CN116158785A - Intravascular ultrasound catheter and system - Google Patents

Abstract

The present application relates to an intravascular ultrasound catheter and system. The intravascular ultrasound catheter comprises: support tube, telescopic tube assembly and transmission shaft; the telescopic pipe assembly comprises an inner pipe, an outer pipe and a limiting seat, wherein the limiting seat is arranged at the proximal end of the outer pipe, a water injection cavity communicated with the outer pipe is arranged in the limiting seat, the limiting seat is sleeved on the inner pipe and is in sliding connection with the inner pipe, and the distal end of the inner pipe can extend into the outer pipe from the water injection cavity and extend out of the outer pipe 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 with the far end of the outer tube, the transmission shaft is positioned in the support tube, the ultrasonic detection device is arranged on the transmission shaft, the support tube is provided with a water injection hole, and the water injection cavity is communicated with the support tube through the water injection hole, so that liquid injected into the water injection cavity from the water injection hole can enter the support tube from the water injection hole. According to the scheme, the efficiency of injecting liquid into the injector and discharging bubbles in the guide pipe can be improved, and interference in the operation process is avoided.

Description

Intravascular ultrasound catheter and system

Technical Field

The application relates to the technical field of medical equipment, in particular to an intravascular ultrasound catheter and an intravascular ultrasound system.

Background

The main cause of coronary heart disease is coronary atherosclerosis, which is a chronic disease formed by gradual accumulation of intravascular waste. The development process is briefly described as follows: the blood vessel is formed by blood coagulation in the heart blood vessel, the blood vessel cavity is blocked, the thrombus is recanalized to form a new blood flow channel, meanwhile, an inner membrane covers the new channel to form a new tube cavity, the thrombus is formed into a part of the tube cavity, the thrombus in the tube cavity releases lipid to form an atherosclerosis plaque, the plaque grows, the coronary artery is gradually blocked (chronic coronary heart disease) or the plaque is broken, and the lipid is released and the coronary artery is blocked (acute coronary heart disease). Among them, the main cause of most acute coronary heart disease and intravascular thrombosis is the rupture of vulnerable plaque attached to the vessel wall.

At present, coronary angiography is the main means for detecting coronary heart disease, but the technology can only image the blood flow condition in blood vessels, is easily affected by the angle of radiography, and cannot judge the plaque development condition on the blood vessel walls. The intravascular ultrasound (Intra-Vascular UltraSound, IVUS) technology is born at the end of the 20 th century, and utilizes a miniature ultrasonic probe arranged at the top end of a cardiac catheter to display the sectional image of a blood vessel in real time, so that the thickness, the lumen size, the lumen shape and the like of a vessel wall structure can be clearly displayed, the diameter and the sectional area of a blood vessel cavity can be accurately measured, and even lesions such as calcification, fibrosis and lipid pool can be identified, and early lesions of the blood vessel which cannot be displayed by coronary angiography can be found. As an important supplementary means of coronary angiography, the IVUS improves the accuracy of lesion diagnosis, and has important guiding significance for strategy, stent selection and effect evaluation of coronary intervention treatment (Percutaneous Coronary Intervention, PCI).

In the related art, the IVUS system comprises an intravascular ultrasound catheter and a retracting device, wherein the proximal end of the intravascular ultrasound catheter is provided with a connecting seat, the intravascular ultrasound catheter is connected with the retracting device through the connecting seat, the connecting seat is provided with a communication valve, the communication valve is used for connecting an injector, and the injector is used for injecting liquid into the intravascular ultrasound catheter through the communication valve so as to flush out bubbles in the intravascular ultrasound catheter, so that the imaging quality of an ultrasound image is ensured. However, the injector is easy to interfere with the retracting device during liquid injection, so that an extension tube is needed to avoid interference, and the injector is complicated to use and inconvenient to operate; meanwhile, when the injector injects liquid into the ultrasonic catheter to wash bubbles, the efficiency of discharging the bubbles in the ultrasonic catheter is lower.

Disclosure of Invention

In order to solve or partially solve the problems in the related art, the application provides an intravascular ultrasound catheter and an intravascular ultrasound system, which can improve the efficiency of injecting liquid into a syringe and discharging bubbles in the catheter, and avoid interference between the syringe and a retracting device in the operation process.

A first aspect of the present application provides an intravascular ultrasound catheter comprising: support tube, telescopic tube assembly and transmission shaft; the telescopic pipe assembly comprises an inner pipe, an outer pipe and a limiting seat, wherein the limiting seat is arranged at the proximal end of the outer pipe, a water injection cavity communicated with the outer pipe is arranged in the limiting seat, the limiting seat is sleeved on the inner pipe and is in sliding connection with the inner pipe, and the distal end of the inner pipe can extend into the outer pipe from the water injection cavity and extend from the inner pipe to the water injection cavity; the limit seat is provided with a water injection port communicated with the water injection cavity; the outer tube, spacing seat with the inner tube is located respectively the cover stay tube, the stay tube with the distal end of outer tube is connected, the transmission shaft is located in the stay tube, be equipped with ultrasonic detection device on the transmission shaft, the stay tube is equipped with the water injection hole, the water injection chamber passes through the water injection hole with the stay tube intercommunication, so that follow the water injection mouth is poured into the liquid of water injection chamber can follow the water injection hole gets into the stay tube.

Further, the water injection hole is positioned in the water injection cavity and is opposite to the water injection port.

Further, the water injection holes are multiple, and the multiple water injection holes are arranged at intervals along the axial direction of the supporting tube.

Further, a plurality of water injection hole groups are arranged on the support tube at intervals along the axial direction of the support tube, and each water injection hole group comprises a plurality of water injection holes circumferentially arranged around the axis of the support tube.

Further, the intravascular ultrasound catheter further comprises a sealing element arranged between the inner tube and the limiting seat, and the sealing element is used for preventing liquid in the water injection cavity from overflowing from a gap between the inner tube and the limiting seat.

Further, the intravascular ultrasound catheter further comprises a connecting seat and a communication valve, wherein the connecting seat is connected with the proximal end of the inner tube, and the communication valve is communicated with the water injection port.

Further, the communication valve is a one-way single-way valve or a one-way three-way valve.

Further, the intravascular ultrasound catheter further comprises a supporting seat, the supporting seat is connected with the proximal end of the transmission shaft, and the connecting seat is sleeved on the supporting seat and is rotationally connected with the supporting seat.

Further, the intravascular ultrasound catheter further comprises a first stress relief pipe and a second stress relief pipe, wherein the first stress relief pipe is sleeved at the joint of the inner pipe and the connecting seat, and the second stress relief pipe is sleeved at the joint of the outer pipe and the supporting pipe.

A second aspect of the present application provides an intravascular ultrasound system comprising: a retraction device, a retraction base, a syringe, and an intravascular ultrasound catheter according to any one of the preceding aspects; the injector is communicated with the water injection port, the retraction device is arranged on the retraction base, the retraction device is connected with the proximal end of the inner tube, and the limit seat is connected with the retraction base; the retraction device is used for driving the transmission shaft to rotate in the supporting tube and move along the axial direction of the supporting tube.

The technical scheme that this application provided can include following beneficial effect: injecting liquid into the water injection cavity through the water injection port, wherein the water injection cavity is communicated with the support pipe through the water injection hole, so that the liquid injected into the water injection cavity from the water injection port can enter the support pipe from the water injection hole, and bubbles in the support pipe are flushed out; the proximal end of outer tube is located to spacing seat, compares in the mode of injecting liquid from the connecting seat department, and the position of annotating liquid from spacing seat is nearer the distal end of stay tube to liquid is from the water injection chamber through the resistance that the water injection hole got into the stay tube littleer, more gets into in the stay tube, can wash away the bubble of stay tube distal end more fast, has improved the efficiency of syringe notes liquid discharge bubble. Meanwhile, as the limiting seat is arranged on the outer tube, the position of the water filling port is far away from the retracting device, interference between the syringe and the retracting device in the operation process can be avoided, the extension tube is avoided, and the operation is more convenient.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

FIG. 1 is a schematic diagram of a related art intravascular ultrasound system;

FIG. 2 is a schematic cross-sectional view of a related art intravascular ultrasound catheter;

FIG. 3 is a schematic diagram of an intravascular ultrasound system shown in an embodiment of the present application;

FIG. 4 is a schematic structural view of an intravascular ultrasound catheter shown in an embodiment of the present application;

FIG. 5 is another schematic structural view of an intravascular ultrasound catheter shown in an embodiment of the present application;

FIG. 6 is an exploded view of an intravascular ultrasound catheter shown in an embodiment of the present application;

FIG. 7 is a cross-sectional view of an intravascular ultrasound catheter shown in an embodiment of the present application;

FIG. 8 is an enlarged partial cross-sectional view of the intravascular ultrasound catheter shown in FIG. 7 at a stop seat;

FIG. 9 is an enlarged partial cross-sectional view of an intravascular ultrasound catheter at a stop pad shown in an embodiment of the present application;

FIG. 10 is an enlarged partial cross-sectional view of an intravascular ultrasound catheter at a stop pad according to another embodiment of the present application;

fig. 11 is a schematic view of an intravascular ultrasound catheter at a stop pad according to an embodiment of the present application.

Reference numerals:

1' -intravascular ultrasound catheter, 13' -transmission shaft, 15' -connecting seat, 16' -communicating valve, 17' -via hole,

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

13-transmission shaft, 14-sealing piece, 15-connecting seat, 16-communication valve, 17-supporting seat, 18-collar, 19-first destressing line, 20-second destressing line, 30-withdrawal device, 40-withdrawal base, 50-syringe, 60-extension tube.

Detailed Description

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

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

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first message may also be referred to as a second message, and similarly, a second message may also be referred to as a first message, without departing from the scope of the present application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1 and 2, in the related art, the IVUS system includes an intravascular ultrasound catheter 1' and a retracting device 30, a connection seat 15' is provided at a proximal end of the intravascular ultrasound catheter 1', the intravascular ultrasound catheter 1' is connected to the retracting device 30 through the connection seat 15', a communication valve 16' is provided on the connection seat 15', the communication valve 16' is used for connecting an injector 50, and the injector 50 is used for injecting liquid into the intravascular ultrasound catheter 1' through the communication valve 16' to flush out bubbles in the intravascular ultrasound catheter 1', thereby ensuring imaging quality of an ultrasound image.

However, the syringe 50 is easy to interfere with the retracting device 30 during the injection, and thus the extension tube 60 is required to avoid interference, which is cumbersome to use and inconvenient to operate. Meanwhile, as shown in fig. 2, the inventor found that the injection of the liquid from the connection base 15 'requires the liquid to spread from the proximal end of the intravascular ultrasound catheter 1' to the distal end of the intravascular ultrasound catheter 1 'and that the liquid to be discharged from the connection base 15' into the intravascular ultrasound catheter 1 'requires the passage hole 17' through the connection base 15', and the passage hole 17' also requires the transmission shaft 13 'to pass through, so that the liquid needs to pass through the gap between the transmission shaft 13' and the passage hole 17 'to enter the intravascular ultrasound catheter 1', and is limited by the structure and the size, the gap is small, the resistance to be applied when the syringe 50 injects the liquid to flush the bubble into the intravascular ultrasound catheter 1 'is large, the injection is slow, and therefore the efficiency of discharging the bubble in the intravascular ultrasound catheter 1' is relatively low.

In view of the above problems, embodiments of the present application provide an intravascular ultrasound catheter and a system, which can improve the efficiency of injecting liquid into the syringe 50 and discharging air bubbles in the catheter, and avoid interference between the syringe 50 and the retraction device 30 during operation.

The following describes the technical scheme of the embodiments of the present application in detail with reference to the accompanying drawings.

As shown in fig. 3, an embodiment of the present application provides an intravascular ultrasound system comprising a retraction device 30, a retraction base 40, a syringe 50, and an intravascular ultrasound catheter 1.

As shown in fig. 4 to 8, the intravascular ultrasound catheter 1 includes a support tube 11, a telescopic tube assembly 12, and a drive shaft 13. The telescopic tube assembly 12 comprises an inner tube 121, an outer tube 122 and a limiting seat 123, wherein the limiting seat 123 is arranged at the proximal end of the outer tube 122, a water injection cavity 1231 communicated with the outer tube 122 is arranged in the limiting seat 123, the limiting seat 123 is sleeved on the inner tube 121 and is in sliding connection with the inner tube 121, and the distal end of the inner tube 121 can extend into the outer tube 122 from the water injection cavity 1231 and extend out of the outer tube 122 to the water injection cavity 1231; the limiting seat 123 is provided with a water injection port 1232 communicated with the water injection cavity 1231.

The outer tube 122, the limiting seat 123 and the inner tube 121 are respectively sleeved on the support tube 11, the support tube 11 is connected with the distal end of the outer tube 122, the transmission shaft 13 is positioned in the support tube 11, 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 communicated with the support tube 11 through the water injection hole 111, so that 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.

Wherein, syringe 50 communicates with water filling port 1232, and withdrawal device 30 is disposed on withdrawal base 40, and withdrawal device 30 is connected to the proximal end of inner tube 121, and limiting seat 123 is connected to withdrawal base 40. The retracting device 30 is used for driving the transmission shaft 13 to rotate in the support pipe 11 and to move in the axial direction of the support pipe 11.

Based on the above-mentioned scheme, the liquid is injected into the water injection cavity 1231 through the water injection port 1232, the liquid may be normal saline, and the water injection cavity 1231 is communicated 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, and further the bubbles in the support tube 11 are flushed out; the proximal end of outer tube 122 is located to spacing seat 123, compares in the mode of pouring into liquid from the connecting seat department, and the position of annotating the liquid from spacing seat 123 is closer to the distal end of stay tube 11 to the resistance that liquid got into stay tube 11 from water injection chamber 1231 through water injection hole 111 is less, gets into in the stay tube 11 more easily, can wash away the bubble of stay tube 11 distal end more fast, has improved the efficiency of syringe 50 notes liquid discharge bubble. Meanwhile, since the limiting seat 123 is arranged on the outer tube 122, the water injection port 1232 is located far from the retracting device 30, interference between the syringe 50 and the retracting device 30 in the operation process can be avoided, further, the use of an extension tube is avoided, and the operation is more convenient.

It should be noted that, in the embodiment of the present application, the distal end of the intravascular ultrasound catheter 1 refers to an end extending into the human body, the proximal end of the intravascular ultrasound catheter 1 refers to an end located outside the human body and used for being connected to the retracting device 30, for the distal ends of the outer tube 122, the inner tube 121, the support tube 11, the transmission shaft 13 and other parts in the intravascular ultrasound catheter 1, the distal end refers to an end near the distal end of the intravascular ultrasound catheter 1, and the corresponding proximal end refers to an end near the proximal end of the intravascular ultrasound catheter 1.

Specifically, the limiting seat 123 is fastened downwards from above, so that the limiting seat 123 is fixedly clamped on the retracting base 40, the outer tube 122 is limited to move, the limiting seat 123 can be cylindrical or cubic, and a clamping groove for clamping the limiting seat 123 is formed in the retracting base 40. The retracting device 30 is connected to the proximal end of the inner tube 121 and the proximal end of the transmission shaft 13, and is used for driving the inner tube 121 to move telescopically relative to the outer tube 122, and driving the transmission shaft 13 to rotate in the support tube 11 and move axially along the support tube 11. The ultrasonic detection device is arranged at the distal end of the transmission shaft 13, and when ultrasonic detection is carried out, the retraction device 30 drives the ultrasonic detection device to move by controlling the transmission shaft 13 to move, specifically, when the retraction device 30 drives the transmission shaft 13 to retract, the transmission shaft 13 moves towards the proximal end of the support tube 11 while rotating, so that the ultrasonic detection device moves towards the proximal end of the support tube 11 while rotating, and an ultrasonic image of the blood vessel is obtained. The air bubbles in the support tube 11 affect the imaging of the ultrasonic detection device, and thus the air bubbles in the detection area of the ultrasonic detection device need to be flushed out. The retraction device 30 is also in communication connection with a control host, the control host can control the retraction device 30 to work, and the control host can also be in communication connection with an ultrasonic detection device for receiving detection signals of the ultrasonic detection device and generating ultrasonic images of blood vessels according to the detection signals.

Fig. 4 is a schematic view showing the structure of the intravascular ultrasound catheter 1 when the inner tube 121 is retracted relative to the outer tube 122, i.e., the state when the inner tube 121 is extended into the outer tube 122; fig. 5 shows a schematic structural view of the intravascular ultrasound catheter 1 with the inner tube 121 extended relative to the outer tube 122. During ultrasonic testing, the retraction device 30 drives the inner tube 121 to gradually extend out of the outer tube 122, i.e., the ultrasonic testing device at the distal end of the drive shaft 13 moves from distal to proximal.

As shown in fig. 8, in the present embodiment, the distal end of the inner tube 121 is located in the water injection cavity 1231 after extending out of the proximal end of the outer tube 122, and the diameter of the distal end of the inner tube 121 is larger than the opening on the right side of the water injection cavity 1231, so that the distal end of the inner tube 121 can be limited to move out of the water injection cavity 1231 from the right side of the water injection cavity 1231, the left side of the limiting seat 123 is fixedly connected with the proximal end of the outer tube 122, the proximal end of the outer tube 122 is communicated with the water injection cavity 1231, and the distal end of the inner tube 121 can pass through the left side of the water injection cavity 1231 and extend into the outer tube 122. When the water injection flushing is performed, the distal end of the inner tube 121 may be moved to the right side region in the water injection cavity 1231, and the liquid injected into the water injection cavity 1231 from the water injection port 1232 may be directly introduced into the support tube 11.

Further, to further facilitate the entry of liquid within the fill cavity 1231 into the support tube 11, in some embodiments, the fill aperture 111 is positioned within the fill cavity 1231 opposite the fill port 1232. Specifically, as shown in fig. 8, the water injection hole 111 is located on the 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, so that 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 formed at the far end of the support tube 11, and the bubble scouring efficiency is improved.

Further, in order to improve the water injection efficiency, the water injection ports 1232 on the limiting seat 123 may be multiple, i.e. may be connected with multiple syringes 50 simultaneously, and the multiple syringes 50 simultaneously inject water into the limiting seat 123, so as to ensure that enough water inflow can wash out bubbles in the lumen, without multiple water injections of a single syringe 50.

As shown in fig. 9, in some embodiments, the water injection holes 111 are provided in plurality, and the plurality of water injection holes 111 are arranged at intervals along the axial direction of the support tube 11, so that the efficiency of water injection scouring bubbles can be further improved. Wherein it may be ensured that at least one water injection hole 111 is located in the water injection cavity 1231, that other water injection holes 111 may be located on the right side of the water injection cavity 1231, i.e. the area where the inner tube 121 is located, or that the water injection holes 111 may also be located on the left side of the water injection cavity 1231, i.e. the area where the outer tube 122 is located.

As shown in fig. 10, in some embodiments, the support tube 11 is provided with a plurality of water injection hole 111 groups spaced along the axial direction of the support tube 11, and each water injection hole 111 group includes a plurality of water injection holes 111 circumferentially arranged around the axis of the support tube 11, so as to further improve the efficiency of water injection and bubble flushing.

As shown in fig. 8 to 10, the intravascular ultrasound catheter 1 according to the embodiment of the application further comprises a sealing member 14 disposed between the inner tube 121 and the limiting seat 123, wherein the sealing member 14 is used for preventing the liquid in the water injection cavity 1231 from overflowing from the gap between the inner tube 121 and the limiting seat 123.

Specifically, the sealing member 14 may be a sealing ring, the limiting seat 123 is provided with a sealing groove, the sealing ring is disposed 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 limiting seat 123 while the tightness between the inner tube 121 and the limiting seat 123 is ensured.

As shown in fig. 4 to 8, the intravascular ultrasound catheter 1 of the embodiment of the application further comprises a connection seat 15 and a communication valve 16, the connection seat 15 is connected with the proximal end of the inner tube 121, and the communication valve 16 is communicated with the water injection port 1232. Specifically, the connecting seat 15 is fixedly connected with the proximal end of the inner tube 121, the inner tube 121 is connected with the retracting device 30 through the connecting seat 15, the injector 50 injects liquid into the water injection cavity 1231 through the communication valve 16, and the communication valve 16 and the limiting seat 123 can be integrally formed. Wherein, the communication valve 16 is a one-way valve, which ensures that the liquid in the water injection cavity 1231 cannot flow out from the water injection port 1232.

In some embodiments, as shown in fig. 11, the communication valve 16 is a one-way three-way valve, and two syringes 50 can be connected at the same time, so as to improve the water injection efficiency.

As shown in fig. 6 and 7, the intravascular ultrasound catheter 1 according to the embodiment of the application further comprises a support seat 17, the support seat 17 is connected with the proximal end of the transmission shaft 13, and the connection seat 15 is sleeved on the support seat 17 and is rotationally connected with the support seat 17. Specifically, the retracting device 30 controls the rotation and movement of the transmission shaft 13 through the supporting seat 17, the supporting seat 17 is fixedly connected with the transmission shaft 13, and the transmission shaft 13 can be in a hypotube structure or a spring structure. The inner cavity of the connecting seat 15 is also provided with a clamping ring 18, and the clamping ring 18 is abutted on the right side of the supporting seat 17 to prevent the supporting seat 17 from being separated from the connecting seat 15.

As shown in fig. 4 to 6, the intravascular ultrasound catheter 1 according to the embodiment of the application further includes a first stress relief tube 19 and a second stress relief tube 20, the first stress relief tube 19 is sleeved at the connection between the inner tube 121 and the connection seat 15, and the second stress relief tube 20 is sleeved at the connection between the outer tube 122 and the support tube 11. Specifically, the proximal end of the inner tube 121 is fixedly connected with the connection seat 15, the distal end of the outer tube 122 is fixedly connected with the support tube 11, the first stress relief tube 19 is used for preventing the inner tube 121 and the connection seat 15 from being bent due to stress concentration, and the second stress relief tube 20 is used for preventing the outer tube 122 and the support tube 11 from being bent due to stress concentration. The first and second de-stressing pipes 19 and 20 may each be made of a softer resin material.

The working principle of the intravascular ultrasound system provided by the embodiment of the application is as follows:

1. the radial artery is punctured percutaneously, and a guiding catheter is placed to reach the coronary artery.

2. Using DSA, contrast agent is driven along the guide catheter to find the target location and into the guidewire to reach the target location.

3. The intravascular ultrasound catheter 1 is flushed with water, and the gas in the catheter is discharged.

4. The intravascular ultrasound catheter 1 enters the target position along the guide wire, the control host machine transmits signals, and the ultrasonic detection device starts to rotate in situ.

5. The intravascular ultrasound catheter 1 withdraws and acquires the intravascular ultrasound image of the whole section to give guidance to the imaging of the operator.

6. The intravascular ultrasound catheter 1 exits the body and the operation is ended.

The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. An intravascular ultrasound catheter, comprising:

support tube, telescopic tube assembly and transmission shaft;

the telescopic pipe assembly comprises an inner pipe, an outer pipe and a limiting seat, wherein the limiting seat is arranged at the proximal end of the outer pipe, a water injection cavity communicated with the outer pipe is arranged in the limiting seat, the limiting seat is sleeved on the inner pipe and is in sliding connection with the inner pipe, and the distal end of the inner pipe can extend into the outer pipe from the water injection cavity and extend from the inner pipe to the water injection cavity; the limit seat is provided with a water injection port communicated with the water injection cavity;

the outer tube, spacing seat with the inner tube is located respectively the cover stay tube, the stay tube with the distal end of outer tube is connected, the transmission shaft is located in the stay tube, be equipped with ultrasonic detection device on the transmission shaft, the stay tube is equipped with the water injection hole, the water injection chamber passes through the water injection hole with the stay tube intercommunication, so that follow the water injection mouth is poured into the liquid of water injection chamber can follow the water injection hole gets into the stay tube.

2. An intravascular ultrasound catheter according to claim 1, wherein:

the water injection hole is positioned in the water injection cavity and is opposite to the water injection port.

3. An intravascular ultrasound catheter according to claim 1, wherein:

the water injection holes are multiple, and the multiple water injection holes are arranged at intervals along the axial direction of the supporting tube.

4. An intravascular ultrasound catheter according to claim 1, wherein:

the water injection hole group comprises a plurality of water injection holes circumferentially arranged around the axis of the support tube.

5. An intravascular ultrasound catheter according to claim 1, wherein:

the sealing piece is arranged between the inner pipe and the limiting seat and is used for preventing liquid in the water injection cavity from overflowing from a gap between the inner pipe and the limiting seat.

6. An intravascular ultrasound catheter according to claim 1, wherein:

still include connecting seat and communication valve, the connecting seat with the proximal end of inner tube is connected, the communication valve with the water injection mouth intercommunication.

7. An intravascular ultrasound catheter according to claim 6, wherein:

the communication valve is a one-way single-way valve or a one-way three-way valve.

8. An intravascular ultrasound catheter according to claim 6, wherein:

the connecting seat is sleeved on the supporting seat and is rotationally connected with the supporting seat.

9. An intravascular ultrasound catheter according to claim 6, wherein:

the connecting seat is characterized by further comprising a first stress relief pipe and a second stress relief pipe, wherein the first stress relief pipe is sleeved at the joint of the inner pipe and the connecting seat, and the second stress relief pipe is sleeved at the joint of the outer pipe and the supporting pipe.

10. An intravascular ultrasound system, comprising:

a retraction device, a retraction base, a syringe and an intravascular ultrasound catheter according to any one of claims 1 to 9;

the injector is communicated with the water injection port, the retraction device is arranged on the retraction base, the retraction device is connected with the proximal end of the inner tube, and the limit seat is connected with the retraction base;

the retraction device is used for driving the transmission shaft to rotate in the supporting tube and move along the axial direction of the supporting tube.

Images