Needle head assembly and injector

Abstract

The utility model relates to the technical field of medical instruments, and provides a needle head assembly and an injector, the needle head assembly comprises a needle head, a protective sleeve and an elastic piece, the needle head comprises a needle base and a needle cylinder, the needle base is provided with a mounting cavity allowing a medicine chamber to be inserted, the insertion end of the mounting cavity is an open end, the insertion termination end of the mounting cavity is a closed end, and the needle cylinder is mounted at the closed end; the protective sleeve is slidably mounted on the outer side of the needle base in the axial direction of the mounting cavity, and the elastic piece sleeves the outer side of the needle base and applies elastic force to the protective sleeve so that the protective sleeve can cover the needle cylinder. According to the needle head assembly, the needle head and the protective sleeve are integrated together, and the protective sleeve can cover the needle cylinder before or after the needle head assembly is installed on the medicine chamber when not subjected to external force, so that the needle cylinder is prevented from being exposed and stabbing a user, and secondary infection is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a needle assembly and a syringe. Background Art

[0002] At present, the syringes used in the market mainly include disposable simple syringes and syringes specially used for self-injection of drugs such as insulin. There are two main types of syringes currently used for injecting insulin. One is a disposable syringe, in which the drug is pre-installed in the syringe. When in use, the needle is inserted, and then the dose is adjusted and the syringe is directly self-injected until the drug in the syringe is used up and then discarded. The other is a repeatable syringe, which can separate the drug chamber from the drive device. When the syringe is used, the drug and the needle are installed separately, and the drug is self-administered according to the preset dose. When the drug is used up, the bottle is taken out and replaced with a new drug.

[0003] The above-mentioned syringes need to replace disposable needles for each injection to avoid bacteria on the needles and infection. These needles are all exposed with their tips. On the one hand, most syringe users do not have professional medical knowledge, and do not carry out professional medical waste treatment after each injection. There is no corresponding medical recycling station, and they are just discarded directly after one use; this treatment method easily causes the user or others to be injured by the sharp end of the needle, resulting in potential risks of infection, which in turn leads to the spread of the disease. On the other hand, when users perform self-injection or are injected, they often feel fear when seeing the syringe. Especially for underage patients, adults often fail to inject because of fear when helping them inject, and then they may need to replace the needle or a simple syringe for re-injection, which not only wastes the needle or injection solution, but also causes the patient to suffer the pain of acupuncture again, affecting the injection effect. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a needle assembly and a syringe to solve the problems existing in the above-mentioned prior art.

[0005] An embodiment of the first aspect of the present application proposes a needle assembly, comprising a needle, a protective sleeve and an elastic member, the needle comprising a needle seat and a syringe, the needle seat being provided with a mounting cavity for inserting a medicine chamber, the insertion end of the mounting cavity being an open end, the insertion termination end of the mounting cavity being a closed end, and the syringe being mounted on the closed end; the protective sleeve being slidably mounted on the outside of the needle seat along the axial direction of the mounting cavity, the elastic member being sleeved on the outside of the needle seat and applying elastic force to the protective sleeve so that the protective sleeve covers the syringe.

[0006] The needle assembly provided in the embodiment of the present application integrates the needle and the protective cover together. Whether before or after the needle assembly is installed on the medicine chamber, the protective cover can cover the syringe when no external force is applied, so as to prevent the syringe from being exposed and piercing the user, thereby preventing secondary infection. Before injection, the protective cover covers the syringe, and the patient cannot see the syringe. During injection, the protective cover can compress the elastic part under the pushing force of the skin, so that the syringe is gradually inserted into the skin. During this process, the patient cannot see the syringe either before or during injection, so as to avoid fear in the patient when seeing the syringe, thereby ensuring the success rate of injection and improving the injection effect.

[0007] In some embodiments, a slide groove is provided on one of the needle seat and the protective sleeve, and a slider slidably matched with the slide groove is provided on the other of the needle seat and the protective sleeve, wherein the slide groove extends axially along the installation cavity.

[0008] By adopting the above technical solution, the sliding groove and the slider slide together, so that when the protective sleeve slides on the needle seat along the axial direction of the installation cavity, it is prevented from rotating relative to the needle seat, thereby twisting the skin and affecting the comfort during injection.

[0009] In some embodiments, the slide groove is arranged on the outer wall surface of the needle seat, and the slider is arranged on the inner wall surface of the protective sleeve; a through hole connecting the inside and outside of the installation cavity is provided on the side wall of the needle seat close to the closed end, and a first boss is provided at one end of the slide groove close to the through hole, and an elastic arm is provided in the through hole; when the medicine chamber is inserted into the installation cavity, the elastic arm is squeezed by the medicine chamber to push the slider along the radial direction of the installation cavity, so that the slider can overcome the elastic force of the elastic member and pass over the first boss under the action of external force.

[0010] By adopting the above technical solution, before the medicine chamber is inserted into the installation cavity, the slider is blocked by the first boss and cannot move toward the open end of the needle seat, so that the syringe cannot be exposed, avoiding the risk of the syringe easily stabbing the user when taking and placing the needle assembly. After the medicine chamber is inserted into the installation cavity, the elastic arm is squeezed by the medicine chamber to push the slider in the radial direction of the installation cavity; during injection, the slider overcomes the elastic force of the elastic member under the push of the skin to pass over the first boss, thereby achieving hidden needle injection.

[0011] In some embodiments, the elastic arm includes at least two arm segments; one end of one of the arm segments is connected to the hole wall of the through hole, and the other end is inclined toward the mounting cavity and connected to the first end of the other arm segment; the other arm segment is arranged along the radial direction of the mounting cavity, and its second end cantilevers out of the mounting cavity.

[0012] The adoption of the above technical solution is beneficial to the elastic deformation of the elastic arm, so as to ensure that the elastic arm pushes the slider out of the installation cavity under the pressure of the medicine chamber.

[0013] In some embodiments, an inner wall surface of the installation cavity is provided with an internal thread, and the internal thread is used to cooperate with the external thread of the medicine chamber.

[0014] By adopting the above technical solution, the medicine chamber can be rotated and inserted into the installation cavity, which not only facilitates the assembly of the medicine chamber and the needle assembly, but also ensures the stability after assembly.

[0015] In some embodiments, the needle assembly also includes a sleeve located outside the needle seat and connected to the needle seat, the sleeve and the needle seat form an annular cavity, the elastic member is located in the annular cavity, and the slider is installed in the annular cavity along the axial direction of the installation cavity.

[0016] By arranging a jacket on the outside of the needle seat to cover the elastic member, the aesthetics of the needle assembly is improved; moreover, the annular cavity surrounded by the jacket and the needle seat is convenient for placing the elastic member and ensures the stability of the elastic member when it is compressed and deformed.

[0017] In some embodiments, a second boss is provided on the outer wall surface of the protective sleeve, and a third boss is provided on the inner wall surface of the outer sleeve, and the third boss blocks the second boss in the axial direction of the mounting cavity to prevent the protective sleeve from escaping from the annular cavity.

[0018] The third boss blocks the second boss in the axial direction of the installation cavity, so that the protective sleeve is not easy to escape from the annular cavity, thereby ensuring the stability of the needle and the protective sleeve being integrated together.

[0019] In some embodiments, a first inclined surface is disposed on a side of the first boss facing the open end; and / or a second inclined surface is disposed on a side of the sliding block facing the closed end.

[0020] By adopting the above technical solution, after the injection is completed, under the elastic force of the elastic member, the slider passes over the first boss in the direction away from the opening end through the guidance of the first inclined surface and / or the second inclined surface. When the needle assembly is separated from the medicine chamber, the elastic arm is reset and the slider returns to its initial position. The slider is blocked by the first boss and cannot move toward the opening end of the needle seat, so that the syringe cannot be exposed during the grasping process, avoiding the risk of the syringe easily stabbing the user.

[0021] In some embodiments, the protective sleeve is provided with a plurality of notches at one end where the slider is located, and the plurality of notches are arranged at intervals along the circumference of the protective sleeve to facilitate radial movement of the slider.

[0022] A second aspect of the present application provides a syringe, which comprises a medicine chamber and a needle assembly as described in the first aspect, wherein the needle assembly is mounted on the medicine chamber.

[0023] The syringe adopts all the embodiments of the needle assembly described above, and thus has at least all the beneficial effects of the above embodiments, which will not be described one by one here.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 is a schematic diagram of the structure of a needle assembly provided in some embodiments of the present application;

[0027] Figure 2 yes Figure 1 A cross-sectional view of the needle assembly taken along the line AA;

[0028] Figure 3 is a cross-sectional view of a needle provided in some embodiments of the present application;

[0029] Figure 4 yes Figure 3 An enlarged view of the needle at point B is shown;

[0030] Figure 5 is a schematic diagram of the structure of a protective cover provided in some embodiments of the present application;

[0031] Figure 6 yes Figure 5 a cross-sectional view of the protective cover shown;

[0032] Figure 7 is a schematic diagram of a structure in which a needle assembly provided in some embodiments of the present application is installed on a medicine chamber;

[0033] Figure 8 yes Figure 7 A schematic diagram of the structure of the middle needle assembly after the needle cap is removed;

[0034] Fig. 9 yes Figure 8 A schematic diagram of the structure of the middle needle assembly after the protective cover compresses the elastic member;

[0035] Fig.10 yes Fig. 9Schematic diagram of the structure after the elastic part of the needle assembly is reset.

[0036] The meanings of the marks in the figure are:

[0037] 100. Syringe;

[0038] 10. Needle assembly;

[0039] 11. needle; 111. needle seat; 1111. mounting cavity; 1112. open end; 1113. closed end; 1114. slide groove; 1115. through hole; 1116. first boss; 11161. first inclined surface; 1117. internal thread; 112. syringe; 1121. first section; 1122. second section; 1123. third section;

[0040] 12, protective cover; 121, slider; 1211, second inclined surface; 1212, third inclined surface; 122, second boss; 123, annular groove; 124, notch;

[0041] 13. Elastic parts;

[0042] 14. outer jacket; 141. third boss;

[0043] 15. Annular cavity;

[0044] 16, elastic arm; 161, first arm section; 162, second arm section; 163, third arm section;

[0045] 17. Connecting section;

[0046] 20. Medicine room;

[0047] 30. Needle cap. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] The embodiment of the first aspect of the present application provides a needle assembly that can be used for a disposable simple syringe and a syringe specifically used for self-injection of drugs such as insulin. Figure 1 , Figure 2 and Figure 7 The needle assembly 10 includes a needle 11, a protective sleeve 12 and an elastic member 13. The needle 11 includes a needle seat 111 and a syringe 112. The needle seat 111 is provided with a mounting cavity 1111 for inserting the drug chamber 20. The insertion end of the mounting cavity 1111 is an open end 1112, and the insertion termination end of the mounting cavity 1111 is a closed end 1113. The syringe 112 is mounted on the closed end 1113, and the syringe 112 is connected to the mounting cavity 1111. The protective sleeve 12 is slidably mounted on the outer side of the needle seat 111 along the axial direction of the mounting cavity 1111. The elastic member 13 is sleeved on the outer side of the needle seat 111 and applies elastic force to the protective sleeve 12, so that the protective sleeve 12 covers the syringe 112.

[0057] The needle seat 111 is provided with an installation cavity 1111, the insertion end of the installation cavity 1111 is an end for inserting the medicine chamber 20, and the insertion termination end of the installation cavity 1111 is an end for limiting the further insertion of the medicine chamber 20. The medicine chamber 20 is inserted into the installation cavity 1111 from the opening end 1112, so that the needle seat 111 and the medicine chamber 20 are fixed together, thereby fixing the needle assembly 10 and the medicine chamber 20 together.

[0058] It can be understood that the medicine chamber 20 can be directly inserted into the installation cavity 1111 to achieve an interference connection between the needle seat 111 and the medicine chamber 20; or, the medicine chamber 20 can be rotatably inserted into the installation cavity 1111 to achieve a threaded connection between the needle seat 111 and the medicine chamber 20. The needle seat 111 can be made of a plastic material, for example, the plastic material can be polypropylene, polyethylene, etc.

[0059] Optionally, the needle seat 111 is a cylindrical structure, and the axial direction of the needle seat 111 is consistent with the axial direction of the medicine chamber 20, wherein the installation cavity 1111 is a cylindrical cavity of the cylindrical structure.

[0060] Alternatively, if Figure 3 As shown, the syringe 112 includes a first section 1121 extending into the installation cavity 1111, a second section 1122 located in the needle seat 111, and a third section 1123 located outside the needle seat 111. The first section 1121 is used to be inserted into a medicine bottle installed in the medicine chamber 20, the second section 1122 enables the syringe 112 to be fixed on the closed end 1113 of the needle seat 111, and the third section 1123 is used to be inserted into the patient's skin. The syringe 112 can be made of metal material, for example, the metal material can be stainless steel, titanium alloy, etc.

[0061] Optionally, the syringe 112 is located at the center of the needle seat 111 or close to the center.

[0062] The protective sleeve 12 is a cylindrical structure with two ends open, and the protective sleeve 12 is sleeved on the outer side of the needle seat 111, that is, the axial direction of the protective sleeve 12 is consistent with the axial direction of the needle seat 111. The protective sleeve 12 can cover the third section 1123 of the syringe 112 under the elastic force of the elastic member 13 to prevent the third section 1123 of the syringe 112 from being exposed.

[0063] The elastic member 13 is sleeved outside the needle seat 111 to apply elastic force to the protective sleeve 12, that is, the axial direction of the elastic member 13 is consistent with the axial direction of the needle seat 111; it can be understood that the elastic member 13 can be a coil spring, a rubber sleeve, etc. sleeved outside the needle seat 111.

[0064] The needle assembly 10 provided in the embodiment of the present application integrates the needle 11 and the protective cover 12 together. Whether before or after the needle assembly 10 is installed on the medicine chamber 20, the protective cover 12 can cover the syringe 112 when no external force is applied, so as to prevent the syringe 112 from being exposed and piercing the user, thereby preventing secondary infection. Before injection, the protective cover 12 covers the syringe 112, and the patient cannot see the syringe 112; during injection, the protective cover 12 is pushed by the skin to compress the elastic member 13, so that the syringe 112 is gradually inserted into the skin, and the patient cannot see the syringe 112 during this process; therefore, the patient cannot see the syringe 112 before and during injection, so as to avoid the patient's fear when seeing the syringe 112, thereby ensuring the success rate of the injection and improving the injection effect.

[0065] Please also refer to Figure 2 , Figure 3 and Figure 5 In some embodiments, a slide groove 1114 is provided on the needle seat 111 , and a slider 121 slidably matched with the slide groove 1114 is provided on the protective sleeve 12 , wherein the slide groove 1114 extends axially along the installation cavity 1111 .

[0066] Specifically, the slide groove 1114 is arranged on the outer wall surface of the needle seat 111 , and the slider 121 is arranged on the inner wall surface of one end of the protective sleeve 12 close to the elastic member 13 . The slider 121 can slide in the slide groove 1114 along the axial direction of the installation cavity 1111 .

[0067] Optionally, multiple slide grooves 1114 are arranged at intervals on the circumference of the needle seat 111, for example, two, three or more; correspondingly, multiple sliders 121 are arranged at intervals on the circumference of the protective sleeve 12, and the sliders 121 are arranged one by one with the slide grooves 1114. This design can ensure the stability of the protective sleeve 12 when sliding on the needle seat 111. Of course, one slide groove 1114 can also be set on the needle seat 111.

[0068] Optionally, there is a certain distance between the slider 121 and the bottom wall of the slide groove 1114, that is, the slider 121 does not contact the bottom wall of the slide groove 1114, avoiding friction between the slider 121 and the bottom wall of the slide groove 1114 when sliding, thereby reducing the friction force when the slider 121 slides.

[0069] It can be understood that the cross-section of the slide groove 1114 can be rectangular, trapezoidal, etc., and correspondingly, the cross-section of the slider 121 can be rectangular, trapezoidal, etc.; that is, the slider 121 is adapted to the slide groove 1114 .

[0070] Optionally, the slider 121 and the protective cover 12 are integrally formed to facilitate processing of the slider 121 .

[0071] By slidingly cooperating with the slide groove 1114 and the slider 121, when the protective sleeve 12 slides axially on the needle seat 111 along the mounting cavity 1111, the protective sleeve 12 is prevented from rotating relative to the needle seat 111, thereby twisting the skin and affecting the comfort during injection, and the elastic member 13 is prevented from twisting and affecting the normal use of the elastic member 13.

[0072] In other embodiments, a sliding block 121 is provided on the outer wall surface of the needle seat 111 , and a sliding groove 1114 slidably matched with the sliding block 121 is provided on the inner wall surface of the protective sleeve 12 .

[0073] Please also refer to Figure 2 and Figure 3 In some embodiments, the slide groove 1114 is arranged on the outer wall surface of the needle seat 111, and the slider 121 is arranged on the inner wall surface of the protective sleeve 12; a through hole 1115 connecting the inside and outside of the installation cavity 1111 is provided on the side wall of the needle seat 111 near the closed end 1113, and a first boss 1116 is provided at one end of the slide groove 1114 near the through hole 1115, and an elastic arm 16 is provided in the through hole 1115; when the medicine chamber 20 is inserted into the installation cavity 1111, the elastic arm 16 is squeezed by the medicine chamber 20 to push the slider 121 along the radial direction of the installation cavity 1111, so that the slider 121 can overcome the elastic force of the elastic member 13 under the action of external force and pass over the first boss 1116.

[0074] The through hole 1115 is provided on the side wall of the needle seat 111 and connects the inside and outside of the installation cavity 1111. It can be understood that the through hole 1115 penetrates radially of the installation cavity 1111. The size of the through hole 1115 is larger than that of the slider 121, so that at least part of the slider 121 can be located in the through hole 1115.

[0075] A first boss 1116 is provided at one end of the slide groove 1114 near the through hole 1115, that is, the first boss 1116 is in the slide groove 1114. The through hole 1115 and the first boss 1116 are arranged in the axial direction of the needle seat 111, and the slider 121 can enter the slide groove 1114 after passing over the first boss 1116.

[0076] In a natural state, the first boss 1116 can stop the slider 121 in the axial direction of the needle seat 111. After the elastic arm 16 is squeezed by the medicine chamber 20, the elastic arm 16 pushes the slider 121 in the radial direction of the installation cavity 1111. It can be understood that when the third inclined surface 1212 is not provided on the side of the slider 121 facing the opening end 1112, the position of the slider 121 pushing must meet the following requirements: the diameter of the circle where the inner side surface of the slider 121 is located is greater than or equal to the diameter of the circle where the outer side surface of the first boss 1116 is located, and the first boss 1116 no longer blocks the slider 121 in the axial direction of the needle seat 111; or, when the third inclined surface 1212 is provided on the side of the slider 121 facing the opening end 1112, the position of the slider 121 pushing must meet the following requirements: the first boss 1116 abuts against the third inclined surface 1212 of the slider 121.

[0077] It should be noted that the size of the protective sleeve 12 should be such that when it is engaged with the first boss 1116 at two opposite side faces in the axial direction of the installation cavity 1111 , it can cover the syringe 112 .

[0078] Optionally, the first boss 1116 and the needle seat 111 are integrally formed.

[0079] In this embodiment, the shape of the elastic arm 16 is not limited as long as it can meet its function.

[0080] Optionally, the sliding groove 1114 , the sliding block 121 , the first boss 1116 , the through hole 1115 and the elastic arm 16 are correspondingly set to the same number, and multiple settings are more conducive to its stability.

[0081] By adopting the above technical solution, before the medicine chamber 20 is inserted into the installation cavity 1111, the slider 121 is blocked by the first boss 1116 and cannot move toward the open end 1112 of the needle seat 111, so that the syringe 112 cannot be exposed, that is, before the needle assembly 10 is assembled with the medicine chamber 20, there is no risk of stabbing the user. When the medicine chamber 20 is inserted into the installation cavity 1111, the elastic arm 16 is squeezed by the medicine chamber 20 to push the slider 121 along the radial direction of the installation cavity 1111; during injection, the slider 121 overcomes the elastic force of the elastic member 13 under the push of the skin to pass over the first boss 1116 and enter the slide groove 1114, thereby achieving hidden needle injection.

[0082] Please also refer to Figure 3 and Figure 4 In some embodiments, optionally, the elastic arm 16 includes at least two arm segments, one end of one arm segment is connected to the hole wall of the through hole 1115, the other end is inclined toward the mounting cavity 1111 and connected to the first end of the other arm segment, the other arm segment is arranged radially along the mounting cavity 1111, and its second end cantilevers out of the mounting cavity 1111.

[0083] Optionally, the elastic arm 16 includes a first arm segment 161, a second arm segment 162 and a third arm segment 163 connected in sequence, the first arm segment 161 is arranged along the axial direction of the installation cavity 1111, one end of the second arm segment 162 is connected to the hole wall of the through hole 1115 through the first arm segment 161, and the other end of the second arm segment 162 is inclined toward the installation cavity 1111 and connected to the first end of the third arm segment 163; the third arm segment 163 is arranged along the radial direction of the installation cavity 1111, and the second end of the third arm segment 163 cantilevers out of the installation cavity 1111.

[0084] Optionally, the first arm segment 161 , the second arm segment 162 and the third arm segment 163 are an integrated structure to facilitate processing of the elastic arm 16 .

[0085] One end of the second arm segment 162 is connected to the hole wall of the through hole 1115 through the first arm segment 161, which can be understood as follows: Figure 4 As shown, the upper end of the first arm segment 161 is connected to the upper hole wall of the through hole 1115 , and the lower end of the first arm segment 161 is connected to the upper end of the second arm segment 162 .

[0086] The third arm section 163 is arranged along the radial direction of the installation cavity 1111, and the second end of the third arm section 163 is cantilevered out of the installation cavity 1111. It can be understood that Figure 4 As shown, in the radial direction of the installation cavity 1111, the outer end of the third arm segment 163 is cantilevered, and the inner end of the third arm segment 163 is connected to the lower end of the second arm segment 162. When the slider 121 does not pass over the first boss 1116, the outer end of the third arm segment 163 abuts against the slider 121.

[0087] The other end of the second arm segment 162 is inclined toward the installation cavity 1111 and connected to the first end of the third arm segment 163 . It can be understood that the second arm segment 162 extends obliquely toward the installation cavity 1111 from the upper end to the lower end.

[0088] Optionally, the first arm segment 161, the second arm segment 162 and the third arm segment 163 are overall similar to a “<” and / or ">” shape, with their tips facing inward and located in the mounting cavity 1111. When the medicine chamber 20 is inserted into the mounting cavity 1111, the tip is squeezed to cause the elastic arm 16 to push the slider 121 radially outward along the mounting cavity 1111.

[0089] By adopting the above technical solution, the structure of the elastic arm 16 is simple and is conducive to the elastic deformation of the elastic arm 16 to ensure that the elastic arm 16 pushes the slider 121 out of the installation cavity 1111 under the pressure of the medicine chamber 20.

[0090] In other embodiments, the elastic arm 16 may not include the first arm segment 161 , but only include the second arm segment 162 and the third arm segment 163 , and the upper end of the second arm segment 162 is directly connected to the upper hole wall of the through hole 1115 .

[0091] In some embodiments, an internal thread 1117 is provided on the inner wall surface of the installation cavity 1111 , and the internal thread 1117 is used to cooperate with the external thread of the medicine chamber 20 .

[0092] The internal thread 1117 cooperates with the external thread on the medicine chamber 20 to realize the rotation of the medicine chamber 20 into the installation cavity 1111. When the medicine chamber 20 is rotated and inserted into the installation cavity 1111, the medicine chamber 20 squeezes the elastic arm 16 with the external thread thereon.

[0093] Optionally, the internal thread 1117 is disposed near the closed end 1113 , wherein the width of the internal thread 1117 along the axial direction of the installation cavity 1111 can be set as required, for example, the width of the internal thread 1117 is about 3 mm.

[0094] By adopting the above technical solution, the medicine chamber 20 is rotated and inserted into the installation cavity 1111, which not only facilitates the assembly of the medicine chamber 20 and the needle assembly 10, but also ensures the stability after assembly.

[0095] In other embodiments, the internal thread 1117 is not provided on the inner wall surface of the installation cavity 1111, the outer diameter of the medicine chamber 20 is larger than the inner diameter of the installation cavity 1111, and the medicine chamber 20 is interference inserted into the installation cavity 1111 to achieve the assembly of the medicine chamber 20 and the needle assembly 10; wherein, when the medicine chamber 20 is interference inserted into the installation cavity 1111, the medicine chamber 20 uses its outer wall surface to squeeze the elastic arm 16.

[0096] Please also refer to Figure 2 and Figure 3 In some embodiments, the needle assembly 10 also includes a sleeve 14 located outside the needle seat 111 and connected to the needle seat 111. The sleeve 14 and the needle seat 111 form an annular cavity 15. The elastic member 13 is located in the annular cavity 15. The slider 121 is installed in the annular cavity 15 along the axial direction of the installation cavity 1111.

[0097] The outer sleeve 14 is sleeved on the outer side of the needle seat 111 , that is, the axial direction of the outer sleeve 14 is the same as the axial direction of the needle seat 111 .

[0098] Optionally, the axial length of the outer sleeve 14 is the same as the axial length of the needle seat 111. Specifically, one end of the outer sleeve 14 close to the open end 1112 is connected to the needle seat 111; one end of the outer sleeve 14 close to the closed end 1113 is not connected to the needle seat 111, so as to form an annular opening for the protective sleeve 12 to be inserted into the annular cavity 15.

[0099] The outer sleeve 14 and the needle seat 111 can be integrally connected.

[0100] The shape of the annular cavity 15 is adapted to the shape of the protective sleeve 12. It can be understood that when the protective sleeve 12 is a circular sleeve, the annular cavity 15 is a circular cavity; when the protective sleeve 12 is an elliptical sleeve, the annular cavity 15 is an elliptical cavity; when the protective sleeve 12 is a rectangular sleeve, the annular cavity 15 is a rectangular sleeve.

[0101] In this embodiment, a sleeve 14 is provided on the outer side of the needle seat 111 to cover the elastic member 13, thereby improving the aesthetics of the needle assembly 10; moreover, the annular cavity 15 enclosed by the sleeve 14 and the needle seat 111 facilitates the placement of the elastic member 13 while ensuring the stability of the elastic member 13 during compression deformation.

[0102] Please also refer to Figures 3 to 5 In some embodiments, a second boss 122 is provided on the outer wall surface of the protective sleeve 12, and a third boss 141 is provided on the inner wall surface of the outer sleeve 14. The third boss 141 blocks the second boss 122 in the axial direction of the mounting cavity 1111 to prevent the protective sleeve 12 from escaping from the annular cavity 15.

[0103] Specifically, the second boss 122 is disposed on the outer wall surface of the protective sleeve 12 at one end close to the elastic member 13 , and the third boss 141 is disposed on the inner wall surface of the outer sleeve 14 at one end close to the closed end 1113 . The second boss 122 is located in the annular cavity 15 .

[0104] The second boss 122 and the slider 121 are located at the same end of the protective cover 12 .

[0105] Optionally, both the second boss 122 and the third boss 141 are annular bosses, and the diameter of the circle where the outer side surface of the second boss 122 lies is greater than the diameter of the circle where the inner side surface of the third boss 141 lies.

[0106] The third boss 141 is provided with a guiding slope to facilitate the second boss 122 to enter the annular cavity 15 .

[0107] The second boss 122 is blocked by the third boss 141 in the axial direction of the installation cavity 1111 , so that the protective sleeve 12 is not easily removed from the annular cavity 15 , thereby ensuring the stability of the needle 11 and the protective sleeve 12 being integrated together.

[0108] In other embodiments, the second boss 122 and the third boss 141 may not be provided, and the diameter of the closed end 1113 may be increased, so that the diameter of the closed end 1113 is larger than the diameter of the circle on which the outer surface of the first boss 1116 is located; after the slider 121 is pushed outward along the radial direction of the installation cavity 1111, it can pass over the first boss 1116 under the action of external force, and the edge of the closed end 1113 can limit the slider 121, so that the protective cover 12 will not fall out of the annular cavity 15 under the elastic force of the elastic member 13.

[0109] Please also refer to Figure 2 and Figure 5 In some embodiments, an annular groove 123 is provided on the end surface of the protective sleeve 12 , one end of the elastic member 13 is located in the annular groove 123 , and the side wall of the annular groove 123 limits the elastic member 13 in the radial direction of the installation cavity 1111 .

[0110] It can be understood that the other end of the elastic member 13 abuts against the connecting section 17 between the needle seat 111 and the outer sleeve 14; or, a baffle is provided in the annular cavity 15, and the other end of the elastic member 13 abuts against the baffle.

[0111] The annular groove 123 and the sliding block 121 are located at the same end of the protective sleeve 12 .

[0112] By adopting the above technical solution, the annular groove 123 can position the end of the elastic member 13, so that the elastic member 13 is not easily deviated from the axial direction during the expansion and contraction process.

[0113] In other embodiments, the end surface of the protective sleeve 12 is not provided with the annular groove 123 , and one end of the elastic member 13 abuts against the end surface of the protective sleeve 12 .

[0114] Please also refer to Figures 4 to 6 In some embodiments, a first inclined surface 11161 is disposed on a side of the first boss 1116 facing the open end 1112 ; a second inclined surface 1211 is disposed on a side of the slider 121 facing the closed end 1113 .

[0115] When the slider 121 is provided with a third inclined surface 1212 on the side facing the open end 1112, the size of the second inclined surface 1211 is larger than the size of the third inclined surface 1212 in the radial direction of the installation cavity 1111. With such a design, when the slider 121 is in the through hole 1115, the slider 121 needs to move outwards for a certain distance under the push of the elastic arm 16, so that the first boss 1116 can abut against the third inclined surface 1212, and the slider 121 can pass over the first boss 1116 and enter the slide groove 1114 under the push of the skin; and when the slider 121 is in the slide groove 1114, the slider 121 does not need to move outwards for a certain distance, so that the first boss 1116 can abut against the second inclined surface 1211, and the slider 121 can pass over the first boss 1116 and enter the through hole 1115 under the elastic force of the elastic member 13.

[0116] By adopting the above technical solution, after the injection is completed, under the elastic force of the elastic member 13, the slider 121 passes over the first boss 1116 in the direction away from the opening end 1112 through the guidance of the first bevel 11161 and the second bevel 1211. When the needle assembly 10 is separated from the medicine chamber 20, the elastic arm 16 is reset, and the slider 121 returns to its initial position. The slider 121 is blocked by the first boss 1116 and cannot move toward the opening end 1112 of the needle seat 111, so that the syringe 112 cannot be exposed, avoiding the risk of the syringe 112 easily stabbing the user when grasping the needle 10.

[0117] In other embodiments, the second inclined surface 1211 is not provided, and the first inclined surface 11161 may be provided only on the side of the first boss 1116 facing the open end 1112; or, the first inclined surface 11161 is not provided, and the second inclined surface 1211 may be provided only on the side of the slider 121 facing the closed end 1113.

[0118] In some embodiments, the protective cover 12 is provided with a plurality of notches 124 at one end where the slider 121 is located. The plurality of notches 124 are arranged at intervals along the circumference of the protective cover 12 to facilitate radial movement of the slider 121 .

[0119] That is, the notch 124 and the slider 121 are located at the same end of the protective cover 12 .

[0120] Optionally, two notches 124 are arranged at intervals along the circumference of the protective cover 12 .

[0121] By setting the notch 124, when the slider 121 is subjected to radial force, the end of the protective sleeve 12 close to the elastic member 13 can shrink or expand along the radial direction of the protective sleeve 12 to realize the radial movement of the slider 121, thereby facilitating the protective sleeve 12 to be inserted into the annular cavity 15 and expand outward under the extrusion of the elastic arm 16.

[0122] The working principle of the needle assembly 10 provided in the embodiment of the present application is as follows:

[0123] Before the needle assembly 10 is mounted on the medicine chamber 20, Figure 2 As shown, the slider 121 is stopped by the first boss 1116 , and under the action of external force, the slider 121 cannot go over the first boss 1116 , so that the syringe 112 will not pierce the user when the needle cap 30 is pulled out and the syringe 112 is separated from the medicine chamber 20 .

[0124] When the needle assembly 10 is installed on the medicine chamber 20, as shown in FIG. Figure 7As shown, one end of the medicine chamber 20 is screwed into the mounting cavity 1111 of the needle assembly 10. When it is screwed to the tip of the elastic arm 16, the elastic arm 16 will be squeezed, and the elastic arm 16 will push the slider 121 on the inner wall of the protective sleeve 12. At this time, when the protective sleeve 12 is subjected to pressing force, it will not be blocked by the first boss 1116, so that the protective sleeve 12 can slide on the needle seat 111.

[0125] When injecting, Figure 8 As shown, remove the needle cap 30, align the protective cover 12 with the part to be injected, and press the syringe 100; Fig. 9 As shown, the protective cover 12 squeezes the elastic member 13 under the action of the skin, and the slider 121 of the protective cover 12 passes over the first boss 1116 and enters the slide groove 1114. After the syringe 112 is inserted into place, the liquid medicine is injected, and the protective cover 12 gradually approaches the open end 1112 of the needle seat 111. After the injection is completed, the syringe 112 is pulled out. There are two situations. The first situation is: under the action of the elastic member 13, as shown in FIG. Fig.10 As shown, the protective cover 12 gradually moves away from the open end 1112 of the needle seat 111, and does not move after the slider 121 is limited and matched with the first boss 1116. At this time, the protective cover 12 can cover the syringe 112, but no matter whether the needle assembly 10 is unscrewed from the medicine chamber 20, the syringe 112 will still be exposed under the action of external force; the second situation is: under the action of the elastic member 13, as Figure 7 As shown, the protective cover 12 gradually moves away from the open end 1112 of the needle seat 111, and does not move after the slider 121 passes over the first boss 1116. At this time, the protective cover 12 can cover the syringe 112. After the needle assembly 10 is unscrewed from the medicine chamber 20, as shown in FIG. Figure 2 As shown, the slider 121 moves radially inward and is stopped by the first boss 1116 again, so that the syringe 112 will not be exposed under the action of external force, thereby avoiding the risk of injury when grasping the needle assembly 10.

[0126] Please refer to Figure 7 The second aspect of the present application provides a syringe 100. The syringe 100 comprises a medicine chamber 20 and a needle assembly 10 as described in the first aspect, and the needle assembly 10 is mounted on the medicine chamber 20.

[0127] The syringe 100 adopts all the embodiments of the needle assembly 10 described above, and thus has all the beneficial effects of the above embodiments, which will not be described one by one here.

[0128] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A needle assembly, characterized in that: It comprises a needle, a protective sleeve and an elastic member, wherein the needle comprises a needle seat and a syringe, the needle seat is provided with a mounting cavity for inserting a medicine chamber, the insertion end of the mounting cavity is an open end, the insertion termination end of the mounting cavity is a closed end, and the syringe is mounted on the closed end; the protective sleeve is slidably mounted on the outer side of the needle seat along the axial direction of the mounting cavity, the elastic member is sleeved on the outer side of the needle seat and applies elastic force to the protective sleeve so that the protective sleeve covers the syringe.

2. The needle assembly according to claim 1, characterized in that: A slide groove is provided on one of the needle seat and the protective sleeve, and a slider slidably matched with the slide groove is provided on the other of the needle seat and the protective sleeve, wherein the slide groove extends along the axial direction of the installation cavity.

3. The needle assembly according to claim 2, characterized in that: The slide groove is arranged on the outer wall surface of the needle seat, and the slider is arranged on the inner wall surface of the protective sleeve; a through hole connecting the inside and outside of the installation cavity is arranged on the side wall of the needle seat close to the closed end, and a first boss is arranged at one end of the slide groove close to the through hole, and an elastic arm is arranged in the through hole; when the medicine chamber is inserted into the installation cavity, the elastic arm is squeezed by the medicine chamber to push the slider along the radial direction of the installation cavity, so that the slider can overcome the elastic force of the elastic member and pass over the first boss under the action of external force.

4. The needle assembly according to claim 3, characterized in that: The elastic arm includes at least two arm segments; one end of one of the arm segments is connected to the hole wall of the through hole, and the other end is inclined toward the installation cavity and connected to the first end of the other arm segment; the other arm segment is arranged along the radial direction of the installation cavity, and its second end is cantilevered outside the installation cavity.

5. The needle assembly according to claim 3, characterized in that: An internal thread is provided on the inner wall surface of the installation cavity, and the internal thread is used to cooperate with the external thread of the medicine chamber.

6. The needle assembly according to any one of claims 3 to 5, characterized in that: The needle assembly also includes a sleeve located outside the needle seat and connected to the needle seat, the sleeve and the needle seat form an annular cavity, the elastic member is located in the annular cavity, and the slider is installed in the annular cavity along the axial direction of the installation cavity.

7. The needle assembly of claim 6, wherein: A second boss is provided on the outer wall surface of the protective sleeve, and a third boss is provided on the inner wall surface of the outer sleeve. The third boss blocks the second boss in the axial direction of the mounting cavity to prevent the protective sleeve from escaping from the annular cavity.

8. The needle assembly according to any one of claims 3 to 5, characterized in that: The first boss has a first inclined surface on one side facing the open end; and / or the slider has a second inclined surface on one side facing the closed end.

9. The needle assembly according to any one of claims 3 to 5, characterized in that: The protective sleeve is provided with a plurality of notches at one end where the slider is located, and the plurality of notches are arranged at intervals along the circumference of the protective sleeve to facilitate radial movement of the slider.

10. A syringe, characterized in that: The invention comprises a medicine chamber and a needle assembly as claimed in any one of claims 1 to 9, wherein the needle assembly is mounted on the medicine chamber.

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