A cutting catheter and cutting system

Abstract

The application relates to a cutting catheter and a cutting system. The cutting catheter comprises a pipe body, a cutting assembly and an opening and closing assembly. The opening and closing assembly comprises split parts, support pieces, a first limiting part and a sliding part. The split parts are arranged outside the cutting piece and form a containing space. The proximal end and the distal end of the split parts are respectively provided with the support pieces and connected with one end of the support pieces. The other end of the support piece arranged at the distal end of the split part is connected with the first limiting part. The other end of the support piece arranged at the proximal end of the split part is connected with the sliding part. The middle part of the support piece between the two ends has a certain flexibility. When the sliding part slides, the middle part can bend outward and drive the split parts to move outward to an open state in which the cutting piece is exposed, or the middle part can drive the split parts to move to a closed state in which the cutting piece is contained. The opening and closing assembly is arranged, the contact between the cutting piece and the inside of the blood vessel is avoided, the risk of blood vessel injury is reduced, and the safety performance is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a cutting catheter and a cutting system. BACKGROUND

[0002] The straight-through catheter products in the prior art, such as balloon products, have good effects on relatively thin and soft blocked tissues when dredging blood vessels, but not all blood vessels can use balloon products, for example, when encountering blocked tissues hardened and viscous due to deposition, the straight-through catheter products have poor dredging effect. Therefore, the existing catheter products need to be improved so that they can effectively treat the inner wall of the blood vessel blocked by diseased tissues. SUMMARY

[0003] The purpose of the present application is to provide a cutting catheter and a cutting system with cutting function.

[0004] To achieve the above purpose, the technical solution adopted by the present application is:

[0005] A cutting catheter, comprising a hollow tube body;

[0006] A cutting assembly, the cutting assembly comprising a rotating shaft rotatably arranged in the tube body and a cutting piece, the distal end portion of the rotating shaft extending out of the tube body, and the cutting piece being arranged on the distal end portion of the rotating shaft;

[0007] An openable and closable opening and closing assembly, the opening and closing assembly comprising a plurality of split pieces, a plurality of support pieces, a first limiting piece and a sliding piece, the plurality of split pieces being arranged outside the cutting piece and forming a containing space capable of containing the cutting piece, the proximal end portion and the distal end portion of the split piece being provided with a support piece and connected with one end of the support piece, the other end of the support piece arranged at the distal end portion of the split piece being connected with the first limiting piece, the first limiting piece being configured to limit the movement of the support piece connected therewith, and the rotating shaft being rotatably arranged in the first limiting piece; the other end of the support piece arranged at the proximal end portion of the split piece being connected with the sliding piece, and the sliding piece being configured to slide along the axial direction of the rotating shaft;

[0008] The intermediate portion of the support piece between the two end portions has a certain flexibility, so that when the sliding piece slides along the axial direction of the rotating shaft, the intermediate portion can bend outward and drive the split piece to move outward to an open state in which the cutting piece is exposed, or the intermediate portion can drive the split piece to move to a closed state in which the cutting piece is contained.

[0009] In the process of blood vessel blockage dredging, the cutting catheter is very easy to scratch the inner wall of the blood vessel in the process of entering the blood vessel to reach the target position due to the need to enter the inside of the blood vessel. The cutting catheter of the present application is provided with an openable and closable assembly, so that the cutting member can be accommodated in the accommodation space formed by the split member. On the one hand, the contact between the cutting member and the blood vessel in the process of the cutting catheter entering the blood vessel to reach the target position is avoided, the risk of blood vessel injury is reduced, and the safety performance is good. On the other hand, when reaching the target position, the split member can be opened to expose the cutting member, so as to rotate and cut the blocked tissue, and the split member is abutted against the inner wall of the blood vessel to expand and protect the inner wall of the blood vessel, effectively preventing the inner wall of the blood vessel from being injured in the cutting process.

[0010] Preferably, when the split member is in the closed state, the middle part extends along the axial direction of the rotating shaft; when the split member is in the open state, the middle part is curved and substantially arc-shaped.

[0011] In some embodiments, the support sheet is a silica gel sheet with a skeleton embedded therein, and the skeleton is configured to maintain the shape of the silica gel sheet.

[0012] Further, the skeleton is a PA11 mesh.

[0013] Preferably, the extension direction of the split member is parallel to the axial direction of the rotating shaft, and when the split member is in the closed state, a plurality of the split members form a cylindrical structure. The cylindrical structure is provided on the one hand to facilitate the cutting catheter to enter the blood vessel and move in the blood vessel, thereby reducing the damage to the inner wall of the blood vessel caused by the movement; on the other hand, when the split member is opened, it can be fitted to the wall of the blood vessel, so as to squeeze the blood vessel without damaging the blood vessel, so that the blocked tissue near the blood vessel is embedded in the openable and closable assembly for easy cutting and removal.

[0014] In some preferred embodiments, the split member is two, and the two split members are arranged symmetrically along the axial direction of the rotating shaft.

[0015] Preferably, the outer diameter of the cylindrical structure is equal to the outer diameter of the tube body.

[0016] Further preferably, the proximal end of the split member is in contact with the distal end of the tube body.

[0017] Preferably, the sliding member is a sleeve movably arranged between the rotating shaft and the tube body, the proximal end of the sleeve protrudes from the tube body and is threadedly connected with a rotating member, the rotating member is coaxial with the sleeve and can rotate around the axis thereof, so that the sleeve has a tendency to move along the axial direction of the rotating shaft.

[0018] Further preferably, the sleeve is provided with a plurality of grooves extending along the axial direction of the rotating shaft, and the rotating shaft is rotatably arranged in a second limiting member provided with a plurality of protrusions penetrating through the grooves and connected to the pipe body, so that the movement of the rotating shaft in the axial direction is limited.

[0019] Preferably, the first limiting member is a bearing matched with the rotating shaft.

[0020] In some embodiments, the first limiting member has a ring structure, and an inner wall of the ring structure is provided with an annular groove, and the rotating shaft is provided with a protrusion matched with the groove and rotatably arranged in the groove.

[0021] Preferably, the cutting conduit further comprises a second limiting member arranged between the rotating shaft and the pipe body, and the second limiting member is configured to allow the rotating shaft to rotate only around the axial center line thereof.

[0022] Preferably, the cutting member is arranged between the first limiting member and the sliding member and has a plurality of groups arranged along the axial direction of the rotating shaft, and each group of cutting members comprises a plurality of blades distributed along the circumferential direction of the rotating shaft.

[0023] Further preferably, the blades extend outwardly and obliquely along the axial direction of the rotating shaft.

[0024] In some embodiments, the blades are made of stainless steel.

[0025] Preferably, the split member is provided with a developing coating.

[0026] A second object of the present application is to provide a cutting system comprising the cutting conduit as described above.

[0027] Preferably, the cutting system further comprises a one-way valve and an expansion pipe for connecting the one-way valve with the pipe body or the opening and closing assembly, the proximal end of the rotating shaft extends out of the one-way valve and can be connected with a driving device configured to rotate the rotating shaft around the axial center line thereof, and the side branch of the one-way valve is provided with a side branch pipe, and the distal end of the side branch pipe is connected with a three-way valve.

[0028] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:

[0029] The cutting conduit of the present application has a better cleaning effect on hardened and viscous vascular occlusive tissue by arranging the rotatable cutting assembly.

[0030] By setting the opening and closing assembly, the cutting member can be accommodated in the accommodating space formed by the split member, avoiding the contact of the cutting member with the blood vessel, reducing the risk of blood vessel injury, and having good safety performance; when the cutting of the blocked tissue is needed, the split member can be controlled to open, so that the cutting member is exposed, and the blood vessel is cut and removed, convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 It is a structure diagram of a cutting catheter in the present application, wherein the opening and closing assembly is in an open state;

[0033] Figure 2 It is a sectional view of a cutting catheter in the present application, wherein the opening and closing assembly is in an open state;

[0034] Figure 3 It is a structure diagram of a support sheet in an initial state of the present application;

[0035] Figure 4 It is a structure diagram of a support sheet in a curved state of the present application;

[0036] Figure 5 It is a structure diagram of a cutting system in the present application, wherein the opening and closing assembly is in a closed state;

[0037] Figure 6 It is Figure 5 An enlarged view of A;

[0038] Figure 7 It is a sectional view of a cutting system in the present application, wherein the opening and closing assembly is in a closed state;

[0039] Figure 8 It is a structure diagram of a cutting system in the present application, wherein the opening and closing assembly is in an open state;

[0040] 1, tube body;

[0041] 2, cutting assembly; 21, rotating shaft; 211, protrusion; 22, blade;

[0042] 3, opening and closing assembly; 31, split part; 32, first support piece; 321, distal end part of first support piece; 322, middle part of first support piece; 323, proximal end part of first support piece; 33, second support piece; 331, distal end part of second support piece; 332, middle part of second support piece; 333, proximal end part of second support piece; 34, first limiting part; 35, sliding part; 351, sliding groove; 36, rotating part;

[0043] 4, second limiting part;

[0044] 5, one-way valve;

[0045] 6, expansion tube;

[0046] 7, side branch tube;

[0047] 8, three-way valve. DETAILED DESCRIPTION

[0048] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0049] In the description of the embodiments of the present application, it is to be understood that the terms "distal", "proximal" and the like indicate the orientation or positional relationship defined by the cutting catheter in use, wherein the side close to the operator is the proximal end and the side away from the operator is the distal end. Only for the convenience of describing the embodiments of the present application and simplifying the description, it is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the embodiments of the present application.

[0050] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0051] In the embodiments of the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0052] The following disclosure provides many different embodiments, or examples, for implementing different structures of the embodiments of the present application. For the purpose of simplifying the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can refer to reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0053] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0054] Embodiment 1

[0055] A cutting system for unblocking the occluded tissue in a blood vessel, comprising a cutting catheter, referring to Figure 1 and Figure 2 The cutting catheter comprises a hollow tube 1, a cutting assembly 2 and an opening and closing assembly 3. The shape and size of the tube 1 can refer to the prior art, and the present application is not specifically limited.

[0056] The cutting assembly 2 comprises a rotating shaft 21 and a cutting member. The rotating shaft 21 is rotatably arranged in the tube 1 and the two ends thereof respectively extend out of the tube 1. The distal end portion of the rotating shaft 21 is provided with a cutting member for cutting the occluded tissue in the blood vessel. The proximal end portion of the rotating shaft 21 can be connected with a driving device, and the driving device is configured to rotate the rotating shaft 21 around its axis, so as to realize the rotary cutting of the cutting assembly 2. The driving device includes but is not limited to a rotating motor.

[0057] The cutting member has a plurality of groups arranged in sequence along the axis of the rotating shaft 21, and each group of the cutting member comprises a plurality of blades 22 distributed circumferentially along the rotating shaft 21. As a preferred, the cutting member has 2-6 groups, such as 2 groups, 3 groups, 4 groups, 5 groups or 6 groups. Each group of the cutting member comprises 3-8 blades 22, such as 3, 4, 5, 6, 7 or 8. In the present embodiment, the cutting member has 4 groups, and each group of the cutting member comprises 6.

[0058] Further, in order to have better cutting effect, the blade 22 extends outwardly along the axial direction of the rotating shaft 21. The blade 22 is preferably made of stainless steel, for example, 316L stainless steel.

[0059] Further, the size of the blade 22 is not too large, and the distance from the outermost side of the blade 22 to the axial line of the rotating shaft 21 is preferably not greater than the inner radius of the pipe body 1, so that the cutting assembly 2 can easily enter the blood vessel, and the situation that the blade 22 is too large to scratch the inner wall of the blood vessel is reduced. The distance between two adjacent blades 22 can be set according to actual conditions, and the present application does not make specific limitation.

[0060] The opening and closing assembly 3 comprises split pieces 31, support pieces, first limiting pieces 34 and sliding pieces 35.

[0061] The split pieces 31 are multiple, and the multiple split pieces 31 surround the cutting piece outside and form a containing space capable of containing the cutting piece. As preferred, the multiple split pieces 31 form a cylindrical structure. By containing the cutting piece in the cylindrical structure, the contact between the cutting piece and the inner wall of the blood vessel during the process of entering the blood vessel and reaching the blockage position can be avoided, so that the cutting piece scratches the inner wall of the blood vessel. In addition, the surface of the cylindrical structure is smooth, which is more convenient for the cutting catheter to enter the blood vessel, and can also reduce the damage to the fragile blood vessel wall caused by pulling out the cutting catheter from the blood vessel.

[0062] Further, the outer diameter and the inner diameter of the cylindrical structure are equal to the outer diameter and the inner diameter of the pipe body 1 respectively, the proximal end of the cylindrical structure is in contact with the distal end of the pipe body 1, and the cylindrical structure and the pipe body 1 constitute the catheter.

[0063] The extension direction of the split piece 31 is parallel to the axial direction of the rotating shaft 21, and as preferred, the split piece 31 is 2-4. In the embodiment, the split piece 31 is two, and the two split pieces 31 are arranged symmetrically along the axial direction of the rotating shaft 21.

[0064] Further, the split piece 31 is provided with a developing coating, and the developing coating can be a mixed coating of barium sulfate and platinum gold. After the developing coating is solidified on the outer surface of the split piece 31 by spraying process, a hydrophilic coating is used as isolation, which plays a self-lubricating role.

[0065] In order to better cut the blockage tissue when the cutting piece reaches the vicinity of the blockage tissue, the proximal end and the distal end of the split piece 31 are respectively provided with support pieces. By deforming the support pieces, the split piece 31 moves outwardly, so that a gap is formed between the two adjacent split pieces 31, the cutting piece is exposed, and the split piece 31 extrudes the blockage tissue in the process of moving outwardly, the blockage tissue enters the vicinity of the cutting piece from the gap, and the cutting piece rotates to cut the blockage tissue.

[0066] The proximal end and the distal end of the split piece 31 are respectively provided with a first support sheet 32 and a second support sheet 33. The first support sheet distal end portion 321 is fixedly connected with the distal end of the split piece 31, the first support sheet proximal end portion 323 is fixedly connected with the first limiting piece 34, and the first limiting piece 34 is configured to limit the movement of the first support sheet 32, and the rotating shaft 21 is rotatably arranged in the first limiting piece 34. Specifically, the first support sheet distal end portion 321 and the distal end of the split piece 31, and the first support sheet proximal end portion 323 and the first limiting piece 34 can be bonded by an adhesive or welded. The second support sheet distal end portion 331 is fixedly connected with the proximal end of the split piece 31, the second support sheet proximal end portion 333 is fixedly connected with the sliding piece 35, and the sliding piece 35 is configured to slide along the axial direction of the rotating shaft 21. Specifically, the second support sheet distal end portion 331 and the proximal end of the split piece 31, and the second support sheet proximal end portion 333 and the sliding piece 35 can also be bonded by an adhesive or welded. The first support sheet intermediate portion 322 located between the first support sheet distal end portion 321 and the first support sheet proximal end portion 323, and the second support sheet intermediate portion 332 located between the second support sheet distal end portion 331 and the second support sheet proximal end portion 333 both have a certain flexibility, so that when the sliding piece 35 slides along the axial direction of the rotating shaft 21, the first support sheet intermediate portion 322 and the second support sheet intermediate portion 332 can respectively bend outward, and drive the split piece 31 to move outward to an open state in which the cutting piece is exposed, or the first support sheet intermediate portion 322 and the second support sheet intermediate portion 332 can respectively return to the initial state, and drive the split piece 31 to move to a closed state in which the cutting piece is accommodated.

[0067] Take the second support sheet 33 as an example, the second support sheet 33 is matched with the split piece 31, as shown in Figure 3 , in the initial state, the plurality of second support sheets 33 form a cylindrical structure; as shown in Figure 4 , in the bent state, the plurality of second support sheets 33 form a petal-shaped structure.

[0068] Specifically, when the second support sheet 33 is in the initial state, the second support sheet intermediate portion 332 extends along the axial direction of the rotating shaft 21, and the split piece 31 is in the closed state under the action of the second support sheet 33 (as shown in Figure 5 、 Figure 6 and Figure 7 ); when the second support sheet 33 is in the bent state, the distal end of the second support sheet intermediate portion 332 bends outward and the second support sheet intermediate portion 332 is approximately arc-shaped, and the split piece 31 is in the open state under the action of the second support sheet 33 (as shown in Figure 8 ).

[0069] Furthermore, the second support sheet 33 is a silicone sheet with an embedded skeleton (not shown in the figure), the skeleton being configured to maintain the shape of the silicone sheet. Preferably, the skeleton is a PA11 mesh.

[0070] The shape and structure of the first support piece 32 are the same as those of the second support piece 33, and will not be described in detail here.

[0071] The sliding member 35 is a sleeve movably disposed between the rotating shaft 21 and the tube body 1, and the distal end of the sleeve is fixedly connected to the proximal portion 333 of the second support plate. When the sleeve moves in the first direction ( Figure 5 (In the direction of the middle arrow), the split piece 31 tends to move in the first direction under the action of the second support piece 33. Under the action of the first limiting piece 34, the movement of the split piece 31 in the first direction is restricted. The force applied to both ends of the first support piece 32 causes the middle part 322 of the first support piece to bend outward, thereby causing the split piece 31 to move outward to the open state.

[0072] See Figure 5 , Figure 7 and Figure 8 The proximal end of the sleeve extends out of the pipe body 1 and is threadedly connected to a rotating member 36. The rotating member 36 is configured to be coaxial with the sleeve and can rotate about its axis, so that the sleeve has a tendency to move axially along the rotating shaft 21. Furthermore, the sleeve is rotatably mounted on the pipe body 1 and is coaxial with the pipe body 1.

[0073] The sleeve has a sliding groove 351 extending axially along the rotating shaft 21. The sliding groove 351 has multiple grooves and is distributed around the axis of the rotating shaft 21.

[0074] The first limiting member 34 is preferably a bearing adapted to and coaxial with the rotating shaft 21. Further, the first limiting member 34 has an annular structure, with an annular groove formed on the inner wall of the annular structure. The rotating shaft 21 has a protrusion 211 adapted to the groove, and the protrusion 211 is rotatably disposed within the groove. Of course, the first limiting member 34 can also be a bearing.

[0075] To ensure that the rotating shaft 21 can only rotate around its axis, the cutting guide also includes a second limiting member 4 disposed between the rotating shaft 21 and the tube body 1. The second limiting member 4 is preferably a rotating shaft and is coaxial with the rotating shaft 21 and the tube body 1.

[0076] Specifically, the second limiting member 4 has multiple protrusions, which pass through the slide groove 351 and are fixedly connected to the tube body 1, thereby restricting the axial movement of the rotating shaft 21. The connection method between the second limiting member 4 and the rotating shaft 21 is the same as that between the first limiting member 34 and the rotating shaft 21, and will not be repeated here.

[0077] The cutting system further comprises a one-way valve 5 and an expansion tube 6, wherein a side branch of the one-way valve 5 is provided with a side branch tube 7, and a terminal end of the side branch tube 7 is connected with a three-way valve 8.

[0078] The one-way valve 5, the expansion tube 6, the side branch tube 7 and the three-way valve 8 can refer to the prior art.

[0079] The rotating member 36 is rotatably arranged on the expansion tube 6, and the proximal end portion of the sliding member 35 is arranged on the expansion tube 6 and is in sliding connection with the expansion tube 6. The proximal end portion of the rotating shaft 21 extends out of the one-way valve 5 and can be connected with a driving device.

[0080] A method for using the cutting system, comprising the following steps:

[0081] (1) The cutting catheter enters the human body blood vessel through a guide wire, and the occlusion position is confirmed through the developing coating of the split member 31. When the occlusion position is reached, the guide wire is pulled out;

[0082] (2) The driving device is inserted into the one-way valve 5, and the driving rotating shaft 21 is connected with the proximal end portion of the rotating shaft 21;

[0083] (3) The rotating member 36 is rotated to make the sliding member 35 move in the first direction, and the first support piece 32 and the second support piece 33 are bent outward to the bent state under the force, the split member 31 is switched from the closed state to the open state, and the split member 31 extrudes the occluded tissue to make the occluded tissue deform into the gap formed between the adjacent two split members 31;

[0084] (4) The driving device is started to rotate the rotating shaft 21 to cut the occluded tissue;

[0085] (5) After the cutting is completed, the driving device is turned off, the rotating member 36 is reversely rotated to make the first support piece 32 and the second support piece 33 return to the initial state, the split member 31 is switched to the closed state, and the cutting catheter is withdrawn.

[0086] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A cutting catheter, characterized by: The cutting catheter comprises a hollow tube body; The cutting assembly comprises a rotating shaft rotatably arranged in the tube body and a cutting member, a distal end portion of the rotating shaft extends out of the tube body, and the cutting member is arranged on the distal end portion of the rotating shaft; The opening and closing assembly comprises a plurality of split members, a plurality of support pieces, a first limiting member and a sliding member; The plurality of split members are arranged outside the cutting member and form a containing space capable of containing the cutting member, the extension direction of the split members is parallel to the axial direction of the rotating shaft, the proximal end portion and the distal end portion of the split members are respectively provided with support pieces and connected to one end of the support pieces; The other end of the support piece arranged at the distal end portion of the split member is connected to the first limiting member, the first limiting member is configured to limit the movement of the support piece connected thereto, and the rotating shaft is rotatably arranged in the first limiting member; The other end of the support piece arranged at the proximal end portion of the split member is connected to the sliding member, and the sliding member is configured to slide along the axial direction of the rotating shaft; The middle portion of the support piece between the two end portions has a certain flexibility, so that when the sliding member slides along the axial direction of the rotating shaft, the middle portion can bend outward and drive the split member to move outward to an open state in which the cutting member is exposed, or the middle portion can drive the split member to move to a closed state in which the cutting member is contained, the support piece is a silica gel piece with a skeleton embedded therein, and the skeleton is configured to maintain the shape of the silica gel piece; When the split members are in the closed state, the plurality of split members form a cylindrical structure.

2. The cutting guide tube of claim 1, wherein: When the split members are in the closed state, the middle portion extends along the axial direction of the rotating shaft; When the split members are in the open state, the middle portion is bent and substantially arc-shaped.

3. The cutting guide tube of claim 1, wherein: The skeleton is a PA11 mesh.

4. The cutting guide tube of claim 1, wherein: The split members are two, and the two split members are arranged symmetrically along the axial direction of the rotating shaft; and / or The outer diameter of the cylindrical structure is equal to the outer diameter of the tube body.

5. The cutting guide tube of claim 1, wherein: The sliding member is a sleeve movably arranged between the rotating shaft and the tube body, the proximal end portion of the sleeve extends out of the tube body and is threadedly connected with a rotating member, the rotating member is coaxial with the sleeve and can rotate around the axis thereof, so that the sleeve has a tendency to move along the axial direction of the rotating shaft.

6. The cutting guide tube of claim 5, wherein: The sleeve is provided with a plurality of sliding grooves extending along the axial direction of the rotating shaft and distributed around the axis of the rotating shaft; the cutting catheter further comprises a second limiting member, the rotating shaft is rotatably arranged in the second limiting member, the second limiting member has a plurality of convex portions, the plurality of convex portions respectively pass through the sliding grooves and are connected to the tube body, so that the movement of the rotating shaft in the axial direction is limited.

7. The cutting guide tube of claim 1, wherein: The first limiting member is a bearing matched with the rotating shaft; and / or The cutting catheter further comprises a second limiting member arranged between the rotating shaft and the tube body, the second limiting member is configured to allow the rotating shaft to rotate only around the axis thereof.

8. The cutting guide tube of claim 1, wherein: The cutting member is located between the first limiting member and the sliding member and has a plurality of groups arranged along the axial direction of the rotating shaft, each group of cutting members comprises a plurality of blades distributed along the circumferential direction of the rotating shaft.

9. The cutting guide according to claim 8, wherein: The blade extends outwardly along an axial direction of the rotating shaft; and / or The blade is made of stainless steel.

10. The cutting guide tube of claim 1, wherein: The split part is provided with a developing coating.

11. A cutting system characterized by: The cutting system comprises the cutting catheter according to any one of claims 1 to 10.

12. The cutting system of claim 11, wherein: The cutting system further comprises a one-way valve and an expansion tube for connecting the one-way valve with a pipe body or an opening and closing assembly, a proximal end of the rotating shaft extends out of the one-way valve and can be connected with a driving device configured to rotate the rotating shaft around an axial line thereof, a side branch of the one-way valve is provided with a side branch tube, and a distal end of the side branch tube is connected with a three-way valve.

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