Intravascular ultrasound catheters and systems

Abstract

The present application relates to an intravascular ultrasound catheter and system. The intravascular ultrasound catheter comprises: a support tube, a telescopic tube assembly, and a transmission shaft. The telescopic tube assembly comprises an inner tube, an outer tube, and a stopper. The stopper is located at the proximal end of the outer tube. The stopper is provided with a water injection chamber connected to the outer tube. The stopper is sleeved on the inner tube and slidably connected to the inner tube. The distal end of the inner tube can extend from the water injection chamber into the outer tube and then extend from the outer tube into the water injection chamber. The stopper is provided with a water injection port connected to the water injection chamber. The outer tube, the stopper, and the inner tube are respectively sleeved on the support tube, and the support tube is connected to the distal end of the outer tube. The transmission shaft is located within the support tube and is provided with an ultrasonic detection device. The support tube is provided with a water injection port. The water injection chamber is connected to the support tube through the water injection port, so that liquid injected into the water injection chamber from the water injection port can enter the support tube through the water injection port. The solution provided by the present application can improve the efficiency of syringe injection to expel bubbles in the catheter and avoid interference during operation.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to an intravascular ultrasound catheter and system. Background Art

[0002] The primary cause of coronary artery disease (CAD) is coronary atherosclerosis, a chronic disease caused by the gradual accumulation of debris within blood vessels. Its progression is briefly described as follows: Blood coagulation within the cardiovascular system forms a thrombus, which blocks the vessel lumen. The thrombus then recanalizes, creating a new blood flow channel. Simultaneously, the intima covers the new channel, forming a new lumen, and the thrombus becomes part of the lumen. The thrombus within the lumen releases lipids, forming an atherosclerotic plaque. The plaque then grows, gradually blocking the coronary artery (chronic CAD) or ruptures, releasing lipids and blocking the coronary artery (acute CAD). Most acute CAD and intravascular thrombosis are primarily caused by the rupture of vulnerable plaques attached to the vessel wall.

[0003] Currently, the primary method for detecting coronary heart disease is coronary angiography, but this technology can only image blood flow within blood vessels and is easily affected by the imaging angle, making it unable to determine the development of plaque on the vessel wall. Intravascular ultrasound (IVUS) technology, invented in the late 20th century, uses a miniature ultrasound probe mounted on the tip of a cardiac catheter to display cross-sectional images of blood vessels in real time. 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 displayed by coronary angiography. As an important supplement to coronary angiography, IVUS improves the accuracy of lesion diagnosis and has important guiding significance for the strategy, stent selection, and efficacy evaluation of percutaneous coronary intervention (PCI).

[0004] In the related art, an IVUS system includes an intravascular ultrasound catheter and a retraction device. A connector is provided at the proximal end of the intravascular ultrasound catheter, which is connected to the retraction device via the connector. The connector is provided with a connecting valve for connecting a syringe. The syringe is used to inject liquid into the intravascular ultrasound catheter through the connecting valve to flush out bubbles in the intravascular ultrasound catheter, thereby ensuring the imaging quality of the ultrasound image. However, the syringe easily interferes with the retraction device during injection, so an extension tube is required to avoid interference, which is cumbersome and inconvenient to use. At the same time, when the syringe is injected into the ultrasound catheter to flush out bubbles, the efficiency of expelling bubbles in the ultrasound catheter is relatively low. Summary of the Invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides an intravascular ultrasound catheter and system, which can improve the efficiency of injecting liquid into the syringe and expelling bubbles in the catheter, while avoiding interference between the syringe and the withdrawal device during operation.

[0006] The first aspect of the present application provides an intravascular ultrasonic catheter, comprising: a support tube, a telescopic tube assembly and a transmission shaft; the telescopic tube assembly comprises an inner tube, an outer tube and a limit seat, the limit seat being arranged at the proximal end of the outer tube, a water injection cavity communicating with the outer tube being provided in the limit seat, the limit seat being sleeved on the inner tube and slidably connected to the inner tube, the distal end of the inner tube being able to extend from the water injection cavity into the outer tube and extend from the outer tube into the water injection cavity; the limit seat being provided with a water injection port communicating with the water injection cavity; the outer tube, the limit seat and the inner tube being respectively sleeved on the support tube, the support tube being connected to the distal end of the outer tube, the transmission shaft being located in the support tube, the transmission shaft being provided with an ultrasonic detection device, the support tube being provided with a water injection hole, the water injection cavity being communicated with the support tube through the water injection hole, so that liquid injected into the water injection cavity from the water injection port can enter the support tube from the water injection hole.

[0007] Furthermore, the water injection hole is located in the water injection cavity and is arranged opposite to the water injection port.

[0008] Furthermore, there are multiple water injection holes, and the multiple water injection holes are arranged at intervals along the axial direction of the support tube.

[0009] Furthermore, the support tube is provided with a plurality of water injection hole groups arranged at intervals along the axial direction of the support tube, and the water injection hole groups include a plurality of water injection holes arranged circumferentially around the axis of the support tube.

[0010] Furthermore, the intravascular ultrasonic catheter further includes a sealing member disposed between the inner tube and the limiting seat, and the sealing member is used to prevent the liquid in the water injection cavity from overflowing from the gap between the inner tube and the limiting seat.

[0011] Furthermore, the intravascular ultrasonic catheter further includes a connecting seat and a connecting valve, wherein the connecting seat is connected to the proximal end of the inner tube, and the connecting valve is connected to the water injection port.

[0012] Furthermore, the connecting valve is a one-way one-way valve or a one-way three-way valve.

[0013] Furthermore, the above-mentioned intravascular ultrasonic catheter also includes a support seat, which is connected to the proximal end of the transmission shaft, and the connecting seat is sleeved on the support seat and rotatably connected to the support seat.

[0014] Furthermore, the above-mentioned intravascular ultrasonic catheter also includes a first stress relief tube and a second stress relief tube. The first stress relief tube is sleeved at the connection between the inner tube and the connecting seat, and the second stress relief tube is sleeved at the connection between the outer tube and the support tube.

[0015] A second aspect of the present application provides an intravascular ultrasound system, comprising: a retraction device, a retraction base, a syringe and the intravascular ultrasound catheter described in any of the above schemes; the syringe is connected to the water inlet, the retraction device is arranged on the retraction base, the retraction device is connected to the proximal end of the inner tube, and the limit seat is connected to the retraction base; the retraction device is used to drive the transmission shaft to rotate in the support tube and move along the axial direction of the support tube.

[0016] The technical solution provided by the present application may include the following beneficial effects: liquid is injected into the water injection cavity through the water injection port, and the water injection cavity is connected to the support tube through the water injection hole, so that the liquid injected into the water injection cavity from the water injection port can enter the support tube through the water injection hole, thereby flushing out the bubbles in the support tube; the limit seat is arranged at the proximal end of the outer tube, and compared with the method of injecting liquid from the connecting seat, the position of liquid injection from the limit seat is closer to the distal end of the support tube, and the resistance of liquid entering the support tube from the water injection cavity through the water injection hole is smaller, and it is easier to enter the support tube, and it can flush out the bubbles at the distal end of the support tube more quickly, thereby improving the efficiency of the syringe injection and bubble discharge. At the same time, because the limit seat is arranged on the outer tube, the position of the water injection port is relatively far away from the withdrawal device, which can avoid interference between the syringe and the withdrawal device during operation, thereby avoiding the use of an extension tube, and making operation more convenient.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail the exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 is a schematic structural diagram of an intravascular ultrasound system in related art;

[0020] Figure 2 is a cross-sectional schematic diagram of an intravascular ultrasound catheter in the related art;

[0021] Figure 3 is a schematic structural diagram of an intravascular ultrasound system according to an embodiment of the present application;

[0022] Figure 41 is a schematic structural diagram of an intravascular ultrasound catheter shown in an embodiment of the present application;

[0023] Figure 5 is another structural schematic diagram of an intravascular ultrasound catheter shown in an embodiment of the present application;

[0024] Figure 6 is an exploded view of an intravascular ultrasound catheter shown in an embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of an intravascular ultrasound catheter shown in an embodiment of the present application;

[0026] Figure 8 yes Figure 7 A partial enlarged cross-sectional view of the intravascular ultrasound catheter at the stop seat is shown;

[0027] Figure 9 This is a partially enlarged cross-sectional view of an intravascular ultrasound catheter at a limiting seat shown in one embodiment of the present application;

[0028] Figure 10 A partial enlarged cross-sectional view of an intravascular ultrasound catheter at a stop seat shown in another embodiment of the present application;

[0029] Figure 11 This is a schematic structural diagram of an intravascular ultrasound catheter at a limiting seat according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 1'-intravascular ultrasound catheter, 13'-transmission shaft, 15'-connecting seat, 16'-connecting valve, 17'-through hole,

[0032] 1-intravascular ultrasound catheter, 11-support tube, 111-water injection hole, 12-telescopic tube assembly, 121-inner tube, 122-outer tube, 123-limiting seat, 1231-water injection cavity, 1232-water injection port,

[0033] 13- transmission shaft, 14- sealing, 15- connecting seat, 16- connecting valve, 17- supporting seat, 18- clamping ring, 19- first stress relief tube, 20- second stress relief tube, 30- withdrawal device, 40- withdrawal base, 50- syringe, 60- extension tube. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0035] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are 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 encompasses any and all possible combinations of one or more of the associated listed items.

[0036] 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 each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] like Figure 1 and Figure 2 As shown, in the related art, the IVUS system includes an intravascular ultrasound catheter 1' and a retraction device 30. The proximal end of the intravascular ultrasound catheter 1' is provided with a connecting seat 15', and the intravascular ultrasound catheter 1' is connected to the retraction device 30 through the connecting seat 15'. A connecting valve 16' is provided on the connecting seat 15', and the connecting valve 16' is used to connect a syringe 50. The syringe 50 is used to inject liquid into the intravascular ultrasound catheter 1' through the connecting valve 16' to flush out bubbles in the intravascular ultrasound catheter 1', thereby ensuring the imaging quality of the ultrasound image.

[0038] However, the syringe 50 is prone to interfere with the withdrawal device 30 during injection, so an extension tube 60 is required to avoid interference, which is cumbersome to use and inconvenient to operate. Figure 2 As shown, the inventors found that injecting liquid from the connecting seat 15' requires the liquid to spread from the proximal end of the intravascular ultrasonic catheter 1' to the distal end of the intravascular ultrasonic catheter 1' and be discharged, and when the liquid enters the intravascular ultrasonic catheter 1' from the connecting seat 15', it needs to pass through the through hole 17' of the connecting seat 15', and the through hole 17' also requires the transmission shaft 13' to pass through. Therefore, the liquid needs to pass through the gap between the transmission shaft 13' and the through hole 17' to enter the intravascular ultrasonic catheter 1'. Due to structural and size limitations, the gap is very small. When the syringe 50 injects liquid into the intravascular ultrasonic catheter 1' to flush out bubbles, it encounters large resistance and the injection is slow. Therefore, the efficiency of discharging bubbles in the intravascular ultrasonic catheter 1' is relatively low.

[0039] To address the above problems, an embodiment of the present application provides an intravascular ultrasound catheter and system, which can improve the efficiency of the syringe 50 in injecting liquid and expelling bubbles in the catheter, and avoid interference between the syringe 50 and the withdrawal device 30 during operation.

[0040] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] like Figure 3 As shown, an embodiment of the present application provides an intravascular ultrasound system, including a retraction device 30, a retraction base 40, a syringe 50 and an intravascular ultrasound catheter 1.

[0042] Among them, Figures 4 to 8 As shown, the intravascular ultrasound catheter 1 includes a support tube 11, a telescopic tube assembly 12, and a transmission shaft 13. The telescopic tube assembly 12 includes an inner tube 121, an outer tube 122, and a stopper 123. The stopper 123 is disposed at the proximal end of the outer tube 122 and defines a water injection chamber 1231 in communication with the outer tube 122. The stopper 123 is sleeved over the inner tube 121 and slidably connected thereto. The distal end of the inner tube 121 can extend from the water injection chamber 1231 into the outer tube 122 and then out from the outer tube 122 into the water injection chamber 1231. The stopper 123 defines a water injection port 1232 in communication with the water injection chamber 1231.

[0043] The outer tube 122, the limit seat 123 and the inner tube 121 are respectively sleeved on the support tube 11, the support tube 11 is connected to the distal end of the outer tube 122, the transmission shaft 13 is located in the support tube 11, and the transmission shaft 13 is provided with an ultrasonic detection device. The support tube 11 is provided with a water injection hole 111, and the water injection cavity 1231 is connected with the support tube 11 through the water injection hole 111, so that the liquid injected into the water injection cavity 1231 from the water injection port 1232 can enter the support tube 11 from the water injection hole 111.

[0044] The syringe 50 is connected to the water injection port 1232. The retraction device 30 is provided on the retraction base 40. The retraction device 30 is connected to the proximal end of the inner tube 121. The limit seat 123 is connected to the retraction base 40. The retraction device 30 is used to drive the transmission shaft 13 to rotate within the support tube 11 and move along the axial direction of the support tube 11.

[0045] Based on the above scheme, liquid is injected into the water injection chamber 1231 through the water injection port 1232. The liquid can be physiological saline. The water injection chamber 1231 is connected to the support tube 11 through the water injection hole 111, so that the liquid injected into the water injection chamber 1231 from the water injection port 1232 can enter the support tube 11 from the water injection hole 111, and then flush out the bubbles in the support tube 11; the limiting seat 123 is arranged at the proximal end of the outer tube 122. Compared with the method of injecting liquid from the connecting seat, the position of liquid injection from the limiting seat 123 is closer to the distal end of the support tube 11, and the resistance of the liquid entering the support tube 11 from the water injection chamber 1231 through the water injection hole 111 is smaller, and it is easier to enter the support tube 11, and can flush out the bubbles at the distal end of the support tube 11 more quickly, thereby improving the efficiency of the syringe 50 in injecting liquid and discharging bubbles. At the same time, since the limit seat 123 is arranged on the outer tube 122, the position of the water injection port 1232 is relatively far away from the withdrawal device 30, which can avoid interference between the syringe 50 and the withdrawal device 30 during operation, thereby avoiding the use of an extension tube, and making operation more convenient.

[0046] It should be noted that in the embodiment of the present application, the distal end of the intravascular ultrasonic catheter 1 refers to the end extending into the human body, and the proximal end of the intravascular ultrasonic catheter 1 refers to the end located outside the human body for connecting to the retrieval device 30. For the outer tube 122, inner tube 121, support tube 11, transmission shaft 13 and other parts in the intravascular ultrasonic catheter 1, the distal end refers to the end close to the distal end of the intravascular ultrasonic catheter 1, and the corresponding proximal end refers to the end close to the proximal end of the intravascular ultrasonic catheter 1.

[0047] Specifically, the limit seat 123 is buckled downward from above, fixedly engaging the limit seat 123 on the retraction base 40, thereby limiting the movement of the outer tube 122. The limit seat 123 can be cylindrical or cubical in shape, and the retraction base 40 is provided with a slot for engaging the limit seat 123. The retraction device 30 is connected to the proximal end of the inner tube 121 and the proximal end of the drive shaft 13, and is used to drive the inner tube 121 to telescopically move relative to the outer tube 122, and to drive the drive shaft 13 to rotate within the support tube 11 and to move axially along the support tube 11. The ultrasonic detection device is located at the distal end of the drive shaft 13. During ultrasonic testing, the retraction device 30 controls the movement of the drive shaft 13, thereby driving the movement of the ultrasonic detection device. Specifically, when the retraction device 30 drives the drive shaft 13 to retract, the drive shaft 13 simultaneously rotates and moves toward the proximal end of the support tube 11, causing the ultrasonic detection device to simultaneously rotate and move toward the proximal end of the support tube 11, thereby acquiring an ultrasonic image of the blood vessel segment. Air bubbles within the support tube 11 can affect the imaging of the ultrasonic detection device, so it is necessary to flush out the bubbles from the detection area of ​​the ultrasonic detection device. The retraction device 30 is also connected to a control host for controlling the operation of the retraction device 30. The control host is also connected to the ultrasonic detection device to receive detection signals from the ultrasonic detection device and generate an ultrasonic image of the blood vessel based on the detection signals.

[0048] Figure 4 The figure shows the structure of the intravascular ultrasound catheter 1 when the inner tube 121 is retracted relative to the outer tube 122, that is, the state when the inner tube 121 is extended into the outer tube 122; Figure 5 The diagram shows the structure of the intravascular ultrasound catheter 1 when the inner tube 121 is extended relative to the outer tube 122. During ultrasound testing, the retraction device 30 drives the inner tube 121 to gradually extend out of the outer tube 122, that is, the ultrasound detection device at the distal end of the transmission shaft 13 moves from the distal end to the proximal end.

[0049] like Figure 8 As shown, in this embodiment, the distal end of the inner tube 121 extends beyond the proximal end of the outer tube 122 and is located within the water injection chamber 1231. The diameter of the distal end of the inner tube 121 is larger than the opening on the right side of the water injection chamber 1231, thereby limiting the distal end of the inner tube 121 from moving out of the water injection chamber 1231 from the right side of the water injection chamber 1231. The left side of the limit seat 123 is fixedly connected to the proximal end of the outer tube 122, and the proximal end of the outer tube 122 is in communication with the water injection chamber 1231. The distal end of the inner tube 121 can pass through the left side of the water injection chamber 1231 and extend into the outer tube 122. When performing water flushing, the distal end of the inner tube 121 can be moved to the right area within the water injection chamber 1231, allowing the liquid injected into the water injection chamber 1231 from the water injection port 1232 to directly enter the support tube 11.

[0050] Furthermore, in order to facilitate the liquid in the water injection cavity 1231 to enter the support tube 11, in some embodiments, the water injection hole 111 is located in the water injection cavity 1231 and is arranged opposite to the water injection port 1232. Figure 8 As shown, the water injection hole 111 is located on the tube wall of the support tube 11 in the water injection cavity 1231, and the water injection hole 111 is opposite to the water injection port 1232. In this way, the liquid injected from the water injection port 1232 can enter the support tube 11 from the water injection hole 111 more quickly, so that the liquid can more quickly discharge the bubbles at the far end of the support tube 11 from the water outlet opened at the far end of the support tube 11, thereby improving the efficiency of bubble flushing.

[0051] Furthermore, in order to improve the efficiency of water injection, there can be multiple water injection ports 1232 on the limit seat 123, that is, multiple syringes 50 can be connected at the same time, and multiple syringes 50 inject water into the limit seat 123 at the same time to ensure that sufficient water intake can flush out the bubbles in the tube cavity without the need for a single syringe 50 to inject water multiple times.

[0052] like Figure 9As shown, in some embodiments, there are multiple water injection holes 111, and the multiple water injection holes 111 are spaced apart along the axial direction of the support tube 11, which can further improve the efficiency of water injection and flushing bubbles. In particular, it is ensured that at least one water injection hole 111 is located in the water injection cavity 1231, and the other water injection holes 111 can be located to the right of the water injection cavity 1231, that is, the area where the inner tube 121 is located, or the water injection holes 111 can be located to the left of the water injection cavity 1231, that is, the area where the outer tube 122 is located.

[0053] like Figure 10 As shown, in some embodiments, the support tube 11 is provided with a plurality of water injection holes 111 groups arranged at intervals along the axial direction of the support tube 11, and each water injection hole 111 group includes a plurality of water injection holes 111 arranged circumferentially around the axis of the support tube 11, so as to further improve the efficiency of water injection to flush bubbles.

[0054] like Figures 8 to 10 As shown, the intravascular ultrasound catheter 1 of the embodiment of the present application also includes a seal 14 arranged between the inner tube 121 and the limiting seat 123, and the seal 14 is used to prevent the liquid in the water injection cavity 1231 from overflowing from the gap between the inner tube 121 and the limiting seat 123.

[0055] Specifically, the seal 14 can be a sealing ring, a sealing groove is provided on the limit seat 123, the sealing ring is arranged in the sealing groove, and the sealing ring is sleeved on the inner tube 121, so that the inner tube 121 can slide relative to the limit seat 123 while ensuring the sealing between the inner tube 121 and the limit seat 123.

[0056] like Figures 4 to 8 As shown, the intravascular ultrasound catheter 1 of the embodiment of the present application further includes a connecting seat 15 and a connecting valve 16. The connecting seat 15 is connected to the proximal end of the inner tube 121, and the connecting valve 16 is connected to the water injection port 1232. Specifically, the connecting seat 15 is fixedly connected to the proximal end of the inner tube 121, and the inner tube 121 is connected to the withdrawal device 30 via the connecting seat 15. The syringe 50 injects liquid into the water injection chamber 1231 through the connecting valve 16. The connecting valve 16 can be integrally formed with the limiting seat 123. The connecting valve 16 is a one-way valve that ensures that the liquid in the water injection chamber 1231 does not flow out of the water injection port 1232.

[0057] like Figure 11 As shown, in some embodiments, the connecting valve 16 is a one-way three-way valve, which can be connected to two syringes 50 at the same time to improve the water injection efficiency.

[0058] like Figure 6 and Figure 7As shown, the intravascular ultrasound catheter 1 of the embodiment of the present application further includes a support base 17, which is connected to the proximal end of the transmission shaft 13. The connecting base 15 is sleeved on the support base 17 and rotatably connected to the support base 17. Specifically, the retraction device 30 controls the rotation and movement of the transmission shaft 13 through the support base 17. The support base 17 is fixedly connected to the transmission shaft 13, and the transmission shaft 13 can be a hypotube structure or a spring structure. The inner cavity of the connecting base 15 is also provided with a clamping ring 18, which abuts the right side of the support base 17 to prevent the support base 17 from dislodging from the connecting base 15.

[0059] like Figures 4 to 6 As shown, the intravascular ultrasound catheter 1 of the embodiment of the present application further includes a first stress-relief tube 19 and a second stress-relief tube 20. The first stress-relief tube 19 is sleeved over the connection between the inner tube 121 and the connector 15, while the second stress-relief tube 20 is sleeved over the connection between the outer tube 122 and the support tube 11. Specifically, the proximal end of the inner tube 121 is fixedly connected to the connector 15, while the distal end of the outer tube 122 is fixedly connected to the support tube 11. The first stress-relief tube 19 is used to prevent bending between the inner tube 121 and the connector 15 due to stress concentration, while the second stress-relief tube 20 is used to prevent bending between the outer tube 122 and the support tube 11 due to stress concentration. Both the first stress-relief tube 19 and the second stress-relief tube 20 can be made of a relatively soft resin material.

[0060] The working principle of the intravascular ultrasound system provided in the embodiment of the present application is as follows:

[0061] 1. Percutaneously puncture the radial artery and insert a guiding catheter to reach the coronary artery ostium.

[0062] 2. Use DSA to inject contrast agent along the guiding catheter, find the target location, and insert the guide wire to reach the target location.

[0063] 3. Flush the intravascular ultrasound catheter 1 with water to expel the gas in the catheter.

[0064] 4. The intravascular ultrasound catheter 1 enters the target position along the guidewire, the control host transmits a signal, and the ultrasound detection device starts to rotate in place.

[0065] 5. The intravascular ultrasound catheter 1 is withdrawn to obtain the entire intravascular ultrasound image and provide imaging guidance to the operator.

[0066] 6. The intravascular ultrasound catheter 1 is removed from the body and the operation is completed.

[0067] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not 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 selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. An intravascular ultrasound catheter, characterized in that: include: support tubes, telescopic tube assemblies, and drive shafts; The telescopic tube assembly includes an inner tube, an outer tube and a limit seat, wherein the limit seat is provided at the proximal end of the outer tube, and a water injection cavity communicated with the outer tube is provided in the limit seat, the limit seat is sleeved on the inner tube and slidably connected to the inner tube, and the distal end of the inner tube can extend from the water injection cavity into the outer tube and extend from the outer tube to the water injection cavity; the limit seat is provided with a water injection port communicated with the water injection cavity; The outer tube, the limit seat and the inner tube are respectively sleeved on the support tube, the support tube is connected to the distal end of the outer tube, the transmission shaft is located in the support tube, the transmission shaft is provided with an ultrasonic detection device, a water injection hole is provided on the tube wall of the support tube, the water injection cavity is connected with the support tube through the water injection hole, so that the liquid injected into the water injection cavity from the water injection port can enter the support tube from the water injection hole.

2. The intravascular ultrasound catheter according to claim 1, characterized in that: The water injection hole is located in the water injection cavity and is arranged opposite to the water injection port.

3. The intravascular ultrasound catheter according to claim 1, wherein: There are a plurality of water injection holes, and the plurality of water injection holes are arranged at intervals along the axial direction of the support tube.

4. The intravascular ultrasound catheter according to claim 1, wherein: The support tube is provided with a plurality of water injection hole groups arranged at intervals along the axial direction of the support tube, and the water injection hole groups include a plurality of water injection holes arranged circumferentially around the axis of the support tube.

5. The intravascular ultrasound catheter according to claim 1, wherein: It also includes a sealing member provided between the inner tube and the limiting seat, and the sealing member is used to prevent the liquid in the water injection cavity from overflowing from the gap between the inner tube and the limiting seat.

6. The intravascular ultrasound catheter according to claim 1, characterized in that: It also includes a connecting seat and a connecting valve, wherein the connecting seat is connected to the proximal end of the inner tube, and the connecting valve is connected to the water injection port.

7. The intravascular ultrasound catheter according to claim 6, characterized in that: The communication valve is a one-way one-way valve or a one-way three-way valve.

8. The intravascular ultrasound catheter according to claim 6, characterized in that: It also includes a support base, which is connected to the proximal end of the transmission shaft. The connecting base is sleeved on the support base and is rotatably connected to the support base.

9. The intravascular ultrasound catheter according to claim 6, characterized in that: It also includes a first stress relief tube and a second stress relief tube. The first stress relief tube is sleeved at the connection between the inner tube and the connecting seat, and the second stress relief tube is sleeved at the connection between the outer tube and the supporting tube.

10. An intravascular ultrasound system, characterized in that: include: A retraction device, a retraction base, a syringe, and an intravascular ultrasound catheter according to any one of claims 1 to 9; The syringe is communicated with the water injection port, the retraction device is provided on the retraction base, the retraction device is connected to the proximal end of the inner tube, and the limit seat is connected to the retraction base; The retraction device is used to drive the transmission shaft to rotate in the support tube and move along the axial direction of the support tube.

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