Intravascular ultrasound catheter, vascular ultrasound detection system and control method

Abstract

The application relates to an intravascular ultrasound catheter, a blood vessel ultrasound detection system and a control method. The intravascular ultrasound catheter comprises a tube body, a liquid injection port arranged at the proximal end of the tube body, and a liquid outlet arranged at the distal end of the tube body; a detection assembly comprising a transmission shaft, a first detection device and a second detection device, the first detection device and the second detection device being arranged at the distal end of the transmission shaft respectively, the second detection device being located on the proximal end side of the first detection device, the first detection device being an ultrasonic transducer, the transmission shaft being located in the tube body and capable of rotating relative to the tube body and moving along the axial direction of the tube body; wherein the first detection device is used for detecting a blood vessel, and the second detection device is used for detecting bubbles in the tube body. The scheme provided by the application can eliminate the influence of bubbles on blood vessel imaging during detection, and reduce the operation time and risk.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an intravascular ultrasound catheter, a vascular ultrasound detection system, and a control method. Background Technology

[0002] The main cause of coronary heart disease is coronary atherosclerosis, a chronic disease caused by the gradual accumulation of plaque in blood vessels. Its development process can be summarized as follows: Blood clots form in the cardiovascular system, blocking the blood vessel lumen → The thrombus recanalizes, forming a new blood flow channel. Simultaneously, the intima covers this new channel, forming a new lumen, and the thrombus becomes part of the lumen → Lipids are released from the thrombus within the lumen, forming atherosclerotic plaques → These plaques grow, gradually blocking the coronary arteries (chronic coronary heart disease) or rupture, releasing lipids and further blocking the coronary arteries (acute coronary heart disease). The primary cause of most acute coronary heart disease and intravascular thrombosis is the rupture of vulnerable plaques attached to the blood vessel wall.

[0003] Currently, the main method for diagnosing coronary artery disease is coronary angiography. However, this technique can only image the blood flow within the vessel and is easily affected by the angiography angle, making it unable to assess the development of plaque on the vessel wall. Intravascular Ultrasound (IVUS) technology, developed in the late 20th century, uses a miniature ultrasound probe installed at the tip of a cardiac catheter to display real-time cross-sectional images of the blood vessel. It can clearly show the thickness of the vessel wall structure, the size and shape of the lumen, accurately measure the vessel diameter and cross-sectional area, and even identify lesions such as calcification, fibrosis, and lipid pools, detecting early vascular lesions that cannot be detected by coronary angiography. As an important supplement to coronary angiography, IVUS improves the accuracy of lesion diagnosis and has significant guiding significance for the strategy, stent selection, and efficacy evaluation of percutaneous coronary intervention (PCI).

[0004] In related technologies, rotating IVUS catheters require thorough flushing to remove air bubbles, otherwise these bubbles will affect the image quality of the probe and thus the doctor's judgment. Furthermore, when acquiring images of long blood vessels, the catheter needs to be retracted. Air bubbles may also accumulate during this retraction process, leading to the loss of images of critical locations within the blood vessel, further impacting the doctor's assessment. This necessitates removing the air bubbles and retracting the catheter again, increasing surgical time and increasing risks such as coronary perforation. Summary of the Invention

[0005] To address or partially address the problems existing in related technologies, this application provides an intravascular ultrasound catheter, a vascular ultrasound detection system, and a control method, which can eliminate the impact of air bubbles on vascular imaging during the detection process and reduce surgical time and risks.

[0006] This application provides an intravascular ultrasound catheter, comprising: a tube body, wherein a fluid inlet is provided at the proximal end of the tube body and a fluid outlet is provided at the distal end of the tube body; and a detection assembly, comprising a drive shaft, a first detection device, and a second detection device, wherein the first detection device and the second detection device are respectively disposed at the distal end of the drive shaft, the second detection device being located at the proximal end of the first detection device, the first detection device being an ultrasound transducer, the drive shaft being located within the tube body, and the drive shaft being rotatable relative to the tube body and movable along the axial direction of the tube body; wherein the first detection device is used to detect blood vessels, and the second detection device is used to detect air bubbles within the tube body.

[0007] Furthermore, the tube body includes a support tube, a telescopic tube, and a connecting seat, with the distal end of the telescopic tube connected to the proximal end of the support tube, and the connecting seat connected to the proximal end of the telescopic tube.

[0008] Furthermore, the near end of the drive shaft is provided with a bearing seat, and the connecting seat is sleeved on the bearing seat, and the bearing seat can rotate relative to the connecting seat.

[0009] Furthermore, the telescopic tube includes an inner tube and an outer tube sleeved on the inner tube. The inner tube is capable of telescopic movement relative to the outer tube. The distal end of the outer tube is connected to the support tube, and the proximal end of the inner tube is connected to the connecting seat.

[0010] Furthermore, the tube body also includes a first stress-relieving tube and a second stress-relieving tube. The first stress-relieving tube is sleeved at the connection between the inner tube and the connecting seat, and the second stress-relieving tube is sleeved at the connection between the outer tube and the supporting tube.

[0011] Furthermore, the injection port is located on the connector, and the tube body also includes a one-way valve located at the injection port.

[0012] Furthermore, the second detection device is an ultrasonic transducer or a light sensor.

[0013] A second aspect of this application provides a vascular ultrasound detection system, comprising: an intravascular ultrasound catheter as described above; a retraction module for driving the transmission shaft to rotate within the catheter body and to move axially along the catheter body; an injection module connected to the injection port; and a control module communicatively connected to the retraction module, the injection module, the first detection device, and the second detection device, wherein the control module controls the injection module to inject liquid into the catheter body to flush out the air bubbles when the second detection device detects air bubbles within the catheter body.

[0014] Furthermore, the proximal end of the tube and the proximal end of the drive shaft are respectively connected to the retraction module.

[0015] A third aspect of this application provides a method for controlling an intravascular ultrasound catheter, applied to the intravascular ultrasound catheter as described above, the method comprising:

[0016] Control the retraction of the drive shaft within the tube, so that the drive shaft moves towards the proximal end along the axis of the tube while rotating;

[0017] Acquire information detected by the first detection device, and generate a vascular image based on the information detected by the first detection device;

[0018] Obtain information detected by the second detection device;

[0019] If the information detected by the second detection device indicates that there are air bubbles in the tube, liquid is injected into the tube to flush out the air bubbles.

[0020] The technical solution provided in this application can include the following beneficial effects: By setting a first detection device and a second detection device at the distal end of the drive shaft, with the second detection device located proximally to the first detection device, during intravascular ultrasound detection, the drive shaft is located inside the tube. While rotating relative to the tube, the drive shaft moves proximally along the axial direction of the tube. The second detection device is used to detect air bubbles inside the tube. In this way, the second detection device will first detect air bubbles in areas not detected by the first detection device. When air bubbles are detected, liquid is injected into the tube through the injection port to flush out the air bubbles, thereby eliminating the influence of air bubbles on the detection of the first detection device, ensuring the imaging quality of the blood vessel, and enabling the first detection device to acquire continuous and complete long-segment blood vessel images, avoiding multiple retraction detections, thereby reducing operation time and risks.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The above and other objects, features and advantages of this application will become more apparent from the following description of exemplary embodiments of this application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of this application.

[0023] Figure 1 This is a schematic diagram of the structure of an intravascular ultrasound catheter shown in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the detection component shown in an embodiment of this application;

[0025] Figure 3 yes Figure 2 A magnified view of the detection component at the far end is shown;

[0026] Figure 4This is a schematic diagram illustrating the working principle of an intravascular ultrasound catheter as shown in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the structure of the vascular ultrasound detection system shown in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram illustrating the working principle of the vascular ultrasound detection system shown in the embodiments of this application;

[0029] Figure 7 This is a flowchart illustrating the control method of an intravascular ultrasound catheter as shown in the embodiments of this application;

[0030] Figure 8 This is another flowchart illustrating the control method of an intravascular ultrasound catheter as shown in the embodiments of this application;

[0031] Figure 9 This is an exploded view of an intravascular ultrasound catheter shown in an embodiment of this application.

[0032] Figure label:

[0033] 1-Intravascular ultrasound catheter,

[0034] 11-Pipe body, 111-Injection port, 112-Support pipe, 113-Telescopic pipe, 1131-Outer pipe, 114-Connecting seat, 114a-Slot, 115-First stress-relieving pipe, 116-Second stress-relieving pipe, 117-Check valve

[0035] 12-Detection assembly, 121-Drive shaft, 122-First detection device, 123-Second detection device, 124-Shaft seat, 13-Clip ring,

[0036] 2-Retraction module, 3-Injection module, 4-Control module, 5-Injection pipe, 6-Base, 7-Cable, 8-Radial artery, 9-Coronary artery, 10-Air bubble, 20-Stenotic lesion area. Detailed Implementation

[0037] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0038] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0039] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In related technologies, rotating IVUS catheters require thorough flushing to remove air bubbles, otherwise these bubbles will affect the image quality of the probe and thus the doctor's judgment. Furthermore, when acquiring images of long blood vessels, the catheter needs to be retracted. Air bubbles may also accumulate during this retraction, causing the image of a certain location on the vessel to be lost, further impacting the doctor's assessment. This necessitates removing the air bubbles and retracting the catheter again, increasing the procedure time and introducing risks such as coronary perforation.

[0041] To address the aforementioned issues, this application provides an intravascular ultrasound catheter that can eliminate the impact of air bubbles on vascular imaging during the detection process, thereby reducing surgical time and risks.

[0042] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0043] like Figures 1 to 3 As shown in the figure, this application provides an intravascular ultrasound catheter 1, including a tube body 11 and a detection component 12. The proximal end of the tube body 11 is provided with an injection port 111, and the distal end of the tube body 11 is provided with an outlet (not shown in the figure). Liquid, such as physiological saline, can be injected into the tube body 11 through the injection port 111. The injected liquid will flush out air bubbles in the tube body 11 and then be discharged from the outlet of the tube body 11.

[0044] The detection assembly 12 includes a drive shaft 121, a first detection device 122, and a second detection device 123. The first detection device 122 and the second detection device 123 are respectively located at the distal end of the drive shaft 121, and the second detection device 123 is located at the proximal end of the first detection device 122. The first detection device 122 is an ultrasonic transducer. The drive shaft 121 is located inside the tube body 11 and is capable of rotating relative to the tube body 11 and moving along the axial direction of the tube body 11. The first detection device 122 is used to detect blood vessels, and the second detection device 123 is used to detect air bubbles inside the tube body 11.

[0045] Based on the above scheme, by setting a first detection device 122 and a second detection device 123 at the distal end of the drive shaft 121, and with the second detection device 123 located on the proximal side of the first detection device 122, during intravascular ultrasound detection, the drive shaft 121 is located inside the tube body 11. While rotating relative to the tube body 11, the drive shaft 121 moves proximally along the axial direction of the tube body 11. The second detection device 123 is used to detect air bubbles in the tube body 11. In this way, the second detection device 123 will first detect air bubbles in areas not detected by the first detection device 122. When air bubbles are detected, liquid is injected into the tube body 11 through the injection port 111 to flush out the air bubbles, thereby eliminating the influence of air bubbles on the detection of the first detection device 122, ensuring the imaging quality of the blood vessels, and enabling the first detection device 122 to acquire continuous and complete long-segment blood vessel images, avoiding multiple retraction detections, thereby reducing operation time and risks.

[0046] It should be noted that, in this embodiment, the proximal end of the tube body 11 and the drive shaft 121 is the end located outside the patient's body during the operation, and the distal end of the tube body 11 and the drive shaft 121 is the end that extends into the blood vessel during the operation. The proximal side of the first detection device 122 refers to the side of the first detection device 122 that is close to the proximal end of the drive shaft 121 when the axis of the drive shaft 121 is in a straight line. The second detection device 123 is located on the proximal side of the first detection device 122, that is, when the axis of the drive shaft 121 is in a straight line, the second detection device 123 is closer to the proximal end of the drive shaft 121 than the first detection device 122.

[0047] Specifically, such as Figure 4As shown, when the drive shaft 121 retracts within the tube 11 for detection, it rotates while moving proximally, i.e., to the right in the diagram. The second detection device 123 is located proximally to the first detection device 122, i.e., to the right of the first detection device 122 in the diagram. The tube 11 contains air bubbles 10, and the blood vessels near the air bubbles 10 have narrowed lesion areas 20. During the retraction of the drive shaft 121, the second detection device 123 will detect the air bubbles 10 first, while the detection area of ​​the first detection device 122 has not yet reached the position of the air bubbles 10. By injecting liquid into the injection port 111, the air bubbles 10 are flushed out of the tube 11. Thus, the first detection device 122 will not detect the air bubbles 10 during its rightward movement, ensuring that it does not affect the acquisition of blood vessel images and enabling the doctor to accurately determine the narrowed lesion area 20.

[0048] In some embodiments, such as Figure 1 As shown, the pipe body 11 includes a support pipe 112, a telescopic pipe 113, and a connecting seat 114. The distal end of the telescopic pipe 113 is connected to the proximal end of the support pipe 112, and the connecting seat 114 is connected to the proximal end of the telescopic pipe 113. Specifically, the distal end of the drive shaft 121 extends into the pipe body 11 from the connecting seat 114, passes through the telescopic pipe 113, and is located at the support pipe 112. The telescopic pipe 113 can extend and retract, so that the telescopic pipe 113 gradually lengthens when the drive shaft 121 is retracted.

[0049] like Figure 1 , Figure 2 and Figure 9 As shown, in this embodiment, a bearing seat 124 is provided at the proximal end of the drive shaft 121, and a connecting seat 114 is sleeved on the bearing seat 124. The bearing seat 124 can rotate relative to the connecting seat 114. Specifically, the connecting seat 114 has a cavity to accommodate the bearing seat 124. The bearing seat 124 can rotate within the cavity. When the bearing seat 124 rotates, it will drive the drive shaft 121 to rotate. However, the bearing seat 124 cannot move relative to the connecting seat 114 along the axial direction of the drive shaft 121 because the connecting seat 114 has a groove 114a in the circumferential direction. After the bearing seat 124 and the connecting seat 114 are assembled, a retaining ring 13 is then assembled. The retaining ring 13 has a buckle that matches the groove 114a in the circumferential direction of the connecting seat 114. After the bearing seat 124 is installed into the connecting seat 114, the retaining ring 13 is fastened, so that the bearing seat 124 can rotate relative to the connecting seat 114 but cannot move axially.

[0050] When the drive shaft 121 retracts, the drive shaft seat 124 rotates and simultaneously drives the connecting seat 114 to move, causing the telescopic tube 113 to extend, so that the two detection devices at the far end of the drive shaft 121 rotate within the tube body 11 while moving toward the near end.

[0051] In this embodiment, the telescopic tube 113 includes an inner tube (not shown in the figure) and an outer tube 1131 sleeved on the inner tube. The inner tube can telescopically move relative to the outer tube 1131, driving the transmission shaft 121 to move. The distal end of the outer tube 1131 is connected to the support tube 112, and the proximal end of the inner tube is connected to the connecting seat 114. Specifically, the connections between the tube segments are sealed to ensure that the injected liquid will only be discharged from the tube body 11 through the outlet. The connecting seat 114 is also sealed to prevent liquid from flowing out of the connecting seat 114.

[0052] like Figure 1 As shown, in this embodiment, the tube body 11 further includes a first stress-relieving tube 115 and a second stress-relieving tube 116. The first stress-relieving tube 115 is sleeved at the connection between the inner tube and the connecting seat 114, and the second stress-relieving tube 116 is sleeved at the connection between the outer tube 1131 and the supporting tube 112. Specifically, the first stress-relieving tube 115 is used to prevent bending between the inner tube and the connecting seat 114 due to stress concentration, and the second stress-relieving tube 116 is used to prevent bending between the outer tube 1131 and the supporting tube 112 due to stress concentration. Both the first stress-relieving tube 115 and the second stress-relieving tube 116 can be made of relatively soft resin or silicone materials.

[0053] In some embodiments, the injection port 111 is provided on the connector 114, and the pipe body 11 further includes a one-way valve 117 provided at the injection port 111. The one-way valve 117 may have only one interface connected to the water injection device, or the one-way valve 117 may be a three-way valve, capable of connecting two water injection devices.

[0054] Optionally, the second detection device 123 is an ultrasonic transducer or a light sensor, which can emit and receive ultrasonic or light signals. After the ultrasonic or light signal passes through the bubble, the received reflected signal will change. The presence of a bubble in the tube 11 can be determined based on the received ultrasonic or light signal.

[0055] In this embodiment, the drive shaft 121 is a flexible structure capable of entering the tortuous coronary arteries and can be bent. Simultaneously, the drive shaft 121 needs to possess a certain degree of rigidity to prevent breakage. The drive shaft 121 can be a hyaluronic acid tube structure or a spring structure, etc. The distal region of the support tube 112, which faces the first detection device 122 during detection, is made of a material with good acoustic signal properties, such as PA, Pebax, or HDPE. The proximal region of the tube body 11 should have good rigidity, providing support and preventing bending when the IVUS catheter is inserted into the body. Materials such as PEEK or Pebax 72D are suitable. Alternatively, a reinforced composite tube with an internal braided mesh can be added.

[0056] like Figure 5 and Figure 6As shown, this application embodiment also provides a vascular ultrasound detection system, including a retraction module 2, an injection module 3, a control module 4, and the intravascular ultrasound catheter 1 described in the above embodiment.

[0057] The retraction module 2 is used to drive the transmission shaft 121 to rotate inside the tube body 11 and to move axially along the tube body 11. The liquid injection module 3 is connected to the liquid injection port 111 and is used to inject liquid into the liquid injection port 111. Specifically, the liquid injection module 3 is connected to the liquid injection port 111 through the water injection pipe 5.

[0058] Water can only be injected into the lumen of the tube body 11 in one direction, that is, water can only be injected into the tube body 11 from the injection module 3 and discharged from the far end of the tube body 11.

[0059] The control module 4 is communicatively connected to the retraction module 2, the injection module 3, the first detection device 122, and the second detection device 123. Specifically, the retraction module 2 is communicatively connected to the control module 4 via cable 7. The control module 4 is used to control the injection module 3 to inject liquid into the tube 11 to flush out air bubbles when the second detection device 123 detects air bubbles inside the tube 11. The control module 4 can also be used to generate image information of blood vessels based on the detection signal from the first detection device 122.

[0060] Using the aforementioned vascular ultrasound detection system, the distal end of the intravascular ultrasound catheter 1 is inserted into the coronary artery 9 via the patient's radial artery 8. When the drive shaft 121 retracts for detection, the second detection device 123 first performs bubble detection on the area not detected by the first detection device 122. When a bubble is detected, feedback is sent to the control module 4. The control module 4 controls the injection module 3 to inject liquid into the tube 11 to flush out the bubble, thereby eliminating the influence of the bubble on the detection of the first detection device 122, ensuring the imaging quality of the blood vessel, and enabling the first detection device 122 to obtain continuous and complete long-segment blood vessel images in one detection, avoiding multiple retraction detections, thereby reducing operation time and risk.

[0061] The proximal ends of the tube body 11 and the drive shaft 121 are respectively connected to the retraction module 2. Specifically, the retraction module 2 is connected to the connecting seat 114 and the shaft seat 124. The retraction module 2 can drive the shaft seat 124 to rotate and can also drive the connecting seat 114 and the shaft seat 124 to move. The retraction module 2 is mounted on the base 6, and the proximal end of the outer tube 1131 of the telescopic tube 113 is snapped and fixed on the base 6. The retraction module 2 drives the inner tube to extend and retract through the connecting seat 114.

[0062] like Figure 7 As shown, this application embodiment also provides a control method for an intravascular ultrasound catheter, applied to the intravascular ultrasound catheter 1 described in the above embodiment. The control method includes:

[0063] S1. Control the drive shaft 121 to retract within the tube 11, so that the drive shaft 121 moves towards the proximal end along the axis of the tube 11 while rotating. Specifically, the retraction module 2 drives the drive shaft 121 to rotate within the tube 11 while moving towards the proximal end along the axis of the tube 11.

[0064] S2. Obtain the information detected by the first detection device 122, and generate a blood vessel image based on the information detected by the first detection device 122.

[0065] S3. Obtain the information detected by the second detection device 123. The second detection device 123 is used to detect whether there are air bubbles inside the tube 11.

[0066] S4. If it is determined from the information detected by the second detection device 123 that there are air bubbles in the tube 11, liquid is injected into the tube 11 to flush out the air bubbles.

[0067] Specifically, liquid, such as physiological saline, is injected into the tube 11 through the injection port 111. In some embodiments, the retraction of the drive shaft 121 can be stopped during liquid injection; that is, the drive shaft 121 stops moving and rotating, and the retraction of the drive shaft 121 is resumed after the air bubbles have been flushed out. In other embodiments, the retraction of the drive shaft 121 may not be stopped during liquid injection; that is, the drive shaft 121 continues to move and rotate while the air bubbles are being flushed out, without affecting the detection of the first detection device 122.

[0068] like Figure 8 As shown in the embodiments of this application, another more detailed control method for an intravascular ultrasound catheter is provided, applied to the intravascular ultrasound catheter 1 described in the above embodiments. This control method includes the following steps:

[0069] 1. Percutaneous puncture of the radial artery, insertion of a guiding catheter, and arrival at the coronary ostium.

[0070] 2. Using DSA, inject contrast agent along the guiding catheter, locate the target position, and insert the guidewire to reach the target position.

[0071] 3. Flush the pipe body 11 with water to expel the gas inside the pipe body 11.

[0072] 4. The intravascular ultrasound catheter 1 enters the target position along the guidewire, and the first detection device 122 begins to rotate in place.

[0073] 5. The drive shaft 121 begins to retract. The signal acquired by the first detection device 122 is fed back to the control module 4, which converts it into an image. The detection information acquired by the second detection device 123 is also fed back to the control module 4 to verify whether there are air bubbles at the current position. If no air bubbles are detected, retraction continues. If air bubbles are detected, a signal is sent to the liquid injection module 3 to flush out the air bubbles. During flushing, the retraction can be stopped or continued.

[0074] 6. The drive shaft 121 is retracted to acquire intravascular ultrasound images of the entire segment, providing the operator with imaging guidance.

[0075] 7. The intravascular ultrasound catheter 1 is withdrawn from the body, and the operation is completed.

[0076] In summary, the embodiments of this application provide an intravascular ultrasound catheter, a vascular ultrasound detection system, and a control method that can eliminate the influence of air bubbles on the image, obtain complete and accurate images of the blood vessels, provide imaging guidance for the operator, and reduce the risk of multiple retractions caused by air bubbles.

[0077] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here.

[0078] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An intravascular ultrasound catheter, characterized in that, include: The tube body has an injection port at its proximal end and an outlet at its distal end. The detection assembly includes a drive shaft, a first detection device, and a second detection device. The first detection device and the second detection device are respectively located at the distal end of the drive shaft, and the second detection device is located at the proximal end of the first detection device. The first detection device is an ultrasonic transducer. The drive shaft is located inside the tube and is capable of rotating relative to the tube and moving along the axial direction of the tube. The first detection device is used to detect blood vessels, and the second detection device is used to detect air bubbles in the tube before the first detection device during the retraction of the drive shaft.

2. The intravascular ultrasound catheter according to claim 1, characterized in that: The tube body includes a support tube, a telescopic tube, and a connecting seat. The distal end of the telescopic tube is connected to the proximal end of the support tube, and the connecting seat is connected to the proximal end of the telescopic tube.

3. The intravascular ultrasound catheter according to claim 2, characterized in that: The drive shaft is provided with a bearing seat at its near end, and the connecting seat is sleeved on the bearing seat, and the bearing seat is rotatable relative to the connecting seat.

4. The intravascular ultrasound catheter according to claim 2, characterized in that: The telescopic tube includes an inner tube and an outer tube sleeved on the inner tube. The inner tube is capable of telescopic movement relative to the outer tube. The distal end of the outer tube is connected to the support tube, and the proximal end of the inner tube is connected to the connecting seat.

5. The intravascular ultrasound catheter according to claim 4, characterized in that: The tube body also includes a first stress-relieving tube and a second stress-relieving tube. The first stress-relieving tube is sleeved at the connection between the inner tube and the connecting seat, and the second stress-relieving tube is sleeved at the connection between the outer tube and the supporting tube.

6. The intravascular ultrasound catheter according to claim 2, characterized in that: The injection port is located on the connector, and the tube body also includes a one-way valve located at the injection port.

7. The intravascular ultrasound catheter according to claim 1, characterized in that: The second detection device is an ultrasonic transducer or a light sensor.

8. A vascular ultrasound detection system, characterized in that, include: The intravascular ultrasound catheter as described in any one of claims 1-7 above; A retraction module is used to drive the transmission shaft to rotate within the tube body and to move axially along the tube body; The liquid injection module is connected to the liquid injection port; The control module is communicatively connected to the retraction module, the injection module, the first detection device, and the second detection device. The control module is used to control the injection module to inject liquid into the tube to flush out the air bubbles when the second detection device detects air bubbles in the tube.

9. The vascular ultrasound detection system according to claim 8, characterized in that: The proximal end of the tube and the proximal end of the drive shaft are respectively connected to the retraction module.

10. A method for controlling an intravascular ultrasound catheter, characterized in that, The control method, applied to the intravascular ultrasound catheter as described in any one of claims 1-7, comprises: Control the retraction of the drive shaft within the tube, so that the drive shaft moves towards the proximal end along the axis of the tube while rotating; Acquire information detected by the first detection device, and generate a vascular image based on the information detected by the first detection device; Obtain information detected by the second detection device; If the information detected by the second detection device indicates that there are air bubbles in the tube, liquid is injected into the tube to flush out the air bubbles.

Images