An interventional imaging catheter and imaging system

Abstract

This application relates to an interventional imaging catheter and imaging system. The interventional imaging catheter includes: a catheter body, a rotation drive device, and a signal processing device. The catheter body includes a guide head, a probe, and a protective sheath. The probe is mounted between the guide head and the protective sheath, and the detection part of the probe is exposed relative to the guide head and the protective sheath. The protective sheath contains a signal transmission tube and a drive transmission tube, which are respectively connected to the probe. Under the electromagnetic action of the rotation drive device, the drive transmission tube drives the probe to rotate relative to the guide head and the protective sheath, and performs detection and imaging. A support tube is also included for the guidewire to pass through. This application can effectively avoid the influence of the outer sheath on the probe signal attenuation, eliminate guidewire imaging artifacts, reduce drive vibration noise, and make probe operation and imaging more stable.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to an interventional imaging catheter and imaging system. Background Technology

[0002] In the field of interventional imaging catheters, an outer sheath is typically used to enclose the internal probe and transmission structure to protect the probe and facilitate its advancement within cavities such as blood vessels. During imaging, the probe needs to emit light or sound signals and receive echoes, while simultaneously requiring a guidewire for guidance and positioning.

[0003] In existing interventional imaging catheter structures, signal and power transmission mostly adopts contact-type drive and wired signal connection methods.

[0004] The material of the outer sheath absorbs, scatters, or reflects the light or sound signals emitted by the probe to a certain extent, causing the signal to attenuate when passing through the sheath, reducing the signal-to-noise ratio at the receiving end, and ultimately resulting in a blurred and poorly contrasted image, which affects the accuracy of lesion identification.

[0005] Traditional catheters typically place the guidewire channel and probe in the same radial plane or in front of the probe. During imaging, the guidewire partially blocks the signal emitted by the probe, resulting in obvious guidewire artifacts in the reconstructed image. This leads to the loss of true detection data in the area behind the guidewire, resulting in incomplete diagnostic information.

[0006] In mechanical contact drive systems, friction, gaps, and eccentric movements between transmission components can introduce non-uniform vibrations and noise, causing the probe to jitter in position or angle during scanning. This can lead to geometric distortion, fringe artifacts, or instability on the time axis, reducing image quality and measurement repeatability. Summary of the Invention

[0007] The purpose of this application is to provide an interventional imaging catheter and imaging system that can effectively avoid the influence of the outer sheath on the probe signal attenuation, eliminate guidewire imaging artifacts, reduce drive vibration noise, and make probe operation and imaging more stable.

[0008] To achieve the above objectives, in a first aspect, the present invention provides an interventional imaging catheter, comprising: a catheter body, a rotation drive device, and a signal processing device; The catheter body includes a guide head, a probe, and a protective sheath arranged sequentially from distal to proximal. The probe is mounted between the guide head and the protective sheath, and the detection part of the probe is exposed to the outside relative to the guide head and the protective sheath. The protective sheath is internally provided with an inner and outer stacked signal transmission tube and a drive transmission tube, which are respectively connected to the probe. The drive transmission tube rotates under the electromagnetic action of the rotary drive device through electromagnetic coupling, thereby driving the probe to rotate relative to the guide head and the protective sheath, and combining the signal processing device to detect and image during the rotation process; And a support tube for guiding the guidewire through, the distal end of the support tube being disposed inside the guide head, and the support tube passing through the probe and the signal transmission tube, and extending outward from the proximal end of the protective sheath and the signal processing device.

[0009] In an optional embodiment, the probe includes mounting portions at both ends along the axial direction and an exposed portion in the middle. The mounting portions at both ends are respectively fitted with the guide head and the protective sheath in a clearance fit and limit locking manner, so that the probe can rotate relative to the guide head and the protective sheath. The exposed portion serves as the probe's detection area, isolated between the proximal end of the guide head and the distal end of the protective sheath.

[0010] In an optional embodiment, the probe has an H-shaped longitudinal section, and the exposed portion has a radially concave structure relative to the assembly portion.

[0011] In an optional embodiment, the guide head includes a pointed cone-shaped structure, and a tip guide wire hole is provided at the distal tip of the guide head; The distal end of the support tube is fixedly connected to the inside of the guide head; The support tube includes a straight-through guide wire cavity, the distal end of which is directly connected to the tip guide wire hole.

[0012] In an optional embodiment, the support tube is located at the very center of the catheter body and is entirely penetrated by the internal center of the probe.

[0013] In an optional embodiment, the probe and the signal transmission tube are respectively fitted with the support tube with a clearance, and the proximal end of the protective sheath and the signal processing device are both fixedly connected to the support tube.

[0014] In an optional embodiment, the assembly part includes a proximal assembly part and a distal assembly part, the proximal assembly part and the distal assembly part respectively including a limiting step, the limiting steps being disposed opposite to each other on both sides of the exposed part.

[0015] In an optional embodiment, the proximal gap of the guide head covers the outside of the distal assembly, and the distal gap of the protective sheath covers the outside of the proximal assembly.

[0016] In an optional embodiment, the drive transmission tube is clearance-fitted with the protective sheath, and the proximal portion of the protective sheath is fixedly accommodated in the drive groove of the rotary drive device.

[0017] In a second aspect, the present invention provides an imaging system, including a reciprocating drive device, an imaging terminal, and an interventional imaging catheter as described in any of the foregoing embodiments, wherein the reciprocating drive device is used for pushing and pulling control of the interventional imaging catheter in a blood vessel. After the interventional imaging catheter is pushed or pulled into place, the signal processing device is used to transmit photoelectric signals to the probe through coupling, and combine with the imaging terminal to detect and image the internal state of the blood vessel.

[0018] The interventional imaging catheter and imaging system described in this application can prevent damage to the detection location during high-speed probe operation. The detection part of the probe is exposed to the outside relative to the guide head and protective sheath, which can reduce signal loss and improve the clarity of detection imaging.

[0019] The support tube through which the guidewire passes provides good support for the guide head and protective sheath. It also connects with the guidewire hole at the tip of the guide head to form a guidewire cavity, preventing the guidewire from blocking part of the detection signal after it is inserted, avoiding the generation of guidewire artifacts, and making the diagnostic information of the detection position more complete.

[0020] The electromagnetic coupling drive enables high-speed rotation of the probe, achieving high frame rate imaging, while avoiding the vibration and noise of mechanical contact drive, ensuring image quality and repeatability of detection.

[0021] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the external structure of the interventional imaging catheter of this application; Figure 2 This is a schematic diagram of the internal structure of the interventional imaging catheter of this application; Figure 3 for Figure 2 A magnified schematic diagram of a portion of the structure.

[0024] icon: 1-Catheter body; 11-Signal transmission tube; 12-Drive transmission tube; 2- Rotary drive device; 21- Drive slot; 3-Signal processing device; 4-Probe; 41-Assembly section; 411-Proximal assembly section; 412-Distal assembly section; 413-Limiting step; 42-Exposed section; 5-Guide head; 51-Tip guide wire hole; 6- Protective sheath; 7-Support tube; 71-Guide wire cavity. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The interventional imaging catheter and imaging system in this application are mainly used to solve technical problems such as signal attenuation, guidewire artifacts and drive vibration noise in existing interventional imaging catheters.

[0029] See Figure 1 and combined Figures 2-3 The interventional imaging catheter in this application mainly comprises: a catheter body 1, a rotation drive device 2, and a signal processing device 3.

[0030] The catheter body 1, as the specific execution part of the interventional imaging catheter, includes a guide head 5, a probe 4, and a protective sheath 6 arranged sequentially from distal to proximal.

[0031] The guide head 5 is specifically used to open the path and push the interventional imaging catheter in the blood vessel, which facilitates the overall entry of the interventional imaging catheter into the blood vessel.

[0032] The probe 4, as a functional component for detecting and imaging the internal condition of blood vessels, mainly performs imaging by rotating after the interventional imaging catheter is pushed into place, in conjunction with the signal processing device 3 and the transmission of optical or electrical signals.

[0033] The protective sheath 6 is specifically a hollow sheath structure used to house and protect the internal transmission and signal components.

[0034] By mounting the probe 4 between the guide head 5 and the protective sheath 6, and exposing the detection part of the probe 4 to the outside relative to the guide head 5 and the protective sheath 6, the obstruction of the detection part of the probe 4 by the traditional outer sheath can be reduced, the absorption, scattering or reflection of light or sound signals can be avoided, the signal attenuation can be avoided when passing through the outer sheath, the signal-to-noise ratio at the signal receiving end can be ensured, the clarity of the detection imaging can be improved, and the accuracy of lesion identification can be guaranteed.

[0035] The protective sheath 6 is equipped with an inner and outer stacked signal transmission tube 11 and a drive transmission tube 12. The signal transmission tube 11 and the drive transmission tube 12 are respectively connected to the probe 4. On the one hand, the protective sheath 6 can protect the signal transmission and transmission components, and on the other hand, the probe 4 can be rotated under the drive of the drive transmission tube 12.

[0036] Specifically, after the interventional imaging catheter is pushed into place inside the blood vessel, the drive transmission tube 12, through the cooperation of the rotation drive device 2 and the drive transmission tube 12, can rotate under the electromagnetic action of the rotation drive device 2 via electromagnetic coupling. This rotation drives the probe 4 to rotate relative to the statically stationary guide head 5 and protective sheath 6. During the rotation, the signal processing device 3 detects and images, thus constituting the core imaging process of the interventional imaging catheter. The drive transmission tube 12 and the signal processing device 3 transmit optical signals through a spatial optical coupling device and transmit electrical signals through coil induction.

[0037] In order to avoid the generation of guidewire artifacts in the prior art, the interventional imaging catheter in this application is provided with a support tube 7 for the guidewire to pass through the inside of the interventional imaging catheter. At the same time, by optimizing the relative position and connection relationship between the support tube 7 and different structures, the probe 4 is rotated relative to the static guide head 5 and the protective sheath 6. Furthermore, the support tube 7 provides relative support to the entire interior of the interventional imaging catheter, which is conducive to pushing and pulling the entire interventional imaging catheter.

[0038] Specifically, the distal end of the support tube 7 is located inside the guide head 5, and the support tube 7 passes through the probe 4 and the signal transmission tube 11 through a gap, and is led outward from the proximal end of the protective sheath 6 and the signal processing device 3.

[0039] Preferably, the distal end of the support tube 7 is connected to the inside of the guide head 5, so that the support tube 7 and the guide head 5 are connected as an integral structure. At the same time, after the support tube 7 passes through the probe 4 and the signal transmission tube 11 from the distal to the proximal end, it is fixedly connected to the end face of the protective sheath 6 at the proximal end and the signal processing device 3. Thus, the protective sheath 6, the signal processing device 3 and the guide head 5 are all connected to the support tube 7 located inside, which facilitates the overall pushing and pulling of the interventional imaging catheter.

[0040] By using the gap fit between the support tube 7 and the probe 4 and the signal transmission tube 11, the drive transmission tube 12 can rotate while simultaneously driving the probe 4 and the signal transmission tube 11 to rotate synchronously. At the same time, the guide head 5, the protective sheath 6, and the signal processing device 3 are kept relatively stationary. This reduces the mutual interference between the detection function components and the intervention insertion components while ensuring the normal function of the guide head 5 and the protective sheath 6.

[0041] In one specific embodiment, the probe 4 includes assembly portions 41 located at both ends of the axial direction and an exposed portion 42 located in the middle. The assembly portions 41 located at both ends are mainly used for assembling the probe 4 between the guide head 5 and the protective sheath 6. The assembly portions 41 are respectively fitted with the guide head 5 and the protective sheath 6 with a clearance fit and limit the locking, so that the probe 4 can rotate relative to the guide head 5 and the protective sheath 6.

[0042] It should be noted that, based on the fixed connection between the support tube 7 and the guide head 5, the protective sheath 6 and the signal processing device 3, the support tube 7 does not move in the overall axial direction of the interventional imaging catheter.

[0043] Furthermore, the distal ends of the drive transmission tube 12 and the signal transmission tube 11 are respectively connected to the probe 4. The lengths of the drive transmission tube 12 and the signal transmission tube 11 occupy the space near the proximal end of the probe 4 within the protective sheath 6, thus fixing the position of the probe 4 along the overall length of the interventional imaging catheter. By fitting the mounting portions 41 at both ends of the probe 4 with the guide head 5 and the protective sheath 6 in a clearance-limiting manner, axial swaying of the probe 4 during rotation of the interventional imaging catheter can be avoided, ensuring stable and reliable detection and imaging operations at the exposed portion 42, thereby improving the accuracy of detection and imaging. Furthermore, the probe 4 can move synchronously with the protective sheath 6 and the guide head 5 during the overall pushing and pulling process of the interventional imaging catheter.

[0044] The exposed portion 42 serves as the detection area of ​​the probe 4, isolated between the proximal end of the guide head 5 and the distal end of the protective sheath 6. This allows for the determination of the axial position of the detection area relative to the interventional imaging catheter. Furthermore, the exposed detection functional portion reduces signal loss and improves the clarity of the detection imaging.

[0045] In this application, the longitudinal cross-section of the probe 4 is H-shaped, and the exposed portion 42 has a radially concave structure relative to the assembly portion 41. By using the radially concave exposed portion 42 as the main part of the detection function, rotational abrasion damage to the detection position inside the blood vessel by the probe 4 during high-speed operation can be prevented.

[0046] From the angle at which the entire interventional imaging catheter is pushed and pulled, and the guidewire is inserted inside the interventional imaging catheter, the guide head 5 includes a pointed cone structure, and a tip guidewire hole 51 is provided at the distal tip of the guide head 5. The distal end of the support tube 7 is fixedly connected to the inside of the guide head 5, forming an integral connection between the support tube 7 and the guide head 5. Combined with the fixed connection between the support tube 7 and the protective sheath 6 and the signal processing device 3, the guide head 5, the protective sheath 6, the signal processing device 3 and the support tube 7 can form a push-pull integral unit.

[0047] In the specific operation process, the entire interventional imaging catheter can be pushed and pulled back and forth by controlling the pushing and pulling action of the protective sheath 6 and the signal processing device 3 at the proximal end of the catheter.

[0048] The support tube 7 is specifically a hollow tube with a continuous structure, including a straight guidewire channel 71 located inside. By connecting the distal end of the guidewire channel 71 with the tip guidewire hole 51, and combining the support tube 7 through the gap in the radial interior of the probe 4, the guidewire can be passed through the radial interior of the probe 4. Compared with existing traditional interventional imaging catheters, it can avoid the guidewire blocking part of the detection signal on the side of the probe 4 after it is inserted, truly achieving artifact-free detection and making the detection position information inside the blood vessel more complete.

[0049] The support tube 7 in this application is located at the center of the catheter body 1 and is penetrated by the entire internal center of the probe 4. On the one hand, it can support the guide head 5 and the protective sheath 6, and on the other hand, it can achieve the technical purpose of the guide wire being penetrated radially inside the probe 4.

[0050] In clinical practice, the guidewire is guided through the central guidewire channel 71 of the support tube 7. The guidewire is located on the rotation axis of the probe 4. When the probe 4 rotates and scans, the guidewire remains within the radially inner center of the detection field of view (blind zone) and does not appear on the scanning path. Therefore, the guidewire does not obstruct the signal emitted by the probe 4 at all, fundamentally solving the guidewire artifact problem caused by guidewire position offset in traditional catheters, resulting in more complete and accurate diagnostic information regarding the detection position.

[0051] The support tube 7 serves as the skeleton structure of the entire interventional imaging catheter and is made of metal or polymer materials (such as stainless steel braided tube or polyetheretherketone tube) with high torsional strength and good flexibility.

[0052] The probe 4 and signal transmission tube 11 are respectively fitted with the support tube 7 with clearance, allowing the probe 4 and signal transmission tube 11 to rotate freely relative to the support tube 7. The proximal part of the protective sheath 6 and the signal processing device 3 are fixedly connected to the support tube 7, providing stable structural support for the entire interventional imaging catheter.

[0053] Based on the specific composition of the probe 4 and its cooperation with the guide head 5 and the protective sheath 6, the assembly part 41 includes a proximal assembly part 411 and a distal assembly part 412. The proximal assembly part 411 and the distal assembly part 412 each include a limiting step 413, which is disposed opposite to each other on both sides of the exposed part 42.

[0054] Furthermore, the near-end assembly portion 411, the exposed portion 42, and the far-end assembly portion 412 are concentrically arranged, and the exposed portion 42 has a radially concave structure relative to the assembly portion 41, which enables the edge diameter of the limiting step 413 to be larger than the edge diameter of the exposed portion 42.

[0055] The proximal gap of the guide head 5 covers the outside of the distal assembly portion 412 and abuts against the corresponding limiting step 413. At the same time, the distal gap of the protective sheath 6 covers the outside of the proximal assembly portion 411 and abuts against its corresponding limiting step 413.

[0056] With the above-described assembly method, the exposed portion 42 of the probe 4 can be suspended in the isolation space between the proximal end of the guide head 5 and the distal end of the protective sheath 6. This allows the exposed portion 42 to be directly exposed to the blood or other vascular structures within the blood vessel, without needing to penetrate any additional outer sheath material, thus avoiding signal attenuation.

[0057] In order to enable the drive transmission tube 12 to drive the probe 4 to rotate relative to the protective sheath 6, the drive transmission tube 12 and the protective sheath 6 are fitted with a clearance, and the proximal part of the protective sheath 6 is fixedly housed in the drive groove 21 of the rotary drive device 2.

[0058] The rotary drive device 2 in this application specifically adopts an electromagnetic coupling drive. Electromagnetic coupling drive utilizes the alternating changes in the electromagnetic field to transmit output torque in different directions of rotation, causing the drive transmission tube 12 to rotate without physical contact. In a specific configuration, a stator coil can be placed in the drive slot 21, and a permanent magnet or magnetic induction element can be placed on the drive transmission tube 12 near the inner side of the protective sheath 6. By passing different types of current through the stator coil, the forward and reverse rotation of the drive transmission tube 12 can be achieved.

[0059] When the rotary drive device 2 is powered on, the rotating magnetic field it generates passes through the wall of the protective sheath 6 and acts directly on the permanent magnet or magnetic induction element on the drive transmission tube 12, causing the drive transmission tube 12 to rotate at high speed through non-contact electromagnetic coupling. The drive transmission tube 12 then drives the probe 4 to rotate synchronously, achieving high frame rate imaging.

[0060] Compared to traditional mechanical contact drives, contactless electromagnetic coupling drives completely eliminate friction and mechanical gaps between transmission components, greatly reducing vibration and noise during the drive process. This makes probe 4 run more smoothly at high speeds, with higher position and angle accuracy, effectively avoiding imaging geometric distortion or stripe artifacts caused by mechanical vibration, ensuring imaging stability and measurement repeatability, and achieving high frame rate imaging.

[0061] This application also provides an imaging system, including a reciprocating drive device, an imaging terminal, and the interventional imaging catheter described above. The reciprocating drive device can be a catheter surgery robot, which provides reciprocating driving force to the interventional imaging catheter to control the interventional imaging catheter to perform stable pushing and pulling movements in the blood vessel.

[0062] When the interventional imaging catheter is pushed or pulled into place or scanning is performed, the signal processing device 3 establishes a communication link with the probe 4 of the interventional imaging catheter through fiber optic / electrical connection coupling, transmits photoelectric signals, and combines with the external imaging terminal to complete real-time, high-definition, artifact-free detection and imaging of the internal state of the blood vessel.

[0063] The interventional imaging catheter in this application is mainly used to protect the structural components of the catheter body 1. For technical contents such as contactless driving and photoelectric coupling signal transmission, please refer to the relevant prior art disclosed by the applicant, including but not limited to the technical contents disclosed in publication numbers CN120837021A and CN117559749A, which will not be specifically explained here.

[0064] The interventional imaging catheter and imaging system described in this application can solve the problem of attenuation of light or sound signals emitted by the probe 4 by the existing catheter sheath, thereby improving signal strength and making the imaging image clearer.

[0065] The guidewire is located at the center of the entire interventional imaging catheter, ensuring no obstruction of the probe 4 signal and solving the problem of guidewire artifacts in existing catheter imaging, thereby obtaining more complete detection data.

[0066] The rotary drive device 2 drives the probe 4 at high speed through the drive transmission tube 12 in the form of electromagnetic coupling. The torque transmission is non-contact, which reduces the vibration and noise caused by the drive to a greater extent, making the operation of the probe 4 and the imaging quality more stable.

[0067] The signal processing device 3 can transmit optical and electrical signals through coupling, further simplifying the interface structure. Combined with electromagnetic coupling drive, the overall structure can be made more compact.

[0068] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An interventional imaging catheter, characterized in that, include: The catheter body, the rotary drive device, and the signal processing device; The catheter body includes a guide head, a probe, and a protective sheath arranged sequentially from distal to proximal. The probe is mounted between the guide head and the protective sheath, and the detection part of the probe is exposed to the outside relative to the guide head and the protective sheath. The protective sheath is internally provided with an inner and outer stacked signal transmission tube and a drive transmission tube, which are respectively connected to the probe. The drive transmission tube rotates under the electromagnetic action of the rotary drive device through electromagnetic coupling, thereby driving the probe to rotate relative to the guide head and the protective sheath, and combining the signal processing device to detect and image during the rotation process; And a support tube for guiding the guidewire through, the distal end of the support tube being disposed inside the guide head, and the support tube passing through the probe and the signal transmission tube, and then extending outward from the proximal end of the protective sheath and the signal processing device; The probe includes mounting portions at both ends along the axial direction and an exposed portion in the middle. The mounting portions at both ends are respectively fitted with the guide head and the protective sheath with a clearance fit and limit the locking, so that the probe can rotate relative to the guide head and the protective sheath. The exposed portion serves as the probe's detection area, isolated between the proximal end of the guide head and the distal end of the protective sheath. The probe has an H-shaped longitudinal cross-section, and the exposed portion has a radially concave structure relative to the assembly portion.

2. The interventional imaging catheter according to claim 1, characterized in that, The guide head includes a pointed cone-shaped structure, and a tip guide wire hole is provided at the distal tip of the guide head; The distal end of the support tube is fixedly connected to the inside of the guide head; The support tube includes a straight-through guide wire cavity, the distal end of which is directly connected to the tip guide wire hole.

3. The interventional imaging catheter according to claim 1, characterized in that, The support tube is located at the very center of the catheter body and is entirely penetrated by the internal center of the probe.

4. The interventional imaging catheter according to claim 1, characterized in that, The probe and the signal transmission tube are respectively fitted with the support tube with a clearance, and the proximal end of the protective sheath and the signal processing device are both fixedly connected to the support tube.

5. The interventional imaging catheter according to claim 1, characterized in that, The assembly part includes a proximal assembly part and a distal assembly part, and the proximal assembly part and the distal assembly part each include a limiting step, which is disposed opposite to each other on both sides of the exposed part.

6. The interventional imaging catheter according to claim 5, characterized in that, The proximal gap of the guide head covers the outside of the distal assembly, and the distal gap of the protective sheath covers the outside of the proximal assembly.

7. The interventional imaging catheter according to claim 1, characterized in that, The drive transmission tube is clearance-fitted with the protective sheath, and the proximal portion of the protective sheath is fixedly housed in the drive groove of the rotary drive device.

8. An imaging system, characterized in that, The device includes a reciprocating drive device, an imaging terminal, and an interventional imaging catheter according to any one of claims 1-7, wherein the reciprocating drive device is used for push-pull control of the interventional imaging catheter; After the interventional imaging catheter is pushed or pulled into place, the signal processing device is used to transmit photoelectric signals to the probe through coupling, and to perform detection and imaging in conjunction with the imaging terminal.

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