WO2023097784A1 - Dual-frequency endoscopic catheter and imaging device - Google Patents

Abstract

A dual-frequency endoscopic catheter (133) and an imaging device. Two ultrasonic transducers (17, 18) are placed in a catheter in a set arrangement manner, and the two ultrasonic transducers (17, 18) can transmit and receive ultrasonic pulses simultaneously or in a delayed mode, and can independently transmit and receive the ultrasonic pulses. Array elements with two resolution capabilities are organically combined to provide a high-quality ultrasonic dual-frequency fusion image. A matching layer of the dual-frequency ultrasonic transducers (17, 18) is manufactured in a high-precision coating manner by using an artificial matching layer structure (26) with three or more layers of a correlation theory and simulation design, and the output bandwidth and the response amplitude of the ultrasonic transducers (17, 18) are effectively improved.

Description

A dual-frequency endoscopic catheter and imaging device technical field

The invention relates to the technical field of medical device design, in particular to a dual-frequency endoscopic catheter and an imaging device. The imaging device can be applied not only in the cardiovascular system, but also in the auxiliary diagnosis of the upper and lower digestive tracts.

Background technique

At present, the commonly used clinical cardiovascular diagnostic techniques mainly include: Computed Tomography (CT for short) and Magnetic Resonance Imaging (MRI for short), but for the evaluation of coronary artery disease and percutaneous coronary intervention Guidance requires a more precise imaging device.

Intravascular Optical Coherence Tomography Tomography (IVOCT for short) combines endoscopic and laparoscopic techniques on the basis of traditional OCT, which can provide higher-resolution tomographic imaging, thereby improving the accuracy of cardiovascular disease diagnosis; however, OCT optical imaging is due to the highlight of soft tissue Absorption and scattering properties, which reduce the imaging depth. Second, additional surgical risks are added due to the necessary blood flushing step.

Intravascular Ultrasound (IVUS) has been widely used in imaging cardiovascular diseases based on atherosclerosis and coronary stents.

However, the ultrasonic transducer frequency of the traditional IVUS imaging catheter is fixed at 20MHz-40MHz, which can only provide specific axial resolution, lateral resolution and imaging depth; A compromise has been made between the two aspects of depth, so it is impossible to distinguish fine structures such as the fibrous cap of the cardiovascular wall (the size is about 65um), which limits its ability to image cardiovascular structures and tiny plaques, so it is difficult to detect diseased tissues. Multi-level accurate diagnosis.

In recent years, the University of Southern California has developed a multimodal catheter for cardiovascular endoscopic imaging. While optical coherence tomography is used for high-resolution imaging, ultrasound transducers are used for large-depth imaging.

technical problem

However, optical coherence tomography sacrifices imaging depth while providing high-resolution imaging, and has to introduce a flushing device; moreover, these studies all use multi-system coupling, which makes the device more complex and enables high-quality The cost of the image is greatly increased.

technical solution

In view of this, in order to solve the above problems, the present invention provides a dual-frequency endoscopic catheter and imaging device, the technical solution is as follows:

A dual-frequency endoscopic catheter, the dual-frequency endoscopic catheter includes:

shell;

a driving component located on one side of the housing, the driving component is used to drive the housing to rotate;

The sidewall of the housing has an open area;

a first ultrasonic transducer and a second ultrasonic transducer located in the opening area and arranged in sequence along the first direction;

Wherein, the first direction is the same as the length extension direction of the housing.

Preferably, in the aforementioned dual-frequency endoscopic catheter, the frequency of the first ultrasonic transducer is less than or equal to 40 MHz;

The frequency of the second ultrasonic transducer is greater than 40MHz.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the dual-frequency endoscopic catheter further includes:

a base located in the opening area, and the base is fixedly connected to the housing;

The first ultrasonic transducer and the second ultrasonic transducer are fixed on the base.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the side of the casing facing away from the driving part is in the shape of a bullet.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the driving component is a torque coil;

The number of coil layers of the torque coil is at least two layers.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the dual-frequency endoscopic catheter further includes:

a first coaxial cable connected to the first ultrasonic transducer;

A second coaxial cable connected to the second ultrasonic transducer.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the structure of the first ultrasonic transducer and the second ultrasonic transducer is the same, including:

backing layer;

In the second direction, the first electrode layer, the piezoelectric layer, the second electrode layer and at least three successively stacked acoustic artificial matching laminates on one side of the backing layer;

Wherein, the second direction is perpendicular to the backing layer, and is directed from the backing layer to the first electrode layer.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, the structure of the first ultrasonic transducer and the second ultrasonic transducer are the same, further comprising:

a conductive layer located on a side of the second electrode layer away from the piezoelectric layer;

The conductive layer is adjacent to the second electrode layer.

Preferably, in the above-mentioned dual-frequency endoscopic catheter, grooves are formed on the side of the backing layer away from the first electrode layer.

An imaging device, the imaging device comprising: a rotation retraction control module, a data acquisition module, an ultrasonic catheter component, and a host computer;

The rotation retraction control module is communicatively connected with the data acquisition module;

The data acquisition module is communicatively connected with the host computer;

The ultrasonic catheter components include: a proximal drive slot, a catheter sheath, and the dual-frequency endoscopic catheter described in any one of the above;

One end of the proximal drive slot is connected to the rotation retraction control module, and the other end is connected to one end of the catheter sheath;

The dual frequency endoscopic catheter is located within the introducer sheath.

Beneficial effect

A dual-frequency endoscopic catheter provided by the present invention includes: a casing; a driving part located on one side of the casing, and the driving part is used to drive the casing to rotate; the side wall of the casing has an opening area; The first ultrasonic transducer and the second ultrasonic transducer are arranged in sequence along the first direction in the opening area; wherein the first direction is the same as the length extension direction of the housing.

The dual-frequency endoscopic catheter places two ultrasonic transducers in the catheter in a set arrangement, and the two transducers can transmit and receive ultrasonic pulses at the same time or with a delay, or can transmit and receive ultrasonic pulses independently , to provide high-quality ultrasonic dual-frequency fusion images by organically combining the array elements with two resolution capabilities.

Using the artificial matching layer structure of three or more layers designed by relevant theory and simulation, the matching layer of the dual-frequency ultrasonic transducer is made by high-precision coating, which effectively improves the output bandwidth and response amplitude of the transducer.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic structural diagram of an imaging device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of an ultrasonic catheter component provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a guide wire cavity provided by an embodiment of the present invention, a guide wire is arranged in the guide wire cavity;

Fig. 4 is a schematic structural diagram of a dual-frequency endoscopic catheter provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an ultrasonic transducer provided by an embodiment of the present invention;

Fig. 6 is a schematic diagram of wiring corresponding to the structure of the ultrasonic transducer shown in Fig. 5 provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another ultrasonic transducer provided by an embodiment of the present invention;

Fig. 8 is a schematic diagram of the wiring corresponding to the structure of the ultrasonic transducer shown in Fig. 7 provided by an embodiment of the present invention;

Fig. 9 is a schematic flowchart of a method for manufacturing a dual-frequency endoscopic catheter provided by an embodiment of the present invention.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Based on the content of the background technology, during the invention and creation process of the present application, the inventor found that, compared with the traditional single-array ultrasonic endoscopic catheter, the dual-frequency ultrasonic endoscopic catheter has two ultrasonic transducers with different frequencies. The design and assembly process of the transducer has always been a major bottleneck restricting the development of endoscopic ultrasound imaging technology.

Among them, the matching layer of the ultrasonic transducer mostly adopts traditional single-layer or double-layer matching, and the acoustic impedance matching cannot be well guaranteed, so that the output bandwidth and amplitude response of the ultrasonic transducer are not high enough.

In addition, the frequency of the ultrasonic endoscopic catheter with a single transducer is fixed and single, the imaging resolution of the high-frequency ultrasonic endoscopic catheter is high but the imaging depth is very shallow, and the imaging depth of the low-frequency ultrasonic endoscopic catheter is deep but the resolution is greatly reduced. It restricts the development of ultrasound images to high resolution and high imaging depth.

At the same time, it is difficult for a single transducer ultrasonic endoscopic catheter to complete the research of functional ultrasonic imaging such as elastography, which restricts the development of more diversified ultrasonic endoscopic catheters.

Based on this, in this application, two ultrasonic transducers are placed side by side in the catheter on the same side, and the two transducers can transmit and receive ultrasonic pulses at the same time or with a delay, and can also transmit and receive ultrasonic pulses independently. Array elements with two resolving powers are organically combined to provide high-quality ultrasound images.

Further, this application uses the artificial matching layer structure of three or more layers designed by relevant theories and simulations, and uses high-precision coating to make the matching layer of the dual-frequency ultrasonic transducer, effectively improving the output bandwidth of the transducer and response magnitude.

In general, the technical solution provided by this application uses ultrasonic dual-frequency array elements for ultrasonic endoscopic elastography, which can realize the combination of ultrasonic imaging and ultrasonic functional imaging, and provide a more reliable basis for clinical diagnosis.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an imaging device provided by an embodiment of the present invention.

The imaging device includes: a rotation retraction control module 11 , a data acquisition module 12 , an ultrasound catheter component 13 and a host computer 14 .

The rotation retraction control module 11 is connected with the data acquisition module 12 in communication.

The data acquisition module 12 is connected with the host computer 14 in communication.

Specifically, the rotation retraction control module 11 mainly includes: a motor, and a control module for controlling the working state of the motor.

Optionally, the motor at least includes a rotating motor and a retracting motor.

Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of an ultrasonic catheter component provided by an embodiment of the present invention.

The ultrasonic catheter components include: a proximal drive slot 131, a catheter sheath 132, and a dual-frequency endoscopic catheter 133 described in the following embodiments of this application.

One end of the proximal drive slot 131 is connected to the rotation retraction control module 11 , and the other end is connected to one end of the catheter sheath 132 .

The dual frequency endoscopic catheter 133 is located within the introducer sheath 132 .

Wherein, as shown in FIG. 2 , the ultrasound catheter component 13 further includes: a retraction fixing block 134 located on the catheter sheath 132 , and a guide wire lumen 135 away from the proximal driving groove 131 .

Referring to FIG. 3 , FIG. 3 is a schematic structural diagram of a guidewire lumen provided by an embodiment of the present invention. A guidewire is pre-threaded into the guidewire lumen 135 during surgery.

In this embodiment, the proximal drive slot 131 is fixedly connected to the rotating motor in the rotation retraction control module 11 , and then connected to the retraction component in the rotation retraction control module 11 , and the retraction fixing block 134 is stationary during retraction.

In the embodiment of the present application, a retractable distance greater than 150mm is taken as an example for illustration.

As shown in FIG. 2 , the proximal drive groove 131 is also provided with an injection cavity 136 , which provides a coupling environment for the ultrasonic transducer in the dual-frequency endoscopic catheter 133 and evacuates the air in the catheter sheath by injecting physiological saline.

Optionally, both the introducer sheath 132 and the guide wire lumen 135 are made of biocompatible materials.

Optionally, the catheter sheath 132 is divided into a part close to the proximal driving groove 131 and a part close to the guide wire lumen 135; wherein the catheter sheath 132 near the proximal driving groove 131 can be hard, non-transparent, and of high acoustic impedance The catheter sheath 132, the catheter sheath 132 near the guide wire lumen 135 can be a soft, transparent, low acoustic impedance catheter sheath 132 as an imaging window.

Optionally, the length of the opaque portion of the catheter sheath 132 is greater than 1 m, and the length of the imaging window is greater than 150 mm.

In one embodiment of the present invention, the length of the imaging window matches the maximum distance of the retraction distance.

For example, if the maximum retraction distance is 300mm, then the length of the imaging window is also set to 300mm.

Further, in one embodiment of the present invention, a scale line can be set on the catheter sheath 132 between the retraction fixing block 134 and the proximal driving groove 131 to measure the retraction distance, and at the same time, a scale line can be set on the rotation retraction module. The digital display board with a retraction distance corrects the non-uniform distortion caused by the movement of the catheter through a rigid correction algorithm to provide more accurate ultrasonic endoscopic images.

Optionally, in another embodiment of the present invention, refer to FIG. 4 , which is a schematic structural diagram of a dual-frequency endoscopic catheter provided by an embodiment of the present invention.

The dual-frequency endoscopic catheter includes:

shell15.

The driving part 16 located on one side of the casing 15 is used to drive the casing 15 to rotate.

The side walls of the housing 15 have open areas.

The first ultrasonic transducer 17 and the second ultrasonic transducer 18 are located in the opening area and arranged in sequence along the first direction. Optionally, the first ultrasonic transducer 17 and the second ultrasonic transducer 18 can be placed side by side on the same side (that is, arranged longitudinally), or placed in parallel on the same side (that is, arranged horizontally), or placed on different sides Placed side by side (that is, vertically dislocated back-to-back arrangement), or other arrangements such as back-to-back placement on different sides.

Wherein, the first direction is the same as the extending direction of the length of the housing 15 .

In this embodiment, the housing 15 is used to carry the first ultrasonic transducer 17 and the second ultrasonic transducer 18 and protect the first ultrasonic transducer 17 and the second ultrasonic transducer 18 .

Wherein, the side of the casing 15 facing away from the driving part 16 is in the shape of a bullet, and the length of the casing is extremely short. The design of the short bullet shape can significantly reduce the non-uniform distortion of the catheter during bending and retraction.

Optionally, the material of the housing 15 includes but not limited to biocompatible metal materials or non-metal materials, which need to have high strength to make it durable and increase its service life.

Optionally, as shown in Figure 4, the dual-frequency endoscopic catheter also includes:

The base 19 is located in the opening area, and the base 19 is fixedly connected with the shell 15 .

The first ultrasonic transducer 17 and the second ultrasonic transducer 18 are fixed on the base 19 .

Specifically, the first ultrasonic transducer 17 and the second ultrasonic transducer 18 are fixed inside the housing 15 through a base 19 .

The first ultrasonic transducer 17 and the second ultrasonic transducer 18 include but are not limited to being fixed on the base 19 with biocompatible glue, and the biocompatible glue can also play the role of isolation and insulation between the two .

Wherein, the design of the base 19 can greatly improve the coaxiality and coplanarity of the first ultrasonic transducer 17 and the second ultrasonic transducer 18 .

Optionally, the material of the base 19 includes but not limited to biocompatible non-metallic materials (insulating materials).

Optionally, the frequency of the first ultrasonic transducer 17 is less than or equal to 40 MHz; the frequency of the second ultrasonic transducer 18 is greater than 40 MHz.

That is to say, in this embodiment of the application, two ultrasonic transducers with different frequencies are taken as an example for illustration, wherein the first ultrasonic transducer 17 is a low-frequency ultrasonic transducer, and the second ultrasonic transducer 18 is a high-frequency ultrasonic transducer. frequency ultrasonic transducer.

Optionally, as shown in FIG. 4 , the driving component 16 is a torque coil.

The number of coil layers of the torque coil is at least two layers, preferably three layers or more.

Wherein, the casing 15 and the torque coil 16 include but are not limited to be connected and fixed by means of biocompatible glue, conductive silver glue or laser welding, and the torque coil is used to transmit the torque generated by the rotating motor.

In the embodiment of the present application, the torque coil has at least three layers of coils to achieve rotation in two directions, clockwise or counterclockwise, and has excellent bending performance, anti-shaking performance and safety performance.

Wherein, the dual-frequency endoscopic catheter is placed in the catheter sheath, and the area where the first ultrasonic transducer 17 and the second ultrasonic transducer 18 are located corresponds to the imaging window of the catheter sheath.

Optionally, as shown in Figure 4, the dual-frequency endoscopic catheter also includes:

A first coaxial cable 20 connected to the first ultrasonic transducer 17 .

A second coaxial cable 21 connected to the second ultrasonic transducer 18 .

Wherein, the first coaxial cable 20 and the second coaxial cable 21 are respectively connected to components such as the first ultrasonic transducer 17 and the second ultrasonic transducer 18 through the hollow area of the torque coil.

During operation, the introducer sheath, the guidewire lumen and the guidewire remain stationary, and the dual-frequency endoscopic catheter rotates and/or retracts.

Optionally, in another embodiment of the present invention, refer to FIG. 5 , which is a schematic structural diagram of an ultrasonic transducer provided in an embodiment of the present invention.

The first ultrasonic transducer 17 has the same structure as the second ultrasonic transducer 18, including:

backing layer 22 .

In the second direction, the first electrode layer 23 , the piezoelectric layer 24 , the second electrode layer 25 and at least three layers of acoustic artificial matching laminates 26 are sequentially stacked on one side of the backing layer 22 .

Wherein, the second direction is perpendicular to the backing layer 22 and is directed from the backing layer 22 to the first electrode layer 23 .

In this embodiment, one or more of piezoelectric single crystal materials or piezoelectric single crystal composite materials (such as PMN-PT single crystal material) with superior piezoelectric or dielectric properties are used to implement the first ultrasonic transducer 17 and the development of a second ultrasound transducer 18 .

Optionally, the backing layer 22 of the first ultrasonic transducer 17 and the second ultrasonic transducer 18 is prepared by using a material with high sound absorption performance (such as E-Solder 3022 or tungsten steel), so as to further reduce the The array element thickness of the transducer 17 and the second ultrasonic transducer 18 makes the outer diameter of the dual-frequency endoscopic catheter about 0.2mm-10mm, which is more convenient for endoscopic imaging in narrow and deep cardiovascular structures.

Wherein, the material of the first electrode layer 23 includes but not limited to Cr/Au material. (The electrode layer is first plated with nickel and chromium, and then gold-plated to ensure that the electrode is more firm).

The material of the second electrode layer 25 includes but not limited to Cr/Au material.

Optionally, at least three successively stacked acoustic artificial matching layers 26 include a first acoustic artificial matching layer A1 and a second acoustic artificial matching layer A2 which are sequentially stacked in the second direction; through the first acoustic artificial matching The layer A1 and the second acoustic artificial matching layer A2 are sequentially stacked in the second direction to form at least three sequentially stacked acoustic artificial matching laminates 26 .

Optionally, the material of the first artificial acoustic matching layer A1 may be a polymer material, such as parylene or the like.

Optionally, the material of the second acoustic artificial matching layer A2 may be a polymer material or a metal material, such as gold and other metal materials.

Optionally, the piezoelectric layer 24 may be piezoelectric ceramics, piezoelectric ceramic composite material, pressure-point single crystal material or piezoelectric single crystal composite material.

Optionally, a groove 27 is formed on a side of the backing layer 22 away from the first electrode layer 23 .

Further, refer to FIG. 6 , which is a schematic diagram of wiring corresponding to the structure of the ultrasonic transducer shown in FIG. 5 provided by an embodiment of the present invention.

Wherein, the coaxial cable is connected with the second electrode layer.

Optionally, in another embodiment of the present invention, refer to FIG. 7 , which is a schematic structural diagram of another ultrasonic transducer provided in an embodiment of the present invention.

The first ultrasonic transducer 17 has the same structure as the second ultrasonic transducer 18, and also includes:

a conductive layer 28 located on the side of the second electrode layer 25 away from the piezoelectric layer 24;

The conductive layer 28 is adjacent to the second electrode layer 25 .

In this embodiment, on the basis of the ultrasonic transducer structure shown in FIG. 5 , a conductive layer 28 may also be formed on the side of the second electrode layer 25 away from the piezoelectric layer 24 .

Optionally, the material of the conductive layer 28 includes, but is not limited to, metal materials such as gold.

Further, refer to FIG. 8 , which is a schematic diagram of wiring corresponding to the structure of the ultrasonic transducer shown in FIG. 7 provided by an embodiment of the present invention.

Wherein, the conductive layer 28 is connected to the metal shell, and the metal shell is connected to the shielding end of the coaxial cable.

It should be noted that, in FIGS. 5-8 , the acoustic artificial matching laminate 26 is only described by taking the number of three film layers as an example.

From the above description, it can be seen that in this application, the first ultrasonic transducer and the second ultrasonic transducer are manufactured by combining theory and simulation with three or more layers of acoustic artificial matching laminates to achieve higher resolution and higher resolution. Integrated integration of dual-frequency multi-scale imaging catheter with high signal-to-noise ratio and higher sensitivity; the positive and negative poles of the first ultrasonic transducer and the second ultrasonic transducer are realized through the two connection methods shown in Figure 6 and Figure 8 Connection.

Optionally, based on the dual-frequency endoscopic catheter provided by the above-mentioned embodiments of the present invention, the manufacturing process thereof is briefly described below, which is only used as an example for illustration:

Referring to FIG. 9 , FIG. 9 is a schematic flowchart of a method for manufacturing a dual-frequency endoscopic catheter provided by an embodiment of the present invention.

S101: Using PiezoCAD simulation to determine the thickness of each piezoelectric layer, each acoustic artificial matching layer, and the size of each ultrasonic transducer.

S102: respectively polishing and grinding the piezoelectric material to a thickness calculated by simulation.

S103: using a magnetron sputtering apparatus to respectively arrange nickel-chromium/gold electrode materials on the front and rear surfaces of the polished piezoelectric material.

S104: Using a precision diamond cutting machine to cut the above-mentioned dual-frequency array element to the size of the simulation design.

S105: Use E-Solder 3022 material to connect the array element, and use Epo-Tek 301 epoxy resin material to place the dual-frequency array element on the base and encapsulate it inside the shell.

S106: Arranging multiple layers of acoustic artificial matching layer material on the forward acoustic radiation surface of the array element.

It should be noted that since the thickness of the matching layer of the two array elements is inconsistent, it is necessary to perform manual occlusion processing on the array elements with low thickness requirements. (for Figure 8)

Due to the inconsistent thickness of the matching layers of the two array elements, the two different array elements are respectively plated with artificial acoustic structures and then assembled into the shell to obtain the best acoustic matching. (for Figure 6)

A dual-frequency endoscopic catheter and an imaging device provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood To limit the present invention.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part.

It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that elements inherent in a process, method, article, or apparatus comprising a set of elements are included or are also included as such , a method, an article or an element inherent in a device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A dual-frequency endoscopic catheter, characterized in that the dual-frequency endoscopic catheter includes:

   shell;

   a driving component located on one side of the housing, the driving component is used to drive the housing to rotate;

   The sidewall of the housing has an open area;

   a first ultrasonic transducer and a second ultrasonic transducer located in the opening area and arranged in sequence along the first direction;

   Wherein, the first direction is the same as the length extension direction of the housing.
2. The dual-frequency endoscopic catheter according to claim 1, wherein the frequency of the first ultrasonic transducer is less than or equal to 40MHz;

   The frequency of the second ultrasonic transducer is greater than 40MHz.
3. The dual-frequency endoscopic catheter according to claim 1, wherein the dual-frequency endoscopic catheter further comprises:

   a base located in the opening area, and the base is fixedly connected to the housing;

   The first ultrasonic transducer and the second ultrasonic transducer are fixed on the base.
4. The dual-frequency endoscopic catheter according to claim 1, wherein the side of the casing facing away from the driving part is in the shape of a bullet.
5. The dual-frequency endoscopic catheter according to claim 1, wherein the driving component is a torque coil;

   The number of coil layers of the torque coil is at least two layers.
6. The dual-frequency endoscopic catheter according to claim 1, wherein the dual-frequency endoscopic catheter further comprises:

   a first coaxial cable connected to the first ultrasonic transducer;

   A second coaxial cable connected to the second ultrasonic transducer.
7. The dual-frequency endoscopic catheter according to claim 1, wherein the first ultrasonic transducer and the second ultrasonic transducer have the same structure, including:

   backing layer;

   In the second direction, the first electrode layer, the piezoelectric layer, the second electrode layer and at least three successively stacked acoustic artificial matching laminates on one side of the backing layer;

   Wherein, the second direction is perpendicular to the backing layer, and is directed from the backing layer to the first electrode layer.
8. The dual-frequency endoscopic catheter according to claim 7, wherein the structure of the first ultrasonic transducer and the second ultrasonic transducer is the same, further comprising:

   a conductive layer located on a side of the second electrode layer away from the piezoelectric layer;

   The conductive layer is adjacent to the second electrode layer.
9. The dual-frequency endoscopic catheter according to claim 7, characterized in that grooves are formed on the side of the backing layer away from the first electrode layer.
10. An imaging device, characterized in that the imaging device includes: a rotation retraction control module, a data acquisition module, an ultrasonic catheter component, and a host computer;

    The rotation retraction control module is communicatively connected with the data acquisition module;

    The data acquisition module is communicatively connected with the host computer;

    The ultrasonic catheter components include: a proximal drive slot, a catheter sheath, and the dual-frequency endoscopic catheter according to any one of claims 1-9;

    One end of the proximal drive slot is connected to the rotation retraction control module, and the other end is connected to one end of the catheter sheath;

    The dual frequency endoscopic catheter is located within the introducer sheath.