Microcatheter and catheter system

Abstract

A main body tube is provided with an axially through catheter inner cavity, an optical fiber body comprises at least one optical fiber core, the optical fiber body is arranged in the axial direction of the main body tube, the optical fiber body is used for generating image data after shape demodulation, and the image data is configured to be readable in an image display device. According to the microcatheter and the catheter system, the microcatheter is combined with the inventive concept that the optical fiber technology is used for navigation and positioning, the optical fiber is added into the microcatheter to achieve the more accurate positioning function, the optical fiber is used for sensing the position distribution of the microcatheter in the three-dimensional space, a three-dimensional image is formed, and the view field is widened. Therefore, the problem of sight blocking in the operation can be effectively solved, and clinicians can judge and operate conveniently. The application of the optical fiber technology in the micro-catheter can solve the technical problems that the existing clinical radiation medical imaging technology is large in radiation damage, and the two-dimensional imaging is not favorable for judging the position of the catheter.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a microcatheter and a catheter system. Background Art

[0002] Percutaneous coronary intervention (PCI) is mainly used to treat obstructive coronary artery disease. PCI has developed rapidly due to its advantages such as minimally invasive, time-saving, safe and efficient. It has a high surgical success rate and good treatment effect for left main lesions, chronic total occlusion (CTO) lesions, severe calcified lesions, etc. As a tool suitable for coronary vessels, especially for opening chronic total occlusion lesions, the positioning performance of the microcatheter in the blood vessel is crucial. Only by clearly knowing the position of the microcatheter can the microcatheter be better pushed to help the guidewire pass through the stenotic lesion.

[0003] With the advancement of percutaneous coronary intervention, percutaneous coronary intervention can be used to diagnose and treat more distal vascular areas, which also requires smaller and more precise equipment components than before. The current conventional method is to locate the microcatheter through radiological medical imaging technology, which requires many equipment components to be visible under X-ray fluoroscopy to ensure correct placement and navigation during surgery. The plastic used to make microcatheters is essentially transparent under X-rays, and radiopaque fillers must be mixed into the base polymer to provide the necessary visibility or radiopaqueness. However, this technology relies on medical imaging technology and causes great radiation damage to clinicians. When the radiation dose accumulates to a certain level, it may cause pathological changes in the human body, such as skin damage and lens damage. In addition, the medical images output by this technology are often two-dimensional images with limited field of view. Once various guidewires, catheters, instruments, etc. are present, it is easy to cause line of sight obstruction, and the position of the microcatheter in the blood vessel cannot be well judged, and the navigation accuracy is low. Summary of the invention

[0004] Based on this, it is necessary to provide a microcatheter and a catheter system to address at least one of the technical problems mentioned above.

[0005] The present application provides a microcatheter, the microcatheter comprising:

[0006] A main body tube, wherein the main body tube has an axially penetrating catheter lumen;

[0007] An optical fiber body, the optical fiber body comprising at least one optical fiber core, the optical fiber body being arranged along the axial direction of the main body tube, the optical fiber body being used to generate image data after shape demodulation, the image data being configured to generate an image displayable in an image display device after data processing;

[0008] The optical fiber body is embedded in the interior of the tube wall of the main tube along the axial direction of the main tube, and the main tube includes an inner tube layer, an intermediate tube layer and an outer tube layer which are sequentially mounted, wherein an axially extending optical fiber receiving channel is opened inside the tube wall of at least one of the inner tube layer, the intermediate tube layer and the outer tube layer, and the optical fiber receiving channel is used to pass the optical fiber body; or, at least one of the inner tube layer, the intermediate tube layer and the outer tube layer is a braided structure, and the optical fiber body is braided in the braided structure.

[0009] In one embodiment, the optical fiber body comprises a plurality of optical fiber cores, and the plurality of optical fiber cores are divided into a central fiber core and a plurality of other peripheral fiber cores. The central fiber core extends along the axial direction of the main body tube, and the plurality of other peripheral fiber cores are all surrounding the periphery of the central fiber core.

[0010] In one embodiment, a plurality of optical fiber cores are arranged parallel to each other along the axial direction of the main tube.

[0011] In one embodiment, the plurality of optical fiber cores are arranged non-parallel to each other along the axial direction of the main tube.

[0012] In one embodiment, the remaining plurality of peripheral fiber cores are spirally coiled around the periphery of the central fiber core along the axial direction of the main tube.

[0013] In one embodiment, the inner tube layer has an axially penetrating inner tube lumen, the middle tube layer has an axially penetrating middle tube lumen, the middle tube layer is fixedly sleeved on the outside of the inner tube layer through the middle tube lumen, and the outer tube layer has an axially penetrating outer tube lumen, the outer tube layer is fixedly sleeved on the outside of the middle tube layer through the outer tube lumen.

[0014] In one embodiment, the material of the outer tube layer is a polymer material; and / or,

[0015] The material of the intermediate tube layer is a metal material; and / or,

[0016] The material of the inner tube layer is a low-friction material; and / or,

[0017] The optical fiber body is made of silicon dioxide; and / or,

[0018] A guide component is provided at the distal end of the main body tube; and / or,

[0019] The main body tube is provided with a developing component.

[0020] In one embodiment, the material of the outer tube layer is nylon, block polyetheramide resin or thermoplastic polyurethane elastomer; and / or,

[0021] The material of the intermediate pipe layer is stainless steel; and / or,

[0022] The material of the inner tube layer is polytetrafluoroethylene or high-density polyethylene.

[0023] The present application provides a catheter system, the catheter system comprising:

[0024] the microcatheter;

[0025] A signal demodulator is connected to the optical fiber body in the microcatheter and is used to demodulate the shape of the optical fiber body to generate image data. The image data is used to generate an image that can be displayed in an image display device after data processing.

[0026] In the above-mentioned microcatheter and catheter system, the microcatheter combines the invention concept of using optical fiber technology for navigation and positioning, adds optical fiber to the microcatheter to achieve a more accurate positioning function, and uses optical fiber to sense the position distribution of the microcatheter in three-dimensional space to form a three-dimensional image and broaden the field of view. This can effectively solve the problem of intraoperative line of sight obstruction and facilitate clinicians' judgment and operation. The application of this optical fiber technology in microcatheters can solve the technical problems that the radiation damage of current clinical radiological medical imaging technology is large and its two-dimensional imaging is not conducive to judging the position of the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a schematic diagram of the working state of a microcatheter used in the prior art.

[0028] FIG. 2 is an image of the microcatheter shown in FIG. 1 obtained by using radiological medical imaging technology.

[0029] FIG3 is a schematic diagram of the structure of a microcatheter provided in one embodiment of the present application.

[0030] FIG. 4 is a schematic diagram of the working state of a microcatheter provided in one embodiment of the present application.

[0031] FIG. 5 is a schematic diagram of the tube layer structure of a main tube provided in one embodiment of the present application.

[0032] FIG. 6 is a schematic diagram of a braided structure provided in one embodiment of the present application.

[0033] FIG. 7 is a distribution diagram of multiple optical fiber cores of an optical fiber body provided in one embodiment of the present application.

[0034] FIG. 8 is a distribution diagram of the AA radial cross-section of the plurality of optical fiber cores shown in FIG. 7 .

[0035] FIG. 9 is a diagram showing the tensile region and the compressive region of an optical fiber body provided by one embodiment of the present application.

[0036] Figure Number:

[0037] 10. Target blood vessel; 20. Target lesion;

[0038] 100. Signal demodulator; 200. Image display device;

[0039] 1000, main body tube; 2000, optical fiber body;

[0040] 1000a, guide component; 1000b, developing component; 1000c, guide wire; 1000d, sheath; 1000e, connecting member;

[0041] 1100, inner tube layer; 1200, middle tube layer; 1300, outer tube layer;

[0042] 1200a, braided structure; 1300a, optical fiber receiving channel;

[0043] 2000a, optical fiber core; 2000a1, tensile region; 2000a2, compression region. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] As shown in FIG1 , in conventional percutaneous coronary intervention, the microcatheter can pass through the tortuous target blood vessel 10 and the narrow target lesion 20 in the target blood vessel 10 through the guidance of the guide wire 1000c. During the advancement process, the microcatheter's own position is mainly displayed by the developing element such as the developing ring at the distal end of the microcatheter. Therefore, the positioning accuracy of conventional microcatheters is poor, and multiple X-ray confirmations are required in one operation. Repeated use of X-rays will cause cumulative radiation doses, which may cause pathological changes in doctors over time, such as skin damage and lens damage, causing heavy burdens. Moreover, as shown in FIG2 , the two-dimensional imaging accuracy generated by X-rays is actually not high. Once there are various guide wires, catheters, instruments, etc., it is easy to cause line of sight obstruction, and it is impossible to judge the position of the microcatheter in the blood vessel well.

[0051] In view of the above technical defects, an embodiment of the present application provides a microcatheter. The microcatheter adopts the inventive concept of using optical fiber technology for navigation and positioning, adding optical fiber to the microcatheter to achieve a more accurate positioning function, and using optical fiber to sense the position distribution of the microcatheter in three-dimensional space to form a three-dimensional image, broaden the field of view, effectively solve the problem of intraoperative line of sight obstruction, and facilitate clinical doctors' judgment and operation. The application of this optical fiber technology in the microcatheter can solve the technical problems that the radiation damage of current clinical radiological medical imaging technology is large and its two-dimensional imaging is not conducive to judging the position of the catheter.

[0052] Referring to FIG. 3 and FIG. 4 , the microcatheter provided by the present application includes a main body tube 1000 and an optical fiber body 2000, wherein the optical fiber body 2000 is arranged in the main body tube 1000 along the axial direction of the main body tube 1000, wherein the number of the optical fiber body 2000 may be one or more, and may be added according to actual needs, such as 1, 2 or 3. The main body tube 1000, as the main structure of the microcatheter, may be composed of conventional tube types and materials, or may be constructed into a specific design form according to the assembly and layout requirements of the optical fiber body 2000, and may adopt an adapted material. Those skilled in the art may set it according to actual needs, which is not limited here. The main body tube 1000 has an axially through-going catheter lumen, which may be used to penetrate a guide wire 1000c, so that the microcatheter may use the guidance of the guide wire 1000c to pass through, for example, the tortuous target blood vessel 10 shown in FIG. 1 and the narrow target lesion 20 in the target blood vessel 10, etc., which is not limited here.

[0053] The optical fiber body 2000 may include at least one optical fiber core 2000a, for example, the optical fiber body 2000 includes only one optical fiber core 2000a or includes two or more optical fiber cores 2000a at the same time. In one embodiment, when the optical fiber body 2000 includes two or more optical fiber cores 2000a at the same time, the number of optical fiber cores 2000a included in the optical fiber body 2000 may be limited to between 4 and 7, for example, the optical fiber body 2000 includes 4, 5, 6 or 7 optical fiber cores 2000a. The optical fiber body 2000 may be arranged in the main body tube 1000 along the axial direction of the main body tube 1000, and the shape and structure of the main body tube 1000 are simulated by arranging the optical fiber body 2000 along the axial direction of the main body tube 1000.

[0054] The optical fiber body 2000 can generate image data after shape demodulation. The image data can be processed by an image processor to generate an image that can be directly observed, which can be called a "contrast image" or a "medical image". The image display device 200 is used to display the image. Therefore, the image display device 200 can generate and display an image by processing the image data, and display the "contrast image" in the image display device 200. The "contrast image" represents the image morphology of the optical fiber body 2000. However, since the optical fiber body 2000 simulates the axial morphology of the main tube 1000 along the axial direction of the main tube 1000, the "contrast image" can actually indirectly express the image morphology of the main tube 1000, that is, express the image morphology of the microcatheter.

[0055] The shape demodulation principle of the optical fiber body 2000 is that when the optical fiber body 2000 is deformed in the target blood vessel 10 along with the main tube 1000, the strain of the optical fiber core 2000a contained in the optical fiber body 2000 will change accordingly. Therefore, by accumulating and reconstructing the local coordinate information (signal) output by the optical fiber core 2000a, and then inputting the local coordinate information (signal) into the signal demodulator 100 for shape demodulation, image data can be generated. The image data can be interpreted by the image display device 200, and finally the "contrast image" is output in the image display device 200, showing the image morphology of the optical fiber body 2000, thereby realizing the visualization of the three-dimensional shape of the microcatheter.

[0056] Based on the above shape demodulation principle, the layout and structure of the optical fiber body 2000 in the main tube 1000 will affect the quality of the final "contrast image" output, which can also be understood as the accuracy of the three-dimensional shape expression of the microcatheter. This application will introduce the specific layout and structure of the optical fiber body 2000 in the main tube 1000 in detail.

[0057] The main purpose of the optical fiber body 2000 is to simulate the shape and structure of the main body tube 1000 along the axial direction of the main body tube 1000, so that when the main body tube 1000 bends in the target blood vessel 10, the optical fiber body 2000 can also bend accordingly, thereby expressing the real shape of the main body tube 1000 by means of the shape change of the optical fiber body 2000. Therefore, the optical fiber body 2000 can be embedded in the main body tube 1000 in a variety of ways. For example, the optical fiber body 2000 can be embedded in the inner wall, outer wall of the main body tube 1000, or embedded in the tube wall between the inner wall and the outer wall along the axial direction of the main body tube 1000.

[0058] When the optical fiber body 2000 is embedded in the inner wall or outer wall of the main tube 1000 along the axial direction of the main tube 1000, a linear groove structure for accommodating the optical fiber body 2000 can be opened on the inner wall or outer wall of the main tube 1000, so that the optical fiber body 2000 can be fitted and embedded in the corresponding linear groove structure, and the optical fiber body 2000 and the main tube 1000 are fixed intact by bonding, suturing, etc., to ensure that the optical fiber body 2000 will not fall off when the main tube 1000 is bent, but will deform adaptively with the main tube 1000.

[0059] Alternatively, when the optical fiber body 2000 is embedded in the tube wall between the inner wall and the outer wall of the main tube 1000 along the axial direction of the main tube 1000, a corresponding through channel can be opened in the tube wall of the main tube 1000, so that the optical fiber body 2000 can be embedded in the through channel opened in the tube wall along the axial direction of the main tube 1000, and then the optical fiber body 2000 and the main tube 1000 can be fixed intact by bonding, sewing or the like, to ensure that the optical fiber body 2000 will not fall off when the main tube 1000 is bent, but will deform adaptively with the main tube 1000.

[0060] Referring to FIG. 5 , in one embodiment, the main tube 1000 may include an inner tube layer 1100, an intermediate tube layer 1200, and an outer tube layer 1300 which are sequentially mounted, the inner tube layer 1100 having an inner tube lumen which is axially penetrated, the intermediate tube layer 1200 having an inner tube lumen which is axially penetrated, the intermediate tube layer 1200 being fixedly mounted on the outside of the inner tube layer 1100 through the inner tube lumen, wherein the intermediate tube layer 1200 and the inner tube layer 1100 may be fixed to each other by means of methods such as thermal melting of polymer materials, the outer tube layer 1300 having an outer tube lumen which is axially penetrated, the outer tube layer 1300 being fixedly mounted on the outside of the intermediate tube layer 1200 through the outer tube lumen, wherein the outer tube layer 1300 and the intermediate tube layer 1200 may also be fixed to each other by means of methods such as thermal melting of polymer materials.

[0061] An axially extending optical fiber receiving channel 1300a is provided inside the tube wall of at least one of the inner tube layer 1100, the middle tube layer 1200 and the outer tube layer 1300, and the optical fiber receiving channel 1300a is used to pass the optical fiber body 2000. Therefore, the optical fiber body 2000 can be arranged in the inner tube layer 1100, the middle tube layer 1200 or the outer tube layer 1300 according to design requirements in the main tube 1000 having the inner tube layer 1100, the middle tube layer 1200 and the outer tube layer 1300. Alternatively, at least one of the inner tube layer 1100, the middle tube layer 1200 and the outer tube layer 1300 is a braided structure 1200a, therefore, when the inner tube layer 1100, the middle tube layer 1200 and the outer tube layer 1300 of the main tube 1000 are constructed by braiding, the optical fiber body 2000 can be braided in the braided structure 1200a. Furthermore, shape memory alloy may be added to the braided structure 1200a to enhance the shape memory function of the braided structure 1200a.

[0062] Referring to FIG. 5 , in one embodiment, a fiber receiving channel 1300a may be provided inside the tube wall of the outer tube layer 1300, and the optical fiber body 2000 is inserted into the optical fiber receiving channel 1300a of the outer tube layer 1300. Alternatively, the middle tube layer 1200 is a braided structure 1200a, and the optical fiber body 2000 is braided inside the middle tube layer 1200. In addition, those skilled in the art may also arrange the optical fiber body 2000 in other configurations, which are not limited here.

[0063] The material of the outer tube layer 1300 can be a polymer material, such as nylon, block polyether amide resin and thermoplastic polyurethane elastomer. The material of the middle tube layer 1200 can be a metal material, such as stainless steel, such as 304 stainless steel. The material of the inner tube layer 1100 can be a low-friction material, such as polytetrafluoroethylene and high-density polyethylene. The material of the optical fiber body 2000 can be silicon dioxide.

[0064] In addition, those skilled in the art may also use other methods to embed the optical fiber body 2000 into the main tube 1000 along the axial direction of the main tube 1000, and simulate the shape and structure of the main tube 1000 through the optical fiber body 2000, which is not limited here.

[0065] A guide component 1000a may be provided at the distal end of the main tube 1000, and the guide component 1000a may have a tapered structure that is easy to guide the main tube 1000 to advance in the target blood vessel 10. A developing component 1000b, such as a developing ring, may also be provided on the main tube 1000. A sheath 1000d and a connector 1000e may also be provided at the proximal end of the main tube 1000 to facilitate connection with the signal demodulator 100.

[0066] In one embodiment, when the optical fiber body 2000 includes a plurality of optical fiber cores 2000a, the plurality of optical fiber cores 2000a may be arranged parallel to each other along the axial direction of the main tube 1000, or the plurality of optical fiber cores 2000a may also be arranged non-parallel to each other along the axial direction of the main tube 1000. The plurality of optical fiber cores 2000a are arranged parallel to each other along the axial direction of the main tube 1000, which includes both absolute parallelism of the plurality of optical fiber cores 2000a relative to the central axis of the main tube 1000 and slight angle deviation. The plurality of optical fiber cores 2000a may also be arranged non-parallel to each other along the axial direction of the main tube 1000, which is mainly manifested in that the plurality of optical fiber cores 2000a are obviously bent or entangled relative to the central axis of the main tube 1000, so that the plurality of optical fiber cores 2000a in the optical fiber body 2000 mainly extend along the direction of the central axis of the main tube 1000, but each optical fiber core 2000a has its own bending shape.

[0067] Referring to FIGS. 7 to 9, in one embodiment, the multiple optical fiber cores 2000a included in the optical fiber body 2000 can be divided into a central fiber core and the remaining multiple peripheral fiber cores, wherein the number of the central fiber cores can be one or more, and the remaining optical fiber cores 2000a are called peripheral fiber cores. It should be noted that the central fiber core and the remaining multiple peripheral fiber cores named respectively are all optical fiber cores 2000a included in the optical fiber body 2000, and are named only for the convenience of comparing the distribution shown in FIGS. 7 to 9. There is no difference between the central fiber core and the remaining multiple peripheral fiber cores. Referring to FIGS. 7 and 8, a central fiber core can extend along the axial direction of the main body tube 1000, and the remaining multiple peripheral fiber cores in the optical fiber body 2000 except the central fiber core are all surrounded by the periphery of the central fiber core, so that the central fiber core and the remaining multiple peripheral fiber cores are distributed in three-dimensional space in the main body tube 1000.

[0068] For example, referring to the distribution methods in FIG. 7 to FIG. 9 , in one embodiment, the remaining multiple peripheral fiber cores may be spirally wound around a central fiber core along the axial direction of the main tube 1000. In addition, those skilled in the art may also distribute the remaining multiple peripheral fiber cores around a central fiber core in other surrounding methods according to actual needs, which may include distributing the remaining multiple peripheral fiber cores around a central fiber core in a regular spiral surrounding method, for example, as described above, or distributing the remaining multiple peripheral fiber cores around a central fiber core in other irregular surrounding methods, which is not limited here.

[0069] Referring to FIG9 , taking the case where the remaining multiple peripheral fiber cores are distributed around a central fiber core in a spiral manner as an example, when the main tube 1000 is bent, the multiple fiber cores 2000a (including a central fiber core and multiple peripheral fiber cores) in the optical fiber body 2000 will also be deformed accordingly. For example, when the main tube 1000 and the optical fiber body 2000 are bent at the same time as shown in FIG9 , the multiple fiber cores 2000a contained in the optical fiber body 2000 will also bend in the same direction in an adaptive manner, and at this time, a central fiber core will have a bent shape, while the multiple peripheral fiber cores around a central fiber core will show more obvious differences on the outer side and inner side of the bending of the optical fiber body 2000. The outer side of the bending of the optical fiber body 2000 will be stretched, showing an obvious stretching area 2000a1, and the inner side of the bending of the optical fiber body 2000 will be compressed, showing an obvious compression area 2000a2. Therefore, when the optical fiber body 2000 is deformed along with the main tube 1000, the strain of each optical fiber core 2000a in the optical fiber body 2000 may be different, which is manifested as the change of the local coordinate information (signal) of each optical fiber core 2000a. After cumulative reconstruction, the local coordinate information (signal) is input into the signal demodulator 100 for shape demodulation, and image data can be generated. The image data can be interpreted by the image display device 200, and finally the "contrast image" is output in the image display device 200, showing the image morphology of the optical fiber body 2000, thereby realizing the visualization of the three-dimensional shape of the microcatheter.

[0070] The present application provides a catheter system, which includes a microcatheter and a signal demodulator 100. The signal demodulator 100 is connected to the optical fiber body 2000 in the microcatheter for data demodulation of the shape of the optical fiber body 2000 to generate image data, and the image data is used to generate an image that can be displayed in the image display device 200 after data processing. When the optical fiber body 2000 is deformed in the target blood vessel 10 along with the main tube 1000, the strain of the optical fiber core 2000a contained in the optical fiber body 2000 will change accordingly. Therefore, by accumulating and reconstructing the local coordinate information (signal) output by the optical fiber core 2000a, and then inputting the local coordinate information (signal) into the signal demodulator 100 for shape demodulation, image data can be generated. The image data can be interpreted by the image display device 200, and finally the "contrast image" is output in the image display device 200, showing the image morphology of the optical fiber body 2000, thereby realizing the visualization of the three-dimensional shape of the microcatheter. Since the specific structure, functional principle and technical effect of the microcatheter are described in detail in the previous article, they will not be repeated here. Any technical content related to the microcatheter can refer to the previous record.

[0071] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A microcatheter, characterized in that: The microcatheter comprises: A main body tube, wherein the main body tube has an axially penetrating catheter lumen; An optical fiber body, the optical fiber body comprising at least one optical fiber core, the optical fiber body being arranged along the axial direction of the main body tube, the optical fiber body being used to generate image data after shape demodulation, the image data being configured to generate an image displayable in an image display device after data processing; The optical fiber body is embedded in the interior of the tube wall of the main tube along the axial direction of the main tube, and the main tube includes an inner tube layer, an intermediate tube layer and an outer tube layer which are sequentially mounted, wherein an axially extending optical fiber receiving channel is opened inside the tube wall of at least one of the inner tube layer, the intermediate tube layer and the outer tube layer, and the optical fiber receiving channel is used to pass the optical fiber body; or, at least one of the inner tube layer, the intermediate tube layer and the outer tube layer is a braided structure, and the optical fiber body is braided in the braided structure.

2. The microcatheter according to claim 1, characterized in that: The optical fiber body comprises a plurality of optical fiber cores, which are divided into a central fiber core and a plurality of other peripheral fiber cores. The central fiber core extends along the axial direction of the main body tube, and the plurality of other peripheral fiber cores surround the periphery of the central fiber core.

3. The microcatheter according to claim 2, characterized in that: The plurality of optical fiber cores are arranged parallel to each other along the axial direction of the main body tube.

4. The microcatheter according to claim 2, characterized in that: The plurality of optical fiber cores are arranged non-parallel to each other along the axial direction of the main tube.

5. The microcatheter according to claim 4, characterized in that: The remaining plurality of peripheral fiber cores are spirally coiled around the periphery of the central fiber core along the axial direction of the main tube.

6. The microcatheter according to claim 1, characterized in that: The inner tube layer has an inner tube lumen that runs axially through, the middle tube layer has a middle tube lumen that runs axially through, the middle tube layer is fixedly sleeved on the outside of the inner tube layer through the middle tube lumen, the outer tube layer has an outer tube lumen that runs axially through, the outer tube layer is fixedly sleeved on the outside of the middle tube layer through the outer tube lumen.

7. The microcatheter according to claim 6, characterized in that: The material of the outer tube layer is a polymer material; and / or, The material of the intermediate tube layer is a metal material; and / or, The material of the inner tube layer is a low-friction material; and / or, The optical fiber body is made of silicon dioxide; and / or, A guide component is provided at the distal end of the main body tube; and / or, The main body tube is provided with a developing component.

8. The microcatheter according to claim 7, characterized in that: The material of the outer tube layer is nylon, block polyetheramide resin or thermoplastic polyurethane elastomer; and / or, The material of the intermediate pipe layer is stainless steel; and / or, The material of the inner tube layer is polytetrafluoroethylene or high-density polyethylene.

9. A catheter system, characterized in that: The catheter system comprises: The microcatheter according to any one of claims 1 to 8; A signal demodulator is connected to the optical fiber body in the microcatheter and is used to demodulate the shape of the optical fiber body to generate image data. The image data is used to generate an image that can be displayed in an image display device after data processing.

Images