CN113081185B

CN113081185B - Thrombus cutting system

Info

Publication number: CN113081185B
Application number: CN202110379521.2A
Authority: CN
Inventors: 于波; 张羽; 候静波; 贾海波; 代建南; 赵晨
Original assignee: Hengyi Beijing Medical Technology Co ltd; Harbin Medical University
Current assignee: Hengyi Beijing Medical Technology Co ltd; Harbin Medical University
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2022-05-10
Anticipated expiration: 2041-04-08
Also published as: CN113081185A

Abstract

The application provides a thrombus cutting system, including conveyer pipe, storage tube and cutting module. The containing pipe is inserted in the conveying pipe and is in sliding fit with the conveying pipe in the extending direction of the conveying pipe. The cutting module comprises a blade and a balloon, and the blade is connected with the balloon; the cutting module is provided with a first position and a second position which are mutually switched, and when the cutting module is positioned at the first position, the saccule and the blade are both positioned in the accommodating tube; when being in the second position, the distal end of accomodating the pipe is all stretched out to sacculus and blade, and the sacculus is used for laminating with the vascular wall after the inflation, and the blade can be along the radial outside motion of accomodating the pipe when the sacculus inflation, and the cutting edge of blade orientation accomodates pipe place one side to make the cutting edge can accomodate the pipe in the drive and cut the thrombus when cutting module moves along the direction of withdrawing from the blood vessel. The thrombus cutting operation is convenient and reliable, the safety is high, and the treatment effect is good.

Description

Thrombus cutting system

Technical Field

The invention relates to the field of medical equipment, in particular to a thrombus cutting system.

Background

There are two systems within normal human blood, one called the coagulation system and the other called the fibrinolysis system. The blood coagulation system mainly produces thrombi and is used for treating vascular injury parts. The fibrinolytic system is primarily directed against thrombi and is used to dissolve unwanted thrombi. When the fibrinolysis is destroyed or the fibrinolysis is insufficient due to the age of a patient, thrombus is easy to generate in vivo blood vessels, when the thrombus passes through a relatively thick blood vessel, the thrombus can pass through and flow towards other blood vessels along the blood flow direction, but when the thrombus passes through a relatively small blood vessel or a relatively bent blood vessel, the thrombus is easy to accumulate in the blood vessel and does not flow along with the blood, and finally becomes old thrombus. These old thrombi obstruct blood flow of blood vessels, affect hemodynamics, and in severe cases, the blood vessels can be completely blocked, so that the blood vessels of patients are ischemic at the far ends, and the health of the patients is not facilitated. At present, three main ways of treating thrombus exist, and the first way is thrombolytic drug therapy; the second is a thrombus taking bracket; the third is a thrombus aspiration catheter.

The inventor researches and discovers that the existing equipment for treating old thrombus has the following defects:

has poor treatment effect on old thrombus.

Disclosure of Invention

The purpose of the present invention is to provide a thrombus cutting system that can improve the therapeutic effect of old thrombus and has high surgical safety.

The embodiment of the invention is realized by the following steps:

in a first aspect, the present invention provides a thrombus cutting system comprising:

a delivery pipe;

the storage pipe is inserted in the conveying pipe and is in sliding fit with the conveying pipe in the extending direction of the conveying pipe;

the cutting module comprises a blade and a balloon, and the blade is connected with the balloon; the cutting module is provided with a first position and a second position which are mutually switched, and when the cutting module is positioned at the first position, the saccule and the blade are both positioned in the accommodating tube; when being in the second position, the distal end of accomodating the pipe is all stretched out to sacculus and blade, and the sacculus is used for laminating with the vascular wall after the inflation, and the blade can be along the radial outside motion of accomodating the pipe when the sacculus inflation, and the cutting edge of blade orientation accomodates pipe place one side to make the cutting edge can accomodate the pipe in the drive and cut the thrombus when cutting module moves along the direction of withdrawing from the blood vessel.

In an alternative embodiment, the balloon is configured as a self-expanding balloon.

In an alternative embodiment, the balloon comprises a first reducing section, an equal-diameter section and a second reducing section which are connected in sequence after being inflated, wherein the inner diameter of the first reducing section gradually increases from the first end part of the balloon to the middle part, the inner diameter of the second reducing section gradually increases from the second end part of the balloon to the middle part, and the first end part and the second end part are arranged oppositely; the first diameter-changing section is connected with the containing pipe through a traction wire, and the traction wire is in sliding fit with the containing pipe along the extending direction of the containing pipe so as to drive the balloon to be switched between a first position and a second position; the blade is connected with first reducing section, and the blade is at the radial outside of sacculus in the direction of the equal diameter section of not protrusion, the equal diameter section is used for with the vascular wall laminating.

In an alternative embodiment, the plurality of blades are arranged, and the plurality of blades are connected with the first variable-diameter section and are arranged in the circumferential direction of the balloon; when the cutting module is in the second position, the plurality of cutting edges of the plurality of blades collectively form an annular cutting edge around the balloon, and the plurality of blades and the first reducer section collectively define a receiving groove for receiving thrombus.

In an alternative embodiment, adjacent blade edges partially overlap in the circumferential direction of the balloon when the cutting module is in the second position.

In an alternative embodiment, each blade has a first fitting side and a second fitting side which are oppositely arranged in the circumferential direction of the balloon, and the first fitting side and the second fitting side are provided as mutually matched inclined surfaces; when the cutting module is in the second position, adjacent blades are butted by the corresponding first and second assembly sides.

In an alternative embodiment, each blade is provided as an arcuate blade.

In an alternative embodiment, the inner wall of the distal end of the delivery tube is provided with a conical surface, the diameter of which gradually increases in a direction from the proximal end to the distal end of the delivery tube; the conical surface is used for abutting against the blades after the cutting edge cuts thrombus so as to ensure that the blades are inserted into the far end of the conveying pipe.

In an alternative embodiment, the conical surface is provided with an annular sealing structure, and the annular sealing structure is used for abutting against the outer side surface of the blade so as to seal a gap between the blade and the conical surface.

In an alternative embodiment, a developing member is provided on at least one of the transport tube and the storage tube.

The embodiment of the invention has the beneficial effects that:

to sum up, the embodiment provides a thrombus cutting system, including conveyer pipe, storage tube and cutting module, cutting module includes blade and sacculus, and cutting module has the first position that is located storage tube and stretches out the second position of storing the pipe distal end, and storage tube is located the conveyer pipe. When the old thrombus cutting operation is carried out, the thrombus cutting system can be conveyed to the focus position by means of instruments such as an endoscope and the like.

When the initial state is set, the far end of the containing pipe is positioned in the conveying pipe, and the cutting module is positioned at the first position. When the delivery pipe is placed at the position where the thrombus is accumulated in the blood vessel, the delivery pipe does not pass through the thrombus, then the accommodating pipe is operated to move relative to the delivery pipe, the distal end of the accommodating pipe moves towards the distal end of the delivery pipe and extends out of the delivery pipe, and the distal end of the accommodating pipe passes through the thrombus, namely the distal end of the accommodating pipe is positioned at one side of the thrombus far away from the delivery pipe. Then, release the cutting module from accomodating the pipe, make the cutting module be in the second position to, make the sacculus inflation, the sacculus laminating after the inflation is on the vascular wall, and be sealed cooperation with the vascular wall. The blade is from inside to outside motion under the drive of sacculus, also the blade is close to the vascular wall motion, and at this moment, the position adjustment of cutting module is accomplished, can carry out thrombus cutting operation. During cutting, the accommodating tube and the cutting module move together along the direction of withdrawing from the blood vessel, namely the accommodating tube and the cutting module move along the direction of the far end to the near end of the conveying tube, the cutting edge of the blade contacts with thrombus firstly, then the thrombus is cut, the cut thrombus is driven by the saccule and the blade to move close to the conveying tube, and finally the conveying tube, the accommodating tube and the cutting module withdraw from the blood vessel together, and the cut thrombus is taken out together to complete the thrombus cutting operation. The thrombectomy safety is high, the risk is low, the thrombectomy is thorough, the operation success rate is high, and the treatment effect is good. And before cutting the thrombus, the saccule seals the blood vessel, so that the thrombus and tissue fluid are difficult to flow out from the far end of the saccule, the cut thrombus is difficult to remain in vivo, and the thrombus is cut more thoroughly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic configuration diagram of a first state of a thrombus cutting system according to an embodiment of the present invention;

FIG. 2 is a schematic configuration diagram of a second state of the thrombus cutting system according to the embodiment of the present invention;

FIG. 3 is a schematic configuration diagram showing a third state of the thrombus cutting system according to the embodiment of the present invention;

FIG. 4 is a schematic structural view showing a fourth state of the thrombus cutting system according to the embodiment of the present invention;

FIG. 5 is a structural view showing a fifth state of the thrombus cutting system according to the embodiment of the present invention;

FIG. 6 is a schematic view of a blade according to an embodiment of the present invention;

FIG. 7 is a schematic view of a plurality of blades according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a modified structure of a plurality of blades according to an embodiment of the present invention.

Icon:

001-blood vessel; 002-old thrombus; 100-a conveying pipe; 200-a storage tube; 300-a cutting module; 310-a blade; 311-a first side; 312-a second side; 3121-a first inclined plane; 313-a blade edge; 314-a second bevel; 320-balloon; 321-a first reducer section; 322-constant diameter section; 323-a second reducer section; 330-a traction wire; 340-accommodating grooves; 400-developing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 8, the present embodiment provides a thrombus cutting system, which can cut old thrombus 002, and has high cutting safety, complete cutting and good therapeutic effect.

In the following embodiments, it should be understood by those skilled in the art that the thrombectomy system is operated with its front end being placed in the human body and its rear end being located outside the human body for the operator to operate. It is contemplated that the end of the thrombectomy system and its components proximal to the anterior end is distal and the end proximal to the posterior end is proximal.

Referring to fig. 1 to 3, in the present embodiment, the thrombus cutting system includes a delivery tube 100, a receiving tube 200, and a cutting module 300. The receiving tube 200 is inserted into the conveying tube 100 and is slidably engaged with the conveying tube 100 in the extending direction of the conveying tube 100. The cutting module 300 comprises a blade 310 and a balloon 320, wherein the blade 310 is connected with the balloon 320; the cutting module 300 has a first position and a second position switched with each other, and when in the first position, the balloon 320 and the blade 310 are both located in the receiving tube 200; when in the second position, the balloon 320 and the blade 310 both extend out of the distal end of the receiving tube 200, the balloon 320 is used for being attached to the wall of the blood vessel 001 after being expanded, the blade 310 can move outwards along the radial direction of the receiving tube 200 when the balloon 320 is expanded, and the cutting edge 313 of the blade 310 faces to the side of the receiving tube 200, so that the cutting edge 313 can cut thrombus when the receiving tube 200 and the cutting module 300 are driven to move in the direction of exiting the blood vessel 001.

The thrombus cutting system provided by the embodiment comprises a delivery tube 100, a receiving tube 200 and a cutting module 300, wherein the cutting module 300 comprises a blade 310 and a balloon 320, the cutting module 300 has a first position located in the receiving tube 200 and a second position extending out of the distal end of the receiving tube 200, and the cutting module 300 can be switched between the first position and the second position. The receiving tube 200 is located in the conveying tube 100 and can slide relative to the conveying tube 100 to drive the cutting module 300 to slide. When the old thrombus 002 cutting operation is performed, the thrombus cutting system can be conveyed to the focus position by means of instruments such as an endoscope and the like.

Referring to fig. 1-5, in the initial state, the distal end of the receiving tube 200 is located in the delivery tube 100, and the cutting module 300 is at the first position. When the delivery tube 100 is placed in the blood vessel 001 at the position where the thrombus is left, the delivery tube 100 does not pass through the thrombus, that is, is located on the proximal side of the thrombus, and then, the delivery tube 100 is kept at the constant position, the storage tube 200 is operated to move relative to the delivery tube 100, the distal end of the storage tube 200 moves toward the distal end of the delivery tube 100 and extends out of the delivery tube 100, and the distal end of the storage tube 200 passes beyond the thrombus, that is, the distal end of the storage tube 200 is located on the side of the thrombus away from the delivery tube 100. It should be understood that the receiving tube 200 may be disposed beyond the length of the thrombus as needed. Then, the cutting module 300 is pushed out from the accommodating tube 200, so that the cutting module 300 is located at the second position, at this time, the balloon 320 is not bound by the wall of the accommodating tube 200, the balloon 320 can be expanded, and the expanded balloon 320 is attached to the wall of the blood vessel 001 and is in sealing fit with the wall of the blood vessel 001.

Meanwhile, the blade 310 is driven by the balloon 320 to move from inside to outside, that is, the blade 310 moves close to the wall of the blood vessel 001, and at this time, the position adjustment of the cutting module 300 is completed, so that the thrombus cutting operation can be performed. During cutting, the accommodating tube 200 and the cutting module 300 move together along the direction of exiting the blood vessel 001, that is, the accommodating tube 200 and the cutting module 300 move along the direction from the distal end to the proximal end of the conveying tube 100, the cutting edge 313 of the blade 310 contacts the thrombus first, then cuts the thrombus, the cut thrombus moves close to the conveying tube 100 under the driving of the balloon 320 and the blade 310, and finally the conveying tube 100, the accommodating tube 200 and the cutting module 300 exit from the blood vessel 001 together and take out the cut thrombus together, thereby completing the thrombus cutting operation. The thrombectomy is high in safety, low in risk, thorough in thrombectomy, high in operation success rate and good in treatment effect. In addition, before cutting the thrombus, the saccule 320 seals the blood vessel 001, so that the thrombus and tissue fluid are not easy to flow out from the far end of the saccule 320, the cut thrombus is not easy to remain in the body, and the operation sequelae are not easy to cause.

In this embodiment, optionally, the inner pipe wall of the distal end of the delivery pipe 100 is provided with a conical surface, and the conical surface may be a conical surface. The diameter of the conical surface increases gradually in a direction from the proximal end to the distal end of the delivery tube 100. After the blade 310 cuts the thrombus, the blade 310 can enter the region surrounded by the tapered surface from the distal side of the tapered surface and contact the tapered surface, thereby trapping the thrombus in the delivery tube 100.

Furthermore, an annular sealing structure is arranged on the conical surface, and after the blade 310 enters the conical surface, the blade 310 can deform inwards under the blocking of the conical surface when moving continuously in the direction of exiting the blood vessel 001, so that the outer wall of the blade 310 is in contact with the annular sealing structure, the sealing performance is improved, and tissue fluid is not easy to enter the conveying pipe 100.

Further, be equipped with the spacing portion of annular in the conveyer pipe 100, the spacing portion of annular compares the near-end setting that the conical surface is close to conveyer pipe 100, and the spacing portion of annular is equipped with the coaxial through-hole with conveyer pipe 100, and the storage tube 200 passes the through-hole. The annular limiting portion is dynamically and hermetically connected with the accommodating tube 200, that is, when the accommodating tube 200 slides relative to the conveying tube 100, the accommodating tube 200 and the annular limiting portion generate relative movement, and the accommodating tube 200 and the annular limiting portion are always hermetically connected. In this way, when the cut thrombus is positioned in the delivery pipe 100, the thrombus can be limited among the annular limiting part, the blade 310 and the balloon 320, and the thrombus can be taken out conveniently.

Optionally, the tube wall of the delivery tube 100 is provided with a visualization member 400, and the visualization member 400 is located at the distal end of the delivery tube 100 and can be visualized under set conditions to facilitate viewing of the position of the delivery tube 100 in the blood vessel 001. The development member 400 includes, but is not limited to, one or more of a platinum iridium alloy development ring, a barium sulfate development point.

In this embodiment, optionally, the tube wall of the storage tube 200 is provided with a developing member 400, and the developing member 400 is located at the distal end of the storage tube 200 and can develop under a set condition, so as to facilitate observation of the position of the storage tube 200 in the blood vessel 001.

In this embodiment, optionally, the cutting module 300 further includes a pull wire 330, and the pull wire 330 is disposed through the receiving tube 200 and slidably engaged with the receiving tube 200 in the extending direction of the receiving tube 200. The distal end of the traction wire 330 is connected to the proximal end of the balloon 320, and can drive the balloon 320 to reciprocate in the receiving tube 200, so that the balloon 320 extends out of the distal end of the receiving tube 200 or is retracted into the receiving tube 200. The pull wire 330 may be a stainless steel wire or the like.

Alternatively, balloon 320 is configured as a self-expanding balloon 320, i.e., balloon 320 cannot expand when balloon 320 is disposed within receiving tube 200 because the wall of receiving tube 200 constrains balloon 320. When the balloon 320 is protruded from the distal end of the receiving tube 200 by being pushed by the pulling wire 330, the balloon 320 is expanded by its own internal force since the tube wall of the receiving tube 200 loses the constraint of the balloon 320, that is, the balloon 320 is expanded by its own internal force.

For example, a memory alloy wire is embedded inside the balloon 320, and the material includes, but is not limited to, nitinol, gold-cadmium alloy, silver-cadmium alloy, copper-zinc-aluminum alloy, copper-zinc-tin alloy, copper-zinc-silicon alloy, copper-tin alloy, and the like.

Obviously, in other embodiments, the balloon 320 may be configured to be a passive expansion structure, that is, the balloon 320 will not automatically expand even after extending out of the receiving tube 200, and the balloon 320 may be passively opened by filling the inside of the balloon 320 with a fluid such as gas or liquid. At this time, a channel may be provided inside the pull wire 330, and fluid may be input to the inside of the balloon 320 through the channel inside the pull wire 330.

Referring to fig. 3, optionally, after the balloon 320 is expanded, the balloon 320 includes a first reducing section 321, a constant diameter section 322, and a second reducing section 323, which are connected in sequence, wherein an inner diameter of the first reducing section 321 gradually increases from a first end portion of the balloon 320 to a middle portion, an inner diameter of the second reducing section 323 gradually increases from a second end portion of the balloon 320 to the middle portion, and the first end portion and the second end portion are arranged opposite to each other, that is, the balloon 320 is expanded to form a shuttle structure with two small ends and a large middle portion. The proximal end of the first variable-diameter section 321 is connected with the accommodating tube 200 through a pull wire 330, and the pull wire 330 is in sliding fit with the accommodating tube 200 along the extending direction of the accommodating tube 200 to drive the balloon 320 to switch between the first position and the second position; the blade 310 is connected to the first variable diameter section 321, and the blade 310 does not protrude in a radial outward direction of the balloon 320 into the constant diameter section 322, and the constant diameter section 322 is used for being attached to the wall of the blood vessel 001. Thus, after the balloon 320 is inflated, the blade 310 does not obstruct the attachment of the balloon 320 to the wall of the blood vessel 001, the balloon 320 can be perfectly attached to the wall of the blood vessel 001, and meanwhile, the balloon 320 does not affect the cutting of thrombus by the blade 310. The balloon 320 is in a fusiform shape, and the contact area between the balloon 320 and the wall of the blood vessel 001 is reduced while the balloon 320 is in sealing fit with the wall of the blood vessel 001, so that the friction force generated between the balloon 320 and the blood vessel 001 when the balloon slides relative to the blood vessel 001 is reduced, and the operation is smoother.

Referring to fig. 6, optionally, the blade 310 includes a first side 311 and a second side 312 opposite to each other, the first side 311 is a distal side, the second side 312 is a proximal side, and the cutting edge 313 is disposed on the second side 312. First side 311 is connected with first reducing section 321 of sacculus 320, and blade 310 extends along the axis of constant diameter section 322, and the lateral surface of blade 310 is located the outer peripheral face of constant diameter section 322 and is located the face of cylinder, so, blade 310 can be laminated the motion in blood vessel 001 wall to blood vessel 001 wall, is difficult for haring blood vessel 001 wall when cutting the thrombus, and blade 310 laminates blood vessel 001 wall to go on, and the thrombus cutting is more thorough. On the second side 312, a first inclined surface 3121 is provided, and an intersection line of the first inclined surface 3121 and the outer side of the blade 310 is the cutting edge 313. The first inclined surface 3121 is located the inboard of blade 310, and the laminating of the outside of blade 310 and blood vessel 001 wall is inseparabler, and the cutting effect is better, and the thrombectomy is more thorough.

Referring to fig. 7 or 8, further, the number of the blades 310 is multiple, the multiple blades 310 are uniformly arranged in the circumferential direction of the balloon 320, and after the balloon 320 is inflated, the multiple blades 310 jointly form an annular knife body, and the cutting edges 313 of the multiple blades 310 jointly form an annular cutting edge 313. That is, after the sacculus 320 is inflated, under the drive of the sacculus 320, the plurality of blades 310 are all expanded from inside to outside, and the adjacent blades 310 are partially overlapped or the adjacent blades 310 are butted in the circumferential direction of the sacculus 320, so that an annular cutter body is formed, the thrombus formed on the wall of the blood vessel 001 can be cut in the circumferential direction, the cutting area is large, and the thrombus is cut more thoroughly.

It should be understood that each blade 310 is fixedly connected with the balloon 320, when the balloon 320 is in a contracted state, the plurality of blades 310 are also in a contracted state, the overlapping area of the plurality of blades 310 is the largest, as the balloon 320 expands, the plurality of blades 310 move from inside to outside, the overlapping part of adjacent blades 310 gradually decreases, the overlapping area gradually decreases, after the balloon 320 is completely expanded, the blades 310 also stop moving, the plurality of blades 310 jointly form an annular knife body, and the cutting edges 313 of the plurality of blades 310 jointly form an annular cutting edge 313, that is, there is no space between adjacent cutting edges 313, so as to satisfy circular cutting.

Meanwhile, when the balloon 320 is inflated, an accommodating groove 340 for accommodating thrombus is defined between the annular cutter body and the first variable-diameter section 321 of the balloon 320, and the accommodating groove 340 is an annular groove. After thrombectomy, the cut thrombus is located in the receiving channel 340 and can exit the vessel 001 with the balloon 320 and the blades 310.

Referring to fig. 7 and 8, it should be understood that the annular cutter body formed by the plurality of blades 310 may be a cylindrical body, which has a high degree of matching with the lumen of the blood vessel 001, and is beneficial to travel in the blood vessel 001 and thrombus cutting. Correspondingly, each blade 310 is configured as an arcuate segment. Obviously, the annular cutter body formed by the plurality of blades 310 is not limited to a cylindrical barrel.

Further, each blade 310 has a first fitting side surface and a second fitting side surface oppositely arranged in the circumferential direction of the balloon 320, and the first fitting side surface and the second fitting side surface are provided as a second inclined surface 314 which is engaged with each other; when the cutting module 300 is located at the second position, the adjacent blades 310 are butted with each other through the corresponding first assembling side and second assembling side, so that when the plurality of blades 310 form an annular cutter body, the integrity of the annular cutter body is better, and the cutting effect is better.

In other embodiments, a handle may be provided at the front end of the delivery tube 100, and the handle may be made of one or more of PMMA and PC.

It should be noted that the blades 310 and the balloon 320 may be fixedly connected by adhesion.

The thrombus cutting system provided by the embodiment can cut old thrombus 002, and has a good treatment effect.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thrombus cutting system, comprising:

a delivery pipe;

the accommodating pipe is inserted in the conveying pipe and is in sliding fit with the conveying pipe in the extending direction of the conveying pipe;

and a cutting module comprising a blade and a balloon, the blade being connected with the balloon; the cutting module is provided with a first position and a second position which are mutually switched, and when the cutting module is positioned at the first position, the balloon and the blade are positioned in the accommodating pipe; when the cutting module is positioned at the second position, the balloon and the blade extend out of the far end of the accommodating tube, the balloon is used for being attached to a blood vessel wall after being expanded, the blade can move outwards along the radial direction of the accommodating tube when the balloon is expanded, and the cutting edge of the blade faces one side of the accommodating tube, so that the cutting edge can cut thrombus when driving the accommodating tube and the cutting module to move along the direction of withdrawing the blood vessel;

the balloon comprises a first reducing section, an equal-diameter section and a second reducing section which are connected in sequence after being inflated, wherein the inner diameter of the first reducing section is gradually increased in the direction from the first end part of the balloon to the middle part, the inner diameter of the second reducing section is gradually increased in the direction from the second end part of the balloon to the middle part, and the first end part and the second end part are arranged oppositely; the first diameter-changing section is connected with the accommodating pipe through a traction wire, and the traction wire is in sliding fit with the accommodating pipe along the extension direction of the accommodating pipe so as to drive the balloon to be switched between the first position and the second position; the blade is connected with the first variable-diameter section, does not protrude out of the constant-diameter section in the radial outward direction of the balloon, and is used for being attached to a blood vessel wall; the blades are arranged in a plurality and are connected with the first variable-diameter section and distributed in the circumferential direction of the balloon; when the cutting module is at the second position, the cutting edges of the blades together form an annular cutting edge around the balloon, and the blades and the first variable-diameter section together define a containing groove for containing thrombus; when the cutting module is in the second position, adjacent blade portions overlap in a circumferential direction of the balloon; each blade is provided with a first assembling side face and a second assembling side face which are oppositely arranged in the circumferential direction of the balloon, and the first assembling side face and the second assembling side face are arranged into mutually matched inclined faces; when the cutting module is in the second position, adjacent blades are butted by the corresponding first assembly side and second assembly side.

2. The thrombus cutting system of claim 1, wherein:

the balloon is configured as a self-expanding balloon.

3. The thrombus cutting system of claim 1, wherein:

each blade is set to be an arc-shaped blade.

4. The thrombus cutting system according to any one of claims 1 to 3, wherein:

the inner wall of the far end of the conveying pipe is provided with a conical surface, and the diameter of the conical surface is gradually increased in the direction from the near end to the far end of the conveying pipe; the conical surface is used for abutting against the blades after the cutting edge cuts thrombus so as to enable the blades to be inserted into the far end of the conveying pipe.

5. The thrombus cutting system of claim 4, wherein:

the blade is characterized in that an annular sealing structure is arranged on the conical surface and used for abutting against the outer side surface of the blade so as to seal a gap between the blade and the conical surface.

6. The thrombus cutting system of claim 1, wherein:

at least one of the conveying pipe and the accommodating pipe is provided with a developing piece.