NEEDLE STICK PREVENTION DEVICE

Abstract

NEEDLE STICK PREVENTION DEVICE. A needle stick prevention device comprises a syringe assembly (10), a force accumulating part, a fixing sleeve (20) and a limiting sleeve (30). The fixing sleeve (20) and the force accumulating part are positioned inside the limiting sleeve (30); the device has three states: in the first, the force accumulating part is stored forces, the fixing sleeve (20) is in a first position; in the second, the fixing sleeve (20) and the limiting sleeve (30) are released from the limitation, and the force accumulating part is released; in the third, the force accumulating part is completely released, the fixing sleeve (20) and the syringe assembly (10) move along the characteristic component of the guide (31) equipped with the limiting sleeve to a second position.Figure for abstract: Fig. 1.

Description

Title of the invention: NEEDLE STICK PREVENTION DEVICE TECHNICAL FIELD OF THE INVENTION

[0001] This specification relates to the technical field of injection devices, and in particular a needle stick prevention device.

[0002] PRIOR STATE OF THE ART

[0003] In a medical environment, the use of an injection device can lead to needlestick injuries. Needlestick injuries occur when, before or after using the injection device, the user unintentionally sticks the needle into their own body or that of another person, creating a risk of injury or cross-infection. To reduce the occurrence of needlestick injuries, the relevant authorities have tightened the regulation of medical devices, requiring the installation of special protective devices on disposable syringes. Traditional protective devices are complex, expensive and complicated to handle, which impairs work efficiency.

[0004] Therefore, it is necessary to provide a needle stick prevention device, which ensures that the needle can be safely covered or retracted during and after the injection process, thereby improving the safety and convenience of using the syringe.

[0005] DESCRIPTION OF THE INVENTION

[0006] One or more exemplary embodiments of the present specification provide a needlestick prevention device. Said device comprises a syringe assembly, a force accumulating piece, a fixing sleeve and a limiting sleeve; said fixing sleeve and said force accumulating piece are both positioned inside said limiting sleeve; one end of said force accumulating piece is fixedly connected to the fixing sleeve, while the other end is fixedly connected to said limiting sleeve; said syringe assembly comprises a pressure cap, a syringe barrel flange, a syringe barrel and a needle; said fixing sleeve comprises locking loops, flanged fixing loops, support tabs and limiting tabs, said flanged fixing loops are arranged to fix said syringe barrel flange;the limiting sleeve comprises a guide feature component, first limiting holes, second limiting holes and limiting hooks; said needle stick prevention device has a first state, a second state and a third state; in the first state, ; said force accumulating part is stored forces, said fixing sleeve is in a first position, when said fixing sleeve is in the first position, said limiting hooks and said locking loops mate, said support tabs are positioned respectively in said second limiting holes, and said limiting tabs are positioned at one end of said guide feature component near said second limiting holes; in the second state, said locking loops are rotated, and said locking loops are separated from said limiting hooks, said fixing sleeve and said limiting sleeve are released from limitation, and said force accumulating part is released;in the third state, said force accumulating part is completely released, said fixing sleeve and said syringe assembly move along the guide feature component to a second position, when said fixing sleeve is in the second position, said support tabs are respectively positioned in said first limiting holes, and said limiting tabs are respectively positioned at one end of said guide feature component near said first limiting holes. ;

[0007] DESCRIPTION OF THE ATTACHED DRAWINGS

[0008] The specification of the present invention will be explained in more detail by means of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These exemplary embodiments are not limiting, and in these exemplary embodiments, like numbers represent like structures, where:

[0009] [Fig.l] shows a schematic illustration of the exemplary general structure of a needlestick prevention device according to certain exemplary embodiments of the present specification;

[0010] [Fig.2] shows an exemplary cross-sectional structural diagram of a set of syringe according to certain embodiments of this specification;

[0011] [Fig.3] shows an exemplary schematic illustration of the structure three-dimensional of a fixing sleeve according to certain embodiments of the present specification;

[0012] [Fig.4] shows an exemplary sectional structural diagram of a sleeve of limitation according to certain embodiments of this specification;

[0013] [Fig.5] shows an exemplary diagram of the structure of a prevention device needle pricks in a first state according to certain embodiments of this specification;

[0014] [Fig.6] shows an exemplary diagram of the structure of a prevention device needle pricks in a second state according to certain embodiments of this specification;

[0015] [Fig.7] shows an exemplary diagram of the structure of a prevention device needle pricks in a third state according to certain embodiments of this specification;

[0016] [Fig-8] shows an exemplary sectional structural diagram of a sleeve of fixing according to certain embodiments of this specification;

[0017] [Fig.9] shows an exemplary sectional structural diagram of a cap of pressure according to certain embodiments of this specification;

[0018] [Fig. 10] shows an exemplary schematic illustration of the structure of a connecting strip according to certain exemplary embodiments of the present specification;

[0019] [Fig. 11] shows an exemplary sectional structural diagram of a force accumulation part in the force accumulation position according to certain exemplary embodiments of the present specification;

[0020] [Fig. 12] shows an exemplary sectional structural diagram of a force accumulation part in the released position according to certain exemplary embodiments of the present specification;

[0021] [Fig. 13] shows an exemplary sectional structural diagram when the force accumulating part according to certain exemplary embodiments of the present specification is a spring;

[0022] [Fig. 14] shows an exemplary schematic illustration of the local structure of a fixing sleeve according to certain exemplary embodiments of the present specification;

[0023] [Fig. 15] shows an exemplary schematic illustration of the local structure of a limiting sleeve according to certain exemplary embodiments of the present specification;

[0024] [Fig. 16] shows an exemplary schematic illustration of the local structure of the support tabs and the limiting tabs according to certain exemplary embodiments of the present specification;

[0025] [Fig. 17] shows an exemplary schematic illustration of the deployed structure of the inner wall of a limiting sleeve according to certain exemplary embodiments of the present specification;

[0026] [Fig. 18] shows an exemplary top view of the second limiting holes according to certain exemplary embodiments of the present specification;

[0027] [Fig. 19] shows an exemplary top view of characteristic guide components according to certain exemplary embodiments of the present specification;

[0028] [Fig.20] shows an exemplary schematic illustration of the structure of a adjustment locking section according to certain embodiments of this specification;

[0029] [Fig.21] shows another exemplary schematic illustration of the structure of a needle stick prevention device in the first state according to certain exemplary embodiments of this specification;

[0030] [Fig.22] shows an exemplary enlarged schematic illustration of a part local needle stick prevention device in the first state according to certain embodiments of this specification;

[0031] [Fig.23] shows an exemplary schematic illustration of the structure of a part needle stick prevention device release according to certain embodiments of this specification;

[0032] [Fig.24] presents an exemplary schematic illustration of the local structure of the needle stick prevention device according to certain embodiments of this specification;

[0033] [Fig.25] shows an exemplary sectional view of a structure of the fixed projections and of a fixed cavity according to certain embodiments of this specification;

[0034] [Fig.26] shows an exemplary three-dimensional view of a structure of the projections fixed and a fixed cavity according to certain embodiments of this specification;

[0035] [Fig.27] shows a schematic illustration of the exemplary position of the parts of adjustment according to certain embodiments of this specification;

[0036] [Fig.28] shows another schematic illustration of exemplary position of the parts adjustment according to certain embodiments of this specification;

[0037] [Fig.29] shows an exemplary schematic illustration of the structure of a part adjustment according to certain embodiments of this specification.

[0038] DESCRIPTION OF SPECIFIC EMBODIMENTS

[0039] Exemplary embodiments or embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the description below refers to the accompanying drawings, unless otherwise indicated, like numerals in different drawings represent the same or similar elements. The embodiments described in the exemplary embodiments below do not represent all embodiments consistent with the present application. Rather, they are only examples of devices and methods that are consistent with certain aspects of the present application.

[0040] The terms used in this application are solely for the purpose of describing specific examples and are not intended to limit the present application. The singular terms “a / an”, “said” and “this” used in this application are also intended to include the plural form, unless otherwise clearly indicated in the context.

[0041] It is to be understood that the words "first," "second," and the like used in this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not limit the quantity, but merely indicate that at least one element is present. Unless otherwise indicated, words such as "front," "back," "lower," and / or "upper" are used solely for clarification and are not limited to a single position or spatial orientation. Words such as "comprise" or "include" mean that the elements or objects preceding "comprise" or "include" cover the elements or objects listed after "comprise" or "include" and their equivalents, without excluding other elements or objects.

[0042] On disposable syringes, the integration of a specific protection device ensures that the needle is safely covered or retrieved after injection, thus reducing the risk of needlestick injuries. In existing scenarios, syringes equipped with a protection device are mainly of the “active” type, requiring the user to perform specific actions to activate the protection device. Thus, in current medical practices, after injection, medical personnel must manually place the needle in a protection device (such as a needle protection cap) to cover and retrieve it. This mode of manual needle retrieval is one of the main causes of needlestick accidents.In addition, existing protective devices are usually needle protection caps, the performance of which does not meet the highest safety requirements.

[0043] Accordingly, one or more exemplary embodiments of the present specification provide a needlestick prevention device, which enables rapid retrieval of the needle at various stages of the injection process through the release of a force accumulating part, as well as through the interaction between a securing sleeve and a limiting sleeve, in order to reduce the risk of needlestick injuries during and after injection. In addition, the device also secures and limits the syringe assembly via locking loops, limiting hooks and other components, in order to ensure the safety of the device in various states.

[0044] [Fig.l] shows a schematic illustration of the exemplary general structure of a needlestick prevention device according to certain exemplary embodiments of the present specification.

[0045] In some exemplary embodiments, as illustrated in [Fig.l], the needlestick prevention device 100 may comprise a syringe assembly 10, a force accumulating part, a securing sleeve 20, and a limiting sleeve 30. The securing sleeve 20 and the force accumulating part are all two positioned inside the limiting sleeve 30; one end of the force accumulating piece is fixedly connected to the fixing sleeve 20, while the other end is fixedly connected to the limiting sleeve 30. In some exemplary embodiments, the limiting sleeve 30 may be nested outside the fixing sleeve 20, the limiting sleeve 30 and the fixing sleeve 20 may be arranged coaxially, and the limiting sleeve 30 and the fixing sleeve 20 may slide relatively along the central axis.

[0046] The central axis refers to the common central axis of the limiting sleeve 30 and the securing sleeve 20. For example, as illustrated in [Fig.l], the central axis is the S axis. The syringe assembly 10 may be oriented along the S axis for injection, while the limiting sleeve 30 and the securing sleeve 20 may slide relatively along the S axis.

[0047] [Fig.2] shows an exemplary cross-sectional structural diagram of a syringe assembly according to certain exemplary embodiments of the present specification.

[0048] The syringe assembly 10 is a combination of components and / or structures used to perform the injection. In some exemplary embodiments, as illustrated in [Fig.l], the syringe assembly 10 is disposed coaxially with the attachment sleeve 20.

[0049] In some exemplary embodiments, as illustrated in [Fig. 2], the syringe assembly 10 comprises a pressure cap 11, a syringe body rim 14, a syringe body 15 and a needle 16.

[0050] The pressure cap 11 is a component for receiving a pushing force. By applying a pushing force to the pressure cap 11, the syringe assembly 10 can be pressed downward to perform the injection.

[0051] In some exemplary embodiments, the pressure cap 11 may be arranged in a predefined shape, such as circular or elliptical, with a rounded edge structure to avoid injury to the user. In some exemplary embodiments, the upper surface of the pressure cap 11 may be flat or curved to facilitate pushing. In some exemplary embodiments, the syringe assembly 10 also includes a rod 12. The rod 12 is a component for transmitting a pushing force. In some exemplary embodiments, the cross-sectional area of ​​the pressure cap 11 is greater than that of the rod 12, which means that the pressure cap 11 may be hat-shaped, thereby facilitating the application of the pushing force to the rod 12.

[0052] The syringe body flange 14 is a protruding structure used to secure the syringe body 15 to the securing sleeve 20. In some exemplary embodiments, the syringe body flange 14 is disposed at the top of the syringe body. syringe 15, and this syringe body flange 14 can keep the syringe body 15 relatively fixed relative to the fixing sleeve 20.

[0053] The syringe body 15 is adapted to store the injectable liquid, and this syringe body 15 may be configured as a hollow structure. The needle 16 is used to administer the injectable liquid, and this needle 16 may be disposed at the lower end of the syringe body 15, being fixedly connected thereto.

[0054] In some embodiments, the syringe assembly 10 comprises a plunger 13, this plunger 13 comprises a rubber stopper 131 and a pusher 132, the rubber stopper 131 and the pusher 132 being detachably attached, between the pusher 132 and the needle 16, there is a pre-filled and sealed medical solution. The pre-filled and sealed medical solution is previously filled and sealed in the syringe body.

[0055] In some examples, as illustrated in [Fig.2], the piston 13 is disposed at the lower end of the rod 12, the rubber stopper 131 being disposed at the upper end of the piston 13, and the pusher 132 being disposed at the lower end of the piston 13.

[0056] In some exemplary embodiments, the syringe assembly also includes a needle cap 17.

[0057] Upon assembly, the needle protection cap 17 is secured around the outside of the needle 16; prior to injection, the needle protection cap 17 is removed, and during injection, the rod 12 is manually pushed forward to effect injection of the pre-filled and sealed medical solution. In some exemplary embodiments, after injection, the needle protection cap 17 may be replaced around the needle 16 to protect it again, or may be discarded directly, and the needle 16 may penetrate into the limiting sleeve 30 as the securing sleeve 20 retracts.

[0058] In some exemplary embodiments, prior to injection, the needle protection cap may protect the needle, preventing outside germs from contaminating the pre-filled and sealed medical solution; while reducing the risk of injury from needle exposure.

[0059] The force accumulating part is a component used to provide a return force to the fixing sleeve 20. In some exemplary embodiments, the force accumulating element may be configured as an elastic structure, the compression or tension of this elastic structure may provide a return force to the fixing sleeve 20. For further details on the return spring, please refer to the explanations below.

[0060] [Fig.3] shows an exemplary schematic illustration of the structure three-dimensional view of a fixing sleeve according to certain embodiments of this specification.

[0061] The securing sleeve 20 is a component used to secure the syringe body 15. The securing sleeve 20 has a hollow structure and may be sleeved to the outside of the syringe body 15. In some exemplary embodiments, as illustrated in [Fig. 3], the securing sleeve 20 may include locking loops 21, flanged securing loops 22, support tabs 23, and limiting tabs 24.

[0062] The locking loops 21 are the components used to lock the fixing sleeve 20 onto the limiting sleeve 30. In some exemplary embodiments, as illustrated in [Fig. 3], the locking loops 21 may be disposed on the outer upper portion of the fixing sleeve 20. For further details on the locking loops 21, please refer to the relevant explanations in [Fig. 8].

[0063] The flanged attachment loops 22 are configured to secure the syringe barrel flange 14. The attachment sleeve 20 may be secured to the syringe barrel flange 14 via the flanged attachment loops 22. In some examples, as illustrated in [Fig. 3], the flanged attachment loops 22 may be disposed at the end of the attachment sleeve 20.

[0064] The support tabs 23 are the structures used to fix the fixing sleeve 20 to the limiting sleeve 30. In some exemplary embodiments, in their natural state, the support tabs 23 have outwardly open structures, as illustrated in [Fig. 3]; when subjected to an external force, the support tabs 23 may retract inward. In some exemplary embodiments, as illustrated in [Fig. 3], the support tabs 23 may be disposed at the lower end of the fixing sleeve 20.

[0065] The limiting tabs 24 have protruding structures disposed on the surface of the fixing sleeve 20, in order to limit the relative rotation between the fixing sleeve 20 and the limiting sleeve 30. In certain exemplary embodiments, the limiting tabs 24 are disposed on the lower surface of the fixing sleeve 20.

[0066] In certain exemplary embodiments, the limiting tabs 24 are spaced from the support tabs 23.

[0067] In some embodiments, the limiting tabs 24 are positioned above the support tabs 23, for more details, please refer to [Fig. 16] and the associated explanations.

[0068] [Fig.4] shows an exemplary sectional structural diagram of a sleeve of limitation according to certain embodiments of this specification.

[0069] The limiting sleeve 30 is used to limit the position of the fixing sleeve 20. In some exemplary embodiments, as illustrated in [Fig. 4], the limiting sleeve 30 comprises a guide feature component 31, first limiting holes 32, second limiting holes 33 and limiting hooks 34.

[0070] The guiding feature component 31 is a structure designed to orient the movement of the fixing sleeve 20. The guiding feature component 31 may be disposed in the center of the limiting sleeve 30. The guiding feature component 31 is capable of cooperating with the limiting tabs 24, in order to guide the fixing sleeve 20 along the central axis, allowing relative sliding with the limiting sleeve 30, while limiting the relative rotation between the fixing sleeve 20 and the limiting sleeve 30.

[0071] The first limiting holes 32 and the second limiting holes 33 are configured to limit the relative position of the fixing sleeve and the limiting sleeve. In some exemplary embodiments, as illustrated in [Fig. 4], the first limiting holes 32 and the second limiting holes 33 are respectively provided on the outer upper portion and the outer lower portion of the fixing sleeve 20, the first limiting holes 32 and the second limiting holes 33 are arranged oppositely along the central axis. The number of the first limiting holes 32 is the same as the number of the second limiting holes 33.

[0072] The limiting hooks 34 are the hook structures intended to limit the position of the fixing sleeve 20. In some exemplary embodiments, as illustrated in [Fig.5], the limiting hooks 34 are disposed at the upper end of the limiting sleeve 30. The limiting hooks 34 and the locking loops 21 cooperate to provide a fixed connection between the limiting sleeve 30 and the fixing sleeve 20.

[0073] In some exemplary embodiments, the guide feature component 31 may be a groove. In some exemplary embodiments, the length of the groove is greater than the travel of the support tab 23 from the second limiting hole 33 to the first limiting hole 32. For example, as illustrated in [Fig. 4], the length L2 of the guide feature component 31 is greater than the travel L3 of the support tabs 23 from the second limiting holes 33 to the first limiting holes 32.

[0074] In certain embodiments, the width of the groove may correspond to the width of the support tabs 23.

[0075] In some embodiments, the characteristic guide component is designed to cooperate with the support tabs, in order to avoid any shifting of the fixing sleeve during the sliding process, which could cause misalignment of the tabs with the first and / or second limiting holes, this improves the accuracy of the limits of the needle stick prevention device. In addition, by setting the length of the guide feature component to be greater than the stroke of the tabs from the second limiting holes to the first limiting holes, when the restoring force of the fixing sleeve is too high and the support tabs move out of the first limiting holes, the guide feature component can limit the continuous movement of the limiting tabs, which in turn limits the continuous movement of the fixing sleeve, thereby providing limiting protection for the fixing sleeve against loosening of this fixing sleeve.

[0076] In some exemplary embodiments, the limiting sleeve 30 also includes a protective plate, which may be disposed outside the limiting hook 34. The protective plate may have various structures, such as a U-shaped structure, etc.

[0077] In some exemplary embodiments, the limiting hooks and / or the locking loops may be protected via the arrangement of the protective plate, preventing accidental contact with the locking loop during operation.

[0078] For further details on the limiting sleeve 30, please refer to the explanations below.

[0079] In some exemplary embodiments, the needlestick prevention device 100 may have a first state, a second state, and a third state.

[0080] [Fig.5] shows an exemplary diagram of the structure of a prevention device needle pricks in a first state according to certain embodiments of this specification.

[0081] The first state corresponds to the state of the needle stick prevention device after assembly, before starting injection. In some exemplary embodiments, as illustrated in [Fig. 5], in the first state, the force accumulation part is compressed, and the fixing sleeve 20 is positioned in the first position. The first position is the relative position of the fixing sleeve 20 with respect to the limiting sleeve 30 before starting injection. When the fixing sleeve 20 is in the first position, the limiting hooks 34 and the locking loops 21 mate respectively, the support tabs 23 are positioned in the second limiting holes 33 respectively, and the limiting tabs 24 are positioned at one end of the guide feature component 31 respectively near the second limiting holes 33.

[0082] In some exemplary embodiments, during assembly, the fixing sleeve 20 may be pressed downward along the central axis, until the locking loops 21 respectively engage with the limiting hooks 34 of the limiting sleeve 30 by means of a jig. By stretching or compressing the force accumulating part, this puts the force accumulator in a force accumulating state, thereby imparting the fixing sleeve 20 with a restoring force to separate it from the limiting sleeve 30; due to the locking loops 21 engaging with the limiting hooks 34, the relative movement between the fixing sleeve 20 and the limiting sleeve 30 is thereby limited. The assembled needlestick prevention device is therefore in the first state.

[0083] For further details on the force accumulator, please refer to FIG.s 11-13 and the relevant explanations.

[0084] In some exemplary embodiments, the limiting hooks 34 may be removably coupled to the locking loops 21 via various structures. For example, the limiting hooks 34 may be coupled to the locking loops 21 via a snap-in structure.

[0085] [Fig.6] shows an exemplary diagram of the structure of a prevention device needle pricks in a second state according to certain embodiments of this specification.

[0086] The second state is the state of the needle stick prevention device when the injection is completed. In some exemplary embodiments, as illustrated in [Fig. 6], in the second state, the locking loops 21 rotate, and the locking loops 21 are separated from the limiting hooks 34, the fixing sleeve 20 and the limiting sleeve 30 are released from the limitation, and the force accumulation part is released.

[0087] In certain exemplary embodiments, the locking loops 21 can be rotated in different ways.

[0088] For example, after the injection is completed, the ends of the locking loops 21 are manually pressed or tilted, so as to rotate the locking loops 21, and the locking loops 21 are separated from the limiting hooks 34 respectively, thereby releasing the fixing sleeve 20 from the limiting sleeve 30. At this time, the force accumulating piece is released and, under the action of the force accumulating piece, the fixing sleeve 20 is caused to rebound, so that the fixing sleeve 20 and the limiting sleeve 30 are moved away from each other along the central axis.

[0089] As another example, a connecting strip is arranged at both ends of each locking loop 21, and when the injection is completed, the pressing cap presses the connecting strip, and the rotation of the locking loops is driven by the bending of the connecting strip, for details please refer to [Fig. 10] and relevant explanations.

[0090] As another example, the characteristic steps are arranged on the inner face of the pressing cap 11, and the rotation of the locking loops is driven by the pressing cap being pressed down, for details, please refer to [Fig.9] and the relevant explanations.

[0091] As another example, a trigger piece is inserted between the locking loops 21 and the limiting hooks 34, the rotation of the locking loops being driven by the triggering of the trigger piece, for details, please refer to [Fig.23] and the relevant explanations.

[0092] The modes of rotation of the locking loops 21 described above are given only as examples. In certain exemplary embodiments, the locking loops can also be rotated in other feasible ways.

[0093] [Fig.7] shows an exemplary diagram of the structure of a prevention device needle pricks in a third state according to certain embodiments of this specification.

[0094] The third state is a state in which the release of the force accumulating part of the needle stick prevention device is complete. In some exemplary embodiments, as illustrated in [Fig. 7], in the third state, the fixing sleeve 20 and the syringe assembly 10 move to a second position along the guide feature component 31. The second position is the position of the fixing sleeve 20 relative to the limiting sleeve 30 after the release of the force accumulating part, at which the release of the force accumulating part is complete. When the fixing sleeve 20 is in the second position, the support tabs 23 are respectively positioned in the first limiting holes 32, and the limiting tabs 24 are positioned at one end of the guide feature component 31 near the first limiting holes 32.

[0095] From the second state to the third state, the release of the force accumulating part causes the fixing sleeve 20 to rebound, the support tabs 23 on the fixing sleeve 20 contract inward, the limiting tabs 24 move along the characteristic component of the guide, and the support tabs 23 undergo synchronous movement, and when the support tabs 23 move toward the first limiting holes 32, the support tabs 23 expand outward under the action of the elasticity of the support tabs 23, and the first limiting holes 32 can limit the further movement of the support tabs 23. As the syringe assembly 10 is fixed relative to the fixing sleeve 20, the fixing sleeve 20 can drive the syringe assembly 10 to move together to the second position.

[0096] Some embodiments of the present specification are provided with a force accumulation part, locking loops and limiting hooks, by rotating the locking loops, the fixing sleeve can rebound quickly under the force accumulation release effect of the force accumulation part, thereby causing the needle in the limiting sleeve to rebound quickly to reduce possible damage caused by the needle to the medical personnel. The rotation of the locking loops can be excited by manually pressing or rocking the locking loops, which is easy to do, by the structural arrangements of the support tabs, the second limiting holes, the limiting tabs, the characteristic component of the guide, etc., it is possible to limit the fixing sleeve to the second positions after injection, so as to limit the position of the needle to the limiting sleeve, prevent secondary advancement, and prevent the needles from being exposed again after injection, which may cause injury to a person or secondary infection, etc. By means of the structure arrangements of the support tabs, the first limiting holes, the limiting tabs, the characteristic component of the guide, etc., it is easy to locate the fixing sleeve during installation, so as to ensure the accuracy of installation, while avoiding the relative rotation of the fixing sleeve and the limiting sleeve, which would cause displacement of the position of the limiting holes, this can improve the accuracy of limitations.

[0097] [Fig.8] shows an exemplary sectional structural diagram of a sleeve of fixing according to certain embodiments of this specification.

[0098] In some exemplary embodiments, a locking loop 21 may include a connecting feature component 211, a locking lever 212, a locking crimp 213, and a locking hook 214.

[0099] The connecting feature component 211 is a structure for connecting the locking lever 212 to the limiting sleeve 30. In some exemplary embodiments, as illustrated in [Fig.8], the connecting feature component 211 is disposed in the middle of the locking lever 212.

[0100] The locking lever 212 is a component for controlling the locking and releasing of the locking block 21. The locking lever 212 is capable of rotating about the connecting feature component 211. In some exemplary embodiments, the locking lever 212 may be rotatably connected to the connecting feature component 211. In some exemplary embodiments, such as illustrated in [Fig.8], the locking lever 212 comprises a locking crimp 213 and a locking hook 214.

[0101] The locking crimp 213 is a structure that can be rotated by pressing to drive the locking lever 212. In some exemplary embodiments, the locking crimp 213 can be pressed in various ways, for example manually or by pressing the pressure cap 11, to drive the rotation of the locking lever 212.

[0102] The locking hook 214 is a structure used to connect the locking loop 21 with the limiting hook 34.

[0103] In some exemplary embodiments, when the needle stick prevention device is in the first state, the locking crimp 213 is moved away from the central axis of the fixing sleeve 20, the locking hook 214 is moved closer to the central axis, thus the locking hook 214 is able to engage with the limiting hook 34.

[0104] In some exemplary embodiments, when the needle stick prevention device is in the second state, locking lever 212 rotates about characteristic connecting component 211, bringing locking crimp 213 close to the central axis while locking hook 214 moves away from the central axis, so locking hook 214 is then able to separate from limiting hook 34.

[0105] In some exemplary embodiments, the characteristic component of the guide 211 may comprise a connecting piece and an axis of rotation. The connecting piece is used to connect the locking loop 21 to the outside of the fixing sleeve 20. The locking lever 212 may rotate about the axis of rotation.

[0106] [Fig.9] shows an exemplary cross-sectional structural diagram of a cap of pressure according to certain embodiments of this specification.

[0107] In some embodiments, as illustrated in [Fig.4], the diameter of the pressure cap 11 gradually increases in the direction away from the fixing sleeve 20 toward the direction toward the fixing sleeve 20, and the pressure cap 11 is provided with the characteristic steps 111 therein. The characteristic steps 111 gradually increase in the direction away from the fixing sleeve 20 toward the direction toward the fixing sleeve 20.

[0108] In some embodiments, as illustrated in [Fig.9], when the pressure cap 11 is pressed down, the locking crimps 213 of the locking loops 21 are pushed inside the pressure cap 11, during the process of pressing down, the diameter of the characteristic steps 111 in contact with the locking crimps 213 gradually decreases, which drives the locking crimps 213 toward the direction approaching the central axis, making thus pivoting the locking loops 21. After rotation, the locking crimps 213 move closer to the central axis while the locking hooks 214 move away from the central axis.

[0109] In some embodiments, by adding characteristic steps on the pressure cap, it is possible to automatically separate the locking loops from the limiting hooks after injection, without requiring manual separation, after releasing the pressure cap, the elasticity of the force accumulating part automatically drives the fixing sleeve upward, which can improve work efficiency and prevent risks to medical personnel caused by forgetting to separate, such as needle exposure or risks of reinfections.

[0110] [Fig. 10] shows an exemplary schematic illustration of the structure of a connecting strip according to certain exemplary embodiments of the present specification.

[0111] In some embodiments, the needlestick prevention device also comprises a connecting bar 50, and this connecting bar 50 connects at least two locking loops 21.

[0112] The connecting bar 50 is used to connect several locking loops 21. In some embodiments, the connecting bar 50 may be a rigid rope, such as a steel cable or a fiber rope.

[0113] In certain exemplary embodiments, the connecting bar 50 can cause the locking loops 21 to rotate.

[0114] In some exemplary embodiments, there are two locking loops 21. For example, as illustrated in [Fig. 10], the connecting bar 50 is fixed respectively to the upper ends of two locking loops 21. After injection, when the pressure cap 11 is pressed down, the connecting bar 50 bends, thereby bringing the locking loops 21 together, which causes the locking loops 21 to rotate.

[0115] In some embodiments, the locking loops are connected by the connecting bar, and after injection, the locking loops rotate, thus the fixation sleeve separates from the limiting sleeve, this allows the needle to be quickly retracted after injection, without requiring manual rotation of the locking loops, thereby improving work efficiency while preventing the risks of injury and reinfection due to needle exposure.

[0116] In some embodiments of the present specification, the locking loop includes a connecting feature component, a locking lever, a locking crimp, and a locking hook, which enables the locking loop to more accurately perform rotation and limiting functions, the arrangements of the locking crimp and the locking hook enable the locking loops to achieve rotation in multiple ways, such as manually and automatically, thus meeting the needs of different scenarios.

[0117] In some exemplary embodiments, as illustrated in [Fig. 4], the limiting loop 34 includes a feature hook 341. The feature hook 341 is a hook-shaped structure provided at the upper end of the limiting loop 34. For example, the limiting loop 34 may hook the locking loop 21 via the feature hook 341. In some embodiments, the feature hook 341 may be cuttable to the locking hook 214 of the locking loop 21.

[0118] In some embodiments, when the needlestick prevention device is in a first state, the feature hook 341 may be snap-connected to the locking hook 214, to confine the securing sleeve 20 in the first position.

[0119] In some embodiments, the securing sleeve may be secured to the limiting sleeve by coupling the feature hook with the locking hook.

[0120] In some exemplary embodiments, the characteristic hook 341 and the locking hook 214 are in the range of 75° - 88°.

[0121] For example, as illustrated in [Fig. 8], the angle range a corresponding to the angle of the locking hook 214 is 75° - 88°, for example, the angle a can be set to 75°, 80°, 88°, etc. For example, as illustrated in [Fig. 4], the angle range [3 corresponding to the angle of the characteristic hook 341 is 75° - 88°, for example, the angle a can be set to 75°, 80°, 88°, etc. In some exemplary embodiments, the angle a of the locking hook 214 is the same as the angle [3 of the characteristic hook 341, which allows for a tighter fit between the characteristic hook 341 and the locking hook 214, for example, by setting both the angle a and the angle [3 to 80°.

[0122] In some exemplary embodiments, by setting the angle range of the characteristic hook and the locking hook to 75° - 88°, the problem that too small a hook angle would make the connection between the locking hook and the characteristic hook too tight and difficult to loosen is solved, while also solving the problem that too large a hook angle would make the connection between the limiting hook and the locking loop easily loosened.

[0123] [Fig. 11] shows an exemplary sectional structural diagram of a force accumulation part in the force accumulation position according to some exemplary embodiments of this specification. [Fig. 12] shows an exemplary sectional structural diagram of a force accumulation part in the released position according to some exemplary embodiments of this specification.

[0124] In some exemplary embodiments, as illustrated in [Fig. 11], the force accumulating part is an elastic cord 41. The elastic cord, such as a rubber band, is a type of cord having elasticity. One end of the elastic cord 41 is attached to the limiting hook 34 of the limiting sleeve 30, while the other end is attached to the limiting tab 24 of the fixing sleeve 20.

[0125] In the first state, as illustrated in [Fig. 11], the elastic cords 41 are in a tensioned state. When assembling, the elastic cords 41 are fixed to the limiting hooks 34 and the limiting tabs 24, and the length of the elastic cord 41 is adjusted to tension it.

[0126] In the second state, the fixing sleeve 20 disengages from the limiting sleeve 30, thereby releasing the tension of the elastic cords 41, which can then retract.

[0127] In this second state, the fixing sleeve 20 and the syringe assembly 10 can move under the effect of the elastic cords 4L. In the third state, as illustrated in [Fig. 12], the fixing sleeve 20 can move along the characteristic component of the guide 31 to the second position, thus allowing the elastic cords 41 to completely release, the distance between the limiting tabs 24 and the limiting hooks 34 decreases, and the elastic cords 41 are then in a released state.

[0128] In some exemplary embodiments, as illustrated in [Fig. 11], the limiting sleeve is equipped with the rope passage grooves 35, through which the elastic cords 41 pass. In some exemplary embodiments, the elastic cords 41 can move in the rope passage grooves 35.

[0129] In some exemplary embodiments, by configuring the elastic cords, it is possible to conveniently release the syringe assembly by releasing the elastic force of the elastic.

[0130] [Fig. 13] shows an exemplary sectional structural diagram when the force accumulating element according to certain exemplary embodiments of the present specification is a spring.

[0131] In some exemplary embodiments, the force accumulating element may be a spring 42. The spring 42 may be disposed between the securing sleeve 20 and the limiting sleeve 30, where the securing sleeve 20 is positioned near one end of the spring 42, and the limiting sleeve 30 is positioned near the other end of the spring, each having an arcuate mounting groove corresponding to the spring 42. At the assembly stage, the spring may be mounted between the securing sleeve 20 and the limiting sleeve 30 through the arcuate mounting grooves.

[0132] In the first state, the spring 42 is compressed and stores energy.

[0133] In the second state, the fixing sleeve 20 and the limiting sleeve 30 are released, allowing the spring 42 to relax and push the fixing sleeve 20 and the syringe assembly 10 into motion.

[0134] In the third state, the fixing sleeve 20 moves along the characteristic component of the guide 31 to the second position, when the fixing sleeve 20 is in the second position, the energy release of the spring 42 is complete, and the spring 42 is in a relaxed state.

[0135] By installing the spring, the elastic force of the spring can be released to drive the movement of the fixing sleeve and the syringe assembly, thereby making the release of the syringe assembly faster and more convenient.

[0136] In some exemplary embodiments, the diameters of the coils at both ends of the spring 42 are larger than the diameter of the coils in the middle of the spring 42, thereby preventing the spring 42 from striking the inner wall of the limiting sleeve 30 when it expands, thereby reducing friction and allowing the spring 42 to open quickly.

[0137] [Fig. 14] shows an exemplary schematic illustration of the local structure of a fixing sleeve according to certain exemplary embodiments of the present specification.

[0138] In some exemplary embodiments, the support tab 23 comprises a folded portion 231 and a reinforcing groove 2311 positioned on the folded portion.

[0139] The reinforcing groove 2311 is a groove structure on the folded portion 231, and, for example, as illustrated in [Fig. 14], the reinforcing groove 2311 may be positioned at the lower end of the folded portion 231. In some exemplary embodiments, the reinforcing groove 2311 makes the support piece Y-shaped.

[0140] In some exemplary embodiments, the limiting sleeve 30 also includes a receiving cavity. The receiving cavity is an internal cavity structure within the limiting sleeve 30. The receiving cavity is configured to receive the attachment sleeve 20. The receiving cavity is coaxial with the attachment sleeve 20.

[0141] In certain exemplary embodiments, the maximum distance between the folded portion 231 and the central axis of the fixing sleeve 20 is greater than the internal diameter of the receiving cavity, thus allowing the folded portion 231 to exert a limiting function on the fixing sleeve 20.

[0142] In some embodiments, by installing a folded portion and a reinforcing groove on the support tab, it is possible to strengthen the limiting and supporting effect of the support tab.

[0143] [Fig. 15] shows an exemplary schematic illustration of the local structure of a limiting sleeve according to certain exemplary embodiments of the present specification.

[0144] In some exemplary embodiments, the first limiting hole 32 and the second limiting hole 33 are both provided with reinforcing platforms. The reinforcing platforms are protruding structures on the first limiting hole 32 and the second limiting hole 33. For example, as illustrated in [Fig. 15], the bottoms of the second limiting holes 33 are respectively provided with a first reinforcing platform 37. In some exemplary embodiments, the reinforcing platforms correspond to the reinforcing grooves 2311, enabling the fixing sleeve 20 and the limiting sleeve 30 to be supported and limited.

[0145] In certain embodiments, by associating the reinforcement platforms with the reinforcement grooves, the support and limitation effect between the two components can be reinforced.

[0146] In some embodiments, the number of the support tab 23, the first limiting hole 32 and the second limiting hole 33 is respectively two.

[0147] In some exemplary embodiments, the two support tabs 23 may be arranged in various ways, for example, symmetrically outside the fixing sleeve 20, with the axis of symmetry being the central axis. The positions of the two first limiting holes 32 and the two second limiting holes 33 correspond to the two support tabs 23 along the central axis, the two first limiting holes 32 may be arranged at the upper end of the limiting sleeve 30; and the two second limiting holes 33 may be arranged at the lower end of the limiting sleeve 30.

[0148] In certain exemplary embodiments, by providing two support tabs, two first limiting holes and two second limiting holes, the limiting and supporting effect of the limiting sleeve on the fixing sleeve is reinforced.

[0149] [Fig. 16] shows an exemplary schematic illustration of the local structure of the support tabs and the limiting tabs according to certain exemplary embodiments of the present specification.

[0150] In some exemplary embodiments, the limiting tabs 24 may be disposed on the support tabs 23, and the limiting tabs 24 may be convex angles. In some exemplary embodiments, the limiting tabs 24 and the support tabs 23 may be configured as a single piece, as illustrated in [Fig. 16].

[0151] In some exemplary embodiments, the guide feature component 31 may be a groove positioned between the first limiting hole 32 and the second limiting hole 33. The dimensions of the protruding angle of the limiting tab 24 correspond to the dimensions of the groove of the guide feature component 31, thus the protruding angle of the limiting tab 24 may slide along the inside of the groove of the guide feature component 31 in the direction of the central axis.

[0152] In some exemplary embodiments, the length of the groove is greater than the travel of the support tab 23 from the second limiting hole 33 to the first limiting hole 32.

[0153] In certain exemplary embodiments, the depth of the groove is less than the thickness of the limiting sleeve 30. This can thus ensure the function of limiting the characteristic component of the guide 31.

[0154] In certain exemplary embodiments, the width of the groove is less than the width of the first limiting hole 32. This can thus ensure the function of limiting the component of the first limiting hole 32.

[0155] In some embodiments, the depth of the groove is less than the thickness of the limiting sleeve 30, and the width of the groove is less than the width of the first limiting hole 32. This can thus ensure the limiting function of the characteristic component of the guide 31 and the first limiting hole 32.

[0156] In some exemplary embodiments, the limiting tab and the support tab may be configured as a single piece, allowing the movement of the guide feature component to be synchronized with that of the limiting holes. This simplifies the structure of the fixing sleeve and makes assembly and use of the needle stick prevention device more convenient, thereby reducing production costs. The depth and width of the groove are configured to ensure that either the limiting holes or the guide feature component can act as a limiter.

[0157] [Fig. 17] presents an exemplary schematic illustration of the deployed structure of the inner wall of a limiting sleeve according to certain exemplary embodiments of this specification; [Fig. 18] shows an exemplary top view of a second limiting hole according to certain exemplary embodiments of this specification; [Fig. 19] shows an exemplary top view of the characteristic guide components according to certain exemplary embodiments of this specification.

[0158] In some embodiments, there are at least two first limiting holes 32, at least two second limiting holes 33 and at least two characteristic components of the guide 31, and at least two components guide features 31 have different lengths; the second limiting hole 22 corresponding to the longest guide feature component 31 is arranged near the bottom of the limiting sleeve 30.

[0159] It is understandable that the characteristic components of the guide 31 of different lengths can be adapted to the needles 16 of different sizes, during assembly, depending on the length of the needle, the limiting tabs 24 and the supporting tabs 23 can be associated with the characteristic components of the guide of different lengths, which improves the compatibility of the needle stick prevention device with different needles.

[0160] In some exemplary embodiments, the first limiting holes 32, the second limiting holes 33 and the characteristic components of the guide 31 may be arranged in several groups, each group comprising at least two first limiting holes 32, two second limiting holes 33 and two characteristic components of the guide 31. For example, as illustrated in [Fig.17], the first limiting holes 32, the second limiting holes 33 and the guide characteristic components 31 are arranged in quarter groups, where the first group comprises a first limiting hole 32-1, a first limiting hole 32-2, a second limiting hole 33-1, a second limiting hole 33-2, a guide characteristic component 31-1 and a guide characteristic component 31-2; similarly, the second group comprises two first limiting holes, two second limiting holes and two guide characteristic components; the third group comprises two first limiting holes, two second limiting holes and two guide characteristic components; the fourth group comprises two first limiting holes, two second limiting holes and two guide characteristic components.Since the characteristic components of the guide corresponding to the above four groups have four lengths, there are also four corresponding strokes for the support tongue to move from the second limit hole to the first limit hole, the four strokes can be suitable for four different lengths of needles.

[0161] In some exemplary embodiments, the first limiting holes 32, the second limiting holes 33 and the guide characteristic components 31 may be provided with at least two respectively. For example, as illustrated in FIGS. 18 and 19, the two guide characteristic components 31 have different lengths; a first limiting hole, a second limiting hole and a guide characteristic component respectively correspond to a specific needle size, thereby accommodating the use of two different needle sizes.

[0162] In some exemplary embodiments of the present specification, by configuring multiple strokes between the first limiting holes and the second limiting holes, the needle stick prevention device can be adapted to different needle lengths. The second limiting holes are close to the limiting bottom can increase the strokes of the first limiting holes and the second limiting holes, thereby making the needle stick prevention device suitable for longer needles. This increases the usage scenarios and meets various user needs.

[0163] [Fig.20] presents an exemplary schematic illustration of the structure the structure of an adjustment locking section according to certain embodiments of this specification.

[0164] In some exemplary embodiments, the support tab 23 is provided with an adjustment locking section 232 of a predefined shape. The adjustment locking section comprises at least one fixed position; the force accumulation part can be associated with at least one fixed position.

[0165] The adjustment locking section 232 is a structure used for adjusting the force accumulating part. For example, the adjustment locking section 232 can be used for adjusting the spring force of the force accumulating part.

[0166] The fixed position is a position on the adjustment locking section 232 used to fix the force accumulating part. For example, different fixed positions may correspond to different forces of the force accumulating part.

[0167] The predefined shape is the predetermined shape of the adjustment locking section 232. The predefined shape can take several shapes, such as serrated, hooked or annular shapes, etc.

[0168] For example, as illustrated in [Fig.20], the adjustment locking section 232 is serrated in shape. The different serrated positions correspond to different fixed positions of the adjustment locking section 232.

[0169] In some embodiments, the force accumulating part is an elastic cord 41, which is fixed at the different serrated positions, this corresponds to different lengths of the elastic cord 41 which is stretched, by adjusting the serrated position at which the elastic 41 is fixed, the length of the elastic cord 41 which is stretched can be adjusted, thereby adjusting the elastic force of the elastic cord 4L. It is understandable that the closer the serrated position is to the bottom of the support tab 23, the longer the length of the elastic cord 41 which is stretched, and the greater the corresponding elastic force, this allows choosing longer strokes and characteristic components of the corresponding guide 31.

[0170] In some embodiments, by configuring the adjustment locking section of the predefined shape, the force accumulation element elastic force can be adjusted, which enables the elastic force of the force accumulating element to adapt more precisely to the different characteristic components of the guide, thereby avoiding the elastic force being too large or too small, which could cause a mismatch between the retraction stroke and the characteristic components of the guide, thereby weakening or even making it impossible to limit by the locking loop.

[0171] [Fig.21] shows another exemplary schematic illustration of the structure of a needle stick prevention device in the first state according to some exemplary embodiments of this specification; [Fig. 22] shows an exemplary enlarged schematic illustration of a local portion of the needle stick prevention device in the first state according to some exemplary embodiments of this specification; [Fig. 23] shows an exemplary schematic illustration of the structure of a release member of the needle stick prevention device according to some exemplary embodiments of this specification.

[0172] In some exemplary embodiments, as illustrated in [Fig. 21], the needle stick prevention device also comprises release pieces 60. In some exemplary embodiments, a locking loop 21 comprises a locking hook 214, the release piece 60 can be inserted between the locking loop 21 and the limiting hook 34. For example, as illustrated in [Fig. 22], the release pieces 60 can be inserted respectively into the space between the locking loops 21 and the limiting hooks 34.

[0173] The release part 60 is a component used to separate the locking hook 214 and the limiting hook 34. In some exemplary embodiments, the release part 60 has elasticity, in some exemplary embodiments, as illustrated in [Fig.23], the release part 60 may be a U-shaped pin.

[0174] In some exemplary embodiments, the locking loops 21 may be rotated by releasing the release pieces 60. For example, the release pieces 60 may be respectively and manually inserted into the space between the locking loops 21 and the limiting hooks 34, and may be manually withdrawn or pushed in to achieve unlocking. For example, the release pieces 60 are U-shaped pins, after insertion, the release pieces 60 become tensioned and may expand under its own elasticity, thereby providing a limiting effect; after being pushed in or withdrawn, releasing the tension of the release pieces 60 may cause the locking loops 21 to rotate.

[0175] In some exemplary embodiments, by arranging the release parts to drive the locking loops to rotate, the locking loops only need to adjust the angle of the hook for the locking position, and it is not necessary to adjust the pressure angle for the locking position, thereby simplifying the structure of the locking buckle, reducing the manufacturing difficulty, and thus reducing the production cost; at the same time, the release parts have a simple structure, are easy to manufacture and have a low cost, which can further reduce costs.

[0176] [Fig.24] presents an exemplary schematic illustration of the local structure of the Needle stick prevention device according to certain embodiments of this specification.

[0177] In some embodiments, the needlestick prevention device also includes cooling parts.

[0178] The cooling part 70 denotes a component having a heat absorption cooling function. In some exemplary embodiments, the cooling part 70 is equipped with an insulating layer 71, which separates the cooling part into two internal compartments, each containing a cooling agent. The cooling agent is a chemical product capable of absorbing heat. The two internal compartments of the cooling part 70 each contain a different cooling agent, for example, water and ammonium chloride or ammonium nitrate, or barium hydroxide octahydrate and ammonium chloride may be used as inorganic salts.

[0179] In some examples, the cooling piece 70 is disposed at one end of the attachment sleeve 20 near the needle 16 and is connected to the attachment sleeve 20.

[0180] The insulating layer 71 is a component used to separate the cooling part 70. In some exemplary embodiments, the insulating layer 71 is made of a low-strength and thin material, such as thin hard plastic or polycarbonate, etc. The cooling part 70 is elastic, and the toughness of the cooling part 70 is much higher than that of the insulating layer. When the cooler 70 is subjected to an external force, the insulating layer 71 is easily damaged, while the outer material of the cooler 70 is difficult to damage.

[0181] In certain embodiments, once the injection is complete, by rubbing or pressing to break the insulating layer 71, it is possible to bring the chemicals of the different compartments into contact, thus triggering a heat absorption reaction, which makes it possible to reduce the local temperature of the space where the needle is located, and consequently, to reduce the temperature of the needle.

[0182] After injection, liquids may remain on the needle, such as the patient's bodily fluids or medications, locally cooling the space where the needle is injected. finds the needle with the help of the cooling device, it is possible to slow down the diffusion of liquids on the needle, thus further reducing the risk of bacterial infection.

[0183] [Fig.25] shows an exemplary sectional view of a fixed projection and a structure of fixed cavity according to certain exemplary embodiments of this specification; [Fig.26] shows an exemplary three-dimensional view of a fixed protrusion and a fixed cavity structure according to certain exemplary embodiments of this specification.

[0184] In some exemplary embodiments, as illustrated in [Fig. 26], the flanged fastening loop 22 comprises fixed projections 221 and deformable pieces 222. In some exemplary embodiments, the number of fixed projections 221 and deformable pieces 222 is two each, thereby ensuring better fastening. The two fixed projections 221 may be arranged symmetrically with respect to the central axis on the flanged fastening loop 22, while the deformable pieces 222 are positioned below the fixed projections 221.

[0185] In certain exemplary embodiments, the fixed projections 221 and the deformable parts 222 are both made of a deformable elastic material.

[0186] The fixed projections 221 are raised structures on the flanged fixing loop 22, as illustrated in [Fig.26], and the fixed projections 221 are arranged at the upper end of the flanged fixing loop 22. The rim of the syringe 14 can be inserted between the fixed projections 221 and the deformable pieces 222, thereby fixing it on the fixing sleeve 20.

[0187] The deformable pieces 222 are components of the flanged attachment loop 22 used to generate deformation. In some exemplary embodiments, the deformable pieces 222 may be configured in various shapes, such as rectangular or T-shaped. In [Fig. 26], the deformable pieces 222 are T-shaped. In some exemplary embodiments, the grooves may be disposed on the deformable pieces 222 near the fixed cavity 25, to provide a deformation space for the deformable pieces 222.

[0188] In certain exemplary embodiments, the fixing sleeve also comprises a fixed cavity 25.

[0189] The fixed cavity 25 is a hollow structure within the attachment sleeve 20 designed to contain the syringe body 15. In some examples, the syringe body 15 is positioned within the fixed cavity 25, while the rim of the syringe body 14 is outside the fixed cavity 25. For example, the fixed cavity 25 is coaxial with the attachment sleeve 20, as shown in [Fig. 25].

[0190] In certain exemplary embodiments, the minimum distance between the two fixed projections 221 is less than the minimum outside diameter of the rim of the syringe body. 14, which allows the fixed projections 221 to limit the upward movement of the rim of the syringe body 14.

[0191] In some exemplary embodiments, the inner diameter of the deformable parts 222 is equal to the inner diameter of the fixed cavity 25, and the vertical distance between the deformable parts 222 and the fixed projections 221 is less than the thickness of the rim of the syringe body 14. This ensures that when the rim of the syringe body 14 is wedged between the fixed projections 221 and the deformable parts 222, the fixed projections 221 can support the lower end of the syringe body 15 and the upper end of the deformable parts.

[0192] In some embodiments of the present specification, by arranging the fixed projections and the deformable parts, the rim of the syringe body can be firmly secured within the securing loops to the rim of the securing sleeve, thereby avoiding secondary damage caused by the movement of the needle driven by the syringe body.

[0193] In certain exemplary embodiments, the modulus of elasticity of the deformable parts 222 is lower than the modulus of elasticity of the fixed projections 221.

[0194] It can be understood that the lower the modulus of elasticity, the greater the relative deformation of the modulus of elasticity, the lower the stiffness, the more easily deformable and flexible the material is; the higher the modulus of elasticity, the less the material deforms in response to stress, the higher the stiffness, and the more brittle the material is. A lower modulus of elasticity of the deformable member allows for better flexibility, which is beneficial for securing larger syringe flanges within the flange lock; a higher modulus of elasticity of the fixed protrusions can better limit downward sliding of the syringe barrel. This can improve the applicability of flanged securing loops, and improve the securing efficiency.

[0195] [Fig.27] presents a schematic illustration of exemplary position of the parts of adjustment according to certain exemplary embodiments of this specification; [Fig.28] shows another schematic illustration of exemplary position of the adjustment parts according to certain exemplary embodiments of this specification; [Fig.29] shows an exemplary schematic illustration of the structure of the adjustment parts according to certain exemplary embodiments of this specification.

[0196] In some exemplary embodiments, the fixing sleeve 20 is equipped with the adjustment pieces therein. The adjustment pieces are designed to fix the protrusions of the syringe body 15. In some exemplary embodiments, the adjustment pieces may be disposed within the fixing sleeve 20.

[0197] In some exemplary embodiments, the adjustment parts are arranged to adapt to different diameters of the syringe body 15. The adjustment parts 26 can be elastic, when syringe bodies 15 of different diameters exert downward pressure, the elastic force of the adjusting member changes, thereby adapting to different diameters of the syringe body 15.

[0198] In some exemplary embodiments, as illustrated in [Fig.26], the adjustment part comprises a folded edge 261, which is placed near the needle 16, as illustrated in [Fig.27], the folded edge 261 is folded towards the central axis of the fixing sleeve 20. For example, the structure of the adjustment part is similar to that of the support tab 23, the difference is that the folded edge 261 of the adjustment part is folded inwards while the support tab 23 is folded outwards.

[0199] When the syringe bodies 15 of different diameters exert downward pressure, the bent edges 261 of the adjustment parts are compressed to different degrees, bending differently. This makes it possible to fix syringes of different diameters thanks to the restoring force of the bent edges 261.

[0200] In some exemplary embodiments, as illustrated in [Fig. 29], the adjustment part is an opening-shaped elastic ring 262; in some exemplary embodiments, as illustrated in [Fig. 28], the opening-shaped elastic ring 262 is elastically clamped in the middle of the interior of the fixing sleeve 20.

[0201] When the syringe bodies 15 of different diameters exert downward pressure, the opening of the aperture-shaped elastic ring 262 narrows or expands, thereby enabling the syringe bodies 15 of different diameters to be fixed. As an example, the structure of the aperture-shaped elastic ring 262 is illustrated in [Fig.29].

[0202] By elastically securing the opening-shaped elastic ring 262 inside the securing sleeve 20, it is possible to secure syringe bodies of different diameters while maintaining the existing structure. In some exemplary embodiments, several opening-shaped rings of different sizes may be provided with the product to meet different needs.

[0203] In some exemplary embodiments, the fixing sleeve 20 is provided with grooves therein that correspond to the thickness of the opening-shaped elastic ring 262. The opening-shaped elastic ring 262 is fixedly disposed in the middle of the fixing sleeve 20 through the groove. During the assembly process, when the diameter of the syringe body 15 is smaller, the opening-shaped ring 262 is placed outside the syringe 15. The opening-shaped elastic ring 262 gradually descends with the installation of the syringe body 15 until it is locked by the groove, thereby fixing the opening-shaped elastic ring 262 there.

[0204] In some embodiments, by adjusting the adjustment parts, syringe bodies of different diameters are fixed inside the fixing sleeve under the elastic force of the adjustment parts, so that the needle stick prevention device can be adapted to different syringe barrel diameters and increase the applicable scenarios.

[0205] The basic concepts have been described above, and it will be apparent to those skilled in the art that the foregoing detailed disclosure is intended to serve as an example only and is not a limitation of this specification. Although not expressly stated herein, a person skilled in the art may make various modifications, improvements, and amendments to this specification. Such modifications, improvements, and amendments are suggested in this specification, such that such modifications, improvements, and amendments remain within the spirit and scope of the exemplary embodiments of this specification.

[0206] Furthermore, this specification uses specific words to describe embodiments of this specification. For example, "an exemplary embodiment", "the exemplary embodiment", and / or "some exemplary embodiments" refer to a feature, structure, or particularity associated with at least one exemplary embodiment of this specification. Therefore, it should be emphasized and noted that "an exemplary embodiment" or "the exemplary embodiment" or "an alternative exemplary embodiment" mentioned two or more times in different places in this description does not necessarily refer to the same exemplary embodiment. In addition, certain features, structures, or particularities in one or more exemplary embodiments of this specification may be appropriately combined.

[0207] Furthermore, unless expressly indicated, the order of processing elements and sequences, the use of numbers and letters, or the use of other names described herein are not intended to limit the order of the processes and methods of this specification. Although a number of exemplary embodiments of the invention presently believed to be useful are discussed in the above disclosure using various examples, it should be understood that these details are for illustrative purposes only. For example, although the system components described above may be implemented via hardware devices, they may also be implemented via software-only solutions, such as installing the described system on an existing server or mobile device.

[0208] Similarly, it should be noted that, in order to simplify the presentation of the disclosure of this specification, and thus to aid in the understanding of one or more exemplary embodiments of the invention, the foregoing description of the embodiments of this specification sometimes incorporates a variety of features in a single embodiment, in the accompanying drawings or in the description of these. However, this method of disclosure does not imply that the objects of the present specification require more features than those mentioned. In fact, the exemplary embodiments have fewer features than all of the features of the single exemplary embodiment disclosed above.

[0209] In some exemplary embodiments, numbers are used to describe the quantities of components and properties, it is to be understood that these numbers used to describe the embodiments are modified by the modifiers "about," "approximately," or "substantially" in some exemplary embodiments. Unless otherwise indicated, "about," "approximately," or "substantially" means that the stated number may vary by ± 20%. Accordingly, in exemplary embodiments, the numerical parameters used are approximations, which may vary depending on the desired characteristics of the individual exemplary embodiment. In some exemplary embodiments, the numerical parameters must take into account the specified number of significant digits and use general digit preservation methods.Although the numerical ranges and parameters used to identify the extent of the ranges in some exemplary embodiments of this specification are approximations, in specific exemplary embodiments, these numerical values ​​are defined as precisely as possible.

[0210] Finally, it should be understood that the exemplary embodiments described in this specification are used only to illustrate the principles of the exemplary embodiments of this specification. Other variations may also fall within the scope of this specification. Accordingly, by way of example and not limitation, other configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to those expressly introduced and described in this specification.

Claims

1. Claims A needle stick prevention device, characterized in that it comprises a syringe assembly (10), a force accumulating piece, a fixing sleeve (20) and a limiting sleeve (30); said fixing sleeve (20) and said force accumulating piece are both positioned inside the limiting sleeve (30); one end of said force accumulating piece is fixedly connected to the fixing sleeve (20), while the other end is fixedly connected to said limiting sleeve (30); said syringe assembly (10) comprises a pressure cap (11), a syringe body rim (14), a syringe body (15) and a needle (16); said fixing sleeve (20) comprises locking loops (21), flange fixing loops (22), support tabs (23) and limiting tabs (24), said flange fixing loops (22) are arranged to fix said syringe body flange (14); said limiting sleeve (30) comprises a characteristic component of the guide (31), first limiting holes (32), second limiting holes (33) and limiting hooks (34); said needle stick prevention device has a first state, a second state and a third state; in said first state, said force accumulating part is stored forces, said fixing sleeve (20) is in a first position; when said fixing sleeve (20) is in the first position, said limiting hooks (34) and said locking loops (21) mate, said support tabs (23) are positioned respectively in said second limiting holes (33), and said limiting tabs (24) are positioned at one end of said guide feature component (31) near said second limiting holes (33); in said second state, said locking loops (21) are rotated, and said locking loops (21) are separated from said limiting hooks (34), said fixing sleeve (20) and said limiting sleeve (30) are released from limitation, and said force accumulating part is released; in said third state, said fixing sleeve (20) and said syringe assembly (10) move along said guide feature component (31) to a second position; when said fixing sleeve (20) is in the second position, said support tabs (23) are respectively positioned in said first limiting holes (32), and said limiting tabs (24) are respectively positioned at one end of said guide feature component (31) near said first limiting holes (32).

2. Device according to claim 1, characterized in that, said locking loop (21) comprises a connection characteristic component (211), a locking lever (212), a locking crimp (213) and a locking hook (214); said locking lever (212) can rotate around said connection characteristic component (211); said connection characteristic component (211) is positioned in the middle of said locking lever (212), said locking crimp (213) and said locking hook (214) are configured respectively at the two ends of said locking lever (212); in said first state, said locking crimp (213) is moved away from the central axis of said fixing sleeve (20), said locking hook (214) is moved closer to said central axis; in said second state, said locking crimp (213) moves closer to said central axis, said locking hook (214) moves away from said central axis.

3. Device according to claim 2, characterized in that, said limiting hook (34) comprises a characteristic hook (341), said characteristic hook (341) is coupleable to said locking hook (214); in said first state, said characteristic hook (341) is snap-connected to said locking hook (214), to confine said fixing sleeve (20) in said first position.

4. Device according to claim 3, characterized in that the angular range of said characteristic hook (341) and said locking hook (241) are in the range of 75° - 88°.

5. Device according to claim 1, characterized in that said force accumulation part is an elastic cord (41) one end of which is fixed to said limiting hook (34) of said limiting sleeve, while the other end is fixed to the limiting tab (24) of said fixing sleeve (20).

6. Device according to claim 5, characterized in that, said limiting sleeve (30) is equipped with a rope passage groove (35), through said rope passage groove (35), said elastic rope (41) passes.

7. Device according to claim 1, characterized in that, said support tab (23) comprises a folded portion (231) and a reinforcing groove (2311) positioned on the folded portion (231); said limiting sleeve (30) also comprises a receiving cavity, said receiving cavity is configured to receive said fixing sleeve (20); the maximum distance between said folded portion (231) and the central axis of said fixing sleeve (20) is greater than the internal diameter of said receiving cavity.

8. Device according to claim 7, characterized in that, said first limiting hole (32) and said second limiting hole (33) are both provided with reinforcing platforms, said reinforcing platforms are associated with the reinforcing grooves (2311).

9. Device according to claim 7, characterized in that the number of said support tab (23), said first limiting hole (32) and said second limiting hole (33) is respectively two.

10. Device according to claim 1, characterized in that, said limiting tabs (24) are arranged on said support tabs (23), said limiting tabs (24) are convex angles, said characteristic component of the guide (31) is a groove positioned between said first limiting hole (32) and said second limiting hole (33); the depth of said groove is less than the thickness of said limiting sleeve (30), and the width of said groove is less than the width of said first limiting hole (32).

11. Device according to claim 10, characterized in that, said first limiting hole (32), said second limiting hole (33) and said guide characteristic component (31) are each provided in at least two groups, each group corresponding to a guide characteristic component (31) having a length different from each other, each group comprising at least two of said first limiting holes (32), two of said second limiting holes (33) and two of said guide characteristic components (31); the second limiting hole (33) corresponding to the longer of the at least two of said guide characteristic components (31) is provided near the bottom of said limiting sleeve (30).

12. Device according to claim 11, characterized in that, an adjustment locking section (232) is provided on said support tongue (23) of predetermined shape, said adjustment locking section (232) comprises at least one fixed position; said force accumulation part is associated with at least one said fixed position.

13. A device according to claim 1, characterized in that said needle stick prevention device also comprises a connecting bar (50), and said connecting bar (50) connects at least two of said locking loops (21).

14. A device according to claim 1, characterized in that, said needle stick prevention device also comprises a release piece (60), said locking loop (21) comprises a locking hook (214), said release piece (60) is inserted between said locking loop (21) and said limiting hook (34).

15. Device according to claim 1, characterized in that, said rimmed fixing loop (22) comprises fixed projections (221) and deformable parts (222), the number of said fixed projections (221) and said deformable parts (222) is two each; said fixing sleeve (20) also comprises a fixed cavity, said syringe body (15) is positioned inside said fixed cavity, while said syringe body rim (14) is outside said fixed cavity; the minimum distance between said two fixed projections (221) is less than the minimum outer diameter of the rim of said syringe body (14).

16. Device according to claim 15, characterized in that the modulus of elasticity of said deformable parts (222) is lower than the modulus of elasticity of said fixed projections (221).

17. Device according to claim 1, characterized in that, said needle stick prevention device also comprises a cooling part (70), said cooling part (70) is equipped with an insulating layer (71), said insulating layer (71) separates said cooling part (70) into two internal compartments; said cooling part (70) is arranged at one end of said fixing sleeve (20) near said needle (16), and is connected to said fixing sleeve (20).

18. Device according to claim 1, characterized in that, said fixing sleeve (20) is equipped with the adjustment pieces inside, said adjustment pieces are arranged to adapt to different diameters of the syringe body (15); said adjustment piece comprises a folded edge (261), said folded edge (261) is placed near the needle (16), and said folded edge (261) is folded towards the central axis of the fixing sleeve (20); or, said adjustment piece is an opening-shaped elastic ring (262), said opening-shaped elastic ring (262) is elastically clamped in the middle of the inside of said fixing sleeve (20).

19. Device according to claim 1, characterized in that, said syringe assembly (10) comprises a plunger (13), said plunger comprises a rubber stopper (131) and a pusher (132), said rubber stopper (131) and said pusher (132) being detachably attached, and said pusher (132) and said needle (16) are provided with a pre-filled medical solution and sealed therebetween.

20. Device according to claim 19, characterized in that said syringe assembly (10) also comprises a needle cap (17).

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