Ribbed needle cylinder disc and pre-filled syringe

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a ribbed needle cylinder disc and a pre-filled syringe. The stiffened needle cylinder disc is used for mounting a needle, is communicated with a needle cylinder to allow liquid to circulate, and comprises a disc, and the far end side of the disc is provided with a plane; the interval step is arranged on the side face of the far end of the disc and used for jacking up the protective cap; the interval step comprises an interval rib and a stop rib; the spacing ribs are arranged along the diameter of the far-end side face of the disc, and the stop ribs are arranged on the two sides of the spacing ribs. The protective cap has the advantages that the protective cover and the protective cap can be separated by the spacing rib, so that the sliding of the protective cover can be prevented from being accidentally triggered when the protective cap is pulled out, the risk of misoperation can be reduced, and an operator can safely pull out the protective cap without interfering with the position of the protective cover; and due to the arrangement of the stop ribs, when the protective cover has a side-tipping phenomenon or a side-tipping trend, the side-tipping angle of the protective cover can be reduced, so that the radial falling phenomenon is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a reinforced syringe disc and a prefilled syringe. Background Art

[0002] Prefilled syringes are injection devices used in the medical field that integrate the functions of syringes and drug containers. This type of syringe has been pre-filled with drugs during the production process, and the purity and effectiveness of the drugs are protected by sealing. The design of pre-filled drugs makes it more convenient and quick for medical staff to use them, reducing the time and steps for preparing drugs. And because prefilled syringes are disposable, they can avoid the risk of cross infection and improve patient safety. In addition, strict sealing measures are taken during the production process of prefilled syringes, which can effectively protect the purity and stability of drugs and extend the shelf life of drugs.

[0003] The main components of a prefilled syringe include the syringe body, drug container, piston, needle and protective cap. The syringe body is usually made of transparent material, so that medical staff can clearly observe the dosage and status of the drug solution. The drug container is generally made of glass or plastic, and the capacity is determined according to the needs, and different doses of drugs can be filled. The piston is used to push the drug into the needle and inject it. The needle is used to inject the drug into the patient's body. The protective cap is used to protect the needle before and after use.

[0004] However, the existing prefilled syringes are often discarded at will after use, and the needle is exposed, which is very dangerous. In order to solve the problem of the needle being exposed after the syringe is discarded, the operator often puts the removed protective cap back on. However, this has many disadvantages. On the one hand, the protective cap is customized for the needle, and the opening is small, so it is difficult to reinsert it after it is pulled out. On the other hand, the needle can easily prick the operator's hand during the reinstallation process.

[0005] In order to solve the above problems, the inventor has previously applied for an invention patent in the relevant field, specifically CN117180556B, a protective prefilled syringe, the protective cover can adjust the axial position by pushing and pulling, which is used to expose the needle to complete the injection, and to cover the needle and discard it after the injection is completed to avoid needle pricks to others. In particular, the application sets a spacing step for lifting the needle cover on the reinforced syringe disc, wherein the existence of the spacing step makes the needle cover not completely close to the distal end surface of the convex ridge when it is connected to the needle, so that when the protective cover unit is pulled up along the proximal end to completely expose the needle cover, there is no overlapping part between the needle cover and the protective cover unit, that is, when the needle cover is pulled out along the axial direction, the protective cover unit will not be driven to move at all, avoiding the phenomenon of accidentally driving the protective cover unit when the needle cover is pulled out.

[0006] However, the above syringe was found in actual use.Fig.16 , 17 The existence of the spacing steps will cause the protective cover to tilt during installation, so that the protective cover may be out of engagement with the convex ridge and expose the injection needle, thereby losing the original function of preventing needle sticks.

[0007] Therefore, a component that can effectively prevent the protective cover from tilting during installation is currently needed to solve this problem. Summary of the invention

[0008] The invention aims to provide a reinforced syringe disc and a prefilled syringe.

[0009] The technical solution adopted by the present invention to solve the above problems is: a reinforced syringe disc, used to install the needle and connected with the syringe to allow liquid to flow, comprising: a disc, the distal side of the disc having a flat surface; A spacer step is provided on the distal side of the disc and is used to lift the protective cap; The spacing step comprises a spacing rib and a stop rib; the spacing rib is arranged along the diameter of the distal side surface of the disc, and the stop rib is arranged on both sides of the spacing rib.

[0010] Among them, based on the spacing steps with only cross protrusions and cross ribs on the distal side of the disc of CN117180556B, the present application uses the original spacing steps as spacing ribs, and then adds stop ribs on the left and right sides of the spacing ribs. In this way, after the protective cover covers the injection needle again to the distal end, the cantilever will form at least three contact points with the spacing ribs and the stop ribs on both sides in a fixed position. In this way, when the protective cap is bent radially, single-point support at the contact position between the cantilever and the spacing rib can be avoided, which greatly reduces the shaking gap of the protective cover, thereby effectively preventing the protective cover from falling off radially and improving the overall safety of the product.

[0011] It should be noted that "radial bending" refers to the bending of the protective cover along the vertical direction of the syringe axis. The specific reasons include: 1. The tolerances generated during the manufacturing process result in a certain gap between the protective cover and the disc after they are engaged; 2. The material of the protective cover itself has a certain elasticity, and in the case of human error, it can bend in the direction perpendicular to the axis of the syringe.

[0012] A further preferred technical solution is that the spacing ribs and the stop ribs have the same height.

[0013] Among them, the spacing ribs and the stop ribs are set to have the same height in order to achieve the three-point support technical effect of the protective cover.

[0014] "Consistent height" generally refers to multiple elements in a structure or component, such as spacer ribs and stop ribs, that have the same vertical dimension or height. This means that the distance from a reference plane, such as the far side of a disk, to their highest point is the same. Although the heights of the two cannot be completely consistent in a mathematical sense, there may be slight manufacturing tolerances, but in terms of functional use, these height differences will not affect the overall performance or function. This means that even if there are some minor height variations, as long as the function can be achieved, it can still be called "consistent height".

[0015] A prefilled syringe, comprising the above-mentioned reinforced syringe disc, is characterized in that it also includes: Syringes, used to package liquids; A needle, mounted on the needle seat of the convex ridge member and connected to the syringe to allow liquid to flow; The needle sleeve unit is at least partially sleeved on the needle barrel and at least partially sleeved on the ridge piece; A protective cap is at least partially sleeved on the needle hub to completely sleeve the needle; The spacing steps prevent the protective cap from being completely in close contact with the distal end surface of the ridge member when the protective cap is sleeved on the needle, and when the needle sleeve unit is pulled up along the proximal end to completely expose the protective cap, there is no overlapping portion between the protective cap and the needle sleeve unit.

[0016] A further preferred technical solution is that the needle cover unit includes a protective cover and a shrink ring arranged at the distal end of the protective cover and used for engaging the convex ridge piece.

[0017] A further preferred technical solution is that the convex ridge member includes a distal stop surface, a proximal stop surface, and a side stop surface for connecting the distal stop surface and the proximal stop surface.

[0018] A further preferred technical solution is that the spacing step is arranged on the distal stop surface.

[0019] A further preferred technical solution is that: the shrink ring includes a distal stop ring surface and a proximal stop ring surface; the maximum diameter of the distal stop ring surface is smaller than the minimum diameter of the proximal stop ring surface.

[0020] A further preferred technical solution is that the minimum diameter of the distal stop ring surface is greater than the maximum diameter of the distal stop surface.

[0021] A further preferred technical solution is that the maximum diameter of the distal stop ring surface is smaller than the minimum diameter of the proximal stop surface.

[0022] A further preferred technical solution is that a positioning ring is provided at the proximal end of the protective cap, and the minimum outer diameter of the positioning ring is greater than the maximum inner diameter of the distal stop ring surface.

[0023] A further preferred technical solution is that the needle cover unit further comprises a cantilever provided at the proximal end of the protective cover and used to lift up the distal stop surface, and a stop hook provided at the proximal end of the protective cover and used to engage the proximal stop surface.

[0024] A further preferred technical solution is that it also includes an expansion step disposed on the needle seat and used for installing the protective cap.

[0025] A further preferred technical solution is that the expansion step is connected to the spacing step.

[0026] A further preferred technical solution is that two, three, or four spacing steps are provided, and the angles between the spacing steps are equal.

[0027] A further preferred technical solution is that a guiding slope is provided at the distal end of the syringe.

[0028] A further preferred technical solution is that the protective cap material includes one or more combinations of polypropylene, polyethylene, and polystyrene.

[0029] In summary, the present invention has the following benefits: 1. Avoid misoperation: The spacer ribs can separate the position of the protective cover from the protective cap to avoid accidentally triggering the sliding of the protective cover when removing the protective cap. This can reduce the risk of misoperation and ensure that the operator can safely remove the protective cap without disturbing the position of the protective cover.

[0030] 2. Prevent the protective cover from falling off: The setting of the stop rib can reduce the tilt angle of the protective cover when the protective cover has a tilting phenomenon or a tendency to tilt, so as to prevent the radial falling off from occurring.

[0031] 3. Improve stability: By separating the protective cover from the protective cap, it can ensure that the protective cover remains stable during the process of removing the protective cap. This can prevent the protective cover from accidentally sliding or falling to the far end, reduce the false triggering rate, and improve overall safety.

[0032] 4. Convenient and fast: The design of separating the protective cover and the protective cap can make the operation more convenient and quick. The operator can focus on pulling off the protective cap without paying extra attention to the position of the protective cover. This can save time and energy and improve operating efficiency.

[0033] 5. Simplify design and manufacturing: Separating the position of the protective cover from the protective cap can simplify the overall design and manufacturing process. There is no need to consider the coupling and coordination between the protective cap and the protective cover, which reduces manufacturing costs and complexity.

[0034] In general, completely separating the protective cover from the protective cap can avoid misoperation, improve safety, convenience, and simplify the design and manufacturing process. This design can further enhance the safety and ease of use of prefilled syringes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a protective prefilled syringe.

[0036] Figure 2 for Figure 1 Schematic diagram of the explosion of a medium-protected prefilled syringe.

[0037] Figure 3 for Figure 1 Schematic diagram of the cross section of the medium-protected prefilled syringe along line AA'.

[0038] Figure 4 for Figure 3 Schematic diagram of the needle sleeve unit sliding toward the proximal end.

[0039] Figure 5 for Figure 4 Schematic diagram of the enlarged area C in the middle.

[0040] Figure 6 It is a schematic diagram of the structure of the syringe and the reinforced syringe disc.

[0041] Figure 7 Schematic diagram of the cross-sectional structure of the syringe and the reinforced syringe disc Figure 8 It is a schematic diagram of the structure of the needle sleeve unit.

[0042] Fig. 9 It is a schematic diagram of the cross-sectional structure of the needle sleeve unit.

[0043] Fig.10 It is a schematic diagram of the structure of the protective cap.

[0044] Fig.11 for Figure 7 Schematic diagram of the enlarged area B in the middle.

[0045] Fig.12 for Fig.11 Schematic diagram of the front view of the cross section of the medium-reinforced syringe disc.

[0046] Fig.13 Schematic diagram of the needle sleeve unit snapping into place on the reinforced syringe disc after the protective cap is removed.

[0047] Fig.14 It is a schematic diagram of the protective cover in a vertical state when the convex ridge member is provided with spacing ribs and stop ribs.

[0048] Fig.15It is a schematic diagram of the protective cover being in an inclined state when the convex ridge member is provided with spacing ribs and stop ribs.

[0049] Fig.16 It is a schematic diagram of the protective cover in a vertical state when only spacing ribs are provided on the convex ridge member.

[0050] Fig.17 It is a schematic diagram showing that the protective cover is in an inclined state when only spacing ribs are provided on the convex ridge member.

[0051] In the accompanying drawings, the components represented by the various reference numerals are as follows: syringe 1, needle, needle sleeve unit 4, protective cap 5, guide ramp 101, convex ridge 201, spacing step 202, needle seat 203, expansion step 204, protective cover 401, shrink ring 402, cantilever 403, stop hook 404, indicating ring 501, distal stop surface 201a, proximal stop surface 201b, side stop surface 201c, spacing rib 202a, stop rib 202b, distal stop ring surface 402a, proximal stop ring surface 402b. DETAILED DESCRIPTION

[0052] definition: 1. Distal end: refers to the syringe and the various components installed on the syringe in the normal way, which is facing the needle end.

[0053] 2. Proximal end: refers to the syringe and the various components installed on the syringe in a normal manner, which is farthest from the needle.

[0054] 3. Axis: refers to the line connecting the centroids of all cross sections of a component with symmetrical cross-sections.

[0055] 4. Open: refers to the ability to expose the needle or protective cap during operation.

[0056] 5. Closure: refers to the ability to cover the needle or cap during operation.

[0057] 6. Socket connection: refers to the act of installing component one on the outer surface of component two when the inner diameter of component one is larger than the outer diameter of component two.

[0058] 7. Setting: refers to any method used to combine two parts together, such as bonding, snapping, welding, screwing, placement, etc.

[0059] 8. Lifting: It means that component one exerts force on component two, causing component two to move in the direction opposite to the position of component one.

[0060] 9. Minimum / maximum diameter: For some components with obvious axes, the cross section is made along the vertical direction of the axis. The cross section is approximately circular or polygonal. The narrowest part of the cross section is the minimum diameter of the component, and the widest part of the cross section is the maximum diameter of the component. The minimum diameter of the same cross section should not be greater than its maximum diameter.

[0061] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0062] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0063] Example: In this embodiment, the reinforced syringe disc, used to mount the needle and connected with the syringe 1 to allow liquid to flow, includes: A convex rib member 201, wherein the distal end side of the convex rib member 201 has a flat surface; The spacing step 202 is provided on the distal side of the convex ridge member 201 and is used to lift the protective cap 5; The spacing step 202 includes a spacing rib 202a and a stop rib 202b; the spacing rib 202a is arranged along the diameter of the distal side of the convex ridge member 201, and the stop rib 202b is arranged on both sides of the spacing rib 202a, and the spacing rib 202a and the stop rib 202b have the same height.

[0064] refer to Figure 6 The stop rib 202b is arranged on the spacing rib 202a in a manner that it is parallel to one of the spacing ribs 202a and is arranged on both sides thereof. When observing the distal end surface of the ridge member 201 from a top view, as shown in FIG. Figure 6 As shown, it can be seen that it has three vertically distributed ribs and one transversely distributed rib, wherein the three vertically distributed ribs are arranged in a basically parallel manner.

[0065] It should be noted that the ends of the spacing ribs 202a and the stop ribs 202b are both located within the plane of the distal side surface of the convex rib 201, and do not exceed its range. The specific meaning of being located within the plane is that, from a top view, the ends of the spacing ribs 202a and the stop ribs 202b do not exceed the circular projection formed by the convex rib 201.

[0066] A prefilled syringe comprising a reinforced barrel disc and further comprising: Syringe 1, needle, needle cover unit 4, protective cap 5, wherein: The needle cover unit 4 includes a protective cover 401 and a shrink ring 402 .

[0067] refer to Figure 1 , showing a schematic diagram of the structure of a protective prefilled syringe. It can be seen that the syringe 1 is used to encapsulate liquid; the needle cover unit 4 is at least partially sleeved on the syringe 1. The figure shows that the protective prefilled syringe is in an unused state, the needle cover unit 4 is sleeved on the syringe 1 and completely covers the protective cap 5, wherein the needle cover unit 4 is coaxially arranged with the syringe 1 and can slide along the syringe 1 toward the proximal end.

[0068] refer to Figure 2 , showing Figure 1 Schematic diagram of the explosion of the protective prefilled syringe. It can be seen that the reinforced syringe disc is installed at the distal end of the syringe 1; the needle is installed on the reinforced syringe disc and is connected to the syringe 1 to allow liquid to flow; the protective cap 5 is used to cover the needle. In order to facilitate the display of other structures, the needle is not shown in the figure, but the specific position of the needle installed on the reinforced syringe disc can be imagined through the general syringe. It can be seen that the syringe 1, the reinforced syringe disc, the needle sleeve unit 4 and the protective cap 5 all have a common axis.

[0069] refer to Figure 3 , showing Figure 1 Schematic diagram of the cross section of the protective prefilled syringe along the AA' line. It can be seen that the syringe 1 has a cylindrical hollow structure for encapsulating liquids. The syringe 1 is also provided with an injection piston used in general syringes. The injection piston is pushed to push the liquid medicine into the reinforced syringe disc. The axis of the reinforced syringe disc has a channel connected to the cylindrical cavity in the syringe 1. The channel is also connected to the hollow structure in the needle. The liquid entering the reinforced syringe disc can complete the injection process through the needle. It can be seen that the needle sleeve unit 4 is at least partially sleeved on the syringe 1 and at least partially sleeved on the reinforced syringe disc, and the protective cap 5 is at least partially sleeved on the reinforced syringe disc to completely sleeve the needle.

[0070] refer to Figure 4 , showing Figure 3 Schematic diagram of the middle needle cover unit sliding toward the proximal end. This step is to expose the protective cap 5 to the outside, so as to facilitate the next step of removing the protective cap toward the distal end and exposing the needle for injection.

[0071] refer to Figure 6 , showing a schematic diagram of the structure of a syringe and a reinforced syringe disc. It can be seen that the reinforced syringe disc includes a convex rib 201 and a spacer step 202 arranged on the distal end surface of the convex rib 201. The figure shows a scene in which four spacer steps 202 are arranged on the distal end surface of the convex rib 201, and the angle between each spacer step 202 is 90° refer to Figure 8, showing a schematic diagram of the structure of the needle sheath unit. It can be seen that the needle sheath unit 4 includes a protective cover 401, and a shrink ring 402 disposed at the distal end of the protective cover 401. It can be seen that the structure of the shrink ring 402 gradually shrinks from the proximal end to the distal end, and a distal stop ring surface 402a is formed when the shrink ring 402 shrinks to the farthest end, and conversely, a proximal stop ring surface 402b is formed where the shrink ring 402 begins to shrink.

[0072] refer to Fig.11 , showing Figure 7 The enlarged schematic diagram of the middle area B. It can be seen that the convex ridge member 201 gradually expands outward from the distal end to the proximal end, that is, a truncated cone structure is formed, and the truncated cone has a bottom surface with a smaller area and a bottom surface with a larger area. The bottom surface with a smaller area is the distal end stop surface 201a, and the bottom surface with a larger area is the proximal end stop surface 201b. The arc-shaped side surface of the truncated cone constitutes the side end stop surface 201c.

[0073] refer to Figure 5 , showing Figure 4 The enlarged schematic diagram of the middle area C. It can be seen that when the protective cover 401 is pulled toward the proximal end until the shrink ring 402 contacts the convex ridge 201, the distal stop ring surface 402a can pass over the distal stop surface 201a because the minimum diameter of the distal stop ring surface 402a is greater than the maximum diameter of the distal stop surface 201a; and the maximum diameter of the distal stop ring surface 402a is smaller than the minimum diameter of the proximal stop ring surface 402b. Therefore, the distal stop ring surface 402a cannot pass over the proximal stop ring surface 402b, and finally, the distal stop ring surface 402a stays and abuts against the side stop surface 201c. And due to the existence of the spacing step 202, the proximal end of the protective cap 5 does not abut against the distal stop surface 201a, so the shrink ring 402 is completely separated from the protective cap 5, that is, the process of pulling off the protective cap 5 will not affect the protective cover 401 at all. And because the distal stop ring surface 402a cannot go over the proximal stop ring surface 402b, no matter how the operator pulls the protective cover 401, the protective cover 401 will not be directly pulled completely onto the syringe 1. The advantage of this is that the protective cover 401 is always at the distal end of the syringe, which is convenient for the operator to operate with one hand.

[0074] refer to Fig.14 , 15 When the convex rib 201 is supported only by the single-point rib position of the spacing rib 202a and the protective cap is bent perpendicularly to the axial direction, the cantilever 403 swings left and right, and the cantilever 403 and the stop hook 404 are in contact with the convex rib 201. As the shaking or bending force increases, they will be separated from the convex rib 201, causing the protective function of the protective cover 401 to fail.

[0075] refer to Fig.16 , 17When the convex rib part 201 is provided with a stop rib 202b in addition to the spacing rib 202a, the rib support is provided on the entire circumference of the convex rib part 201. At this time, when the protective cover 401 is bent perpendicularly to the axial direction, the left and right shaking of the protective cover 401 can be effectively suppressed, so that the cantilever 403, the stop hook 404 and the convex rib part 201 are better fitted, and the protective cover 401 is better able to prevent it from falling off.

[0076] In addition, in another embodiment, the stop rib 202b may not be arranged parallel to the spacing rib 202a, but may be arranged between the two spacing ribs 202a, along their diagonal, or at any slope, as long as it can ensure the anti-detachment effect of the protective cover 401.

[0077] In addition, in another embodiment, a plurality of stop ribs 202b are provided on the spacing ribs 202a, for example, 2 on one side for a total of 4, or 3 on one side for a total of 6, as long as the protective cover 401 can be prevented from falling off.

[0078] In addition, in another embodiment, the width of the stop rib 202b can be set arbitrarily, and can be 0.5 times wider, 1.5 times wider, or 2 times wider than the spacing rib 202a, as long as it can ensure the anti-dropping effect of the protective cover 401.

[0079] Embodiment 2 In this embodiment, the structure of the protective prefilled syringe is substantially the same as that of the first embodiment, except that the minimum outer diameter of the protective cap 5 is greater than the maximum inner diameter of the distal stop ring surface 402a.

[0080] refer to Fig.10 , showing a schematic diagram of the structure of the protective cap. It can be seen that the position indicating ring 501 arranged at the nearest end of the protective cap 5 has the largest outer diameter of the entire protective cap 5. Figure 5 , the operator usually hopes to know to what extent the protective cover 401 is pulled toward the proximal end that the shrink ring 402 is in a state of being completely separated from the protective cap 5. The protective cap 5 is made of a material that can produce a certain elastic deformation, such as polypropylene, polyethylene, and polystyrene. When the minimum outer diameter of the indicating ring 501 is greater than the maximum inner diameter of the distal stop ring surface 402a, when the distal stop ring surface 402a just contacts the indicating ring 501, it is bound to be resisted by the indicating ring 501. At this time, if the protective cover 401 is pulled hard again, the indicating ring 501 can be squeezed so that the distal stop ring surface 402a passes over the indicating ring 501, and this force application process can give the operator a message, that is, at this time, the shrink ring 402 is completely separated from the area where the protective cap 5 is located, and pulling off the protective cap 5 at this time will not cause any impact on the protective cover 401.

[0081] Embodiment 3 In this embodiment, the structure of all protective prefilled syringes in Embodiment 1 or Embodiment 2 is included, and in addition: The needle cover unit 4 further includes a cantilever 403 and a stop hook 404 .

[0082] refer to Figure 8 , shows a schematic diagram of the structure of the needle cover unit. It can be seen that the needle cover unit 4 also includes a cantilever 403 arranged at the proximal end of the protective cover 401, and a stop hook 404 arranged at the proximal end of the protective cover 401. The stop hook 404 is provided with a mounting groove, and the cantilever 403 is located in the mounting groove.

[0083] refer to Fig.13 , showing a schematic diagram of the needle cover unit being engaged with the reinforced syringe disc after the protective cap is removed. It can be seen that when the protective cover 401 is engaged with the convex ridge member 201, the proximal end surface of the cantilever 403 abuts against the distal stop surface 201a, and the distal end surface of the stop hook 404 hooks on the proximal stop surface 201b, one in front and one behind to achieve the protective cover 401 being engaged with the convex ridge member 201.

[0084] In addition, when the protective cap 5 is sleeved on the reinforced syringe disc, the protective cap 5 just pushes the cantilever 403 outward, so that the proximal surface of the cantilever 403 no longer rests on the distal stop surface 201a. At this time, the protective cover 401 can be pulled proximally. After the protective cap 5 is removed, the protective cover 401 is pulled distally, which will make the proximal surface of the cantilever 403 rest on the distal stop surface 201a, and the distal surface of the stop hook 404 hooks on the proximal stop surface 201b, that is, the protective cover 401 is stuck on the convex ridge 201.

[0085] In summary, in this embodiment, the method for using the protective prefilled syringe is: S01. Pull the protective cover 401 proximally until the shrink ring 402 abuts against the convex ridge member 201; S02. Remove the protective cap 5 and complete the injection; S03. Pull the protective cover 401 to the distal end, so that the cantilever 403 falls down and cooperates with the stop hook 404 to get stuck on the ridge piece 201, thereby completely covering the needle.

[0086] Embodiment 4 In this embodiment, the structure of all protective prefilled syringes in Embodiment 1, Embodiment 2 or Embodiment 3 is included, and in addition: The convex ridge member 201 is further provided with a needle seat 203 , and the needle seat 203 is further provided with an expansion step 204 .

[0087] Reference again Fig.11It can be seen that the needle seat 203 has a hollow structure, in which needle mounting protrusions extending inward are arranged, and the needle can be installed between the needle mounting protrusions, and the needle can be inserted along the hollow structure of the needle seat 203 until it is connected with the syringe 1. The outer surface of the needle seat 203 is provided with expansion steps 204 with the same number as the spacing steps 202. The function of the expansion steps is to press the inner side of the protective cap 5 outward when the protective cap 5 is sleeved on the needle seat 203, so that the protective cap 5 can be more firmly installed on the needle seat 203 even in the presence of the spacing steps 202.

[0088] Test Example 1 - Test of the tilt effect of the protective cover In this test example, the prefilled syringe described in Example 1 of the present application was selected as Sample 1, and the prefilled syringe described in Example 1 with publication number CN117180556B was used as a comparison, which was recorded as Sample 2. The protective covers of both were made of polypropylene, and the molecular weight, thickness and other specifications were consistent.

[0089] During the test, a force of 10N was applied to the radial direction of the shield, and the shield was tilted as much as possible while avoiding the influence of the deformation of the shield itself. The tilt angle of the shield in samples 1 and 2 was recorded, and each sample was tested 5 times. The most results were selected as the final result to eliminate the influence of the deformation of the shield due to different angles. The tilt angle of the shield refers to the acute angle formed by the proximal end face of the cantilever 403 and the distal end face of the convex ridge 201. The results are shown in Table 1: Table 1. Test results of the inclination of the protective cover of samples 1 and 2 It can be seen from the data in Table 1 that after the retaining rib 202b is added, the tilt degree of the sample of the protective cover is reduced from 5.4° to 2.3° under the action of external force, so that the risk of radial separation is smaller.

[0090] Test Example 2: Radial Separation Effect Test of Protective Cover In this test example, the prefilled syringe described in Example 1 of the present application was selected as Sample 3, and the prefilled syringe described in Example 1 with publication number CN117180556B was used as a comparison, which was recorded as Sample 4. The protective covers of both were made of polypropylene, and the molecular weight, thickness and other specifications were consistent.

[0091] During the test, a force of 50N was applied to the radial direction of the protective cover to simulate the phenomenon of accidental radial contact of the protective cover during daily use. The number of times samples 3 and 4 fell off was recorded. Each sample was tested 100 times, and the total number of times each sample fell off was recorded to eliminate the influence of accidental falling off. The results are shown in Table 2: Table 2. Test results of radial separation effect of protective cover of samples 3 and 4 From the data in Table 2, it can be seen that sample 3 did not fall off, while sample 4 fell off 5 times out of 100 tests, indicating that after adding the retaining rib 202b, the risk of the protective cover on the prefilled syringe falling off can be significantly reduced.

[0092] In addition, the same or similar element symbols are used to refer to the same or similar parts or steps in the drawings and descriptions as much as possible. The drawings are presented in simplified form and are not drawn to exact scale. For convenience and clarity only, directional terms such as top, bottom, left, right, upward, above, above, below, below, behind, and in front may be used with respect to the drawings. These and similar directional terms should not be construed as limiting the scope of the present disclosure in any way.

Claims

1. A reinforced syringe disc, for mounting the needle and connected to the syringe (1) to allow liquid to flow, comprising: A convex rib member (201), wherein the distal end side of the convex rib member (201) has a flat surface; A spacing step (202) is provided on the distal side surface of the convex ridge member (201) and is used to lift up the protective cap (5); The invention is characterized in that the spacing step (202) comprises a spacing rib (202a) and a stop rib (202b); the spacing rib (202a) is arranged along the diameter of the distal side surface of the convex ridge member (201), and the stop rib (202b) is arranged on both sides of the spacing rib (202a); the spacing rib (202a) and the stop rib (202b) have the same height.

2. A prefilled syringe comprising the reinforced barrel disc according to claim 1, characterized in that: Also includes: A syringe (1), used for packaging liquid; A needle, mounted on the needle seat (203) of the convex ridge member (201) and connected to the syringe (1) to allow the liquid to flow; A needle sleeve unit (4) at least partially sleeved on the needle barrel (1) and at least partially sleeved on the ridge member (201); A protective cap (5) at least partially sleeved on the needle seat (203) to completely sleeve the needle; The spacing step (202) ensures that the protective cap (5) does not completely fit tightly against the distal surface of the convex ridge (201) when the protective cap (5) is sleeved on the needle, and when the needle sleeve unit (4) is pulled upward along the proximal end to completely expose the protective cap (5), there is no overlapping portion between the protective cap (5) and the needle sleeve unit (4).

3. The prefilled syringe according to claim 2, characterized in that: The needle cover unit (4) comprises a protective cover (401) and a shrink ring (402) arranged at the distal end of the protective cover (401) and used for engaging the convex ridge piece (201).

4. The prefilled syringe according to claim 3, characterized in that: The convex ridge member (201) comprises a distal stop surface (201a), a proximal stop surface (201b), and a side stop surface (201c) used for connecting the distal stop surface (201a) and the proximal stop surface (201b).

5. The prefilled syringe according to claim 4, characterized in that: The spacing step (202) is arranged on the distal end stop surface (201a).

6. The prefilled syringe according to claim 4, characterized in that: The contraction ring (402) comprises a distal stop ring surface (402a) and a proximal stop ring surface (402b); the maximum diameter of the distal stop ring surface (402a) is smaller than the minimum diameter of the proximal stop ring surface (402b).

7. The prefilled syringe according to claim 6, characterized in that: The minimum diameter of the distal stop ring surface (402a) is greater than the maximum diameter of the distal stop surface (201a).

8. The prefilled syringe according to claim 6, characterized in that: The maximum diameter of the distal stop ring surface (402a) is smaller than the minimum diameter of the proximal stop surface (201b).

9. The prefilled syringe according to claim 6, characterized in that: A positioning ring (501) is provided at the proximal end of the protective cap (5), and the minimum outer diameter of the positioning ring (501) is greater than the maximum inner diameter of the distal stop ring surface (402a).

10. The prefilled syringe according to claim 4, characterized in that: The needle cover unit (4) further comprises a cantilever (403) arranged at the proximal end of the protective cover (401) and used to lift up the distal stop surface (201a), and a stop hook (404) arranged at the proximal end of the protective cover (401) and used to engage with the proximal stop surface (201b).

11. The prefilled syringe according to claim 2, characterized in that: It also includes an expansion step (204) disposed on the needle seat (203) and used for mounting the protective cap (5).

12. The prefilled syringe according to claim 11, characterized in that: The expansion step (204) is connected to the spacing step (202).

13. The prefilled syringe according to claim 2, characterized in that: The number of the spacing steps (202) is two, three, or four, and the angles between the spacing steps (202) are equal.

14. The prefilled syringe according to claim 2, characterized in that: The distal end of the syringe (1) is provided with a guiding inclined surface (101).

15. The prefilled syringe according to claim 2, characterized in that: The material of the protective cap (5) includes one or more combinations of polypropylene, polyethylene, and polystyrene.

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