Needle for injection pen

Abstract

The utility model provides a needle head for an injection pen. The needle head for the injection pen comprises a needle seat, a needle tube, a clamping seat and a needle tip sheath. More than two sliding blocks are arranged on the inner surface of the needle tip sheath, each sliding block comprises a first bulge and a second bulge, and the sides, facing the needle tube, of the first bulges and the second bulges abut against the clamping seat. The stability of the needle tip sheath during axial movement is improved, so that the axial movement of the needle tip sheath is not easy to shake or deflect, and the needle tube is prevented from easily deflecting after penetrating into the skin of a patient.

Description

Technical Field

[0001] The utility model relates to the technical field of syringes, in particular to a needle for an injection pen. Background Art

[0002] In the prior art, as a method of treating diabetes, a certain amount of insulin needs to be injected into the patient. In order to achieve the above effect, a needle tube similar to a pen-type syringe is usually used. The needle tube is a disposable needle with a safety protection device. The needle tube is used to inject liquid medicine into the body. Correct selection and use of the needle tube can ensure accurate injection of the medicine or accurate collection of the sample, and can also avoid discomfort or complications during the injection process. The structure of the needle tube usually includes the following main parts:

[0003] Needle tip: The needle tip is the front, usually sharp, end of the needle that is used to penetrate skin and tissue. Needle tips come in different shapes and sizes to suit different injection purposes.

[0004] Needle tube: The needle tube is the part connecting the needle tip and the needle base, usually a hollow tubular structure. Liquid drugs or samples can flow in or out through the needle tube.

[0005] Needle holder: The needle holder is usually a cylindrical container made of transparent plastic or glass, which is used to hold liquid drugs such as insulin. The needle holder is also used to fix the needle tube, allowing the user to inject the drug into the patient's body by holding the needle holder.

[0006] Needle tip shield: Before the needle tube injects liquid drugs such as insulin into the patient's body, the needle tip shield can prevent the needle tip from being contaminated and prevent the sharp needle tip from causing harm to the user. At the same time, the needle tip shield needs to be set to a detachable or movable structure so that the needle tip can be smoothly exposed when the needle tube is in use. After the needle tube injects liquid drugs such as insulin into the patient's body, the disposable needle tube will be abandoned. In order to prevent the sharp needle tip of the needle tube from causing secondary harm to the user or others after being abandoned, it is necessary to use a needle tip shield to protect the needle tip again.

[0007] The needle tip sheath of the needle tube in the prior art has the following technical problems:

[0008] The technical problem that the needle tip shield is prone to shaking during use, in the process of using the needle tube, it is necessary to use the support force of the patient's body on the needle tip shield to make the needle tip shield move axially. The needle tip shield in the prior art fails to generate a mutual force with the holder, so that the axial movement of the needle tip shield will shake or deflect, which makes the needle tube easily deflect after piercing the patient's skin, which easily increases the risk of injection errors.

[0009] Technical problem of needle tip sheath falling off naturally: During transportation, the needle tube will collide due to the vibration of the vehicle body, causing the needle tip sheath to fall off naturally, exposing the needle tip of the needle tube in advance. Or under the influence of natural gravity, the needle tip sheath will naturally slide down due to its own gravity, exposing the needle tip of the needle tube in advance. The premature exposure of the needle tip of the needle tube will cause damage to the needle tube, and it is easy to cause liquid drug leakage and cause pollution.

[0010] The technical problem of the needle tip shield being difficult to reset: After the needle tube is used, the user needs to reset the needle tip shield to prevent the sharp needle tip of the needle tube from causing secondary harm to the user or other people after it is abandoned. The prior art uses a spring structure to reset the needle tip shield. When the needle tip shield is pressed down by pressure, the spring structure stores elastic potential energy, and releases the elastic potential energy to reset the needle tip shield after the needle tube is used. This spring structure easily causes the needle tip shield to fail to return to its initial position, resulting in the needle tip still being exposed, causing the sharp needle tip of the needle tube to cause secondary harm to the user or other people after it is abandoned. The prior art has a needle tube that relies on the user to manually reset the needle tip shield. This needle tube relies on the user to reset the needle tip shield by observing with the naked eye whether the needle tip is in an exposed state. Since there is no prompt on whether the needle tip shield is accurately reset, it is difficult to avoid the situation where the user resets the needle tip shield but fails to do so due to operational errors. Utility Model Content

[0011] The utility model aims to provide a needle for an injection pen, so as to solve the technical problem that the needle tip sheath of the prior art syringe is easy to shake, thereby causing the needle tube to be easily deflected during use.

[0012] In order to solve the above problems, the utility model provides a needle for an injection pen, which comprises a needle seat, a needle tube, a holder and a needle tip sheath. The needle tube is fixedly mounted to the needle seat; the holder is tubular and engaged with the needle seat, and a first groove is provided on the outer surface of the holder; the needle tip sheath is tubular, and two or more sliders are provided on the inner surface of the needle tip sheath, each of which can be slidably mounted to the needle seat; each slider is provided with a protrusion on the outer surface of the holder facing the protrusion, and each protrusion is engaged with the first groove.

[0013] Furthermore, the needle seat includes a base, a needle tube sleeve and more than two clamping columns. The needle tube sleeve is arranged at the top of the base, and the needle tube sleeve is provided with a first through hole, and the first through hole extends from the top of the needle tube sleeve to the bottom of the needle tube sleeve; the first through hole is used to install the needle tube, so that the needle tube passes through the first through hole and extends to the inside of the base. Each clamping column is arranged at the top of the base, and a plurality of clamping columns are arranged around the needle tube sleeve, so that there is a gap between each clamping column and the needle tube sleeve; the gap is used to install the clamping seat, so that the clamping seat is clamped to the needle seat; a slide groove is formed between each clamping column and another adjacent clamping column, and each slide groove is used to install a slider, so that each slider can be slidably installed to a slide groove.

[0014] Furthermore, a protrusion is provided on one side of the top of each clamping column; the inner surface of the needle tip shield is provided with more than two ratchets, each ratchet is located between two adjacent sliders, each ratchet separates the two adjacent sliders into a first groove and a second groove, and each ratchet protrudes from the inner surface of the needle tip shield and extends in a direction away from the first groove.

[0015] Furthermore, when each sliding block slides in a sliding groove, the protruding portion of each clamping column slides in a first groove.

[0016] Furthermore, when each protrusion is engaged with the first groove, the needle tip shield can rotate, so that the protrusion of each clamping column rotates to a second groove and engages with each other on the ratchet teeth so that it cannot rotate in the opposite direction; at the same time, each slider abuts against a side of the top of a clamping column where no protrusion is provided, so that each slider cannot slide in the vertical direction.

[0017] Furthermore, the slider includes a first protrusion, a second protrusion and a connecting plate. The first protrusion protrudes from the inner surface of the needle tip sheath; the second protrusion protrudes from the inner surface of the needle tip sheath; one end of the connecting plate is connected to the first protrusion, and the other end of the connecting plate is connected to the second protrusion; the connecting plate is used to install the protrusion, so that the protrusion protrudes from the surface of the connecting plate and is engaged with the first groove.

[0018] Furthermore, the first protrusion abuts against the holder on the side facing the needle tube; and the second protrusion abuts against the holder on the side facing the needle tube.

[0019] Furthermore, a first annular boss is provided on the outer surface of the needle tip shield, and the first annular boss protrudes from the top of the outer surface of the needle tip shield; a second annular boss is provided on the outer surface of the needle tip shield, and the second annular boss protrudes from the bottom of the outer surface of the needle tip shield.

[0020] Furthermore, the needle tip shield is fixedly connected to the sleeve via two or more connecting arms, and each connecting arm can be slidably mounted to the needle seat.

[0021] Furthermore, the needle for the injection pen further comprises a needle seat sheath and dialysis paper. The needle seat sheath is arranged on the outer surface of the needle seat; and the dialysis paper is sealed and connected to the bottom of the needle seat.

[0022] The utility model has the advantages of providing a needle for an injection pen, wherein the inner surface of the needle tip shield is provided with two or more sliders, the sliders include a first protrusion and a second protrusion, and the first protrusion and the second protrusion abut against the holder on one side of the needle tube, thereby increasing the stability of the needle tip shield during axial movement, making it difficult for the needle tip shield to shake or deflect during axial movement, thereby preventing the needle tube from easily deflecting after piercing the patient's skin.

[0023] The outer surface of the holder of the injection pen needle is provided with a first groove. The inner surface of the needle tip shield is provided with more than two sliders, each slider is provided with a protrusion facing the outer surface of the holder, and each protrusion is engaged with the first groove. The interaction force between the protrusion and the groove can prevent the needle tip shield from sliding down due to vibration during transportation or natural gravity, thereby preventing the needle tip from being exposed. When the user uses the injection pen needle of the utility model, only a certain pressure is applied to the needle tip shield to separate the protrusion and the groove from each other, so that the injection pen needle can be used normally.

[0024] After using the needle for the injection pen, the user pulls out the needle tip shield to reset it. When the user successfully restores the needle tip shield to its original position, the bump and the groove will re-engage each other. The special touch produced by the engagement of the bump and the groove will serve as a reminder of whether the needle tip shield is accurately reset, thereby preventing the user from resetting the needle tip shield incompletely due to operational errors. This prevents the needle tip from being exposed, thereby preventing the sharp needle tip of the needle tube from causing secondary harm to the user or others after being abandoned. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the needle for the injection pen in Example 1;

[0026] Figure 2 It is a schematic diagram of a part of the structure of the needle for the injection pen in Example 1;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the needle for the injection pen in Example 1;

[0028] Figure 4 is a longitudinal cross-sectional view of the needle for the injection pen in Example 1;

[0029] Figure 5 This is a schematic diagram of the overall structure of the needle tip sheath in Example 1;

[0030] Figure 6 This is a schematic diagram of the overall structure of the card holder in Example 1;

[0031] Figure 7 It is a schematic diagram of the overall structure of the needle seat in Example 1;

[0032] Figure 8 The overall structure of the needle holder and the needle tube in Example 1 is shown in FIG. Figure 1 ;

[0033] Fig. 9 The overall structure of the needle holder and the needle tube in Example 1 is shown in FIG. Figure 2 ;

[0034] Fig.10 Schematic diagram of the internal structure of the needle tip sheath in Example 1;

[0035] Fig.11 This is a schematic diagram of the structure of the injection pen needle in Example 1 when it is not in use;

[0036] Fig.12 This is a schematic diagram of the structure of the injection pen needle after being used in Example 1;

[0037] Fig.13 This is a schematic diagram of the overall structure of the injection pen needle after being rotationally locked in Example 1;

[0038] Fig.14 is a schematic diagram of the overall structure of the slider in Example 1;

[0039] Fig.15 This is a schematic structural diagram of the outer surface of the needle tip sheath in Example 1;

[0040] Fig.16 This is a schematic diagram of the overall structure of the injection pen needle with a needle seat sheath and dialysis paper in Example 1;

[0041] Fig.17 This is a schematic diagram of the overall structure of the needle tip sheath in Example 2;

[0042] Fig.18 The overall structure diagram of the needle tip sheath in Example 3 is shown in FIG.

[0043] The numbers in the figure are as follows:

[0044] 1 needle holder, 2 needle tube, 3 card holder, 4 needle tip sheath, 5 needle holder sheath,

[0045] 6 dialysis papers,

[0046] 11 base, 12 needle tube sleeve, 13 clamping column, 31 groove, 41 slider, 42 ratchet,

[0047] 43 first annular boss, 44 second annular boss, 45 connecting arm,

[0048] 121 first through hole, 131 gap, 132 protrusion, 411 first protrusion,

[0049] 412 is a second protrusion, 413 is a connecting plate, 414 is a convex block, 421 is a first groove, and 422 is a second groove. DETAILED DESCRIPTION

[0050] The following describes the preferred embodiments of the present invention with reference to the drawings in the specification, which are used to illustrate that the present invention can be implemented. These embodiments can fully introduce the technical content of the present invention to those skilled in the art, making the technical content of the present invention clearer and easier to understand. However, the present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0051] In the drawings, components with the same structure are indicated by the same numerical labels, and components with similar structures or functions are indicated by similar numerical labels. Directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, upper surface, lower surface, side, top surface, bottom, front end, rear end, end, etc., are only directions in the drawings and are only used to explain and illustrate the present invention, but not to limit the scope of protection of the present invention.

[0052] In the drawings, components with the same structure are indicated by the same numerical reference numerals. When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted to" or "connected to" another component, the two may be understood to be directly "mounted" or "connected", or one component may be indirectly "mounted to" or "connected to" another component through an intermediate component.

[0053] Example 1

[0054] like Figures 1 to 3 As shown, this embodiment provides a needle for an injection pen, and the needle for an injection pen includes a needle seat 1, a needle tube 2, a holder 3, and a needle tip shield 4. The needle tube 2 is fixedly mounted to the needle seat 1. The holder 3 is tubular and is engaged with the needle seat 1. The needle tip shield 4 is tubular, and the inner surface of the needle tip shield 4 is provided with three sliders 41, and each slider 41 can be slidably mounted to the needle seat 1.

[0055] like Figures 4 to 6As shown, the outer surface of the holder 3 is provided with a first groove 31. Each slider 41 is provided with a protrusion 414 on the outer surface facing the holder 3, and each protrusion 414 is engaged with the first groove 31. The interaction force between the protrusion 414 and the groove 31 can prevent the needle tip shield 4 from sliding down due to vibration during transportation or natural gravity, thereby preventing the needle tip from being exposed. When the user uses the injection pen needle of the utility model, only a certain pressure is applied to the needle tip shield 4 to separate the protrusion 414 from the groove 31, so that the injection pen needle can be used normally.

[0056] After the needle for the injection pen is used, the user pulls out the needle tip shield 4 to reset it. When the user successfully restores the needle tip shield 4 to its initial position, the protrusion 414 and the groove 31 will re-engage with each other. The special touch produced by the engagement of the protrusion 414 and the groove 31 will serve as a reminder of whether the needle tip shield 4 is accurately reset, thereby preventing the user from resetting the needle tip shield 4 incompletely due to operational errors. This prevents the needle tip from being exposed, thereby preventing the sharp needle tip of the needle tube 2 from causing secondary damage to the user or others after being abandoned.

[0057] At the same time, the structure of the protrusion 414 and the groove 31 is that the surface of the groove 31 provides a support force to the lower surface of the protrusion 414, so as to balance the gravity of the needle tip shield 4. Compared with the solution in the prior art that uses the friction between the needle tip shield 4 and the needle seat 1 to balance the gravity of the needle tip shield 4, the solution of this embodiment reduces the pressure between the needle tip shield 4 and the needle seat 1, thereby preventing the pressure from causing deformation or aging of the needle tip shield 4 after a long time.

[0058] like Figures 7 to 10As shown, the needle seat 1 includes a base, a needle sleeve 12 and three clamping columns 13. The base is cylindrical and hollow inside, and is used to accommodate liquid medicine, such as common insulin for treating diabetes. The annular outer surface of the base is provided with a plurality of protruding edges and corners, which increase the friction between the needle for the injection pen and the user's hand, and prevent the user's hand from slipping when holding the needle for the injection pen. The needle sleeve 12 is arranged at the top of the base, and the needle sleeve 12 is provided with a first through hole 121, and the first through hole 121 extends from the top of the needle sleeve 12 to the bottom of the needle sleeve 12. The first through hole 121 is used to install the needle tube 2, so that the needle tube 2 passes through the first through hole 121 and extends to the inside of the base. The needle sleeve 12 is used to fix the needle tube 2. In this embodiment, the top of the needle sleeve 12 is sealed and fixed with glue. The first point is to prevent the needle tube 2 from shaking during use and maintain the stability of the liquid medicine when it is injected. The second point is to prevent the leakage of liquid medicine, so that the needle of the injection pen fails. The needle tube 2 is used to pierce the patient's skin and deliver the liquid medicine into the patient's body. In this embodiment, the needle seat 1 also includes three clamping columns 13. Each clamping column 13 is arranged at the top of the base, and multiple clamping columns 13 are arranged around the needle tube sleeve 12, so that there is a gap 131 between each clamping column 13 and the needle tube sleeve 12. The gap 131 is used to install the clamping seat 3, so that the clamping seat 3 is clamped to the needle seat 1. A slide groove is formed between each clamping column 13 and another adjacent clamping column 13, and each slide groove is used to install a slider 41, so that each slider 41 can be slidably installed to a slide groove. The gap 131 between the clamping column 13 and the needle tube sleeve 12 is used to install the clamping seat 3. The clamping seat 3 plays a supporting and fixing role in this scheme. There is a mutual interference fit and buckle structure between the clamping seat 3 and the needle tube 2 bracket and the needle tip sheath 4, which plays a role in preventing the needle tip sheath 4 from falling out. The slider 41 and the slide groove can enable the needle tip shield 4 to slide up and down stably, so that the needle tip can be switched between the exposed and hidden states.

[0059] like Figures 7 to 13As shown, a protrusion 132 is provided on one side of the top of each clamping column 13. The inner surface of the needle tip shield 4 is provided with more than two ratchet teeth 42, each ratchet tooth 42 is located between two adjacent sliders 41, and each ratchet tooth 42 separates the two adjacent sliders 41 into a first groove 421 and a second groove 422. Each ratchet tooth 42 protrudes from the inner surface of the needle tip shield 4 and extends in a direction away from the first groove 421. When each slider 41 slides in a slide groove, the protrusion 132 of each clamping column 13 slides in a first groove 421. When each protrusion 414 is engaged with the first groove 31, the needle tip shield 4 can rotate, so that the protrusion 132 of each clamping column 13 rotates to a second groove 422, and engages with the ratchet tooth 42 so that it cannot rotate in the opposite direction. In the solution of this embodiment, when each protrusion 414 is engaged with the first groove 31, the slider 41 is constrained by the protrusion 132 of one post 13 in the horizontal direction, but is not constrained by another adjacent post 13 in the horizontal direction, so that the slider 41 can rotate in one direction. The protrusion 132 of each post 13 rotates to a second groove 422, but due to the orientation of the ratchet 42, the reversal of the protrusion 132 of each post 13 is constrained. Therefore, the ratchet 42 can cooperate with the protrusion 132 to prevent the needle tip shield 4 from reversing. At the same time, each slider 41 abuts against a side of the top of a post 13 where the protrusion 132 is not provided, so that each slider 41 cannot slide in the vertical direction. The above function shows that when the user injects the liquid medicine into the patient's body, the user can pull out the needle tip shield 4 so that the needle tip of the needle tube 2 is hidden by the needle tip shield 4. At the same time, the needle tip shield 4 can be rotated by the user so that the protrusion 132 of each clamping column 13 rotates to a second groove 422, and the reversal of the needle tip shield 4 is restricted. At the same time, since each slider 41 cannot slide in the vertical direction, the needle tip shield 4 is fixed after rotation, so that the needle tip of the needle tube 2 is always in a hidden state.

[0060] like Fig.14 As shown, the slider 41 includes a first protrusion 411 and a second protrusion 412. The first protrusion 411 protrudes from the inner surface of the needle tip shield 4. The second protrusion 412 protrudes from the inner surface of the needle tip shield 4. The first protrusion 411 abuts against the holder 3 on the side facing the needle tube 2. The second protrusion 412 abuts against the holder 3 on the side facing the needle tube 2. The first protrusion 411 and the second protrusion 412 of the slider 41 form a circular structure, so that the needle tip shield 4 has a certain stability when in the lifting state, so that the axial movement of the needle tip shield 4 is not easy to shake or deflect, thereby preventing the needle tube from easily deflecting after piercing the patient's skin.

[0061] like Fig.15As shown, the outer surface of the needle tip shield 4 is provided with a first annular boss 43, which protrudes from the top of the outer surface of the needle tip shield 4. The outer surface of the needle tip shield 4 is provided with a second annular boss 44, which protrudes from the bottom of the outer surface of the needle tip shield 4. The design of the first annular boss 43 and the second annular boss 44 on the outer surface of the needle tip shield 4 makes the upper and lower ends of the needle tip shield 4 have edges and corners, respectively, to prevent the user's fingers from slipping when pulling the needle tip shield 4.

[0062] like Fig.16 As shown, the needle for the injection pen also includes a needle seat sheath 5 and a dialysis paper 6. The needle seat sheath 5 is covered on the outer surface of the needle seat 1. The dialysis paper 6 is sealed and connected to the bottom of the needle seat 1. The needle seat sheath 5 is used to protect the needle tube 2 and the needle seat 1, prevent the leakage of liquid medicine, and prevent the needle tube 2 and the needle seat 1 from being damaged. The special properties of the dialysis paper 6 can block the entry of bacteria and dust, but allow ethylene oxide and steam to pass through. Therefore, during the sterilization process, ethylene oxide vapor can pass through the dialysis paper 6 and penetrate into the sealed package to kill the bacteria and spores inside. During the entire transportation and storage process from the completion of sterilization to the final use, the dialysis paper 6 can ensure that the interior of the package is not invaded by bacteria and dust, thereby achieving the sterilization of the medical device.

[0063] like Figures 1 to 16 As shown, in actual situations, when the injection pen needle of this embodiment is not in use, the interaction force between the protrusion 414 and the groove 31 can prevent the needle tip shield 4 from sliding down due to vibration during transportation or natural gravity, thereby preventing the needle tip from being exposed.

[0064] When the user uses the injection pen needle of the utility model, he only needs to point the needle tube 2 toward the patient and apply pressure so that the needle tube 2 can be inserted into the patient's body. At the same time, the needle tip shield 4 is subjected to the reaction force from the patient's skin, which can separate the protrusion 414 and the groove 31 from each other, allowing the needle tip shield 4 to slide toward the base.

[0065] After the needle tip for the injection pen is used, the user needs to pull out the needle tip shield 4 to reset it because the needle tip is in an exposed state. When the user successfully restores the needle tip shield 4 to its initial position, the protrusion 414 and the groove 31 will re-engage with each other. The special touch produced by the engagement of the protrusion 414 and the groove 31 will serve as a reminder of whether the needle tip shield 4 is accurately reset, thereby avoiding the situation where the user resets the needle tip shield 4 but does not reset it in place due to operational errors. This prevents the needle tip from being still in an exposed state, and further prevents the sharp needle tip of the needle tube 2 from causing secondary damage to the user or others after being abandoned. Then, the user can rotate the needle tip shield 4 so that the protrusion 132 of each clamping column 13 of the needle tip shield 4 rotates to a second groove 422, but due to the orientation of the ratchet 42, the reversal of the protrusion 132 of each clamping column 13 is constrained. Therefore, the ratchet 42 can cooperate with the protrusion 132 to prevent the needle tip shield 4 from reversing. At the same time, each slider 41 abuts against a side of the top of a clamping column 13 where no protrusion 132 is provided, so that each slider 41 cannot slide in the vertical direction. Therefore, the needle tip shield 4 is fixed after rotation, so that the needle tip of the needle tube 2 is always in a hidden state.

[0066] The advantage of this embodiment is that it provides a needle for an injection pen, wherein the inner surface of the needle tip shield is provided with two or more sliders, the sliders include a first protrusion and a second protrusion, and the first protrusion and the second protrusion abut against the holder on one side of the needle tube, thereby increasing the stability of the needle tip shield during axial movement, making it difficult for the needle tip shield to shake or deflect during axial movement, thereby preventing the needle tube from easily deflecting after piercing the patient's skin.

[0067] The outer surface of the holder of the injection pen needle is provided with a first groove. The inner surface of the needle tip shield is provided with more than two sliders, each slider is provided with a protrusion facing the outer surface of the holder, and each protrusion is engaged with the first groove. The interaction force between the protrusion and the groove can prevent the needle tip shield from sliding down due to vibration during transportation or natural gravity, thereby preventing the needle tip from being exposed. When the user uses the injection pen needle of the utility model, only a certain pressure is applied to the needle tip shield to separate the protrusion and the groove from each other, so that the injection pen needle can be used normally.

[0068] After using the needle for the injection pen, the user pulls out the needle tip shield to reset it. When the user successfully restores the needle tip shield to its original position, the bump and the groove will re-engage each other. The special touch produced by the engagement of the bump and the groove will serve as a reminder of whether the needle tip shield is accurately reset, thereby preventing the user from resetting the needle tip shield incompletely due to operational errors. This prevents the needle tip from being exposed, thereby preventing the sharp needle tip of the needle tube from causing secondary harm to the user or others after being abandoned.

[0069] Example 2

[0070] like Fig.17 As shown, Example 2 includes most of the technical features of Example 1. The difference between Example 2 and Example 1 is that the slider of this embodiment includes a connecting plate 413, one end of the connecting plate 413 is connected to the first protrusion 411, and the other end of the connecting plate 413 is connected to the second protrusion 412. The connecting plate 413 is used to install the protrusion 414, so that the protrusion 414 protrudes from the surface of the connecting plate 413 and is engaged with the first groove. The other components of this embodiment not mentioned in the above text are the same as those of Example 1, and are not repeated here.

[0071] The slider 41 of this embodiment includes a first protrusion 411, a second protrusion 412 and a connecting plate 413. The first protrusion 411 protrudes from the inner surface of the needle tip shield 4. The second protrusion 412 protrudes from the inner surface of the needle tip shield 4. One end of the connecting plate 413 is connected to the first protrusion 411, and the other end of the connecting plate 413 is connected to the second protrusion 412. The connecting plate 413 is used to install the protrusion 414, so that the protrusion 414 protrudes from the surface of the connecting plate 413 and is engaged with the first groove.

[0072] The advantage of this embodiment is that the connecting plate is equivalent to an arch bridge type soft positioning mechanism, and when the protrusion on it is engaged with the first groove, the needle of the injection pen can be kept in a state where the needle tip of the needle tube cannot be seen. At the same time, when the needle tip sheath is pulled up until the protrusion is engaged with the first groove, the elastic connecting plate will provide a touch sense of being in place as a reminder to the user.

[0073] Example 3

[0074] like Fig.18 As shown, Example 3 includes most of the technical features of Example 1. The difference between Example 3 and Example 1 is that the needle tip shield of this embodiment includes three connecting arms 45, and the connecting arms 45 are arc-shaped. One end of each connecting arm 45 is connected to the first protrusion 411 of a slider, and the other end of each connecting arm 45 is connected to the second protrusion 412 of another slider. Other components of this embodiment not mentioned in the above text are the same as those of Example 1, and are not described here.

[0075] The needle tip shield of this embodiment includes three connecting arms 45, and the connecting arms 45 are arc-shaped. One end of each connecting arm 45 is connected to the first protrusion 411 of a slider, and the other end of each connecting arm 45 is connected to the second protrusion 412 of another slider. The three connecting arms 45 together form a circle. The circular structure formed by the three connecting arms 45 fits with the holder, making the needle tip shield more stable in axial movement and rotational movement. This makes it difficult for the needle tip shield to shake or deflect, thereby preventing the needle tube from easily deflecting after piercing the patient's skin.

[0076] The advantage of this embodiment is that the circular structure formed by the three connecting arms fits with the holder, making the needle tip shield more stable in axial and rotational motions, making it difficult for the needle tip shield to shake or deflect, thereby preventing the needle tube from easily deflecting after piercing the patient's skin.

[0077] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A needle for an injection pen, characterized in that: include: Needle holder; A needle tube, fixedly mounted to the needle seat; A card holder, which is tubular and is engaged with the needle holder; as well as A needle tip shield, the needle tip shield is tubular, and the inner surface of the needle tip shield is provided with two or more sliders, each of which can be slidably mounted to the needle seat; The slider comprises: a first protrusion, the first protrusion protruding from the inner surface of the needle tip shield, the first protrusion abutting against the holder on a side facing the needle tube; and A second protrusion protrudes from the inner surface of the needle tip shield; the second protrusion abuts against the holder on one side facing the needle tube.

2. The needle for an injection pen according to claim 1, characterized in that: The outer surface of the card seat is provided with a first groove; A protrusion is provided on the outer surface of each sliding block facing the card seat, and each protrusion is engaged with the first groove.

3. The needle for an injection pen according to claim 2, characterized in that: The slider further comprises: A connecting plate, one end of which is connected to the first protrusion, and the other end of which is connected to the second protrusion; the connecting plate is used to install the protrusion, so that the protrusion protrudes from the surface of the connecting plate and is engaged with the first groove.

4. The needle for an injection pen according to claim 1, characterized in that: The needle seat comprises: substrate; a needle cannula, the needle cannula being disposed on the top of the base, the needle cannula being provided with a first through hole, the first through hole extending from the top of the needle cannula to the bottom of the needle cannula; the first through hole being used to install the needle tube, so that the needle tube passes through the first through hole and extends into the inside of the base; and There are more than two clamping columns, each of which is arranged on the top of the base, and the multiple clamping columns are arranged around the needle tube sleeve, so that there is a gap between each clamping column and the needle tube sleeve; the gap is used to install the clamping seat, so that the clamping seat is clamped to the needle seat; a slide groove is formed between each clamping column and another adjacent clamping column, and each slide groove is used to install a slider, so that each slider can be slidably installed in a slide groove.

5. The needle for an injection pen according to claim 4, characterized in that: A protrusion is provided on one side of the top of each clamping column; The inner surface of the needle tip shield is provided with more than two ratchets, each ratchets is located between two adjacent sliders, each ratchets separates the two adjacent sliders into a first groove and a second groove, each ratchets protrudes from the inner surface of the needle tip shield and extends in a direction away from the first groove.

6. The needle for an injection pen according to claim 5, characterized in that: When each slide block slides in a slide groove, the protrusion of each clamping column slides in a first groove.

7. The needle for an injection pen according to claim 2 or 5, characterized in that: When each protrusion is engaged with the first groove, the needle tip shield can rotate, so that the protrusion of each clamping column rotates to a second groove and engages with each other on the ratchet teeth so that they cannot rotate in the opposite direction; at the same time, each slider abuts against a side of the top of a clamping column where no protrusion is provided, so that each slider cannot slide in the vertical direction.

8. The needle for an injection pen according to claim 1, characterized in that: The outer surface of the needle tip shield is provided with a first annular boss, and the first annular boss protrudes from the top of the outer surface of the needle tip shield; The outer surface of the needle tip shield is provided with a second annular boss, and the second annular boss protrudes from the bottom of the outer surface of the needle tip shield.

9. The needle for an injection pen according to claim 1, characterized in that: The needle tip shield is fixedly connected to the needle tube sleeve through more than two connecting arms, and each connecting arm can be slidably mounted to the needle seat.

10. The needle for an injection pen according to claim 1, characterized in that: Also includes: A needle seat sheath, covering the outer surface of the needle seat; as well as Dialysis paper is sealed and connected to the bottom of the needle hub.

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