Cutting knife

Abstract

The invention relates to a cutting knife which comprises a cutting assembly, a collecting assembly and an outer pipe assembly, the cutting assembly and the collecting assembly are contained in the outer pipe assembly in a compressible mode, and the cutting assembly and the collecting assembly can move relative to the outer pipe assembly and are released outside the outer pipe assembly. The collecting assembly is released on one side of the vein valve, the cutting assembly is released on one side of the vein valve, and the cutting assembly can move towards the collecting assembly so as to cut the vein valve and store cut valve fragments in the cutting assembly and the collecting assembly. After the cutting knife cuts a vein valve, cut valve fragments are stored in the cutting assembly and the collecting assembly and withdrawn from the human body along with the outer tube assembly, and then the cut valve fragments are prevented from flowing along with blood to escape into the artery. Serious consequences such as sudden cardiac arrest and cerebral anoxia caused by the fact that valve fragments enter the artery are avoided.

Description

Technical Field

[0001] The present invention relates to the field of interventional medicine, and particularly to a cutting knife. Background Art

[0002] Chronic limb threatening ischemia (CLTI) is the most severe form of PAD, which often occurs in patients with coronary artery disease, diabetes, obesity, high cholesterol, and / or hypertension. Patients with CLTI often experience profound chronic pain and develop wounds or infections that lead to severe amputations, and are closely related to increased mortality and decreased quality of life. To relieve the symptoms of CLTI, patients are mainly treated by angioplasty or open bypass surgery. However, in many advanced patients, neither of these two options is feasible due to extensive disease of the target artery or other anatomical limitations. A minimally invasive technique aims to divert blood around the diseased artery in the leg and deliver it into the tibial vein that supplies blood to the foot, thereby delivering blood and oxygen to the ischemic and hypoxic tissues of the foot. A large amount of oxygen in the tissues can immediately relieve pain and promote the healing of chronic wounds in many patients, improving their quality of life. And a prerequisite for achieving this arteriovenousization is to first deal with the valves in the vein.

[0003] In the prior art, a venous valve knife is usually used to deal with the valves in the vein. The venous valve knife adjusts the size of the knife head through the telescopic movement of the handle, and tears the venous valve through the barbs on the knife head. However, the torn valve fragments will enter the artery and cause serious consequences, which may lead to serious consequences such as cardiac arrest and cerebral hypoxia. Summary of the Invention

[0004] To overcome the problems existing in the prior art, the present invention provides a cutting knife for cutting foreign bodies in human tissues and collecting the cut foreign body fragments. The cutting knife includes a cutting assembly, a collecting assembly, and an outer tube assembly. The cutting assembly and the collecting assembly can be compressively accommodated in the outer tube assembly. The cutting assembly and the collecting assembly can move relative to the outer tube assembly and be released outside the outer tube assembly. The distal end of the collecting assembly is released on one side of the foreign body, and the distal end of the cutting assembly is released on the other side of the foreign body. The cutting assembly can move towards the collecting assembly to cut the foreign body and collect the cut foreign body fragments in the cutting assembly and the collecting assembly.

[0005] In some embodiments of the present invention, the outer tube assembly includes a catheter seat and an outer tube. The proximal end of the outer tube is connected to the distal end of the catheter seat. The distal ends of the cutting assembly and the collecting assembly can be accommodated in the outer tube, and the proximal ends of the cutting assembly and the collecting assembly pass through the proximal end of the catheter seat and are exposed outside the catheter seat.

[0006] In some embodiments of the present invention, the collection assembly includes a collection wire basket, a collection connecting rod, a collection connecting ring, a collection push rod, and a collection push seat. The collection push seat is arranged on the outer side of the proximal end of the catheter seat. The proximal end of the collection push rod is connected to the collection push seat, the distal end of the collection push rod is connected to the proximal end of the collection wire basket, the collection connecting ring is movably sleeved on the distal end of the collection push rod, the proximal end of the collection connecting rod is connected to the collection connecting ring, and the distal end of the collection connecting rod is connected to the outer wall of the collection wire basket.

[0007] In some embodiments of the present invention, the cutting assembly includes a cutting push seat, a cutting push rod, and a tool module. The proximal end of the cutting push rod sequentially passes through the collection push rod, the catheter seat, and the collection push seat and is connected to the cutting push seat. Part of the tool module is located at the distal end of the collection push rod, and the distal end of the cutting push rod is connected to the tool module.

[0008] In some embodiments of the present invention, the tool module includes a tool, a fixed rod, and a cutting wire basket. The proximal end of the fixed rod is fixed in the cutting push seat or the cutting push rod. The distal end of the fixed rod passes out of the distal end of the cutting push rod and enters the cutting wire basket and is connected to the distal end of the cutting wire basket. The tool is arranged on the inner wall of the cutting wire basket.

[0009] In some embodiments of the present invention, the tool module further includes an operating mechanism. The operating mechanism includes an operating part and a connecting part. The operating part is movably arranged on the cutting push seat and partially exposed outside the cutting push seat. The tool module further includes a tool connecting ring and a tool connecting piece. The tool connecting ring is movably sleeved on the distal end of the cutting push rod. The proximal end of the tool connecting piece is connected to the tool connecting ring, and the distal end of the tool connecting piece is connected to the inner wall of the cutting wire basket. The proximal end of the connecting part is connected to the operating part, and the distal end of the connecting part is connected to the tool connecting ring.

[0010] In some embodiments of the present invention, the collection assembly includes a collection wire basket, a collection connecting rod, a collection connecting ring, a collection push rod, and a collection push seat. The collection push seat is arranged on the outer side of the proximal end of the catheter seat. The proximal end of the collection push rod is connected to the collection push seat. The collection wire basket is sleeved and fixed on the distal end of the collection push rod. The collection connecting ring is close to the proximal end of the collection wire basket and movably sleeved on the collection push rod. The proximal end of the collection connecting rod is connected to the collection connecting ring, and the distal end of the collection connecting rod is connected to the inner wall of the collection wire basket.

[0011] In some embodiments of the present invention, the cutting assembly includes a cutting push seat, a cutting push rod, and a tool module. The proximal end of the cutting push rod passes through the outer tube and the catheter seat and is movably connected to the collection push seat. The tool module is disposed at the distal end of the cutting push rod. The proximal end of the collection connecting rod passes through the cutting push rod and is connected to the collection push seat. The distal ends of the collection basket, the collection connecting ring, and the collection connecting rod are exposed outside the distal end of the cutting push rod.

[0012] In some embodiments of the present invention, the cutting assembly further includes an elastic member. The elastic member is sleeved on the proximal end of the cutting push rod. One end of the elastic member abuts against the inside of the collection push seat, and the other end abuts against the distal end of the cutting push seat. An activity track penetrating the inner and outer surfaces of the collection push seat is provided on the collection push seat. The outer surface of the cutting push seat protrudes outward to form a slider. The slider enters from the inside of the collection push seat and is received in the activity track.

[0013] In some embodiments of the present invention, the activity track includes a first track and a second track perpendicular to the first track. The first track is arranged along the axial direction of the collection push seat. The second track is provided between the proximal end and the distal end of the first track. The slider is disposed at the proximal end of the first track. The slider can slide from the first track to the second track.

[0014] Compared with the prior art, a cutting tool of the present invention has the following advantages: After the cutting assembly cuts the venous valve, the cut valve fragments will be received in the cutting assembly and the collection assembly and withdrawn from the human body along with the outer tube, thereby preventing the cut valve fragments from escaping into the artery with the blood flow and avoiding serious consequences such as cardiac arrest and cerebral hypoxia caused by the valve fragments entering the artery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the cutting tool provided by the first embodiment of the present invention.

[0016] Figure 2 is Figure 1 an enlarged view of part A in

[0017] Figure 3 is a three-dimensional structural schematic diagram of the collection assembly of the cutting tool provided by the first embodiment of the present invention.

[0018] Figure 4 is a three-dimensional structural schematic diagram of the collection basket, the collection connecting rod, and the collection connecting ring of the cutting tool provided by the first embodiment of the present invention.

[0019] Figure 5It is a schematic three-dimensional structure diagram of the cutting component of the cutting tool provided by the first embodiment of the present invention.

[0020] Figure 6 It is a schematic three-dimensional structure diagram of the cutting wire basket, cutting connecting rod, and cutting connecting ring of the cutting tool provided by the first embodiment of the present invention.

[0021] Figure 7 It is a schematic three-dimensional structure diagram of the cutting tool provided by the second embodiment of the present invention.

[0022] Figure 8 It is a schematic three-dimensional structure diagram of the collection component of the cutting tool provided by the second embodiment of the present invention.

[0023] Figure 9 It is a schematic three-dimensional structure diagram of the collection push rod, cutting connecting rod, and cutting connecting ring of the cutting tool provided by the second embodiment of the present invention.

[0024] Figure 10 It is a schematic three-dimensional structure diagram of the cutting component of the cutting tool provided by the second embodiment of the present invention.

[0025] Figure 11 Is Figure 7 The enlarged view at position B in

[0026] Figure 12 It is a schematic diagram of the cooperation state between the cutting wire basket and the collection wire basket of the cutting tool provided by the second embodiment of the present invention.

[0027] Explanation of the attached drawing reference numerals:

[0028] 100, cutting tool; 11, cutting component; 12, collection component; 13, outer tube component; 131, catheter seat; 132, outer tube; 121, collection wire basket; 122, collection connecting rod; 123, collection connecting ring; 124, collection push rod; 125, collection push seat; 1211, first through groove; 111, cutting push seat; 112, cutting push rod; 113, tool module; 1131, tool; 1132, fixed rod; 1133, cutting wire basket; 114, operating mechanism; 1141, operating part; 1142, connecting part; 1134, tool connecting ring; 1135, tool connecting piece; 1136, second through groove; 200, cutting tool; 21, cutting component; 22, collection component; 231, catheter seat; 232, outer tube; 221, collection wire basket; 222, collection connecting rod; 223, collection connecting ring; 224, collection push rod; 225, collection push seat; 2211, first through groove; 211, cutting push seat; 212, cutting push rod; 213, tool module; 214, elastic member; 2131, tool; 2133, cutting wire basket; 2251, moving track; 2211, slider; 2252, first track; 2253, second track. Detailed Implementation Modes

[0029] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be fully conveyed to those skilled in the art.

[0030] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0031] Although the terms first, second, third, etc. may be used in this document to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0032] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation other than the orientations depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below" or "beneath" other elements or features will subsequently be oriented as "above" or "over" other elements or features. Thus, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are to be interpreted accordingly.

[0033] To more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as common terms in the field of interventional medicine. Specifically, the "distal end" refers to the end away from the operator during the surgical operation, the "proximal end" refers to the end close to the operator during the surgical operation, the "axial direction" refers to its length direction, and the "radial direction" refers to the direction perpendicular to the "axial direction".

[0034] Please refer to Figure 1 and Figure 2, the first embodiment of the present invention provides a cutting knife 100, which can be used to remove foreign bodies in human tissues and collect the cut foreign body fragments. In the first embodiment of the present invention, taking the cutting of venous valves as an example for detailed description. The cutting knife 100 includes a cutting assembly 11, a collection assembly 12 and an outer tube assembly 13. The outer tube assembly 13 includes a catheter seat 131 and an outer tube 132. The proximal end of the outer tube 132 is connected to the distal end of the catheter seat 131. Both the catheter seat 131 and the outer tube 132 are hollow structures for instruments to pass through the outer tube assembly 13. The distal ends of the cutting assembly 11 and the collection assembly 12 can be compressively received in the outer tube 132. The proximal ends of the cutting assembly 11 and the collection assembly 12 pass through the outer tube 132 and the catheter seat 131, and protrude from the proximal end of the catheter seat 131 and are exposed outside the catheter seat 131. The cutting assembly 11 and the collection assembly 12 can move relative to the outer tube assembly 13. After the cutting assembly 11 and the collection assembly 12 move relative to the outer tube assembly 13, the distal ends of the cutting assembly 11 and the collection assembly 12 are released outside the distal end of the outer tube 132. When it is necessary to cut the venous valve, the distal end of the collection assembly 12 can be first released on one side of the venous valve. The collection assembly 12 has a positioning function. When the distal end of the collection assembly 12 is released, it can be anchored in the blood vessel. Subsequently, the distal end of the cutting assembly 11 can be released on the other side of the venous valve, and the cutting assembly 11 is moved towards the collection assembly 12. After the cutting assembly 11 passes through the venous valve, it will cut the venous valve. The cut valve fragments will move together with the cutting assembly 11 until the cutting assembly 11 cooperates with the collection assembly 12. The cut valve fragments will be received in the cutting assembly 11 and the collection assembly 12. At this time, the cutting assembly 11 and the collection assembly 12 can be recycled into the outer tube 132, and the outer tube 132 can be withdrawn from the human body, thereby driving the cutting assembly 11, the collection assembly 12 and the valve fragments to be withdrawn from the human body. After the cutting assembly 11 and the collection assembly 12 cut the venous valve, it can prevent the cut valve fragments from flowing away into the artery with the blood, thereby avoiding serious consequences such as cardiac arrest and cerebral hypoxia caused by the valve fragments entering the artery.

[0035] Please refer to Figure 1 and Figure 3 , the collection assembly 12 includes a collection wire basket 121, a collection connecting rod 122, a collection connecting ring 123, a collection pushing rod 124 and a collection pushing seat 125. The collection pushing seat 125 is arranged outside the proximal end of the catheter seat 131. The proximal end of the collection pushing rod 124 is connected to the collection pushing seat 125, and the distal end of the collection pushing rod 124 is connected to the proximal end of the collection wire basket 121. The collection connecting ring 123 is movably sleeved on the collection

[0036] At the distal end of the collection push rod 124, the proximal end of the collection connecting rod 122 is connected to the collection connecting ring 123, and the distal end of the collection connecting rod 122 is connected to the outer wall of the collection basket 121.

[0037] Specifically, in the first embodiment of the present invention, the collection basket 121 is made of a polymer material with good flexibility such as PET and PTFE, so as to ensure that the collection basket 121 can be compressed in the outer tube 132. The number of the collection connecting rods 122 is multiple, and the multiple collection connecting rods 122 are uniformly arranged in the circumferential direction of the collection basket 121 and the collection connecting ring 123. The multiple collection connecting rods 122 are made of a metal material with good elasticity such as nickel-titanium alloy, and the collection connecting rods 122 are pre-shaped. That is, the distal end of the collection connecting rod 122 is pre-shaped to extend outward from the collection connecting ring 123 and extend to the outside of the outer tube 132. When the collection assembly 12 is retracted into the outer tube 132, the multiple collection connecting rods 122 will be resisted by the inner wall of the outer tube 132, and the distal end of the collection connecting rod 122 will deform toward the direction of the collection push rod 124. After the collection connecting rod 122 deforms, it can push the collection connecting ring 123 to move proximally, as Figure 3 shown, to adapt to the deformation of the collection connecting rod 122 and avoid the force after the deformation of the collection connecting rod 122 acting on the collection basket 121 and causing damage to the collection basket 121. After the distal end of the collection connecting rod 122 deforms, it can drive the collection basket 121 to contract, so that the collection basket 121 and the collection connecting rod 122 can be retracted into the outer tube 132 to adapt to the inner diameter of the outer tube 132. When the collection basket 121, the collection connecting rod 122, and the collection connecting ring 123 are exposed at the distal end of the outer tube 132, the collection connecting rod 122 is not resisted by the outer tube 132, and the distal end of the collection connecting rod 122 rebounds away from the collection push rod 124 and rebounds to the pre-shaped shape. The multiple collection connecting rods 122 can rebound to drive the collection basket 121 to expand, as Figure 4 shown. When the distal end of the collection connecting rod 122 abuts against the blood vessel wall, the outer wall of the collection basket 121 will also

[0038] adhere to the blood vessel wall, so that the collection basket 121 plays a positioning role.

[0039] It should be noted that a plurality of first through grooves 1211 with a smaller width and penetrating the inner and outer surfaces of the collection basket 121 are provided on the collection basket 121 for blood to pass through the collection basket 121. At the same time, since the width of the first through grooves 1211 is smaller, valve fragments cannot pass through the first through grooves 1211, thereby ensuring that the valve fragments can be collected in the collection basket 121. A plurality of through holes can also be provided on the collection basket 121 to form a filter structure. Blood can flow through the through holes, while valve fragments cannot pass through the through holes with a smaller size. In the first embodiment of the present invention, the collection basket 121 is released on the proximal side of the venous valve, that is, the side where the venous valve is closer to the collection assembly 12.

[0040] Furthermore, the process of releasing and retrieving the entire collection assembly 12 in the blood vessel is as follows: In the initial state, the collection basket 121, the collection connecting rod 122, and the collection connecting ring 123 are compressed and stored in the outer tube 132. When the outer tube 132 moves to the proximal side of the venous valve, the collection push seat 125 is pushed distally, and the collection push rod 124 driven by the collection push seat 125 moves distally. The movement of the collection push rod 124 drives the collection basket 121, the collection connecting rod 122, and the collection connecting ring 123 to move distally and expand on the proximal side of the venous valve. When it is necessary to retrieve the collection basket 121, the collection connecting rod 122, and the collection connecting ring 123, the collection push seat 125 is pulled proximally, and the collection push rod 124 driven by the collection push seat 125 moves proximally. The movement of the collection push rod 124 drives the collection basket 121, the collection connecting rod 122, and the collection connecting ring 123 to move proximally and be retrieved into the outer tube 132.

[0041] Please refer to Figure 5 and Figure 6 , the cutting assembly 11 includes a cutting push seat 111, a cutting push rod 112, and a tool module 113. The proximal end of the cutting push rod 112 sequentially passes through the collection push rod 114, the catheter seat 131, the collection push seat 125 and is connected to the cutting push seat 111. A part of the tool module 113 is located at the distal end of the collection push rod 124.

[0042] The distal end of the cutting and pushing rod 112 is connected to the tool module 113. The cutting and pushing rod 112 and the collecting and pushing rod 124 are coaxially arranged, and the cutting assembly 11 can move relative to the collecting assembly 12. Further, the tool module 113 includes a tool 1131, a fixed rod 1132, and a cutting wire basket 1133. The proximal end of the fixed rod 1132 is fixed in the cutting and pushing seat 111 or the cutting and pushing rod 112. The distal end of the fixed rod 1132 passes through the distal end of the cutting and pushing rod 112 and enters the cutting wire basket 1133 and is connected to the distal end of the cutting wire basket 1133. The tool 1131 is arranged on the inner wall of the cutting wire basket 1133, and the proximal end of the tool 1131 is exposed outside the proximal end of the cutting wire basket 1133, and the cutting edge of the tool 1131 faces the proximal end.

[0043] The tool module 113 further includes an operating mechanism 114. The operating mechanism 114 includes an operating part 1141 and a connecting part 1142. The operating part 1141 is movably arranged on the cutting and pushing seat 111 and is partially exposed outside the cutting and pushing seat 111. In the first embodiment of the present invention, a doctor can operate the operating part 1141 exposed outside the cutting and pushing seat 111, so that the operating part 1141 moves in the axial direction relative to the cutting and pushing seat 111. The tool module 113 further includes a tool connecting ring 1134 and a tool connecting member 1135. The tool connecting ring 1134 is movably sleeved on the distal end of the cutting and pushing rod 112. The proximal end of the tool connecting member 1135 is connected to the tool connecting ring 1134, and the distal end of the tool connecting member 1135 is connected to the inner wall of the cutting wire basket 1133. The proximal end of the connecting part 1142 is connected to the operating part 1141, and the distal end of the connecting part 1142 is connected to the tool connecting ring 1134.

[0044] Specifically, in the first embodiment of the present invention, the cutting wire basket 1133 is made of a polymer material with good flexibility such as PET and PTFE, so as to ensure that the cutting wire basket 1133 can be compressed in the outer tube 132. The number of the tool connecting members 1135 is at least multiple, and the multiple tool connecting members 1135 are uniformly arranged in the circumferential direction of the cutting wire basket 1133 and the tool connecting ring 1134. The tool connecting member 1135 is made of a metal with good elasticity

[0045] Made of a material such as nitinol alloy, the tool connecting member 1135 is in a rod-shaped structure, and the tool connecting member 1135 is pre-bent into a curved structure, and the bending direction of the tool connecting member 1135 faces outward. The connecting portion 1142 is a metal wire made of a metal material with strong support, such as stainless steel wire. After the collection basket 121 is released on the proximal side of the venous valve, the cutting push seat 111 can be pushed distally, so that the cutting push rod 112 and the tool module 113 as a whole move distally and are exposed at the distal end of the outer tube 132. When the cutting basket 1133 moves to the distal side of the venous valve, the operating portion 1141 can be pushed distally to drive the connecting portion 1142 to move distally. The distal movement of the connecting portion 1142 can drive the tool connecting ring 1134 to move distally. After the tool connecting ring 1134 moves distally, it will drive the tool connecting member 1135 to move distally. Since the cutting basket 1133 is connected to the fixed rod 1132, the cutting basket 1133 will not move relative to the fixed rod 1132 and the cutting push rod 112. Therefore, when the tool connecting member 1135 moves distally, it will be resisted by the inner wall of the cutting basket 1133, and thus generate a bending deformation. And because the bending direction of the tool connecting member 1135 faces outward, a plurality of the tool connecting members 1135 will generate a bending deformation outward, thereby supporting the cutting basket 1133 to expand the cutting basket 1133, such as Figure 6 shown. Then, the cutting push seat 111 can be pulled proximally to move the cutting basket 1133 toward the venous valve. When the cutting basket 1133 passes through the venous valve, the tool 1131 exposed at the proximal end of the cutting basket 1133 cuts through the venous valve, and the cut valve fragments will enter the cutting basket 1133. Then the cutting basket 1133 continues to move proximally until the proximal end of the cutting basket 1133 contacts the distal end of the collection basket 121. At this time, the valve fragments will be collected in the cutting basket 1133 and the collection basket 121. Then, the cutting basket 1133 and the collection basket 121 are recycled into the outer tube 132, and the valve fragments will be withdrawn from the body along with the outer tube 132.

[0046] It should be noted that, please combine Figures 3 to 6, in the first embodiment of the present invention, a plurality of second through grooves 1136 with relatively small widths and penetrating the inner and outer surfaces of the cutting basket 1133 are provided on the cutting basket 1133, so that blood can pass through the cutting basket 1133. At the same time, since the width of the second through groove 1136 is relatively small, valve fragments cannot pass through the second through groove 1136, thereby ensuring that the valve fragments can be collected in the cutting basket 1133. A plurality of through holes can also be provided on the cutting basket 1133 to form a filter structure. Blood can flow through the through holes, while valve fragments cannot pass through the through holes with relatively small sizes. When recovering the cutting basket 1133 and the collection basket 121, first move the cutting assembly 11 and the collection assembly 12 together towards the proximal end until the collection connecting rod 122 abuts against the inner wall of the distal end of the outer tube 132. After the collection connecting rod 122 deforms, it drives the collection basket 121 to contract. At this time, the outer diameter of the collection basket 121 is smaller than the outer diameter of the cutting basket 1133, and the collection basket 121 will enter the cutting basket 1133, that is, the cutting basket 1133 will cover the distal end of the collection basket 121. At this time, the operation part 1141 can be released, and the tool connecting part 1135 will return to its original state and drive the cutting basket 1133 to contract, so that the inner wall of the cutting basket 1133 closely adheres to the outer wall of the collection basket 121, thereby preventing valve fragments from escaping from the cutting basket 1133 and the collection basket 121 during recovery. Then continue to move the cutting assembly 11 and the collection assembly 12 towards the proximal end until the cutting basket 1133 and the collection basket 121 are both received in the outer tube 132. Then, the cutting assembly 11, the collection assembly 12, and the outer tube assembly 13 are withdrawn from the human body as a whole.

[0047] Please refer to Figures 7 to 9 , the second embodiment of the present invention provides a cutting knife 200. The main difference between the cutting knife 200 and the cutting knife 100 in the first embodiment is that: the collection assembly 22 includes a collection basket 221, a collection connecting rod 222, a collection connecting ring 223, a collection push rod 224, and a collection push seat 225. The collection push seat 225 is arranged near the

[0048] At the outer end, the proximal end of the collection push rod 224 is connected to the collection push seat 225, and the collection basket 221 is sleeved and fixed at the distal end of the collection push rod 224. The collection connection ring 223 is close to the proximal end of the collection basket 221 and is movably sleeved on the collection push rod 224. The proximal end of the collection connection rod 222 is connected to the collection connection ring 223, and the distal end of the collection connection rod 222 is connected to the inner wall of the collection basket 221. The collection basket 221 is released at the distal end of the venous valve. When recovering the collection assembly 22, the collection connection rod 222 abuts against the inner wall of the outer tube 232, thereby driving the collection connection rod 222 to deform in a direction close to the collection push rod 224. The deformation of the collection connection rod 222 drives the collection connection ring 223 to move proximally, and the deformation of the collection connection rod 222 drives the collection basket 221 to contract. When releasing the collection basket 221, since the collection connection rod 222 has been pre-shaped, the collection connection rod 222 will expand into a pre-shaped form after release, thereby driving the collection basket 221 to expand and anchor in the blood vessel.

[0049] Please refer to Figures 7 to 11 , further, the cutting assembly 21 includes a cutting push seat 211, a cutting push rod 212, and a tool module 213. The proximal end of the cutting push rod 212 passes through the outer tube 232 and the catheter seat 231 and is movably connected to the collection push seat 225. The tool module 213 is disposed at the distal end of the cutting push rod 212. The proximal end of the collection connection rod 222 passes through the cutting push rod 212 and is connected to the collection push seat 225. The distal ends of the collection basket 221, the collection connection ring 223, and the collection connection rod 222 are exposed outside the distal end of the cutting push rod 212. The cutting assembly 21 further includes an elastic member 214, and the elastic member 214 has good elasticity. For example, the elastic member 214 is a spring. The elastic member 214 is sleeved on the proximal end of the cutting push rod 212. One end of the elastic member 214 abuts inside the collection push seat 225, and the other end abuts against the distal end of the cutting push seat 211, thereby ensuring the spaced arrangement of the cutting basket 2133 and the collection basket 221. There is a

[0050] active track 2251 penetrating the inner and outer surfaces of the collection push seat 225. The outer surface of the cutting push seat 211 protrudes outward to form a slider 2211, and the slider 2211 enters from the inside of the collection push seat 225 and is received in the active track 2251.

[0051] Specifically, the tool module 213 only includes the tool 2131 and the cutting basket 2133. The tool 2131 is an annular knife, and the tool 2131 is arranged on the distal end of the cutting basket 2133. The diameter of the tool 2131 is smaller than the diameter of the collection basket 221. The cutting basket 2133 and the collection basket 221 are arranged at intervals in the initial state. When it is necessary to release the distal ends of the cutting assembly 21 and the collection assembly 22, first transport the outer tube 232 to the distal side of the venous valve, and then push the collection push seat 225, so that the collection basket 221 is released on the distal side of the venous valve. Then pull the catheter seat 231 to move the outer tube 232 proximally, so as to release the cutting basket 2133. Since the cutting basket 2133 and the collection basket 221 are arranged at intervals, after the cutting basket 2133 and the collection basket 221 are released, they are respectively released on both sides of the venous valve. Then, the slider 2211 can be pushed to move distally. The movement of the slider 2211 compresses the elastic member 214 and drives the cutting push seat 211 to move distally. The distal movement of the cutting push seat 211 drives the cutting push rod 212 to move distally. The distal movement of the cutting push rod 212 drives the cutting basket 2133 and the tool 2131 arranged on the distal end of the cutting basket 2133 to move distally. After the tool 2131 passes through the venous valve, the venous valve is cut, and the valve fragments will enter the cutting basket 2133. Until the cutting basket 2133 moves into the collection basket 221, as Figure 12 shown. Since the diameter of the tool 2131 at the distal end of the cutting basket 2133 is small, the tool 2131 will abut against the collection connecting rod 222 and cause the collection connecting rod 222 to deform in the direction of the collection push rod 224. The deformation of the collection connecting rod 222 will drive the collection basket 221 to contract, and then

[0052] the collection basket 221 contracts to a size that can be retracted into the outer tube 232. Then pull the collection push seat 225 again until the cutting basket 2133 and the collection basket 221 are retracted into the outer tube 232. At this time, the slider 2211 can be released, and the elastic member 214 returns to its original state, driving the slider 2211 to slide proximally, so that the cutting push rod 212 and the tool module 213 move proximally, maintaining the spaced arrangement of the cutting basket 2133 and the collection basket 221.

[0053] Furthermore, please refer to Figure 10 and Figure 11, the movable track 2251 includes a first track 2252 and a second track 2253 which is perpendicular to the first track 2252. The first track 2252 is arranged along the axial direction of the collection and pushing seat, and the second track 2253 is arranged between the proximal end and the distal end of the first track 2252. In the initial state, the slider 2211 is arranged at the proximal end of the first track 2252. When the slider 2211 is pushed to move towards the distal end, the cutting and pushing seat 211 makes an axial movement towards the distal end, thereby compressing the elastic member 214. When the slider 2211 slides to the position of the second track 2253, the slider 2211 can be slid in the direction of the second track 2253, so that the slider 2211 slides from the first track 2252 to the second track 2253, that is, the whole collection assembly 12 rotates in the direction of the second track 2253. Since the second track 2253 is perpendicular to the first track 2252, when the slider 2211 enters the second track 2253, the axial movement of the slider 2211 is restricted, so that the cutting assembly 21 can be fixed at a certain position after the axial movement, and there is no need to apply a force to overcome the elastic member 214 to the slider 2211 for a long time, thereby maintaining the position of the cutting assembly 21.

[0054] Compared with the prior art, a cutting knife of the present invention has the following advantages: after the cutting assembly cuts the venous valve, the cut valve fragments will be received in the cutting assembly and the collection assembly, and will be withdrawn from the human body along with the outer tube, thereby preventing the cut valve fragments from escaping into the artery with the blood flow and avoiding serious consequences such as cardiac arrest and cerebral hypoxia caused by the valve fragments entering the artery.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cutting knife for cutting foreign bodies in human tissues and collecting the cut foreign body fragments, characterized in that: The cutting tool includes a cutting component, a collection component, and an outer tube component. The cutting component and the collection component can be compressively stored in the outer tube component. The cutting component and the collection component can move relative to the outer tube component and be released outside the outer tube component. The distal end of the collection component is released on one side of the foreign object, and the distal end of the cutting component is released on the other side of the foreign object. The cutting component can move towards the collection component to cut the foreign object and collect the cut foreign object fragments in the cutting component and the collection component.

2. The cutting tool according to claim 1, wherein: The outer tube component includes a catheter seat and an outer tube. The proximal end of the outer tube is connected to the distal end of the catheter seat. The distal ends of the cutting component and the collection component can be stored in the outer tube. The proximal ends of the cutting component and the collection component pass through the proximal end of the catheter seat and are exposed outside the catheter seat.

3. The cutting tool according to claim 2, characterized in that: The collection component includes a collection wire basket, a collection connecting rod, a collection connecting ring, a collection pushing rod, and a collection pushing seat. The collection pushing seat is arranged outside the proximal end of the catheter seat. The proximal end of the collection pushing rod is connected to the collection pushing seat, the distal end of the collection pushing rod is connected to the proximal end of the collection wire basket. The collection connecting ring is movably sleeved on the distal end of the collection pushing rod. The proximal end of the collection connecting rod is connected to the collection connecting ring, and the distal end of the collection connecting rod is connected to the outer wall of the collection wire basket.

4. The cutting tool according to claim 3, characterized in that: The cutting component includes a cutting pushing seat, a cutting pushing rod, and a tool module. The proximal end of the cutting pushing rod sequentially passes through the collection pushing rod, the catheter seat, and the collection pushing seat and is connected to the cutting pushing seat. Part of the tool module is located at the distal end of the collection pushing rod, and the distal end of the cutting pushing rod is connected to the tool module.

5. The cutting tool according to claim 4, characterized in that: The tool module includes a tool, a fixed rod, and a cutting wire basket. The proximal end of the fixed rod is fixed in the cutting pushing seat or the cutting pushing rod. The distal end of the fixed rod passes through the distal end of the cutting pushing rod, enters the cutting wire basket, and is connected to the distal end of the cutting wire basket. The tool is arranged on the inner wall of the cutting wire basket.

6. The cutting tool according to claim 5, characterized in that: The tool module further includes an operating mechanism. The operating mechanism includes an operating part and a connecting part. The operating part is movably arranged on the cutting pushing seat and is partially exposed outside the cutting pushing seat. The tool module further includes a tool connecting ring and a tool connecting piece. The tool connecting ring is movably sleeved on the distal end of the cutting pushing rod. The proximal end of the tool connecting piece is connected to the tool connecting ring, and the distal end of the tool connecting piece is connected to the inner wall of the cutting wire basket. The proximal end of the connecting part is connected to the operating part, and the distal end of the connecting part is connected to the tool connecting ring.

7. The cutting tool according to claim 2, characterized in that: The collection component includes a collection basket, a collection connecting rod, a collection connecting ring, a collection pushing rod, and a collection pushing seat. The collection pushing seat is arranged on the outer side of the proximal end of the catheter seat. The proximal end of the collection pushing rod is connected to the collection pushing seat. The collection basket is sleeved and fixed on the distal end of the collection pushing rod. The collection connecting ring is close to the proximal end of the collection basket and is movably sleeved on the collection pushing rod. The proximal end of the collection connecting rod is connected to the collection connecting ring, and the distal end of the collection connecting rod is connected to the inner wall of the collection basket.

8. The cutting tool according to claim 7, wherein: The cutting component includes a cutting pushing seat, a cutting pushing rod, and a tool module. The proximal end of the cutting pushing rod passes through the outer tube and the catheter seat and is movably connected to the collection pushing seat. The tool module is arranged at the distal end of the cutting pushing rod. The proximal end of the collection connecting rod passes through the cutting pushing rod and is connected to the collection pushing seat. The distal ends of the collection basket, the collection connecting ring, and the collection connecting rod are exposed outside the distal end of the cutting pushing rod.

9. The cutting tool according to claim 8, characterized in that: The cutting component further includes an elastic member. The elastic member is sleeved on the proximal end of the cutting pushing rod. One end of the elastic member abuts against the inside of the collection pushing seat, and the other end abuts against the distal end of the cutting pushing seat. An activity track penetrating the inner and outer surfaces of the collection pushing seat is arranged on the collection pushing seat. The outer surface of the cutting pushing seat protrudes outward to form a slider, and the slider enters from the inner side of the collection pushing seat and is received in the activity track.

10. The cutting tool according to claim 9, characterized in that: The activity track includes a first track and a second track perpendicular to the first track. The first track is arranged along the axial direction of the collection pushing seat. The second track is arranged between the proximal end and the distal end of the first track. The slider is arranged at the proximal end of the first track, and the slider can slide from the first track to the second track.

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