Disposable injection needle

Abstract

The present application provides a kind of disposable injection needle, comprising: needle seat, it is provided with needle tube and needle tube passes through needle seat;Core, the first end of core is arranged in the first end of needle seat, the second end of core includes the core hole for the first end of needle tube to extend through;Protection part, it is arranged in the second end of needle seat and is provided with the protection part hole for the second end of needle tube to pass through, protection part includes the extension piece extending in the direction of needle tube;And first spring.In the first axial position, the second end of needle tube is exposed from the protection part hole, in the second axial position, the second end of needle tube is not exposed from the protection part hole.Before the use of injection needle, core is in the first circumferential position with the extension piece cooperation, after the use of injection needle, core is in the second circumferential position with the extension piece disengagement cooperation.The disposable injection needle realizes the tail end protection of injection needle, to avoid needle tip from the tail end of injection needle exposure injures and causes infection.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a disposable injection needle. Background Technology

[0002] Insulin injection needles are widely used as a tool for treating diabetes. Their main function is to control blood sugar levels by injecting insulin into diabetic patients.

[0003] Currently, the commonly available injection needles used with insulin pens consist of a large sheath, a small sheath, a needle hub, a catheter, and dialysis paper. After removing the large and small sheaths, the needle tip of the catheter is always exposed. If some patients reuse the needle, it will increase the chance of infection, or the used needle may accidentally injure others and cause cross-infection.

[0004] Furthermore, while most safety insulin needles on the market avoid reuse, they only protect the front end and not the back end, thus still posing a safety hazard. Existing dual-ended products that provide protection at both ends are overly complex in structure and lack stability. Summary of the Invention

[0005] To alleviate or solve at least one of the above problems, the present invention provides a disposable injection needle that provides rear-end protection of the injection needle, thereby preventing the needle tip from protruding from the tail end of the injection needle and causing injury and infection. The disposable injection needle has a simple structure and provides reliable stability.

[0006] According to an embodiment of the present invention, a disposable injection needle is provided, comprising: a needle seat, wherein the needle seat is provided with a needle tube, the needle seat having a first end and a second end, the needle tube passing through the needle seat; a core, the first end of the core being adapted to be disposed at the first end of the needle seat, the second end of the core including a core hole through which the first end of the needle tube extends; a protective portion, the protective portion being adapted to be disposed at the second end of the needle seat and having a protective portion hole through which the second end of the needle tube passes, the protective portion including an extension member extending generally along the direction of the needle tube, the protective portion having a first axial position and a second axial position along the extension direction of the needle tube, wherein in the first axial position the second end of the needle tube protrudes from the protective portion hole, and in the second axial position the second end of the needle tube does not protrude from the protective portion hole; and a first spring, the first spring being disposed between the needle seat and the protective portion to provide power for the protective portion to move from the first axial position toward the second axial position. The core has a first circumferential position and a second circumferential position; before the injection needle is used, the core is in the first circumferential position engaging with the extension member, and after the injection needle is used, the core is in the second circumferential position disengaged from the extension member. Based on the core rotating from the first circumferential position to the second circumferential position, the protective part is adapted to move from the first axial position toward the second axial position under the action of the first spring. Attached Figure Description

[0007] The above and other aspects and features of the present invention will become clear from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

[0008] Figure 1 This is a perspective view of a disposable injection needle according to an embodiment of the present invention;

[0009] Figure 2 yes Figure 1 A schematic cross-sectional view of a disposable injection needle shown;

[0010] Figure 3 and Figure 4 These are perspective views of the needle holder according to an embodiment of the present invention, viewed from different perspectives.

[0011] Figure 5 and Figure 6 These are perspective views of the core according to an embodiment of the present invention, viewed from different perspectives.

[0012] Figure 7 This is a perspective view of the protective portion according to a first embodiment of the present invention;

[0013] Figure 8 This is a front view of the protective portion according to a second embodiment of the present invention;

[0014] Figure 9 and Figure 10 These are perspective views of the protective portion according to the third embodiment of the present invention, viewed from different angles, wherein the extension has a locking portion;

[0015] Figure 11 and Figure 12 These are perspective views of the housing of a disposable injection needle according to an embodiment of the present invention, viewed from different perspectives.

[0016] Figure 13 and Figure 14 These are perspective views of the sheath according to an embodiment of the present invention, viewed from different perspectives;

[0017] Figure 15 This is a schematic diagram of the assembly of the housing and sheath of a disposable injection needle according to an embodiment of the present invention;

[0018] Figure 16 This is an assembly diagram of the pin holder, core, and protective part in their initial assembly state according to an embodiment of the present invention.

[0019] Figure 17 This is a schematic diagram of a disposable injection needle in its initial assembled state according to an embodiment of the present invention, wherein a portion of the housing and sheath have been removed;

[0020] Figure 18 This is a cross-sectional view of a disposable injection needle in its initial assembly state according to an embodiment of the present invention;

[0021] Figure 19 This is a structural diagram of a disposable injection needle according to an embodiment of the present invention during use, wherein the sheath is pressed down and the first end of the needle tube reaches the sheath opening, and a portion of the housing and sheath are removed;

[0022] Figure 20 The disposable injection needle according to an embodiment of the present invention is in Figure 19 The diagram shown illustrates the structural process during use, in which a portion of the housing, a portion of the sheath, and the second spring are removed.

[0023] Figure 21 This is a structural diagram of a disposable injection needle according to an embodiment of the present invention during use, wherein the needle tube is in its longest exposed state and a portion is removed to show the internal structure;

[0024] Figure 22 This is a cross-sectional view of a disposable injection needle according to an embodiment of the present invention during use, wherein the needle tube is in its longest exposed state;

[0025] Figure 23 This is a schematic diagram of the structure of a disposable injection needle after use, according to an embodiment of the present invention, wherein a portion has been removed to show the internal structure; and

[0026] Figure 24 This is a schematic diagram of a disposable injection needle subjected to downward pressure again after use, according to an embodiment of the present invention, with a portion removed to show the internal structure. Detailed Implementation

[0027] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0028] First, a disposable injection needle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that some features or components are not specifically shown in the drawings for clarity.

[0029] See Figure 1The disposable injection needle of this invention includes a needle hub 10, a core 20, a protective part 30, and a first spring 40. The needle hub 10 is provided with a needle tube 50, which has a first end 11 and a second end 12, and the needle tube 50 passes through the needle hub 10. Figure 2 and Figure 5 As shown, the core 20 has a first end 21 and a second end 22. The first end 21 is adapted to be disposed at the first end 11 of the needle holder 10, and the second end 22 includes a core hole 201 through which the first end 51 of the needle tube 50 extends. See also Figure 2 , Figure 9 and Figure 10 The protective portion 30 is adapted to be disposed at the second end 12 of the needle holder 10, and is provided with a protective portion hole 301 through which the second end 52 of the needle tube 50 passes. The protective portion 30 includes an extension 302 that extends generally along the needle tube direction. The protective portion 30 has a first axial position and a second axial position along the needle tube extension direction. In the first axial position, the second end 52 of the needle tube 50 protrudes from the protective portion hole 301 (e.g., ...). Figure 18 As shown in the diagram), in the second axial position, the second end 52 of the needle tube 50 does not protrude from the protective hole 301 (as shown in the diagram). Figure 22 As shown). Figure 2 , Figure 18 and Figure 22 As shown, a first spring 40 is disposed between the needle holder 10 and the protective portion 30 to provide power for the protective portion 30 to move from the first axial position toward the second axial position. Furthermore, the core 20 has a first circumferential position and a second circumferential position. Before use of the injection needle, the core 20 is in the first circumferential position that mates with the extension 302 (e.g., ...). Figure 16 and Figure 17 As shown in the diagram), after the injection needle is used, the core 20 is in the second circumferential position where it is disengaged from the extension 302 (as shown in the diagram). Figure 22 As shown in the diagram, based on the rotation of the core 20 from the first circumferential position to the second circumferential position, the protective part 30 is adapted to move from the first axial position toward the second axial position under the action of the first spring 40.

[0030] In an embodiment of the invention, a protective portion 30 is disposed at the second end 12 of the needle holder 10, and has a protective portion hole 301 through which the second end 52 of the needle tube 50 passes. The protective portion 30 includes an extension 302 that extends substantially along the direction of the needle tube. In the initial assembled state of the disposable injection needle, for example... Figure 16-18As shown, the protective part 30 is placed at the second end 12 of the needle holder 10, and the protective part hole 301 passes through the needle tube 50. At this time, the protective part 30 is in a first axial position where the second end 52 of the needle tube 50 is exposed from the protective part hole 301, and the core 20 is in a first circumferential position that engages with the extension 302. When using a disposable injection needle, after applying an external force to the disposable injection needle, the core 20 rotates from the first circumferential position that engages with the extension 302 to a second circumferential position that disengages from the extension 302. Based on the core 20 rotating from the first circumferential position to the second circumferential position, the protective part 30 moves from the first axial position to the second axial position under the action of the first spring 40. When the core 20 rotates to the second circumferential position, the core 20 disengages from the extension 302. At this time, the protective part 30 moves to the second axial position under the elastic force of the first spring 40 to cover the second end 52 of the needle tube 50 (e.g., Figure 22 (as shown in the image), thus preventing the needle 50 from protruding from the tail end of the injection needle and causing injury or infection.

[0031] Further, see Figure 3 and Figure 4 The needle holder 10 has a partition 101, and the first end 11 and the second end 12 of the needle holder 10 are respectively located on both sides of the partition 101. In the first axial position of the protective portion, the extension 302 extends through the partition 101 and engages with the core 20, such as... Figure 16 and Figure 18 As shown in the diagram. Additionally, the extension 302 is adapted to mate with the partition 101 to define a second axial position of the protective portion 30. (As shown in the diagram...) Figure 22 As shown, when the protective part 30 is in the second axial position, the extension 302 is in a mating state with the partition 101.

[0032] like Figure 3 and Figure 4 As shown, in one embodiment, the second end 12 of the needle holder 10 is provided with a through groove 102, and the extended end 303 of the extension member 302 is adapted to pass through the through groove 102 and engage with the core 20 to keep the protective part 30 in the first axial position (e.g., Figure 16 (as shown in the image).

[0033] According to a first embodiment of the present invention, such as Figure 7 As shown, the protective portion 30 includes a plurality of extensions 302. For example, Figure 7 The diagram exemplarily illustrates two extensions 302 arranged symmetrically in the circumferential direction. Based on the rotation of the core 20 from a first circumferential position to a second circumferential position, the protective portion 30 moves from a first axial position toward a second axial position under the action of the first spring 40 to cover the second end 52 of the needle tube 50 (e.g., Figure 22(As shown in the diagram). When the extension fitting 203 disengages from the extension end 303, the protective part 30 moves towards the tail end under the action of the first spring 40, covering the second end 52 of the needle tube 50. At this time, if the protective part 30 is further pushed towards the tail end, it will deflect relative to the axial direction, causing the second end (i.e., the tail end) 52 of the needle tube 50 to abut against the inner wall of the protective part 30, thus preventing alignment with the protective part hole 301. Therefore, the second end 52 of the needle tube 50 cannot protrude from the protective part hole 301, thereby protecting the user from accidental needle puncture. Figure 7 In the first embodiment shown, the plurality of extensions 302 have the same height in the needle extension direction (i.e., the axial direction of the disposable injection needle). Optionally, as Figure 8 As shown, in the second embodiment, the plurality of extensions 302' may have different heights in the needle extension direction (i.e., the axial direction of the disposable injection needle). Although Figure 7 and Figure 8 Two extensions are shown, but this is only for illustrative purposes; the number of extensions can be selected as needed.

[0034] In a third embodiment of the present invention, the extension 302 may have an engaging portion 304, such as... Figure 9 As shown in the figure. Based on the movement of the protective part 30 from the first axial position toward the second axial position, the engaging part 304 is adapted to engage from one side of the partition 101 (e.g. Figure 18 (As shown) Move to the other side of the partition (as shown) Figure 22 (As shown in the diagram). In one embodiment, the extension 302 can be an elastic element. As the engaging portion 304 moves from one side of the partition 101 toward the other side of the partition 101, the engaging portion 304 abuts against the partition 101 and continues to move toward the tail end of the injection needle under the thrust of the first spring 40. Since the extension 302 is an elastic element, the engaging portion 304 will move radially inward past the partition 101 to the other side of the partition. At this time, as... Figure 22 As shown, the bottom surface 305 of the protective part 30 is closer to the tail end of the injection needle than the second end 52 of the needle tube 50, and because the partition 101 is located between the extended end 303 of the extension member 302 and the engaging part 304, it cannot be pressed down, so that the second end 52 of the needle tube 50 cannot be exposed from the hole 301 of the protective part, thereby protecting the user from accidental needle puncture. Additionally, in Figure 22 In the state shown, delivery devices such as safety insulin needles cannot be reconnected to the injection needle and are therefore unusable.

[0035] See Figure 5 and Figure 16The core 20 has a boss 202 extending radially from its first end 21, and an extension fitting portion 203 extending from the boss 202 toward the second end 22 of the core. At a first circumferential position of the core 20, the extension end 303 of the extension 302 engages with the extension fitting portion 203, while at a second circumferential position of the core 20, the extension end 303 of the extension 302 disengages from the extension fitting portion 203.

[0036] Further, see Figure 1 The disposable injection needle may also include a housing 60, a sheath 70, and a second spring 80. For example... Figure 2 , Figure 11 and Figure 12 As shown, the first end 61 of the housing 60 is connected to the second end 12 of the needle holder 10, and the second end 62 of the housing 60 has a housing opening 601. Figure 2 and 13 As shown, the first end 71 of the sheath 70 is located within the housing 60, the second end 72 of the sheath 70 has a sheath opening 701 and extends from the housing opening 601, and a portion of the sheath is axially slidably located within the housing 60. A second spring 80 is adapted to provide a spring force that causes the sheath 70 to move axially toward the outside of the housing. The sheath 70 is adapted to retract toward the housing based on an external force overcoming the spring force of the second spring 80, so that the needle 50 is exposed through the sheath opening 701 (e.g., ...). Figure 22 As shown). Figure 3 , Figure 5 and Figure 17 As shown, the first end 21 of the core 20 is provided with a radially extending core guide portion 204, and the needle holder 10 is provided with a guide mating portion. In the mounting position of the core 20 and the needle holder 10, the core guide portion 204 mates with the guide mating portion, as shown... Figure 17 As shown. Figure 19-23 As shown, based on the movement of the sheath 70 toward the housing 60, the core guide 204 moves along the guide engagement portion to guide the core 20 to rotate in the circumferential direction from the first circumferential position to the second circumferential position, and is adapted to move to disengage from the guide engagement portion.

[0037] In an embodiment of the present invention, a core 20 may be fitted onto the needle hub 10 of the disposable injection needle, and the needle tube 50 extends axially through the core hole 201 of the core 20 and is exposed through the sheath opening 701 of the sheath 70. In the initial assembled state of the disposable injection needle, for example as... Figure 17As shown, the first end 71 of the sheath 70 is fitted onto the core 20 and located inside the housing 60. The first end 61 of the housing 60 is connected to the second end 12 of the needle holder 10, and the second end 62 mates with the sheath 70. At this time, the core guide 204 of the core 20 mates with the guide mating part of the needle holder 10, and the protective part 30 is in a first axial position where the second end 52 of the needle tube 50 protrudes from the protective part hole 301. The core 20 is in a first circumferential position where it mates with the extension 302. When using the disposable injection needle, after applying an external force to the disposable injection needle, the sheath 70 moves towards the needle holder 10 under the action of the external force, that is, it retracts towards the housing 60, which will generate a pushing force on the core 20. Under this thrust, the core 20 rotates circumferentially, causing the core guide 204 to move along the guide engagement portion to guide the core 20 to rotate circumferentially, and continues to move to disengage from the guide engagement portion so that the sheath moves axially outward from the housing under the spring force, thereby covering the syringe to avoid secondary use and increase the chance of infection. During this process, the core 20 rotates from a first circumferential position engaged with the extension 302 to a second circumferential position disengaged from the extension 302. Based on the core 20 rotating from the first circumferential position to the second circumferential position, the protective portion 30 moves from the first axial position to the second axial position under the action of the first spring 40. When the core 20 rotates to the second circumferential position, the core 20 disengages from the extension 302. At this time, the protective portion 30 moves to the second axial position under the spring force of the first spring 40 to cover the second end 52 of the syringe 50 (e.g., Figure 22 As shown in the diagram, this design prevents the needle 50 from protruding from the tail end of the injection needle, thus avoiding injury and infection. Therefore, the disposable injection needle of the present invention has a dual-end protection function at both the front and rear ends, and its structure is simple, stable, and reliable.

[0038] Further, see Figure 13 The sheath 70 has a small-diameter portion 702 and a large-diameter portion 703 connected to each other in the axial direction, the small-diameter portion and the large-diameter portion forming a stepped surface 704 at the connection. The small-diameter portion 702 is adapted to extend from the housing opening 601 beyond the sheath 70, and the distal end of the small-diameter portion 702 has the sheath opening 701. Additionally, as... Figure 11 As shown, the second end 62 of the housing 60 has a housing blocking surface 602 that defines a housing opening 601. A stepped surface 704 is adapted to abut against the housing blocking surface 602 (e.g., ...). Figure 2 and 17 (as shown in the diagram), and the large-diameter portion 703 is axially slidable within the housing 60.

[0039] like Figure 5 , Figure 14 and Figure 21As shown, in one embodiment, the inner wall of the sheath 70 is provided with a blocking member 705 extending in the axial direction, and the outer wall of the core 20 is provided with a limiting guide groove 205 extending in the axial direction (e.g., Figure 6 As shown in the diagram. Based on the rotation of the core 20 in the circumferential direction, the blocking member 705 moves within the limiting guide groove 205, as shown in the diagram. Figure 19 and 21 As shown in the figure. Optionally, the inner wall of the sheath 70 may be provided with a plurality of spaced-apart stoppers 705 (such as...). Figure 14 As shown in the figure, the outer wall of the core 20 is provided with a plurality of limiting guide grooves 205 spaced apart from each other, and each of the plurality of blocking members 705 moves within a corresponding limiting guide groove in the plurality of limiting guide grooves 205 based on the circumferential rotation of the core 20.

[0040] In embodiments of the present invention, such as Figure 5 As shown, the limiting guide groove 205 may include a first guide groove portion 2051 and a second guide groove portion 2052 arranged in the axial direction, wherein the dimension of the first guide groove portion in the circumferential direction is larger than the dimension of the second guide groove portion in the circumferential direction. Based on the circumferential rotation of the core 20, the blocking member 705 is adapted to rotate from the first guide groove portion 2051 in both the axial and circumferential directions to the second guide groove portion 2052 and be blocked in the second guide groove portion 2052, thereby preventing further rotation of the core, such as... Figure 19-21 As shown in the diagram. For example, when the core rotates to the point where the sidewall of the blocking member 705 engages with the sidewall of the limiting guide groove 205, further rotation of the core is prevented.

[0041] Alternatively, the end of the first guide groove portion 2051 near the second guide groove portion 2052 may be provided with a guide surface 2053, and the end of the blocking member 705 is provided with a mating surface that cooperates with the guide surface 2053.

[0042] like Figure 5 As shown, in an embodiment of the invention, the two sidewalls of the limiting guide groove 205 extend in the circumferential direction to near the core hole 201 to form a sheath blocking surface 206. After the external force applied to the sheath is removed, the sheath 70 moves toward the sheath opening 701 under the elastic force of the second spring 80, as... Figure 23 As shown in the diagram. Thus, after the injection needle of the present invention has been used, if the sheath is pressed down again, the end of the sheath blocking member 705 will abut against the sheath blocking surface 206 of the core 20. Therefore, the second sheath cannot be compressed back into the housing for a second time, thus preventing the needle from being exposed and avoiding accidental injury to others and cross-infection caused by the used needle.

[0043] like Figure 3As shown, a partition 101 may be provided at the bottom of the needle holder 10, with the first end 11 and the second end 12 of the needle holder on opposite sides of the partition. The partition 101 has a limiting plane 1011, and a guiding mating part extends axially from the limiting plane 1011 toward the housing opening 601 and is located at the edge of the limiting plane 1011. After the core 20 completes its circumferential rotation, the first end 21 of the core abuts against the limiting plane 1011 to prevent further axial movement of the core. The needle holder 10 may also be provided with a core limiting part 103 that connects with the guiding mating part, the core limiting part 103 being adapted to prevent further circumferential movement of the core 20 after completing its circumferential rotation.

[0044] Furthermore, such as Figure 5 As shown, the first end 21 of the core 20 is provided with a boss 202 extending radially from the core. The core guide 204 extends radially from the edge of the boss 202 toward the needle holder 10 (e.g., ...). Figure 20 As shown in the figure), and the guide fitting part is provided on the radially outer side of the boss part 202 (as shown in the figure). Figure 17 (As shown in the diagram). The boss portion 202 has a boss top surface 2021 and a boss bottom surface 2022, and one end of the second spring 80 abuts against the boss top surface 2021. After the core 20 has rotated circumferentially, the boss bottom surface 2022 or the core guide portion 204 abuts against the limiting plane 1011.

[0045] Further optional, see Figure 3 The guiding mating portion of the needle seat 10 may include a planar guiding portion 104 and an inclined guiding portion 105 extending obliquely from the planar guiding portion to the limiting plane 1011. For example... Figure 17 As shown, in the mounting position of the core 20 and the pin holder 10, the core guide portion 204 mates with the planar guide portion 104. Figure 19 and 23 As shown, based on the movement of the sheath 70 toward the housing 60, the core guide 204 rotates from the planar guide 104 to the inclined guide 105 in the circumferential direction to guide the core to rotate in the circumferential direction, and the core guide 204 is adapted to move to disengage from the inclined guide 105.

[0046] In one exemplary embodiment, the needle holder 10 may be provided with a plurality of guiding mating parts 104, 105, and the core limiting part 103 is a core limiting groove between two adjacent guiding mating parts among the plurality of guiding mating parts, such as... Figure 3 As shown in the image.

[0047] like Figure 3As shown, the needle hub 10 may further include a sheath blocking portion 106, which is adjacent to the guide mating portion. The sheath blocking portion 106 has a greater axial height than the guide mating portion in the axial direction, and the sheath blocking portion 106 is adapted to prevent the sheath 70 from moving toward the housing 60. In one embodiment, as... Figure 3 As shown, the needle holder 10 has a needle holder through hole 107 at its center for the needle tube 40 to pass through.

[0048] See Figure 11 and 12 The first end 61 of the housing 60 is provided with a base 603, and the inner wall of the base is provided with a transverse groove 604 arranged circumferentially. Figure 3 As shown, the second end 12 of the needle holder 10 is provided with a transverse rib 108, which is arranged radially around the outer wall of the needle holder. When the disposable injection needle is assembled, the transverse rib 108 fits into the transverse groove 604 to fix the axial position of the needle holder 10 and the housing 60.

[0049] See also Figure 3 The second end 12 of the needle holder 10 may also be provided with a needle holder groove 109 extending in the axial direction, the needle holder groove being located on the outer wall of the needle holder. For example... Figure 11 and 15 As shown, the inner wall of the base 603 of the housing 60 may also be provided with a rib 605 extending in the axial direction. The rib is adapted to fit in the needle holder slot 108 to prevent the needle holder 10 from rotating circumferentially relative to the housing 60.

[0050] In embodiments of the present invention, such as Figure 13 As shown, the first end of the sheath 70 may be provided with a sheath limiting groove 706, which is formed on the outer wall of the sheath. The inner wall of the housing 60 is provided with a limiting rib 606 extending in the axial direction, which is adapted to fit into the sheath limiting groove, such as... Figure 11 , 12 As shown in Figure 15.

[0051] In one alternative embodiment, such as Figure 13 As shown, the sheath limiting groove 706 may include a first limiting groove portion 7061 and a second limiting groove portion 7062 arranged along the axial direction. The first limiting groove portion has a triangular cross-section, and the second limiting groove portion has a rectangular cross-section. In this embodiment, the width of the first limiting groove portion 7061 is greater than the width of the second limiting groove portion 7062, so as to facilitate the insertion of the limiting rib 606 into the sheath limiting groove 706, thereby making the assembly of the sheath and the housing easier. It should be noted that the structure and shape of the sheath limiting groove are merely illustrative and are not intended to limit it.

[0052] In optional embodiments, such as Figure 1 and 2 As shown, the disposable injection needle may also include an outer cover 90, which externally connects to the needle seat 10, the core 20, the housing 60, and the sheath 70.

[0053] Optionally, a first anti-rotation structure (e.g., a rib or protrusion, or an interference fit structure) may be provided at the connection between the housing 60 and the needle seat 10, and a second anti-rotation structure (e.g., an anti-rotation rib or protrusion, or an interference fit structure) may be provided at the connection between the outer cover 90 and the housing 60.

[0054] Optionally, such as Figure 1 and 2 As shown, the disposable injection needle may also include a sealing sticker 100 that covers the opening of the outer cover 90. Before using the disposable injection needle, the sealing sticker 100 must be torn off and the outer cover 90 removed to take out the internal components, thereby further preventing the injection needle from becoming ineffective due to misoperation before it is used.

[0055] The assembly process of an injection needle according to an exemplary embodiment of the present invention will now be described with reference to the above structure.

[0056] First, the needle tube 50 is passed through the needle seat through hole 107 of the needle seat 10, for example, by adhesive bonding. Next, the needle seat 10 with the needle tube is inserted into the bottom of the core 20, and the needle tube 50 passes through the core hole 201 of the core. At this time, the core guide portion 204 of the core 20 contacts the planar guide portion 104 of the needle seat 10.

[0057] Next, the second spring 80 is fitted over the core 20. One end of the second spring 80 abuts against the boss 202 of the core 20, and the other end contacts the blocking member 705 of the sheath 70.

[0058] Then, the assembled components are placed into the housing 60 from the bottom. The sheath 70 extends from the housing opening 601, and the needle seat groove 109 of the needle seat 10 engages with the protruding rib 605 of the housing 60 to prevent the needle seat 10 from rotating circumferentially with the housing 60. The transverse rib 108 of the needle seat 10 engages within the transverse groove 604 of the housing 60 to fix the axial position of the needle seat 10 and the housing 60. Under the action of the second spring 80, the stepped surface 704 of the sheath 70 contacts the housing blocking surface 602 of the housing 60, reaching the initial assembly state, such as... Figure 17 As shown in the image.

[0059] The protective part 30 is located at the second end 12 of the needle holder 10, and the protective part hole 301 passes through the needle tube 50. At this time, the protective part 30 is in a first axial position where the second end 52 of the needle tube 50 is exposed from the protective part hole 301, and the core 20 is in a first circumferential position that mates with the extension 302, such as... Figure 18 The initial assembly state is shown. The extended end 303 of the protective part 30 protrudes from the through slot 102 of the needle seat 10 and engages with the core 20 (e.g., with the extension mating part 203). The first spring 40 is placed between the protective part 30 and the needle seat 10, with one end of the first spring 40 touching the bottom surface 306 of the protective part 30 (e.g., the bottom surface 306 of the protective part 30). Figure 10 (As shown in the diagram) The other end contacts the needle seat blocking surface 110 inside the needle seat 10 cavity.

[0060] The operation process of a disposable injection needle according to an exemplary embodiment of the present invention will now be described with reference to the above structure.

[0061] When using the disposable injection needle, the sheath 70 moves towards the needle hub 10 under external force, that is, moves towards the housing 60. When the blocking member 705 of the sheath 70 contacts the guide surface 2053 of the core 20, the blocking member 705 exerts a pushing force on the guide surface 2053. Under this pushing force, the core 20 rotates circumferentially, and the core guide portion 204 of the core 20 and the planar guide portion 104 of the needle hub 10 gradually separate from the contact state until the core guide portion 204 and the planar guide portion 104 are no longer in contact. Figure 19 As shown. During this process, the extension mating part 203 of the core 20 rotates circumferentially relative to the extension end 303 of the protective part 30.

[0062] After the core guide portion 204 of the core 20 separates from the planar guide portion 104 of the needle holder 10, the core 20 continues to move circumferentially under the elastic force of the second spring 80 and contacts the inclined guide portion 105 of the needle holder 10. This causes the core 20 to rotate circumferentially while moving axially. During this process, the blocking member 705 of the sheath moves within the limiting guide groove 205 of the core 20 until the core 20 rotates to the point where the side wall of the blocking member 705 engages with the side wall of the limiting guide groove 205, preventing further rotation of the core. Figure 21 As shown. As previously described, due to the circumferential rotation of the core 20, the extension mating portion 203 of the core 20 rotates circumferentially relative to the extension end 303 of the protective portion 30. When the extension mating portion 203 disengages from the extension end 303, the protective portion 30 moves towards its tail end under the action of the first spring 40 until the engaging portion 304 of the protective portion 30 moves axially from one side of the partition 101 of the needle seat 10, across the partition 101, to the other side of the partition. At this time, the partition 101 is located between the extension end 303 of the extension 302 and the engaging portion 302, as shown. Figure 22As shown. During movement, when the engaging portion 304 contacts the partition 101, the extension 302 of the protective portion 30 deforms and moves radially inward until the engaging portion 304 moves past the partition 101 to the other side of the partition. Then, the extension 302 of the protective portion 30 returns to its original state. At this time, because the partition 101 is located between the extended end 303 of the extension 302 and the engaging portion 302, it cannot be pressed down, preventing the second end (i.e., the tail end) 52 of the needle 50 from protruding from the protective portion hole 301, thereby protecting the user from accidental needle puncture. Furthermore, in Figure 22 In the state shown, delivery devices such as safety insulin needles cannot be reconnected to the injection needle and are therefore unusable.

[0063] As the sheath 70 moves toward the needle hub 10, the needle tube 40 protrudes from the core hole 201 of the sheath 70. When the sheath 70 is pressed down until its bottom surface 707 (as shown) Figure 14 When the needle tube 40 (as shown) contacts the sheath blocking portion 106 of the needle hub 10 or when the core hole 201 is lower than the housing opening 601 of the housing 60, the needle tube 40 is exposed at its longest length. Figure 22 As shown.

[0064] After the injection needle is used, the sheath 70 is no longer under downward pressure. At this time, the sheath 70 springs upward under the force of the second spring 80. When the sheath 70 moves to the point where its blocking member 705 separates from the limiting guide groove 205 of the core 20, the core 20, under the force of the second spring 80, slides the core guide 204 along the inclined guide 105 of the needle seat 10 until the core guide 204 or the bottom surface 707 contacts the limiting plane 1011 of the needle seat 10. At this time, under the force of the second spring 80, the sheath 70 moves axially until the stepped surface 704 of the sheath 70 contacts the housing blocking surface 602 of the housing 60, as... Figure 23 As shown.

[0065] In this state, the upper surface 207 of the core 20 is lower than the top surface 607 of the cavity of the housing 60. When the sheath 70 is transparent, the change in the position of the core before and after use can be observed visually.

[0066] When the sheath 70 is pressed down again, when the end of the blocking member 705 of the sheath 70 contacts the sheath blocking surface 206 of the core 20, as... Figure 24 As shown, it can no longer be moved downwards. At this point, the needle 50 is below the sheath opening 701 of the sheath 70 and cannot be exposed, thus making it unusable for reuse.

[0067] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will understand that any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A disposable injection needle, comprising: A needle hub, wherein a needle tube is provided, the needle hub has a first end and a second end, and the needle tube passes through the needle hub; A core, the first end of which is adapted to be disposed at the first end of the needle hub, and the second end of which includes a core hole through which the first end of the needle tube extends; A protective portion is adapted to be disposed at the second end of the needle hub and provided with a protective portion hole for the second end of the needle tube to pass through. The protective portion includes an extension member that extends generally along the direction of the needle tube. The protective portion has a first axial position and a second axial position along the extension direction of the needle tube. In the first axial position, the second end of the needle tube is exposed from the protective portion hole. In the second axial position, the second end of the needle tube is not exposed from the protective portion hole. and A first spring, disposed between the needle seat and the protective portion, provides power for the protective portion to move from the first axial position toward the second axial position. in: The core has a first circumferential position and a second circumferential position. Before the injection needle is used, the core is in the first circumferential position that cooperates with the extension. After the injection needle is used, the core is in the second circumferential position that is disengaged from the extension. as well as Based on the core rotating from the first circumferential position to the second circumferential position, the protective part is adapted to move from the first axial position toward the second axial position under the action of the first spring; The needle holder has a partition, with a first end and a second end of the needle holder on opposite sides of the partition; and at a first axial position of the protective portion, the extension extends through the partition to engage with the core, and the extension is adapted to engage with the partition to define a second axial position of the protective portion.

2. The disposable injection needle according to claim 1, wherein, The second end of the needle holder is provided with a through groove, and the extended end of the extension member is adapted to pass through the through groove and engage with the core to keep the protective part in the first axial position.

3. The disposable injection needle according to claim 2, wherein, The protective portion includes a plurality of extensions, the plurality of extensions having the same height in the needle extension direction.

4. The disposable injection needle according to claim 2, wherein, The protective portion includes a plurality of extensions, the plurality of extensions having different heights in the needle extension direction.

5. The disposable injection needle according to any one of claims 2-4, wherein, The extension has an engaging portion that is adapted to move from one side of the partition to the other side of the partition, based on the movement of the protective portion from the first axial position toward the second axial position.

6. The disposable injection needle according to claim 2, wherein: The first end of the core is provided with a boss extending radially from the core, and the core has an extension mating part extending from the boss toward the second end of the core. as well as In the first circumferential position, the extended end of the extension engages with the mating portion of the extension, while in the second circumferential position, the extended end of the extension disengages from the mating portion of the extension.

7. The disposable injection needle according to claim 1, further comprising: A housing, the first end of which is connected to the second end of the needle hub, the second end of which has a housing opening; A sheath, the first end of which is located inside the housing, the second end of which has a sheath opening and extends out of the housing opening, and a portion of which is axially slidably located inside the housing; and A second spring, adapted to provide a spring force that causes the sheath to move axially outward from the housing, in: The sheath is adapted to retract toward the housing under external force, so that the needle is exposed through the opening in the sheath; The first end of the core is provided with a radially extending core guide portion, and the needle seat is provided with a guide mating portion. At the mounting position of the core and the needle seat, the core guide portion mates with the guide mating portion; and As the sheath moves toward the housing, the core guide moves along the guide engagement portion to guide the core to rotate in the circumferential direction from the first circumferential position to the second circumferential position, and is adapted to move to disengage from the guide engagement portion.

8. The disposable injection needle according to claim 7, wherein: The sheath has a minor diameter portion and a major diameter portion connected to each other in the axial direction, the minor diameter portion and the major diameter portion forming a stepped surface at the connection, wherein the minor diameter portion is adapted to extend from the housing opening to the outside of the sheath, and the distal end of the minor diameter portion has the sheath opening; The second end of the housing has a housing blocking surface that defines the opening of the housing; and The stepped surface is adapted to abut against the blocking surface of the housing, and the large-diameter portion is axially slidable within the housing.

9. The disposable injection needle according to claim 8, wherein: The inner wall of the sheath is provided with a blocking member extending in the axial direction; The outer wall of the core is provided with a limiting guide groove extending in the axial direction; and Based on the rotation of the core in the circumferential direction, the blocking member moves within the limiting guide groove.

10. The disposable injection needle according to claim 9, wherein: The limiting guide groove includes a first guide groove portion and a second guide groove portion disposed along the axial direction, wherein the dimension of the first guide groove portion in the circumferential direction is larger than the dimension of the second guide groove portion in the circumferential direction; as well as Based on the circumferential rotation of the core, the blocking member is adapted to rotate axially and circumferentially from the first guide groove to the second guide groove and be blocked in the second guide groove.

11. The disposable injection needle according to claim 10, wherein: The first guide groove portion has a guide surface at its end near the second guide groove portion; and The end of the blocking member is provided with a mating surface that mates with the guide surface.

12. The disposable injection needle according to any one of claims 9-11, wherein: The inner wall of the sheath is provided with a plurality of spaced-apart blocking members, and the outer wall of the core is provided with a plurality of spaced-apart limiting guide grooves; and Each of the plurality of blocking members moves within a corresponding limiting guide groove in the plurality of limiting guide grooves based on the circumferential rotation of the core.

13. The disposable injection needle according to claim 9, wherein, The limiting guide groove extends from its two sidewalls in the circumferential direction to near the core hole to form a sheath blocking surface.

14. The disposable injection needle according to claim 7, wherein: The needle hub has a partition, and the first end and the second end of the needle hub are respectively on both sides of the partition; The partition has a limiting plane, and the guiding mating part extends from the limiting plane along the axial direction toward the housing opening and is located at the edge of the limiting plane; After the circumferential rotation of the core is completed, the first end of the core abuts against the limiting plane to prevent further axial movement of the core; and The needle hub also has a core limiting part that connects with the guide mating part, the core limiting part being adapted to prevent the core from moving further circumferentially after completing the circumferential rotation.

15. The disposable injection needle according to claim 14, wherein: The first end of the core is provided with a boss extending radially from the core, the core guide extends radially from the edge of the boss toward the needle seat, and the guide mating part is provided on the radially outer side of the boss. The boss portion has a top surface and a bottom surface, and one end of the second spring abuts against the top surface of the boss; and After the circumferential rotation of the core is completed, the bottom surface of the boss or the core guide portion abuts against the limiting plane.

16. The disposable injection needle according to claim 15, wherein: The guiding mating part includes a planar guiding part and an inclined guiding part that extends obliquely from the planar guiding part to the limiting plane; At the mounting position of the core and the needle seat, the core guide portion mates with the planar guide portion; as well as As the sheath moves toward the housing, the core guide rotates from the planar guide to the inclined guide along the circumferential direction to guide the core to rotate in the circumferential direction, and the core guide is adapted to move to disengage from the inclined guide.

17. The disposable injection needle according to claim 14, wherein, The needle holder has multiple guiding mating parts, and the core limiting part is a core limiting groove between two adjacent guiding mating parts among the multiple guiding mating parts.

18. The disposable injection needle according to claim 14, wherein, The needle hub also includes: A sheath blocking portion is adjacent to the guide mating portion, and the height of the sheath blocking portion in the axial direction is greater than the height of the guide mating portion in the axial direction. The sheath blocking portion is adapted to prevent the sheath from moving toward the housing.

19. The disposable injection needle according to claim 14, wherein, The needle hub has a needle hub through hole at its center, through which the needle tube passes.

20. The disposable injection needle according to claim 7, wherein: The first end of the housing has a base, and the inner wall of the base is provided with transverse grooves arranged circumferentially. The second end of the needle holder has a transverse rib, which is radially arranged around the outer wall of the needle holder; and The transverse rib fits into the transverse groove.

21. The disposable injection needle according to claim 20, wherein: The second end of the needle holder also has a needle holder groove extending along the axial direction, the needle holder groove being located on the outer wall of the needle holder; and The inner wall of the base is also provided with a rib extending along the axial direction, the rib being adapted to fit into the needle seat groove.

22. The disposable injection needle according to claim 7, wherein: The first end of the sheath is provided with a sheath limiting groove, the sheath limiting groove being formed on the outer wall of the sheath; and The inner wall of the housing is provided with a limiting rib extending along the axial direction, and the limiting rib is adapted to fit into the limiting groove of the sheath.

23. The disposable injection needle according to claim 22, wherein, The sheath limiting groove includes a first limiting groove portion and a second limiting groove portion arranged along the axial direction. The first limiting groove portion has a triangular cross section, and the second limiting groove portion has a rectangular cross section.

24. The disposable injection needle according to claim 7, further comprising: The outer cover is externally fitted onto the needle hub, the core, the housing, the sheath, and the protective part.

25. The disposable injection needle according to claim 24, wherein a first anti-rotation structure is provided at the connection between the housing and the needle hub, and a second anti-rotation structure is provided at the connection between the outer cover and the housing.

26. The disposable injection needle according to claim 24, further comprising: A sealing sticker that covers the opening of the outer cover.

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