Injection needle and injector
By using nickel to manufacture and electroplating the needle tip, the problem of easy breakage of microinjection needle tips has been solved, the rigidity and toughness of the needle tip have been improved, and the service life has been extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-04-03
AI Technical Summary
Existing microinjection needles have poor needle rigidity and toughness, making them prone to breakage.
The needle is made of nickel and connected to the stainless steel needle body by electroplating to enhance the rigidity and toughness of the needle.
It improves the rigidity and toughness of the needle, extends its service life, and reduces the possibility of needle breakage.
Smart Images
Figure CN224070907U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to an injection needle and syringe. Background Technology
[0002] Currently, microinjection needles are widely used. In existing technologies, both the needle body and the needle tip of microinjection needles are made of stainless steel, but the needle tip has poor rigidity and toughness, making it prone to breakage. Utility Model Content
[0003] The purpose of this application is to provide an injection needle and syringe that improves the rigidity and toughness of the needle tip, making the needle tip less prone to breakage.
[0004] The embodiments of this application are implemented as follows:
[0005] In a first aspect, this application provides an injection needle, which includes a needle hub, a needle body, and a needle tip. One end of the needle body is connected to one end of the needle hub, and the other end of the needle body is connected to one end of the needle tip. The needle body is made of stainless steel, and the needle tip is made of nickel.
[0006] In one embodiment, one end of the needle tip is electroplated to cover the other end of the needle body.
[0007] In one embodiment, the needle tip has a first flow channel extending along the axial direction of the needle tip and penetrating the needle tip. The diameter of the needle tip is 0.054 mm to 0.178 mm, the diameter of the first flow channel is 0.024 mm to 0.122 mm, and the wall thickness of the needle tip is 0.01 mm to 0.03 mm.
[0008] In one embodiment, the roughness of the channel wall of the first channel is less than 0.02.
[0009] In one embodiment, the needle holder has a second flow channel extending along the axial direction of the needle holder and penetrating the needle holder. The second flow channel includes a first part, a tapered part and a second part connected in sequence. One end of the needle body extends into the second part. The diameter of the first part is larger than the diameter of the second part. The cone angle of the tapered part is 140° to 150°.
[0010] In one embodiment, the injection needle further includes a plurality of protrusions spaced circumferentially on the needle seat, the plurality of protrusions being close to the other end of the needle seat; the plurality of protrusions are for engaging with a Luer connector inside the syringe, and the surface of each protrusion near the needle body is inclined toward the axis of the needle seat.
[0011] In one embodiment, the injection needle further includes a plurality of grooves spaced circumferentially on the needle seat, the plurality of grooves being away from the other end of the needle seat.
[0012] In one embodiment, the other end of the needle is formed with a bevel, and the bevel forms a first angle with the axis of the needle, the first angle being 35° to 45°.
[0013] In one embodiment, the needle includes a straight tube section and a bent section. One end of the straight tube section is connected to the other end of the needle body, and the other end of the straight tube section is connected to one end of the bent section. The bent section and the straight tube section form a bending angle of 120° to 160°. The other end of the bent section forms a slope, and the slope forms a first angle with the axis of the bent section.
[0014] Secondly, this application provides a syringe that, in addition to the aforementioned injection needle, also includes a Luer connector and a syringe barrel; the syringe barrel, the Luer connector, and the injection needle are connected in sequence.
[0015] The advantages of this application compared to the prior art are:
[0016] This application uses nickel to manufacture the needle, which improves the rigidity and toughness of the needle, making it less prone to breakage and extending its service life. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of the injection needle shown in this application;
[0019] Figure 2 This application illustrates the structure of the needle body and needle tip. Figure 1 ;
[0020] Figure 3 This application illustrates the structure of the needle body and needle tip. Figure 2 ;
[0021] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;
[0022] Figure 5 This is a front view of the needle holder shown in this application;
[0023] Figure 6 This is a cross-sectional view of the needle holder shown in this application;
[0024] Figure 7 This is a side view of the needle holder shown in this application;
[0025] Figure 8 This is a schematic diagram showing the position of the protrusions and grooves on the needle holder as illustrated in this application.
[0026] Figure label:
[0027] 1-Injection needle; 10-Needle hub; 11-First part; 12-Conical part; 13-Second part; 14-Protrusion; 15-Annular protrusion; 20-Needle body; 21-Target flow channel; 30-Needle tip; 31-Straight tube section; 32-Bent section; 131-First flow channel section; 132-Second flow channel section; 151-Groove; 301-Sloping surface; 302-First axis; 321-Second axis. Detailed Implementation
[0028] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.
[0029] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0030] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0031] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.
[0032] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.
[0033] This application provides a syringe that can be used in conjunction with a person to inject medication into a patient's affected area; alternatively, the syringe can be mounted on an infusion pump, which drives the syringe to inject medication into the patient's affected area. The syringe includes a syringe barrel, a Luer connector, and an injection needle connected in sequence. The connection method between the syringe barrel and the Luer connector is the same as in the prior art and will not be described further here; similarly, the connection method between the injection needle and the Luer connector is the same as in the prior art and will not be described further here.
[0034] like Figure 1 As shown, the injection needle 1 includes a needle hub 10, a needle body 20, and a needle tip 30. One end of the needle body 20 is connected to one end of the needle hub 10, and the other end of the needle body 20 is connected to one end of the needle tip 30. The other end of the needle hub 10 is connected to a Luer connector. The injection needle 1 has an injection channel extending along the axial direction of the injection needle 1 and penetrating the injection needle 1. When injecting medication into the patient's affected area, the other end of the needle tip 30 pierces into the patient's affected area, and the medication in the syringe flows into the injection channel through the Luer connector and then into the patient's affected area.
[0035] Furthermore, in this application, the needle body 20 is made of stainless steel, and the needle tip 30 is made of nickel. By using nickel to manufacture the needle tip 30, the rigidity and toughness of the needle tip 30 are improved, making the needle tip 30 less prone to breakage and extending its service life.
[0036] In some preferred embodiments, the needle body 20 is made of medical stainless steel; for example, the needle body 20 may be made of stainless steel of the type SUS304 (304 stainless steel) or SUS316 (316 stainless steel).
[0037] In some preferred embodiments, the nickel used in the needle 30 may be 99% or higher in purity.
[0038] In some preferred embodiments, such as Figure 2 and Figure 3 As shown, one end of the needle tip 30 is electroplated to cover the other end of the needle body 20. Here, "one end of the needle tip 30 is electroplated to cover the other end of the needle body 20" means that after the needle tip 30 is processed by electroplating, one end of the needle tip 30 covers the other end of the needle body 20.
[0039] Specifically, the needle 30 can be manufactured in the following manner:
[0040] First, a needle mold is processed. Then, one end of the needle mold is fixedly connected to the other end of the needle body 20. Next, a nickel layer is electroplated onto the mold. After electroplating, the needle body 20 and the mold with the nickel layer are placed in an ultrasonic cleaning device for ultrasonic cleaning to remove the mold. After successful removal, the processing of the needle 30 is completed. After processing, one end of the needle 30 covers the other end of the needle body 20.
[0041] In existing technologies, the needle body 20 and needle tip 30 are connected by adhesive bonding. However, this connection method is prone to breakage at the joint between the needle body 20 and needle tip 30. In this embodiment, one end of the needle tip 30 covers the other end of the needle body 20. This connection method provides better rigidity and toughness at the joint between the needle tip 30 and needle body 20, improving the connection strength and making the joint less prone to breakage.
[0042] In some preferred embodiments, such as Figure 2 and Figure 3 As shown, the needle body 20 has a target flow channel 21 that extends along the axial direction of the needle body 20 and penetrates the needle body 20; one end of the needle mold can be fixedly connected to the target flow channel 21.
[0043] In this embodiment, the needle mold is fixedly connected to the flow channel of the needle body 20, and the connection method is simple and easy to implement.
[0044] In some preferred embodiments, the needle mold can be fabricated using resin. After fabrication, one end of the needle mold is fixedly connected to the other end of the needle body 20. After the connection is completed, the needle body 20 and the mold are placed in an ion sputtering instrument to sputter a conductive layer onto the surface of the mold, making the mold conductive. Then, the needle 30 is fabricated using the method described in the above embodiments.
[0045] In this embodiment, the needle mold is made of resin, which reduces the cost.
[0046] In some preferred embodiments, the needle 30 has a first flow channel extending axially and penetrating the needle 30. The diameter of the needle 30 is 0.054–0.178 mm, the diameter of the first flow channel is 0.024 mm–0.122 mm, the wall thickness of the needle 30 is 0.01 mm–0.03 mm, and the roughness of the flow channel wall is less than 0.02. The diameter of the needle 30 is its outer diameter, and the diameter of the first flow channel is its inner diameter. The diameter of the first flow channel is determined by the diameter of the needle mold in the above embodiments, and the wall thickness is determined by the thickness of the electroplated nickel layer. Different thicknesses of nickel layers can be electroplated by controlling the electroplating time or the current density during electroplating. The diameter of the needle 30 is determined by the diameter of the first flow channel and the wall thickness of the needle 30.
[0047] As can be seen, in this embodiment, when the outer diameter of the needle 30 is small, the inner diameter of the needle 30 can be made larger and the roughness of the inner diameter is smaller. This makes the flow of the drug in the needle 30 smoother, less prone to blockage, and improves the drug delivery efficiency.
[0048] In some preferred embodiments, depending on the needle 30 model, the inner diameter, outer diameter and wall thickness of the needle 30 can be related as shown in Table 1 below. In practice, the appropriate needle 30 model can be selected according to the injection requirements.
[0049] Table 1: Correspondence between the inner diameter, outer diameter, and wall thickness of needles of different models (30).
[0050]
[0051]
[0052] In Table 1 above, G represents the specification unit for needle 30, which is the diameter of the needle 30, also known as Gauge.
[0053] In some preferred embodiments, the appropriate length of the injection needle 1 can be selected according to the injection site and usage scenario. Specifically, when it is necessary to inject medication into the superficial layer of the patient's affected area, an injection needle 1 with a shorter needle tip 30 can be selected; when it is necessary to inject medication into the deeper layer of the patient's affected area, an injection needle 1 with a longer needle tip 30 can be selected. For example, the length of the injection needle 1 can be 1mm to 7mm.
[0054] In some preferred embodiments, such as Figure 2 As shown, the needle 30 has a straight needle shape; specifically, when the needle 30 is in a straight needle shape, the other end of the needle 30 forms a bevel 301, and the bevel 301 and the axis of the needle 30, i.e., the first axis 302, form a first angle V, which is 35° to 45°. The aforementioned bevel 301 is the tip of the injection needle 1, and the first angle V is the tilt angle of the needle tip. After the needle 30 is processed in the above manner, the bevel 301 can be processed on the other end of the needle 30 by grinding.
[0055] In this embodiment, by setting the tilt angle of the needle tip, the damage to the patient's affected area is minimized while ensuring injection efficiency.
[0056] In some preferred embodiments, such as Figure 3 and Figure 4As shown, the needle 30 has a curved needle shape. Specifically, when the needle 30 is in a curved needle shape, it includes a straight tube section 31 and a bent section 32. One end of the straight tube section 31 is connected to the other end of the needle body 20, and the other end of the straight tube section 31 is connected to one end of the bent section 32. The bent section 32 and the straight tube section 31 form a bending angle N, which is 120° to 160° and can be set according to the injection position. The other end of the bent section 32 forms a slope 301, and the slope 301 and the axis of the bent section 32, i.e., the second axis 321, form a first angle V. In this embodiment, after the needle 30 is processed in the above manner, the slope 301 can be processed by grinding. After processing, the needle 30 is heated to form the bent section 32 and the straight tube section 31 with the bending angle.
[0057] As can be seen, in this application, the needle 30 has two forms: straight needle and curved needle, which can adapt to different work scenarios and work needs, and has strong compatibility.
[0058] In some preferred embodiments, the diameter of the needle body 20 can be 0.40 mm to 0.53 mm, the diameter of the target flow channel 21 inside the needle body 20 can be 0.16 mm to 0.28 mm, and the wall thickness of the needle body 20 can be 0.20 mm to 0.29 mm. Wherein, the diameter of the needle body 20 is its outer diameter, and the diameter of the target flow channel 21 is its inner diameter.
[0059] Specifically, depending on the model of needle body 20, the inner diameter, outer diameter and wall thickness of needle body 20 can be represented by the relationship shown in Table 2 below. In practice, the appropriate model of needle body 20 can be selected according to the injection requirements.
[0060] Table 2: Correspondence between the inner diameter, outer diameter, and wall thickness of needles of different models (20).
[0061] Needle body model Inner diameter(mm) Outer diameter (mm) Wall thickness (mm) 25G 0.24～0.28 0.50～0.53 0.22～0.29 26G 0.18～0.22 0.44～0.47 0.22～0.29 27G 0.16～0.20 0.40～0.42 0.20～0.26
[0062] In Table 2 above, G represents the specification unit of the needle body 20, which is the diameter of the needle body 20, also known as Gauge.
[0063] In some preferred embodiments, the length of the needle body 20 can be 30mm to 40mm. The appropriate length of the needle body 20 can be selected according to the application scenario.
[0064] In some preferred embodiments, one end of the needle body 20 is riveted to one end of the needle holder 10. In this embodiment, the needle body 20 is connected to the needle holder 10 by riveting, which is a simple and secure connection method.
[0065] In some preferred embodiments, when according to Figure 5 When the needle holder 10 is cut along direction A, it is possible to obtain Figure 6 ,like Figure 6 As shown, the needle holder 10 has a second flow channel extending along the axial direction of the needle holder 10 and penetrating the needle holder 10. The second flow channel includes a first part 11, a tapered part 12, and a second part 13 connected in sequence. One end of the needle body 20 extends into the second part 13. The diameter of the first part 11 is larger than the diameter of the second part 13, and the cone angle of the tapered part 12 is 140° to 150°. During drug injection, the tip of the injection needle 1 pierces the patient's affected area. The drug in the syringe flows through the Luer connector sequentially through the first part 11, the tapered part 12, and the second part 13 of the second flow channel into the target flow channel 21 of the needle body 20, and then flows into the first flow channel through the target flow channel 21, and finally into the patient's affected area through the first flow channel.
[0066] In the prior art, the cone angle of the aforementioned conical portion 12 is typically around 120 degrees. This angle setting makes it easy for the drug to remain in the first portion 11 and / or the conical portion 12 during injection. In this embodiment, by setting the angle of the conical portion 12 to 140° to 150°, the amount of drug residue in the first portion 11 and / or the second portion 13 is reduced.
[0067] In some preferred embodiments, such as Figure 6 As shown, the second part 13 includes a first flow channel section 131 and a second flow channel section 132 connected to each other. The diameter of the first flow channel section 131 is larger than the diameter of the second flow channel section 132. The second flow channel section 132 is located between the tapered part 12 and the first flow channel section 131. One end of the needle body 20 extends into the first flow channel section 131 and abuts against the inner bottom surface of the first flow channel section 131. In this way, one end of the needle body 20 can be firmly located in the first flow channel section 131.
[0068] In some preferred embodiments, when according to Figure 6 When observing the needle holder 10 in the direction of the arrow, one can obtain... Figure 7 ,like Figure 6 , Figure 7 and Figure 8 As shown, the injection needle 1 also includes a plurality of protrusions 14 spaced circumferentially on the needle seat 10, with the protrusions 14 located near the other end of the needle seat 10. The protrusions 14 are used to mate with a Luer connector inside the syringe, and the surface P of each protrusion 14 near the needle body 20 is inclined towards the axis of the needle seat 10. Exemplarily, two protrusions 14 may be provided, symmetrical about the axis of the needle seat 10. It is understood that other numbers of protrusions 14 may be provided as needed.
[0069] When connecting the needle seat 10 to the Luer connector, it is usually necessary to screw the protrusion 14 on the needle seat 10 into the internal thread of the Luer connector. In this embodiment, by providing a surface P with a certain slope on the protrusion 14, the protrusion 14 is more easily screwed into the internal thread of the Luer connector, and the internal thread of the Luer connector can be tightly fitted with the protrusion 14 when screwed.
[0070] In some preferred embodiments, such as Figure 8 As shown, the injection needle 1 also includes a plurality of grooves 151 spaced circumferentially on the needle seat 10, the plurality of grooves 151 being away from the other end of the needle seat 10.
[0071] When tightening the protrusion 14 on the needle hub 10 into the internal thread of the Luer connector, the doctor or professional operator needs to grip the outer side of the needle hub 10. However, in the prior art, the side of the needle hub 10 is annular, which can easily cause slippage when the user grips the outer side of the needle hub 10. This may result in the protrusion 14 not being fully tightened into the internal thread, leading to leakage. In this embodiment, multiple grooves 151 are provided on the needle hub 10, allowing the doctor or professional operator to grip the grooves 151 when tightening the protrusion 14 into the internal thread of the Luer connector, making it easier to tighten the protrusion 14 into the internal thread and alleviating leakage.
[0072] In some preferred embodiments, the groove 151 can be an arc-shaped groove 151 with a radius of 0.4 to 0.6. Four arc-shaped grooves 151 can be provided, evenly distributed along the circumference of the needle holder 10. In this embodiment, setting the groove 151 as an arc-shaped groove facilitates the processing of the groove 151.
[0073] In some preferred embodiments, such as Figure 6 and Figure 8 As shown, an annular protrusion 15 may be provided on the needle holder 10 at the other end away from the needle holder 10, and the aforementioned plurality of grooves 151 may be provided on the annular protrusion 15. In this embodiment, by providing the annular protrusion 15, the diameter of the needle holder 10 is increased, making it easier for doctors or professional operators to grip the aforementioned grooves 151.
[0074] After manufacturing the injection needle 1 according to the method described in the above embodiments, the inventors tested the performance of the injection needle 1 to determine whether the manufactured injection needle 1 meets the requirements of GB18457-2015. The test content is explained below:
[0075] (1) The inventor tested the stiffness of the injection needle 1 under the rigid test conditions of a span of 5mm and a load of 1.2N. The test results showed that the deflection of the injection needle 1 was maintained between 0.1 and 0.2. This test result shows that the stiffness of the injection needle 1 meets the requirements of GB18457-2015.
[0076] (2) The inventor tested the toughness of the injection needle 1 under the premise that the distance between the fixed fulcrum and the load point is 6mm. The test found that the needle tip could swing back and forth 20 to 30 times with a swing angle of 20°, and the needle tip did not break after swinging. This test result shows that the toughness of the injection needle 1 meets the requirements of GB18457-2015.
[0077] (3) The inventors tested the connection strength of the injection needle 1 using a connection strength tester. During the test, the upper end of the connection strength tester clamped the needle tip 30, and the lower end of the connection strength tester clamped the needle body 20. The upper end of the connection strength tester was slowly moved upward with a force of 11N for 12-15 seconds. After the movement, when the injection needle 1 was removed from the connection strength tester, the injection needle 1 did not break. The above test results show that the connection strength of the injection needle 1 meets the requirements of GB18457-2015.
[0078] (4) When the inventor infuses the drug into the injection needle 1 with a pressure of 90-95 kPa, a stable water column can be formed at the needle tip. The above test results show that the patency of the injection needle 1 meets the requirements of GB18457-2015.
[0079] (5) The inventor used a polyurethane film with a thickness of 0.35mm±0.05mm to simulate skin material, and when the tip of the injection needle 1 was inserted into the simulated skin material, the puncture force was measured to be 0.08~0.12N; the above test results show that the puncture force of the injection needle 1 meets the requirements of GB18457-2015.
[0080] As can be seen from the above, the injection needle 1 in this application meets the requirements of GB18457-2015, and all performance indicators are good.
[0081] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An injection needle, characterized in that The injection needle comprises a needle seat, a needle body and a needle head, one end of the needle body is connected with one end of the needle seat, the other end of the needle body is connected with one end of the needle head, the needle body is made of stainless steel, and the needle head is made of nickel.
2. The injection needle of claim 1, wherein One end of the needle head is electroplated to cover the other end of the needle body.
3. The injection needle of claim 1, wherein The needle head is provided with a first flow channel extending along the axial direction of the needle head and penetrating through the needle head, the diameter of the needle head is 0.054mm-0.178mm, the diameter of the first flow channel is 0.024mm-0.122mm, and the wall thickness of the needle head is 0.01mm-0.03mm.
4. The injection needle of claim 3, wherein The roughness of the flow channel wall of the first flow channel is less than 0.
02.
5. The injection needle of claim 1, wherein The needle seat is provided with a second flow channel extending along the axial direction of the needle seat and penetrating through the needle seat, the second flow channel comprises a first part, a tapered part and a second part connected in sequence, one end of the needle body extends into the second part, the diameter of the first part is greater than that of the second part, and the taper angle of the tapered part is 140°-150°.
6. The injection needle of claim 1, wherein The injection needle further comprises a plurality of protrusions arranged on the needle seat in the circumferential direction of the needle seat, the plurality of protrusions are close to the other end of the needle seat, the plurality of protrusions are used for cooperating with the luer connector in the syringe, and the surface of each protrusion close to the needle body is inclined towards the axis of the needle seat.
7. The injection needle of claim 1, wherein The injection needle further comprises a plurality of grooves arranged on the needle seat in the circumferential direction of the needle seat, the plurality of grooves are away from the other end of the needle seat.
8. The injection needle of claim 1, wherein The other end of the needle head forms an inclined surface, the inclined surface forms a first angle with the axis of the needle head, and the first angle is 35°-45°.
9. The injection needle of claim 8, wherein The needle head comprises a straight pipe segment and a bent segment, one end of the straight pipe segment is connected with the other end of the needle body, the other end of the straight pipe segment is connected with one end of the bent segment, the bent segment forms a bending angle with the straight pipe segment, the bending angle is 120°-160°, and the other end of the bent segment forms the inclined surface, the inclined surface forms the first angle with the axis of the bent segment.
10. A syringe characterized by, In addition to comprising the injection needle as claimed in any one of claims 1-9, the injection needle further comprises a luer connector and a needle cylinder, and the needle cylinder, the luer connector and the injection needle are connected in sequence.