CN117244134A

CN117244134A - Disposable syringe needle

Info

Publication number: CN117244134A
Application number: CN202210657166.5A
Authority: CN
Inventors: 张立波
Original assignee: Tianjin Huahong Technology Co Ltd
Current assignee: Tianjin Huahong Technology Co Ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2023-12-19

Abstract

The present invention provides a disposable injection needle comprising: a needle seat, which is provided with a needle tube and through which the needle tube passes; the first end of the core body is arranged at the first end of the needle seat, and the second end of the core body comprises a core body hole through which the first end of the needle tube extends; the protection part is arranged at the second end of the needle seat and provided with a protection part hole for the second end of the needle tube to pass through, and the protection part comprises an extension piece extending along the direction of the needle tube; and a first spring. In the first axial position, the second end of the needle cannula is exposed from the guard aperture, and in the second axial position, the second end of the needle cannula is not exposed from the guard aperture. The core is in a first circumferential position engaging the extension member prior to use of the needle and is in a second circumferential position disengaged from the extension member after use of the needle. The disposable injection needle realizes the protection of the tail end of the injection needle, thereby avoiding the infection caused by the exposure of the needle point from the tail end of the injection needle to hurt people.

Description

Disposable syringe needle

Technical Field

The invention relates to the field of medical appliances, in particular to a disposable injection needle.

Background

Insulin injection needles have been widely used as a means for treating diabetes, and have a main function of controlling blood sugar of a patient by injecting insulin into the body of the diabetic patient.

The common injection needle matched with the insulin injection pen in the market at present is formed by combining a large sheath, a small sheath, a needle seat, a tubular needle and dialysis paper, the needle tip of the tubular needle is always exposed after the large sheath and the small sheath are removed, and the infection probability can be increased for some patients if the injection needle is used for the second time, or the used needle is easy to accidentally injure other people to cause cross infection.

In addition, most of the safety insulin needles on the market avoid secondary use, but only realize front end protection, cannot protect the rear end, and still have potential safety hazards. The product of both ends protection has been realized to current double-end, and the structure is too complicated and stability is poor.

Disclosure of Invention

In order to alleviate or solve at least one of the above problems, the present invention provides a disposable injection needle that achieves a rear end protection of the injection needle, thereby preventing a needle tip from exposing from a rear end of the injection needle to injure a person to cause infection, and is simple in structure and provides reliable stability.

According to an embodiment of the present invention, there is provided a disposable injection needle including: the needle stand is provided with a needle tube, the needle stand is provided with a first end and a second end, and the needle tube passes through the needle stand; the first end of the core body is suitable for being arranged at the first end of the needle seat, and the second end of the core body comprises a core body hole through which the first end of the needle tube extends; a protector portion adapted to be disposed at the second end of the needle mount and provided with a protector portion aperture through which the second end of the needle cannula passes, the protector portion including an extension member extending generally in the direction of the needle cannula, the protector portion having a first axial position in which the second end of the needle cannula is exposed from the protector portion aperture and a second axial position in which the second end of the needle cannula is not exposed from the protector portion aperture; and a first spring disposed between the hub and the guard to power movement of the guard from the first axial position toward the second axial position. The core body is provided with a first circumferential position and a second circumferential position, the core body is positioned at the first circumferential position matched with the extension piece before the injection needle is used, and the core body is positioned at the second circumferential position disengaged from the extension piece after the injection needle is used. The protection portion is adapted to move from the first axial position towards the second axial position under the action of the first spring, based on the rotation of the core from the first circumferential position to the second circumferential position.

Drawings

The above and other aspects and features of the present invention will become apparent from the following description of embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a disposable injection needle according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the disposable injection needle shown in FIG. 1;

fig. 3 and 4 are perspective views of a hub according to an embodiment of the present invention, respectively, from different perspectives;

fig. 5 and 6 are perspective views of a core according to an embodiment of the present invention, respectively, from different perspectives;

fig. 7 is a perspective view of a protecting part according to a first embodiment of the present invention;

fig. 8 is a front view of a protecting part according to a second embodiment of the present invention;

fig. 9 and 10 are perspective views of a protection part according to a third embodiment of the present invention, respectively, seen from different angles, wherein the extension piece has an engaging part;

fig. 11 and 12 are perspective views of a housing of a disposable injection needle according to an embodiment of the present invention, respectively, from different perspectives;

fig. 13 and 14 are perspective views of a sheath according to an embodiment of the present invention, respectively, from different perspectives;

fig. 15 is a schematic view of the assembly of the housing and sheath of the disposable injection needle according to an embodiment of the present invention;

fig. 16 is an assembled schematic view of the hub, core and protector in an initial assembled state according to an embodiment of the present invention;

FIG. 17 is a schematic view of the disposable needle in an initial assembled state with a portion of the housing and sheath removed, in accordance with an embodiment of the present invention;

fig. 18 is a cross-sectional view of the disposable injection needle in an initial assembled state according to an embodiment of the present invention;

FIG. 19 is a schematic view of the disposable injection needle during use with the sheath depressed and the first end of the needle cannula reaching the sheath opening and with a portion of the housing and sheath removed, in accordance with an embodiment of the invention;

FIG. 20 is a schematic view of the disposable needle during use shown in FIG. 19 with a portion of the housing, a portion of the sheath, and a second spring removed, in accordance with an embodiment of the invention;

FIG. 21 is a schematic view of a disposable injection needle in use with the needle cannula in the longest exposed state and with a portion removed to reveal internal structure, according to an embodiment of the present invention;

FIG. 22 is a cross-sectional view of a disposable injection needle in accordance with an embodiment of the present invention during use, with the needle cannula in the longest exposed state;

FIG. 23 is a schematic view of a disposable needle after use with a portion removed to reveal internal structure according to an embodiment of the present invention; and

fig. 24 is a schematic view showing a structure in which the disposable injection needle is subjected to a pressing external force again after use, with a portion removed to show an internal structure, according to an embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.

A disposable needle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings, it being noted that some features or components are not specifically shown in the drawings for clarity of illustration.

Referring to fig. 1, the disposable injection needle of the embodiment of the present invention includes a needle holder 10, a core 20, a protecting part 30, and a first spring 40. The needle hub 10 is provided with a needle cannula 50 having a first end 11 and a second end 12, and the needle cannula 50 passes through the needle hub 10. As shown in fig. 2 and 5, the core 20 has a first end 21 and a second end 22, the first end 21 being adapted to be disposed at the first end 11 of the hub 10 and the second end 22 including a core aperture 201 through which the first end 51 of the needle cannula 50 extends. Referring to fig. 2, 9 and 10, the guard 30 is adapted to be disposed at the second end 12 of the hub 10 and is provided with a guard aperture 301 through which the second end 52 of the needle cannula 50 passes, the guard 30 including an extension 302 extending generally in the direction of the needle cannula. The guard 30 has a first axial position in which the second end 52 of the needle cannula 50 is exposed from the guard aperture 301 (as shown in fig. 18), and a second axial position in which the second end 52 of the needle cannula 50 is not exposed from the guard aperture 301 (as shown in fig. 22), along the extension of the needle cannula. As shown in fig. 2, 18 and 22, a first spring 40 is provided between the needle mount 10 and the guard 30 to power the movement of the guard 30 from the first axial position toward the second axial position. Further, the core 20 has a first circumferential position and a second circumferential position. The core 20 is in a first circumferential position (as shown in fig. 16 and 17) engaged with the extension 302 prior to use of the injection needle, and the core 20 is in a second circumferential position (as shown in fig. 22) disengaged from the extension 302 after use of the injection needle. Based on the rotation of the core 20 from the first to the second circumferential position, the protection portion 30 is adapted to move from the first axial position towards the second axial position under the action of the first spring 40.

In an embodiment of the present invention, the guard 30 is disposed at the second end 12 of the hub 10 and is provided with a guard aperture 301 through which the second end 52 of the needle cannula 50 passes, and the guard 30 includes an extension 302 extending generally in the direction of the needle cannula. In the initial assembled state of the disposable injection needle, as shown for example in fig. 16-18, the guard 30 is disposed at the second end 12 of the hub 10 and the guard aperture 301 passes through the needle cannula 50. At this time, the protector 30 is in the first axial position where the second end 52 of the needle tube 50 is exposed from the protector hole 301, and the core 20 is in the first circumferential position where it engages with the extension 302. When the disposable needle is used, after an external force is applied to the disposable needle, the core 20 is rotated from a first circumferential position engaged with the extension 302 to a second circumferential position disengaged from the extension 302. Based on the rotation of the core 20 from the first circumferential position to the second circumferential position, the protection portion 30 is moved from the first axial position toward the second axial position by the first spring 40. When the core 20 is rotated to the second circumferential position, the core 20 is disengaged from the extension 302. At this time, the protecting portion 30 moves to the second axial position under the elastic force of the first spring 40 to cover the second end 52 (as shown in fig. 22) of the needle tube 50, thereby preventing the needle tube 50 from being exposed from the rear end of the injection needle to injure a person, resulting in infection.

Further, referring to fig. 3 and 4, the hub 10 has a septum 101, and the first end 11 and the second end 12 of the hub 10 are on either side of the septum 101, respectively. In the first axial position of the guard, the extension 302 extends past the spacer 101 to engage the core 20, as shown in fig. 16 and 18. In addition, the extension 302 is adapted to cooperate with the spacer 101 to define a second axial position of the guard 30. As shown in fig. 22, when the protecting portion 30 is located at the second axial position, the extending member 302 is in a fitted state with the partition 101.

As shown in fig. 3 and 4, in one embodiment, the second end 12 of the hub 10 is provided with a through slot 102, and the extension end 303 of the extension 302 is adapted to pass out of the through slot 102 to snap-fit with the core 20 to retain the guard 30 in the first axial position (as shown in fig. 16).

According to a first embodiment of the present invention, as shown in fig. 7, the protecting portion 30 includes a plurality of extension pieces 302. For example, two extensions 302 are illustratively shown in fig. 7 as being symmetrically disposed circumferentially. Upon rotation of the core 20 from the first circumferential position to the second circumferential position, the guard 30 is moved from the first axial position toward the second axial position by the first spring 40 to cover the second end 52 of the needle cannula 50 (as shown in fig. 22). When the extension piece engagement portion 203 is disengaged from the extension end portion 303, the guard portion 30 moves toward the trailing end under the influence of the first spring 40 to cover the second end 52 of the needle cannula 50. At this time, if the protector 30 is further pushed toward the trailing end, it will be deflected with respect to the axial direction to bring the second end (i.e., trailing end) 52 of the needle tube 50 into abutment against the inner wall of the protector 30, so that the protector hole 301 cannot be aligned. Accordingly, the second end 52 of the needle cannula 50 cannot be exposed from the guard aperture 301, thereby protecting the user from accidental sticks with the needle cannula. In the first embodiment shown in fig. 7, the plurality of extensions 302 have the same height in the direction of extension of the needle tube (i.e., the axial direction of the disposable injection needle). Alternatively, as shown in fig. 8, in the second embodiment, the plurality of extensions 302' may have different heights in the direction of extension of the needle tube (i.e., the axial direction of the disposable injection needle). Although 2 extensions are shown in fig. 7 and 8, this is merely illustrative, and the number of extensions may be selected to be greater as desired.

In a third embodiment of the invention, the extension 302 may have an engagement portion 304, as shown in fig. 9. Based on the movement of the protection portion 30 from the first axial position toward the second axial position, the engagement portion 304 is adapted to move from one side of the separator 101 (as shown in fig. 18) to the other side of the separator (as shown in fig. 22). In one embodiment, the extension 302 may be an elastic member. When the engaging portion 304 moves from one side of the spacer 101 toward the other side of the spacer 101, the engaging portion 304 abuts against the spacer 101 and continues to move toward the trailing end of the injection needle by the urging force of the first spring 40. Since the extension member 302 is a resilient member, the engagement portion 304 will move radially inwardly over the diaphragm 101 to the other side of the diaphragm. At this time, as shown in fig. 22, the bottom surface 305 of the protecting portion 30 is closer to the rear end of the injection needle than the second end 52 of the needle tube 50, and cannot be depressed because the partition 101 is located between the extending end 303 of the extending member 302 and the engaging portion 304, so that the second end 52 of the needle tube 50 cannot be exposed from the protecting portion hole 301, thereby protecting the user from accidental puncture by the needle tube. In addition, in the state shown in fig. 22, a transmission device such as a safety insulin needle cannot be connected again to the injection needle, and thus cannot be reused.

Referring to fig. 5 and 16, the first end 21 of the core 20 is provided with a boss portion 202 extending radially from the core, and the core 20 further has an extension piece mating portion 203 extending from the boss portion 202 toward the second end 22 of the core. In a first circumferential position of the core 20, the extension end 303 of the extension 302 engages the extension engagement portion 203, and in a second circumferential position of the core 20, the extension end 303 of the extension 302 disengages from the extension engagement portion 203.

Further, referring to fig. 1, the disposable injection needle may further include a housing 60, a sheath 70, and a second spring 80. As shown in fig. 2, 11 and 12, the first end 61 of the housing 60 is connected to the second end 12 of the hub 10 and the second end 62 of the housing 60 has a housing opening 601. As shown in fig. 2 and 13, the first end 71 of the sheath 70 is positioned 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 positioned within the housing 60. The second spring 80 is adapted to provide a spring force that moves the sheath 70 axially toward the housing outer axis. Sheath 70 is adapted to retract toward the interior of the housing against the spring force of second spring 80 based on an external force to expose needle cannula 50 through sheath opening 701 (as shown in fig. 22). As shown in fig. 3, 5 and 17, the first end 21 of the core 20 is provided with a radially extending core guide 204 and the hub 10 is provided with a guide mating portion. In the mounted position of the core 20 and the needle mount 10, the core guide 204 is engaged with the guide engaging portion, as shown in fig. 17. As shown in fig. 19-23, upon movement of the sheath 70 toward the housing 60, the core guide 204 moves along the guide mating portion to guide rotation of the core 20 in the circumferential direction from the first circumferential position to the second circumferential position and is adapted to move out of engagement with the guide mating portion.

In an embodiment of the present invention, the hub 10 of the disposable injection needle may be sleeved with the core 20, and the needle tube 50 axially extends 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, as shown in fig. 17 for example, the first end 71 of the sheath 70 is fitted over the core 20 and within the housing 60, the first end 61 of the housing 60 is connected to the second end 12 of the needle mount 10, and the second end 62 cooperates with the sheath 70. At this time, the core guide 204 of the core 20 is engaged with the guide engagement portion of the needle holder 10, and the protector 30 is in the first axial position exposing the second end 52 of the needle cannula 50 from the protector hole 301, and the core 20 is in the first circumferential position engaged with the extension 302. When the disposable injection needle is used, after an external force is applied to the disposable injection needle, the sheath 70 moves toward the needle holder 10 under the external force, i.e., retracts into the housing 60, and thus thrust is generated on the core 20. Under this pushing force, the core 20 rotates circumferentially, so that the core guide 204 moves along the guide engagement portion to guide the core 20 to rotate in the circumferential direction, and moves further to disengage from the guide engagement portion to move the sheath toward the outer axis of the housing under the elastic force of the spring, thereby covering the needle tube to avoid secondary use and increase the infection probability. During this process, the core 20 rotates from a first circumferential position in engagement with the extension 302 to a second circumferential position out of engagement with the extension 302. Based on the rotation of the core 20 from the first circumferential position to the second circumferential position, the protection portion 30 is moved from the first axial position toward the second axial position by the first spring 40. When the core 20 is rotated to the second circumferential position, the core 20 is disengaged from the extension 302. At this time, the protecting portion 30 moves to the second axial position under the elastic force of the first spring 40 to cover the second end 52 (as shown in fig. 22) of the needle tube 50, thereby preventing the needle tube 50 from being exposed from the rear end of the injection needle to injure a person, resulting in infection. Therefore, the disposable injection needle has the double-head protection function of the front end and the tail end, and has simple structure, stability and reliability.

Further, referring to fig. 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 step surface 704 at the connection. The small diameter portion 702 is adapted to extend out of the sheath 70 from the housing opening 601, and the distal end of the small diameter portion 702 has a sheath opening 701. In addition, as shown in fig. 11, the second end 62 of the housing 60 has a housing blocking surface 602 that defines a housing opening 601. The step surface 704 is adapted to be in abutting engagement with the housing stop surface 602 (as shown in fig. 2 and 17) and the large diameter portion 703 is axially slidably located within the housing 60.

As shown in fig. 5, 14 and 21, in one embodiment, the inner wall of the sheath 70 is provided with a stop 705 extending in the axial direction, and the outer wall of the core 20 is provided with a limit groove 205 extending in the axial direction (as shown in fig. 6). Based on the rotation of the core 20 in the circumferential direction, the stopper 705 moves within the restricting guide 205, as shown in fig. 19 and 21. Alternatively, the inner wall of the sheath 70 may be provided with a plurality of stoppers 705 spaced apart from each other (as shown in fig. 14), the outer wall of the core 20 is provided with a plurality of limit guides 205 spaced apart from each other, and each of the plurality of stoppers 705 moves within a corresponding one of the plurality of limit guides 205 based on the circumferential rotation of the core 20.

In the embodiment of the present invention, as shown in fig. 5, the restricting guide groove 205 may include a first guide groove portion 2051 and a second guide groove portion 2052 provided in the axial direction, the first guide groove portion having a larger dimension in the circumferential direction than the second guide groove portion. Based on the circumferential rotation of the core 20, the blocking member 705 is adapted to rotate axially and circumferentially from the first channel portion 2051 to the second channel portion 2052 and to be blocked in the second channel portion 2052, thereby preventing further rotation of the core, as shown in fig. 19-21. For example, when the core is rotated to engage the side walls of the stop 705 with the side walls of the limit channel 205, the core is prevented from further rotation.

Further alternatively, the end of the first channel portion 2051 adjacent to the second channel portion 2052 may be provided with a guide surface 2053, and the end of the blocking member 705 may be provided with a mating surface that mates with the guide surface 2053.

As shown in fig. 5, in the embodiment of the present invention, both side walls of the limit groove 205 in the circumferential direction extend to be close to the core hole 201 to form the 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 shown in fig. 23. Thus, after the injection needle of the present invention is used, for example, when the sheath is pressed down again, the end of the blocking member 705 of the sheath will abut against the sheath blocking surface 206 of the core 20, so that the second sheath cannot be compressed back into the housing for the second time to expose the needle tube, thereby avoiding cross infection caused by accidental injury of other people by the needle after use.

As shown in fig. 3, the bottom of the hub 10 may be provided with a septum 101, the first and second ends 11, 12 of which are on either side of the septum, respectively. The partition 101 has a limit plane 1011, and the guide engaging portion extends from the limit plane 1011 toward the housing opening 601 in the axial direction and is located at an edge of the limit plane 1011. After the circumferential rotation of the core 20 is completed, the first end 21 of the core abuts the limit plane 1011 to prevent further axial movement of the core. The needle mount 10 may also be provided with a core limiter 103 that interfaces with the guide mating portion, the core limiter 103 being adapted to prevent further circumferential movement of the core 20 after circumferential rotation is completed.

Further, as shown in fig. 5, the first end 21 of the core 20 is provided with a boss portion 202 extending radially from the core. The core guide 204 extends radially from the edge of the boss 202 toward the hub 10 (as shown in fig. 20), and the guide mating portion is provided radially outward of the boss 202 (as shown in fig. 17). 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 the boss top surface 2021. After the circumferential rotation of the core 20 is completed, the boss bottom surface 2022 or the core guide 204 abuts the limit plane 1011.

Further alternatively, referring to fig. 3, the guide-engaging portion of the needle mount 10 may include a planar guide portion 104 and a beveled guide portion 105 extending obliquely from the planar guide portion to the limit plane 1011. As shown in fig. 17, in the mounted position of the core 20 and the needle mount 10, the core guide 204 is mated with the planar guide 104. As shown in fig. 19 and 23, upon movement of the sheath 70 into the housing 60, the core guide 204 rotates in the circumferential direction from the planar guide 104 to the beveled guide 105 to guide the core to rotate in the circumferential direction, and the core guide 204 is adapted to move out of engagement with the beveled guide 105.

In one exemplary embodiment, the hub 10 may be provided with a plurality of guide mating portions 104,105, with the core limiter 103 being a core limiter slot between two adjacent ones of the plurality of guide mating portions, as shown in fig. 3.

As shown in fig. 3, the hub 10 may further include a sheath stop 106 that abuts the guide mating portion. The sheath blocking portion 106 has a height in the axial direction that is greater than the height of the guide engagement portion in the axial direction, and the sheath blocking portion 106 is adapted to prevent the sheath 70 from moving into the housing 60. In one embodiment, as shown in fig. 3, the center of the hub 10 is provided with a hub through hole 107 through which the needle cannula 40 passes.

Referring to fig. 11 and 12, the first end 61 of the housing 60 is provided with a seat 603, the inner wall of which is provided with a circumferential circumferentially arranged transverse groove 604. As shown in fig. 3, the second end 12 of the hub 10 is provided with a transverse bead 108 which is arranged radially around the outer wall of the hub. When the disposable needle is assembled, the transverse ribs 108 fit within the transverse grooves 604 to fix the axial position of the hub 10 and the housing 60.

With continued reference to fig. 3, the second end 12 of the hub 10 may also be provided with a hub catch 109 extending in the axial direction, said hub catch being located at the outer wall of said hub. As shown in fig. 11 and 15, the inner wall of the base 603 of the housing 60 may also be provided with ribs 605 extending in the axial direction adapted to fit in the hub catch groove 108 to prevent circumferential rotation of the hub 10 relative to the housing 60.

In an embodiment of the present invention, as shown in fig. 13, a first end of the sheath 70 may be provided with a sheath stop slot 706 formed on an outer wall of the sheath. The inner wall of the housing 60 is provided with a limit bead 606 extending in the axial direction, which is adapted to fit in the jacket limit groove, as shown in fig. 11, 12 and 15.

In an alternative embodiment, as shown in fig. 13, the sheath-stopper groove 706 may include a first stopper groove portion 7061 having a triangular cross section and a second stopper groove portion 7062 having a rectangular cross section, which are arranged along the axial direction. 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 that the limiting bead 606 is inserted into the sheath limiting groove 706, thereby making assembly of the sheath and the housing easier. It should be noted that the structure and shape of the jacket limiting slot are only exemplary and are not intended to be limiting.

In an alternative embodiment, as shown in fig. 1 and 2, the disposable injection needle may further comprise an outer cover 90 externally sheathing the needle hub 10, the core 20, the housing 60 and the sheath 70.

Alternatively, the connection between the housing 60 and the hub 10 may be provided with a first anti-rotation feature (e.g., a rib or protrusion, or an interference fit feature) and the connection between the outer cover 90 and the housing 60 is provided with a second anti-rotation feature (e.g., a anti-rotation rib or protrusion, or an interference fit feature).

Optionally, as shown in fig. 1 and 2, the disposable injection needle may further comprise a sealing patch 100 covering the opening of the outer cover 90. Before the disposable needle is used, it is necessary to tear the seal 100 and remove the outer cover 90 to remove the internal components, thereby further preventing the needle from being disabled by mishandling before it is used.

An assembling process of an injection needle according to an exemplary embodiment of the present invention will be described below with reference to the above-described structure.

First, the needle cannula 50 is inserted through the needle mount through-hole 107 of the needle mount 10, and may be fixed using, for example, an adhesive process. Needle hub 10 with needle cannula is then advanced from the bottom of core 20 and needle cannula 50 is passed through core bore 201 of the core. At this time, the core guide 204 of the core 20 contacts the planar guide 104 of the hub 10.

Next, the second spring 80 is sleeved outside 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 stopper 705 of the sheath 70.

The assembly of the above components is then placed into the housing 60 from the bottom thereof. The sheath 70 protrudes from the housing opening 601, and the hub catch 109 of the hub 10 cooperates with the rib 605 of the housing 60 to prevent the hub 10 from rotating circumferentially with the housing 60. The lateral ribs 108 of the hub 10 fit within the lateral slots 604 of the housing 60 to fix the axial position of the hub 10 with 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 to an initial assembly state, as shown in fig. 17.

The guard 30 is disposed at the second end 12 of the hub 10 and the guard aperture 301 extends through the needle cannula 50. At this time, the protector 30 is in the first axial position exposing the second end 52 of the needle cannula 50 from the protector aperture 301, and the core 20 is in the first circumferential position mated with the extension 302, as shown in the assembled initial state in fig. 18. The extension end 303 of the protecting portion 30 is inserted from the through groove 102 of the needle holder 10 to be engaged with the core 20 (e.g., engaged with the extension piece engaging portion 203). The first spring 40 is interposed between the protector 30 and the hub 10, with one end of the first spring 40 contacting the protector bottom surface 306 (as shown in fig. 10) of the protector 30 and the other end contacting the hub blocking surface 110 within the cavity of the hub 10.

The operation of the disposable injection needle according to the exemplary embodiment of the present invention will be described with reference to the above-described structure.

When the disposable injection needle is used, the sheath 70 moves toward the needle holder 10, i.e., toward the inside of the housing 60, by an external force. When the blocking member 705 of the sheath 70 contacts the guide surface 2053 of the core 20, the blocking member 705 may generate a pushing force against the guide surface 2053. Under this thrust force, the core 20 rotates circumferentially, and the core guide 204 of the core 20 and the planar guide 104 of the needle holder 10 are gradually separated from each other by the contact state until the core guide 204 and the planar guide 104 are no longer in contact, as shown in fig. 19. In this process, the extension piece engagement portion 203 of the core 20 is rotated circumferentially with respect to the extension end portion 303 of the protection portion 30.

After the core guide 204 of the core 20 is separated from the planar guide 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 105 of the needle holder 10. This causes the core 20 to move axially while rotating circumferentially, during which the sheath's blocking member 705 moves within the core 20's limit channel 205 until the core 20 rotates to such a degree that the blocking member 705's side walls engage the side walls of the limit channel 205, preventing further core rotation, as shown in fig. 21. As described above, due to the circumferential rotation of the core 20, the extension piece engagement portion 203 of the core 20 is circumferentially rotated with respect to the extension end portion 303 of the protection portion 30. When the extension piece engaging portion 203 is disengaged from the extension end portion 303, the protecting portion 30 moves toward the trailing end by the first spring 40 until the engaging portion 304 of the protecting portion 30 moves in the axial direction from one side of the septum 101 of the needle holder 10 over the septum 101 to the other side of the septum, with the septum 101 being located between the extension end portion 303 and the engaging portion 302 of the extension piece 302, as shown in fig. 22. During movement, when the engaging portion 304 contacts the partition 101, the extending member 302 of the protecting portion 30 is deformed to move radially inward until the engaging portion 304 moves to the other side of the partition beyond the partition 101, and then the extending member 302 of the protecting portion 30 returns to the original state. At this time, since the spacer 101 is located between the extending end 303 of the extension member 302 and the engaging portion 302, it cannot be pressed down, so that the second end (i.e., the trailing end) 52 of the needle cannula 50 cannot be exposed from the protecting portion hole 301, thereby protecting the user from accidental puncture by the needle cannula. In addition, in the state shown in fig. 22, a transmission device such as a safety insulin needle cannot be connected again to the injection needle, and thus cannot be reused.

During the movement of the sheath 70 toward the needle mount 10, the needle cannula 40 is exposed from the core aperture 201 of the sheath 70. Needle cannula 40 is exposed the longest when shield 70 is depressed such that its bottom surface 707 (shown in fig. 14) is in contact with shield stop 106 of hub 10 or core aperture 201 is below housing opening 601 of housing 60, as shown in fig. 22.

When the needle is in use, the sheath 70 is no longer under pressure. At this time, the sheath 70 is sprung up by the force of the second spring 80. When the sheath 70 is moved until the blocking piece 705 thereof is separated from the limit guide groove 205 of the core 20, the core 20 slides along the inclined surface guide portion 105 of the needle holder 10 by the force of the second spring 80 until the core guide portion 204 or the bottom surface 707 contacts the limit plane 1011 of the needle holder 10. At this time, the sheath 70 is axially moved by the force of the second spring 80 until the stepped surface 704 of the sheath 70 contacts the housing blocking surface 602 of the housing 60, as shown in fig. 23.

In this state, the upper plane 207 of the core 20 is lower than the cavity top end face 607 of the housing 60. When the sheath 70 is a transparent member, the change in the position of the core before and after use can be visually observed.

When the sheath 70 is depressed again, the end of the blocking piece 705 of the sheath 70 is in contact with the sheath blocking surface 206 of the core 20, as shown in fig. 24, and cannot move downward any more. At this time, the needle tube 50 is lower than the sheath opening 701 of the sheath 70 and cannot be exposed, and thus cannot be used for a second time.

The above description is given for the purpose of illustrating the embodiments of the present invention and is not to be construed as limiting the invention, but is to be construed as including any modifications, equivalent alterations, improvements, etc. which do not depart from the spirit and principles of the present invention.

Claims

1. A disposable injection needle comprising:

the needle stand is provided with a needle tube, the needle stand is provided with a first end and a second end, and the needle tube passes through the needle stand;

a core, the first end of the core being adapted to be disposed at the first end of the hub, the second end of the core including a core aperture through which the first end of the needle cannula extends;

a protector portion adapted to be disposed at the second end of the needle mount and provided with a protector portion aperture through which the second end of the needle cannula passes, the protector portion including an extension member extending generally in the direction of the needle cannula, the protector portion having a first axial position in which the second end of the needle cannula is exposed from the protector portion aperture and a second axial position in which the second end of the needle cannula is not exposed from the protector portion aperture; and

a first spring disposed between the hub and the guard to power movement of the guard from the first axial position toward the second axial position,

wherein:

the core body is provided with a first circumferential position and a second circumferential position, the core body is positioned at the first circumferential position matched with the extension piece before the injection needle is used, and the core body is positioned at the second circumferential position disengaged from the extension piece after the injection needle is used; and

the protection portion is adapted to move from the first axial position towards the second axial position under the action of the first spring, based on the rotation of the core from the first circumferential position to the second circumferential position.

2. The disposable injection needle of claim 1, wherein:

the needle seat is provided with a baffle plate, and the first end and the second end of the needle seat are respectively arranged at two sides of the baffle plate; and

in a first axial position of the guard, the extension extends past the bulkhead to engage the core, and the extension is adapted to engage the bulkhead to define a second axial position of the guard.

3. The disposable injection needle of claim 2, wherein the second end of the hub is provided with a through slot, and the extended end of the extension is adapted to pass out of the through slot to engage the core to retain the guard in the first axial position.

4. A disposable injection needle according to claim 3, wherein the protecting portion comprises a plurality of the extending members having the same height in the extending direction of the needle tube.

5. A disposable injection needle according to claim 3, wherein the protecting portion comprises a plurality of the extending members having different heights in the extending direction of the needle tube.

6. The disposable injection needle of any of claims 3-5, wherein the extension has an engagement portion adapted to move from one side of the septum to the other side of the septum based on the movement of the guard portion from the first axial position toward the second axial position.

7. A disposable injection needle according to claim 3, wherein:

a first end of the core is provided with a boss portion extending radially from the core, and the core has an extension piece mating portion extending from the boss portion toward a second end of the core; and

in the first circumferential position, the extension end of the extension piece is engaged with the extension piece engagement portion, and in the second circumferential position, the extension end of the extension piece is disengaged from the extension piece engagement portion.

8. The disposable injection needle of claim 1, further comprising:

a housing having a first end connected to a second end of the hub, the second end of the housing having a housing opening;

a sheath having a first end positioned within the housing and a second end having a sheath opening and extending from the housing opening, a portion of the sheath being axially slidably positioned within the housing; and

a second spring adapted to provide a spring force that moves the sheath axially toward the housing outer axis,

wherein:

the sheath is adapted to retract into the housing based on an external force to expose the needle cannula through the sheath opening;

the first end of the core body is provided with a core body guide part extending in the radial direction, the needle seat is provided with a guide matching part, and the core body guide part is matched with the guide matching part at the installation position of the core body and the needle seat; and

upon movement of the sheath toward the housing, the core guide moves along the guide engagement portion to guide rotation of the core in a circumferential direction from the first circumferential position to the second circumferential position and is adapted to move out of engagement with the guide engagement portion.

9. The disposable injection needle of claim 8, wherein:

the sheath has a small diameter portion and a large diameter portion connected to each other in an axial direction, the small diameter portion and the large diameter portion forming a stepped surface at the connection, wherein the small diameter portion is adapted to protrude from the housing opening to outside the sheath, a distal end of the small diameter portion having the sheath opening;

the second end of the housing having a housing blocking surface defining the housing opening; and

the step surface is suitable for being in abutting fit with the blocking surface of the shell, and the large-diameter part can be axially slidably positioned in the shell.

10. The disposable injection needle of claim 9, wherein:

the inner wall of the sheath is provided with a blocking member extending in the axial direction;

the outer wall of the core body is provided with a limiting guide groove extending in the axial direction; and

the blocking member moves within the limit guide groove based on rotation of the core in the circumferential direction.

11. The disposable injection needle of claim 10, wherein:

the limiting guide groove comprises a first guide groove part and a second guide groove part which are arranged along the axial direction, and the size of the first guide groove part in the circumferential direction is larger than that of the second guide groove part in the circumferential direction; and

the blocking member is adapted to rotate axially and circumferentially from the first guide groove portion to the second guide groove portion and to be blocked in the second guide groove portion based on circumferential rotation of the core.

12. The disposable injection needle of claim 11, wherein:

the end part of the first guide groove part, which is close to the second guide groove part, is provided with a guide surface; and

the end of the blocking piece is provided with a matching surface matched with the guide surface.

13. The disposable injection needle of any one of claims 10-12, wherein:

the inner wall of the sheath is provided with a plurality of blocking pieces which are spaced apart from each other, and the outer wall of the core is provided with a plurality of limit guide grooves which are spaced apart from each other; and

each of the plurality of stops moves within a corresponding one of the plurality of limit channels based on circumferential rotation of the core.

14. The disposable needle of claim 10, wherein two sidewalls of the limit channel in the circumferential direction extend to close to the core aperture to form a sheath blocking surface.

15. The disposable injection needle of claim 8, wherein:

the needle seat is provided with a baffle plate, and the first end and the second end of the needle seat are respectively arranged at two sides of the baffle plate;

the baffle plate is provided with a limit plane, and the guide matching part extends from the limit plane towards the shell opening along the axial direction and is positioned at the edge of the limit plane;

after the circumferential rotation of the core is completed, the first end of the core abuts against the limiting plane to prevent the core from further axial movement; and

the needle seat is also provided with a core limiting part connected with the guiding matching part, and the core limiting part is suitable for preventing the core from further circumferential movement after the circumferential rotation is completed.

16. The disposable injection needle of claim 15, wherein:

the first end of the core body is provided with a boss part extending radially from the core body, the core body guide part extends radially from the edge of the boss part towards the needle seat, and the guide matching part is arranged on the radial outer side of the boss part;

the boss part is provided with a boss top surface and a boss bottom surface, and one end of the second spring is abutted against the boss top surface; and

after the circumferential rotation of the core body is completed, the bottom surface of the boss or the core body guide part abuts against the limit plane.

17. The disposable injection needle of claim 16, wherein:

the guide matching part comprises a plane guide part and a slope guide part which obliquely extends from the plane guide part to the limit plane;

the core body guiding part is matched with the plane guiding part at the installation position of the core body and the needle seat; and

upon movement of the sheath toward the housing, the core guide rotates in the circumferential direction from the planar guide to the ramped guide to guide rotation of the core in the circumferential direction, and the core guide is adapted to move out of engagement with the ramped guide.

18. The disposable injection needle of claim 15, wherein the hub has a plurality of the guide mating portions, and the core limiter is a core limiter slot between two adjacent guide mating portions of the plurality of guide mating portions.

19. The disposable injection needle of claim 15, wherein the hub further comprises:

a sheath blocking portion, the sheath blocking portion being contiguous with the guide engagement portion and having a height in the axial direction that is greater than a height of the guide engagement portion in the axial direction, the sheath blocking portion being adapted to prevent movement of the sheath toward the housing.

20. The disposable injection needle according to claim 15, wherein a hub through hole through which the needle tube passes is provided at a center of the hub.

21. The disposable injection needle of claim 8, wherein:

the first end of the shell is provided with a base, and the inner wall of the base is provided with transverse grooves circumferentially arranged;

the second end of the needle seat is provided with a transverse convex rib, and the transverse convex rib is circumferentially arranged on the outer wall of the needle seat along the radial direction; and

the transverse ribs are matched in the transverse grooves.

22. The disposable injection needle of claim 21, wherein:

the second end of the needle seat is also provided with a needle seat clamping groove extending along the axial direction, and the needle seat clamping groove is positioned on the outer wall of the needle seat; and

the inner wall of the base is also provided with a convex rib extending along the axial direction, and the convex rib is suitable for being matched in the needle seat clamping groove.

23. The disposable injection needle of claim 1, wherein:

a first end of the sheath is provided with a sheath limiting groove which is formed in the outer wall of the sheath; and

the inner wall of the shell is provided with a limiting convex rib extending along the axial direction, and the limiting convex rib is suitable for being matched in the sheath limiting groove.

24. The disposable needle of claim 23, wherein the sheath retaining groove comprises a first retaining groove portion and a second retaining groove portion arranged along the axial direction, the first retaining groove portion having a triangular cross section, the second retaining groove portion having a rectangular cross section.

25. The disposable injection needle of claim 1, further comprising:

the outer cover is sleeved with the needle seat, the core body, the shell, the sheath and the protection part outside.

26. The disposable injection needle of claim 25, wherein a first anti-rotation structure is provided at a junction between the housing and the hub, and a second anti-rotation structure is provided at a junction between the outer cover and the housing.

27. The disposable injection needle of claim 25, further comprising:

and the sealing paste is used for covering the outer cover opening of the outer cover.