Needle stick injury prevention syringe

Abstract

The utility model discloses a kind of needle stick injury type injection needle cylinder, including needle cylinder and the piston assembly cooperation with needle cylinder, the needle cylinder head end is provided with injection nozzle, detachably set up injection needle assembly on the injection nozzle, the injection needle assembly includes needle and connecting sleeve, the injection nozzle is detachably connected with needle through connecting sleeve, connecting sleeve is provided with the connecting structure for being connected with injection nozzle when connecting sleeve rotates in clockwise direction and the locking structure for making needle quickly retract to the inside of needle cylinder when connecting sleeve rotates in counterclockwise direction, connecting sleeve and injection nozzle between being provided with the loading structure for applying force to needle to limit needle to shake or retract when connecting sleeve does not rotate. The utility model solves the problem that needle is in exposed state after traditional injection needle cylinder is used, and needle stick injury occurs when operator is operated, stored or handled.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a needle-puncture-proof injection syringe. Background Technology

[0002] Medical injection devices are fundamental tools widely used in clinical treatment. Among them, the injection syringe is a core component, and its safety and reliability are directly related to the health of medical staff and patients. Traditional injection syringes typically consist of a syringe body, a piston assembly, and a detachably connected injection needle assembly. The injection needle assembly (including the needle tip) is connected to the injection nozzle of the syringe via a simple plug-in or threaded structure. However, traditional injection syringes pose significant safety hazards in actual use: Firstly, the needle tip is completely exposed to the external environment after use. When medical staff clean up the syringe after operation, dispose of medical waste, or experience accidental collisions, they are highly susceptible to needlestick injuries due to accidental contact with the exposed needle tip. Statistics show that needlestick injuries in medical settings are one of the main routes of infection for medical staff with blood-borne diseases (such as hepatitis B, hepatitis C, and HIV), seriously threatening occupational safety. Secondly, the connection structure between the traditional needle tip and the syringe is not stable enough. Some products rely only on simple interference fits or shallow threads for fixation. During injection, uneven operating force or patient movement may cause the needle tip to wobble, affecting injection accuracy and even causing additional pain to the patient. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a needle-puncture-proof injection syringe, which solves the problem that the needle tip of traditional injection syringes is exposed after use, making it easy for operators to accidentally touch the needle tip and cause needle puncture injuries during operation, storage, or handling.

[0004] To achieve the above objectives, this utility model provides a needle-puncture-proof injection syringe, including a syringe and a piston assembly that cooperates with the syringe. The syringe tip is provided with an injection nozzle, and an injection needle assembly is detachably mounted on the injection nozzle. The injection needle assembly includes a needle tip and a connecting sleeve. The injection nozzle and the needle tip are detachably connected via the connecting sleeve. The connecting sleeve is provided with a connecting structure for connecting with the injection nozzle when the connecting sleeve rotates clockwise and a locking structure for quickly retracting the needle tip into the syringe when the connecting sleeve rotates counterclockwise. A loading structure is provided between the connecting sleeve and the injection nozzle for applying a force to the needle tip to limit the needle tip from shaking or retracting when the connecting sleeve is not rotating.

[0005] The advantages of adopting the above technical solution are as follows: By setting a structure on the connecting sleeve that connects to the injection nozzle when rotating clockwise, the injection needle assembly and syringe are stably assembled to meet normal injection requirements; while the locking structure that causes the needle to retract quickly when rotating counterclockwise can quickly hide the needle after use, preventing operators from accidentally touching it and causing needlestick injuries; the loading structure between the connecting sleeve and the injection nozzle can limit the shaking or retraction of the needle when the connecting sleeve is not rotating, ensuring the stability of the needle during injection, improving the accuracy and safety of operation, and effectively solving the problems of high needlestick injury risk and insufficient needle stability of traditional injection syringes.

[0006] The present invention further comprises: a connecting hole is provided at the end of the connecting sleeve along its height direction; the connecting structure includes a first threaded groove on the outer peripheral wall of the injection nozzle and a second threaded groove on the inner peripheral wall of the connecting hole; the first threaded groove and the second threaded groove are threadedly connected to realize the connection between the connecting sleeve and the injection nozzle; a through hole for the needle to pass through is provided at the beginning end face of the connecting sleeve; an injection hole for communicating with the inside of the syringe is provided at the beginning end of the injection nozzle along the length direction of the injection nozzle; the through hole, the connecting hole and the injection hole are coaxially aligned and connected.

[0007] The advantages of adopting the above technical solution are: the connecting hole at the end of the connecting sleeve is connected to the injection nozzle by the thread of the first thread groove and the second thread groove, which facilitates the replacement and installation of the injection needle assembly and improves the ease of use; the perforation, connecting hole and injection hole are coaxially aligned and connected to ensure smooth flow of the drug solution, avoid drug blockage or leakage during the injection process, and ensure the normal progress of the injection.

[0008] This utility model further includes: the injection needle assembly includes a partition plate disposed at the tail of the needle tip, the tail of the needle tip is coaxially connected to and penetrates the center of the partition plate, the outer wall of the partition plate faces the injection hole opening, the partition plate is disc-shaped and its diameter is smaller than the injection hole diameter, the loading structure includes two limiting plates disposed on the inner peripheral wall of the injection hole, the two limiting plates are disposed opposite to each other, and limiting grooves are formed on the outer wall of the partition plate corresponding to the positions of the two limiting plates, with limiting blocks protruding in the limiting grooves, the two limiting plates respectively abutting and cooperating with the two limiting blocks, the limiting plates cooperate with the locking structure so that when the connecting sleeve rotates in a counterclockwise direction, the locking structure drives the limiting plates to separate from the limiting grooves, causing the partition plate to quickly retract into the injection hole.

[0009] The advantages of adopting the above technical solution are as follows: In the above technology, the cooperation between the partition, the limiting plate, and the limiting block restricts the movement of the partition by the abutment between the limiting plate and the limiting block when the connecting sleeve is not rotating. This effectively limits the shaking or unexpected retraction of the needle, ensuring the stability of the needle during injection. At the same time, when connecting the connecting sleeve to the injection nozzle, the limiting plate and the limiting block can be aligned first. The operator pushes the syringe to make the limiting plate continuously apply force to the limiting block, and then rotates the syringe to make the injection nozzle rotate relative to the connecting sleeve, thereby restricting the movement of the partition. When the connecting sleeve rotates counterclockwise, the locking structure drives the limiting plate to separate from the limiting groove, allowing the partition to quickly retract into the injection hole, realizing the automatic hiding of the needle and avoiding needlestick injuries.

[0010] The present invention further includes a loading spring in the loading structure. The loading spring is positioned between the inner wall of the partition and the bottom wall of the connecting hole. The end of the loading spring is coaxially connected to the bottom wall of the connecting hole, and the beginning of the loading spring is in contact with the inner wall of the partition.

[0011] The advantages of adopting the above technical solution are: the loading spring is set between the inner wall of the partition and the bottom wall of the connecting hole. When the connecting sleeve is not rotating, the spring force applies pressure to the partition, further restricting the needle movement and ensuring that the needle remains stable during injection. After use, the spring force can also assist the partition to retract quickly, and in conjunction with the locking structure, the needle can be hidden more smoothly, improving overall safety. In the above technology, when connecting the connecting sleeve and the injection nozzle, the limiting plate and the limiting block can be aligned first. The operator pushes the syringe so that the limiting plate continuously applies force to the limiting block. Then, the syringe is rotated so that the injection nozzle rotates relative to the connecting sleeve. When the injection nozzle rotates relative to the connecting sleeve, the radial force applied by the limiting plate will be transmitted to the partition. Since the partition cooperates with the loading spring, when the injection nozzle rotates relative to the connecting sleeve, the partition moves towards the perforation direction and squeezes the loading spring. The force applied by the deformation of the loading spring will act on the partition to achieve an energy storage effect. When the partition cooperates with the locking structure, this energy storage effect will push the partition to quickly retract into the syringe, thereby realizing the rapid retraction of the needle.

[0012] The present invention further includes the following: the locking structure includes two grooves formed on the outer wall of the partition, the two grooves correspond one-to-one with the two limiting grooves and are connected, the grooves penetrate the partition and are connected to the injection hole, and the radial cross-sectional area of ​​the grooves is larger than the radial cross-sectional area of ​​the limiting block.

[0013] The advantages of adopting the above technical solution are: the groove setting in the above technology, and its radial cross-sectional area is larger than the radial cross-sectional area of ​​the limiting block, so that when the connecting sleeve rotates counterclockwise, the limiting block can smoothly enter the groove from the limiting groove, realize the rapid separation of the limiting plate and the limiting groove, ensure that the partition is no longer limited by the limiting plate, and can quickly retract into the injection hole without obstruction, making the needle hiding process smoother and more reliable, and effectively avoiding the risk of needle puncture injury.

[0014] The present invention is further provided that: the outer wall of the limiting block and the inner wall of the limiting groove are connected by a smooth curved surface and a stepped surface is formed, and the side wall of the limiting plate is abutted against the stepped surface.

[0015] The advantages of adopting the above technical solution are: the smooth curved surface and stepped surface design between the outer wall of the limiting block and the inner wall of the limiting groove in the above technology make the contact between the limiting plate and the stepped surface tighter and more stable. This allows the torque force applied by the operator to the syringe during the relative rotation and connection of the connecting sleeve and the injection nozzle to act on the stepped surface through the limiting plate, thereby driving the partition to rotate relative to each other. This prevents the partition from slipping and causing the limiting plate to move out of the groove, thus avoiding the unexpected needle retraction phenomenon. That is, when the connecting sleeve rotates clockwise, the limiting plate can abut against the stepped surface, thereby improving the connection speed and stability between the connecting sleeve and the injection nozzle and avoiding the problem of unexpected needle retraction.

[0016] The present invention further includes: a sealing ring is attached to the inner peripheral wall of the connecting hole for abutting against the outer peripheral wall of the partition when the loading spring is in the maximum compression state, and the sealing ring is made of rubber.

[0017] The advantage of adopting the above technical solution is that the sealing ring on the inner wall of the connecting hole in the above technology, when the loading spring is in the maximum compression state (that is, before the needle has retracted into the injection hole), abuts against the outer wall of the partition to form a sealing effect, so that the medicine can only flow into the patient's body through the needle, preventing leakage or waste of the medicine.

[0018] The present invention further includes the following feature: the connecting sleeve is made of a highly transparent material.

[0019] The advantages of adopting the above technical solution are: the connecting sleeve is made of a highly transparent material, which makes it easy for operators to clearly observe the situation near the needle during the injection process, such as the flow of the medicine and whether there are air bubbles, which helps to detect problems in time and make adjustments, improve the accuracy and reliability of the injection operation, and at the same time better ensure the safety of the injection process. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of the present invention;

[0021] Figure 2for Figure 1 Remove the 3D view of the connecting sleeve;

[0022] Figure 3 This is a three-dimensional view of the engagement state of the limiting plate and the limiting block in this utility model;

[0023] Figure 4 This is a three-dimensional view of the limiting plate and the limiting block in the separated state in this utility model;

[0024] Figure 5 This is a three-dimensional view of the connecting sleeve in this utility model;

[0025] Figure 6 This is a simplified schematic diagram of the sealing ring and the partition plate not being fitted in this utility model.

[0026] Figure 7 This is a simplified schematic diagram showing the fit between the sealing ring and the partition in this utility model. Detailed Implementation

[0027] This utility model provides a needle-puncture-proof injection syringe 1, including a syringe 1 and a piston assembly 11 that cooperates with the syringe 1. The syringe 1 has an injection nozzle 2 at its tip. An injection needle assembly is detachably mounted on the injection nozzle 2. The injection needle assembly includes a needle tip 12 and a connecting sleeve 3. The injection nozzle 2 and the needle tip 12 are detachably connected via the connecting sleeve 3. The connecting sleeve 3 has a connecting structure for connecting with the injection nozzle 2 when the connecting sleeve 3 rotates clockwise and a locking structure for quickly retracting the needle tip 12 into the syringe 1 when the connecting sleeve 3 rotates counterclockwise. A loading structure is provided between the connecting sleeve 3 and the injection nozzle 2 to apply force to the needle tip 12 to limit the shaking or retraction of the needle tip 12 when the connecting sleeve 3 is not rotating. The connecting sleeve 3 has a connecting hole 31 at its end along its height direction. The connecting structure includes a first threaded groove 21 on the outer peripheral wall of the injection nozzle 2 and a second threaded groove 32 on the inner peripheral wall of the connecting hole 31. The first threaded groove 21 and the second threaded groove 32 are threadedly connected to connect the connecting sleeve 3 and the injection nozzle 2. The starting end face of the connecting sleeve 3 has a through hole 33 for the needle 12 to pass through. The starting end of the injection nozzle 2 has an injection hole 22 through its length direction for communicating with the inside of the syringe 1. The through hole 33, the connecting hole 31, and the injection hole 22 are coaxially aligned and connected. The injection needle assembly also includes a partition 4 disposed at the tail of the needle 12. The tail of the needle 12 is coaxially connected to the center of the partition 4. The partition 4 is disposed through the injection hole 22, with its outer wall facing the opening. The partition 4 is disc-shaped and its diameter is smaller than the diameter of the injection hole 22. The loading structure includes two limiting plates 221 disposed on the inner circumferential wall of the injection hole 22, facing each other. Limiting grooves 41 are formed on the outer wall of the partition 4 corresponding to the positions of the two limiting plates 221. Limiting blocks 42 protrude from the limiting grooves 41. The two limiting plates 221 abut against the two limiting blocks 42 respectively. The limiting plates 221 cooperate with a locking structure so that when the connecting sleeve 3 rotates counterclockwise, the locking structure drives the limiting plates 221 to separate from the limiting grooves 41, causing the partition 4 to quickly retract into the injection hole 22. The system also includes a loading spring 34, which is positioned between the inner wall of the partition 4 and the bottom wall of the connecting hole 31. The end of the loading spring 34 is coaxially connected to the bottom wall of the connecting hole 31, and the beginning of the loading spring 34 is in contact with the inner wall of the partition 4. The locking structure includes two grooves 43 formed on the outer wall of the partition 4. The two grooves 43 correspond one-to-one with two limiting grooves 41 and are connected. The grooves 43 penetrate the partition 4 and are connected to the injection hole 22. The radial cross-sectional area of ​​the grooves 43 is larger than the radial cross-sectional area of ​​the limiting block 42. The outer wall of the limiting block 42 and the inner wall of the limiting groove 41 are connected by a smooth curved surface and form a stepped surface 44. The side wall of the limiting plate 221 abuts against the stepped surface 44.The inner circumferential wall of the connecting hole 31 is fitted with a sealing ring 5 for abutting against the outer circumferential wall of the partition 4 when the loading spring 34 is in its maximum compressed state. The sealing ring 5 is made of rubber, and the connecting sleeve 3 is made of a high-transparency material. Detailed implementation method:

[0029] 1. Align the second threaded groove of the connecting sleeve with the first threaded groove on the outer peripheral wall of the injection nozzle, and align the limiting plate with the limiting block. Rotate the syringe counterclockwise, which is equivalent to rotating the connecting sleeve clockwise. At this time, the side wall of the limiting plate abuts against the stepped surface. The injection needle assembly and the injection nozzle of the syringe are stably assembled through the threaded connection. At this time, the perforation, connecting hole and injection hole are coaxially connected to ensure smooth flow of the drug solution.

[0030] 2. Check if the connecting sleeve is installed in place. At this time, the limiting plate in the loading structure abuts against the limiting block on the partition. The loading spring is compressed as the connecting sleeve and the injection nozzle are connected. That is, during the connection between the connecting sleeve and the injection nozzle, the limiting plate will drive the partition to move towards the perforation direction, which will cause the partition to squeeze the loading spring. When the loading spring is compressed to the maximum compression state (i.e., the maximum energy storage state), it will apply force to the partition and the bottom wall of the connecting hole respectively, thereby limiting the rotation of the partition and thus limiting the wobbling of the needle, ensuring the stability of the needle.

[0031] 3. Push the piston assembly, and the liquid medicine is injected into the patient's body through the injection hole, connection hole and perforation, and the needle. The highly transparent connecting sleeve makes it easy to observe the injection situation.

[0032] 4. After injection, rotate the syringe clockwise, causing the connecting sleeve to rotate counterclockwise relative to the injection nozzle, triggering the locking mechanism. During the separation of the connecting sleeve from the injection nozzle, the limiting plate will translate relative to the limiting block, gradually moving the limiting plate to the disengagement position until it no longer abuts against the limiting block. At this point, the limiting plate no longer exerts force on the partition through contact with the limiting block, meaning the partition can move along the axis of the injection hole. This allows the force stored in the deformation of the loading spring to act directly on the partition, driving it to retract quickly and retract the needle rapidly into the syringe, preventing needle prick. The entire process, through the cooperation of various structures, achieves a safe, stable, and convenient injection operation.

[0033] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A needlestick-proof injection syringe, comprising a syringe barrel and a piston assembly cooperating with the syringe barrel, characterized in that: The syringe tip is provided with an injection nozzle, and an injection needle assembly is detachably mounted on the injection nozzle. The injection needle assembly includes a needle and a connecting sleeve. The injection nozzle and the needle are detachably connected via the connecting sleeve. The connecting sleeve is provided with a connecting structure for connecting with the injection nozzle when the connecting sleeve rotates clockwise and a locking structure for quickly retracting the needle into the syringe when the connecting sleeve rotates counterclockwise. A loading structure is provided between the connecting sleeve and the injection nozzle for applying a force to the needle to limit the shaking or retraction of the needle when the connecting sleeve is not rotating.

2. The needle-puncture-resistant injection syringe according to claim 1, characterized in that: The connecting sleeve has a connecting hole at its end along its height direction. The connecting structure includes a first threaded groove on the outer peripheral wall of the injection nozzle and a second threaded groove on the inner peripheral wall of the connecting hole. The first threaded groove and the second threaded groove are threaded together to connect the connecting sleeve and the injection nozzle. The starting end face of the connecting sleeve has a through hole for the needle to pass through. The starting end of the injection nozzle has an injection hole for communicating with the inside of the syringe along the length direction of the injection nozzle. The through hole, the connecting hole and the injection hole are coaxially aligned and connected.

3. The needle-puncture-resistant injection syringe according to claim 2, characterized in that: The injection needle assembly also includes a partition plate disposed at the tail of the needle tip. The tail of the needle tip is coaxially connected to and passes through the center of the partition plate. The outer wall of the partition plate faces the injection hole opening. The partition plate is disc-shaped and its diameter is smaller than that of the injection hole. The loading structure includes two limiting plates disposed on the inner peripheral wall of the injection hole. The two limiting plates are disposed opposite to each other. Limiting grooves are formed on the outer wall of the partition plate corresponding to the positions of the two limiting plates. Limiting blocks protrude from the limiting grooves. The two limiting plates are respectively abutted and cooperate with the two limiting blocks. The limiting plates cooperate with the locking structure so that when the connecting sleeve rotates counterclockwise, the locking structure drives the limiting plates to separate from the limiting grooves, causing the partition plate to quickly retract into the injection hole.

4. A needle-puncture-resistant injection syringe according to claim 3, characterized in that: The loading structure also includes a loading spring, which is positioned between the inner wall of the partition and the bottom wall of the connecting hole. The end of the loading spring is coaxially connected to the bottom wall of the connecting hole, and the beginning of the loading spring is in contact with the inner wall of the partition.

5. A needle-puncture-resistant injection syringe according to claim 4, characterized in that: The locking structure includes two grooves formed on the outer wall of the partition. The two grooves correspond one-to-one with the two limiting grooves and are connected. The grooves penetrate the partition and are connected to the injection hole. The radial cross-sectional area of ​​the grooves is larger than the radial cross-sectional area of ​​the limiting block.

6. A needle-puncture-resistant injection syringe according to claim 5, characterized in that: The outer wall of the limiting block and the inner wall of the limiting groove are connected by a smooth curved surface and form a stepped surface, and the side wall of the limiting plate is abutted against the stepped surface.

7. A needle-puncture-resistant injection syringe according to claim 5, characterized in that: The inner circumferential wall of the connecting hole is provided with a sealing ring for abutting against the outer circumferential wall of the partition when the loading spring is in the maximum compression state. The sealing ring is made of rubber.

8. A needle-puncture-resistant injection syringe according to claim 1, characterized in that: The connecting sleeve is made of a highly transparent material.

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