Microguidewires and minimally invasive interventional devices

Abstract

The present application relates to a micro-guidewire and a minimally invasive interventional device. The micro-guidewire includes a functional core and a covering layer; the functional core extends along a first direction, the functional core has a first end, the covering layer covers the outer peripheral surface of the functional core except the first end, and the first end can enter the lesion area; the functional core includes an inner core and a functional layer, the functional layer covers the outer peripheral surface of the inner core, and the functional layer includes a plurality of connected wires, at least a portion of which can be used to transmit signals and / or electrical energy. The present application can enrich the functions of the micro-guidewire, simplify the overall structure of the minimally invasive interventional device, and thus reduce the difficulty of operation for medical personnel.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a micro-guidewire and a minimally invasive interventional device. Background Art

[0002] Minimally invasive interventional technology has gradually developed into one of the three major diagnostic and treatment technologies alongside internal medicine and surgery. When using minimally invasive interventional technology for diagnosis and treatment, it is usually necessary to use minimally invasive interventional devices to deliver drugs or micro-devices into the patient's lesion area, so as to achieve the purpose of precise treatment.

[0003] Existing minimally invasive interventional devices mainly include micro-guidewires and micro-catheters, through which drugs or micro-devices are delivered to the patient's lesion area. Existing micro-guidewires only have a guiding function, and their terminal end positioning needs to be completed with the help of angiography equipment, and more sensors cannot be integrated on the micro-guidewire, which to a certain extent limits the level of intelligence in vascular interventional surgery and places high technical and experience requirements on medical personnel. In order to enrich the functions of micro-guidewires on the basis of the guiding function, so that their ends have the potential to integrate various sensors and actuators (including cameras, force sensors, ultrasonic generators, etc.), it is necessary to innovate the structure of the micro-guidewires and increase the anti-interference signal transmission and power supply functions without increasing the diameter of the micro-guidewires. Summary of the invention

[0004] The present application provides a micro-guidewire and a minimally invasive interventional device, aiming to enrich the functions of the micro-guidewire, simplify the overall structure of the minimally invasive interventional device, and reduce the difficulty of operation for medical personnel.

[0005] In a first aspect, the present application provides a micro guidewire, comprising a functional core and a covering layer;

[0006] The functional core extends along a first direction, the functional core has a first end, the covering layer covers the outer peripheral surface of the functional core except the first end, and the first end can enter the lesion area;

[0007] The functional core includes an inner core and a functional layer, wherein the functional layer covers the outer peripheral surface of the inner core, and the functional layer includes a plurality of connected wires, at least a portion of which can transmit signals and / or electrical energy.

[0008] In some embodiments, each of the wire bodies is spirally arranged around the outer circumference of the inner core; and in a cross section perpendicular to the first direction, a plurality of the wire bodies are arranged along the circumference of the inner core.

[0009] In some embodiments, the line body includes 2N wires, where N is a positive integer, and the wires can transmit signals and / or electrical energy, and each of the wires forms a transmission loop with another wire.

[0010] In some embodiments, the functional layer forms a plurality of transmission circuits, wherein a portion of the transmission circuits is used to transmit electrical energy, and another portion of the transmission circuits is used to transmit signals.

[0011] In some embodiments, the conductive wire includes a core wire, an insulating layer, and a shielding layer; the insulating layer covers an outer circumference of the core wire, and the shielding layer covers an outer circumference of the insulating layer.

[0012] In some embodiments, the shielding layer includes a plurality of metal wires, and the plurality of metal wires are cross-connected to form a mesh structure.

[0013] In some embodiments, the guide wire is configured such that the core wire is made of nickel-titanium alloy, the shielding layer is made of silver, and the insulating layer is made of polytetrafluoroethylene.

[0014] In some embodiments, the microguidewire includes an end and an extension portion, the portion of the functional core not covered by the covering layer forms the end, the portion of the functional core covered by the covering layer and the covering layer form the extension portion, and in a cross section perpendicular to the first direction, the radial dimension of the extension portion gradually decreases along the direction from the extension portion to the end.

[0015] In some embodiments, along the direction from the extension portion to the end head, the extension portion includes a supporting portion, a transition portion and a guide portion that are connected to each other; the supporting portion is cylindrical; along the direction from the extension portion to the end head, the radial dimensions of the transition portion and the guide portion gradually decrease.

[0016] In a second aspect, the present application proposes a minimally invasive interventional device, a detection element, a control component, and a microguidewire as described in the first aspect, wherein a functional layer at a first end of a functional core of the microguidewire is electrically connected to the detection element, and an end of the functional layer covered by the covering layer is electrically connected to the control component.

[0017] According to the micro-guidewire and minimally invasive interventional device of the embodiments of the present application, by providing a functional core with a functional layer and enabling at least a portion of the wire body of the functional layer to transmit signals and / or electric energy, the element for realizing position detection can be directly installed on the first end of the functional core and connected to the wire body capable of transmitting signals and / or electric energy. By replacing the functional components used to realize data transmission in the prior art with the wire body capable of transmitting signals and / or electric energy, the functions of the micro-guidewire can be effectively enriched, the overall structure of the minimally invasive interventional device can be simplified, and the operating difficulty of medical personnel can be reduced during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of the structure of a micro-guidewire provided in some embodiments of the present application;

[0020] Figure 2 A schematic diagram of a partial structure of a micro-guidewire according to another embodiment of the present application;

[0021] Figure 3 A schematic diagram of the partial structure of a wire provided in some embodiments of the present application.

[0022] The drawings are not necessarily drawn to scale.

[0023] Description of reference numerals:

[0024] 1. Functional core; 11. Inner core; 12. Functional layer; 121. Conducting wire; 1211. Core wire; 1212. Insulating layer; 1213. Shielding layer; 122. Transmission loop; 2. Covering layer; 3. Terminal; 4. Extension part; 41. Support part; 42. Transition part; 43. Guide part; X, first direction. DETAILED DESCRIPTION

[0025] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0026] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do 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. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0027] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0028] Minimally invasive interventional technology has the advantages of being fast, accurate, effective, easy to recover, and difficult to relapse. In recent years, it has gradually developed into one of the three major diagnostic and treatment technologies alongside internal medicine and surgery. When using minimally invasive interventional technology for diagnosis and treatment, it is usually necessary to use a micro-guidewire and a micro-catheter together. The micro-guidewire is placed inside the micro-guidewire and can slide along the micro-guidewire. After the location of the lesion area is determined by the micro-guidewire, the micro-guidewire is pulled out and the micro-guidewire is used to deliver drugs or micro-therapeutic devices to the lesion area. In general, the guidewire goes first and the catheter comes later. In clinical applications, the existing micro-guidewires only have the function of passive delivery, and cannot be operated intelligently by integrating sensors and actuators. For example, in order to locate the specific position of the end of the micro-guidewire in the blood vessel, it is usually necessary to continuously take X-rays to obtain the real-time position of the micro-guidewire and the micro-guidewire. However, the current micro-guidewires do not have the functions of power supply and signal transmission, and cannot effectively connect sensors and actuators.

[0029] The inventors found that the micro-guidewire itself only has the function of passively guiding the micro-catheter and does not have expandable information acquisition and operation functions. The main reason is that the micro-guidewire lacks power supply and signal transmission capabilities, and its practicality is relatively limited. It cannot reduce the burden on medical staff in clinical applications. To a certain extent, the level of intelligence in vascular intervention surgery is limited, and higher technical and experience requirements are placed on medical staff. In order to enrich the functions of the micro-guidewire on the basis of the guiding function, so that its end has the potential to integrate various sensors and actuators (including cameras, force sensors, ultrasonic generators, etc.), it is necessary to innovate the structure of the micro-guidewire and increase the anti-interference signal transmission and power supply functions without increasing the diameter of the micro-guidewire.

[0030] In view of the above problems found by the inventor, the inventor has improved the structure of the micro-guidewire and proposed a micro-guidewire, including a functional core and a covering layer; the functional core extends along a first direction, the functional core has a first end, the covering layer covers the outer peripheral surface of the functional core except the first end, and the first end can enter the lesion area; the functional core includes an inner core and a functional layer, the functional layer covers the outer peripheral surface of the inner core, and the functional layer includes a plurality of connected wires, at least a part of which can transmit signals and / or electrical energy. Thus, the element used to realize the detection can be electrically connected to the wire that can transmit signals and / or electrical energy in the micro-guidewire, so that the micro-guidewire itself has the ability to transmit signals or electrical energy, thereby enriching the function of the micro-guidewire and simplifying the process of obtaining the current state information of the micro-guidewire or the human body.

[0031] At the same time, the inventor also proposed a minimally invasive interventional device, which includes a detection element, a control component and the above-mentioned micro-guidewire, the functional layer at the first end of the functional core of the micro-guidewire is electrically connected to the detection element, and the end of the functional layer covered by the covering layer is electrically connected to the control component, that is, the wire body in the functional layer that can realize signal transmission and / or power transmission electrically connects the detection element to the control component. In clinical applications, the minimally invasive interventional device of the present application has multifunctional uses, and compared with the prior art, it omits the functional components for realizing data transmission, provides convenience to medical personnel in minimally invasive interventional surgery, and reduces the workload.

[0032] The embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1 and Figure 2 The embodiment of the present application provides a micro guidewire, a functional core 1 and a covering layer 2; the functional core 1 extends along a first direction X, the functional core 1 has a first end, the covering layer 2 covers the outer circumference of the functional core 1 except the first end, and the first end can enter the lesion area; the functional core 1 includes an inner core 11 and a functional layer, the functional layer covers the outer circumference of the inner core 11, and the functional layer includes a plurality of connected wires, at least a portion of which can transmit signals and / or electrical energy.

[0034] It can also be understood that the microguidewire includes an inner core 11, a functional layer 12 and a covering layer 2; the inner core 11 extends along the first direction X, and the movable end of the inner core 11 is used to enter the lesion area; the functional layer 12 is arranged on the outside of the inner core 11, and the functional layer 12 includes at least one wire 121, and the first end of the wire 121 is correspondingly arranged at the movable end of the inner core 11, and the first end of the wire 121 is used to electrically connect components; the covering layer 2 covers the second end of the wire 121, and in the first direction X, the movable end of the inner core 11 extends out of the covering layer 2.

[0035] For example, by adopting the above structure, the micro-guidewire has the function of signal transmission in addition to the substance delivery function. The micro-guidewire can be transformed into various forms according to different use requirements, for example, it can be bent or folded under the action of external force.

[0036] Optionally, in addition to the wire 121, the functional layer 12 may also include a support wire, which is connected to the wire 121 to form the functional layer 12. The wire 121 and the support wire may have the same outer dimensions, and the support wire does not have the function of transmitting signals or electrical energy, but only serves to fill the space between the guides and support the wire 121.

[0037] In some possible embodiments, the inner core 11 can be made of stainless steel material to play the role of transmitting torque and lateral support; illustratively, the inner core 11 can be set as an integral structure, or the inner core 11 can be formed by fixing a variety of structures by welding or the like. For example, the inner core 11 can be fixed by four stainless steel bars by welding, so that the four stainless steel bars are connected in sequence along the first direction X to form the inner core 11.

[0038] In the functional layer, the number of the wires 121 is set to 2N, where N is a positive integer, and each wire 121 is spirally arranged along the first direction X; in a plane perpendicular to the first direction X, multiple wires 121 are evenly arranged along the circumference of the inner core 11. Exemplarily, the number of the wires 121 can be set to 6, and every two wires 121 are used to form a transmission loop 122, that is, the functional layer has 3 transmission loops 122.

[0039] It is easy to understand that the transmission loop 122 can be configured to implement different functions. For example, the transmission loop 122 can be used to provide electrical energy to components, or, in the transmission loop 122, one of the conductors 121 is used to transmit signals to the components, and the other conductor 121 is used to receive signals from the components, so as to implement the signal transmission process of the components through the transmission loop 122.

[0040] Optionally, the lines of the functional layer 12 may be cross-connected to form a mesh structure to further enhance the structural strength of the functional layer 12 .

[0041] In some possible embodiments, some of the wires 121 among the multiple wires 121 are used to provide electrical energy to components; some of the wires 121 among the multiple wires 121 are used to transmit signals of components, and the wires 121 can have a variety of different implementation forms. For example, some of the wires 121 among the multiple wires 121 are used to transmit signals, and another part of the wires 121 are used to provide electrical energy. Alternatively, some of the wires 121 among the multiple wires 121 are used to transmit signals, some of the wires 121 are used to provide electrical energy, and the remaining wires 121 are only used to support and reinforce the micro-guidewires, and the embodiments of the present application do not impose further restrictions on this.

[0042] It is worth mentioning that some of the multiple wires 121 can also have both signal transmission function and power supply function. Therefore, the multiple wires 121 can not only perform signal transmission, but also have power supply function, further improving the functional practicality and integration of the micro guidewire.

[0043] Reference Figure 3The conductor 121 includes a core wire 1211, an insulating layer 1212 and a shielding layer 1213, wherein the core wire 1211 can be adjusted according to actual conditions. Exemplarily, the core wire 1211 can be set to a structure such as an optical fiber or an electric core, so that the core wire 1211 can be used to transmit signals and / or provide electrical energy to components. For example, the core wire 1211 can be made of nickel-titanium alloy or other alloy materials, and the diameter of the core wire 1211 is set to be less than 1 mm, for example, 30 microns can be selected; the insulating layer 1212 can be made of polytetrafluoroethylene (PTFE for short) or other insulating materials, and the insulating layer 1212 is arranged on the outside of the core wire 1211 to insulate and isolate the core wire 1211 and the shielding layer 1213 through the insulating layer 1212. The thickness of the insulating layer 1212 can be selected to be 50 microns, and the ratio between the thickness of the insulating layer 1212 and the core wire 1211 is 0.05 to 5. The shielding layer 1213 is arranged on the outside of the insulating layer 12121212. The shielding layer 1213 is used to isolate the signal from the external signal. Exemplarily, the shielding layer 1213 can be made of silver or other materials with good shielding function, such as other metal materials with high conductivity; the shielding layer 1213 includes a plurality of metal wires, and the plurality of metal wires are cross-arranged. The thickness of the shielding layer 1213 can be selected to be 30 microns to ensure that it has sufficient thickness to protect the functional core 1. The ratio between the thickness of the shielding layer 1213 and the diameter of the core wire 1211 is 0.01 to 10.

[0044] Moreover, by adopting the above structure, the conductor 121 includes a core wire 1211, a shielding layer 1213 and an insulating layer 1212. On the premise of ensuring that the conductor 121 has signal transmission capability and conductivity and does not increase the diameter of the micro guide wire, the anti-interference capability of the conductor 121 can be improved, thereby improving the stability of signal transmission of the conductor 121.

[0045] In some possible implementations, the cover layer 2 may be made of thermoplastic polyurethane (TPU for short) to ensure that it has good elasticity.

[0046] Reference Figure 1 The micro guide wire includes a terminal 3 and an extension portion 4. The portion of the first end of the functional core 1 not covered by the covering layer 2 forms the terminal 3, and the portion of the functional core 1 covered by the covering layer 2 and the covering layer 2 form the extension portion 4. The extension portion 4 may include a supporting portion 41, a transition portion 42 and a guide portion 43 connected to each other. With the plane perpendicular to the first direction X as the cross section, the radial dimensions of the transition portion 42 and the guide portion 43 gradually decrease in the direction close to the active end of the inner core 11.

[0047] Optionally, according to actual surgical needs, in various surgical instruments, the extension portion 4 may include only the support portion 41, or only the support portion 41 and the transition portion 42, or only the support portion 41 and the guide portion 43, or may include the support portion 41, the transition portion 42 and the guide portion 43 at the same time.

[0048] Exemplarily, the support portion 41 is configured as a cylindrical support portion 41, and the cylindrical support portion 41 is disposed at one end of the transition portion 42 away from the movable end of the inner core 11; in the first direction X, the length of the cylindrical support portion 41 can be adjusted according to actual conditions, for example, the length of the microguidewire is set to 1 meter to 5 meters, optionally 2 meters, the length of the covering layer 2 can be optionally 1.8 meters, the length of the cylindrical support portion 41 can be optionally 1 meter, and the ratio between the length of the covering layer 2 and the length of the microguidewire is 0.01 to 0.5, and the ratio between the length of the cylindrical support portion 41 and the length of the microguidewire is 0.01 to 1.

[0049] The transition portion 42 is set as a truncated cone transition portion 42, with a plane perpendicular to the first direction X as the cross-section, and the cross-sectional area of ​​the truncated cone transition portion 42 gradually decreases in the direction close to the movable end of the inner core 11; in the first direction X, the length of the truncated cone transition portion 42 can be selected as 0.5 meters, the cross-sectional diameter of the truncated cone transition portion 42 connecting the cylindrical support portion 41 can be selected as 100 microns, the cross-sectional diameter of the truncated cone transition portion 42 connecting the guide portion 43 can be selected as 50 microns, and the ratio between the length of the truncated cone transition portion 42 and the length of the micro guide wire is 0.01 to 0.7; the ratio between the cross-sectional diameter of the truncated cone transition portion 42 and the cross-sectional diameter of the micro guide wire is 0.1 to 1; the two ends of the truncated cone transition portion 42 are respectively connected to the cylindrical support portion 41 and the guide portion 43, and the cross-sectional shape and size of the two parts at each connection are kept consistent.

[0050] The guide portion 43 is connected to one end of the truncated cone transition portion 42 away from the cylindrical support portion 41. In the first direction X, the length of the guide portion 43 is less than the length of the truncated cone transition portion 42. The length of the guide portion 43 is set to 30 microns. The cross-sectional diameter of the guide portion 43 connected to the truncated cone transition portion 42 can be selected to be 50 microns. The cross-sectional diameter of the guide portion 43 away from the truncated cone transition portion 42 can be selected to be 30 microns, so that the end of the guide portion 43 away from the truncated cone transition portion 42 is smoothly connected to the functional core 1. The ratio between the length of the guide portion and the length of the micro guide wire is 0.01 to 0.5, the ratio between the cross-sectional diameter of the end of the guide portion connected to the truncated cone transition portion and the cross-sectional diameter of the micro guide wire is 0.1 to 1, and the cross-sectional diameter of the end of the guide portion 43 away from the truncated cone transition portion 42 is smaller than the cross-sectional diameter of the end of the guide portion 43 connected to the truncated cone transition portion 42.

[0051] To sum up, the microguidewire of the embodiment of the present application includes an inner core, a functional layer and a covering layer; the inner core extends along a first direction, and the movable end of the inner core is used to enter the lesion area; the functional layer is arranged on the outside of the inner core, and the functional layer includes at least one wire, and the first end of the wire is arranged correspondingly to the movable end of the inner core, and the first end of the wire is used to electrically connect components; the covering layer covers the second end of the wire, and in the first direction, the movable end of the inner core extends out of the covering layer. Therefore, when the active end of the inner core in the microguidewire cooperates with the microguidewire to deliver drugs or micro-devices into the lesion area, the first end of the wire can drive the components into the lesion area to obtain the current status information of the microguidewire or the human body through the components, so that the components can be electrically connected through the wire of the microguidewire, thereby enriching the function of the microguidewire, simplifying the process of obtaining the current status information of the microguidewire or the human body, effectively improving the intelligence level of vascular interventional surgery, and reducing the requirements for medical personnel's technology and experience. Without increasing the diameter of the microguidewire, the function of the microguidewire is enriched on the basis of the guiding function, so that the end of the microguidewire has the potential to integrate various sensors and actuators (including cameras, force sensors, ultrasonic generators, etc.), and increase anti-interference signal transmission and power supply functions.

[0052] An embodiment of the present application also provides a minimally invasive interventional device, which includes a detection element, a control component and the above-mentioned micro guidewire, wherein the functional layer at the first end of the functional core is electrically connected to the detection element, and the end of the functional layer covered by the covering layer is electrically connected to the control component. Specifically, the functional layer has a wire body for signal transmission and / or power transmission to realize the electrical connection between the detection element and the control component.

[0053] Exemplarily, the control component may be connected to the transmission circuit of the micro-guidewire, so that the signal transmission process of the detection element and the process of transmitting electrical energy to the detection element can be realized through the transmission circuit.

[0054] In some possible implementations, the control component can transmit and receive signals, and the control component can be an independent device or a collection of multiple connected devices. The control component can also have a control function, for example, it can be a controller with signal transmission and reception capabilities. The control component itself can also have a display function, for example, it can be configured with a display panel, or the control component can be connected to an external display device. The control component can be configured with a power supply device, such as a battery, or the control component can also be connected to an external power supply device.

[0055] The detection element can be of various structures, for example, it can be a probe with force sensing function, or a camera with image sensing function, or a micro robot with surgical operation function, etc. The detection element can be one or more, and the functions of multiple detection elements can be the same or different. Alternatively, a detection element can be integrated with multiple functions at the same time, which can further improve the versatility of minimally invasive interventional devices in clinical applications, thereby improving their practicality. In clinical applications, the detection element can be configured into a variety of different functional modes according to the different application scenarios of minimally invasive interventional surgery, and this application does not impose any restrictions on this.

[0056] It should be noted that the signal referred to in the embodiments of the present application can be either an electrical signal or an optical signal.

[0057] The minimally invasive interventional device of the present application has multifunctional uses. In clinical applications, it can replace some auxiliary medical means in minimally invasive interventional surgery, provide operation convenience for minimally invasive interventional surgery, reduce the difficulty of surgery, and reduce the burden on medical personnel. In addition, the micro-guidewire of the minimally invasive interventional device of the present application has a high degree of integration, which can minimize the working diameter of the micro-guidewire and expand the application scenarios of the minimally invasive interventional device.

[0058] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A micro guide wire, characterized in that: including a functional core and a covering layer; The functional core extends along a first direction, the functional core has a first end, the covering layer covers the outer peripheral surface of the functional core except the first end, and the first end can enter the lesion area; The portion of the functional core not covered by the covering layer forms an end cap, the portion of the functional core covered by the covering layer and the covering layer form an extension portion, and in a cross section perpendicular to the first direction, along the direction from the extension portion to the end cap, the radial dimension of the extension portion gradually decreases; The functional core comprises an inner core and a functional layer, wherein the functional layer covers the outer peripheral surface of the inner core, and the functional layer comprises a plurality of connected wire bodies, at least a portion of which can transmit signals and / or electrical energy; Each of the wire bodies is spirally arranged around the outer circumference of the inner core; and in a cross section perpendicular to the first direction, a plurality of the wire bodies are arranged along the circumference of the inner core; Alternatively, the wires are crossed to form a mesh structure.

2. The micro guide wire according to claim 1, characterized in that: The line body includes a plurality of connected support wires and 2N conductive wires, where N is a positive integer. The conductive wires can transmit signals and / or electrical energy, and each conductive wire and another conductive wire form a transmission loop.

3. The micro guide wire according to claim 2, characterized in that: The functional layer forms a plurality of transmission circuits, a portion of which is used to transmit electrical energy, and another portion of which is used to transmit signals.

4. The micro guide wire according to claim 2 or 3, characterized in that: The conductive wire comprises a core wire, an insulating layer and a shielding layer; the insulating layer covers the outer peripheral surface of the core wire, and the shielding layer covers the outer peripheral surface of the insulating layer.

5. The micro guide wire according to claim 4, characterized in that: The shielding layer includes a plurality of metal wires, and the plurality of metal wires are cross-connected to form a mesh structure.

6. The micro guide wire according to claim 4, characterized in that: The conductor is configured such that the core wire is made of an alloy material, the shielding layer is made of a conductive material, and the insulating layer is made of an insulating material.

7. The micro guide wire according to claim 1, characterized in that: Along the direction from the extension portion to the end, the extension portion includes a supporting portion, a transition portion and a guiding portion connected to each other; The support portion is cylindrical; Along the direction from the extending portion to the end head, the radial dimensions of the transition portion and the guide portion are gradually reduced.

8. A minimally invasive interventional device, characterized in that: include: A detection element, a control component, and a micro guidewire as described in any one of claims 1 to 7, wherein the functional layer at the first end of the functional core of the micro guidewire is electrically connected to the detection element, and the end of the functional layer covered by the covering layer is electrically connected to the control component.

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