Device providing a hidden needle and post-injection needle stick protection and pre-filled syringe

Abstract

The utility model relates to pre -filled medicine bottle technical field, concretely relates to provide the device and pre -filled syringe of hidden needle and injection needle head prevent stab protection, and the device includes hidden needle cover, medicine storehouse shell, locking sleeve, medicine bottle support, locking sleeve top rod, and the inside of medicine storehouse shell sets up hidden needle cover, the top of hidden needle cover sets up locking sleeve, and the inside of locking sleeve sets up medicine bottle support, and the inside for setting up pre -filled medicine bottle of medicine bottle support, the bottom of locking sleeve and the top of hidden needle cover mutually inlay, and, the top of medicine bottle support sets up locking sleeve top rod, when not injecting, locking sleeve and hidden needle cover can freely move, after completing injection, locking sleeve top rod can lock locking sleeve, makes hidden needle in pre -filled medicine bottle inside unable to expose. The utility model can realize the needle head of not injecting, and does not influence the removal of hidden needle protection cap, provides the friendly experience to the needle user, after injection, locks hidden needle cover, avoids the exposure of hidden needle, prevents the needle head from injuring the relevant personnel, improves the use safety.

Description

Technical Field

[0001] This utility model relates to the field of pre-filled medicine bottle technology, specifically to a device that provides protection against needle puncture after injection and a pre-filled syringe. Background Technology

[0002] Disposable pre-filled syringe vials are currently the most commonly used packaging material for medical syringes. They are generally used in mechanical injection pens, but are not commonly used in electronic injection pens. When pre-filled vials are used in conjunction with electronic injection pens as consumables, in order to prevent the needle from accidentally injuring the user after use and causing unnecessary harm, or to prevent the drug container of the pre-filled vial from being reused, it is now generally required that the needle be uniformly recycled and destroyed after the injection is completed.

[0003] However, the unified collection method has a time lag issue; it doesn't involve immediate disposal after use. Therefore, exposed needles pose a risk of injuring individuals. Furthermore, a significant proportion of patients experience needle phobia when using syringes for self-injection.

[0004] Therefore, there is an urgent need to provide a device and a pre-filled syringe that provide protection against needle punctures after injection and for concealed needles. Utility Model Content

[0005] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a device for providing hidden needle and needle anti-puncture protection after injection, and a pre-filled syringe.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] In a first aspect, the present invention provides a device for providing protection against needle puncture after injection and for preventing needle tip puncture, comprising a needle sheath, a drug cartridge shell, a locking sleeve, a drug bottle holder, and a locking sleeve top rod. The needle sheath is disposed inside the drug cartridge shell, and the lower part of the needle sheath extends out of the drug cartridge shell. The locking sleeve is disposed above the needle sheath, and the drug bottle holder is disposed inside the locking sleeve. The drug bottle holder is used to hold a pre-filled drug bottle. The bottom of the locking sleeve and the top of the needle sheath fit together, and the locking sleeve top rod is disposed above the drug bottle holder.

[0008] Furthermore, when not injected, the locking sleeve and the hidden needle sleeve can move freely, allowing the hidden needle inside the pre-filled vial to be exposed or hidden.

[0009] After the injection is completed, the locking sleeve top rod can lock the locking sleeve, so that the hidden needle inside the pre-filled vial cannot be exposed.

[0010] Furthermore, the lower surface of the locking sleeve is provided with circumferentially distributed helical teeth, and the upper surface of the concealed needle sleeve is provided with a sliding limiting surface that cooperates with the helical teeth. The sliding limiting surface has a high point and a low point, and the connecting surface between the high point and the low point is an inclined surface. A reset element is also sleeved on the outside of the locking sleeve. Under the action of the reset element, the helical teeth can rotate with the axial movement of the concealed needle sleeve, and the position of the tooth tip of the helical teeth switches between the high point and the low point.

[0011] Furthermore, an active sliding oblique pin is provided inside the outer shell of the medicine container, and a sliding groove is provided on the side wall of the sliding limiting surface above the hidden needle sleeve, and the active sliding oblique pin can be embedded in the sliding groove.

[0012] Furthermore, the reset element is a spring.

[0013] Furthermore, the locking sleeve includes a lower first ring and an upper second ring, the outer diameter of the first ring being larger than the outer diameter of the second ring, and the helical teeth being provided on the lower surface of the first ring;

[0014] The lower surface of the spring abuts against the upper surface of the first ring, and the upper surface of the spring abuts against the medicine bottle holder.

[0015] Furthermore, the second ring is provided with several locking bars. In the initial state, one of the locking bars corresponds vertically to the locking sleeve top rod; and the width of the locking sleeve top rod is less than the distance between adjacent locking bars.

[0016] After the injection is completed; the distance between the lower surface of the locking sleeve top rod and the upper surface of one of the locking bars is set as d1, the distance between the hidden needle inside the pre-filled medicine bottle and the lower surface of the hidden needle sleeve is set as d2, and the tip height of the helical tooth is set as d3. Then d1 < d2, d1 < d3.

[0017] Furthermore, the helical teeth of the locking sleeve correspond to the position of the locking bar.

[0018] Furthermore, two guide strips are provided on the inner wall of the drug compartment shell, and a sliding groove for the hidden needle sleeve is located between the two guide strips; an automatic injection push rod is provided on one side of the hidden needle sleeve, and the automatic injection push rod is embedded in the sliding groove of the hidden needle sleeve.

[0019] Furthermore, the inner wall of the medicine container shell is also provided with a hidden needle sleeve limiting strip, and a step is provided above the hidden needle sleeve. The upper surface of the hidden needle sleeve limiting strip is used to limit the step.

[0020] Furthermore, an observation window is provided on the outer shell of the medicine container, and an observation window is also provided on the hidden needle sleeve.

[0021] Furthermore, the device for providing protection against needle puncture after injection and for preventing needle tip puncture also includes a medicine chamber cap, which is provided on the upper surface of the medicine bottle support; a buckle is provided on the inner wall above the medicine chamber shell, and the buckle presses against the upper edge of the medicine chamber cap.

[0022] Furthermore, the number of locking sleeve top rods is 2, and the two locking sleeve top rods are respectively arranged on both sides above the medicine bottle support.

[0023] Furthermore, the medicine bottle holder includes an upper end plate and a sleeve connecting the end plate, the sleeve being used to hold a pre-filled medicine bottle; a receiving groove is provided on the upper side wall of the sleeve, and the locking sleeve top rod is provided in the receiving groove.

[0024] Furthermore, a push rod inclined pin insertion hole is provided above the end plate, and the push rod inclined pin insertion hole corresponds to the position of the locking sleeve top rod in the axial direction.

[0025] Furthermore, the upper surface of the locking sleeve top rod is provided with a downward groove, the inner wall of the outer side of the groove is a slope, and the main unit that cooperates with the device that provides protection against needle puncture after injection has a push rod angled pin, which is inserted into the groove after passing through the push rod angled pin insertion hole.

[0026] Furthermore, a limiting plate extends downward from the lower surface of the end plate, and an opening is provided on the limiting plate to avoid the locking sleeve top rod. A limiting rib is provided on the side wall of the opening. Limiting grooves are provided on both sides of the locking sleeve top rod, and the limiting ribs are inserted into the limiting grooves.

[0027] Furthermore, each side of the locking sleeve top rod is provided with two limiting grooves, and the two limiting grooves are horizontally arranged.

[0028] Furthermore, the inner wall of the medicine compartment shell is provided with a limiting rib, and the outer edge of the medicine bottle support is provided with a limiting groove, and the limiting rib is inserted into the limiting groove.

[0029] Furthermore, an annular groove is provided on the lower outer wall of the locking sleeve, and a buckle is provided on the upper part of the concealed needle sleeve, the buckle being engaged in the annular groove; a spiral groove is provided on the outer wall of the medicine bottle holder, and a thread is provided on the inner wall of the locking sleeve, the thread being engaged in the spiral groove;

[0030] A reset element is also fitted outside the locking sleeve. Under the action of the reset element, the locking sleeve can move axially with the axial movement of the hidden needle sleeve. The locking sleeve also has rotational movement while moving axially.

[0031] Furthermore, the reset element is a spring, and a spring limiting sleeve is also provided outside the locking sleeve. The upper surface of the spring limiting sleeve abuts against the upper edge of the medicine bottle holder, the lower surface of the spring limiting sleeve abuts against the upper part of the spring, and the lower part of the spring abuts against the hidden needle sleeve.

[0032] Furthermore, a guide strip is provided on the inner wall of the outer shell of the medicine container, and a guide groove is provided on the hidden needle sleeve, with the guide strip embedded in the guide groove.

[0033] Furthermore, the device for providing protection against needle puncture after injection and the hidden needle also includes a medicine chamber cap, which is provided on the upper surface of the medicine bottle support; a buckle is provided on the inner wall above the medicine chamber shell, and the buckle presses against the upper edge of the medicine chamber cap;

[0034] The locking sleeve top rod includes a connecting ring and two top blocks, which are respectively disposed on both sides above the medicine bottle holder.

[0035] Furthermore, the medicine bottle holder includes an upper end plate and a sleeve connecting the end plate, the sleeve being used to hold a pre-filled medicine bottle; a receiving groove is provided on the upper side wall of the sleeve, and the top block is provided in the receiving groove; each receiving groove is provided with two snap-fit ​​grooves spaced vertically apart, and a limiting buckle is provided on the inner side of the top block, the limiting buckle being able to snap into the snap-fit ​​groove.

[0036] Furthermore, a push rod inclined pin insertion hole is provided above the end plate, and the push rod inclined pin insertion hole corresponds to the position of the top block in the axial direction.

[0037] Furthermore, two helical inclined surfaces are provided above the locking sleeve. In the initial state, the top block corresponds to the top surface of one of the helical inclined surfaces; after injection, the top block is embedded between the two helical inclined surfaces.

[0038] Secondly, the present invention also provides a pre-filled syringe, including the above-mentioned device for providing a concealed needle and needle puncture protection after injection.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] This invention provides a device for protecting the concealed needle and the needle tip from puncture after injection. A locking sleeve is installed above the concealed needle sleeve, with its bottom and top interlocking. When not injecting, the locking sleeve and the concealed needle sleeve can move freely, allowing the concealed needle inside the pre-filled vial to be exposed or hidden. After injection, the locking sleeve's top rod locks the sleeve, preventing the concealed needle from being exposed. Furthermore, this device, whether connected to a main unit or not, can conceal the needle when not injecting without affecting the removal of the concealed needle cap, providing a user-friendly experience for those with needle phobia. After injection, locking the concealed needle sleeve prevents exposure, protecting personnel from needle punctures and improving safety. Additionally, it prevents reuse of the medication container, and the concealed needle after injection avoids secondary contamination, improving the biosafety of the medication container. Attached Figure Description

[0041] Figure 1 This is an isometric view of Embodiment 1 of this utility model;

[0042] Figure 2 This is an exploded axial view of Embodiment 1 of this utility model;

[0043] Figure 3 This is an isometric view of the locking sleeve according to Embodiment 1 of this utility model;

[0044] Figure 4 This is an isometric view of the hidden needle sleeve according to Embodiment 1 of this utility model;

[0045] Figure 5 This is a structural diagram of the internal structure of the medicine container shell according to Embodiment 1 of this utility model;

[0046] Figure 6 This is an isometric view of the medicine bottle holder according to Embodiment 1 of this utility model;

[0047] Figure 7 This is an isometric view of the medicine bottle cap according to Embodiment 1 of this utility model;

[0048] Figure 8 This is an isometric view of the locking sleeve top rod of Embodiment 1 of this utility model;

[0049] Figure 9 This is an axonometric view of the initial state of Embodiment 1 of this utility model, in which part of the outer wall of the medicine container shell is hidden;

[0050] Figure 10 This is a side sectional view of the initial state of Embodiment 1 of this utility model;

[0051] Figure 11 This is an isometric view of the second state of Embodiment 1 of the present invention, in which part of the outer wall of the medicine container shell is hidden;

[0052] Figure 12 This is an isometric view of the third state of Embodiment 1 of the present invention, in which part of the outer wall of the medicine container shell is hidden;

[0053] Figure 13 This is an isometric view of the fourth state of Embodiment 1 of this utility model, in which the outer shell of the medicine container is hidden;

[0054] Figure 14 This is an axial sectional view of the push rod inclined pin inside the main unit before it contacts the locking sleeve top rod after the first embodiment of this utility model is connected to the main unit;

[0055] Figure 15 This is an axial sectional view of the push rod inclined pin inside the main unit after it is connected to the main unit in Embodiment 1 of this utility model, and after contact between the locking sleeve top rod and the main unit.

[0056] Figure 16 This is a cross-sectional view of the locking sleeve top rod in the first position in Embodiment 1 of this utility model;

[0057] Figure 17 This is a cross-sectional view of the locking sleeve top rod in the first position in Embodiment 1 of this utility model;

[0058] Figure 18 This is an axonometric view of the fifth state of Embodiment 1 of this utility model, in which part of the outer wall of the medicine container shell is hidden;

[0059] Figure 19 This is an axonometric view of the sixth state of Embodiment 1 of this utility model, in which part of the outer wall of the medicine container shell is hidden;

[0060] Figure 20 This is an isometric view of Embodiment 2 of this utility model;

[0061] Figure 21 This is an isometric view of the locking sleeve according to Embodiment 2 of this utility model;

[0062] Figure 22 This is an isometric view of the hidden needle sleeve according to Embodiment 2 of this utility model;

[0063] Figure 23 This is a structural diagram of the internal structure of the medicine container shell in Embodiment 2 of this utility model;

[0064] Figure 24 This is an isometric view of the medicine bottle holder according to Embodiment 2 of this utility model;

[0065] Figure 25 This is an isometric view of the locking sleeve top rod of Embodiment 2 of this utility model;

[0066] Figure 26 This is an isometric view of the initial state of Embodiment 2 of this utility model, in which the outer shell of the medicine compartment and the spring limiting sleeve are hidden;

[0067] Figure 27 This is an isometric view of the second state of Embodiment 2 of the present invention, in which the outer shell of the medicine compartment and the spring limiting sleeve are hidden;

[0068] Figure 28 This is an isometric view of the third state of Embodiment 2 of this utility model, in which the outer shell of the medicine compartment and the spring limiting sleeve are hidden;

[0069] Figure 29 This is an isometric view of the fourth state of Embodiment 2 of this utility model, in which the outer shell of the medicine compartment and the spring limiting sleeve are hidden;

[0070] Figure 30 This is an axial exploded view of Embodiment 2 of this utility model.

[0071] Figure label:

[0072] 1. Hidden needle sleeve; 101. Sliding limiting surface; 102. Slide groove; 103. Automatic injection ejector rod; 104. Buckle; 105. Guide groove;

[0073] 2. Medicine compartment shell, 201. Active sliding inclined pin, 202. Guide bar, 203. Hidden needle sleeve sliding groove, 204. Hidden needle sleeve limiting strip, 205. Observation window, 206. Buckle, 207. Limiting rib;

[0074] 3. Locking sleeve, 301. Helical tooth, 302. Locking bar, 303. Annular groove, 304. Thread, 305. Helical bevel, 3511. Bottom surface, 3512. Top surface;

[0075] 4. Medicine bottle holder; 401. End plate; 402. Sleeve; 403. Receiving groove; 404. Push rod inclined pin insertion hole; 405. Limiting rib; 406. Limiting groove; 407. Spiral groove; 408. Buckle groove.

[0076] 5. Spring,

[0077] 6. Locking sleeve top rod, 601. Groove, 602. Bevel, 603. Limiting groove, 604. Top block, 605. Limiting buckle.

[0078] 7. Medicine compartment cover; 701. Movable groove; 702. Mounting surface; 703. Push rod insertion hole; 704. Push rod inclined pin insertion hole;

[0079] 8. Pre-filled and sealed medicine bottles,

[0080] 9. Push rod, 10. Push rod inclined pin, 11. Spring limit sleeve. Detailed Implementation

[0081] The technical solution of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0082] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of this utility model.

[0083] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0084] Example 1

[0085] This embodiment provides a device for providing protection against needle punctures after injection, such as... Figure 1 and Figure 2 As shown, the device includes a concealed needle sleeve 1, a medicine chamber shell 2, a locking sleeve 3, a medicine bottle support 4, a locking sleeve top rod 6, a medicine chamber cap 7, and a reset element. The medicine chamber shell 2 is a structural component with a through hole inside. The concealed needle sleeve 1 is disposed inside the medicine chamber shell 2, and the concealed needle sleeve 1 extends out of the medicine chamber shell 2 from below. The locking sleeve 3 is disposed above the concealed needle sleeve 1, and the medicine bottle support 4 is disposed inside the locking sleeve 3. The medicine bottle support 4 has a through hole inside, which is used to hold a pre-filled medicine bottle 8. The medicine chamber cap 7 is disposed above the medicine bottle support 4, and the medicine chamber cap 7 is used to press the pre-filled medicine bottle 8.

[0086] The bottom of the locking sleeve 3 and the top of the hidden needle sleeve 1 fit together, and the locking sleeve top rod 6 is provided above the medicine bottle support 4;

[0087] Furthermore, when not injected, the locking sleeve 3 and the hidden needle sleeve 1 can move freely, allowing the hidden needle inside the pre-filled vial 8 to be exposed or hidden.

[0088] After the injection is completed, the locking sleeve top rod 6 can lock the locking sleeve 3, so that the hidden needle inside the pre-filled medicine bottle 8 cannot be exposed.

[0089] The entire device, providing protection for the concealed needle and post-injection needle tip, is a disposable pharmaceutical packaging material. When not being injected, the concealed needle sleeve 1 can move freely, allowing for the removal of the needle protector, abnormal contact, and needle insertion, causing the concealed needle sleeve 1 to retract and expose the needle, while simultaneously completing the injection. After injection, the locking sleeve 3 is locked, preventing the concealed needle sleeve 1 from moving freely and thus preventing the concealed needle inside the pre-filled vial 8 from being exposed. This avoids needle tip injury to the operator and also eliminates the risk of reusing the device.

[0090] like Figure 3 The diagram shows the structure of the locking sleeve 3. The locking sleeve 3 includes a lower first ring and an upper second ring. The outer diameter of the first ring is larger than the outer diameter of the second ring. The lower surface of the first ring is provided with helical teeth 301, and the inclination direction of the helical teeth 301 is all facing the same side. A plurality of locking strips 302 are provided on the upper surface of the second ring. The locking strips 302 extend upward. In this embodiment, a total of six locking strips 302 are provided on the second ring. Each locking strip 302 is the same size, and the six locking strips 302 are evenly distributed circumferentially.

[0091] Furthermore, the helical teeth 301 of the locking sleeve 3 correspond to the position of the locking bar 302, that is, the tips of the helical teeth 301 are almost aligned with the left sidewall of the locking bar 302.

[0092] like Figure 4 The diagram shows the structure of the concealed needle sleeve 1. The upper surface of the concealed needle sleeve 1 has a sliding limiting surface 101 that engages with the helical teeth 301. The sliding limiting surface 101 has a high point and a low point, and the connecting surface between the high point and the low point is an inclined surface. Therefore, the sliding limiting surface 101 is a surface with alternating high and low points, with each low point corresponding to one helical tooth 301. A sliding groove 102 is also provided on the upper side wall of the concealed needle sleeve 1. Additionally, an automatic injection rod 103 is also provided on the upper side wall of the concealed needle sleeve 1. The automatic injection rod 103 engages with the main unit to activate the automatic injection function in the main unit. The main unit is an electronic injection pen that engages with the device providing concealed needle and post-injection needle puncture protection in this embodiment. An observation window is also provided on the side wall of the concealed needle sleeve 1 to facilitate observation of the drug injection inside.

[0093] like Figure 5 The diagram shows the structure of the outer shell 2 of the drug reservoir. The upper half of the outer shell 2 is an annular structure, and the inner diameter of the lower half gradually decreases to match the outer diameter of the concealed needle sleeve 1. Two guide bars 202 are provided on the inner wall of the outer shell 2, and a sliding groove 203 for the concealed needle sleeve is formed between the two guide bars 202. The automatic injection push rod 103 of the concealed needle sleeve 1 is embedded in the sliding groove 203. Therefore, when the concealed needle sleeve 1 moves freely up and down, because the automatic injection push rod 103 is confined within the sliding groove 203, the concealed needle sleeve 1 can only move along the axial direction of the outer shell 2 and cannot rotate.

[0094] An active sliding oblique pin 201 is also provided on the inner wall of the outer shell 2 of the medicine container. The active sliding oblique pin 201 can be embedded in the groove 102 of the hidden needle sleeve 1. When not injected, the upper surface of the active sliding oblique pin 201 abuts against the inclined surface of the oblique tooth 301 of the locking sleeve 3, and the side of the active sliding oblique pin 201 abuts against the approximately vertical surface of the oblique tooth 301 of the locking sleeve 3.

[0095] In this embodiment, three active sliding oblique pins 201 are provided along the circumference, and the three active sliding oblique pins 201 are evenly distributed.

[0096] Multiple concealed needle sleeve limiting strips 204 are also provided on the inner wall of the medicine container shell 2, and the multiple concealed needle sleeve limiting strips 204 are arranged along the circumference of the medicine container shell 2; the outer diameter of the upper part of the concealed needle sleeve 1 is larger than the outer diameter of the lower part, thus forming a step, and the upper surface of the concealed needle sleeve limiting strip 204 is used to limit the step, thereby preventing the concealed needle sleeve 1 from coming off from the bottom of the medicine container shell 2.

[0097] An observation window 205 is also provided on the outer shell 2 of the medicine compartment. The observation window 205 on the outer shell 2 of the medicine compartment corresponds to the position of the observation window on the hidden needle sleeve 1. Therefore, the pre-filled medicine bottle 8 inside can be directly observed through the observation window.

[0098] A buckle 206 is provided on the inner wall above the outer shell 2 of the medicine compartment. The buckle 206 presses against the upper edge of the medicine compartment cover 7, so that the medicine compartment cover 7 is tightly installed on the outer shell 2 of the medicine compartment.

[0099] like Figure 6 The diagram shows the structure of a medicine bottle holder 4. The medicine bottle holder 4 includes an upper end plate 401 and a sleeve 402 connecting the end plate 401. The sleeve 402 is used to hold pre-filled medicine bottles 8. A receiving groove 403 is provided on the upper side wall of the sleeve 402, and the locking sleeve top rod 6 is disposed within the receiving groove 403. There are two locking sleeve top rods 6, respectively located on both sides of the upper part of the medicine bottle holder 4.

[0100] A push rod inclined pin insertion hole 404 is provided above the end plate 401, and the push rod inclined pin insertion hole 404 corresponds to the position of the locking sleeve top rod 6 in the axial direction. The host connected to the device of this embodiment has a push rod 9, and push rod inclined pins 10 are provided on both sides of the push rod 9. During injection, the push rod 9 is inserted into the through hole in the center of the medicine bottle holder 4 to push the liquid medicine in the pre-filled medicine bottle 8, and the push rod inclined pins 10 are inserted into the push rod inclined pin insertion hole 404 to lock the locking sleeve 3.

[0101] One side of the end plate 401 is also provided with a clearance groove to avoid the automatic injection push rod 103 of the concealed needle sleeve; in addition, the edge of the end plate 401 is also provided with a limiting groove, which cooperates with the limiting rib of the inner wall of the drug compartment shell to limit the rotation of the drug bottle holder. The upper surface of the end plate 401 is also provided with two protrusions, and a cover plate is provided above the pre-filled drug bottle 8. The two sides of the cover plate are flat, and the cover plate is embedded between the two protrusions to limit the rotation of the pre-filled drug bottle 8. The drug compartment cap 7 covers the cover plate of the pre-filled drug bottle 8 to fix the pre-filled drug bottle 8.

[0102] A limiting plate extends downward from the lower surface of the end plate 401, and the limiting plate has an opening to avoid the locking sleeve top rod 6.

[0103] like Figure 7 The diagram shows the structure of the medicine compartment cover 7. The medicine compartment cover 7 has a push rod insertion hole 703 in the center for inserting the push rod 9. Push rod inclined pin insertion holes 704 are provided on both sides of the push rod insertion hole 703. The push rod inclined pin insertion holes 704 of the medicine compartment cover 7 correspond to the push rod inclined pin insertion holes 404 of the medicine bottle holder 4, and are both used for inserting the push rod inclined pin 10.

[0104] The drug chamber cap 7 is also provided with a movable groove 701 on one side to avoid the automatic injection rod 103 of the hidden needle sleeve 1. The outer edge of the drug chamber cap 7 has a step, and the step surface is the mounting surface 702. The buckle 206 of the drug chamber shell 2 snaps onto the mounting surface 702, thereby realizing the assembly of the drug chamber cap 7.

[0105] like Figure 8 The diagram shows the structure of the locking sleeve top rod 6. The upper surface of the locking sleeve top rod 6 has a downward groove 601. The inner wall of the outer side of the groove 601 is an inclined surface 602. The push rod inclined pin 10 passes through the push rod inclined pin insertion hole 704 of the medicine compartment cover 7 and the push rod inclined pin insertion hole 404 of the medicine bottle support 4 in sequence before being inserted into the groove 601. The lower surface of the push rod inclined pin 10 presses against the inclined surface 602, causing the locking sleeve top rod 6 to move outward.

[0106] A limiting rib 405 is provided on the side wall of the opening of the medicine bottle holder 4; limiting grooves 603 are provided on both sides of the locking sleeve top rod 6, and the limiting rib 405 is inserted into the limiting groove 603 to limit the locking sleeve top rod 6. Two limiting grooves 603 are provided on each side of the locking sleeve top rod 6, and the two limiting grooves 603 are horizontally arranged. The two limiting grooves 603 correspond to two position states of the locking sleeve top rod 6 respectively:

[0107] Position 1: The limiting rib 405 is inserted into the limiting groove 603 on the outside of the locking sleeve top rod 6;

[0108] Position 2: The limiting rib 405 is inserted into the limiting groove 603 inside the locking sleeve top rod 6;

[0109] The inner and outer sides are defined by the radial direction of the medicine bottle holder 4, with the side closer to the central axis of the medicine bottle holder 4 being the inner side and the side farther from the central axis of the medicine bottle holder 4 being the outer side.

[0110] The lower part of the locking sleeve top rod 6 has a rod-shaped structure, such as... Figure 9 The diagram shows the initial state of the device in this embodiment when it is not in use. At this time, one of the locking bars 302 of the locking sleeve 3 is vertically aligned with the locking sleeve top rod 6; and the width of the locking sleeve top rod 6 is less than the distance between adjacent locking bars 302.

[0111] The helical teeth 301 of the locking sleeve 3 are engaged with the active sliding helical pin 201, which is embedded in the groove 102 of the concealed needle sleeve 1. The helical teeth 301 abut against the sliding limiting surface 101 of the concealed needle sleeve 1, but the tips of the helical teeth 301 are not at the lowest point of the sliding limiting surface 101. However, due to the limitation of the active sliding helical pin 201, the locking sleeve 3 and the concealed needle sleeve 1 are in a stable state at this time.

[0112] A reset element is also sleeved on the outside of the locking sleeve 3. Under the action of the reset element, the helical tooth 301 can rotate with the axial movement of the hidden needle sleeve 1, and the position of the tooth tip of the helical tooth 301 switches between the high point and the low point.

[0113] The reset element is preferably a spring 5. The lower surface of the spring 5 abuts against the upper surface of the first ring, and the upper surface of the spring 5 abuts against the medicine bottle holder 4.

[0114] like Figure 10 The diagram shows the internal structure of the device in its initial state. The outer wall of the rod-shaped structure below the locking sleeve top rod 6 is flush with the outer wall of the medicine bottle holder 4. At this time, the hidden needle sleeve 1 is pushed upward from its lower surface. When the tip of the helical tooth 301 of the locking sleeve 3 is just higher than the active sliding helical pin 201, the initial state switches to the second state, as shown. Figure 11 As shown.

[0115] Figure 11 In the second state shown, due to the rebound of the spring 5, the locking sleeve 3 moves downward, and the tip of the helical tooth 301 abuts against the sliding limiting surface 101 of the hidden needle sleeve 1. Since the tip of the tooth is not located at the low point of the sliding limiting surface 101, the tip of the tooth tends to move towards the low point. Therefore, the locking sleeve 3 moves downward and rotates under the action of the spring.

[0116] After exercise, the second state switches to, as follows: Figure 12In the third state shown, the tip of the helical tooth 301 moves to the lowest point of the sliding limiting surface 101. However, since the side of the helical tooth 301 is not blocked by the active sliding pin 201, the locking sleeve 3 still tends to rotate. Therefore, under the action of the spring 5, the locking sleeve 3 continues to rotate until it returns to its original position. Figure 9 As shown in the initial state, the locking sleeve 3 and the hidden needle sleeve 1 can move freely when not injected.

[0117] When the concealed needle sleeve 1 retracts a large distance within the outer shell of the medicine container, such as Figure 13 As shown, when the hidden needle sleeve 1 starts to move upward from the initial state, it first switches to... Figure 11 The second state is shown, and then it continues to move upward. When the tip of the helical tooth 301 moves to the low point of the sliding limit surface 101, it switches to the second state. Figure 13 In the fourth state shown, the locking sleeve 3 has rotated a certain angle relative to the initial state. At this point, the locking bar 302 and the locking sleeve top rod 6 of the locking sleeve 3 are misaligned, and the gap between the locking sleeve top rod 6 and the locking bar 302 is opposite. The concealed needle sleeve 1 continues to move upward, and the locking sleeve top rod 6 is inserted into the gap between the locking bars 302. At this point, the needle tip protective sleeve of the concealed needle is fully exposed, and the removal of the needle tip protective sleeve can be completed.

[0118] If the device in this embodiment is associated with a host, then in Figure 9 In the state shown, during injection, the hidden needle sleeve 1 retracts inward (moves upward) due to the obstruction of the skin, the automatic injection push rod 103 of the hidden needle sleeve 1 moves upward and extends out of the medicine chamber cap 7, and the automatic injection push rod 103 triggers the injection function of the host. Figure 14 The figure shows an axial cross-sectional view of the push rod slant pin 10 inside the main unit before it comes into contact with the locking sleeve top rod 6. After the injection function of the main unit is triggered, the push rod 9 begins to descend. The push rod slant pins 10 on both sides of the push rod 9 pass through the push rod slant pin insertion hole 704 of the medicine chamber cover 7 and the push rod slant pin insertion hole 404 of the medicine bottle holder 4 in sequence before being inserted into the groove 601 of the locking sleeve top rod 6.

[0119] like Figure 15 As shown, the push rod inclined pin 10 continues to descend. The lower surface of the push rod inclined pin 10 is an inclined surface that cooperates with the inclined surface 602 of the locking sleeve top rod 6. The inclined surface of the push rod inclined pin 10 pushes the locking sleeve top rod 6 outward, causing the locking sleeve top rod 6 to move outward, so that the locking sleeve top rod 6 moves from position one to position two.

[0120] like Figure 16 The diagram shown is a cross-sectional view of the structure at position one. Figure 17The diagram shows the cross-sectional structure at position two. When the locking sleeve top rod 6 is in position one, the limiting rib 405 of the medicine bottle holder 4 is located in the limiting groove 603 on the outside of the locking sleeve top rod 6. As the locking sleeve top rod 6 moves outward, the limiting rib 405 of the medicine bottle holder 4 gradually moves into the limiting groove 603 on the inside of the locking sleeve top rod 6.

[0121] When the locking sleeve top rod 6 moves outward to position two, the locking sleeve top rod 6 protrudes relative to the outer wall of the medicine bottle holder 4. During the outward movement of the locking sleeve top rod 6, the push rod 9 pushes the medicine downward to complete the injection process.

[0122] After the injection is completed, the device of this embodiment is pulled out, at which point the needle is exposed. At the same time, the locking sleeve 3 moves downward under the action of the spring 5, switching to... Figure 18 In the fifth state shown, as the locking sleeve 3 continues to move, the relative positions of the locking sleeve 3 and the hidden needle sleeve 1 return to [the desired state]. Figure 9 The stable state shown is achieved, but the position of the locking sleeve top rod 6 has changed. It slides outward from the receiving groove 403 of the medicine bottle holder 4, so that the lower surface of the locking sleeve top rod 6 is positioned opposite to the locking strip 302 of the locking sleeve 3, switching to the state shown. Figure 19 The sixth state shown.

[0123] Furthermore, the relative positions of locking sleeve 3 and hidden pin sleeve 1 are restored to... Figure 9 After reaching the stable state shown, the concealed needle sleeve 1 hides the concealed needle. Simultaneously, if the concealed needle sleeve 1 is pressed upwards further, the locking sleeve 3, blocked by the locking sleeve push rod 6, prevents the tip of the helical teeth 301 of the locking sleeve 3 from exceeding the active sliding helical pin 201. Therefore, the locking sleeve 3 cannot continue to move upwards or rotate. It can be considered that the concealed needle sleeve 1 and the locking sleeve 3 are in a locked state at this time, thus providing effective anti-puncture protection for the needle tip.

[0124] In addition, after the injection is completed; the distance between the lower surface of the locking sleeve top rod 6 and the upper surface of one of the locking bars 302 is set as d1, the distance between the hidden needle inside the pre-filled medicine bottle 8 and the lower surface of the hidden needle sleeve 1 is set as d2, and the tooth tip height of the helical tooth 301 is set as d3, then d1 < d2, d1 < d3.

[0125] Example 2

[0126] This embodiment provides a device for providing protection against needle punctures after injection, such as... Figure 20 and Figure 30As shown, the device includes a concealed needle sleeve 1, a medicine chamber shell 2, a locking sleeve 3, a medicine bottle support 4, a locking sleeve top rod 6, a medicine chamber cap 7, and a reset element. The medicine chamber shell 2 is a structural component with a through hole inside. The concealed needle sleeve 1 is disposed inside the medicine chamber shell 2, and the concealed needle sleeve 1 extends out of the medicine chamber shell 2 from below. The locking sleeve 3 is disposed above the concealed needle sleeve 1, and the medicine bottle support 4 is disposed inside the locking sleeve 3. The medicine bottle support 4 has a through hole inside, which is used to hold a pre-filled medicine bottle 8. The medicine chamber cap 7 is disposed above the medicine bottle support 4, and the medicine chamber cap 7 is used to press the pre-filled medicine bottle 8.

[0127] The bottom of the locking sleeve 3 and the top of the hidden needle sleeve 1 fit together, and the locking sleeve top rod 6 is provided above the medicine bottle support 4;

[0128] Furthermore, when not injected, the locking sleeve 3 and the hidden needle sleeve 1 can move freely, allowing the hidden needle inside the pre-filled vial 8 to be exposed or hidden.

[0129] After the injection is completed, the locking sleeve top rod 6 can lock the locking sleeve 3, so that the hidden needle inside the pre-filled medicine bottle 8 cannot be exposed.

[0130] The entire device, providing protection for the concealed needle and post-injection needle tip, is a disposable pharmaceutical packaging material. When not being injected, the concealed needle sleeve 1 can move freely, allowing for the removal of the needle protector, abnormal contact, and needle insertion, causing the concealed needle sleeve 1 to retract and expose the needle, while simultaneously completing the injection. After injection, the locking sleeve 3 is locked, preventing the concealed needle sleeve 1 from moving freely and thus preventing the concealed needle inside the pre-filled vial 8 from being exposed. This avoids needle tip injury to the operator and also eliminates the risk of reusing the device.

[0131] like Figure 21 The diagram shows the structure of the locking sleeve 3. The locking sleeve 3 is a cylindrical structure. An annular groove 303 is provided on the lower outer wall of the locking sleeve 3, and a helical inclined surface 305 is provided on the upper part of the locking sleeve 3. In this embodiment, two helical inclined surfaces 305 are provided, each having a bottom surface 3511 and a top surface 3512. Additionally, a thread 304 is provided on the inner wall of the locking sleeve 3, and the helical direction of the thread 304 is the same as that of the helical inclined surface 305.

[0132] like Figure 22 The diagram shows the structure of the hidden needle sleeve 1. A buckle 104 is provided on the top of the hidden needle sleeve 1, and the buckle 104 is inserted into the annular groove 303. An automatic injection rod 103 is also provided on the top of the hidden needle sleeve 1. The automatic injection rod 103 cooperates with the main unit to activate the automatic injection function in the main unit. The main unit is an electronic injection pen that cooperates with the device that provides hidden needle and needle tip anti-puncture protection after injection in this embodiment.

[0133] In addition, a guide groove 105 is provided on the upper edge of the hidden needle sleeve 1 for cooperating with the outer shell 2 of the medicine compartment.

[0134] like Figure 23 The diagram shows the structure of the medicine container shell 2. A guide bar 202 is provided on the inner wall of the medicine container shell 2. The guide bar 202 is embedded in the guide groove 105 of the hidden needle sleeve 1, preventing the hidden needle sleeve 1 from rotating relative to the medicine container shell 2. Therefore, the hidden needle sleeve 1 can only move axially relative to the medicine container shell 2. A limiting rib 207 is also provided on the inner wall of the medicine container shell 2 to limit the rotation of the medicine bottle support 4.

[0135] In addition, a buckle 206 is provided on the inner wall above the outer shell 2 of the medicine compartment. The buckle 206 presses against the upper edge of the medicine compartment cover 7, so that the medicine compartment cover 7 is tightly installed on the outer shell 2 of the medicine compartment.

[0136] like Figure 24 The diagram shows the structure of the medicine bottle holder 4. The medicine bottle holder 4 includes an upper end plate 401 and a sleeve 402 connecting the end plate 401. The sleeve 402 is used to set a pre-filled medicine bottle 8. A spiral groove 407 is provided on the outside of the sleeve 402. The thread 304 on the inner wall of the locking sleeve 3 is inserted into the spiral groove 407, so that the locking sleeve 3 moves up and down and also rotates.

[0137] A limiting groove 406 is provided on the outer edge of the end plate 401 of the medicine bottle holder 4. The limiting rib 207 of the medicine chamber shell 2 is embedded in the limiting groove 406 on the outer edge of the end plate 401 to limit the rotation of the medicine bottle holder 4. In addition, a push rod inclined pin insertion hole 404 is provided on the end plate 401. The push rod inclined pin insertion hole 404 corresponds to the position of the locking sleeve top rod 6 in the axial direction, specifically to the position of the top block 604 of the locking sleeve top rod 6. The host connected to the device of this embodiment has a push rod 9, and push rod inclined pins 10 are provided on both sides of the push rod 9. During injection, the push rod 9 is inserted into the through hole in the center of the medicine bottle holder 4 to push the liquid medicine in the pre-filled medicine bottle 8. The push rod inclined pins 10 are inserted into the push rod inclined pin insertion hole 404 to lock the locking sleeve 3.

[0138] An clearance hole is provided on one side of the end plate 401 to allow the automatic injection rod 103 of the concealed needle sleeve 1 to pass through; two protrusions are also provided on the upper surface of the end plate 401, and a cover plate is provided above the pre-filled medicine bottle 8. The two sides of the cover plate are flat and the cover plate is embedded between the two protrusions to restrict the rotation of the pre-filled medicine bottle 8. The medicine tank cap 7 is covered on the cover plate of the pre-filled medicine bottle 8 to fix the pre-filled medicine bottle 8.

[0139] like Figure 25 The diagram shows the structure of the locking sleeve top rod 6. The locking sleeve top rod 6 includes a connecting ring and two top blocks 604, which are respectively disposed on both sides above the medicine bottle holder 4.

[0140] A receiving groove 403 is provided on the upper side wall of the medicine bottle holder sleeve 402, and the top block 604 is provided in the receiving groove 403; two snap-fit ​​grooves 408 are provided on each receiving groove 403 at vertical intervals, and a limiting buckle 605 is provided on the inner side of the top block 604, and the limiting buckle 605 can be snapped into the snap-fit ​​groove 408.

[0141] The locking sleeve 3 is also fitted with a reset element. Under the action of the reset element, the locking sleeve 3 can move axially with the axial movement of the hidden needle sleeve 1. The locking sleeve 3 also has rotational movement while moving axially.

[0142] The reset element is a spring 5. A spring limiting sleeve 11 is also provided outside the locking sleeve 3. The upper surface of the spring limiting sleeve 11 abuts against the upper edge of the medicine bottle holder 4, the lower surface of the spring limiting sleeve 11 abuts against the upper part of the spring 5, and the lower part of the spring 5 abuts against the hidden needle sleeve 1. Furthermore, the lower surface of the spring limiting sleeve 11 also abuts against the upper surface of the guide strip 202 of the medicine compartment shell 2, thereby confining the spring limiting sleeve 11 between the guide strip 202 and the end plate 401 of the medicine bottle holder 4.

[0143] The medicine compartment cover 7 in this embodiment has the same structure as the medicine compartment cover 7 in Embodiment 1, and the connection between the medicine compartment cover 7 and the medicine compartment shell 2 is also the same.

[0144] like Figure 26 As shown, in the initial state, the top block 604 corresponds to the top surface 3512 of one of the spiral inclined surfaces 305; at this time, the limiting buckle 605 of the top block 604 is engaged in the upper buckle groove 408, that is, the position of the top block 604 at this time is called position one. In addition, in the initial state, the hidden needle is hidden inside the hidden needle sleeve 1.

[0145] When the hidden needle sleeve 1 is pushed upward from its lower surface, it moves axially within the confinement of the drug cartridge housing 2. The locking sleeve 3, due to the engagement of the thread 304 and the helical groove 407, moves in a helical motion. Therefore, the device in this embodiment switches from its initial state to... Figure 27 In the second state shown, after the hidden needle sleeve 1 rises a certain distance, the hidden needle is exposed. At this time, the needle tip protective sleeve of the hidden needle can be removed.

[0146] When the hidden needle sleeve 1 is released, under the action of spring 5, spring 5 compresses the locking sleeve 3 and moves it downward. The locking sleeve 3 spirals downward, and the hidden needle sleeve 1 moves axially downward. The locking sleeve 3 and the hidden needle sleeve 1 then return to their original positions. Figure 26 As shown, in the non-injection state, the hidden needle sleeve 1 can move freely, and abnormal touches will not cause the hidden needle sleeve 1 or the locking sleeve 3 to lock.

[0147] When the device of this embodiment is connected to the host, an injection is performed. The hidden needle sleeve 1 moves upward relative to the hidden needle under the obstruction of the skin. When the automatic injection push rod 103 triggers the automatic injection function of the host, the push rod 9 begins to descend. The push rod inclined pins 10 on both sides of the push rod 9 pass through the push rod inclined pin insertion hole 704 of the medicine chamber cover 7 and the push rod inclined pin insertion hole 404 of the medicine bottle holder 4 in sequence, and then contact the top block 604 of the locking sleeve push rod 6.

[0148] As push rod 9 continues downward, push rod inclined pin 10 pushes top block 604, causing locking sleeve push rod 6 to move downward. The limiting buckle 605 of top block 604 disengages from the upper latching groove 408 and moves downward along receiving groove 403 until the limiting buckle 605 engages in the lower latching groove 408. This position of top block 604 is called position two. Figure 28 The third state is shown. Furthermore, the top block 604 is embedded between the two spiral inclined surfaces 305, positioned opposite the bottom surface 3511, at which point the injection is complete.

[0149] After the needle is removed, the locking sleeve 3 returns to its original position under the action of the spring 5. After returning to its original position, the locking sleeve 3 rotates to... Figure 29 In the state shown, the top surface 3512 of the spiral inclined surface 305 is positioned opposite to the top block 604. If the hidden needle sleeve 1 is pushed upward, the hidden needle sleeve 1 and the locking sleeve 3 cannot move upward due to the obstruction of the top block 604, thus locking the locking sleeve 3 and the hidden needle sleeve 1, which can effectively protect the needle from puncture.

[0150] Example 3

[0151] This embodiment provides a pre-filled syringe, including the device provided in Embodiment 1 or Embodiment 2 that provides concealed needle and needle puncture protection after injection.

[0152] The above specific embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A device for providing a needle concealment and post-injection needle stick protection, the device comprising: The device includes a concealed needle sleeve, a medicine chamber shell, a locking sleeve, a medicine bottle holder, and a locking sleeve top rod. The concealed needle sleeve is disposed inside the medicine chamber shell, with the lower part of the concealed needle sleeve extending out of the medicine chamber shell. The locking sleeve is disposed above the concealed needle sleeve, and the medicine bottle holder is disposed inside the locking sleeve. The medicine bottle holder is used to hold pre-filled medicine bottles. The bottom of the locking sleeve and the top of the concealed needle sleeve are interlocked, and the locking sleeve top rod is disposed above the medicine bottle holder. Furthermore, when not injected, the locking sleeve and the hidden needle sleeve can move freely, allowing the hidden needle inside the pre-filled vial to be exposed or hidden. After the injection is completed, the locking sleeve top rod can lock the locking sleeve, so that the hidden needle inside the pre-filled vial cannot be exposed.

2. The device of claim 1, wherein, The lower surface of the locking sleeve is provided with circumferentially distributed helical teeth, and the upper surface of the concealed needle sleeve is provided with a sliding limiting surface that cooperates with the helical teeth. The sliding limiting surface has a high point and a low point, and the connecting surface between the high point and the low point is an inclined surface. A reset element is also sleeved on the outside of the locking sleeve. Under the action of the reset element, the helical teeth can rotate with the axial movement of the concealed needle sleeve, and the position of the tooth tip of the helical teeth switches between the high point and the low point.

3. The device for providing protection against needle puncture after injection and for concealed needles according to claim 2, characterized in that, An active sliding inclined pin is provided inside the outer shell of the medicine container, and a sliding groove is provided on the side wall of the sliding limiting surface above the hidden needle sleeve, and the active sliding inclined pin can be embedded in the sliding groove.

4. The device of claim 2, wherein the needle guard is formed of a material that is transparent to radio frequency signals. The reset element is a spring; The locking sleeve includes a lower first ring and an upper second ring, the outer diameter of the first ring is larger than the outer diameter of the second ring, and the helical teeth are provided on the lower surface of the first ring; The lower surface of the spring abuts against the upper surface of the first ring, and the upper surface of the spring abuts against the medicine bottle holder.

5. The device of claim 4, wherein the needle guard is formed of a material that is transparent to radio frequency signals. The second ring is provided with several locking bars. In the initial state, one of the locking bars corresponds vertically to the locking sleeve top rod; and the width of the locking sleeve top rod is less than the distance between adjacent locking bars. After the injection is completed; the distance between the lower surface of the locking sleeve top rod and the upper surface of one of the locking bars is set as d1, the distance between the hidden needle inside the pre-filled medicine bottle and the lower surface of the hidden needle sleeve is set as d2, and the tip height of the helical tooth is set as d3. Then d1 < d2, d1 < d3.

6. The device of claim 1, wherein: The inner wall of the medicine container shell is provided with two guide strips, and the sliding groove of the hidden needle sleeve is between the two guide strips; an automatic injection push rod is provided on one side of the hidden needle sleeve, and the automatic injection push rod is embedded in the sliding groove of the hidden needle sleeve.

7. The device of claim 1, wherein the device further comprises a needle guard. The inner wall of the medicine container shell is also provided with a hidden needle sleeve limiting strip, and a step is provided above the hidden needle sleeve. The upper surface of the hidden needle sleeve limiting strip is used to limit the step.

8. The device of claim 1, wherein: The device for providing protection against needle puncture after injection and for preventing needle tip puncture also includes a medicine chamber cap, which is provided on the upper surface of the medicine bottle support; a buckle is provided on the inner wall above the medicine chamber shell, and the buckle presses against the upper edge of the medicine chamber cap.

9. The device of claim 1, wherein the device further comprises a needle guard. The number of locking sleeve top rods is 2, and the two locking sleeve top rods are respectively arranged on both sides above the medicine bottle support; The medicine bottle holder includes an upper end plate and a sleeve connecting the end plate. The sleeve is used to hold a pre-filled medicine bottle. A receiving groove is provided on the upper side wall of the sleeve, and the locking sleeve top rod is provided in the receiving groove.

10. The device of claim 9, wherein the needle is a hypodermic needle. A push rod inclined pin insertion hole is provided above the end plate, and the push rod inclined pin insertion hole corresponds to the position of the locking sleeve top rod in the axial direction. The upper surface of the locking sleeve top rod is provided with a downward groove, and the inner wall of the outer side of the groove is a slope. The main unit that cooperates with the device that provides protection against needle puncture after injection has a push rod angled pin. The push rod angled pin is inserted into the groove after passing through the push rod angled pin insertion hole.

11. The device of claim 9, wherein the needle guard is formed of a material that is transparent to radio frequency signals. A limiting plate extends downward from the lower surface of the end plate. An opening is provided on the limiting plate to avoid the locking sleeve top rod. A limiting rib is provided on the side wall of the opening. Limiting grooves are provided on both sides of the locking sleeve top rod, and the limiting ribs are inserted into the limiting grooves. Two limiting grooves are provided on each side of the locking sleeve top rod, and the two limiting grooves are set horizontally.

12. The device of providing a hidden needle and protection against needle stick after injection of claim 1, wherein, An annular groove is provided on the lower outer wall of the locking sleeve, and a buckle is provided on the upper part of the concealed needle sleeve, the buckle being engaged in the annular groove; a spiral groove is provided on the outer wall of the medicine bottle holder, and a thread is provided on the inner wall of the locking sleeve, the thread being engaged in the spiral groove; A reset element is also fitted outside the locking sleeve. Under the action of the reset element, the locking sleeve can move axially with the axial movement of the hidden needle sleeve. The locking sleeve also has rotational movement while moving axially.

13. The device of claim 12, wherein: The reset element is a spring, and a spring limiting sleeve is also provided outside the locking sleeve. The upper surface of the spring limiting sleeve abuts against the upper edge of the medicine bottle holder, the lower surface of the spring limiting sleeve abuts against the upper part of the spring, and the lower part of the spring abuts against the hidden needle sleeve.

14. The device of claim 12, wherein the needle is a hollow needle. The device for providing protection against needle puncture after injection and for preventing needle tip puncture also includes a medicine chamber cap, which is provided on the upper surface of the medicine bottle support; a buckle is provided on the inner wall above the medicine chamber shell, and the buckle presses against the upper edge of the medicine chamber cap. The locking sleeve top rod includes a connecting ring and two top blocks, which are respectively disposed on both sides above the medicine bottle holder.

15. The device of claim 14, wherein: The medicine bottle holder includes an upper end plate and a sleeve connecting the end plate. The sleeve is used to hold a pre-filled medicine bottle. A receiving groove is provided on the upper side wall of the sleeve, and the top block is provided in the receiving groove. Each receiving groove is provided with two locking grooves spaced apart vertically. A limiting buckle is provided on the inner side of the top block, and the limiting buckle can be locked into the locking groove.

16. The apparatus of claim 15, wherein: A push rod inclined pin insertion hole is provided above the end plate, and the push rod inclined pin insertion hole corresponds to the position of the top block in the axial direction.

17. The apparatus of claim 16, wherein: Two spiral inclined surfaces are provided above the locking sleeve. In the initial state, the top block corresponds to the top surface of one of the spiral inclined surfaces. After injection, the top block is embedded between the two spiral inclined surfaces.

18. A pre-filled syringe, characterized in that Includes the device according to any one of claims 1-17 that provides protection against needle puncture after injection.

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