Disposable syringe needle
By designing the matching structure of the needle seat, sheath and inner core, the injection needle is automatically concealed and prevented from reuse, solving the infection and accidental injury caused by needle tip exposure, and improving safety and convenience.
Patent Information
- Application Number
- CN202410042962.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-11
- Publication Date
- 2025-07-11
AI Technical Summary
Existing injection needles are likely to cause the needle tip to be exposed after use, increasing the risk of infection and the possibility of accidental injury to others, and there is a hidden danger of reuse.
A disposable injection needle is designed, including a needle holder, a first sheath, a second sheath, an inner core and a spring. Through the design of the mating structure and elastic arm, the needle tube is automatically concealed and prevented from being reused.
It effectively avoids the risk of needle tip injury and infection, ensures that it cannot be reused after use, and improves safety and convenience.
Smart Images
Figure CN120285366A_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present disclosure relate to the field of medical devices, and in particular, to a disposable injection needle. Background Art
[0002] As a tool, the injection needle for an injection pen has been widely popularized and used. Its main function is to inject drugs into the body of patients to achieve the purpose of treatment.
[0003] Currently, the common injection needles on the market that cooperate with injection pens are composed of a large sheath, a small sheath, a needle seat, a tube needle, and dialysis paper. After removing the large sheath and the small sheath, the tip of the tube needle is always exposed. If some patients use it for the second time, the risk of infection will increase, or the used needle is likely to accidentally injure others and cause cross-infection. Summary of the Invention
[0004] To alleviate or solve at least one aspect or at least one point of the above problems, the present disclosure provides a disposable injection needle, which has a patient-end protection function, can avoid the needle tip from hurting people and the infection caused by repeated use, and is convenient and fast to use.
[0005] According to an embodiment of the present disclosure, a disposable injection needle is provided, including:
[0006] A needle seat, on which a needle tube axially extends through it;
[0007] A first sheath, one end of which is connected to one end of the needle seat to form an accommodation space between the first sheath and the needle seat, and the other end of the first sheath has a first opening;
[0008] A second sheath, one end of which is located in the accommodation space, the other end of which has a second opening and extends out from the first opening, and a part of the second sheath is axially slidably located in the accommodation space;
[0009] An inner core, the other end of which has a third opening, the needle tube axially extends through the third opening and is adapted to be exposed via the second opening; and
[0010] A spring;
[0011] Wherein:
[0012] The one end of the second sheath is sleeved and cooperated with the inner core, and is adapted to retract into the accommodation space against the elastic force of the spring based on an external force to expose the needle tube;
[0013] The spring is adapted to provide an elastic force for axially moving the second sheath and the inner core together towards the outside of the accommodation space;
[0014] The inner wall of the first sheath is provided with a first mating structure, and the second sheath is provided with a second mating structure that mates with the first mating structure;
[0015] Based on the movement of the second sheath into the accommodation space, the inner core rotates from a first circumferential position to a second circumferential position. At the second circumferential position, the inner core is adapted to be abutted by a spring and move in a direction away from the accommodation space to push the second sheath;
[0016] At the second circumferential position, the second mating structure is adapted to move past the first mating structure in a direction away from the accommodation space, and the first mating structure is adapted to prevent the second mating structure that has moved past the first mating structure from moving further in the direction towards the accommodation space. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is an exploded perspective view of a disposable injection needle according to an embodiment of the present disclosure;
[0018] Figure 2 is Figure 1 a schematic cross-sectional view of the disposable injection needle shown in ;
[0019] Figure 3 and Figure 4 are perspective views of the first sheath according to an embodiment of the present disclosure observed from different perspectives;
[0020] Figure 5 and Figure 6 are perspective views of the second sheath according to an embodiment of the present disclosure observed from different perspectives;
[0021] Figure 7 and Figure 8 are perspective views of the inner core according to an embodiment of the present disclosure observed from different perspectives;
[0022] Figure 9 is a perspective structural view of a needle base according to an embodiment of the present disclosure;
[0023] Figure 10 is an assembly schematic diagram of the first sheath and the second sheath according to an embodiment of the present disclosure;
[0024] Figure 11 is an assembly schematic diagram of the first sheath, the second sheath and the inner core according to an embodiment of the present disclosure;
[0025] Figure 12 and Figure 13 is an assembly schematic diagram of the inner core and the second sheath in an initial state according to an embodiment of the present disclosure, wherein, Figure 12 the inner core in is provided with a first protrusion,Figure 13 The inner core therein has no first protrusion;
[0026] Figure 14 It is a schematic assembly diagram of the inner core and the first sheath in an initial state according to an embodiment of the present disclosure;
[0027] Figure 15 It is a schematic assembly diagram of the inner core and the second sheath in a use state according to an embodiment of the present disclosure;
[0028] Figure 16 It is a schematic assembly diagram of the first sheath, the second sheath and the inner core in a use state according to an embodiment of the present disclosure;
[0029] Figure 17 It is a schematic cross-sectional view of a disposable injection needle in a use state according to an embodiment of the present disclosure;
[0030] Figure 18 and Figure 19 It is a schematic structural diagram of a disposable injection needle during use, where the needle tube is in the longest exposed state and a part is removed to show the internal structure;
[0031] Figures 20 to 23 It is a schematic structural diagram of a disposable injection needle in different states after use according to an embodiment of the present disclosure;
[0032] Figure 24 and Figure 25 It is a schematic structural position diagram between components when in an installation position according to an embodiment of the present disclosure;
[0033] Figure 26 and Figure 27 It is a schematic structural position diagram between components after the inner core rotates circumferentially according to an embodiment of the present disclosure;
[0034] Figure 28 and Figure 29 It is a schematic structural position diagram between components after being further pressed down to the bottom;
[0035] Figure 30 and Figure 31 It is a schematic structural position diagram between components after use according to an embodiment of the present disclosure.
[0036] In the figure:
[0037] 10. Second sheath;
[0038] 102. First guide block, 104. First guide groove, 1041. Second guide surface, 105. Elastic arm, 106. Sheath guiding portion, 107. Second opening, 108. Second step surface;
[0039] 20. First sheath
[0040] 201. First opening, 202. Second guide groove, 203. Wedge structure / convex structure, 204. Transverse groove, 205. Guide rib, 206. First guide surface, 207. Second end face, 208. First step surface, 209. Third guide groove
[0041] 30. Inner core
[0042] 302. Second guide block, 3021. Step mating surface, 3022. Guiding mating portion, 303. First concave surface, 304. Third opening, 305. First blocking surface, 306. First end face, 307. First protrusion
[0043] 40. Needle hub
[0044] 401. Needle hub hole, 402. Needle hub surface, 403. Transverse rib
[0045] 50. Spring
[0046] 60. Needle tube Detailed implementation manners
[0047] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art based on the present disclosure belong to the scope of protection of the present disclosure.
[0048] According to an exemplary embodiment of the present disclosure, as Figure 1 shown, a disposable injection needle includes a second sheath 10, a first sheath 20, an inner core 30, a needle hub 40, and a spring 50. The needle hub 40 is provided with a needle tube 60 axially extending therethrough.
[0049] As Figure 2 , Figure 3 and Figure 4 shown, one end of the first sheath 20 is connected to one end of the needle hub 40 to form an accommodation space R between the first sheath 20 and the needle hub 40, and the other end of the first sheath 20 has a first opening 201.
[0050] As Figure 2 , Figure 5 and Figure 6 shown, one end of the second sheath 10 is located in the accommodation space R, the other end of the second sheath 10 has a second opening 107 and extends out from the first opening 201, and a part of the second sheath 10 is axially slidable in the accommodation space R.
[0051] As shown in Figure 2 , Figure 7 and Figure 8 the inner core 30 is disposed within the accommodation space R, and the other end of the inner core 30 has a third opening 304. The syringe needle 60 axially extends through the third opening 304 and is adapted to be exposed via the second opening 107, as shown in Figure 18 and Figure 19 .
[0052] The spring 50 is adapted to provide an elastic force that causes the inner core 30 and the second sheath 10 to axially move together toward the outside of the accommodation space R. One end of the second sheath 10 is sleeved and fitted with the inner core 30, and is adapted to retract toward the inside of the accommodation space R against the elastic force of the spring 50 based on an external force to expose the syringe needle 60, as shown in Figure 18 and Figure 19 .
[0053] As shown in Figure 3 , Figure 11 and Figure 24 the inner wall of the first sheath 20 is provided with a first fitting structure 203; as shown in Figure 5 , Figure 11 and Figure 24 the second sheath 10 is provided with a second fitting structure 105 that fits with the first fitting structure 203.
[0054] Based on the movement of the second sheath 10 toward the inside of the accommodation space R, the inner core 30 rotates from a first circumferential position to a second circumferential position. At the second circumferential position, the inner core 30 is adapted to be abutted by the spring 50 and move in a direction away from the accommodation space R to push the second sheath 10.
[0055] As shown in Figure 20 and Figure 21 at the second circumferential position, the second fitting structure 105 is adapted to move past the first fitting structure 203 in a direction away from the accommodation space R, and the first fitting structure 203 is adapted to prevent the second fitting structure 105 that has moved past the first fitting structure 203 from further moving in the direction toward the inside of the accommodation space R.
[0056] The disposable injection needle provided by the present disclosure has a patient-end protection function, can avoid needle tip injury to people and infections caused by repeated use, and is convenient and fast to use.
[0057] The "upper", "lower", "inner", and "outer" described in the present disclosure are a schematic description. In the present disclosure, the direction in which the syringe needle 60 punctures or away from the accommodation space R is "upper", and the direction of moving toward the accommodation space R is "lower"; the wall surface of the first sheath / second sheath / needle core close to the central axis where the syringe needle is located is "inner", and the wall surface away from the central axis where the syringe needle is located is "outer".
[0058] In an alternative embodiment, the first mating structure is a radially inwardly protruding structure, and the second mating structure is an elastic arm.
[0059] In an alternative embodiment, the first mating structure satisfies the following: at a first circumferential position, it is disposed opposite to the second mating structure, and due to the clamping between the first mating structure and the outer wall of the inner core, the second mating structure cannot undergo elastic deformation; at a second circumferential position, after the second mating structure passes over the first mating structure, due to the blocking of the top of the first mating structure against the second mating structure, the second mating structure cannot move further into the accommodation space or cannot move further in the direction of the needle hub. That is, as long as the first mating structure can achieve the function of blocking the downward movement of the second mating structure, it falls within the scope of protection of the first mating structure of the present disclosure.
[0060] In an alternative embodiment, as Figure 3 and Figure 24 shown, the radially inwardly protruding structure is a wedge-shaped structure 203, and the wedge-shaped structure 203 is an inverted triangular pyramid structure, and its upper part is a flat surface or a stepped surface.
[0061] As Figure 5 and Figure 24 shown, the second mating structure is an elastic arm 105 provided on the second sheath 10.
[0062] As Figure 11 shown and Figure 24 shown, at the first circumferential position, the outer side surface of the elastic arm 105 is disposed opposite to the side surface of the wedge-shaped structure 203. At this time, the first sheath 20, the second sheath 10, and the inner core 30 are in an initial installation position, and they are closely fitted to each other. The elastic arm 105 is clamped between the wedge-shaped structure 203 of the first sheath 20 and the outer wall of the inner core 30, so that the elastic arm 105 has no space for radial deformation.
[0063] In an alternative embodiment, at the first circumferential position, the outer side surface of the elastic arm 105 may be in contact with or not in contact with the side surface of the wedge-shaped structure 203; the inner side surface of the elastic arm 105 is in contact with the outer side surface of the inner core 30, and at this time, the elastic arm 105 is in a natural extended state.
[0064] In an alternative embodiment, a radially outwardly extending guide block is provided on the outer wall of the second sheath 10, and a guide groove extending in the axial direction is provided on the inner wall of the first sheath 20. The guide block is adapted to move in the axial direction along the guide groove, so that the second sheath 10 can only move in the axial direction along the guide groove of the first sheath 20 and cannot rotate circumferentially. The guide block can be provided at any position in the circumferential direction of the first sheath 20. Correspondingly, the guide groove is provided at any position on the inner wall of the first sheath 20 that cooperates with the guide block.
[0065] As Figure 5 shown, in an alternative embodiment, the guiding block is a first guiding block 102 extending radially outward, and the first guiding block 102 is adapted to move axially along the guiding groove, and a guiding surface capable of blocking the first guiding block 102 from continuing to move upward along the guiding groove is provided at the upper end of the guiding groove. Since the upper end of the guiding groove has a guiding surface, this guiding surface can define the highest position for the first sheath 20 to move upward.
[0066] As Figure 4 shown, a guiding rib 205 extending in the axial direction is provided on the inner wall of the first sheath 20, and a second guiding groove 202 and a third guiding groove 209 extending in the axial direction are respectively provided on both sides of the guiding rib 205.
[0067] As Figure 6 shown, a sheath guiding portion 106 is provided at one end of the second sheath 10. Optionally, the sheath guiding portion 106 is the end face of one end of the second sheath 10.
[0068] As Figure 7 shown, a guiding and mating portion 3022 is provided at one end of the inner core 30. Optionally, a second guiding block 302 extending radially outward is provided at one end of the inner core 30, and the second guiding block 302 has a guiding and mating portion 3022.
[0069] At the installation position of the disposable injection needle of the present disclosure, the guiding and mating portion 3022 is the inclined surface on the upper part of the second guiding block 302.
[0070] Optionally, the sheath guiding portion 106 and the guiding and mating portion 3022 are inclined surfaces that cooperate with each other and have the same inclination angle.
[0071] As Figure 12 、 Figure 13 and Figure 25 shown, at the installation position of the second sheath 10 and the inner core 30, the sheath guiding portion 106 cooperates with the guiding and mating portion 3022 and is in a state of being in contact with each other.
[0072] As Figure 4 and Figure 25 shown, at this time, the second guiding block 302 is located in the second guiding groove 202. Since the side surface of the second guiding block 302 is blocked by the guiding rib 205, relative circumferential sliding between the sheath guiding portion 106 and the guiding and mating portion 3022 cannot occur.
[0073] Based on the pressing force of an external force on the second sheath 10, the second sheath 10 moves towards the inside of the accommodation space R, and the inner core 30 moves downward together with the second sheath 10 until the guiding cooperation portion 3022 reaches the end face position of the guiding rib 205. At this time, the second guiding block 302 is no longer blocked by the guiding rib 205 in the circumferential direction, so that the guiding cooperation portion 3022 can move along the sheath guiding portion 106 to guide the inner core 30 to rotate in the circumferential direction, and the guiding cooperation portion 3022 is adapted to move out of cooperation with the sheath guiding portion 106.
[0074] At this time, the second guiding block 302 passes over the guiding rib 205 and enters the third guiding groove 209.
[0075] In an alternative embodiment, the end of the guiding rib 205 has the same inclined surface as the sheath guiding portion 106 and the guiding cooperation portion 3022, so that the second guiding block 302 can smoothly slide relative to the end of the guiding rib 205 and pass over the guiding rib 205 to enter the third guiding groove 209.
[0076] In an alternative embodiment, the first guiding block 102 on the second sheath 10 can be arranged at any position in the circumferential direction of the second sheath 10. Correspondingly, on the first sheath 20, there is a guiding groove that defines the axial movement of the first guiding block 102.
[0077] In an alternative embodiment, as Figure 10 shown, if the guiding groove is the second guiding groove 202, the first guiding block 102 moves axially along the second guiding groove 202. At this time, as Figure 5 and Figure 6 shown, the first guiding block 102 is located outside the wall surface where the sheath guiding portion 106 is located, and the end of the first guiding block 102 has an inclined surface with the same inclination angle as the sheath guiding portion 106, so that the guiding cooperation portion 3022 can move along both the sheath guiding portion 106 and the end of the first guiding block 102. Then, the first guiding block 102 not only has the function of axially moving the second sheath 10 but also has the function of guiding the relative rotation of the guiding cooperation portion 3022.
[0078] As Figure 7 、 Figure 8 and Figure 24 shown, in an alternative embodiment, the inner core 30 has a first protrusion 307 extending radially outward. On the inner wall of the inner core 30, there is an annular rib, and the annular rib forms a first blocking surface 305. One end of the spring 50 abuts against the first blocking surface 305.
[0079] As Figure 4 、 Figure 24 and Figure 26 shown, the inner wall of the first sheath 20 has a first stepped surface 208.
[0080] As Figure 11 shown, Figure 14 and Figure 24 as shown, at the installation position of the first sheath 20 and the inner core 30, the first protrusion 307 is adapted to abut against the first stepped surface 208. At this time, without applying an external force, based on the elastic force of the spring 50, the first protrusion 307 abuts against the first stepped surface 208, and based on the blocking of the elastic arm 105 by the wedge-shaped structure 203, the second sheath and the inner core 30 are kept relatively stationary and stable.
[0081] As Figure 6 shown, one end of the second sheath 10 has a second stepped surface 108.
[0082] As Figure 15 shown, Figure 26 and Figure 27 as shown, based on the movement of the second sheath 10 towards the accommodation space R, the inner core 30 and the second sheath 10 move downward together. At this time, the first protrusion 307 disengages from the abutment with the first stepped surface 208. After reaching the end of the guiding rib 205, the guiding mating portion 3022 is guided to move along the sheath guiding portion 106, causing the inner core 30 to rotate. After the second sheath 10 continues to move downward, the first protrusion 307 abuts against the second stepped surface 108. After that, the second sheath 10 and the inner core 30 move downward together, as Figure 28 shown. After the external force is released, based on the elastic force of the spring, the two move upward together.
[0083] In an alternative embodiment, as Figure 13 shown, the first protrusion 307 is not provided on the inner core 30. At the initial installation position, under the action of the spring 50, the sheath guiding portion 106 is in contact and mating with the guiding mating portion 3022, the second guiding block 302 is in contact with the guiding rib 205 and is blocked by the guiding rib 205, and the elastic arm 105 is in abutting contact with the wedge-shaped structure 203, so that the first sheath 20, the second sheath 10 and the inner core 30 are kept relatively stationary.
[0084] As Figure 6 shown, the second sheath 10 is provided with a first guiding groove 104 extending in the axial direction, and the top end of the first guiding groove 104 has a second guiding surface 1041.
[0085] In an alternative embodiment, as Figure 7 shown, the second guiding block 302 has a stepped mating surface 3021 located at the top of the second guiding block 302. Optionally, the stepped mating surface 3021 may not be provided at the top of the second guiding block 302.
[0086] Based on the movement of the second sheath 10 towards the accommodation space R, the inner core 30 moves downward together with the second sheath 10 until the end face of the second guiding block 302 reaches the end face of the guiding rib 205. The guiding rib 205 releases the circumferential direction limitation on the second guiding block 302. After that, the guiding and mating portion 3022 slides relative to the sheath guiding portion 106, causing the inner core 30 to rotate circumferentially. The second guiding block 302 enters the first guiding groove 104 until the top end of the second guiding block 302 contacts the second guiding surface 1041 of the first guiding groove 104. After that, the second sheath 10 and the inner core 30 move downward together under the action of an external force. After the external force is removed, based on the elastic force of the spring, the second sheath 10 and the inner core 30 move upward together.
[0087] As Figure 7 and Figure 8 shown, the outer wall of the inner core 30 has a first concave surface 303, and the first concave surface 303 is a groove extending from the outer wall surface towards the inner wall surface.
[0088] As Figure 24 shown, at the initial installation position, that is, at the first circumferential position of the inner core 30, the wedge-shaped structure 203 of the first sheath 20, the elastic arm 105, and the outer wall surface of the inner core 30 are in mutual cooperation. The inner side surface of the elastic arm 105 contacts the outer wall surface of the inner core 30, and the outer side surface of the elastic arm 105 contacts the inner side surface of the wedge-shaped structure 203, so that the elastic arm 105 cannot undergo elastic deformation in the radial direction.
[0089] As Figure 20 、 Figure 21 and Figure 26 shown, after the inner core 30 rotates in the circumferential direction, the inner core 30 is in the second circumferential position. At this time, the first concave surface 303 rotates to a position opposite to the elastic arm 105 of the second sheath 10, that is, the first concave surface 303 is located on the side close to the needle tube 60 inside the elastic arm 105. At this time, the first concave surface 303 provides a space for the elastic arm 105 to elastically deform radially inward.
[0090] After the external force is removed, the second sheath 10 and the inner core 30 slide upward under the action of the spring 50. When the elastic arm 105 of the second sheath 10 contacts the wedge-shaped structure 203 of the first sheath 20, since the inner core 30 has rotated at this time, the first concave surface 303 of the inner core 30 and the elastic arm 105 are in the same radial direction. There is a space between the first concave surface 303 and the elastic arm 105 of the second sheath 10. Therefore, under the action of the spring force, the elastic arm 105 of the second sheath 10 deforms towards the central axis direction, and then slides over the wedge-shaped structure 203 of the first sheath 20; after sliding over the wedge-shaped structure 203, the elastic arm 105 of the second sheath 10 deforms in the opposite direction of the central axis and returns to its natural state.
[0091] Subsequently, the second sheath 10 and the inner core 30 continue to move outward from the accommodation space R under the action of the spring 50 until the top of the first guiding block 102 of the second sheath 10 contacts the top guiding surface of the guiding groove of the first sheath 20 and stops moving.
[0092] In an alternative embodiment, as Figure 22 、 Figure 23 and 31 shown, the second sheath 10 and the inner core 30 continue to move outward from the accommodation space R until the top of the first guiding block 102 contacts the first guiding surface 206 of the second guiding groove 202 of the first sheath 20 and stops moving.
[0093] Since at the second circumferential position, after the elastic arm 105 slides over the wedge-shaped structure 203, the bottom end of the elastic arm 105 can abut against the top surface of the wedge-shaped structure 203, such that if the second sheath 10 is pressed down again, the elastic arm 105 of the second sheath 10 is blocked by the wedge-shaped structure 203 and cannot be pressed down further, and the needle tube 60 cannot be exposed from the second opening 107 of the second sheath again. This enables the injection needle of the present disclosure not to be reused after use, avoiding the situation where the needle is likely to accidentally injure others and cause cross-infection.
[0094] In an alternative embodiment, as Figure 4 shown, one end of the first sheath 20 is provided with a base, and the inner wall of the base is provided with a circumferentially arranged transverse groove 204.
[0095] As Figure 9 shown, one end of the needle holder 40 is provided with a transverse rib 403, and the transverse rib 403 is circumferentially arranged on the outer wall of the needle holder 40. When the disposable injection needle is assembled, the transverse rib 403 is fitted in the transverse groove 204 to axially fix the needle holder 40 and the first sheath 20. The center of the needle holder 40 is further provided with a needle holder surface 402 and a needle holder hole 401 through which the needle tube 60 passes.
[0096] In an alternative embodiment, before the injection needle of the present disclosure is used, the first end surface 306 of the inner core 30 can be higher or lower than the second end surface 207 of the first sheath 20 in the axial direction; after use, the first end surface 306 of the inner core 30 can be higher or lower than the second end surface 207 of the first sheath 20 in the axial direction.
[0097] In an alternative embodiment, before use of the injection needle of the present disclosure, i.e., at the installation position of the first sheath 20 and the inner core 30, the height of the first end face 306 of the inner core 30 in the axial direction is lower than the height of the second end face 207 of the first sheath 20; after use of the injection needle, the height of the first end face 306 of the inner core 30 in the axial direction is higher than the height of the second end face 207 of the first sheath 20. When the second sheath 10 is made of a transparent or semi-transparent material, this difference can be used to distinguish whether the injection needle product of the present disclosure is before or after use.
[0098] With reference to the above structure, the operation process of the disposable injection needle according to an exemplary embodiment of the present disclosure will be described below.
[0099] First, as Figure 10 shown, the other end of the second sheath 10 is passed through the first opening 201 of the first sheath 20, and the first guiding block 102 of the second sheath 10 is engaged with the second guiding groove 202 of the first sheath 20, so that the second sheath 20 can only move axially relative to the first sheath 10 and cannot rotate circumferentially.
[0100] After that, as Figure 2 , Figure 11 , Figure 12 and Figure 14 shown, the inner core 30 is placed in the cavity of the second sheath 20, a spring 50 is placed in the inner core 30, and under the action of the spring 50, the guiding and mating portion 3022 of the inner core 30 contacts the sheath guiding portion 106 of the second sheath 10, and the first protrusion 307 of the inner core 30 contacts the first step surface 208 of the first sheath 20, as Figure 24 and Figure 25 shown.
[0101] At this time, as Figure 11 and Figure 24 shown, the wedge-shaped structure 203 of the first sheath 20 restricts the elastic arm 105 of the first sheath 10 from moving to the other end, so that the second sheath 10 is in a defined position. One end of the spring 50 contacts the first blocking surface 305 of the inner core 30, and the other end of the spring 50 contacts the socket surface 402 of the needle socket 40.
[0102] The needle tube 60 passes through the needle socket hole 401 and is fixed in the needle socket hole 401 by glue. The needle socket 40, the spring 50 and the needle tube 60 are assembled in the cavity of the first sheath 20, and the lateral ribs 403 of the needle socket 40 are engaged with the lateral grooves 204 of the first sheath 20, so that the needle socket 40 and the first sheath 20 are relatively fixed in position.
[0103] During use, as Figure 16 , Figure 17 and Figure 27As shown, the second sheath 10 moves towards the needle hub 40 under an external force until the second guiding block 302 disengages from the circumferential blockage of the guiding rib 205. Under the action of the spring 50, the guiding mating portion 3022 and the sheath guiding portion 106 of the second sheath 10 slide relative to each other, causing the inner core 30 to rotate circumferentially until the first protrusion 307 contacts the second step surface 108 of the second sheath 10, as Figure 26 shown, the first protrusion 307 of the inner core 30 disengages from the first step surface 208 of the first sheath 20 based on relative rotation and axial movement, and the first concave surface 303 of the inner core 30 rotates to the position of the elastic arm 105 of the second sheath 10.
[0104] Under an external force, the second sheath 10 continues to move towards the needle hub 40 until the second sheath 10 or the inner core 30 contacts the needle hub 40, and the second sheath 10 stops moving. During the axial movement of the second sheath 10, the needle tube 60 exposes from the second opening 107 of the second sheath 10, as Figure 18 、 Figure 19 、 Figure 28 and 29 shown.
[0105] After the external force is removed, as Figure 20 、 Figure 21 、 Figure 30 and Figure 31 shown, the second sheath 10 and the inner core 30 slide upward away from the needle hub 40 under the action of the spring 50. When the elastic arm 105 of the second sheath 10 contacts the wedge-shaped structure 203 of the first sheath 20, since the outer wall surface of the inner core 30 and the elastic arm 105 of the second sheath 10 are already misaligned, the first concave surface 303 is located at the relative position of the elastic arm 105 of the second sheath 10. At this time, since there is a space between the first concave surface 303 and the elastic arm 105 of the second sheath 10, under the action of the spring force, the elastic arm 105 of the second sheath 10 deforms towards the central axis direction and slides over the wedge-shaped structure 203 of the first sheath 20. After sliding over the wedge-shaped structure 203 of the first sheath 20, the elastic arm 105 of the second sheath 10 deforms in the opposite direction of the central axis and returns to its natural state.
[0106] As Figure 22 、 Figure 23 、 Figure 31 shown, the second sheath 10 and the inner core 30 continue to move under the action of the spring until they stop moving when the first guiding block 102 of the second sheath 10 contacts the first guiding surface 206 of the first sheath 20.
[0107] When the second sheath 10 is pressed down again, due to the interference between the elastic arm 105 of the second sheath 10 and the wedge-shaped structure 203 of the first sheath 20, that is, the top surface of the wedge-shaped structure 203 can abut against the bottom end of the elastic arm 105 to block the downward movement of the elastic arm 105, so it cannot be pressed down, as shown in Figure 20 , Figure 21 and Figure 30 shown. The syringe needle 60 cannot be exposed from the second opening 107 of the second sheath 10 again, so it cannot be reused.
[0108] Based on the above, the present disclosure proposes the following technical solutions:
[0109] 1. A disposable injection needle, comprising:
[0110] A needle hub, the needle hub is provided with a syringe needle axially extending therethrough;
[0111] A first sheath, one end of the first sheath is connected to one end of the needle hub to form an accommodation space between the first sheath and the needle hub, and the other end of the first sheath has a first opening;
[0112] A second sheath, one end of the second sheath is located in the accommodation space, the other end of the second sheath has a second opening and extends out from the first opening, and a part of the second sheath is axially slidably located in the accommodation space;
[0113] An inner core, the other end of the inner core has a third opening, the syringe needle axially extends through the third opening and is adapted to be exposed via the second opening; and
[0114] A spring;
[0115] Wherein:
[0116] One end of the second sheath is sleeved and cooperated with the inner core, and is adapted to retract into the accommodation space against the elastic force of the spring based on an external force to expose the syringe needle;
[0117] The spring is adapted to provide an elastic force for axially moving the second sheath and the inner core together toward the outside of the accommodation space;
[0118] The inner wall of the first sheath is provided with a first mating structure, and the second sheath is provided with a second mating structure that mates with the first mating structure;
[0119] Based on the movement of the second sheath into the accommodation space, the inner core rotates from a first circumferential position to a second circumferential position. In the second circumferential position, the inner core is adapted to be abutted by the spring and move in a direction away from the accommodation space to push the second sheath;
[0120] In the second circumferential position, the second mating structure is adapted to cross over the first mating structure in a direction away from the accommodation space, and the first mating structure is adapted to prevent the second mating structure that has crossed over the first mating structure from further moving in a direction towards the inside of the accommodation space.
[0121] 2. The disposable injection needle according to claim 1, wherein:
[0122] The first mating structure is a radially inwardly protruding structure, and the second mating structure is an elastic arm;
[0123] In the first circumferential position, the protruding structure is adapted to be disposed opposite to the elastic arm; in the second circumferential position, the end of the elastic arm is adapted to abut against the top of the protruding structure.
[0124] 3. The disposable injection needle according to claim 2, wherein:
[0125] The protruding structure is a wedge-shaped structure;
[0126] In the first circumferential position, the outer side surface of the elastic arm is adapted to be disposed opposite to the side surface of the wedge-shaped structure; in the second circumferential position, the end of the elastic arm is adapted to abut against the top surface of the wedge-shaped structure.
[0127] 4. The disposable injection needle according to claim 2 or 3, wherein:
[0128] The outer wall of the inner core has a first concave surface, and based on the rotation of the inner core in the circumferential direction, the first concave surface is adapted to be disposed opposite to the elastic arm to provide an elastic deformation space for the elastic arm.
[0129] 5. The disposable injection needle according to claim 1, wherein:
[0130] One end of the second sheath is provided with a sheath guiding portion, and one end of the inner core is provided with a guiding and mating portion. At the installation position of the second sheath and the inner core, the sheath guiding portion cooperates with the guiding and mating portion; and
[0131] Based on the movement of the second sheath towards the inside of the accommodation space, the guiding and mating portion is adapted to move along the sheath guiding portion to guide the inner core to rotate in the circumferential direction, and is adapted to move to be disengaged from the sheath guiding portion.
[0132] 6. The disposable injection needle according to claim 5, wherein:
[0133] The inner wall of the first sheath is provided with guiding ribs extending in the axial direction, and a second guide groove and a third guide groove extending in the axial direction are respectively provided on both sides of the guiding ribs;
[0134] A second guiding block extending radially outwards is provided on the inner core, and the second guiding block has the guiding and mating portion.
[0135] At the installation position of the second sheath and the inner core, the second guiding block is located in the second guiding groove; based on the movement of the second sheath towards the accommodation space and based on the rotation of the inner core in the circumferential direction, the second guiding block moves over the guiding rib and into the third guiding groove.
[0136] 7. The disposable injection needle according to claim 6, wherein:
[0137] A guiding groove extending in the axial direction is provided on the inner wall of the first sheath, and a guiding block extending radially outwards is provided on the outer wall of the second sheath;
[0138] The guiding block is adapted to move in the axial direction along the guiding groove.
[0139] 8. The disposable injection needle according to claim 7, wherein:
[0140] The guiding groove is the second guiding groove.
[0141] 9. The disposable injection needle according to claim 8, wherein:
[0142] The guiding block is the first guiding block, the first guiding block is located outside the wall surface where the sheath guiding portion is located, and the end of the first guiding block is a slope having the same inclination angle as the sheath guiding portion.
[0143] 10. The disposable injection needle according to claim 6, wherein:
[0144] The ends of the sheath guiding portion, the guiding and mating portion, and the guiding rib are slopes having the same inclination angle.
[0145] 11. The disposable injection needle according to claim 1, wherein:
[0146] A first protrusion extending radially outwards is provided on the inner core, and the inner wall of the first sheath has a first stepped surface;
[0147] At the installation position of the first sheath and the inner core, the first protrusion is adapted to abut against the first stepped surface.
[0148] 12. The disposable injection needle according to claim 11, wherein:
[0149] One end of the second sheath has a second stepped surface;
[0150] The inner core rotates in the circumferential direction, such that the first protrusion disengages from the abutment with the first stepped surface and abuts against the second stepped surface.
[0151] 13. The disposable injection needle according to claim 1, wherein:
[0152] The second sheath is provided with a first guide groove extending in the axial direction, and based on the rotation of the inner core in the circumferential direction, the guiding and mating portion is adapted to enter into the first guide groove.
[0153] 14. The disposable injection needle according to claim 13, wherein:
[0154] The inner core is provided with a second guiding block extending radially outwards, and the second guiding block has the guiding and mating portion;
[0155] The end of the first guide groove has a second guiding surface;
[0156] Based on the rotation of the inner core in the circumferential direction, the second guiding block is adapted to enter into the first guide groove until the second guiding block abuts against the second guiding surface.
[0157] 15. The disposable injection needle according to claim 1, wherein:
[0158] The inner wall of the inner core has an annular rib, and the annular rib forms a first blocking surface, and one end of the spring abuts against the first blocking surface.
[0159] 16. The disposable injection needle according to claim 1, wherein:
[0160] At the installation position of the first sheath and the inner core, the height of the first end surface of the inner core in the axial direction is lower than the second end surface of the first sheath;
[0161] After the injection needle is used, the height of the first end surface of the inner core in the axial direction is higher than the second end surface of the first sheath.
[0162] 17. The disposable injection needle according to claim 1, wherein:
[0163] One end of the first sheath is provided with a base, and the inner wall of the base is provided with a transverse groove arranged circumferentially;
[0164] One end of the needle hub is provided with a transverse rib, and the transverse rib is arranged circumferentially around the outer wall of the needle hub; and the transverse rib is fitted in the transverse groove.
[0165] It should be noted that the above technical solutions can be combined arbitrarily under logical circumstances, and all are within the protection scope of the present disclosure. In this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.
[0166] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.
[0167] Although the embodiments of the present disclosure have been shown and described, for those of ordinary skill in the art, it can be understood that these embodiments can be varied and element combined without departing from the principle and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims and their equivalents.
Claims
1. A disposable injection needle, comprising: A needle hub, wherein a needle tube axially extends through the needle hub; A first sheath, one end of the first sheath is connected to one end of the needle hub to form a receiving space between the first sheath and the needle hub, and the other end of the first sheath has a first opening; A second sheath, one end of the second sheath is located within the receiving space, the other end of the second sheath has a second opening and extends out from the first opening, and a part of the second sheath is axially slidably located within the receiving space; An inner core, the other end of the inner core has a third opening, the needle tube axially extends through the third opening and is adapted to be exposed via the second opening; And A spring; Wherein: One end of the second sheath is sleeved and cooperated with the inner core, and is adapted to retract into the receiving space against the elastic force of the spring based on an external force to expose the needle tube; The spring is adapted to provide an elastic force for axially moving the second sheath and the inner core together towards the outside of the receiving space; A first fitting structure is provided on the inner wall of the first sheath, and a second fitting structure adapted to cooperate with the first fitting structure is provided on the second sheath; Based on the movement of the second sheath towards the inside of the receiving space, the inner core rotates from a first circumferential position to a second circumferential position. At the second circumferential position, the inner core is adapted to be abutted by the spring and move in a direction away from the receiving space to push the second sheath; At the second circumferential position, the second fitting structure is adapted to move past the first fitting structure in a direction away from the receiving space, and the first fitting structure is adapted to prevent the second fitting structure that has moved past the first fitting structure from further moving in a direction towards the inside of the receiving space.
2. The disposable injection needle according to claim 1, wherein: The first fitting structure is a radially inwardly protruding structure, and the second fitting structure is an elastic arm; At the first circumferential position, the protruding structure is adapted to be disposed opposite to the elastic arm; at the second circumferential position, the end of the elastic arm is adapted to abut against the top of the protruding structure.
3. The disposable injection needle according to claim 2, wherein: The protruding structure is a wedge-shaped structure; At the first circumferential position, the outer side surface of the elastic arm is adapted to be disposed opposite to the side surface of the wedge-shaped structure; at the second circumferential position, the end of the elastic arm is adapted to abut against the top surface of the wedge-shaped structure.
4. The disposable injection needle according to claim 2 or 3, wherein: The outer wall of the inner core has a first concave surface, and based on the rotation of the inner core in the circumferential direction, the first concave surface is adapted to be disposed opposite to the elastic arm to provide an elastic deformation space for the elastic arm.
5. The disposable injection needle according to claim 1, wherein: One end of the second sheath is provided with a sheath guiding portion, and one end of the inner core is provided with a guiding and cooperating portion. At the installation position of the second sheath and the inner core, the sheath guiding portion cooperates with the guiding and cooperating portion; And Based on the movement of the second sheath towards the interior of the accommodation space, the guiding and mating portion is adapted to move along the sheath guiding portion to guide the inner core to rotate in the circumferential direction and is adapted to move out of engagement with the sheath guiding portion.
6. The disposable injection needle according to claim 5, wherein: The inner wall of the first sheath is provided with guiding ribs extending in the axial direction, and a second guiding groove and a third guiding groove extending in the axial direction are respectively provided on both sides of the guiding ribs; The inner core is provided with a second guiding block extending radially outwards, and the second guiding block has the guiding and mating portion; At the installation position of the second sheath and the inner core, the second guiding block is located in the second guiding groove; Based on the movement of the second sheath towards the interior of the accommodation space and based on the rotation of the inner core in the circumferential direction, the second guiding block crosses the guiding rib and enters the third guiding groove.
7. The disposable injection needle according to claim 6, wherein: The inner wall of the first sheath is provided with a guiding groove extending in the axial direction, and the outer wall of the second sheath is provided with a guiding block extending radially outwards; The guiding block is adapted to move in the axial direction along the guiding groove.
8. The disposable injection needle according to claim 7, wherein: The guiding groove is the second guiding groove.
9. The disposable injection needle according to claim 8, wherein: The guiding block is the first guiding block, the first guiding block is located outside the wall surface where the sheath guiding portion is located, and the end of the first guiding block is a slope having the same inclination angle as the sheath guiding portion.
10. The disposable injection needle according to claim 6, wherein: The end portions of the sheath guiding portion, the guiding and mating portion, and the guiding rib are slopes having the same inclination angle.
11. The disposable injection needle according to claim 1, wherein: The inner core is provided with a first protrusion extending radially outwards, and the inner wall of the first sheath has a first stepped surface; At the installation position of the first sheath and the inner core, the first protrusion is adapted to abut against the first stepped surface.
12. The disposable injection needle according to claim 11, wherein: One end of the second sheath has a second stepped surface; The inner core rotates in the circumferential direction such that the first protrusion disengages from abutting against the first stepped surface and abuts against the second stepped surface.
13. The disposable injection needle according to claim 1, wherein: The second sheath is provided with a first guiding groove extending in the axial direction, and based on the rotation of the inner core in the circumferential direction, the guiding and mating portion is adapted to enter the first guiding groove.
14. The disposable injection needle according to claim 13, wherein: The inner core is provided with a second guiding block extending radially outwards, and the second guiding block has the guiding and mating portion; The end of the first guiding groove has a second guiding surface; Based on the rotation of the inner core in the circumferential direction, the second guiding block is adapted to enter the first guiding groove until the second guiding block abuts against the second guiding surface.
15. The disposable injection needle according to claim 1, wherein: An annular rib is provided on the inner wall of the inner core, the annular rib forms a first blocking surface, and one end of the spring abuts against the first blocking surface.
16. The disposable injection needle according to claim 1, wherein: At the installation position of the first sheath and the inner core, the height of the first end face of the inner core in the axial direction is lower than the height of the second end face of the first sheath; After the injection needle is used, the height of the first end face of the inner core in the axial direction is higher than the height of the second end face of the first sheath.
17. The disposable injection needle according to claim 1, wherein: A base is provided at one end of the first sheath, and a transverse groove arranged circumferentially is provided on the inner wall of the base; A transverse rib is provided at one end of the needle base, the transverse rib is arranged radially around the outer wall of the needle base; and the transverse rib is fitted in the transverse groove.