Intravascular imaging catheter

Abstract

The invention belongs to the technical field of medical instruments, and discloses an intravascular imaging catheter. An intravascular imaging catheter includes a first working unit and a second working unit. An opening is formed in the near end of a handle shell of the first working unit, a separation cap is arranged at the far end of the handle shell, the one-way valve is arranged on the separation cap, the waterproof assembly is arranged at the far end of the handle shell, and a separation air cavity is defined between the waterproof assembly and the separation cap; a socket inner core of the second working unit is located in a handle shell, a top ring is fixedly arranged at the far end of the socket inner core, the near end of a connecting rod is inserted into the socket inner core, the far end of the connecting rod sequentially penetrates through the top ring and a waterproof assembly and extends into a liquid inlet cavity, and a probe is arranged at the far end of a driving spring tube. The near end of the driving spring tube extends into the liquid inlet cavity and is connected with the connecting rod, and the near end of the insertion opening inner core is used for penetrating through the opening to be in transmission connection with an external driving source and driving the insertion opening inner core to rotate. According to the invention, bubbles in the liquid in the imaging cavity can be reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an intravascular imaging catheter. Background Technology

[0002] Currently, in the field of medical imaging, imaging catheters, as key medical devices, primarily focus on two main technological directions: Optical Coherence Tomography (OCT) and Intravenous Ultrasound (IVUS). These two types of imaging catheters play a crucial role in the diagnosis and treatment of vascular diseases. With their unique advantages, they provide doctors with detailed information about blood vessels, contributing to precision medicine.

[0003] However, in practical applications of these two types of imaging catheters, existing technologies often employ the method of injecting liquid into the imaging catheter to improve imaging results. This liquid acts similarly to a coupling agent during the imaging process, filling the gap between the imaging catheter and the probe inside the catheter, reducing scattering and attenuation of the light beam or ultrasound waves during propagation, thereby improving the quality of the probe's imaging and resulting in clearer and more accurate vascular images. However, this process also has certain drawbacks. During the injection of liquid into the imaging catheter, air is highly likely to be introduced due to various factors such as the operating environment and injection method. Once air enters the liquid, it forms bubbles of varying sizes. The presence of these bubbles can interfere with the propagation path of the light beam or ultrasound waves, causing abnormal reflected signals and thus reducing the imaging quality of the probe. For example, bubbles may weaken the intensity of the reflected signal or produce artifacts, resulting in blurred or distorted vascular images, affecting the doctor's accurate judgment of vascular lesions and adversely impacting diagnosis and treatment. Summary of the Invention

[0004] The purpose of this invention is to provide an intravascular imaging catheter that reduces air bubbles in the liquid within the imaging cavity.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Intravascular imaging catheters, including:

[0007] The first working unit includes a one-way valve, a waterproof component, and a handle housing. The handle housing has an open port at its proximal end and a separator cap at its distal end. The one-way valve is disposed on the separator cap and communicates with the liquid inlet chamber of the separator cap. The waterproof component is disposed at the distal end of the handle housing. A separator air chamber is formed between the waterproof component and the separator cap, and air in the liquid inlet chamber can enter the separator air chamber.

[0008] The second working unit includes a top ring, a socket inner core, a connecting rod, a drive spring tube, and a probe. The socket inner core is located inside the handle housing. The top ring is fixedly disposed at the distal end of the socket inner core. The proximal end of the connecting rod is inserted into the interior of the socket inner core. The distal end of the connecting rod passes through the top ring and the waterproof component in sequence and extends into the liquid inlet chamber. The probe is disposed at the distal end of the drive spring tube. The proximal end of the drive spring tube extends into the liquid inlet chamber and is connected to the connecting rod. The proximal end of the socket inner core is used to pass through the open port and be connected to an external drive source for transmission. The external drive source is used to drive the socket inner core to rotate.

[0009] As an alternative to intravascular imaging catheters, the septum cap has several circumferentially arranged septa on the side facing the septum air cavity, and the septum air cavity is divided into multiple septate zones.

[0010] As an alternative to intravascular imaging catheters, the surface of the separator is provided with multiple holes and / or multiple grooves.

[0011] As an optional solution for intravascular imaging catheters, the outer wall surface of the insertion core is circumferentially provided with a flange, and the first working unit further includes:

[0012] A retaining ring is fixedly disposed inside the handle housing. The limiting part of the retaining ring is located near the flange. The inner diameter of the limiting part of the retaining ring is smaller than the outer diameter of the flange. The flange stops at the limiting part of the retaining ring.

[0013] As an alternative to intravascular imaging catheters, the circumferential wall of the inner core of the insertion port is provided with a mesh, and the circumferential wall of the handle housing is provided with several drainage holes.

[0014] As an alternative to the intravascular imaging catheter, the intravascular imaging catheter further includes a catheter unit, which includes:

[0015] The travel limiting assembly includes a first fixing head having a first mounting channel, a second fixing head having a second mounting channel, an outer travel tube, and an inner travel tube. The distal end of the outer travel tube is fixedly disposed in the first mounting channel, the proximal end of the outer travel tube is fixedly disposed in the second mounting channel, the distal end of the inner travel tube is located inside the outer travel tube, and the proximal end of the inner travel tube is fixedly connected to the separator cap and communicates with the liquid inlet chamber.

[0016] The distal and proximal tubes are interconnected. The proximal end of the proximal tube passes through the first fixing head, the inner travel tube, and the liquid inlet chamber in sequence, and the proximal tube is fixedly connected to the first fixing head. A waterproof ring is provided on the inner travel tube and is fitted onto the outer wall of the proximal tube. The distal end of the drive spring tube passes through the imaging chamber of the proximal tube and the distal tube in sequence, and the probe is located in the imaging chamber.

[0017] As an alternative to the intravascular imaging catheter, the distal tube is provided with an exhaust port, which is connected to the imaging cavity; and / or the volume of the partition air cavity is greater than the volume of the imaging cavity.

[0018] As an alternative to intravascular imaging catheters, the catheter unit further includes:

[0019] A one-way exhaust valve ring with a valve port is fixedly disposed in the imaging cavity and located near the exhaust port;

[0020] A magnetic pole plug, wherein the magnetic pole plug is slidably disposed within the imaging cavity;

[0021] A return spring, one end of which is located inside the one-way exhaust valve ring and fixedly connected to the one-way exhaust valve ring, and the other end of which is fixedly connected to the magnetic pole plug. The return spring always has the tendency to cause the magnetic pole plug to block the valve port of the one-way exhaust valve ring.

[0022] As an alternative to the intravascular imaging catheter, the second working unit further includes:

[0023] A hemispherical magnetic pole is fixedly disposed at the distal end of the probe. The hemispherical magnetic pole is used to magnetically attract the magnetic pole plug and open the valve port of the one-way exhaust valve ring.

[0024] As an alternative to intravascular imaging catheters, the catheter unit further includes:

[0025] A reinforcing spring is located inside the imaging cavity. One end of the reinforcing spring is fixedly connected to the imaging cavity, and the other end of the reinforcing spring is fixedly connected to the one-way exhaust valve ring.

[0026] The beneficial effects of this invention are:

[0027] The intravascular imaging catheter provided by this invention, after the inner core of the insertion port is connected to an external driving source, can drive the top ring, connecting rod, driving spring tube, and probe to rotate. During rotation, the probe can acquire morphological feature information of the blood vessel wall. When the handle shell retracts in the first direction, the waterproof component presses against the top ring on the inner core of the insertion port, thereby simultaneously driving the inner core of the insertion port to continue retracting in the first direction, so that the probe also retracts a certain distance at a uniform speed during rotation. This coordinated motion of rotation and retraction allows the probe to scan the entire inner wall of a blood vessel of a corresponding length, thus presenting an image of the entire inner wall of the blood vessel of that length. A one-way valve is installed on the separator cap of the handle shell, ensuring that liquid can flow into the inlet chamber of the separator cap without backflow. Since the separator air chamber between the waterproof component and the separator cap is connected to the inlet chamber, most of the air bubbles in the inlet chamber can enter the separator air chamber, reducing the amount of gas entering the catheter's usable section and further improving the imaging quality of the probe. By adding a waterproof component, not only can the connecting rod rotate within the waterproof component, but the liquid in the inlet chamber can also be prevented from leaking towards the inner core of the connector. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the assembly of the intravascular imaging catheter in an embodiment of the present invention;

[0030] Figure 2 This is a cross-sectional view of the intravascular imaging catheter in an embodiment of the present invention;

[0031] Figure 3 This is an assembly diagram of the first working unit in an embodiment of the present invention;

[0032] Figure 4 This is a first cross-sectional view of the tail end of the intravascular imaging catheter in an embodiment of the present invention;

[0033] Figure 5 This is a second cross-sectional view of the end of the intravascular imaging catheter in an embodiment of the present invention;

[0034] Figure 6 This is a cross-sectional view of the one-way valve and the separator cap assembled in an embodiment of the present invention;

[0035] Figure 7 This is a partial cross-sectional view of the catheter unit in an embodiment of the present invention;

[0036] Figure 8 This is a cross-sectional view of the first fixing head in an embodiment of the present invention;

[0037] Figure 9 This is a partial cross-sectional view of the tip of the intravascular imaging catheter in an embodiment of the present invention.

[0038] Figure label:

[0039] 1. First working unit; 2. Second working unit; 3. Conduit unit; 4. First anti-bend sleeve; 5. Second anti-bend sleeve;

[0040] 11. One-way valve; 12. Waterproof assembly; 121. Waterproof base; 122. Waterproof cap; 123. Waterproof plug; 13. Handle housing; 131. Opening; 132. Separator cap; 1321. Liquid inlet chamber; 1322. Separator plate; 133. Square hole; 14. Separator air chamber; 141. Separation zone; 15. Retaining ring; 151. Limiting part;

[0041] 21. Top ring; 22. Inner core of the socket; 221. Flange; 222. Mesh; 23. Connecting rod; 24. Drive spring tube; 25. Probe; 26. Hemispherical magnetic pole;

[0042] 31. First fixing head; 32. Second fixing head; 33. Stroke outer tube; 34. Stroke inner tube; 341. Waterproof ring; 342. Plug; 343. Sleeve; 35. Distal tube; 351. Imaging cavity; 352. Vent hole; 353. Quick exchange head; 3531. Guide wire cavity; 36. Proximal tube; 37. One-way vent valve ring; 371. Valve port; 372. Fixing point; 38. Magnetic pole plug; 39. Return spring; 310. Reinforcing spring. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0047] Currently, in the field of medical imaging, imaging catheters, as key medical devices, primarily focus on two main technological directions: Optical Coherence Tomography (OCT) and Intravenous Ultrasound (IVUS). These two types of imaging catheters play a crucial role in the diagnosis and treatment of vascular diseases. With their unique advantages, they provide physicians with detailed information about the internal structure of blood vessels, contributing to precision medicine.

[0048] During imaging, a probe focuses a light / sound beam onto the blood vessel wall. Simultaneously, the probe doesn't remain stationary but rotates at a high speed, while also retracting uniformly a certain distance during this rotation. This coordinated rotation and retraction allows the probe to scan the entire inner wall of a corresponding length of blood vessel point-by-point and line-by-line, much like a scanner. During this scanning process, the blood vessel wall reflects the light / sound beam, generating reflected optical / acoustic signals. These reflected signals carry rich information about the morphology and structure of the blood vessel wall and are subsequently transmitted to a computer system. The computer software performs a series of complex processes on these reflected signals, including signal reception, amplification, filtering, analysis, and image reconstruction, ultimately generating a complete image and detailed information about the blood vessel, providing doctors with intuitive and accurate diagnostic information.

[0049] However, in practical applications, existing technologies often employ the method of injecting liquid into the imaging catheter to improve imaging results. This liquid acts like a coupling agent during the imaging process, filling the gap between the imaging catheter and the probe inside, reducing scattering and attenuation of the light beam or ultrasound waves during propagation, thereby improving the quality of the probe's imaging and resulting in clearer and more accurate vascular images. However, this process also has certain drawbacks. During the injection of liquid into the imaging catheter, air is highly likely to be introduced due to various factors such as the operating environment and injection method. Once air enters the liquid, it forms bubbles of varying sizes. The presence of these bubbles can interfere with the propagation path of the light beam or ultrasound waves, causing abnormal reflected signals and thus reducing the imaging quality of the probe. For example, bubbles may weaken the intensity of the reflected signal or produce artifacts, resulting in blurred or distorted vascular images, affecting the doctor's accurate judgment of vascular lesions and adversely impacting patient diagnosis and treatment.

[0050] To reduce the amount of gas entering the catheter's working section and improve venting efficiency, this embodiment provides an intravascular imaging catheter, which is described below in conjunction with... Figures 1 to 9 The specific content of this embodiment will be described in detail. It should be noted that, in this embodiment, the proximal end refers to the side of the intravascular imaging catheter closer to the medical staff, the distal end refers to the side of the intravascular imaging catheter closer to the patient, and the first direction refers to... Figure 1 The X direction in the equation.

[0051] The intravascular imaging catheter in this embodiment includes a first working unit 1 and a second working unit 2, which cooperate with each other to achieve the function of intravascular imaging. The first working unit 1 undertakes important functions such as liquid introduction, gas separation, and structural support and motion guidance of the device. The first working unit 1 includes a one-way valve 11, a waterproof component 12, and a handle housing 13.

[0052] The first working unit 1 undertakes important functions such as liquid introduction, gas separation, and structural support and motion guidance for the device. The handle housing 13 serves as the main structure of the first working unit 1. The proximal end of the handle housing 13 has an open port 131, providing a channel for connection between the external drive source and internal components. The distal end of the handle housing 13 has a separator cap 132, which separates different chambers and connects to other components. A one-way valve 11 is located on the separator cap 132 and communicates with the liquid inlet chamber 1321 of the separator cap 132. The unique design of the one-way valve 11 ensures that liquid can only flow into the liquid inlet chamber 1321 in one direction, preventing backflow. This ensures that when liquid is injected into the intravascular imaging catheter, the liquid can stably and continuously enter the designated chamber, providing sufficient liquid medium for subsequent imaging operations and avoiding the impact of liquid backflow on the stability and accuracy of imaging. A waterproof component 12 is located at the distal end of the handle housing 13, forming a gas-separated chamber 14 between the waterproof component 12 and the separator cap 132. The design of this air-separating chamber 14 plays a crucial role. Because air from the inlet chamber 1321 can enter the air-separating chamber 14, when liquid is injected into the inlet chamber 1321, any air bubbles that may be mixed in with the liquid will enter the air-separating chamber 14 under pressure, thereby reducing the amount of gas entering the catheter's working section. It is important to understand that the presence of air bubbles can interfere with the propagation of light beams or ultrasound waves in liquids, leading to signal anomalies and thus reducing image quality. The air-separating chamber 14 effectively solves this problem, allowing less gas to enter the catheter's working section, significantly improving the imaging quality of the catheter probe 25 assembly, and providing doctors with clearer and more accurate vascular images. In the example shown in the accompanying drawings, the handle housing 13 can move forward or backward in a first direction. This mobility provides flexibility and controllability for the operation of the entire device within the blood vessel, allowing doctors to adjust the device's position as needed to obtain more comprehensive vascular information.

[0053] The second working unit 2 is the core imaging part of the intravascular imaging catheter, responsible for realizing the functions of rotating and retracting the catheter probe 25 and acquiring images. The second working unit 2 includes a top ring 21, an inner core 22, a connecting rod 23, a drive spring tube 24, and a probe 25.

[0054] The inner core 22 of the insertion port is located inside the handle housing 13 and is a key component connecting the external drive source and the internal rotating assembly. The top ring 21 is fixedly positioned at the distal end of the inner core 22, providing a stable structural foundation for the insertion of the connecting rod 23. The proximal end of the connecting rod 23 is inserted into the inner core 22, and the distal end passes through the top ring 21 and the waterproof assembly 12, extending into the inlet chamber 1321. This design allows the connecting rod 23 to rotate under the drive of the inner core 22 and to rotate stably within the waterproof assembly 12, while ensuring connection with the drive spring tube 24. The probe 25 is located at the distal end of the drive spring tube 24 and is the component that directly acquires image information of the blood vessel wall. The proximal end of the drive spring tube 24 extends into the inlet chamber 1321 and connects to the connecting rod 23. This connection allows the drive spring tube 24 to rotate with the rotation of the connecting rod 23, thereby driving the probe 25 to rotate. The proximal end of the inner core 22 is used to pass through the opening 131 and connect to an external drive source for transmission. The external drive source is used to drive the inner core 22 to move. When the inner core 22 is connected to the external drive source and receives an image acquisition command, the inner core 22 will start to rotate, thereby driving the top ring 21, connecting rod 23, drive spring tube 24, and probe 25 to rotate synchronously. During the rotation, the probe 25 can collect information from the blood vessel from all directions and perform detailed detection of the blood vessel wall, etc.

[0055] In short, the intravascular imaging catheter provided in this embodiment, because the air-splitting chamber 14 between the waterproof component 12 and the separator cap 132 is connected to the inlet chamber 1321, allows most of the air bubbles in the inlet chamber 1321 to enter the air-splitting chamber 14, reducing the amount of gas entering the catheter's working section and further improving the imaging quality of the probe 25. In the illustrated embodiment, as the handle housing 13 retracts in the first direction, the waterproof component 12 presses against the top ring 21 on the inner core 22 of the insertion port. Since the top ring 21 is fixedly connected to the inner core 22 of the insertion port, it simultaneously drives the inner core 22 of the insertion port to retract in the first direction as well. The drive spring tube 24 is connected to the connecting rod 23, which in turn is connected to the inner core 22 of the insertion port, so the drive spring tube 24 also retracts accordingly, ultimately causing the probe 25 to retract a certain distance at a uniform speed during rotation. This coordinated rotation and retraction motion allows the probe 25 to perform a spiral scan, thereby acquiring information about the corresponding length of blood vessels. By adding the waterproof component 12, on the one hand, the waterproof component 12 ensures the stable rotation of the connecting rod 23 within the waterproof component 12, guaranteeing the smoothness and stability of the rotational movement and improving the reliability and service life of the device. On the other hand, the waterproof component 12 effectively prevents liquid in the liquid inlet chamber 1321 from leaking towards the inner core 22 of the connector. If liquid leaks into the inner core 22 of the connector, it may enter the external drive source, causing damage to the drive source and affecting the normal operation of the entire device. The presence of the waterproof component 12 acts as a robust barrier, preventing liquid leakage, protecting the safety of the external drive source and other internal components, and further improving the overall performance and stability of the device.

[0056] In another embodiment not shown, the handle can be fixed to provide support for the entire system, while the rotation and retraction of the probe are directly driven by an external driving source to move the inner core 22 of the insertion port, thus achieving the acquisition of vascular information.

[0057] Furthermore, the separator cap 132 has several separator plates 1322 arranged circumferentially on the side facing the separator chamber 14, dividing the separator chamber 14 into multiple separator zones 141. The primary advantage of adding multiple separator plates 1322 is its ability to play a crucial role in separating air bubbles. During the process of liquid injection into the inlet chamber 1321, some air bubbles inevitably get mixed in. These bubbles vary in size, and some of the larger bubbles collide with the separator plates 1322 after entering the separator chamber 14. Due to the blocking and separating effect of the separator plates 1322, the large bubbles are divided into multiple smaller bubbles. This process is similar to breaking down a large whole into multiple smaller parts, which significantly reduces the size of the bubbles. The multiple small bubbles formed after the division will remain in multiple separator zones 141 respectively. Each separator zone 141 is like an independent small container, confining the small bubbles within a certain range and preventing the bubbles from moving randomly. This confinement function has many important implications. On the one hand, it reduces the disordered flow of bubbles within the separating gas chamber 14, making the bubble distribution more uniform and stable, which is beneficial for subsequent processing and removal of the bubbles. On the other hand, it avoids the impact and disturbance that large bubbles may cause during movement, which could adversely affect the liquid flow state within the liquid inlet chamber 1321, thereby interfering with the imaging stability of the catheter probe 25 assembly. Small bubbles, due to their small size and light weight, move more smoothly within the separating area 141, and have a relatively smaller impact on the liquid flow. Optionally, the surface of the separating plate 1322 is provided with multiple holes and / or multiple grooves. The separating plate has a porous or grooved structure, which can more efficiently capture bubbles. While the bubbles enter the separating gas chamber and are separated into small bubbles by multiple separating plates, the small bubbles will be retained inside the porous structure and grooves due to the porous or grooved structure of the separating plates, preventing the random movement of small bubbles and ensuring that the bubbles in the separating gas chamber do not move towards the imaging chamber.

[0058] Furthermore, a flange 221 is circumferentially provided on the outer wall surface of the inner core 22 of the insertion port. The first working unit 1 also includes a retaining ring 15, which is fixedly disposed inside the handle housing 13 (exemplarily, the retaining ring 15 is connected to the square hole 133 on the handle housing 13 by a snap-fit ​​method). The limiting part 151 of the retaining ring 15 is located at the proximal end of the flange 221. The inner diameter of the limiting part 151 of the retaining ring 15 is smaller than the outer diameter of the flange 221. This dimensional difference is the key to the entire anti-disengagement structure, which effectively blocks the flange 221 in the axial direction, so that the flange 221 stops at the limiting part 151 of the retaining ring 15. In actual operation, medical personnel may apply a pulling force to the intravascular imaging catheter for various reasons. For example, when adjusting the position of the device or pulling out the device, if there is no effective anti-disengagement structure between the inner core 22 of the insertion port and the handle housing 13, the strong pulling force may cause the inner core 22 of the insertion port to slide out from inside the handle housing 13, which may not only damage the device, but also cause harm to the patient. The added retaining ring 15, through its limiting part 151, blocks the flange 221, forming a robust defense. No matter how much pulling force is applied, as long as it does not exceed the structural strength limit of the device, the flange 221 will be firmly restrained between the limiting part 151 of the retaining ring 15 and the inside of the handle housing 13, thereby effectively preventing the inner core 22 of the socket from detaching from the inside of the handle housing 13 and ensuring the integrity and safety of the device during operation.

[0059] Furthermore, the circumferential wall of the inner core 22 is provided with mesh openings 222. The shape of each mesh opening 222 may be circular, elliptical, or other regular polygons, and its size is determined comprehensively based on factors such as the dimensions of the inner core 22, the properties of the internal fluid, and the rotation speed, to ensure optimal fluid drainage. When the intravascular imaging catheter is activated and the inner core 22 begins to rotate at high speed, the mesh openings 222 begin to play their crucial role. In physics, when an object rotates at high speed, the substances inside it are subject to centrifugal force. The fluid inside the inner core 22 is also affected by this centrifugal force. The added mesh openings 222 provide a convenient drainage channel for the fluid. Under centrifugal force, liquid molecules move away from the center of rotation, and the presence of the mesh openings 222 allows the fluid to be smoothly drained from inside the inner core 22. Optionally, the circumferential wall of the handle housing 13 is provided with several drainage holes. The drained liquid is discharged through these holes or directly from the open port 131 at the near end of the handle housing 13 via the drain port of the external drive source. Timely drainage prevents liquid from accumulating inside the connector core 22. Excessive liquid accumulation inside the connector core 22 increases its weight and moment of inertia, affecting its rotational stability and speed. Timely drainage through the mesh 222 maintains the lightweight nature of the connector core 22, making it more stable during high-speed rotation and reducing vibration and deviation caused by weight changes.

[0060] Furthermore, the waterproof assembly 12 includes a waterproof base 121, a waterproof cap 122, and a waterproof plug 123. The waterproof base 121 is fixedly mounted on the distal end of the handle housing 13 to ensure that it will not loosen or fall off during use. The waterproof base 121 has a first through hole, which allows the connecting rod 23 to pass through smoothly. The waterproof cap 122 is fastened to the waterproof base 121 and sealed to it. At the connection between the waterproof cap 122 and the waterproof base 121, sealant or interference fit is used to ensure that there are no gaps between them, thereby effectively preventing liquid infiltration. A filling chamber is formed between the waterproof cap 122 and the waterproof base 121. This filling chamber provides independent space for the installation of the waterproof plug 123 and also provides the possibility of further improving waterproof performance. The waterproof cap 122 has a second through hole. The waterproof plug 123 is disposed in the filling chamber and is a key component for the waterproof assembly 12 to achieve its sealing function. The waterproof plug 123 can be made of materials with good elasticity and sealing properties, such as rubber or silicone. These materials not only have softness, allowing them to conform well to the surface of the connecting rod 23, but also possess a certain degree of wear resistance and corrosion resistance, maintaining stable performance during long-term use. The waterproof plug 123 has a third through hole; the first, third, and second through holes are coaxially connected, and the connecting rod 23 passes through these holes. Notably, the inner diameter of the third through hole of the waterproof plug 123 is smaller than the outer diameter of the connecting rod 23. This design allows the waterproof plug 123 to elastically deform when the connecting rod 23 passes through, thus tightly gripping the connecting rod 23. This gripping action generates strong friction, effectively preventing liquid leakage through the through hole and providing a reliable waterproof barrier for the device's interior. Regarding the rotation of the connecting rod 23, although the waterproof plug 123 generates a gripping friction force on the connecting rod 23, the rotational force of the connecting rod 23 driven by the inner core 22 of the socket is greater than the gripping friction force between the waterproof plug 123 and the connecting rod 23. This force balance allows the connecting rod 23 to rotate normally even under the tight enclosure of the waterproof plug 123, without affecting the smoothness of rotation due to excessive friction. At the same time, the elastic material of the waterproof plug 123 can also buffer the vibration and impact generated during the rotation of the connecting rod 23 to a certain extent, reducing the impact on other components of the device and improving the overall stability and reliability of the device.

[0061] The fixed connection between the waterproof base 121 and the handle housing 13, the sealed connection between the waterproof cover 122 and the waterproof base 121, and the tight seal of the waterproof plug 123 on the connecting rod 23 form a series of tight defenses, effectively preventing liquid from seeping into the proximal end. Even under high pressure or liquid impact, it ensures that the electronic components and mechanical parts inside the device are not damaged by liquid, thus guaranteeing the normal operation and service life of the device. The connecting rod 23 inside the insert core 22 passes through the top ring 21, the waterproof base 121, the waterproof plug 123, the waterproof cover 122, and is fixedly connected to the drive spring tube 24. This connection method not only ensures the stable connection between the components but also enables the effective transmission of power, ensuring that the various functional modules of the device can work together to achieve accurate and clear intravascular imaging.

[0062] Furthermore, the intravascular imaging catheter also includes catheter unit 3, which comprises a travel limiting component, a distal tube 35, and a proximal tube 36. The distal tube 35 and proximal tube 36 are interconnected and communicate with each other, forming the main channels for fluid and signal transmission. The distal tube 35 is responsible for penetrating deep into the blood vessel and approaching the area requiring imaging. The distal tube 35 is made of a soft, transparent material to ensure flexible movement within the blood vessel without damaging the vessel wall. The proximal tube 36 is made of a harder material.

[0063] The travel limiting assembly includes a first fixing head 31 with a first mounting channel, a second fixing head 32 with a second mounting channel, an outer travel tube 33, and an inner travel tube 34. The first fixing head 31 and the second fixing head 32 serve as fixing bases for the travel limiting assembly and are located at opposite ends of the outer travel tube 33. The first and second mounting channels provide a secure connection to the outer travel tube 33. The distal end of the outer travel tube 33 is fixedly positioned within the first mounting channel, and the proximal end is fixedly positioned within the second mounting channel, providing reliable protection for the inner travel tube 34. The addition of the outer travel tube 33 effectively prevents damage to the inner travel tube 34 from external forces, extends the service life of the inner travel tube 34, and ensures the normal operation of the catheter unit 3. The distal end of the inner travel tube 34 is located inside the outer travel tube 33, and the proximal end of the inner travel tube 34 is fixedly connected to the separator cap 132 and communicates with the inlet chamber 1321. The proximal end of the proximal tube 36 is sequentially inserted into the first fixing head 31, the inner travel tube 34, and the inlet chamber 1321, and the proximal tube 36 is fixedly connected to the first fixing head 31. This connection method makes the proximal tube 36 and the travel limiting assembly form a stable whole, and there will be no loosening or displacement during operation. In order to prevent irreversible bending of the catheter unit 3, a first anti-bend sleeve 4 is provided at the distal end of the first fixing head 31, and a second anti-bend sleeve 5 is provided at the proximal end of the second fixing head 32.

[0064] Furthermore, a waterproof ring 341 is provided on the inner travel tube 34, and the waterproof ring 341 is fitted onto the outer wall of the proximal tube 36. The waterproof ring 341 is made of a special sealing material and has good elasticity and sealing performance. Specifically, the waterproof ring 341 is fixed to the proximal tube 36 at the end of the inner travel tube 34 near the first fixed head 31 by a sleeve 343 and a plug 342 of the inner travel tube 34. The sleeve 343 surrounds and compresses the proximal tube 36, thereby achieving a waterproof seal. This waterproof design can effectively prevent liquid from leaking from the gap between the proximal tube 36 and the inner travel tube 34. The inner travel tube 34 can slide on the proximal tube 36 with the waterproof ring 341. This sliding design allows the inner travel tube 34 to move relative to the proximal tube 36 according to operational needs, thereby achieving precise control of the probe 25. Specifically, the proximal tube 36 passes through and is fixedly connected to the first fixed head 31, while the first fixed head 31 is fixedly connected to the distal end of the outer travel tube 33. The inner travel tube 34 is located inside the outer travel tube 33, with its proximal end inserted into and fixed within the separator cap 132. The proximal tube 36 extends through the inner travel tube 34 into the separator cap 132 without being fixed, ensuring that the proximal tube 36 is also located within the inner travel tube 34. This layout design ensures stable connections between components while providing sufficient space for the sliding of the inner travel tube 34.

[0065] Furthermore, the distal end of the drive spring tube 24 is sequentially inserted into the imaging cavity 351 of the proximal tube 36 and the distal tube 35, with the probe 25 located within the imaging cavity 351. The drive spring tube 24 possesses excellent flexibility and elasticity, allowing it to flexibly deform within the blood vessel as the catheter bends, while simultaneously transmitting sufficient power to drive the probe 25. The drive spring tube 24 extends sequentially through the distal tube 35, the proximal tube 36, and the inner travel tube 34 to the inner core 22 of the insertion port, where it is fixedly connected. When the second fixing head 32 is fixed by the external structure, the drive handle housing 13 moves backward, and the movement of the handle is transmitted to the inner travel tube 34, thereby causing the inner travel tube 34 and the drive spring tube 24 to move backward. Since the probe 25 is connected to the drive spring tube 24, the probe 25 also moves within the distal tube 35. This design allows the operator to precisely adjust the position of the probe 25 within the blood vessel externally by controlling the position of the handle, thereby acquiring vascular images from different locations and improving the accuracy and comprehensiveness of the imaging.

[0066] Furthermore, the distal tube 35 is equipped with a vent 352, which is connected to the imaging chamber 351. During intravascular imaging, air bubbles inevitably mix in as the fluid flows within the catheter. If these air bubbles remain in the imaging chamber 351, they will severely interfere with the imaging effect. Air bubbles will form artifacts in the image, causing blurry images and making it difficult for doctors to accurately judge the actual condition of the blood vessels, thus affecting the accuracy of the diagnosis. The vent 352 cleverly solves this problem. When the fluid flows within the distal tube 35, the air bubbles will gradually flow to the vent 352. Since the vent 352 is connected to the imaging chamber 351, the air bubbles can be smoothly discharged from the vent 352, ensuring that the imaging chamber 351 is filled with pure fluid. This greatly improves the clarity and accuracy of the image, providing doctors with a more reliable diagnostic basis.

[0067] In this embodiment, the liquid within the inlet chamber 1321 inside the separator cap 132 has two clearly defined and reasonable flow paths. One path flows to the distal end, passing sequentially through the proximal tube 36 and the distal tube 35. This path is primarily responsible for delivering the liquid to the imaging chamber 351 within the distal tube 35, providing the necessary medium for the imaging process and enhancing the imaging effect on the blood vessels. The other path flows to the proximal end, specifically to the four separator zones 141. These four separator zones 141 can accommodate most of the air bubbles. Preferably, the volume of the gas separator chamber 14 is much larger than the volume of the imaging chamber 351 (i.e., the volume of the channel formed by the proximal tube 36 and the distal tube 35). Thus, most of the gas will enter the four separator zones 141 and be separated and stored in four independent chambers by the four separator plates 1322. This reduces the amount of gas entering the imaging chamber, thereby improving the overall venting efficiency of the catheter, saving surgical time, and improving surgical efficiency.

[0068] Furthermore, the distal tube 35 has a guidewire lumen 3531 on its rapid exchange head 353. The guidewire plays a crucial role in vascular interventional procedures, allowing it to enter the tissue beforehand. In practice, the physician first inserts the guidewire along the vascular path into the tissue near the target location. The guidewire possesses excellent flexibility and guidance, allowing it to pass smoothly through bends and branches in the blood vessel while maintaining a certain rigidity to prevent arbitrary bending or entanglement within the vessel. Then, the physician advances the intravascular imaging catheter along the guidewire. Because the guidewire has pre-defined a path for the device, the catheter can move smoothly to the target vessel under its precise guidance. This method significantly improves the accuracy and speed of the catheter reaching the target location, reduces the blindness and uncertainty during the procedure, lowers the risk of vascular damage, shortens the operation time, and alleviates patient discomfort.

[0069] Furthermore, the conduit unit 3 also includes a one-way exhaust valve ring 37 with a valve port 371, a magnetic pole plug 38, and a return spring 39. The one-way exhaust valve ring 37 is fixedly disposed in the imaging cavity 351 and located near the exhaust port 352; the magnetic pole plug 38 is slidably disposed in the imaging cavity 351; one end of the return spring 39 is located in the one-way exhaust valve ring 37 and is fixedly connected to the one-way exhaust valve ring 37, and the other end of the return spring 39 is fixedly connected to the magnetic pole plug 38. The return spring 39 always tends to cause the magnetic pole plug 38 to block the valve port 371 of the one-way exhaust valve ring 37. This tension design ensures that the valve port 371 is in the closed state when there is no external force, effectively preventing external substances from accidentally entering the imaging cavity 351 and ensuring the cleanliness and stability of the device.

[0070] When venting is required, the operator can use external force to pull the magnetic pole plug 38. This external force overcomes the tension of the return spring 39, causing the magnetic pole plug 38 to disengage from the one-way vent valve ring 37. The previously blocked valve port 371 opens instantly, allowing gas to be smoothly discharged through the vent hole 352. This venting method is simple and direct, and the operator can flexibly control the venting time according to the actual situation to ensure that the venting process is thorough and effective. Once the venting operation is completed and the external force applied to the magnetic pole plug 38 is removed, the return spring 39 immediately takes effect. With its strong elastic restoring force, it quickly pulls the magnetic pole plug 38 back to a position close to the one-way vent valve ring 37 and tightly blocks the valve port 371, thereby preventing the vent hole 352 from continuing to vent and preventing liquid, air, or other impurities outside the conduit from entering the imaging cavity in subsequent operations, which could adversely affect the imaging quality or device performance.

[0071] Furthermore, the second working unit 2 also includes a hemispherical magnetic pole 26, which increases the automation level of the exhaust control mechanism. The hemispherical magnetic pole 26 is fixedly installed at the distal end of the probe 25. Its unique hemispherical shape design increases the contact area with the magnetic pole plug 38, improving the stability and reliability of the magnetic attraction. The main function of the hemispherical magnetic pole 26 is to open the valve port 371 of the one-way exhaust valve ring 37 by magnetically attracting the magnetic pole plug 38. In the exhaust state, the hemispherical magnetic pole 26 at the distal end of the probe 25 attracts the magnetic pole plug 38. This strong magnetic attraction overcomes the tension of the return spring 39, stretches the return spring 39, and causes the magnetic pole plug 38 to disengage from the one-way exhaust valve ring 37, thereby connecting the imaging cavity 351 with the exhaust port 352, allowing the gas to be discharged freely. After the venting is completed, in order to ensure that the vent hole 352 can be closed in time and prevent the backflow of external substances, the drive spring tube 24 is moved a certain distance to the near end, so that the hemispherical magnetic pole 26 and the magnetic pole plug 38 are separated by a certain distance. This distance satisfies that the attraction between the two is less than the tension of the return spring 39. The return spring 39 drives the magnetic pole plug 38 to seal the valve port 371, thus completing the venting.

[0072] Optionally, firstly, the second fixing head 32 is fixed. This step provides a stable reference point for subsequent operations, preventing unnecessary movement or shaking of the entire conduit unit 3 during operation. Then, the handle housing 13 is pulled back. The movement of the handle housing 13 is transmitted to the inner core 22 of the socket, causing the inner core 22 and the travel inner tube 34 to move backward a certain distance. Since the drive spring tube 24 is connected to the inner core 22 of the socket, the backward movement of the inner core 22 will cause the drive spring tube 24 to move backward as well. Finally, the backward movement of the drive spring tube 24 will cause the hemispherical magnetic pole 26 connected to it to move backward, separating the hemispherical magnetic pole 26 from the magnetic pole plug 38 by a certain distance. As the distance between the hemispherical magnetic pole 26 and the magnetic pole plug 38 increases, the magnetic attraction between them gradually decreases. When the attraction between the two is less than the pulling force of the return spring 39, the return spring 39 immediately takes effect, returning the magnetic pole plug 38 into the one-way exhaust valve ring 37, tightly blocking the exhaust hole 352. This process enables the automatic closure of the vent 352, ensuring the sealing and stability of the internal environment of the catheter, preventing external substances from returning to the catheter, and providing a reliable guarantee for subsequent imaging operations. Optionally, in another embodiment not shown, the system controls an external drive source to move the inner core 22 of the connector a specified distance proximally, so as to seal the valve port after venting is completed.

[0073] Furthermore, the conduit unit 3 also includes a reinforcing spring 310, which is located within the imaging cavity 351. One end of the reinforcing spring 310 is fixedly connected to the distal end of the imaging cavity 351, and the other end is fixedly connected to the one-way exhaust valve ring 37. Through this connection method, the reinforcing spring 310 forms a strong support structure within the imaging cavity 351.

[0074] In intravascular imaging procedures, catheters need to be inserted into various parts of the blood vessel, especially in areas with greater curvature. In these areas, the catheter is easily subjected to compression and bending forces from the vessel wall, causing the distal tube 35 to bend and deform. The presence of the reinforcing spring 310 acts like a strong skeleton for the distal tube 35. When the distal tube 35 is subjected to external force attempting to bend, the reinforcing spring 310 generates a counter-elastic force to resist this bending tendency, thereby effectively improving the bending resistance of the distal tube 35. This enhanced bending resistance allows the catheter to pass more smoothly within the blood vessel, reducing operational difficulties and imaging interference caused by bending deformation, and ensuring the stability and accuracy of the imaging process.

[0075] In this embodiment, the venting principle of the intravascular imaging catheter is as follows: a reinforcing spring 310 is fixed to the distal end of the imaging chamber 351, and the proximal end of the reinforcing spring 310 is connected to a fixing point 372 on the one-way venting valve ring 37. This arrangement allows the reinforcing spring 310 and the one-way venting valve ring 37 to form an organic whole, jointly providing support for the stable operation of the catheter unit 3. A venting port 352 is provided on the distal tube 35, and the venting port 352 is located at the distal end of the one-way venting valve ring 37. This design allows the venting port 352 to work in conjunction with the one-way venting valve ring 37. When venting is required, gas can be smoothly discharged through the venting port 352, while the one-way venting valve ring 37 can control the timing and flow rate of venting.

[0076] A return spring 39 is fixedly connected inside the one-way exhaust valve ring 37. One end of the return spring 39 is firmly connected to a fixed point 372 on the one-way exhaust valve ring 37, and the other end is connected to the magnetic pole plug 38. The return spring 39 is always in a pre-tightened state, which tends to move the magnetic pole plug 38 closer to the one-way exhaust valve ring 37. Under the action of the return spring 39, the magnetic pole plug 38 can accurately move to the position of contact with the one-way exhaust valve ring 37 and tightly seal the proximal end of the one-way exhaust valve ring 37. This sealing state effectively prevents substances outside the catheter from entering the imaging cavity, ensuring the cleanliness and stability of the imaging cavity. The N pole and S pole of the magnetic pole plug 38 are symmetrically distributed with respect to the central axis of the catheter. This symmetrical design allows the magnetic pole plug 38 to be subjected to a uniform force in the magnetic field, thereby ensuring the stability and accuracy of its movement. Meanwhile, the maximum outer diameter of the magnetic pole plug 38 is smaller than the inner diameter of the distal tube 35. This size design ensures that the magnetic pole plug 38 can move freely in the distal tube 35 without obstructing the flow of liquid and the discharge of gas in the tube, thus ensuring unobstructed passage.

[0077] The probe 25 is located near the proximal end of the magnetic pole plug 38, and the distal end of the probe 25 is a hemispherical magnetic pole 26. The hemispherical magnetic pole 26 also has N and S poles and is symmetrical about the central axis of the conduit. The hemispherical magnetic pole 26 engages with the semi-circular groove on the magnetic pole plug 38, a fit similar to a key into a lock, enabling precise alignment and a stable connection. When the hemispherical magnetic pole 26 approaches the magnetic pole plug 38, the interaction force between the magnetic poles attracts the magnetic pole plug 38, causing it to move against the tension of the return spring 39, thereby opening the valve port 371 of the one-way exhaust valve ring 37 to perform the exhaust operation. After exhaust is complete, when the hemispherical magnetic pole 26 separates from the magnetic pole plug 38 by a certain distance, the elastic force of the return spring 39 pulls the magnetic pole plug 38 back to its original position, re-closing the proximal end of the one-way exhaust valve ring 37.

[0078] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An intravascular imaging catheter, characterized in that, include: The first working unit (1) includes a one-way valve (11), a waterproof component (12), and a handle shell (13). The handle shell (13) has an open port (131) at its proximal end and a separator cap (132) at its distal end. The one-way valve (11) is disposed on the separator cap (132) and communicates with the liquid inlet chamber (1321) of the separator cap (132). The waterproof component (12) is disposed at the distal end of the handle shell (13). A separator air chamber (14) is formed between the waterproof component (12) and the separator cap (132). Air in the liquid inlet chamber (1321) can enter the separator air chamber (14). The second working unit (2) includes a top ring (21), a socket inner core (22), a connecting rod (23), a drive spring tube (24), and a probe (25). The socket inner core (22) is located inside the handle housing (13). The top ring (21) is fixedly disposed at the distal end of the socket inner core (22). The proximal end of the connecting rod (23) is inserted into the interior of the socket inner core (22). The distal end of the connecting rod (23) passes through the top ring (21) and the probe (25) in sequence. The waterproof component (12) extends into the liquid inlet chamber (1321), the probe (25) is located at the distal end of the drive spring tube (24), the proximal end of the drive spring tube (24) extends into the liquid inlet chamber (1321) and is connected to the connecting rod (23), the proximal end of the socket core (22) is used to pass through the opening (131) and be connected to an external drive source, and the external drive source is used to drive the socket core (22) to rotate.

2. The intravascular imaging catheter according to claim 1, characterized in that, The separator cap (132) has several separator plates (1322) arranged circumferentially on the side facing the separator air cavity (14), and the separator air cavity (14) is divided into multiple separator areas (141).

3. The intravascular imaging catheter according to claim 2, characterized in that, The surface of the partition plate (1322) is provided with multiple holes and / or multiple grooves.

4. The intravascular imaging catheter according to claim 1, characterized in that, The outer wall surface of the socket inner core (22) is provided with a flange (221) in the circumferential direction, and the first working unit (1) further includes: A retaining ring (15) is fixedly disposed inside the handle housing (13). The limiting part (151) of the retaining ring (15) is located near the flange (221). The inner diameter of the limiting part (151) of the retaining ring (15) is smaller than the outer diameter of the flange (221). The flange (221) stops at the limiting part (151) of the retaining ring (15).

5. The intravascular imaging catheter according to claim 1, characterized in that, The inner core (22) of the socket is provided with a mesh (222) on its circumferential wall, and the handle shell (13) is provided with a number of drainage holes on its circumferential wall.

6. The intravascular imaging catheter according to any one of claims 1-5, characterized in that, The intravascular imaging catheter further includes a catheter unit (3), which comprises: The travel limiting assembly includes a first fixing head (31) having a first mounting channel, a second fixing head (32) having a second mounting channel, a travel outer tube (33) and a travel inner tube (34). The distal end of the travel outer tube (33) is fixedly disposed in the first mounting channel, the proximal end of the travel outer tube (33) is fixedly disposed in the second mounting channel, the distal end of the travel inner tube (34) is located inside the travel outer tube (33), and the proximal end of the travel inner tube (34) is fixedly connected to the separator cap (132) and communicates with the liquid inlet chamber (1321). The distal tube (35) and proximal tube (36) are interconnected. The proximal end of the proximal tube (36) is sequentially inserted into the first fixing head (31), the inner travel tube (34), and the liquid inlet chamber (1321), and the proximal tube (36) is fixedly connected to the first fixing head (31). A waterproof ring (341) is provided on the inner travel tube (34), and the waterproof ring (341) is sleeved on the outer wall of the proximal tube (36). The distal end of the drive spring tube (24) is sequentially inserted into the imaging cavity (351) of the proximal tube (36) and the distal tube (35), and the probe (25) is located in the imaging cavity (351).

7. The intravascular imaging catheter according to claim 6, characterized in that, The distal tube (35) is provided with an exhaust port (352), which is connected to the imaging cavity (351); and / or the volume of the partition gas cavity (14) is greater than the volume of the imaging cavity (351).

8. The intravascular imaging catheter according to claim 7, characterized in that, The catheter unit (3) also includes: A one-way exhaust valve ring (37) having a valve port (371) is fixedly disposed in the imaging cavity (351) and located near the exhaust port (352); A magnetic pole plug (38) is slidably disposed within the imaging cavity (351); A return spring (39) is provided, one end of which is located inside the one-way exhaust valve ring (37) and fixedly connected to the one-way exhaust valve ring (37). The other end of the return spring (39) is fixedly connected to the magnetic pole plug (38). The return spring (39) always has the tendency to cause the magnetic pole plug (38) to block the valve port (371) of the one-way exhaust valve ring (37).

9. The intravascular imaging catheter according to claim 8, characterized in that, The second working unit (2) also includes: A hemispherical magnetic pole (26) is fixedly disposed at the distal end of the probe (25). The hemispherical magnetic pole (26) is used to magnetically attract the magnetic pole plug (38) and open the valve port (371) of the one-way exhaust valve ring (37).

10. The intravascular imaging catheter according to claim 8, characterized in that, The catheter unit (3) also includes: A reinforcing spring (310) is located inside the imaging cavity (351). One end of the reinforcing spring (310) is fixedly connected to the imaging cavity (351), and the other end of the reinforcing spring (310) is fixedly connected to the one-way exhaust valve ring (37).

Images