedly connected to the outer wall of the syringe barrel 11 and the wall of the sliding groove, respectively.

[0044] The protective sleeve 22 has a through-hole at the center of the end away from the connecting sleeve 21, and the through-hole is located on the movement path of the syringe needle 12.

[0045] The transparent window 24 is used to measure the amount of liquid injected through the syringe barrel 11 during syringe use.

[0046] Further embodiments

[0047] Please see Figures 1 to 3 and Figures 5 to 10 The syringe with anti-puncture function also includes a push assembly disposed on the connecting sleeve 21;

[0048] The pushing component includes a through groove 31 symmetrically formed through the surface of the connecting sleeve 21 away from the protective sleeve 22. Cylindrical connecting rods 32 are fixedly connected to both outer surfaces of the driven ring 27 in an axisymmetric manner with reference to the central axis of the driven ring 27. A positioning ring 33 is inserted into the outer surface of the two cylindrical connecting rods 32 at the ends away from the driven ring 27. A push rod 34 is fixedly connected to one outer surface of the positioning ring 33 in an axisymmetric manner with reference to the central axis of the positioning ring 33. An inclined extrusion piece 35 is fixedly connected to the end of each push rod 34 away from the positioning ring 33. Hemispherical blocks 36 are fixedly connected at equal intervals to the outer surfaces of the two push rods 34 at the ends away from each other. Blocking blocks 37 are fixedly connected at equal intervals to the outer surfaces of the two push rods 34 at the ends away from each other.

[0049] Among them, two cylindrical connecting rods 32 are slidably connected to the inside of two through slots 31, positioning ring 33 is slidably connected to the outer wall of connecting sleeve 21, and two inclined extrusion parts 35 are centrally symmetrically arranged with reference to the center of positioning ring 33.

[0050] Among them, the hemispherical block 36 is located in the middle of the push rod 34, and the blocking block 37 is located on one side surface of the push rod 34. There are two sets of blocking blocks 37, and the two sets of blocking blocks 37 are located on the two push rods 34 respectively. The two sets of blocking blocks 37 are centrally symmetrical with reference to the center of the positioning ring 33, and the blocking blocks 37 located on the same push rod 34 are located between two adjacent hemispherical blocks 36.

[0051] The cylindrical connector is designed to be telescopic, with the end of the cylindrical connector away from the positioning ring 33 being a smooth arc surface, and the positioning ring 33 having an arc groove inside that matches the surface of the cylindrical connector.

[0052] Further embodiments

[0053] Please see Figure 2 , Figure 3 , Figure 5 and Figures 7 to 10 The syringe with anti-puncture function also includes a snap-fit ​​component disposed on the surface of the connecting sleeve 21;

[0054] The snap-fit ​​assembly includes a limiting member 41 that is fixedly connected to the outer wall of the connecting sleeve 21 in an axisymmetric manner. A limiting groove 42 is formed on one side of the outer surface of the limiting member 41. A return spring 43 is fixedly installed inside the limiting groove 42. A limiting ring 44 is slidably connected inside the two limiting grooves 42. The end of the return spring 43 away from the groove wall of the limiting groove 42 is fixedly connected to the outer wall of the limiting ring 44. A connecting groove 45 is formed on the inner surface of the limiting ring 44 in a centrally symmetrical manner with reference to the center of the limiting ring 44. A wedge block 46 is fixedly connected to one side of the groove wall of the connecting groove 45. A spherical locking block 47 is fixedly connected to the center of the groove wall of the connecting groove 45.

[0055] Among them, the limiting ring 44 is rotatably connected to the outer wall of the connecting sleeve 21, the surface of the wedge block 46 away from the groove wall of the connecting groove 45 is set as an inclined plane that fits with the inclined surface of the inclined extrusion part 35, the two wedge blocks 46 are centrally symmetrical with reference to the center of the limiting ring 44, and the two spherical blocks 47 are centrally symmetrical with reference to the center of the limiting ring 44.

[0056] Among them, the outer walls at both ends of the two limiting members 41 together form a connecting track, which is located on the movement path of the push rod 34.

[0057] Both the hemispherical block 36 and the spherical block 47 are made of rubber.

[0058] The overall working process and principle of the above embodiments are as follows:

[0059] Syringe installation:

[0060] When in use, first insert and fix the connecting sleeve 21 and the protective sleeve 22, and then place the syringe barrel 11, syringe needle 12 and syringe piston rod 13 as a whole inside the connecting sleeve 21 and the protective sleeve 22. At this time, the syringe needle 12 is located inside the protective sleeve 22.

[0061] The syringe barrel 11 located inside the protective sleeve 22 and the connecting sleeve 21 is disposed inside the limiting spring 28, and one end of the limiting spring 28 abuts against the outer surface of the syringe barrel 11. Then the driven ring 27 slides from the end of the connecting sleeve 21 away from the protective sleeve 22 into the connecting sleeve 21.

[0062] Then, the knob positioning component 25 is threaded into the inside of the connecting sleeve 21 via the threaded groove inside the connecting sleeve 21. At this time, the end of the pressing sleeve 26 located inside the knob positioning component 25 pushes the driven ring 27, which is slidably connected inside the connecting sleeve 21, to move until the surface of the driven ring 27 abuts against the surface of the syringe barrel 11. As the knob positioning component 25 and the connecting sleeve 21 are installed, the cylindrical connector fixedly connected to the surface of the positioning ring 33 will move to the through groove 31. The cylindrical connector will then extend out of the through groove 31 and be inserted and fixed to the positioning ring 33.

[0063] It should be noted that in the above process, the cylindrical connector is set as a telescopic structure. Therefore, when the cylindrical connector is inside the connecting sleeve 21, it contracts under the squeezing action of the inner wall of the connecting sleeve 21. When the cylindrical connector moves with the driven ring 27 to the through groove 31, the cylindrical connector loses the squeezing action of the inner wall of the connecting sleeve 21 and extends, so that the cylindrical connector extends into the positioning ring 33 and is inserted and installed with the positioning ring 33.

[0064] It should also be noted that the end of the cylindrical connector away from the positioning ring 33 is set as a smooth arc surface, and the positioning ring 33 has an arc groove inside that matches the surface of the cylindrical connector. Therefore, in the subsequent disassembly process, the positioning ring 33 can be separated from the cylindrical connector simply by moving the cylindrical connector in the opposite direction. The smooth arc surface of the cylindrical connector makes it easy for the cylindrical connector to abut against the wall of the through groove 31, thereby causing the cylindrical connector to return to the retracted state, which makes it easy to remove the driven ring 27 from the inside of the connecting sleeve 21.

[0065] When using a syringe:

[0066] When medical staff use the device, they hold the surface of the connecting sleeve 21 and then press the pressing sleeve 26 with their thumb, causing the pressing sleeve 26 to move towards the protective sleeve 22 inside the knob positioning member 25. Since the pressing sleeve 26 abuts against the driven ring 27, the driven ring 27 will slide inside the through groove 31 along with the pressing sleeve 26. At this time, the positioning ring 33, which is connected to the driven ring 27 through the cylindrical connector, will slide on the surface of the connecting sleeve 21.

[0067] At this time, the push rod 34 fixedly connected to the surface of the positioning ring 33 will move accordingly, thereby causing the inclined extrusion member 35 fixedly connected to the push rod 34 to move synchronously. Since the inclined surface of the inclined extrusion member 35 is in contact with the inclined plane of the wedge block 46, and the wedge block 46 is located on the movement path of the inclined extrusion member 35, the inclined extrusion member 35 will push the wedge block 46 to move, and then push the limiting ring 44 fixedly connected to the wedge block 46 to rotate on the surface of the connecting sleeve 21 through the wedge block 46.

[0068] Specific reference Figure 7The limiting ring 44 will rotate counterclockwise on the surface of the connecting sleeve 21, thereby causing the wedge block 46 to deviate from its original trajectory, and causing the spherical locking block 47 located on the limiting ring 44 to move onto the movement trajectory of the push rod 34. In this state, the continued movement of the push rod 34 will cause the hemispherical blocks 36 equidistantly arranged on the surface of the push rod 34 to contact the spherical locking block 47. As the push rod 34 drives the hemispherical blocks 36 to move, the position of the push rod 34 is fixed by the mutual locking of the spherical locking block 47 and the hemispherical blocks 36, thereby fixing the position of the positioning ring 33 and the driven ring 27, and further fixing the position of the syringe barrel 11 inside the connecting sleeve 21.

[0069] It should be noted that during the above process, the limiting ring 44 will move synchronously inside the limiting slide groove 42 during rotation, thereby stretching the return spring 43 set inside the limiting slide groove 42, as shown in the figure. Figure 7 When the limiting ring 44 rotates counterclockwise, the spherical locking block 47 rotates counterclockwise accordingly. As the push rod 34 continues to move, the hemispherical block 36 will come into contact with the surface of the spherical locking block 47, thereby hindering the movement of the hemispherical block 36. Since both the hemispherical block 36 and the spherical locking block 47 are made of rubber, under the continuous pressure applied to the pressing sleeve 26 by medical personnel, the outer surfaces of the hemispherical block 36 and the spherical locking block 47 will deform. At this time, the push rod 34 will continue to move, and the contact between the hemispherical block 36 and the spherical locking block 47 will continue to occur as the pressing sleeve 26 moves.

[0070] During the above process, due to the contact between the syringe barrel 11 and the driven ring 27, the syringe barrel 11 will move synchronously inside the connecting sleeve 21 and the protective sleeve 22. After the medical staff removes the protective sleeve 23 from the protective sleeve 22, the staff continues to press the sleeve 26 until the syringe needle 12 extends out of the protective sleeve 22 and then stops.

[0071] At this time, the push rod 34, which is indirectly moved by pressing the sleeve 26, will move synchronously. In this state, the spherical block 47 is engaged between two adjacent hemispherical blocks 36 on the push rod 34, thereby fixing the position of the push rod 34. Then, the position of the driven ring 27 and the syringe barrel 11 are fixed by the push rod 34. Afterwards, the medical staff can release the fingers that press the sleeve 26, and the syringe barrel 11 will not be displaced inside the protective sleeve 22.

[0072] It should be noted that during the process of fixing the push rod 34 via the hemispherical block 36 and the spherical locking block 47, the spherical locking block 47 is located between two adjacent hemispherical blocks 36. During the movement of the push rod 34, the limiting ring 44 will continuously have a clockwise rotation tendency under the action of the return spring 43. The limiting ring 44 will then drive the spherical locking block 47 to move in the opposite direction. At this time, the blocking block 37 located between two adjacent hemispherical blocks 36 will obstruct the movement of the spherical locking block 47, thereby preventing the limiting ring 44 from reversing and causing the situation where the locking between the hemispherical block 36 and the spherical locking block 47 fails.

[0073] In addition, as the inclined extrusion member 35 pushes the wedge block 46 to move, during the continuous movement of the push rod 34, the surface of the wedge block 46 will be in contact with the surface of the push rod 34 under the action of the limiting ring 44 and the return spring 43, further preventing the failure of the hemispherical block 36 and the spherical block 47 to engage.

[0074] Subsequently, medical staff can inject the solution into the syringe barrel 11 and complete the injection operation by pulling the syringe piston rod 13;

[0075] It should be noted that since the positioning ring 33 and the limiting component 41 are both located on the connecting sleeve 21 at the end away from the protective sleeve 22, the medical staff's hands can be prevented from contacting this part of the structure during the injection operation, and the syringe barrel 11 can be prevented from shifting during the injection process, thus affecting the medical staff's injection operation.

[0076] After the injection is completed, the staff only needs to rotate the limiting ring 44 according to the above process, so that the spherical block 47 and the hemispherical block 36 on the limiting ring 44 are interlocked. At this time, the snap-fit ​​structure formed between the spherical block 47 and the hemispherical block 36 fails. Therefore, under the rebound action of the limiting spring 28, the syringe barrel 11 that is in contact with it will be pushed to retract inside the connecting sleeve 21 and the protective sleeve 22, thereby recovering the syringe.

[0077] Furthermore, in subsequent use, if it is necessary to replace the syringe barrel 11 or the syringe needle 12, simply reverse the above steps to replace the syringe barrel 11 or the syringe needle 12.

[0078] By connecting the sleeve 21 and the protective sleeve 22, a rigid protection can be formed on the outside of the syringe. The rigid shell can effectively prevent medical staff or patients from directly contacting the needle area, reducing the risk of needle stick injury caused by accidental contact (especially in emergency operations or when visibility is obstructed). In addition, in field emergency rescue or disaster sites, the reinforced structure can resist the damage to traditional plastic shells caused by harsh conditions such as drop impact and low temperature brittleness.

[0079] The push rod 34, hemispherical block 36, and spherical locking block 47 can quickly fix the position of the syringe needle 12 while removing it from the protective sleeve 22, reducing the time loss of traditional step-by-step operations and avoiding delays in treatment. In addition, the arc-shaped contact surfaces of the spherical locking block 47 and the hemispherical block 36 form multi-point support, ensuring that the axis of the syringe needle 12 is strictly aligned with the injection direction, reducing the risk of deviation caused by shaking, thereby ensuring that the syringe needle 12 can accurately extend out of the protective sleeve 22 and avoid damage to the syringe needle 12.

[0080] The push rod 34, wedge 46, inclined extrusion member 35, hemispherical block 36, spherical locking block 47 and limiting ring 44 are designed to prevent the hemispherical block 36 and spherical locking block 47 from failing to engage. This allows for quick positioning of the syringe needle 12 extending beyond the length of the protective sleeve 22 while preventing the syringe barrel 11 from failing to stay in place. This also prevents the syringe needle 12 from retracting into the protective sleeve 22 during use. The wedge 46 and inclined extrusion member 35 form a bidirectional pressure path, so even if one component is worn or deformed, it can still maintain a locked state through other components.

[0081] The limiting ring 44, the return spring 43, the wedge block 46, and the spherical locking block 47 are designed so that the locking structure formed between the spherical locking block 47 and the hemispherical block 36 can be quickly released by simply rotating the limiting ring 44 in the reverse direction. This allows the syringe needle 12 to retract into the protective sleeve 22, thus completing the rapid retrieval of the syringe needle 12 and preventing the syringe needle 12 from pricking medical staff or patients. In addition, the potential energy stored in the return spring 43 is converted into precise mechanical kinetic energy, which actively pushes the syringe needle 12 back into the protective sleeve 22 instead of relying on gravity to fall naturally, ensuring that it can be completely retracted even in tilted or vibrating environments.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A syringe with anti-puncture function, comprising a syringe barrel (11), a syringe needle (12) fixedly mounted at one end of the syringe barrel (11), and a syringe piston rod (13) slidably mounted inside the syringe barrel (11), characterized in that: It also includes a protective component disposed outside the syringe barrel (11); The protective assembly includes a connecting sleeve (21) that fits against the outer wall of the syringe barrel (11), a protective sleeve (22) that is snapped onto one end of the connecting sleeve (21), a protective sleeve head (23) that is inserted into the outer surface of the protective sleeve (22) away from the connecting sleeve (21), and transparent windows (24) that are fixedly installed on both outer walls of the protective sleeve (22) in an axially symmetrical manner with reference to the central axis of the connecting sleeve (21). A knob positioning component (25) is threaded onto the inner wall of the connecting sleeve (21) away from the protective sleeve (22). A pressing sleeve (26) is slidably connected inside the knob positioning component (25). A driven ring (27) is fitted onto the inner surface of the pressing sleeve (26) inside the knob positioning component (25). A limit spring (28) is sleeved onto the outer surface of one end of the syringe barrel (11). It also includes a pushing assembly set on the connecting sleeve (21). The pushing assembly includes a through groove (31) symmetrically opened through the surface of the connecting sleeve (21) away from the protective sleeve (22). The outer surfaces of both sides of the driven ring (27) are fixedly connected with columnar connecting rods (32) in an axisymmetric manner with reference to the central axis of the driven ring (27). The outer surfaces of the two columnar connecting rods (32) away from the driven ring (27) are jointly inserted and installed with a positioning ring (33). The outer surface of one side of the positioning ring (33) is fixedly connected with a push rod (34) in an axisymmetric manner with reference to the central axis of the positioning ring (33). The push rods (34) away from the positioning ring (33) are fixedly connected with inclined extrusion parts (35). The outer surfaces of the two push rods (34) away from each other are fixedly connected with hemispherical blocks (36) at equal intervals. The outer surfaces of the two push rods (34) away from each other are fixedly connected with blocking blocks (37) at equal intervals. It also includes a snap-fit ​​assembly disposed on the surface of the connecting sleeve (21). The snap-fit ​​assembly includes a limiting member (41) fixedly connected to the outer wall of the connecting sleeve (21) in an axisymmetric manner. A limiting groove (42) is opened on one side of the outer surface of the limiting member (41). A return spring (43) is fixedly installed inside the limiting groove (42). A limiting ring (44) is slidably connected inside the two limiting grooves (42). The end of the return spring (43) away from the groove wall of the limiting groove (42) is fixedly connected to the outer wall of the limiting ring (44). A connecting groove (45) is opened symmetrically with reference to the center of the limiting ring (44). A wedge (46) is fixedly connected to one side of the groove wall of the connecting groove (45). A spherical snap-fit ​​block (47) is fixedly connected to the center of the groove wall of the connecting groove (45).

2. The syringe with anti-puncture function according to claim 1, characterized in that: The pressing sleeve (26) is located outside the syringe piston rod (13). One end of the syringe piston rod (13) extends out of the syringe barrel (11), and the end of the syringe piston rod (13) extending out of the syringe barrel (11) passes through and extends to the outside of the pressing sleeve (26). A sliding groove is provided inside the end of the connecting sleeve (21) away from the protective sleeve (22). The driven ring (27) is slidably connected inside the sliding groove. The surface of the driven ring (27) away from the pressing sleeve (26) is in contact with the surface of the syringe barrel (11) away from the syringe needle (12). The limiting spring (28) is located inside the sliding groove, and the two ends of the limiting spring (28) are fixedly connected to the outer wall of the syringe barrel (11) and the wall of the sliding groove, respectively.

3. A syringe with anti-puncture function according to claim 1, characterized in that: The protective sleeve (22) has a through-hole at the center of the end away from the connecting sleeve (21), and the through-hole is located on the movement path of the syringe needle (12).

4. A syringe with anti-puncture function according to claim 1, characterized in that: Two cylindrical connecting rods (32) are slidably connected to the inside of two through slots (31), and the positioning ring (33) is slidably connected to the outer wall of the connecting sleeve (21). Two inclined extrusion parts (35) are arranged in a centrally symmetrical manner with reference to the center of the positioning ring (33).

5. A syringe with anti-puncture function according to claim 1, characterized in that: A hemispherical block (36) is located in the middle of the push rod (34), and a blocking block (37) is located on one side surface of the push rod (34). There are two sets of blocking blocks (37), and the two sets of blocking blocks (37) are located on the two push rods (34) respectively. The two sets of blocking blocks (37) are centrally symmetrical with reference to the center of the positioning ring (33), and the blocking blocks (37) on the same push rod (34) are located between two adjacent hemispherical blocks (36).

6. A syringe with anti-puncture function according to claim 1, characterized in that: The limiting ring (44) is rotatably connected to the outer wall of the connecting sleeve (21). The surface of the wedge block (46) away from the groove wall of the connecting groove (45) is set as an inclined plane that fits against the inclined surface of the inclined extrusion part (35). The two wedge blocks (46) are centrally symmetrical with reference to the center of the limiting ring (44). The two spherical blocks (47) are centrally symmetrical with reference to the center of the limiting ring (44).

7. A syringe with anti-puncture function according to claim 1, characterized in that: The outer walls at both ends of the two limiting members (41) together form a connecting track, which is located on the movement path of the push rod (34).

Images