Two-section type puncture needle with guiding function

Abstract

The invention discloses a two-section type puncture needle with a guiding function, which comprises a flexible section and a puncture section, and the flexible section and the puncture section are integrally in a slender needle shape; one end of the flexible section is fixedly connected with one end of the puncture section, and central axes of the flexible section and the puncture section are positioned on the same straight line; the flexible section has enough flexibility so as to ensure that the skin and muscles of the hand of a user cannot be damaged by the flexible section under the condition that the hand of the user touches the flexible section. The two-section type puncture needle comprises a flexible section and a puncture section which are located on the same straight line, and a user can judge and know the swing angle of the puncture section located in the body of a patient in real time by observing the change of the swing angle of the flexible section located outside the body of the patient.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a two-stage puncture needle with a guiding function. This two-stage puncture needle is used for clinical interventional treatment, and is particularly suitable for minimally invasive surgical scenarios that require precise puncture operations, such as liver and lung tissue biopsies and tumor ablation. Background Technology

[0002] Currently, in clinical puncture procedures, doctors typically rely on image guidance from equipment such as CT scans, digital subtraction angiography (DSA), and magnetic resonance imaging (MRI) to determine the direction, angle, and depth of the puncture. In image-guided punctures, after determining the puncture point, angle, and depth, doctors can only estimate, based on their experience, how the puncture angle and lesion location change with the patient's breathing, and then insert the needle to the target site.

[0003] During a biopsy, the surgeon's estimated puncture angle often deviates from the actual required angle. Because of this inaccurate angle estimation, repeated imaging scans using equipment such as CT, digital subtraction angiography, or MRI are frequently necessary. The puncture angle is then repeatedly adjusted and corrected to ensure the needle reaches the target site. Adding to the difficulty, the lesion's location changes in real time with the patient's breathing, and inconsistent breathing amplitudes introduce considerable uncertainty into the lesion's movement, making accurate estimation extremely challenging. Furthermore, due to the inability to accurately determine the puncture angle and lesion location, the needle can only be inserted very shallowly each time to avoid damaging nearby blood vessels, bronchi, or other critical organs or tissues. Undoubtedly, these procedures prolong the biopsy time and increase the radiation dose received by the patient.

[0004] In view of the above problems, for the case of image-guided puncture surgery, how to provide a device that can help doctors accurately determine the puncture angle, lesion location and puncture depth, so as to make the puncture operation more precise, thereby shortening the puncture operation time, reducing the number of image scans during the puncture process and reducing the radiation dose received by the patient, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a two-stage puncture needle with a guiding function to overcome the above-mentioned defects and shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A two-segment puncture needle with guiding function is provided. The two-segment puncture needle includes a flexible segment and a puncture segment. Both the flexible segment and the puncture segment are generally slender needle-shaped. One end of the flexible segment is fixedly connected to one end of the puncture segment, and the central axes of the two are located on the same straight line. The flexible segment has sufficient flexibility to ensure that the flexible segment will not damage the skin and muscles of the user's hand when the user's hand touches the flexible segment.

[0008] The two-section puncture needle also includes a base; the inner end of the flexible section is fixedly connected to one side of the base, and the inner end of the puncture section is fixedly connected to the other side of the base; the central axes of the flexible section, the base, and the puncture section are located on the same straight line; the base can play a limiting role during needle insertion.

[0009] The flexible segment includes a first inner needle core and a first elastic solenoid coil; the first inner needle core is a slender cylindrical shape, and the interior of the first elastic solenoid coil is hollow; the first inner needle core is disposed inside the first elastic solenoid coil, and the outer diameter of the first inner needle core matches the inner diameter of the first elastic solenoid coil so that the first elastic solenoid coil is directly wound around the outer circumferential surface of the first inner needle core, and the outer end of the first inner needle core is flush with the outer end of the first elastic solenoid coil.

[0010] The puncture section includes a second inner needle core, a third inner needle core, and a second elastic solenoid coil. The second and third inner needle cores are identical and are both elongated semi-cylindrical in shape. The interior of the second elastic solenoid coil is hollow. The second and third inner needle cores are located inside the second elastic solenoid coil and are combined to form a cylindrical needle core. The outer diameters of the second and third inner needle cores match the inner diameter of the second elastic solenoid coil, allowing the second elastic solenoid coil to be directly wound around the outer circumference of the second and third inner needle cores. The end of the second inner needle core is provided with a first half-needle tip, and the end of the third inner needle core is provided with a second half-needle tip. The first and second half-needle tips are combined to form the needle tip of the puncture section. The needle tip is conical and extends from the end of the second elastic solenoid coil.

[0011] The outer contour of the base is in the shape of an unfolded three-petaled flower. The base includes a first blade portion, a second blade portion, a third blade portion, and a tubular connecting portion. The tubular connecting portion is cylindrical in shape and has a circular stepped hole inside. The first, second, and third blade portions are identical and are all slender blade shapes. The stepped hole includes a coaxial first and second circular hole, and the diameter of the first circular hole is smaller than that of the second circular hole. The inner ends of the first, second, and third blade portions are fixedly connected to the outer peripheral surface of the tubular connecting portion in a radial pattern, and the first, second, and third blade portions are evenly distributed along the outer peripheral surface of the tubular connecting portion, such that the included angle between any two of the first, second, and third blade portions is 120°. A gap is provided between any two adjacent blade portions. The two side surfaces of the first, second, and third blade portions are flush with the two end faces of the tubular connecting portion, thereby forming the two side surfaces of the base.

[0012] The stepped holes of the tubular connecting part of the base are used to fix and connect flexible segments and puncture segments with different diameters. The outer diameter of the inner end of the flexible segment matches the inner diameter of the first circular hole of the tubular connecting part of the base, and the inner end of the flexible segment is disposed in the first circular hole, so that the inner end of the flexible segment is fixedly connected to the base. The outer diameter of the inner end of the puncture segment matches the inner diameter of the second circular hole of the tubular connecting part of the base, and the inner end of the puncture segment is disposed in the second circular hole, so that the inner end of the puncture segment is fixedly connected to the base.

[0013] The flexible segment has a length of 5cm to 8cm; the puncture segment has a length of 8cm to 12cm; and the base has a thickness of 0.5mm to 5mm.

[0014] The diameter of the first inner needle core is 0.10 mm to 0.50 mm; the inner diameter of the first elastic solenoid is 0.20 mm to 0.60 mm, and its outer diameter is 0.25 mm to 0.95 mm; the material of the first inner needle core is 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy.

[0015] The diameters of the second and third inner needle cores are 0.20 mm to 0.60 mm; the inner diameter of the second elastic solenoid is 0.25 mm to 0.75 mm, and its outer diameter is 0.30 mm to 1.00 mm; the length of the needle tip of the puncture section is 0.2 mm to 0.3 mm.

[0016] The second and third inner needle cores are made of 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The two-segment puncture needle with guiding function provided by the present invention includes a flexible segment and a puncture segment located on the same straight line. By observing the change in the swing angle of the flexible segment located outside the patient's body, the user can judge and know the swing angle of the puncture segment located inside the patient's body in real time, thereby being able to more accurately judge the puncture angle, lesion location and puncture depth.

[0019] (2) The two-section puncture needle with guiding function provided by the present invention is a device that can help doctors accurately determine the puncture angle, lesion location and puncture depth in the case of puncture surgery guided by image, making the puncture operation more precise, thereby shortening the puncture operation time, reducing the number of image scans during the puncture process and reducing the dose of radiation received by the patient.

[0020] (3) The two-segment puncture needle with guiding function provided by the present invention has an outer contour of the base in the shape of an unfolded three-petaled petal. There is a gap between any two adjacent petals (i.e., two leaf parts). When the user has already inserted the puncture segment of the two-segment puncture needle into the patient's body, the user can insert other puncture needles, ablation needles or auxiliary instruments near the position of the two-segment puncture needle and in the gap between any two adjacent petals (i.e., leaf parts) without interfering with each other.

[0021] (4) The two-segment puncture needle with guiding function provided by the present invention has sufficient flexibility in the flexible segment. Even if the user's hand touches the flexible segment during the use of the two-segment puncture needle, the flexible segment will not damage the user's skin and muscles, thereby ensuring the user's safety.

[0022] (5) The two-segment puncture needle with guiding function provided by the present invention can be applied in a sterile environment to medical operations that require the puncture needle to be inserted into the target site according to a predetermined angle and depth, such as percutaneous tissue biopsy with image guidance, percutaneous microwave ablation, percutaneous radiofrequency ablation, percutaneous argon-helium cryoablation, percutaneous particle implantation, percutaneous intratumoral drug injection, percutaneous hepatic cholangiography and drainage, percutaneous renal pelvis puncture, percutaneous abscess drainage, and percutaneous lesion localization. It can help doctors know in real time how the lesion moves up and down with breathing during the puncture operation, and at the same time, can know in real time the tilt angle of the puncture needle in the cross-section of the human body and the tilt angle along the axis (i.e. towards the head or foot of the patient), so as to solve the problem of lack of precise positioning guidance for puncture operation in the prior art. Attached Figure Description

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Figure 1A three-dimensional schematic diagram of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0025] Figure 2 A partial three-dimensional schematic diagram of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0026] Figure 3 One of the partial explosion diagrams of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0027] Figure 4 A second partial explosion diagram of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0028] Figure 5 A partial schematic diagram of the puncture segment of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0029] Figure 6 One of the partial cross-sectional schematic diagrams of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0030] Figure 7 This is a second partial cross-sectional schematic diagram of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0031] Figure 8 One of the partial cross-sectional schematic diagrams of the base of a two-segment puncture needle with guiding function provided in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram illustrating the usage state of a two-section puncture needle with guiding function provided in an embodiment of the present invention. Detailed Implementation

[0033] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0034] like Figure 1 , Figure 2 As shown, this embodiment provides a two-segment puncture needle with guiding function. The two-segment puncture needle includes a flexible segment 10, a base 20, and a puncture segment 30. Both the flexible segment 10 and the puncture segment 30 are generally elongated needle-shaped, and the outer contour of the base 20 is an unfolded three-petal shape. The inner end of the flexible segment 10 is fixedly connected to one side of the base 20, and the inner end of the puncture segment 30 is fixedly connected to the other side of the base 20. The central axes of the flexible segment 10, the base 20, and the puncture segment 30 are located on the same straight line. The outer contour of the base 20 is not limited to an unfolded three-petal shape, but can also be set to other shapes.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the flexible segment 10 includes a first inner needle core 11 and a first elastic coil 12; the first inner needle core 11 is a slender cylindrical shape, and the interior of the first elastic coil 12 is hollow; the first inner needle core 11 is disposed inside the first elastic coil 12, and the outer diameter of the first inner needle core 11 matches the inner diameter of the first elastic coil 12 so that the first elastic coil 12 is directly wound around the outer circumferential surface of the first inner needle core 11, and the outer end of the first inner needle core 11 (i.e. the end away from the base 20) is flush with the outer end of the first elastic coil 12.

[0036] The first inner needle core 11 is made of a metal alloy, such as 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy. In a preferred embodiment of this example, the length of the flexible segment 10 is, for example, 5cm to 8cm, the diameter of the first inner needle core 11 is, for example, about 0.10mm to 0.50mm, the inner diameter of the first elastic solenoid coil 12 is, for example, 0.20mm to 0.60mm, preferably 0.37mm, and the outer diameter of the first elastic solenoid coil 12 is, for example, 0.25mm to 0.95mm, preferably 0.46mm.

[0037] like Figure 3 , Figure 4 As shown, the base 20 includes a first blade portion 21, a second blade portion 22, a third blade portion 23, and a tubular connecting portion 24; the tubular connecting portion 24 is generally cylindrical, and has a circular stepped hole 25 inside; the first blade portion 21, the second blade portion 22, and the third blade portion 23 are identical, and all three are elongated blade shapes; the stepped hole 25 includes a coaxial first circular hole 25-1 and a second circular hole 25-2, and the diameter of the first circular hole 25-1 is smaller than that of the second circular hole 25-2; the first blade portion 21, the second blade portion 22, the third blade portion 23, and the tubular connecting portion 24 are all cylindrical, and have a circular stepped hole 25 inside ... The inner ends of the first blade 21, the second blade 22, and the third blade 23 are fixedly connected to the outer peripheral surface of the tubular connecting portion 24 in a radial pattern. The first blade 21, the second blade 22, and the third blade 23 are evenly distributed along the outer peripheral surface of the tubular connecting portion 24, such that the included angle between any two of the three blades is 120°. The two side surfaces of the first blade 21, the second blade 22, and the third blade 23 are flush with the end faces of the tubular connecting portion 24, thus forming the two side surfaces of the base 20. The thickness of the base 20 is, for example, 2mm to 3mm, and its material is a metal alloy, such as 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy.

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the puncture section 30 includes a second inner needle core 31, a third inner needle core 32, and a second elastic solenoid coil 33. The second inner needle core 31 and the third inner needle core 32 are identical, and both are slender semi-cylindrical in shape. The interior of the second elastic solenoid coil 33 is hollow. The second inner needle core 31 and the third inner needle core 32 are disposed inside the second elastic solenoid coil 33, and the second inner needle core 31 and the third inner needle core 32 are assembled to form a cylindrical needle core. The outer diameter of the second inner needle core 31 and the third inner needle core 32 is equal to that of the second elastic solenoid coil 33. The inner diameters of the coils 33 are matched so that the second elastic solenoid coil 33 is directly wound around the outer circumferential surfaces of the second inner needle core 31 and the third inner needle core 32. A first half-needle tip 34-1 is provided at the end of the second inner needle core 31 (i.e., the end furthest from the base 20), and a second half-needle tip 34-2 is provided at the end of the third inner needle core 32 (i.e., the end furthest from the base 20). The first half-needle tip 34-1 and the second half-needle tip 34-2 combine to form the needle tip 34 of the puncture section 30. The needle tip 34 is conical and extends from the end of the second elastic solenoid coil 33. The second inner needle core 31 and the third inner needle core 32 are made of metal alloys, such as 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy. In a preferred embodiment of this example, the length of the puncture section 30 is, for example, 8cm to 12cm; the diameters of the second inner needle core 31 and the third inner needle core 32 are, for example, 0.20mm to 0.60mm; the inner diameter of the second elastic solenoid coil 33 is, for example, 0.25mm to 0.75mm; the outer diameter of the second elastic solenoid coil 33 is, for example, 0.30mm to 1.00mm; and the length of the needle tip 34 of the puncture section 30 is, for example, 0.2mm to 0.3mm.

[0039] like Figure 1 , Figure 6 , Figure 7 , Figure 8As shown, in a preferred embodiment of this example, the inner end of the flexible segment 10 is fixedly connected to one side of the base 20, and the inner end of the puncture segment 30 is fixedly connected to the other side of the base 20. Specifically, the outer diameter of the inner end of the flexible segment 10 matches the inner diameter of the first circular hole 25-1 of the tubular connecting portion 24 of the base 20, and the inner end of the flexible segment 10 is disposed within the first circular hole 25-1, thus fixing the inner end of the flexible segment 10 to the base 20. The outer diameter of the inner end of the puncture segment 30 matches the inner diameter of the second circular hole 25-2 of the tubular connecting portion 24 of the base 20, and the inner end of the puncture segment 30 is disposed within the second circular hole 25-2, thus fixing the inner end of the puncture segment 30 to the base 20. The stepped hole 25 of the tubular connecting portion 24 of the base 20 is used to fix the flexible segment 10 and the puncture segment 30 with different diameters, and the stepped hole 25 structure enables precise positioning and stable connection of the puncture needle. The 20 clover-shaped base has evenly distributed leaves, which not only enhances the aesthetics of the base but also optimizes the stress distribution and strengthens the overall structural stability and load-bearing capacity.

[0040] Basic procedure: Preoperatively, the target site for puncture is determined based on imaging assessments such as enhanced CT scans. After scanning with imaging equipment (CT, digital subtraction angiography, or MRI), the puncture point, angle, and depth are determined. First, with the assistance of an angle sensor, the guide needle is inserted within 1 cm of the puncture point, and puncture is performed according to the determined angle and depth. Second, another imaging scan is performed to determine the position of the guide needle tip relative to the lesion. Based on the guide needle's movement with respiration and its position relative to the lesion, puncture is performed, and with the assistance of the angle sensor, the needle is inserted to the vicinity of the target lesion at the predetermined angle and depth. Finally, another imaging scan is performed to confirm that the needle has reached the puncture site and is ultimately inserted into the lesion.

[0041] like Figure 9 As shown, in use, the user (e.g., a healthcare worker) inserts the puncture segment 30 of the two-segment puncture needle of this embodiment into the patient's body. During this process, the patient will continuously breathe, and the patient's breathing is likely to cause the puncture segment 30 located inside the patient's body to swing or sway to a certain extent. The swing or sway of the puncture segment 30 will cause the flexible segment 10 located outside the patient's body to swing or sway to a corresponding extent. For example, the initial position of the puncture segment 30 and the flexible segment 10 is at the AB line position. The patient's breathing causes the puncture segment 30 and the flexible segment 10 to swing to the CD line position. The angle between the AB line and the CD line is θ. By observing the change in the swing angle θ of the flexible segment 10 located outside the patient's body, the user can judge and know the swing angle of the puncture segment 30 located inside the patient's body in real time, thereby assisting the user to adjust the puncture operation in real time.

[0042] In this embodiment of the two-segment puncture needle, the base 20 has an outer contour that resembles an unfolded three-petal shape, with gaps between any two adjacent petals (i.e., two leaf-shaped portions). This allows the user to insert other puncture needles, ablation needles, or auxiliary instruments near the two-segment puncture needle and within the gaps between any two adjacent petals (i.e., leaf-shaped portions) without interference. Furthermore, the base 20 of this embodiment acts as a limiting element during needle insertion; when the puncture segment 30 is fully inserted into the patient's body, the base 20's obstruction restricts further needle insertion.

[0043] In addition, the flexible segment 10 of the two-segment puncture needle in this embodiment has a certain degree of flexibility. During the use of the two-segment puncture needle, even if the user's hand touches the flexible segment 10, the flexible segment 10 will not damage the user's skin and muscles, thereby ensuring the user's safety.

Claims

1. A two-stage puncture needle with guiding function, characterized in that, The two-section puncture needle includes a flexible section (10) and a puncture section (30); both the flexible section (10) and the puncture section (30) are slender needle-shaped; one end of the flexible section (10) is fixedly connected to one end of the puncture section (30), and their central axes are on the same straight line; the flexible section (10) has sufficient flexibility to ensure that the flexible section (10) will not damage the skin and muscles of the user's hand when the user's hand touches the flexible section (10).

2. The two-segment puncture needle with guiding function according to claim 1, characterized in that, The two-section puncture needle also includes a base (20); the inner end of the flexible section (10) is fixedly connected to one side of the base (20), and the inner end of the puncture section (30) is fixedly connected to the other side of the base (20); the central axes of the flexible section (10), the base (20) and the puncture section (30) are on the same straight line; the base (20) can play a limiting role during needle insertion.

3. The two-segment puncture needle with guiding function according to claim 1 or 2, characterized in that, The flexible segment (10) includes a first inner needle core (11) and a first elastic coil (12); the first inner needle core (11) is a slender cylindrical shape, and the interior of the first elastic coil (12) is hollow; the first inner needle core (11) is disposed inside the first elastic coil (12), and the outer diameter of the first inner needle core (11) matches the inner diameter of the first elastic coil (12) so that the first elastic coil (12) is directly wound around the outer circumferential surface of the first inner needle core (11), and the outer end of the first inner needle core (11) is flush with the outer end of the first elastic coil (12).

4. The two-segment puncture needle with guiding function according to claim 1 or 2, characterized in that, The puncture section (30) includes a second inner needle core (31), a third inner needle core (32), and a second elastic coil (33). The second inner needle core (31) and the third inner needle core (32) are identical, and both the second inner needle core (31) and the third inner needle core (32) are slender semi-cylindrical in shape. The interior of the second elastic coil (33) is hollow. The second inner needle core (31) and the third inner needle core (32) are disposed inside the second elastic coil (33). The second inner needle core (31) and the third inner needle core (32) are assembled to form a cylindrical needle core. The outer diameter of the core (32) matches the inner diameter of the second elastic coil (33), so that the second elastic coil (33) is directly wound around the outer circumferential surface of the second inner needle core (31) and the third inner needle core (32); the end of the second inner needle core (31) is provided with a first half needle tip (34-1), and the end of the third inner needle core (32) is provided with a second half needle tip (34-2). The first half needle tip (34-1) and the second half needle tip (34-2) are combined to form the needle tip (34) of the puncture section (30). The needle tip (34) is conical and extends from the end of the second elastic coil (33).

5. The two-segment puncture needle with guiding function according to claim 2, characterized in that, The outer contour of the base (20) is an unfolded three-petal shape; the base (20) includes a first blade portion (21), a second blade portion (22), a third blade portion (23), and a tubular connecting portion (24); the tubular connecting portion (24) is cylindrical in shape, and has a circular stepped hole (25) inside; the first blade portion (21), the second blade portion (22), and the third blade portion (23) are the same, and all three are slender blade shapes; the stepped hole (25) includes a coaxial first circular hole (25-1) and a second circular hole (25-2), and the diameter of the first circular hole (25-1) is smaller than that of the second circular hole (25-2); the first blade portion (21), the second blade portion (22), the third blade portion (23), and the tubular connecting portion (24) are cylindrical in shape, and have ... cylindrical in shape, and have a circular stepped hole (25-2) inside; the first blade portion (21), the second blade portion (22), and the third blade portion (23) are cylindrical in shape, and have a circular stepped hole (25-2) inside; the first blade portion (21), the second blade portion (22), and the third blade portion (23) are cylindrical in shape, and have a circular The inner ends of the blade portion (22) and the third blade portion (23) are fixedly connected to the outer peripheral surface of the tubular connecting portion (24) in a radial pattern, and the first blade portion (21), the second blade portion (22) and the third blade portion (23) are evenly distributed along the outer peripheral surface of the tubular connecting portion (24), such that the included angle between any two of the first blade portion (21), the second blade portion (22) and the third blade portion (23) is 120°; a gap is provided between any two adjacent blade portions; the two sides of the first blade portion (21), the second blade portion (22) and the third blade portion (23) are respectively flush with the two end faces of the tubular connecting portion (24), thereby forming the two sides of the base (20).

6. The two-segment puncture needle with guiding function according to claim 5, characterized in that, The stepped hole (25) of the tubular connecting part (24) of the base (20) is used to fix the flexible segment (10) and the puncture segment (30) with different diameters. The outer diameter of the inner end of the flexible segment (10) matches the inner diameter of the first circular hole (25-1) of the tubular connecting part (24) of the base (20), and the inner end of the flexible segment (10) is disposed in the first circular hole (25-1), so that the inner end of the flexible segment (10) is fixedly connected to the base (20). The outer diameter of the inner end of the puncture segment (30) matches the inner diameter of the second circular hole (25-2) of the tubular connecting part (24) of the base (20), and the inner end of the puncture segment (30) is disposed in the second circular hole (25-2), so that the inner end of the puncture segment (30) is fixedly connected to the base (20).

7. The two-segment puncture needle with guiding function according to claim 1 or 2, characterized in that, The flexible segment (10) has a length of 5cm to 8cm; the puncture segment (30) has a length of 8cm to 12cm; and the base (20) has a thickness of 0.5mm to 5mm.

8. The two-segment puncture needle with guiding function according to claim 3, characterized in that, The diameter of the first inner needle core (11) is 0.10 mm to 0.50 mm; the inner diameter of the first elastic solenoid coil (12) is 0.20 mm to 0.60 mm, and its outer diameter is 0.25 mm to 0.95 mm; the material of the first inner needle core (11) is 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy.

9. The two-segment puncture needle with guiding function according to claim 4, characterized in that, The diameters of the second inner needle core (31) and the third inner needle core (32) are 0.20 mm to 0.60 mm; the inner diameter of the second elastic coil (33) is 0.25 mm to 0.75 mm, and its outer diameter is 0.30 mm to 1.00 mm; the length of the needle tip (34) of the puncture section (30) is 0.2 mm to 0.3 mm.

10. The two-segment puncture needle with guiding function according to claim 9, characterized in that, The second inner needle core (31) and the third inner needle core (32) are made of 316LVM stainless steel, nickel-titanium alloy, or platinum-iridium alloy.

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