CN117323549A - Microcatheter and endovascular interventional device - Google Patents

Abstract

The present invention provides a microcatheter and endovascular interventional device, the microcatheter comprising: a head end, a pipe body, an anchor, and a regulator; the head end is arranged at the distal end part of the pipe body; the regulator is arranged at the proximal end of the tube body; the anchor is at least partially arranged on the outer side of the distal end of the pipe body and circumferentially distributed around the pipe body, the distal end part of the anchor is connected with the head end, and the proximal end part of the anchor is connected with the regulator; the adjuster is used to drive the anchor into radial expansion or contraction movement to adjust the outer diameter of the support defined by the anchor. The invention can improve the support performance of the microcatheter so as to provide better acting force for the guide wire, so that the guide wire can better meet the clinical use requirement.

Description

Microcatheter and endovascular interventional device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a microcatheter and an intravascular interventional device.

Background

Percutaneous Coronary Intervention (PCI) is mainly used to treat obstructive coronary artery disease, which develops rapidly due to the advantages of micro-trauma, time saving, safety and high efficiency. In addition, PCI has high surgical success rate and good curative effect on left trunk lesions, chronic Total Occlusion (CTO) lesions, severe calcification lesions and the like. CTO surgery, however, often requires the use of microcatheters that utilize their traversability and support for their guidewires, often plays a critical role in the success of the procedure.

Most clinicians currently pass through the site of CTO lesions through the cooperation of microcatheters and guidewires. Microcatheters can enhance the steering, support and safety of the guidewire, and can significantly enhance the ability of the guidewire to traverse occlusive lesions. However, when the existing microcatheter enters the occlusion lesion in the forward direction, the following force of the guide wire and the microcatheter is insufficient, and the microcatheter cannot provide enough support for the guide wire, so that the microcatheter cannot continue to advance and must be withdrawn when the microcatheter passes through the occlusion lesion to half. In addition, when some microcatheters are assembled with active guide wires for use, energy (such as shock waves and the like) needs to be transmitted to the distal end through the proximal end of the guide wire, so that the therapeutic effect is realized by contacting with the lesion, but the microcatheters cannot be stably anchored in blood vessels due to the defect of self-supporting property, and cannot give the guide wire a good fixing effect in the radial direction of the microcatheters, so that the guide wire can move in the radial direction of the microcatheters, the energy transmission loss of the guide wire is caused, the energy transmission efficiency is influenced, and the therapeutic effect of the guide wire on the lesion cannot be realized. Therefore, it is a technical problem to be solved by those skilled in the art how to design a microcatheter with high support performance.

It should be noted that the information disclosed in the background section of the present application is only for enhancement of understanding of the general background of the present application and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a microcatheter and an intravascular interventional device, which are used for solving the problem that the existing microcatheter has insufficient supporting force.

To achieve the above object, the present invention provides a microcatheter comprising: a head end, a pipe body, an anchor, and a regulator;

the head end is arranged at the distal end part of the pipe body;

the regulator is arranged at the proximal end of the tube body;

the anchor is at least partially arranged on the outer side of the distal end of the pipe body and circumferentially distributed around the pipe body, the distal end part of the anchor is connected with the head end, and the proximal end part of the anchor is connected with the regulator;

the adjuster is configured to drive the anchor in a radial expansion or contraction motion to adjust an outer diameter of a support defined by the anchor.

Optionally, the distal end portion is disposed on the outer side of the distal end of the tube body and circumferentially disposed around the tube body, and the proximal end portion is movably disposed through the tube body;

the adjuster is used for driving the proximal end portion to move along the axial direction of the tube body, and then the proximal end portion drives the distal end portion to perform radial expansion or contraction movement.

Optionally, the anchor comprises a support wire, the proximal end portion of the support wire is movably arranged in the pipe body in a penetrating manner and is connected with the adjuster, the distal end portion of the support wire is connected with the head end on the outer side of the distal end of the pipe body, and the distal end portion of one or more support wires is/are circumferentially distributed around the pipe body.

Optionally, the tube body includes at least an inner layer and an outer layer, the proximal portion being movably disposed through the outer layer.

Optionally, the number of the support wires is one, and the distal end portion of one support wire is circumferentially arranged around the tube body in a spiral manner.

Optionally, the number of the supporting wires is multiple, the proximal end portion of each supporting wire is movably penetrating through the pipe body and connected with the adjuster, the distal end portion of each supporting wire is connected with the head end outside the distal end of the pipe body, and all the distal end portions of the supporting wires are circumferentially distributed around the pipe body.

Optionally, the number of the supporting wires is 2-8.

Optionally, the support wire adopts a shape memory alloy wire, or the support wire adopts a composite structure of the shape memory alloy wire and the developable wire.

Optionally, the adjuster is slidably or rotatably disposed at the proximal end of the tube body.

Optionally, the adjuster includes a housing fixed to the proximal end of the tube body and a dial rotatably disposed within the housing, the adjuster being configured to drive the anchor for radial expansion or contraction movement by rotation of the dial.

Optionally, the distal end of the tube body is provided with a developing mark, and the structure of the anchor arranged outside the distal end of the tube body covers the developing mark.

Based on the same inventive concept, the invention also provides an intravascular interventional device comprising a guide wire and any one of the microcatheters, wherein the guide wire is used for being movably penetrated into the microcatheter.

In summary, the microcatheter provided by the present invention includes: a head end, a pipe body, an anchor, and a regulator; the head end is arranged at the distal end part of the pipe body; the regulator is arranged at the proximal end of the tube body; the anchor is at least partially arranged on the outer side of the distal end of the pipe body and circumferentially distributed around the pipe body, the distal end part of the anchor is connected with the head end, and the proximal end part of the anchor is connected with the regulator; the adjuster is configured to drive the anchor in a radial expansion or contraction motion to adjust an outer diameter of a support defined by the anchor. The micro-catheter can be anchored in the blood vessel through the self-contained anchor, and the micro-catheter is particularly considered to be anchored at the corner of the blood vessel, so that sufficient supporting force can be provided for the guide wire, the control performance of the guide wire is enhanced, and the guide wire can better meet various clinical use requirements.

In addition, the anchor can also adjust the support external diameter under the control of the regulator, so that the support external diameter is adapted to the blood vessel size, the anchoring effect can be enhanced, and the microcatheter can be adapted to blood vessels of different sizes, and is flexible and convenient to use.

Because the intravascular interventional device provided by the application and the microcatheter provided by the application belong to the same invention conception, the intravascular interventional device provided by the application has all the advantages of the microcatheter provided by the application, and the beneficial effects of the intravascular interventional device provided by the application are not repeated here.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

FIG. 1 is a schematic illustration of an application scenario of a conventional microcatheter in combination with a guidewire to traverse a stenotic lesion;

FIG. 2 is a schematic view of a microcatheter according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a pipe body provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of an application scenario of a microcatheter according to an embodiment of the present invention for crossing stenotic lesions in cooperation with a guidewire, wherein the microcatheter is anchored in a vessel by adjusting the outer diameter of the support wire;

FIG. 5 is a schematic view of a microcatheter provided in accordance with another embodiment of the invention;

FIG. 6 is a cross-sectional view of the microcatheter of FIG. 5 taken along the line A-A.

In the accompanying drawings:

1-an existing microcatheter; 2-tortuous vessels; 3-a guidewire; 4-stenosis;

100-microcatheter; 101-headend; 102, a pipe body; 1021-an inner layer; 1022—an intermediate layer; 1023-an outer layer; 103-anchors; 1031-supporting wires; 104-a regulator; 1041-a housing; 1042-rotating disc; 105-developing the mark; 106-a sheath; 107-connecting piece; d1-support outer diameter.

Detailed Description

The invention will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.

As used in this disclosure, the singular forms "a," "an," "the," and "the" include plural referents, the term "or" is generally used in the sense of comprising "and/or" and the term "several" is generally used in the sense of comprising "at least one," the term "at least two" is generally used in the sense of comprising "two or more," and, furthermore, the terms "first," "second," "third," are used for descriptive purposes only and are not to be construed as indicating or implying any particular importance or quantity of technical features indicated. Thus, a feature defining "first," "second," "third," or the like, may explicitly or implicitly include one or at least two such features, with "one end" and "another end" and "proximal end" and "distal end" generally referring to the corresponding two portions, including not only the endpoints. Furthermore, as used in this disclosure, "mounted," "connected," and "disposed" with respect to another element should be construed broadly to mean generally only that there is a connection, coupling, mating or transmitting relationship between the two elements, and that there may be a direct connection, coupling, mating or transmitting relationship between the two elements or indirectly through intervening elements, and that no spatial relationship between the two elements is to be understood or implied, i.e., that an element may be in any orientation, such as internal, external, above, below, or to one side, of the other element unless the context clearly dictates otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, directional terms, such as above, below, upper, lower, upward, downward, left, right, etc., are used with respect to the exemplary embodiments as they are shown in the drawings, upward or upward toward the top of the corresponding drawing, downward or downward toward the bottom of the corresponding drawing.

As used herein, "proximal" refers to the end that is closer to the operator when in use, and "distal" refers to the end that is farther from the operator when in use; the term "axial" generally refers to the direction of the microcatheter along its axis, "radial" generally refers to the direction of the microcatheter perpendicular to its axis, and "circumferential" generally refers to the direction about the axis of the microcatheter.

Aiming at the problem that the existing microcatheter product has insufficient supporting force, the invention provides a novel microcatheter which can realize the anchoring in a blood vessel through a self-contained anchor, so as to provide sufficient supporting force for a guide wire, enhance the control performance of the guide wire and enable the guide wire to better meet various clinical use requirements.

The invention also provides an intravascular interventional device comprising a guide wire and the microcatheter of the invention, wherein the guide wire is used for being movably penetrated into the microcatheter of the invention. The guide wire related to the invention can be an active guide wire and a passive guide wire; active means that the guidewires can input and output energy for treatment of disease, and passive means that the guidewires do not require energy.

The microcatheter provided by the invention is not limited to use in CTO surgery, and can be used alone or in combination with various functional catheters in CTO surgery.

The following description is made with reference to the accompanying drawings.

The operation of the microcatheter 1 in clinical use is shown in fig. 1. Fig. 1 illustrates an application scenario in a PCI procedure in which a guidewire 3 is assisted through a tortuous vessel 2 and a stenotic lesion 4 by a microcatheter 1. The micro-catheter 1 is hollow, so that the guide wire 3 can pass through the inner cavity of the micro-catheter 1 to work. Also, because the micro-catheter 1 is hollow, the distal end of the micro-catheter 1 cannot be pre-plasticized to provide anchoring, and only the original straight shape can be maintained, so that the micro-catheter 1 cannot provide good supporting force in the tortuous vessel 2 in the operation process.

Referring to fig. 2 to 6, in order to solve the above-mentioned problems, the present invention provides a novel microcatheter 100, which includes a head end 101, a tube body 102, an anchor 103 and a regulator 104. The head end 101 is generally a conical head, which reduces the resistance of the distal end of the microcatheter 100 in the blood vessel during delivery, facilitating delivery. The head end 101 is a soft structure, and can prevent the blood vessel tissue from being stabbed. The head end 101 is provided at the distal end of the tube body 102. A regulator 104 is provided at the proximal end of the tubular body 102. The anchor 103 is at least partially disposed distally outwardly of the tubular body 102 and circumferentially disposed about the tubular body 102. The anchor 103 has a distal portion and a proximal portion, the distal portion being further from the proximal end of the microcatheter 100 than the proximal portion. The distal portion of the anchor 103 is connected to the head end 101, the proximal portion of the anchor 103 is connected to the adjustor 104, i.e., the distal end of the distal portion is connected to the head end 101 and the proximal end of the proximal portion is connected to the adjustor 104. It is to be appreciated that the structure of the anchor 103 disposed distally outwardly of the tubular body 102 serves as an anchor and defines an annular support profile having a support outer diameter D1. The adjuster 104 is used to drive the anchor 103 in a radial expansion or contraction movement to adjust the support outer diameter D1 defined by the anchor 103. It will be appreciated that the head end 101 has the function of fixing the distal end of the anchor 103 and the adjuster 104 has the function of pulling the proximal end of the anchor 103 so that the proximal end of the anchor 103 can be moved relative to the distal end, thereby changing the support outer diameter D1 of the anchor 103.

Therefore, the anchor 103 can provide a good supporting force on the whole circumference of the tube body 102, and can be fixed against the vessel wall under a certain supporting outer diameter D1, and the structural design greatly improves the supporting performance of the microcatheter 100 in the tortuous vessel 2, enhances the operability of the microcatheter 100 on the guide wire 3, and enables the guide wire 3 to better meet various clinical use requirements.

In an application scenario, the microcatheter 100 of the embodiment of the invention can be used with the passive guide wire 3, provides better acting force on the passive guide wire 3 in the axial direction, ensures that the trend of the guide wire 3 is more accurate, effectively avoids entering a vascular interlayer and a false cavity, and reduces the risk of thrombus occurrence, thereby helping the guide wire 3 to open the stenosis 4, saving the operation time and meeting the clinical use requirement of the passive guide wire.

In another application scenario, the microcatheter 100 of the embodiment of the invention can be matched with the active guide wire 3 for use, and gives a better fixing effect to the active guide wire 3 in the radial direction, so that the disturbance of the active guide wire 3 in the radial direction of the microcatheter 100 is reduced, the energy transmission loss from the proximal end to the distal end of the guide wire 3 is reduced, and the clinical treatment requirement of the guide wire 3 is met.

In general, the microcatheter 100 of embodiments of the present invention may be used in conjunction with an active or passive guidewire to provide vascular lesion opening, during which high support of the microcatheter 100 is achieved by the anchor 103 at the distal end of the catheter, providing better force to the guidewire 3.

Optionally, a distal portion of the anchor 103 is disposed distally outwardly of the tubular body 102 and circumferentially around the tubular body 102, and a proximal portion of the anchor 103 is movably disposed through the tubular body 102. At this time, the adjuster 104 is used to drive the proximal portion of the anchor 103 to move along the axial direction of the tube body 102, and then the distal portion of the anchor 103 is driven by the proximal portion of the anchor 103 to perform radial expansion or contraction movement, so as to adjust the support outer diameter D1 defined by the distal portion of the anchor 103, ensure that the support outer diameter D1 of the distal portion of the anchor 103 can be adapted to the size of the blood vessel, enhance the anchoring effect, and enable the microcatheter 100 to be adapted to vessels of different sizes, and be flexible and convenient to use. In this manner, the anchor 103 may be partially disposed outside the distal end of the tube body 102 to perform an anchoring function, and the remainder may be disposed within the tube body 102 to connect the regulator 104 and avoid exposure to the outside. However, it should be understood that as the support outer diameter D1 of the anchor 103 changes, the size morphology of the distal portion of the anchor 103 may be inverted rather than fixed. Moreover, in other embodiments, the anchors 103 may be provided entirely outside the distal end of the tubular body 102 to serve as anchors.

The microcatheter 100 of the present embodiment can be used for a variety of clinical applications, and the tube body 102 is preferably a multi-layer structure, at least two-layer structure, and more preferably a three-layer structure or a four-layer structure. When the body 102 is a multi-layered structure, it includes at least an inner layer 1021 and an outer layer 1023 (see fig. 3), and the proximal portion of the anchor 103 is movably disposed through the outer layer 1023.

In more detail, referring to fig. 3, the wall thickness of the outer layer 1023 is provided with a lumen (not labeled) extending from the distal end of the tube body 102 to the proximal end of the tube body 102 that allows the proximal portion of the anchor 103 to pass through. The number of lumens depends on the configuration of the anchor 103. The placement of the proximal portion of the anchor 103 in the wall thickness of the outer layer 1023 of the tubular body 102 does not interfere with the function of the tubular body 102 itself nor does it increase the radial dimension of the tubular body 102.

With continued reference to fig. 3, in this embodiment, the pipe body 102 has a three-layer structure; the inner layer 1021 is made of a high polymer material with a low friction coefficient so as to reduce the friction force when the inner surface of the micro-catheter 100 is contacted with the guide wire 3; the middle layer 1022 adopts a braiding structure or a coiling structure or a combination of the braiding structure and the coiling structure so as to enhance the pushing performance and the torsion control performance of the catheter; the outer layer 1023 is made of a polymer material with relatively high strength. In other embodiments, the inner layer 1021 and the middle layer 1022 may be combined into a single layer structure, resulting in a two layer structure of the tubular body 102. It should be noted that the materials of the inner layer 1021, the middle layer 1022 and the outer layer 1023 are not limited in this invention, and those skilled in the art should find the existing materials to achieve the functions or the corresponding effects required by these structures, and the specific materials will not be described in detail.

In this embodiment, the anchor 103 is made of a metallic material having excellent flexibility and high strength, including but not limited to nickel-titanium alloy, unlike the balloon, and may be made of a material having excellent biocompatibility, corrosion resistance, high strength, and easy processing, such as stainless steel, titanium alloy, etc. The more suitable material is a shape memory alloy material or a composite structure thereof, can automatically recover the shape in vivo, and can provide stronger radial support. A composite structure is herein understood to be a mixture of shape memory alloy material and other metallic materials. Optionally, the anchor 103 has a developing function, such as preparing the anchor 103 with a composite structure of shape memory alloy wires and developable wires, so that an operator can confirm the opened state and the contracted state of the anchor 103 intraoperatively. In addition, the anchor 103 may be made of a non-self-expanding metal material in addition to the self-expanding material.

The anchor 103 can have various structural forms, so long as the anchor 103 can be expanded and contracted under the traction of the regulator 104, and the anchor 103 can not block the blood vessel, so as to ensure the smoothness of blood flow. Exemplary descriptions are provided below.

In some embodiments, the anchor 103 employs a mesh stent, such as a braided or cut stent. The net-shaped support can be arranged on the outer side of the distal end of the tube body 102 and is distributed around the tube body 102, the tube body 102 penetrates through the net-shaped support, the proximal end portion of the net-shaped support can be connected with the adjuster 104 through a plurality of traction wires, and the distal end portion of the net-shaped support is fixed with the head end 101, so that the net-shaped support can move relative to the distal end under the driving of the adjuster 104, the support outer diameter D1 is changed, and anchoring is realized according to the size of a blood vessel.

Referring to fig. 2-6, in another embodiment, the anchor 103 includes at least one support wire 1031, a proximal portion of the support wire 1031 being movably disposed within the tube body 102 and coupled to the adjustor 104, a distal portion of the support wire 1031 being coupled to the head end 101 outside of the distal end of the tube body 102. Wherein the distal portion of the one or more support wires 1031 is disposed distally outwardly of the tube body 102 and circumferentially disposed about the tube body 102 in such a manner as to form an annular support profile for facilitating abutment against the vessel wall. In this case, when the anchor 103 is constructed using the support wire 1031, the structure is simple, the processing and the assembly are convenient, and the size of the micro-catheter 100 is not excessively increased, so that the micro-catheter 100 can be conveniently introduced into a small and more distal blood vessel, and the micro-catheter 100 can be conveniently withdrawn.

The support wire 1031 is a wire-like structure, the shape change of which is hollow, does not block the blood vessel, and can realize the change of a plurality of support outer diameters D1 so as to adapt to the size selection of different blood vessels. The support outer diameter D1 refers to the diameter of the annular support profile defined by the one or more support wires 1031, which is adapted to the inner diameter of the vessel for which anchoring support is desired. The support wires 1031 may be secured to the head end 101 by any suitable means, such as laser welding, glue bonding, or the like, to the head end 101. Optionally, the surface of the support wire 1031 is provided with a functional coating, such as an anticoagulant coating, a thrombus formation-preventing coating, or other coating. The support wire 1031 is mainly abutted in a non-damaging manner when contacting the vessel wall, thereby reducing damage to the vessel wall. The support wire 1031 may be a round wire or a flat wire or other shaped wire structure.

Referring to fig. 2 to 4, in an exemplary embodiment, the number of the support wires 1031 is one, and the distal end portion of one support wire 1031 is circumferentially arranged around the pipe body 102 in a spiral manner. Therefore, anchoring can be realized by only providing one supporting wire 1031, and the structure is simpler and the operation is convenient. When the support wire 1031 is one, it is also only necessary to provide a channel in the wall thickness of the outer layer 1023 for the passage of one support wire 1031. Optionally, the surface of the channel in the wall thickness of the outer layer 1023 may provide sufficient friction to enhance manipulation of the anchor 103.

Referring to fig. 4, taking a support wire 1031 as an example, in actual use, when the distal end of the microcatheter 100 according to the embodiment of the present invention is advanced toward the angled blood vessel 2 or advanced toward the bifurcated blood vessel 2, the regulator 104 may be used to "feed" the support wire 103 toward the distal end of the microcatheter 100, so as to change the shape of the support wire 103 and increase the support outer diameter D1 thereof, thereby enabling the distal end of the microcatheter 100 to be anchored in the tortuous blood vessel segment by the support wire 1031, and providing a better supporting force to the guide wire 3 to assist the guide wire 3 to pass through the stenotic lesion 4. After the action of the microcatheter 100 is completed, the regulator 104 can perform wire collection to the proximal end, so that the support outer diameter D1 of the support wire 103 is reduced, and the microcatheter 100 is conveniently withdrawn from a human body.

Referring also to fig. 5 and 6, in another exemplary embodiment, the number of support wires 1031 is a plurality, e.g., two or more, with the proximal portion of each support wire 1031 movably disposed within the tube body 102 and connected to the adjustor 104, the distal portion of each support wire 1031 being connected to the head end 101 outside the distal end of the tube body 102, and the distal portions of all support wires 1031 being circumferentially disposed around the tube body 102. In this embodiment, the regulator 104 may control all the support wires 1031 simultaneously, or may implement separate control of each support wire 1031. The adjuster 104 can vary the support outer diameter D1 collectively defined by the plurality of support wires 1031 and can achieve modulation of the multi-speed support outer diameter D1. The plurality of support wires 1031 are distributed 360 ° circumferentially around the axis of the pipe body 102, and adjacent support wires 1031 form a hollow structure, similarly to being distributed in a "petal shape". So configured, it is advantageous to place microcatheter 100 and guidewire 3 at the very center of vessel 2, which is particularly true for active-type guidewires 3. When the microcatheter 100 of the embodiment of the invention is matched with the active guide wire 3 for use, the microcatheter 100 gives the guide wire 3 a better fixing effect in the radial direction, reduces the disturbance of the guide wire 3 in the radial direction, realizes the energy transmission enhancement of the guide wire 3, and meets the clinical treatment requirement of the guide wire 3. The contour shape defined by the plurality of support wires 1031 is not limited.

In the illustrated exemplary embodiment, the number of the support wires 1031 is 6, but this may not be limiting in practice. The number of the supporting wires 1031 can be selected to be 2-8, so that the pressure on the blood vessel can be reduced, and the risk of vascular injury is reduced. When the number of the supporting wires 1031 is plural, plural channels are provided in the wall thickness of the outer layer 1023 for the plural supporting wires 1031 to pass through, and basically, the number of the channels corresponds to the number of the supporting wires 1031 one by one. Alternatively, the support wire 1031 may be a shape memory alloy wire, or the support wire 1031 may be a composite structure of a shape memory alloy wire and a developable wire.

Further, the adjustor 104 may be slidably or rotatably disposed at the proximal end of the tubular body 102, i.e., the adjustor 104 may pull the anchor 103 by rotating or sliding. Optionally, a knob 104 is rotatably disposed at the proximal end of the tubular body 102.

Referring to fig. 2, in one embodiment, the adjuster 104 is rotatably disposed at a proximal end of the tube 102, and the adjuster 104 includes a housing 1041 and a rotary disk 1042, wherein the housing 1041 is fixed at the proximal end of the tube 102, and the rotary disk 1042 is rotatably disposed in the housing 1041, such that the adjuster 104 can drive the anchor 103 to perform a radial expansion or contraction motion by rotating the rotary disk 1042. As in the present embodiment, the adjuster 104 may drive the proximal portion of the anchor 103 to move axially along the tubular body 102 by rotation of the dial 1042, which in turn drives the distal portion of the anchor 103 to radially expand or contract. In one embodiment, the turntable 1042 is coupled to one or more support wires 1031 to effect a stretching traction of the single or multiple support wires 1031.

Referring to fig. 2, optionally, the distal end of the tube body 102 is provided with a visualization mark 105 for locating the distal position of the microcatheter 100. The development mark 105 may be any of a variety of structures, such as a development ring, development dots, development segments, development holes, or the like. Further, a structure in which the anchor 103 is disposed outside the distal end of the tube body 102 covers the development mark 105 so that the position of the anchor 103 is determined by the development mark 105.

With continued reference to fig. 2, microcatheter 100 also optionally includes a sheath 106 and a connector 107. Sheath 106 is wrapped around the proximal end of tubular body 102 and connector 107 is disposed on the proximal end of sheath 106. The connector 107 has a luer fitting that can be connected to an external device to expand the functionality of the microcatheter 100, such as to access an external device for aspiration, infusion, etc. At this time, the mounting position of the regulator 104 on the proximal end of the tube 102 is not particularly limited, and is not limited to the position shown in the drawings.

In summary, in the microcatheter and the endovascular interventional device provided by the present invention, the microcatheter comprises: a head end, a pipe body, an anchor, and a regulator; the head end is arranged at the distal end part of the pipe body; the regulator is arranged at the proximal end of the tube body; the anchor is at least partially arranged on the outer side of the distal end of the pipe body and circumferentially distributed around the pipe body, the distal end part of the anchor is connected with the head end, and the proximal end part of the anchor is connected with the regulator; the adjuster is configured to drive the anchor in a radial expansion or contraction motion to adjust an outer diameter of a support defined by the anchor. So configured, when the microcatheter is required to cooperate with the guide wire to intervene in the blood vessel, the microcatheter can be fixed in the blood vessel through the anchor device with the microcatheter, so that a better supporting effect can be provided for the guide wire, the control performance of the guide wire is enhanced, and the guide wire can better meet various clinical use requirements. The anchor can also adjust the outer diameter of the support under the control of the regulator, so that the outer diameter of the support is adapted to the size of the blood vessel, the anchoring effect can be enhanced, and the microcatheter can be adapted to blood vessels with different sizes, and is flexible and convenient to use.

In addition, when the microcatheter is matched with the passive guide wire for use, better acting force is provided for the passive guide wire in the axial direction, so that the trend of the guide wire is more accurate, the guide wire is effectively prevented from entering a vascular interlayer and a false cavity, the risk of thrombus occurrence is reduced, the guide wire is helped to open a stenosis, the operation time is saved, and the clinical use requirement of the passive guide wire is met.

In addition, when the microcatheter is matched with an active guide wire for use, the active guide wire is given better fixing effect in the radial direction, so that the disturbance of the active guide wire in the radial direction is reduced, the energy transmission loss from the proximal end to the distal end of the guide wire is reduced, and the clinical treatment requirement of the guide wire is met.

It should be noted that the above embodiments may be combined with each other. The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present invention.

Claims (12)

1. A microcatheter, comprising: a head end, a pipe body, an anchor, and a regulator;

the head end is arranged at the distal end part of the pipe body;

the regulator is arranged at the proximal end of the tube body;

the anchor is at least partially arranged on the outer side of the distal end of the pipe body and circumferentially distributed around the pipe body, the distal end part of the anchor is connected with the head end, and the proximal end part of the anchor is connected with the regulator;

the adjuster is configured to drive the anchor in a radial expansion or contraction motion to adjust an outer diameter of a support defined by the anchor.

2. The microcatheter of claim 1, wherein the distal portion is disposed distally outwardly of the shaft and circumferentially around the shaft, the proximal portion being movably disposed through the shaft;

the adjuster is used for driving the proximal end portion to move along the axial direction of the tube body, and then the proximal end portion drives the distal end portion to perform radial expansion or contraction movement.

3. The microcatheter of claim 2, wherein the anchor comprises a support wire, the proximal portion of the support wire movably threaded into the shaft and connected to the regulator, the distal portion of the support wire connected to the head end on the distal outside of the shaft, the distal portion of one or more of the support wires circumferentially routed around the shaft.

4. The microcatheter of claim 2, wherein the tube body comprises at least an inner layer and an outer layer, the proximal portion being movably disposed through the outer layer.

5. A microcatheter as in claim 3, wherein the number of support wires is one and the distal portion of one support wire is circumferentially disposed in a spiral fashion around the shaft.

6. A microcatheter as in claim 3 wherein said number of support wires is a plurality, said proximal portion of each of said support wires being movably disposed through said tube body and connected to said adjustor, said distal portion of each of said support wires being connected to said head end outside of the distal end of said tube body, said distal portions of all of said support wires being circumferentially disposed around said tube body.

7. The microcatheter of claim 6, wherein the number of support wires is 2-8.

8. The microcatheter of claim 3, wherein the support wire is a shape memory alloy wire or a composite of a shape memory alloy wire and a developable wire.

9. The microcatheter of any of claims 1-8, wherein the adjustor is slidably or rotatably disposed at the proximal end of the shaft.

10. The microcatheter of claim 9, wherein the adjustor comprises a housing secured to the proximal end of the shaft and a dial rotatably disposed within the housing, the adjustor being configured to drive the anchor into radial expansion or contraction movement by rotation of the dial.

11. The microcatheter of any of claims 1-8, wherein the distal end of the shaft is provided with a development mark and the anchor is configured to cover the development mark on the outside of the distal end of the shaft.

12. An endovascular access device comprising a guidewire and a microcatheter according to any one of claims 1-11, the guidewire being for removable threading into the microcatheter.