Ultrasonic guidewire

Abstract

The present invention provides an ultrasonic guidewire, which relates to the technical field of medical devices. The ultrasonic guidewire provided by the present invention includes: a handle, a variable amplitude rod, a transducer part and an implant part; the transducer part is installed inside the handle, the variable amplitude rod part is inserted inside the handle, and the variable amplitude rod part is connected to the transducer part; the proximal end of the implant part is connected to the variable amplitude rod part, and the lengths of the variable amplitude rod part and the implant part are both odd multiples of one-quarter of the excitation energy frequency, so that the distal end of the ultrasonic guidewire can obtain a larger ultrasonic amplitude, thereby obtaining a better cavitation effect, and having a better and more significant effect on treating blocked blood vessels and calcified tissue.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an ultrasonic guidewire. Background Art

[0002] When coronary artery disease develops to a certain stage, with severe or complete occlusion, revascularization treatment, such as bypass surgery or PCI, is usually necessary. However, due to the small amplitude of the ultrasound guidewire implanted in the body, amplitudes greater than 100μm have not been achieved, resulting in limited cavitation effects and a weak therapeutic effect on blocked blood vessels and calcified tissue. Summary of the Invention

[0003] The object of the present invention is to provide an ultrasonic guidewire to alleviate the technical problems of small transmission amplitude and poor cavitation effect of the ultrasonic guidewire.

[0004] In a first aspect, the present invention provides an ultrasonic guidewire comprising: a handle, a variable amplitude rod, a transducer portion, and an implant portion;

[0005] The energy conversion part is installed inside the handle, the amplitude changing rod is inserted inside the handle, and the amplitude changing rod is connected to the energy conversion part;

[0006] The proximal end of the implant portion is connected to the amplitude variation rod, and the lengths of the amplitude variation rod and the implant portion are both odd multiples of a quarter of the excitation energy frequency.

[0007] In combination with the first aspect, the present invention provides a first possible implementation of the first aspect, wherein the implant portion includes: a first component, an ultrasonic therapy head, and at least one second component;

[0008] The amplitude-changing rod, the first component, at least one of the second components, and the ultrasonic treatment head are connected end to end in sequence from the proximal end to the distal end;

[0009] The lengths of the first component, the second component and the ultrasonic treatment head are all integer multiples of one quarter of the excitation energy frequency.

[0010] In combination with the first possible implementation of the first aspect, the present invention provides a second possible implementation of the first aspect, wherein the implant part also includes an outer tube, the first component is coaxial with the outer tube, and a plurality of second components are installed inside the outer tube, and the plurality of second components are arranged at intervals along the circumferential direction of the outer tube.

[0011] In combination with the first possible implementation of the first aspect, the present invention provides a third possible implementation of the first aspect, wherein a side notch is provided on the circumferential surface of the ultrasonic treatment head;

[0012] The side notch extends along the circumference of the ultrasonic treatment head;

[0013] Alternatively, there are a plurality of side notches, and the plurality of side notches are spaced apart along the circumference of the ultrasonic therapy head.

[0014] In combination with the first aspect, the present invention provides a fourth possible implementation of the first aspect, wherein the amplitude varying rod member includes: a first amplitude varying rod and a second amplitude varying rod;

[0015] The energy conversion part is connected to the first horn, the first horn and the second horn are coaxial, and the proximal end of the second horn is connected to the distal end of the first horn;

[0016] In the assembled state, the overall length of the first horn and the second horn is an odd multiple of one quarter of the excitation energy frequency.

[0017] In combination with the fourth possible implementation manner of the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the first horn includes: a first shaft segment, a first shaft shoulder segment, a second shaft segment, a third shaft segment, and a fourth shaft segment;

[0018] The first shaft segment, the first shaft shoulder segment, the second shaft segment, the third shaft segment and the fourth shaft segment are coaxial and sequentially connected, and the proximal end of the fourth shaft segment is inserted into the proximal end of the second horn;

[0019] The diameter of the first shaft shoulder segment is larger than the diameter of the first shaft segment, and the diameter of the third shaft segment is larger than the diameter of the fourth shaft segment;

[0020] The energy conversion portion is mounted on the first shaft segment and / or the fourth shaft segment.

[0021] In combination with the fourth possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein the second horn includes: a second shaft shoulder segment, a fifth shaft segment, a sixth shaft segment, a third shaft shoulder segment, and a seventh shaft segment;

[0022] The third shaft shoulder section is connected to the sixth shaft rod section, and the third shaft shoulder section is coaxial with the sixth shaft rod section;

[0023] The second shaft shoulder segment, the fifth shaft segment, the sixth shaft segment and the seventh shaft segment are coaxial and sequentially connected.

[0024] In combination with the fifth possible implementation manner of the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein the transducer portion includes: a first electrode, a second electrode, and a first ultrasonic transducer;

[0025] The first ultrasonic transducer is sleeved on the first shaft segment, and the first ultrasonic transducer is separated between the first electrode and the second electrode.

[0026] In combination with the seventh possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the transducer portion includes: a third electrode, a fourth electrode, and a second ultrasonic transducer;

[0027] The second ultrasonic transducer is sleeved on the fourth shaft segment, and the second ultrasonic transducer is separated between the third electrode and the fourth electrode.

[0028] In combination with the seventh possible implementation of the first aspect, the present invention provides a ninth possible implementation of the first aspect, wherein a preload is installed at the proximal end of the first shaft segment, and the first ultrasonic transducer is pressed between the preload and the first shoulder segment.

[0029] The embodiments of the present invention bring the following beneficial effects: the transducer part is installed inside the handle, the amplitude variation rod is inserted inside the handle, and the amplitude variation rod is connected to the transducer part, the proximal end of the implant part is connected to the amplitude variation rod, and the lengths of the amplitude variation rod and the implant part are both odd multiples of one-quarter of the excitation energy frequency, so that the distal end of the ultrasonic guidewire can obtain a larger ultrasonic amplitude, thereby obtaining a better cavitation effect, and the effect on treating blocked blood vessels and calcified tissue is more significant.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A cross-sectional view of an ultrasonic guidewire provided in an embodiment of the present invention;

[0033] Figure 2 An exploded view of the amplitude variation rod, energy conversion portion, implant portion, and pre-tightening member of the ultrasonic guidewire provided in an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of an implantable portion of an ultrasound guidewire provided in an embodiment of the present invention;

[0035] Figure 4A schematic diagram of a variable amplitude rod of an ultrasonic guidewire provided in an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the amplitude variation rod, the energy conversion part, and the implantation part of the ultrasonic guidewire provided in an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a first ultrasonic therapy tip of an ultrasonic guidewire provided in an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a second ultrasonic treatment head of an ultrasonic guidewire provided in an embodiment of the present invention;

[0039] Figure 8 A schematic diagram of a third ultrasonic treatment tip of an ultrasonic guidewire provided in an embodiment of the present invention;

[0040] Figure 9 A schematic diagram of a fourth ultrasonic therapy head of an ultrasonic guidewire provided in an embodiment of the present invention.

[0041] Icons: 100 - handle; 200 - horn member; 201 - first heat shrink tube; 202 - second heat shrink tube; 210 - first horn; 211 - first shaft section; 212 - first shoulder section; 213 - second shaft section; 214 - third shaft section; 215 - fourth shaft section; 220 - second horn; 221 - second shoulder section; 222 - fifth shaft section; 223 - sixth shaft section; 224 - third shoulder section; 225 - seventh shaft section; 300 - transducer part; 310 - first electrode; 320 - second electrode; 330 - first ultrasonic transducer; 340 - third electrode; 350 - fourth electrode; 360 - second ultrasonic transducer; 400 - implant part; 410 - first component; 420 - second component; 430 - ultrasonic treatment head; 431 - side notch; 432 - axial opening; 440 - outer tube; 450 - connector; 500 - pre-tightening member; 510 - pre-tightening bolt; 520 - spacer. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, unless separately marked, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0045] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the ultrasonic guidewire provided by an embodiment of the present invention includes: a handle 100, a variable amplitude rod 200, a transducer part 300 and an implant part 400; the transducer part 300 is installed inside the handle 100, the variable amplitude rod 200 is inserted inside the handle 100, and the variable amplitude rod 200 is connected to the transducer part 300; the proximal end of the implant part 400 is connected to the variable amplitude rod 200, and the lengths of the variable amplitude rod 200 and the implant part 400 are both odd multiples of one-quarter of the excitation energy frequency.

[0046] Specifically, the transducer 300 is connected to a power source via a wire. When powered, it generates a high-frequency excitation signal, which is converted into mechanical vibrations and transmitted sequentially along the horn 200 and the implant 400. When the lengths of the horn 200 and the implant 400 are both one-quarter of the excitation energy frequency, the amplitude transmitted to the distal end of the implant 400 is maximized, resulting in a more effective cavitation effect and a more significant therapeutic effect on blocked blood vessels and calcified tissue.

[0047] It should be noted that previous ultrasonic guidewires could only achieve vibrations with an amplitude of less than 100 μm. The ultrasonic guidewire described in the embodiment of this application can achieve 30 KHz and 120 μm amplitude, which has a larger amplitude and better cavitation effect.

[0048] like Figure 1 、 Figure 2 、 Figure 3 and Figure 5 As shown, in this embodiment of the present invention, the implant 400 includes: a first component 410, an ultrasonic therapy tip 430, and at least one second component 420. The amplitude-modulating rod 200, the first component 410, the at least one second component 420, and the ultrasonic therapy tip 430 are connected end-to-end from the proximal end to the distal end. The lengths of the first component 410, the second component 420, and the ultrasonic therapy tip 430 are all integer multiples of one-quarter of the excitation energy frequency. The first component 410 transmits vibrations from the amplitude-modulating rod 200 to the ultrasonic therapy tip 430 via the second component 420. The ultrasonic therapy tip 430 then transmits the mechanical vibration energy to the surrounding tissue, thereby treating the lesion. Both the first component 410 and the second component 420 are made of titanium alloy or aircraft aluminum and are configured as a rod-shaped structure.

[0049] Compared with the technical solution of providing one vibration transmission component, providing the first component 410 and the second component 420 can reduce the difficulty of processing, facilitate the replacement of components of different specifications, and have better bendability.

[0050] refer to Figure 1 and Figure 2 The number of second components 420 is 3, and the implant part 400 also includes an outer tube 440 and a connector 450. The outer tube 440 has a three-cavity cylindrical structure. The three second components 420 are respectively arranged in the three inner cavities of the outer tube 440. The proximal end of the connector 450 has a first socket, and the first component 410 is inserted into the first socket; the distal end of the connector 450 has a second socket, and the outer tube 440 and the three second components 420 are inserted into the second socket.

[0051] In an alternative embodiment, there is only one second member 420. Unlike the first embodiment, the proximal end of the connector 450 has a first receptacle into which the first member 410 is inserted, and the distal end of the connector 450 has a second receptacle into which the second member 420 is inserted. Furthermore, the first member 410 and the second member 420 can each be connected to the connector 450 using threads, riveting, or adhesive bonding.

[0052] In another alternative embodiment, the number of second components 420 is 5, the implant part 400 also includes an outer tube 440, the first component 410 is coaxial with the outer tube 440, and 4 second components 420 are installed inside the outer tube 440. The 4 second components 420 are arranged at intervals along the circumferential direction of the outer tube 440.

[0053] Furthermore, the outer tube 440 is sleeved outside the first component 410 and the second component 420. The outer tube 440 limits the first component 410 and the second component 420, thereby preventing the first component 410, the second component 420 and the connecting head 450 from bending or breaking.

[0054] like Figure 2 、 Figure 3 、 Figure 6 and Figure 9 As shown, a side notch 431 is provided on the circumferential surface of the ultrasonic treatment head 430. There are multiple side notches 431, and the multiple side notches 431 are arranged at intervals along the circumference of the ultrasonic treatment head 430. Mechanical vibration energy is transmitted outward through the multiple side notches 431, thereby improving the cavitation effect.

[0055] like Figure 2 、 Figure 3 and Figure 7 As shown, the side notch 431 is an annular groove extending along the circumference of the ultrasonic therapy head 430 . The ultrasonic vibration energy is transmitted radially outward along the ultrasonic therapy head 430 through the side notch 431 , thereby forming a cavitation effect along the circumference of the ultrasonic therapy head 430 .

[0056] like Figure 2 、 Figure 3 and Figure 8 As shown, the ultrasonic therapy head 430 is further provided with an axial opening 432 , which faces the distal end of the ultrasonic therapy head 430 . Ultrasonic vibration energy is transmitted outward through the axial opening 432 , thereby forming a cavitation effect transmitted axially along the ultrasonic therapy head 430 .

[0057] like Figure 1 、 Figure 2 and Figure 5 As shown, the amplitude transformer component 200 includes: a first amplitude transformer 210 and a second amplitude transformer 220; the energy conversion part 300 is connected to the first amplitude transformer 210, the first amplitude transformer 210 and the second amplitude transformer 220 are coaxial, and the proximal end of the second amplitude transformer 220 is connected to the distal end of the first amplitude transformer 210; in the assembled state, the overall length of the first amplitude transformer 210 and the second amplitude transformer 220 is an odd multiple of one-quarter of the excitation energy frequency.

[0058] Specifically, the first amplitude transformer 210 and the second amplitude transformer 220 achieve amplification and transmission of high-frequency vibration amplitude through changes in interface area. The change in amplitude is mainly achieved through the ratio of cross-sectional areas. The first amplitude transformer 210 and the second amplitude transformer 220 can be configured as a catenary type, an exponential type, a straight type, a conical type or a hyperbolic type. At the same amplitude multiple, the catenary type has a more gentle stress during high-frequency vibration, and is not prone to stress concentration that causes the amplitude transformer to break; the straight type is prone to stress concentration at the transition point between two different areas, and this amplitude transformer is more suitable for relatively lower frequency vibrations; the conical and hyperbolic amplitude transformers have transitions in the diameter change, which can avoid the influence of stress concentration on structural stability.

[0059] like Figure 1 、 Figure 2 and Figure 4 As shown, the first amplitude transformer 210 includes: a first shaft segment 211, a first shaft shoulder segment 212, a second shaft segment 213, a third shaft segment 214 and a fourth shaft segment 215; the first shaft segment 211, the first shaft shoulder segment 212, the second shaft segment 213, the third shaft segment 214 and the fourth shaft segment 215 are coaxial and connected in sequence, and the proximal end of the fourth shaft segment 215 is inserted into the proximal end of the second amplitude transformer 220; the diameter of the first shaft shoulder segment 212 is larger than the diameter of the first shaft segment 211, and the diameter of the third shaft segment 214 is larger than the diameter of the fourth shaft segment 215; the energy conversion part 300 is installed on the first shaft segment 211 and / or the fourth shaft segment 215.

[0060] Among them, the first shaft segment 211 is sleeved with a first heat shrink tube 201, the fourth shaft segment 215 is sleeved with a second heat shrink tube 202, and the third shaft segment 214 can be provided with a first installation slot. When installing the first amplitude rod 210, the limiting piece of the handle 100 is inserted into the first installation slot, thereby achieving clamping and fixing of the first amplitude rod 210.

[0061] Furthermore, a pre-tightening member 500 is mounted at the proximal end of the first shaft segment 211. The first ultrasonic transducer 330 is compressed between the pre-tightening member 500 and the first shaft shoulder segment 212. The pre-tightening member 500 may include a pre-tightening bolt 510 connected to the first shaft segment 211. By tightening the first shaft segment 211, the transducer portion 300 is brought into close contact with the first shaft shoulder segment 212, thereby ensuring that the ultrasonic vibration generated by the transducer portion 300 can be efficiently transmitted to the first horn 210. Furthermore, the pre-tightening member 500 also includes a spacer 520, which is located between the pre-tightening bolt 510 and the first ultrasonic transducer 330. The spacer 520 prevents direct contact between the pre-tightening bolt 510 and the first ultrasonic transducer 330, thereby preventing damage to the piezoelectric ceramic transducer due to pressure.

[0062] Furthermore, the second horn 220 includes a second shoulder section 221, a fifth shaft section 222, a sixth shaft section 223, a third shoulder section 224, and a seventh shaft section 225. The third shoulder section 224 is connected to the sixth shaft section 223 and is coaxial with the sixth shaft section 223. The second shoulder section 221, the fifth shaft section 222, the sixth shaft section 223, and the seventh shaft section 225 are coaxial and sequentially connected. The proximal ends of the second shoulder section 221 and the fifth shaft section 222 have holes extending along the axis, and the fourth shaft section 215 is inserted into these holes and secured by welding, threading, or gluing.

[0063] Furthermore, the transducer part 300 includes: a first electrode 310, a second electrode 320 and a first ultrasonic transducer 330; the first ultrasonic transducer 330 is sleeved on the first shaft section 211, and the first ultrasonic transducer 330 is separated between the first electrode 310 and the second electrode 320, and the first electrode 310 and the second electrode 320 are connected to a high-frequency power supply through a cable.

[0064] In addition, the transducer portion 300 may further include: a third electrode 340 , a fourth electrode 350 and a second ultrasonic transducer 360 ; the second ultrasonic transducer 360 is sleeved on the fourth shaft segment 215 , and the second ultrasonic transducer 360 is separated between the third electrode 340 and the fourth electrode 350 .

[0065] Specifically, the first electrode 310, the second electrode 320, the third electrode 340, and the fourth electrode 350 each comprise a plurality of annular electrode sheets, with adjacent pairs of electrode sheets connected by an axially extending conductor. The plurality of annular electrode sheets are sleeved onto the amplitude transformer 200. The first ultrasonic transducer 330 and the second ultrasonic transducer 360 each utilize stacked piezoelectric ceramic rings, with adjacent pairs of annular electrode sheets separated by a piezoelectric ceramic ring. A second mounting notch is provided on the sixth shaft segment 223. During assembly, the retaining member of the handle 100 is inserted into the second mounting notch, thereby clamping and securing the amplitude transformer 200. By tightening the preload member 500, the first ultrasonic transducer 330 and the second ultrasonic transducer 360 are each brought into close contact with the amplitude transformer 200, thereby efficiently transmitting mechanical vibration to the amplitude transformer 200.

[0066] See also Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the wavelength is λ. L2 and L4 are the axial lengths of the piezoelectric ceramic, and their lengths are even multiples of λ / 4. The vibration amplitude at the contact end of segment L2 and segment L3 is the largest. L5 is an odd multiple of λ / 4, with the smallest amplitude at the end. L1 is an odd multiple of λ / 4, with the largest amplitude at the end. L3 is an even multiple of λ / 4. L4 = even multiples of 1 / 4λ; L5 = odd multiples of 1 / 4λ; L6 = odd multiples of 1 / 4λ; and L7 = odd multiples of 1 / 4λ. Stress is most concentrated where the vibration amplitude is greatest. Stress transition structures are required at these locations to prevent breakage during operation.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic guidewire, characterized in that: include: A handle (100), a variable amplitude rod (200), an energy conversion portion (300), and an implant portion (400); The energy conversion part (300) is installed inside the handle (100), the amplitude changing rod (200) is inserted inside the handle (100), and the amplitude changing rod (200) is connected to the energy conversion part (300); The proximal end of the implant portion (400) is connected to the amplitude-changing rod (200), and the lengths of the amplitude-changing rod (200) and the implant portion (400) are both odd multiples of a quarter of the excitation energy frequency; The implant portion (400) comprises: a first component (410), an ultrasonic treatment head (430), and at least one second component (420); the amplitude-changing rod (200), the first component (410), the at least one second component (420), and the ultrasonic treatment head (430) are connected in sequence from the proximal end to the distal end; the lengths of the first component (410), the second component (420), and the ultrasonic treatment head (430) are all integer multiples of one-quarter of the excitation energy frequency; The implant portion (400) further includes an outer tube (440), the first member (410) is coaxial with the outer tube (440), a plurality of second members (420) are installed inside the outer tube (440), and the plurality of second members (420) are spaced apart along the circumferential direction of the outer tube (440); A side notch (431) is provided on the circumferential surface of the ultrasonic treatment head (430); The side notch (431) extends along the circumference of the ultrasonic treatment head (430); Alternatively, a plurality of the side notches (431) are provided, and the plurality of side notches (431) are spaced apart along the circumference of the ultrasonic treatment head (430).

2. The ultrasonic guidewire according to claim 1, characterized in that The amplitude-changing rod member (200) comprises: a first amplitude-changing rod (210) and a second amplitude-changing rod (220); The energy conversion part (300) is connected to the first horn (210), the first horn (210) and the second horn (220) are coaxial, and the proximal end of the second horn (220) is connected to the distal end of the first horn (210); In an assembled state, the overall length of the first horn (210) and the second horn (220) is an odd multiple of one quarter of the excitation energy frequency.

3. The ultrasonic guidewire according to claim 2, characterized in that The first amplitude transformer (210) comprises: a first shaft section (211), a first shaft shoulder section (212), a second shaft section (213), a third shaft section (214), and a fourth shaft section (215); The first shaft section (211), the first shaft shoulder section (212), the second shaft section (213), the third shaft section (214) and the fourth shaft section (215) are coaxial and sequentially connected, and the proximal end of the fourth shaft section (215) is inserted into the proximal end of the second amplitude rod (220); The diameter of the first shaft shoulder section (212) is greater than the diameter of the first shaft section (211), and the diameter of the third shaft section (214) is greater than the diameter of the fourth shaft section (215); The energy conversion portion (300) is mounted on the first shaft segment (211) and / or the fourth shaft segment (215).

4. The ultrasonic guidewire according to claim 2, characterized in that The second amplitude changing rod (220) comprises: a second shaft shoulder section (221), a fifth shaft section (222), a sixth shaft section (223), a third shaft shoulder section (224), and a seventh shaft section (225); The third shaft shoulder section (224) is connected to the sixth shaft rod section (223), and the third shaft shoulder section (224) and the sixth shaft rod section (223) are coaxial; The second shaft shoulder segment (221), the fifth shaft segment (222), the sixth shaft segment (223), and the seventh shaft segment (225) are coaxial and connected in sequence.

5. The ultrasonic guidewire according to claim 3, characterized in that The transducer portion (300) comprises: a first electrode (310), a second electrode (320) and a first ultrasonic transducer (330); The first ultrasonic transducer (330) is sleeved on the first shaft section (211), and the first ultrasonic transducer (330) is separated between the first electrode (310) and the second electrode (320).

6. The ultrasonic guidewire according to claim 5, characterized in that The transducer portion (300) comprises: a third electrode (340), a fourth electrode (350) and a second ultrasonic transducer (360); The second ultrasonic transducer (360) is sleeved on the fourth shaft section (215), and the second ultrasonic transducer (360) is separated between the third electrode (340) and the fourth electrode (350).

7. The ultrasonic guidewire according to claim 5, characterized in that A pre-tightening member (500) is installed at the proximal end of the first shaft section (211), and the first ultrasonic transducer (330) is pressed between the pre-tightening member (500) and the first shaft shoulder section (212).

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