Anti-stabbing device for insulin pen injection

Abstract

The invention belongs to the technical field of medical instruments, and particularly provides an insulin pen injection puncture prevention device which comprises a metering regulator, a refill frame mechanism, a clamping type injection mechanism and a springing type needle head protection assembly. The refill frame mechanism is installed at the end, close to the piston rod, of the metering regulator, the clamping type injection mechanism is arranged at the end, away from the piston rod, of the refill frame mechanism in a clamped mode, and the springing type needle protection assembly is arranged on the outer side of the clamping type injection mechanism in a sleeving mode. A pre-acting principle is combined with a springing structure, and in the whole process of insulin injection and disassembly, assembly and replacement of a clamping type injection mechanism, an injection needle is protected and coated, so that the needle is prevented from being exposed to cause the pricking injury risk or environmental pollution; an assembly type structure is adopted, the operation of replacing the clamping type injection mechanism is convenient and fast, the structure of an existing insulin pen is improved, and the cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and specifically refers to a stab-prevention device for insulin pen injection. Background Art

[0002] Diabetic patients need to inject insulin regularly. Insulin pens are commonly used treatment tools for diabetic patients. When injecting, a medicine cartridge is loaded, and the single-use dose can be adjusted, which is simple and easy to operate. However, during its use, the needle needs to be installed and disassembled each time, posing a high risk of needle stick injury. Especially after injection, the operation of putting the needle cap back on with one hand is difficult, and the needle cap is likely to roll or fall off, increasing the risk of needle stick injury, which may lead to blood-borne infections such as hepatitis B, hepatitis C, and AIDS, posing a serious threat to the health of medical staff.

[0003] Existing stab-prevention devices for insulin pens cannot keep the needle inside the protection device at all times before and after injection, posing a risk of needle stick injury. In addition, the exposed needle is more likely to be contaminated by the environment. Moreover, it is difficult to operate when installing and disassembling the needle. When installing the needle by screwing, the needle is more likely to bend and deform. Summary of the Invention

[0004] To solve the above existing problems, the present invention provides a stab-prevention device for insulin pen injection. By using the pre-action principle combined with an elastic structure, an elastic needle protection device is set. During the whole process of insulin injection and assembling, disassembling, and replacing the snap-in injection mechanism, the injection needle is under protection and wrapping, avoiding exposure to cause the risk of needle stick injury or environmental pollution; adopting an assembled structure, the operation of replacing the snap-in injection mechanism is convenient, and it is improved on the existing insulin pen structure with low cost.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A stab-prevention device for insulin pen injection provided by the present invention includes a dose regulator. A piston rod is arranged inside the dose regulator. It also includes a cartridge holder mechanism, a snap-in injection mechanism, and an elastic needle protection assembly. The cartridge holder mechanism is installed at one end of the dose regulator close to the piston rod. A medicine cartridge is installed inside the cartridge holder mechanism. The snap-in injection mechanism is snap-fitted at one end of the cartridge holder mechanism away from the piston rod. The elastic needle protection assembly is engaged at one end of the cartridge holder mechanism away from the piston rod. The elastic needle protection assembly is sleeved outside the snap-in injection mechanism. Among them, the elastic needle protection assembly includes an elastic cover shell mechanism, a grasping connection mechanism, and a control mechanism. The elastic cover shell mechanism is engaged on the cartridge holder mechanism. The grasping connection mechanism is rotatably arranged at one end of the elastic cover shell mechanism close to the cartridge holder mechanism. The control mechanism is slidably arranged inside the elastic cover shell mechanism and is arranged outside the grasping connection mechanism.

[0006] Furthermore, the bouncing housing mechanism includes a support disk, a threaded ring, a telescopic connecting ring, a pressing ring, and a bouncing spring. The support disk is movably arranged at one end of the refill holder mechanism away from the piston rod. The threaded ring is coaxially arranged on the side of the support disk close to the refill holder mechanism. The telescopic connecting ring is coaxially and internally embedded on the side of the support disk away from the threaded ring. The telescopic connecting ring adopts a three-stage telescopic structure. The pressing ring is coaxially connected to the telescopic end of the telescopic connecting ring. The threaded ring is arranged outside the pressing ring. The bouncing spring is connected between the pressing ring and the support disk, and the bouncing spring is sleeved outside the telescopic connecting ring. The inner side of the pressing ring is connected with a pressing slope, and the pressing slope tapers inwards towards the inner side of the pressing ring in an inverted cone shape. A through-needle hole is provided through the lower end of the pressing slope.

[0007] Furthermore, the grasping connection mechanism includes a plugging ring, plugging protrusions, and magnetic beads. The plugging ring is coaxially rotatably arranged on the side of the support disk close to the refill holder mechanism. The plugging ring is arranged inside the threaded ring. The plugging protrusions are circumferentially and evenly arranged on the side of the plugging ring away from the support disk. The plugging protrusions are arranged below the threaded ring. The interior of the plugging protrusion is hollow, and the lower part of the plugging protrusion is arc-shaped. The magnetic beads are internally and movably embedded on the inner side wall of the plugging protrusion. A spring is arranged inside the plugging protrusion, and the spring is connected between the magnetic bead and the inner wall of the plugging protrusion. The spring is coated with an insulating coating to avoid being affected by the magnetic beads.

[0008] Furthermore, the control mechanism includes a sliding ring, a magnetic ring, and a moving plate. The sliding ring is movably arranged between the plugging ring and the threaded ring. The magnetic ring is internally embedded on the inner wall of the sliding ring facing the plugging ring. The moving plates are symmetrically arranged on the upper part of the sliding ring. The moving plates penetrate and slide on the support disk. The moving plates are arranged outside the pressing ring. A support plate is rotatably arranged on the outer side wall of the moving plate away from the pressing ring. The support plate is arranged in a cuboid shape. When the support plate rotates to the vertical state, the magnetic ring slides to the outside of the plugging ring. When the support plate rotates to the horizontal state, the moving plate is pressed down to move the sliding ring downwards, and the magnetic ring slides to the outside of the plugging protrusion. The magnetic ring magnetically adsorbs the magnetic beads, and then the magnetic beads slide into the plugging protrusion.

[0009] Furthermore, the clamping injection mechanism includes an injection seat, a positioning seat, a conical platform, and a needle mechanism. The injection seat is clamped and arranged at one end of the refill holder mechanism away from the piston rod. The outer diameter of the injection seat is equal to the outer diameter of the plugging ring. The upper part of the injection seat is circumferentially and arrayed with clamping blocks, and the upper ends of the clamping blocks are in a sharp cone shape. The positioning seat is arranged inside the injection seat. The outer side wall of the positioning seat is circumferentially and arrayed with clamping grooves, and the clamping grooves and the clamping blocks are arranged staggeredly. The circumferentially arrayed clamping blocks and the circumferentially arrayed plugging protrusions are movably and staggeredly clamped. The magnetic beads are movably clamped with the clamping grooves. The conical platform is arranged inside the positioning seat. When the magnetic beads are clamped with the clamping grooves, the inner side of the support disk is in contact with the sloping side wall of the conical platform. The needle mechanism is coaxially arranged on the conical platform; Further, the needle mechanism includes an injection needle, a first protective sleeve, and a second protective sleeve. The injection needle is disposed through the center of the conical platform, and the lower end of the injection needle is in the same plane as the bottom wall of the injection seat. The first protective sleeve is movably sleeved on the lower end of the injection needle, and the first protective sleeve is disposed inside the conical platform. A protective spring is connected between the first protective sleeve and the conical platform, and the protective spring is sleeved outside the injection needle. The second protective sleeve is sleeved on the upper end of the injection needle, and the second protective sleeve is disposed above the conical platform. The diameter of the needle-passing hole is smaller than the inner diameter of the second protective sleeve, and the lower end of the pressing slope is in contact with the upper end of the second protective sleeve.

[0010] Preferably, a soft cotton sleeve is provided inside the second protective sleeve. The soft cotton sleeve is made of foamed cotton material with resilience. The soft cotton sleeve is sleeved outside the injection needle. Circumferentially symmetrically penetrating around-dividing grooves are provided on the outer side wall of the second protective sleeve along the circumferential direction. Vertical dividing grooves are vertically arrayed on the upper part of the around-dividing grooves, and the vertical dividing grooves penetrate through the second protective sleeve. The height of the second protective sleeve is higher than the upper end of the injection needle, and the second protective sleeve is made of PE plastic material for easy tearing. During specific use, take out a snap-on injection mechanism and place it in a medical care tray with the conical platform facing upwards. In the initial state, the first protective sleeve protects the end of the injection needle inside the injection seat, and the second protective sleeve protects the end of the injection needle above the conical platform. Then, hold the support plate and press the grasping connection mechanism downwards onto the snap-on injection mechanism. The arc-shaped insertion convex blocks at the lower part are inserted between the snap blocks. The insertion ring rotates adaptively relative to the support plate, and the circumferentially arrayed snap blocks and the circumferentially arrayed insertion convex blocks are interlocked and engaged. The magnetic beads slide into the insertion convex blocks under the extrusion of the side wall edge of the positioning seat. When the magnetic beads slide to the snap groove, they pop out under the elastic action of the spring and are engaged and positioned with the snap groove. At this time, the inner side of the support plate is in contact with the slope side wall of the conical platform, the lower end of the pressing slope is in contact with the upper end of the second protective sleeve, and the entire injection needle is in a covered state. The snap-on injection mechanism and the spring-actuated needle protection assembly can be installed by pressing vertically, which is convenient for operation. During injection, the spring-actuated spring is compressed, the pressing ring approaches the support plate, and the lower end of the pressing slope presses the upper end of the second protective sleeve. The second protective sleeve made of PE plastic material is torn along the vertical dividing groove under the extrusion and is inclined and opened along the inner wall of the pressing slope until the second protective sleeve is torn to the around-dividing groove and opened outwards. The soft cotton sleeve is compressed downwards along the injection needle, and the injection needle extends out from the needle-passing hole. After the injection needle pierces the patient's skin, press the injection button to inject insulin, and then pull it out after ten seconds. When pulling out, under the elastic action of the spring-actuated spring, the pressing ring pops up, the telescopic connecting ring stretches and covers the injection needle again, and the lower end of the pressing slope no longer presses the soft cotton sleeve. The soft cotton sleeve slowly recovers to cover the injection needle and cleans the residual blood or medicine on the injection needle during this process. When disassembling the snap - in injection mechanism, take the elastic needle protection assembly with the snap - in injection mechanism above the sharps container, rotate the support plate to make the support plate in a horizontal state and press the moving plate. The sliding ring moves downward, making the magnetic ring move to the outside of the magnetic bead. The magnetic bead is attracted by the magnetism of the magnetic ring and retracts into the insertion bump, no longer restricting the snap - in injection mechanism. Under the action of gravity, the whole snap - in injection mechanism falls into the sharps container.

[0011] Further, the cartridge holder mechanism includes a snap - ring, side plates, a boss and a connecting sleeve. The snap - ring is movably installed on the metering regulator. The side plates are symmetrically arranged at one end of the snap - ring away from the metering regulator. One side of the side plates is linearly and arrayed with surplus benchmarks. The boss is connected to the end of the side plates away from the snap - ring. The boss is annular, and the outer diameter of the boss is equal to the inner diameter of the injection seat. The connecting sleeve is arranged outside the boss, and the inner side of the connecting sleeve is provided with threads, and the connecting sleeve meshes with the threaded ring.

[0012] Optionally, an adjusting knob and an injection button are provided at one end of the metering regulator away from the piston rod; a cartridge plunger is provided at one end of the medicine cartridge near the piston rod, and a rubber seal is provided at one end of the medicine cartridge away from the piston rod. The rubber seal is movably installed inside the boss.

[0013] When the combination formed by the snap - in injection mechanism and the elastic needle protection assembly is meshed and installed on the cartridge holder mechanism, align the injection seat with the boss and press. Under the extrusion of the rubber seal, the protection spring is compressed, and the first protective sleeve moves upward. The lower end of the injection needle is preferentially inserted into the rubber seal. The part of the injection seat protruding from the threaded ring first contacts the boss, and the inner ring of the injection seat is snap - connected to the boss. Then the threaded ring meshes with the connecting sleeve, and the support disk is rotated to install the threaded ring and the connecting sleeve, so that the injection needle is completely inserted into the medicine cartridge. During this process, due to the extrusion and frictional force of the rubber seal on the injection needle and the frictional force between the injection seat and the boss, the insertion ring and the support disk rotate relative to each other. The rotating support disk only has a downward pressure on the conical table and no torsional force, avoiding the thinner injection needle from being deformed by rotation and affecting the injection effect.

[0014] The beneficial effects achieved by the present invention with the above - mentioned structure are as follows: 1. An anti - stab device for insulin pen injection provided by the present invention adopts the pre - action principle combined with the elastic structure, and sets an elastic needle protection device. During the whole process of insulin injection and disassembly and replacement of the snap - in injection mechanism, the injection needle is under protective coating, avoiding its exposure outside to cause the risk of needle stick injury or environmental pollution. And after injection, the outer surface of the injection needle is cleaned by the soft cotton sleeve. Dropping disinfectant into the needle - passing hole in advance to wet the soft cotton sleeve can also achieve the effect of disinfecting the injection needle. 2. It adopts a prefabricated structure, and the operation of replacing the snap-on injection mechanism is convenient. Medical staff can complete the replacement without directly contacting the snap-on injection mechanism, which has high safety. When installing, there is only a pressing force on the injection needle, and there is no torsional force, avoiding the deformation of the relatively thin injection needle due to rotation and affecting the injection effect. 3. The pen core holder mechanism and the snap-on injection mechanism are improved on the existing insulin pen structure, with low cost and convenient operation while protecting the safety of medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of an anti-stabbing device for insulin pen injection provided by the present invention; Figure 2 It is an exploded structural diagram of an anti-stabbing device for insulin pen injection provided by the present invention; Figure 3 It is a schematic structural diagram of the pen core holder mechanism; Figure 4 It is a front view of the combined structure of the snap-on injection mechanism and the spring-loaded needle protection component; Figure 5 For Figure 4 The sectional structural diagram at A-A in Figure 6 It is a schematic bottom structure diagram of the snap-on injection mechanism; Figure 7 It is a schematic structural diagram of the snap-on injection mechanism; Figure 8 It is a schematic structural diagram of the second protective sleeve; Figure 9 It is a schematic structural diagram of the spring-loaded needle protection component; Figure 10 It is a schematic bottom structure diagram of the spring-loaded needle protection component.

[0016] Among them, 1. metering regulator, 11. adjusting knob, 12. injection button, 13. piston rod, 2. cartridge holder mechanism, 21. clamping ring, 22. side plate, 23. remaining amount scale, 24. boss, 25. connecting sleeve, 3. spring-actuated needle protection assembly, 31. spring-actuated housing mechanism, 311. support plate, 312. threaded ring, 313. telescopic connecting ring, 314. pressing ring, 315. spring, 316. needle-passing hole, 317. pressing slope, 32. grasping connection mechanism, 321. plugging ring, 322. plugging projection, 323. magnetic bead, 33. control mechanism, 331. sliding ring, 332. magnetic ring, 333. moving plate, 334. support plate, 4. clamping injection mechanism, 41. injection seat, 42. abutting seat, 43. tapered table, 44. clamping block, 45. clamping groove, 46. needle mechanism, 461. injection needle, 462. first protective sleeve, 463. protective spring, 464. second protective sleeve, 465. soft cotton sleeve, 466. vertical dividing groove, 467. circumferential dividing groove, 5. medicine cartridge. Detailed implementation mode

[0017] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. The parts of the technical features or connection relationships of the present invention that are not described in detail are all prior arts adopted.

[0018] The following further describes the present invention in detail with reference to the accompanying drawings.

[0019] As Figures 1 - 10 shown, an anti-stabbing device for insulin pen injection provided by the present invention includes a metering regulator 1. A piston rod 13 is arranged inside the metering regulator 1. An adjusting knob 11 and an injection button 12 are arranged at one end of the metering regulator 1 away from the piston rod 13; a cartridge holder mechanism 2 is installed at one end of the metering regulator 1 close to the piston rod 13. A medicine cartridge 5 is installed inside the cartridge holder mechanism 2. A cartridge plunger is arranged at one end of the medicine cartridge 5 close to the piston rod 13, and a rubber seal is arranged at one end of the medicine cartridge 5 away from the piston rod 13; a clamping injection mechanism 4 is clamped at one end of the cartridge holder mechanism 2 away from the piston rod 13, and a spring-actuated needle protection assembly 3 is engaged at one end of the cartridge holder mechanism 2 away from the piston rod 13. The spring-actuated needle protection assembly 3 is sleeved outside the clamping injection mechanism 4.

[0020] The cartridge holder mechanism 2 includes a clamping ring 21. The clamping ring 21 is movably installed on the metering regulator 1. Side plates 22 are symmetrically arranged at one end of the clamping ring 21 away from the metering regulator 1. Remaining amount scales 23 are linearly arranged in an array on one side of the side plates 22. A boss 24 is connected to one end of the side plates 22 away from the clamping ring 21. The boss 24 is annular. The rubber seal is movably installed inside the boss 24. A connecting sleeve 25 is arranged outside the boss 24. Threads are arranged inside the connecting sleeve 25.

[0021] The elastic needle protection assembly 3 includes an elastic housing mechanism 31, the elastic housing mechanism 31 is meshed and arranged on the connecting sleeve 25, a grasping connection mechanism 32 is rotatably arranged at one end of the elastic housing mechanism 31 close to the connecting sleeve 25, and a control mechanism 33 is slidably arranged in the elastic housing mechanism 31. The control mechanism 33 is arranged outside the grasping connection mechanism 32; Among them, the elastic housing mechanism 31 includes a support disk 311, the support disk 311 is movably arranged at one end of the connecting sleeve 25 away from the piston rod 13, a threaded ring 312 is coaxially arranged on one side of the support disk 311 close to the connecting sleeve 25, the threaded ring 312 is meshed with the connecting sleeve 25, a telescopic connecting ring 313 is coaxially embedded on one side of the support disk 311 away from the threaded ring 312, the telescopic connecting ring 313 adopts a three-stage telescopic structure, the telescopic end of the telescopic connecting ring 313 is coaxially connected with a pressing ring 314, the threaded ring 312 is arranged outside the pressing ring 314, a resilient spring 315 is connected between the pressing ring 314 and the support disk 311, the resilient spring 315 is sleeved outside the telescopic connecting ring 313, the inner side of the pressing ring 314 is connected with a pressing slope 317, the pressing slope 317 is tapered inwards towards the inner side of the pressing ring 314, and a needle-passing hole 316 is provided through the lower end of the pressing slope 317.

[0022] The grasping connection mechanism 32 includes a plugging ring 321, the plugging ring 321 is rotatably arranged coaxially on one side of the support disk 311 close to the connecting sleeve 25, the plugging ring 321 is arranged inside the threaded ring 312, plugging protrusions 322 are circumferentially and evenly arranged on one side of the plugging ring 321 away from the support disk 311, the plugging protrusions 322 are arranged below the threaded ring 312, the inside of the plugging protrusions 322 is hollow, the lower part of the plugging protrusions 322 is arc-shaped, magnetic beads 323 are embedded and movably arranged on the inner side wall of the plugging protrusions 322, a spring is arranged in the plugging protrusions 322, the spring is connected between the magnetic beads 323 and the inner wall of the plugging protrusions 322, and the spring is coated with an insulating coating.

[0023] The control mechanism 33 includes a sliding ring 331, the sliding ring 331 is movably arranged between the plugging ring 321 and the threaded ring 312, a magnetic ring 332 is embedded on the inner wall of the sliding ring 331 facing the plugging ring 321, moving plates 333 are symmetrically arranged on the upper part of the sliding ring 331, the moving plates 333 penetrate and slide on the support disk 311, the moving plates 333 are arranged outside the pressing ring 314, a support plate 334 is rotatably arranged on the outer side wall of the moving plates 333 away from the pressing ring 314, the support plate 334 is arranged in a cuboid shape. When the support plate 334 rotates to the vertical state, the magnetic ring 332 slides to the outside of the plugging ring 321. When the support plate 334 rotates to the horizontal state, the magnetic ring 332 slides to the outside of the plugging protrusions 322.

[0024] The snap - in injection mechanism 4 includes an injection seat 41. The outer diameter of the boss 24 is equal to the inner diameter of the injection seat 41. The injection seat 41 is snap - fitted on the boss 24. The outer diameter of the injection seat 41 is equal to the outer diameter of the insertion ring 321. The upper part of the injection seat 41 is circumferentially arrayed with snap - in blocks 44. The upper end of the snap - in block 44 is in a tapered shape. An abutting seat 42 is arranged inside the injection seat 41. The outer side wall of the abutting seat 42 is circumferentially arrayed with snap - in grooves 45. The snap - in grooves 45 and the snap - in blocks 44 are arranged staggeredly. The circumferentially arrayed snap - in blocks 44 and the circumferentially arrayed insertion lugs 322 are movably and staggeredly snap - fitted. The magnetic beads 323 are movably snap - fitted with the snap - in grooves 45. A tapered table 43 is arranged inside the abutting seat 42. When the magnetic beads 323 are snap - fitted with the snap - in grooves 45, the inner side of the support disc 311 contacts the sloped side wall of the tapered table 43.

[0025] A needle mechanism 46 is coaxially arranged on the tapered table 43. The needle mechanism 46 includes an injection needle 461. The injection needle 461 is arranged through the center of the tapered table 43. The lower end of the injection needle 461 is in the same plane as the bottom wall of the injection seat 41. A first protective sleeve 462 is movably sleeved on the lower end of the injection needle 461. The first protective sleeve 462 is arranged inside the tapered table 43. A protective spring 463 is connected between the first protective sleeve 462 and the tapered table 43. The protective spring 463 is sleeved on the outside of the injection needle 461. A second protective sleeve 464 is sleeved on the upper end of the injection needle 461. The second protective sleeve 464 is arranged above the tapered table 43. The diameter of the needle - passing hole 316 is smaller than the inner diameter of the second protective sleeve 464. The lower end of the pressing slope 317 contacts the upper end of the second protective sleeve 464. A soft cotton sleeve 465 is arranged inside the second protective sleeve 464. The soft cotton sleeve 465 is sleeved on the outside of the injection needle 461. Circumferentially symmetrically penetrating around - dividing grooves 467 are arranged on the outer side wall of the second protective sleeve 464 along the circumferential direction. Vertically arrayed vertical - dividing grooves 466 are arranged above the around - dividing grooves 467. The vertical - dividing grooves 466 penetrate the second protective sleeve 464. The height of the second protective sleeve 464 is higher than the upper end of the injection needle 461. The second protective sleeve 464 is made of PE plastic material.

[0026] Working principle and working process: When in specific use, if a medicine cartridge 5 is already installed in the cartridge holder mechanism 2, observe the state and color of the insulin medicine in the medicine cartridge 5 through the gap between the side plates 22 to ensure that the insulin has not expired or become ineffective. At the same time, observe the remaining amount of the insulin medicine in the medicine cartridge 5 through the remaining - amount scale 23 to ensure the dosage for a single injection. If there is no medicine cartridge 5 in the cartridge holder mechanism 2, turn the cartridge holder mechanism 2 to separate it from the metering regulator 1. Then, load a medicine cartridge 5 into the cartridge holder mechanism 2. The rubber seal is inserted into the inside of the boss 24 and protrudes from the boss 24. The piston rod 13 is in contact with the cartridge plunger. Subsequently, rotate and unscrew the spring-loaded needle protection assembly 3, take out a snap-in injection mechanism 4 and place it in the medical care tray with the conical platform 43 facing upwards. In the initial state, the first protective sleeve 462 protects the end of the injection needle 461 inside the injection seat 41, and the second protective sleeve 464 protects the end of the injection needle 461 above the conical platform 43. Subsequently, hold the support plate 311 by hand and press the grasping connection mechanism 32 downwards onto the snap-in injection mechanism 4. The insertion bump 322 with an arc-shaped lower part is inserted between the snap blocks 44. The insertion ring 321 rotates adaptively relative to the support plate 311. The circumferentially arrayed snap blocks 44 and the circumferentially arrayed insertion bumps 322 are staggeredly engaged. The magnetic beads 323 slide into the insertion bumps 322 under the extrusion of the side wall edge of the abutment seat 42. When the magnetic beads 323 slide to the snap groove 45, they pop out under the elastic action of the spring and are engaged and positioned with the snap groove 45. At this time, the inner side of the support plate 311 contacts the inclined side wall of the conical platform 43, and the lower end of the pressing slope 317 contacts the upper end of the second protective sleeve 464. The entire injection needle 461 is in a covered state, and the snap-in injection mechanism 4 and the spring-loaded needle protection assembly 3 can be installed by vertical pressing.

[0027] Next, hold the support plate 311 by hand and meshingly install the combination formed by the snap-in injection mechanism 4 and the spring-loaded needle protection assembly 3 onto the pen core holder mechanism 2. Align the injection seat 41 with the boss 24 and press. Under the extrusion of the rubber seal strip protruding from the boss 24, the protection spring 463 compresses, and the first protective sleeve 462 moves upwards. The lower end of the injection needle 461 is preferentially inserted into the rubber seal strip. The part of the injection seat 41 protruding from the threaded ring 312 contacts the boss 24 first. The inner ring of the injection seat 41 is snap-connected to the boss 24. Subsequently, the threaded ring 312 meshes with the connecting sleeve 25. Rotate the support plate 311 to install the threaded ring 312 and the connecting sleeve 25, so that the injection needle 461 is completely inserted into the medicament pen core 5. During this process, due to the extrusion and frictional force of the rubber seal strip on the injection needle 461 and the frictional force between the injection seat 41 and the boss 24, the insertion ring 321 rotates relative to the support plate 311. The rotating support plate 311 only exerts a downward pressure on the conical platform 43 and no torsional force, avoiding the deformation of the relatively thin injection needle 461 due to rotation and affecting the injection effect.

[0028] After installing the elastic needle protection assembly 3, exhaust the medicament cartridge 5 by rotating the adjustment screw 11 multiple times and pressing the injection button 12. Observe whether the soft cotton sleeve 465 at the upper end of the injection needle 461 is wet through the needle-passing hole 316 to determine whether the exhaust operation is completed. After completing the exhaust operation, check whether the adjustment screw 11 returns to zero. Then, adjust the required injection dose by the adjustment screw 11. Align the pressing ring 314 with the injection part, hold the metering regulator 1 and press the insulin pen. The elastic spring 315 compresses, the pressing ring 314 approaches the support plate 311, and the lower end of the pressing slope 317 squeezes the upper end of the second protective sleeve 464. The second protective sleeve 464 made of PE plastic tears along the vertical split groove 466 under the extrusion and opens obliquely along the inner wall of the pressing slope 317 until the second protective sleeve 464 tears to surround the split groove 467 and opens outward. The soft cotton sleeve 465 compresses downward along the injection needle 461, and the injection needle 461 extends out of the needle-passing hole 316. After the injection needle 461 pierces the patient's skin, press the injection button 12 to inject insulin, and then pull it out after staying for ten seconds. When pulling out, under the elastic action of the elastic spring 315, the pressing ring 314 bounces up, the telescopic connecting ring 313 stretches and covers the injection needle 461 again, and the lower end of the pressing slope 317 no longer presses the soft cotton sleeve 465. The soft cotton sleeve 465 slowly recovers to cover the injection needle 461 and cleans the residual blood or liquid medicine on the injection needle 461 during this process.

[0029] After the injection is completed, rotate and unscrew the elastic needle protection assembly 3. Under the extrusion and fixation of the magnetic bead 323, the snap-in injection mechanism 4 gradually disengages from the boss 24 following the elastic needle protection assembly 3, and finally slowly pulls out the injection needle 461 from the rubber seal. During this process, the first protective sleeve 462 slides to the lower end of the injection needle 461 under the elastic action of the protection spring 463 to protect the end of the injection needle 461. Finally, the medical staff takes the elastic needle protection assembly 3 with the snap-in injection mechanism 4 above the sharps container, rotates the support plate 334 to make the support plate 334 in a horizontal state and presses the moving plate 333. The sliding ring 331 moves downward, making the magnetic ring 332 move to the outside of the magnetic bead 323. The magnetic bead 323 contracts into the plug-in protrusion 322 under the magnetic attraction of the magnetic ring 332 and no longer restricts the snap-in injection mechanism 4. Under the action of gravity, the entire snap-in injection mechanism 4 falls into the sharps container.

[0030] During the whole process of insulin pen injection and disassembly and replacement of the snap - on injection mechanism 4, the injection needle 461 is always under protective cover, avoiding being exposed outside to cause the risk of needle stick injury or being polluted by the environment. And after injection, the outer surface of the injection needle 461 is cleaned by the soft cotton sleeve 465. Dropping disinfectant into the needle - passing hole 316 in advance to moisten the soft cotton sleeve 465 can also achieve the effect of disinfecting the injection needle 461. Adopting an assembled structure, the operation of replacing the snap - on injection mechanism 4 is convenient. Medical staff can complete the replacement without directly contacting the snap - on injection mechanism 4, with high safety. And it is improved on the existing insulin pen structure, with low cost.

[0031] It should be noted that the structures of the metering regulator 1 and the medicine cartridge 5 adopt the structures of insulin pens in the prior art, and their operation steps and principles are all prior art, which will not be elaborated here.

[0032] The above is the overall working process of the present invention. Just repeat these steps when using it next time.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0034] The above has described the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention creation, design structurally similar ways and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An anti-stab device for insulin pen injection, comprising a metering regulator (1), wherein a piston rod (13) is provided inside the metering regulator (1), characterized in that: The invention also comprises a cartridge holder mechanism (2), a snap-on injection mechanism (4) and an elastic needle protection assembly (3), wherein the cartridge holder mechanism (2) is mounted on one end of the metering regulator (1) close to the piston rod (13), a medicine cartridge (5) is mounted inside the cartridge holder mechanism (2), the snap-on injection mechanism (4) is snap-fitted on one end of the cartridge holder mechanism (2) away from the piston rod (13), the elastic needle protection assembly (3) is meshedly mounted on one end of the cartridge holder mechanism (2) away from the piston rod (13), and the elastic needle protection assembly (3) is The elastic needle protection assembly (3) is sleeved on the outer side of the snap-on injection mechanism (4), wherein the elastic cover mechanism (31), a grabbing connection mechanism (32) and a control mechanism (33), wherein the elastic cover mechanism (31) is meshedly arranged on the refill frame mechanism (2), the grabbing connection mechanism (32) is rotatably arranged on one end of the elastic cover mechanism (31) close to the refill frame mechanism (2), the control mechanism (33) is slidably arranged in the elastic cover mechanism (31), and the control mechanism (33) is arranged on the outer side of the grabbing connection mechanism (32).

2. The anti-stab wound device for insulin pen injection according to claim 1, characterized in that: The elastic cover mechanism (31) comprises a support plate (311), a threaded ring (312), a telescopic connecting ring (313), a pressing ring (314) and an elastic spring (315); the support plate (311) is movably arranged at one end of the refill frame mechanism (2) away from the piston rod (13); the threaded ring (312) is coaxially arranged at a side of the support plate (311) close to the refill frame mechanism (2); the telescopic connecting ring (313) is coaxially embedded in the support plate (311); The support plate (311) is located at a side away from the threaded ring (312); the telescopic connecting ring (313) adopts a three-stage telescopic structure; the pressing ring (314) is coaxially connected to the telescopic end of the telescopic connecting ring (313); the threaded ring (312) is arranged on the outside of the pressing ring (314); the elastic spring (315) is connected between the pressing ring (314) and the support plate (311); and the elastic spring (315) is sleeved on the outside of the telescopic connecting ring (313).

3. The anti-stab wound device for insulin pen injection according to claim 2, characterized in that: The inner side of the pressing ring (314) is connected to a pressing slope (317), the pressing slope (317) closes towards the inner side of the pressing ring (314) in an inverted cone shape, and a pinhole (316) is provided through the lower end of the pressing slope (317).

4. The anti-stab wound device for insulin pen injection according to claim 3, characterized in that: The grabbing connection mechanism (32) comprises a plug-in ring (321), a plug-in protrusion (322) and a magnetic bead (323); the plug-in ring (321) is coaxially rotatably arranged on a side of the support disk (311) close to the refill holder mechanism (2); the plug-in ring (321) is arranged on the inner side of the threaded ring (312); the plug-in protrusions (322) are evenly distributed circumferentially on a side of the plug-in ring (321) away from the support disk (311); the interior of the plug-in protrusion (322) is hollow; the lower part of the plug-in protrusion (322) is arc-shaped; the magnetic bead (323) is embedded and movably arranged on the inner side wall of the plug-in protrusion (322); a spring is arranged in the plug-in protrusion (322); and the spring is connected between the magnetic bead (323) and the inner wall of the plug-in protrusion (322).

5. The anti-stab wound device for insulin pen injection according to claim 4, characterized in that: The control mechanism (33) comprises a sliding ring (331), a magnetic ring (332) and a moving plate (333); the sliding ring (331) is movably arranged between the plug-in ring (321) and the threaded ring (312); the magnetic ring (332) is embedded in the inner wall of the sliding ring (331) facing the plug-in ring (321); the moving plate (333) is symmetrically arranged on the upper part of the sliding ring (331); and the moving plate (333) penetrates and is slidably arranged on the support plate (311). ), the movable plate (333) is arranged on the outer side of the pressing ring (314), and a support plate (334) is rotatably arranged on the outer side wall of the movable plate (333) away from the pressing ring (314), and the support plate (334) is arranged in a rectangular parallelepiped. When the support plate (334) rotates to a vertical state, the magnetic ring (332) slides to the outer side of the plug-in ring (321), and when the support plate (334) rotates to a horizontal state, the magnetic ring (332) slides to the outer side of the plug-in protrusion (322).

6. The anti-stab wound device for insulin pen injection according to claim 5, characterized in that: The snap-fit ​​injection mechanism (4) comprises an injection seat (41), a stop seat (42), a conical platform (43) and a needle mechanism (46); the injection seat (41) is snap-fitted to an end of the refill holder mechanism (2) away from the piston rod (13); the outer diameter of the injection seat (41) is equal to the outer diameter of the plug ring (321); a snap-fit ​​block (44) is arranged in a circular array on the upper part of the injection seat (41); the upper end of the snap-fit ​​block (44) is in a pointed cone shape; the stop seat (42) is arranged on the inner side of the injection seat (41); the outer side of the stop seat (42) is provided with a plurality of snap-fit ​​blocks (44); The wall is provided with a circumferential array of engaging grooves (45), the engaging grooves (45) and the engaging blocks (44) are arranged in an interlaced manner, the engaging blocks (44) of the circumferential array are engaged in an interlaced manner with the plugging protrusions (322) of the circumferential array, the magnetic beads (323) are engaged in an interlaced manner with the engaging grooves (45), the conical platform (43) is arranged on the inner side of the stop seat (42), when the magnetic beads (323) are engaged with the engaging grooves (45), the inner side of the support plate (311) contacts the sloped side wall of the conical platform (43), and the needle mechanism (46) is coaxially arranged on the conical platform (43).

7. The anti-stab wound device for insulin pen injection according to claim 6, characterized in that: The needle mechanism (46) comprises an injection needle (461), a first protective sleeve (462) and a second protective sleeve (464); the injection needle (461) is arranged through the center of the conical platform (43); the lower end of the injection needle (461) and the bottom wall of the injection seat (41) are in the same plane; the first protective sleeve (462) is movably sleeved on the lower end of the injection needle (461); the first protective sleeve (462) is arranged on the inner side of the conical platform (43); the first protective sleeve (464 ... A protective spring (463) is connected between the injection needle (461) and the conical platform (43), the protective spring (463) is sleeved on the outside of the injection needle (461), the second protective sleeve (464) is sleeved on the upper end of the injection needle (461), the second protective sleeve (464) is arranged above the conical platform (43), the diameter of the needle hole (316) is smaller than the inner diameter of the second protective sleeve (464), and the lower end of the pressing slope (317) is in contact with the upper end of the second protective sleeve (464).

8. The anti-stab wound device for insulin pen injection according to claim 7, characterized in that: A soft cotton sleeve (465) is provided on the inner side of the second protective sleeve (464), and the soft cotton sleeve (465) is sleeved on the outer side of the injection needle (461). Surrounding dividing grooves (467) are symmetrically penetrated along the circumferential direction on the outer side wall of the second protective sleeve (464), and vertical dividing grooves (466) are provided in the upper vertical array of the surrounding dividing grooves (467), and the vertical dividing grooves (466) penetrate the second protective sleeve (464).

9. The anti-stab wound device for insulin pen injection according to claim 8, characterized in that: The refill holder mechanism (2) comprises a clamping ring (21), a side plate (22), a boss (24) and a connecting sleeve (25); the clamping ring (21) is movably mounted on the metering regulator (1); the side plate (22) is symmetrically arranged at one end of the clamping ring (21) away from the metering regulator (1); a linear array of residual gauge rods (23) is arranged on one side of the side plate (22); the boss (24) is connected to one end of the side plate (22) away from the clamping ring (21); the boss (24) is annular; the outer diameter of the boss (24) is equal to the inner diameter of the injection seat (41); the connecting sleeve (25) is arranged on the outer side of the boss (24); a thread is arranged on the inner side of the connecting sleeve (25); and the connecting sleeve (25) is meshed with the threaded ring (312).

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