Ribbed barrel disc, pre-filled syringe

Abstract

The present application belongs to the technical field of medical devices, and particularly relates to a reinforced needle cylinder disc and a pre-filled syringe. The reinforced needle cylinder disc is used for mounting a needle and communicating with a needle cylinder to allow liquid to flow, and comprises a disc, a distal end side of the disc having a flat surface; a spacing step arranged on the distal end side of the disc and used for lifting a cap; the spacing step comprising a spacing rib and a stop rib; the spacing rib being arranged along the diameter of the distal end side of the disc, and the stop rib being arranged on both sides of the spacing rib. The present application has the advantages that the spacing rib can separate the position of the protective cover and the cap, so as to avoid accidental triggering of the sliding of the protective cover when the cap is pulled off, thereby reducing the risk of misoperation and ensuring that the operator can safely pull off the cap without interfering with the position of the protective cover; and the arrangement of the stop rib can reduce the inclination angle of the protective cover when the protective cover produces a lateral inclination phenomenon or a lateral inclination trend, so as to avoid the phenomenon of radial falling off.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and particularly relates to reinforced syringe discs and pre-filled syringes. Background Technology

[0002] Pre-filled syringes are injection devices used in the medical field, integrating the functions of a syringe and a drug container. These syringes are pre-filled with medication during the manufacturing process, and the purity and efficacy of the medication are protected through sealing. The pre-filled design makes it more convenient and faster for healthcare professionals to use, reducing the time and steps required for medication preparation. Furthermore, because pre-filled syringes are for single use, the risk of cross-infection is avoided, improving patient safety. In addition, the strict sealing measures implemented during the manufacturing process effectively protect the purity and stability of the medication, extending its shelf life.

[0003] The main components of a pre-filled syringe include the syringe body, drug container, plunger, needle, and protective cap. The syringe body is typically made of transparent material, allowing healthcare professionals to clearly observe the dosage and consistency of the medication. The drug container is generally made of glass or plastic, with a capacity varying according to need, allowing for different dosages of medication. The plunger propels the medication into the needle for injection. The needle is used to administer the medication to the patient. The protective cap protects the needle before and after use for hygiene.

[0004] However, existing pre-filled syringes are often discarded carelessly after use, leaving the needle exposed, which is very dangerous. To solve the problem of exposed needles after syringes are discarded, operators often put the removed protective cap back on. However, this has many drawbacks. On the one hand, the protective cap is custom-made for the needle and has a small opening, making it difficult to reinsert after being removed. On the other hand, the process of reinstalling the cap can easily cause the needle to prick the operator's hand.

[0005] To address the aforementioned issues, the inventor previously applied for a related invention patent, specifically CN117180556B, which discloses a protective pre-filled syringe. The protective cover's axial position can be adjusted via a push-pull motion to expose the needle for injection and to cover and discard the needle after injection, preventing needlestick injuries. Specifically, this application incorporates a stepped spacer on the reinforced syringe disc to lift the needle sheath. This stepr ensures that the needle sheath is not completely pressed against the distal surface of the protruding ridge when it is fitted onto the needle. This prevents overlap between the needle sheath and the protective cover unit when the protective cover is pulled up proximally to fully expose the needle sheath. In other words, pulling the needle sheath axially out will not move the protective cover unit, thus avoiding accidental movement of the protective cover unit when removing the needle sheath.

[0006] However, it was found in actual use that the above-mentioned syringes, as shown in the attached document,Figure 16 , 17 The presence of the step gap can cause the protective cover to tilt during installation. This could lead to the protective cover coming loose from the engagement with the protruding part, thus exposing the injection needle and losing its original function of preventing needle stick injuries.

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

[0008] The purpose of this invention is to provide a reinforced syringe disc for pre-filling syringes.

[0009] The technical solution adopted by the present invention to solve the above problems is: a reinforced syringe disc, used to install needles and connected to the syringe to allow liquid flow, comprising:

[0010] A disk, the distal side of which has a plane;

[0011] Interval steps are set on the far side of the disc and are used to support the protective cap;

[0012] The spacer step includes spacer ribs and stop ribs; the spacer ribs are arranged along the diameter of the distal side of the disc, and the stop ribs are arranged on both sides of the spacer ribs.

[0013] In this application, based on the existing cross-shaped protrusions on the distal side of the disc in CN117180556B, the original interval steps are used as interval ribs. Then, stop ribs are added on both sides of the interval ribs. After the protective cover covers the injection needle again at the distal end, the cantilever will form at least three contact points with the interval ribs and the stop ribs on both sides in the fixed position. This avoids single-point support at the contact point between the cantilever and the interval ribs when the protective cap is bent radially, greatly reducing 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.

[0014] It is important to note that "radial bending" refers to the protective shield bending perpendicular to the axis of the syringe. Specific reasons include:

[0015] 1. Tolerances during the manufacturing process result in a certain gap remaining between the protective cover and the disc after they are engaged;

[0016] 2. The protective cover itself is made of a certain degree of elasticity, and can be bent in the direction perpendicular to the axis of the syringe in the event of human error.

[0017] A further preferred technical solution is that the spacer bars and the stop bars have the same height.

[0018] The purpose of setting the spacer bars and the stop bars to have the same height is to achieve the effect of three-point support for the protective cover.

[0019] "Consistent height" generally refers to multiple elements within a structure or component, such as spacers and stoppers, having the same vertical dimension or height. This means that these elements are equidistant from a reference plane, such as the far end of a disk, to their highest point. While their heights may not be perfectly identical mathematically, and slight manufacturing tolerances may exist, these differences in height do not affect the overall performance or function. Therefore, even with minor height variations, as long as the functionality is guaranteed, it can still be considered "consistent height."

[0020] A pre-filled syringe, comprising the aforementioned reinforced syringe disc, characterized in that it further comprises:

[0021] Syringes are used to encapsulate liquids;

[0022] The needle is mounted on the needle seat of the protruding part and communicates with the syringe to allow liquid flow;

[0023] The needle sleeve unit is at least partially fitted onto the syringe and at least partially fitted onto the protruding ridge;

[0024] The cap is at least partially fitted onto the needle hub to fully engage the needle;

[0025] The stepped gaps prevent the cap from being fully fitted onto the distal end of the protruding part when it is attached to the needle. When the needle sleeve unit is pulled up along the proximal end to fully expose the cap, there is no overlap between the cap and the needle sleeve unit.

[0026] A further preferred technical solution is that the needle sleeve unit includes a protective cover and a shrink ring disposed at the far end of the protective cover for engaging the protruding rib.

[0027] A further preferred technical solution is that the protruding rib 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.

[0028] A further preferred technical solution is that the interval steps are set on the far end stop surface.

[0029] A further preferred technical solution is that the contraction 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.

[0030] A further preferred technical solution is that the minimum diameter of the distal stop annular surface is greater than the maximum diameter of the distal stop surface.

[0031] A further preferred technical solution is that the maximum diameter of the distal stop annulus is smaller than the minimum diameter of the proximal stop annulus.

[0032] A further preferred technical solution is that: a position indicator ring is provided at the proximal end of the cap, and the minimum outer diameter of the position indicator ring is greater than the maximum inner diameter of the distal stop ring surface.

[0033] A further preferred technical solution is that the needle sleeve unit further includes a cantilever disposed at the proximal end of the protective cover and used to lift the distal stop surface, and a stop hook disposed at the proximal end of the protective cover and used to engage the proximal stop surface.

[0034] A further preferred technical solution includes an expansion step disposed on the needle holder for installing the protective cap.

[0035] A further preferred technical solution is that the expansion step is connected to the interval step.

[0036] A further preferred technical solution is that two, three, or four interval steps are set, and the angle between each interval step is equal.

[0037] A further preferred technical solution is that a guide slope is provided at the distal end of the syringe.

[0038] A further preferred technical solution is that the cap material includes one or more combinations of polypropylene, polyethylene, and polystyrene.

[0039] In summary, the present invention has the following advantages:

[0040] 1. Preventing accidental operation: The spacer ribs separate the protective cover from the cap, preventing the protective cover from sliding accidentally when the cap is removed. This reduces the risk of accidental operation and ensures that operators can safely remove the cap without interfering with the position of the protective cover.

[0041] 2. Prevent the protective cover from falling off: The anti-tilting ribs reduce the tilt angle of the protective cover when it tilts or tends to tilt, thus preventing radial detachment.

[0042] 3. Improved stability: By separating the protective shield from the cap, the shield remains stable during cap removal. This prevents the shield from accidentally sliding or falling off, reducing the false triggering rate and improving overall safety.

[0043] 4. Convenient and Quick: The separate design of the protective cover and cap makes operation more convenient and quick. Operators can focus on removing the cap without having to pay extra attention to the position of the protective cover. This saves time and effort and improves operational efficiency.

[0044] 5. Simplified Design and Manufacturing: Separating the protective shield from the cap simplifies the overall design and manufacturing process. There's no need to consider the coupling and coordination between the cap and shield, reducing manufacturing costs and complexity.

[0045] In summary, completely separating the protective shield from the cap prevents accidental operation, improves safety, facilitates convenience, and simplifies the design and manufacturing process. This design further enhances the safety and ease of use of pre-filled syringes. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a protective pre-filled syringe.

[0047] Figure 2 for Figure 1 A schematic diagram of an explosion involving a pre-filled, protective injector.

[0048] Figure 3 for Figure 1 A schematic diagram of the cross-section of a pre-filled, protective injector along line AA'.

[0049] Figure 4 for Figure 3 A schematic diagram of the middle needle sleeve unit sliding towards the proximal end.

[0050] Figure 5 for Figure 4 A magnified view of region C in the middle.

[0051] Figure 6 This is a schematic diagram of the structure of the syringe and the reinforced syringe disc.

[0052] Figure 7 This is a cross-sectional structural diagram of the syringe and the reinforced syringe disc.

[0053] Figure 8 This is a schematic diagram of the needle sleeve unit.

[0054] Figure 9 This is a cross-sectional structural diagram of the needle sleeve unit.

[0055] Figure 10 This is a structural diagram of the protective cap.

[0056] Figure 11 for Figure 7 A magnified view of region B in the middle.

[0057] Figure 12 for Figure 11 A schematic diagram of the front view of the cross-section of the reinforced syringe disc.

[0058] Figure 13 This is a diagram showing the needle sheath unit locking onto the reinforced syringe disc after the cap is removed.

[0059] Figure 14 This is a schematic diagram showing the protective cover in a vertical position when the protruding part has spacer ribs and stop ribs.

[0060] Figure 15 This is a schematic diagram showing the protective cover in an inclined state when the protruding part has spacer ribs and stop ribs.

[0061] Figure 16 This is a schematic diagram showing the protective cover in a vertical position when only spacer ribs are provided on the protruding rib.

[0062] Figure 17 This is a schematic diagram showing the protective cover in an inclined state when only spacer ribs are provided on the protruding rib.

[0063] In the attached diagram, the components represented by each number are as follows: syringe 1, needle, needle sheath unit 4, protective cap 5, guide ramp 101, protruding rib 201, spacer step 202, needle seat 203, expansion step 204, protective cover 401, contraction ring 402, cantilever 403, stop hook 404, indicator ring 501, distal stop surface 201a, proximal stop surface 201b, lateral stop surface 201c, spacer rib 202a, stop rib 202b, distal stop ring surface 402a, proximal stop ring surface 402b. Detailed Implementation

[0064] definition:

[0065] 1. Distal end: refers to the end of the syringe and its components that are normally mounted on the syringe, facing the needle.

[0066] 2. Proximal end: refers to the end of the syringe and its components that are normally mounted on the syringe, away from the needle.

[0067] 3. Axis: refers to the line connecting the centroids of all cross sections of a component with symmetrical cross sections.

[0068] 4. Open: refers to the ability to expose the needle or cap during operation.

[0069] 5. Closure: This refers to the ability to cover the needle or cap during operation.

[0070] 6. Socketing: refers to the act of mounting 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.

[0071] 7. Setting: refers to any method used to join two parts together, such as bonding, snapping, welding, screwing, or placing.

[0072] 8. Lifting: This refers to component one applying force to component two, causing component two to move in the opposite direction to component one.

[0073] 9. Minimum / Maximum Diameter: For components with a distinct axis, a cross-section is taken perpendicular to the axis. This cross-section is approximately circular or polygonal. The narrowest part of this cross-section is the minimum diameter of the component, and the corresponding widest part is the maximum diameter. The minimum diameter of any given cross-section should not exceed its maximum diameter.

[0074] The present invention will be further described in detail below with reference to the accompanying drawings.

[0075] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0076] Example:

[0077] In this embodiment, a reinforced syringe disc, used to mount a needle and communicated with syringe 1 to allow liquid flow, includes:

[0078] The protruding rib 201 has a flat surface on its distal end;

[0079] The spaced step 202 is provided on the far side of the protruding rib 201 and is used to lift the protective cap 5;

[0080] The spacer step 202 includes a spacer rib 202a and a stop rib 202b; the spacer rib 202a is provided along the diameter of the distal side of the protruding rib 201, and the stop rib 202b is provided on both sides of the spacer rib 202a, and the spacer rib 202a and the stop rib 202b have the same height.

[0081] refer to Figure 6 The stop rib 202b is positioned parallel to one of the spacer ribs 202a and on both sides thereof. Viewed from a top angle, the distal end face of the protruding rib 201 appears as follows: Figure 6 As shown, it has three vertically distributed ribs and one horizontally distributed rib, with the three vertically distributed ribs arranged in a basically parallel manner.

[0082] It should be noted that the ends of both the spacer 202a and the stop 202b are located within the plane of the distal side of the protruding rib 201, and do not extend beyond its boundaries. Specifically, "located within the plane" means that, from a top-view perspective, the ends of both the spacer 202a and the stop rib 202b do not extend beyond the circular projection formed by the protruding rib 201.

[0083] The pre-filled syringe, comprising a reinforced syringe disc, also includes:

[0084] Syringe 1, needle, needle sheath unit 4, protective cap 5, wherein:

[0085] The needle sleeve unit 4 includes a protective cover 401 and a shrink ring 402.

[0086] refer to Figure 1 The diagram shows a schematic of a protective pre-filled syringe. The syringe barrel 1 is visible, used to encapsulate the liquid; the needle sleeve unit 4 is at least partially fitted onto the syringe barrel 1. The diagram shows the protective pre-filled syringe in its unused state, with the needle sleeve unit 4 fitted onto the syringe barrel 1 and completely covering the protective cap 5. The needle sleeve unit 4 is coaxially arranged with the syringe barrel 1 and can slide proximally along the syringe barrel 1.

[0087] refer to Figure 2 It showed Figure 1 An exploded view of a pre-filled syringe with a protective casing. A reinforced syringe disc is visible, mounted at the distal end of syringe 1; a needle is mounted on the reinforced syringe disc and communicates with syringe 1 to allow liquid flow; a cap 5 is used to attach the needle. For ease of illustration of other structures, the needle is not shown in the diagram, but its position on the reinforced syringe disc can be inferred from the general structure of a syringe. Syringe 1, the reinforced syringe disc, the needle sheath unit 4, and the cap 5 all share a common axis.

[0088] refer to Figure 3 It showed Figure 1 A schematic diagram of a pre-filled syringe with central protection along line AA'. The syringe barrel 1 has a cylindrical hollow structure for encapsulating liquid. The syringe barrel 1 also has an injection piston, similar to those used in conventional syringes. Pushing the injection piston forces the liquid into a reinforced syringe disc. The reinforced syringe disc has a channel at its axis that communicates with the cylindrical cavity inside the syringe barrel 1. This channel also communicates with the hollow structure inside the needle, allowing the liquid entering the reinforced syringe disc to be injected through the needle. The needle sleeve unit 4 is visible, at least partially fitted onto the syringe barrel 1 and at least partially fitted onto the reinforced syringe disc. The protective cap 5 is also at least partially fitted onto the reinforced syringe disc to completely cover the needle.

[0089] refer to Figure 4 It showed Figure 3 A schematic diagram of the middle needle sheath unit sliding proximally. This step is to expose the cap 5 so that the cap can be removed distally in the next step, exposing the needle for injection.

[0090] refer to Figure 6 The diagram shows a schematic of the syringe and the reinforced syringe disc. The reinforced syringe disc includes a protruding rib 201 and spaced steps 202 on the distal surface of the protruding rib 201. The diagram shows four spaced steps 202 on the distal surface of the protruding rib 201, with each spaced step 202 at a 90° angle to the others.

[0091] refer to Figure 8 The diagram shows the structure of the needle sleeve unit. The needle sleeve unit 4 includes a protective cover 401 and a contraction ring 402 located at the distal end of the protective cover 401. The contraction ring 402 gradually contracts from the proximal end to the distal end, forming a distal stop annular surface 402a at the distal end of the contraction ring 402. Conversely, a proximal stop annular surface 402b is formed where the contraction ring 402 begins to contract.

[0092] refer to Figure 11 It showed Figure 7 Enlarged schematic diagram of region B. It can be seen that the protruding rib 201 gradually expands outward from the distal end to the proximal end, forming a frustum structure. The frustum has a smaller base surface and a larger base surface. The smaller base surface is the distal stop surface 201a, and the larger base surface is the proximal stop surface 201b. The arc-shaped side surface of the frustum constitutes the side stop surface 201c.

[0093] refer to Figure 5 It showed Figure 4 An enlarged schematic diagram of region C. It can be seen that when the protective cover 401 is pulled proximally until the contraction ring 402 contacts the protruding ridge 201, because the minimum diameter of the distal stop annular surface 402a is greater than the maximum diameter of the distal stop surface 201a, the distal stop annular surface 402a can pass over the distal stop surface 201a; and the maximum diameter of the distal stop annular surface 402a is smaller than the minimum diameter of the proximal stop annular surface 402b. Therefore, the distal stop annular surface 402a cannot pass over the proximal stop annular surface 402b, and ultimately, the distal stop annular surface 402a stops and rests against the side stop surface 201c. Furthermore, due to the presence of the spacer step 202, the proximal end of the protective cap 5 does not rest against the distal stop surface 201a, so the contraction ring 402 completely separates from the protective cap 5, meaning that the process of removing the protective cap 5 does not affect the protective cover 401 at all. Furthermore, since the distal stop ring 402a cannot cross the proximal stop ring 402b, no matter how the operator pulls the protective cover 401, the protective cover 401 will not be pulled directly and 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.

[0094] refer to Figure 14 , 15 When the protruding rib 201 is supported only by a single point of the spacer rib 202a and the protective cap is bent perpendicular to the axial direction, the cantilever 403 sways left and right. The cantilever 403 and the stop hook 404 will disengage from the protruding rib 201 as the swaying or bending force increases, causing the protective function of the protective cover 401 to fail.

[0095] refer to Figure 16 , 17When the protruding rib 201 is provided with a stop rib 202b in addition to the spacer rib 202a, and the entire circumference of the protruding rib 201 is provided with rib support, when the protective cover 401 is bent perpendicular to the axial direction, the left and right sway of the protective cover 401 can be effectively suppressed, so that the cantilever 403, the stop hook 404 and the protruding rib 201 fit better, and the protective cover 401 has better anti-detachment performance.

[0096] In another embodiment, the stop rib 202b may not be parallel to the spacer rib 202a. It may be positioned between the two spacer ribs 202a along their diagonal or at any angle, as long as it can ensure the protective cover 401 is detached.

[0097] In another embodiment, multiple stop ribs 202b are provided on the spacer ribs 202a, such as two on one side for a total of four, or three on one side for a total of six, as long as they can ensure the protective cover 401 is not detached.

[0098] In another embodiment, the width of the stop rib 202b can be set arbitrarily, and can be 0.5 times the width of the spacer rib 202a, or 1.5 times the width, or 2 times the width, as long as it can ensure the anti-detachment effect of the protective cover 401.

[0099] Example 2

[0100] In this embodiment, the structure of the protective pre-filled syringe is basically the same as that in Embodiment 1, except that the minimum outer diameter of the protective cap 5 is greater than the maximum inner diameter of the distal stop ring 402a.

[0101] refer to Figure 10 The diagram shows the structure of the protective cap. It is evident that the indicator ring 501, located at the closest end of the protective cap 5, has the largest outer diameter of the entire protective cap 5. (Refer to...) Figure 5 Operators typically want to know to what extent the protective cover 401 is pulled proximally until the contraction ring 402 is completely separated from the cap 5. The cap 5 is made of a material capable of elastic deformation, such as polypropylene, polyethylene, or polystyrene. When the minimum outer diameter of the position ring 501 is greater than the maximum inner diameter of the distal stop ring surface 402a, the distal stop ring surface 402a will inevitably be blocked by the position ring 501 when it just contacts it. At this point, pulling the protective cover 401 further will compress the position ring 501, causing the distal stop ring surface 402a to pass over it. This force application process provides the operator with the information that the contraction ring 402 is completely detached from the area where the cap 5 is located, and removing the cap 5 at this point will not affect the protective cover 401.

[0102] Example 3

[0103] In this embodiment, the structure of all the protective pre-filled syringes in Embodiment 1 or Embodiment 2 is included, in addition:

[0104] The needle sleeve unit 4 also includes a cantilever 403 and a stop hook 404.

[0105] refer to Figure 8 The diagram shows the structure of the needle sleeve unit. It can be seen that the needle sleeve unit 4 also includes a cantilever 403 located near the protective cover 401, and a stop hook 404 located near the protective cover 401. The stop hook 404 has a mounting groove, and the cantilever 403 is located within the mounting groove.

[0106] refer to Figure 13 The diagram shows the needle sheath unit locking onto the reinforced syringe disc after the protective cap is removed. It can be seen that when the protective cover 401 is engaged with the protruding rib 201, the proximal end face of the cantilever 403 abuts against the distal stop surface 201a, and the distal end face of the stop hook 404 hooks onto the proximal stop surface 201b, working in tandem to engage the protective cover 401 with the protruding rib 201.

[0107] Furthermore, when the protective cap 5 is fitted onto the reinforced syringe disc, the protective cap 5 pushes the cantilever 403 outward, causing the proximal end face of the cantilever 403 to abut against the distal stop face 201a. At this time, the protective cover 401 can be pulled proximally. When the protective cap 5 is removed, the protective cover 401 is pulled distally, causing the proximal end face of the cantilever 403 to abut against the distal stop face 201a, and the distal end face of the stop hook 404 hooks onto the proximal stop face 201b, that is, the protective cover 401 is stuck on the protruding rib 201.

[0108] In summary, in this embodiment, the method of using the protective pre-filled syringe is as follows:

[0109] S01. Pull the protective cover 401 towards the proximal end until the contraction ring 402 abuts against the protruding rib 201;

[0110] S02. Remove the protective cap 5 and complete the injection;

[0111] S03. Pull the protective cover 401 to the far end, so that the cantilever 403 falls down and engages with the stop hook 404 to lock onto the protruding part 201, thus completing the complete coverage of the needle.

[0112] Example 4

[0113] In this embodiment, the structure of all the protective pre-filled syringes described in Embodiment 1, Embodiment 2, or Embodiment 3 is included. Furthermore:

[0114] The protruding rib 201 is also provided with a needle seat 203, and the needle seat 203 is also provided with an expansion step 204.

[0115] Refer again Figure 11 As can be seen, the needle holder 203 has a hollow structure, within which are inwardly extending needle mounting protrusions. The needle can be installed between these protrusions and can be inserted along the hollow structure of the needle holder 203 until it connects with the syringe 1. On the outer surface of the needle holder 203, there are expansion steps 204, the same number as the spacer steps 202. The function of these expansion steps is to press the inner side of the protective cap 5 outward when it is fitted onto the needle holder 203, ensuring that the protective cap 5 is more securely installed on the needle holder 203 even with the spacer steps 202 present.

[0116] Test Example 1 – Tilting Effect Test of Protective Shield

[0117] In this test example, the pre-filled syringe described in Example 1 of this application was selected as Sample 1, and the pre-filled syringe described in Example 1 of Publication No. CN117180556B was used as a comparison and was designated as Sample 2. Both of them have protective covers made of polypropylene and have the same molecular weight, thickness and other specifications.

[0118] During testing, a 10N force was applied radially to the protective cover, tilting it as much as possible while avoiding the effects of deformation of the cover itself. The tilt angles of the protective covers in samples 1 and 2 were recorded. Each sample was tested 5 times, and the result with the most frequent occurrences was selected as the final result to eliminate the influence of deformation caused by different angles. The tilt angle of the protective cover refers to the acute angle formed by the proximal end face of the cantilever 403 and the distal end face of the protruding rib 201. The results are shown in Table 1.

[0119]

[0120] Table 1. Test results of the tilt angle of the protective covers for samples 1 and 2

[0121] As shown in Table 1, after adding the stop rib 202b, the tilt of the sample under external force was reduced from 5.4° to 2.3°, thus reducing the risk of radial detachment.

[0122] Test Example 2 – Radial Detachment Effect Test of Protective Shield

[0123] In this test example, the pre-filled syringe described in Example 1 of this application was selected as sample 3, and the pre-filled syringe described in Example 1 of publication number CN117180556B was used as a comparison and was designated as sample 4. Both of them have protective covers made of polypropylene and have the same molecular weight, thickness and other specifications.

[0124] During testing, a momentary force of 50N was applied radially to the protective cover to simulate accidental radial contact during daily use. The number of detachments for samples 3 and 4 was recorded. Each sample was tested 100 times, and the total number of detachments for each sample was recorded to eliminate the influence of accidental detachments. The results are shown in Table 2.

[0125]

[0126] Table 2. Test results of radial detachment effect of the protective covers of samples 3 and 4

[0127] As shown in Table 2, sample 3 did not detach, while sample 4 detached 5 times out of 100 tests. This indicates that the addition of the stop rib 202b significantly reduces the risk of the protective cover on the pre-filled syringe detaching.

[0128] Furthermore, the same or similar element symbols are used as far as possible in the accompanying drawings and description to refer to the same or similar parts or steps. The drawings are presented in a simplified form and are not drawn to scale. For convenience and clarity only, directional terms such as top, bottom, left, right, upward, above, above, below, behind, and front may be used to refer to the drawings. These and similar directional terms should not be construed as limiting the scope of this disclosure in any way.

Claims

1. A reinforced syringe disc for mounting a needle and communicating with the syringe (1) to allow liquid flow, comprising: A protruding ridge (201) has a flat surface on its distal end; A spacer step (202) is provided on the distal side of the protruding rib (201) and is used to lift the pin sleeve (5). The step (202) is characterized in that it includes a spacer rib (202a) and a stop rib (202b); the spacer rib (202a) is arranged along the diameter of the distal side of the protruding rib (201), and the stop rib (202b) is arranged on both sides of the spacer rib (202a); the spacer rib (202a) and the stop rib (202b) have the same height. The cantilever (403) forms at least three contact points with the spacer rib (202a) and the stop ribs (202b) on both sides to resist a force of no more than 10N applied radially to the protective cover unit (4).

2. A pre-filled syringe, comprising the reinforced syringe disc as described in claim 1, characterized in that, Also includes: Syringe (1), used to encapsulate liquid; The needle is mounted on the needle seat (203) of the protruding ridge (201) and communicates with the syringe (1) to allow the liquid to flow; The protective cover unit (4) is at least partially fitted onto the syringe (1) and at least partially fitted onto the protruding rib (201); The needle sleeve (5) is at least partially fitted onto the needle base (203) to fully fit the needle; The interval step (202) causes the needle sleeve (5) to not be completely pressed against the distal surface of the protruding ridge (201) when it is fitted onto the needle. When the protective cover unit (4) is pulled up along the proximal end so that the needle sleeve (5) is completely exposed, there is no overlap between the needle sleeve (5) and the protective cover unit (4).

3. The pre-filled syringe according to claim 2, characterized in that, The protective cover unit (4) includes a protective cover (401) and a shrink ring (402) disposed at the far end of the protective cover (401) for engaging the protruding rib (201).

4. The pre-filled syringe according to claim 3, characterized in that, The protruding rib (201) includes a distal stop surface (201a), a proximal stop surface (201b), and a lateral stop surface (201c) for connecting the distal stop surface (201a) and the proximal stop surface (201b).

5. The pre-filled syringe according to claim 4, characterized in that, The interval step (202) is disposed on the distal stop surface (201a).

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

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

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

9. The pre-filled syringe according to claim 6, characterized in that, The needle sheath (5) has a position indicator ring (501) at its proximal end, and the minimum outer diameter of the position indicator ring (501) is greater than the maximum inner diameter of the distal stop ring surface (402a).

10. The pre-filled syringe according to claim 4, characterized in that, The protective cover unit (4) further includes a cantilever (403) disposed at the proximal end of the protective cover (401) and used to lift the distal stop surface (201a), and a stop hook (404) disposed at the proximal end of the protective cover (401) and used to engage the proximal stop surface (201b).

11. The pre-filled 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 needle sleeve (5).

12. The pre-filled syringe according to claim 11, characterized in that, The expansion step (204) is connected to the spacer step (202).

13. The pre-filled syringe according to claim 2, characterized in that, The interval steps (202) are provided in two, three, or four, and the angles between each interval step (202) are equal.

14. The pre-filled syringe according to claim 2, characterized in that, The distal end of the syringe (1) is provided with a guide slope (101).

15. The pre-filled syringe according to claim 2, characterized in that, The needle sheath (5) is made of one or more of polypropylene, polyethylene, and polystyrene.

Images