Volume reduction catheter system

Abstract

The present invention discloses a volume reduction catheter system, comprising a cutting section and a conveying section which are arranged continuously, wherein the cutting section comprises a cutting assembly, the conveying section comprises a transmission shaft fixedly connected to the cutting assembly and a sleeve sleeved on the surface of the transmission shaft, the transmission shaft can rotate relative to the sleeve, and is characterized in that a conveying groove is provided on the transmission shaft, a clearing part is provided on the inner wall of the sleeve, and the clearing part comprises a decomposition part extending toward the transmission shaft. By providing a conveying groove on the transmission shaft, the tissue conveyed by the conveying groove collides with the decomposition part of the clearing part provided on the inner wall of the sleeve and extending toward the transmission shaft, thereby being further decomposed, and the volume reduction catheter system realizes the full decomposition of the conveyed tissue, and avoids the accumulation of tissue on the conveying groove, which causes blockage and makes it difficult to convey the cut tissue, or even flows back into the blood vessel.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a volume reduction catheter system. Background Art

[0002] Arteriosclerosis obliterans (ASO) of the lower extremities is a common and frequently occurring disease among the middle-aged and elderly people, and is also an important manifestation of atherosclerosis in the lower extremities.

[0003] At present, the treatment methods for lower extremity arteriosclerosis obliterans mainly include drug therapy, surgical operation, endoluminal treatment, combined surgery, autologous peripheral blood stem cell transplantation, gene drug therapy, etc. Endoluminal treatment of lower extremity arteriosclerosis obliterans has the advantages of minimally invasive, safe, effective, and fast recovery, and has become the first choice for the treatment of lower extremity arteriosclerosis obliterans. At present, endoluminal treatment methods include conventional percutaneous transluminal angioplasty (PTA) and emerging endoluminal volume reduction. Simple PTA has obvious limitations. Simply dilating the stenotic segment cannot remove excess tissue, and it is inevitable to stretch the vascular wall, which is prone to pressure injury and dissection. It is easy to rebound after surgery and present a restenosis state. Therefore, PTA is usually used in combination with endoluminal volume reduction. Among them, the endoluminal mechanical plaque resection in the endoluminal volume reduction can remove plaques, and combined with PTA, a good therapeutic effect can be achieved. However, in the existing intracavitary volume reduction surgery, after the excess tissue is removed, the removed excess tissue is not processed and is transported out in its original state, which results in insufficient decomposition of the excess tissue, an unsmooth transportation process of the excess tissue, and low overall work efficiency. Summary of the invention

[0004] To this end, the present invention provides a volume reduction catheter system to solve the problem that the existing intracavitary volume reduction devices do not completely decompose excess tissue, thereby resulting in an unsmooth transportation process and low overall work efficiency.

[0005] The technical solution adopted by the present invention is:

[0006] A volume reduction catheter system is provided, comprising a cutting section and a conveying section which are continuously arranged, wherein the cutting section comprises a cutting assembly, and the conveying section comprises a transmission shaft fixedly connected to the cutting assembly and a sleeve sleeved on the surface of the transmission shaft, wherein the transmission shaft can rotate relative to the sleeve, a conveying groove is provided on the transmission shaft, and a clearing portion is provided on the inner wall of the sleeve, wherein the clearing portion comprises a disassembly component extending toward the transmission shaft.

[0007] In one embodiment, the sleeve covers the proximal end of the cutting assembly, the clearing portion is provided at the position where the sleeve covers the cutting assembly, the cutting assembly includes a cutter head, the cutter head includes a plurality of blades extending from the proximal end to the distal end, a conveying groove is formed between two adjacent blades, at least one of the blades is provided with a through groove, the through groove is connected to the conveying groove adjacent to the blade, and when the transmission shaft and the sleeve rotate relative to each other, the decomposition component passes through the conveying groove multiple times.

[0008] In one embodiment, there are one or more disassembly parts, and during the rotation of the cutter head, at least a portion of one of the disassembly parts is always located in one of the through grooves to limit the axial position of the cutter head.

[0009] In one embodiment, the number of the disassembly components is at least two, and at least two of the disassembly components are spaced apart along the circumferential direction or the axial direction of the sleeve.

[0010] In one embodiment, the blade extends in a spiral shape from the proximal end to the distal end, and the helical angle of the delivery groove gradually decreases from the distal end to the proximal end.

[0011] In one embodiment, the axial width of the disassembly component is smaller than the axial width of the through slot, and the axial position of the proximal end of the disassembly component relative to the proximal end of the through slot is adjustable.

[0012] In one embodiment, the conveying groove is formed by winding a linear body on the surface of the transmission shaft, and a gap is left between the decomposition member and the linear body in the radial direction.

[0013] In one embodiment, there are multiple linear bodies, and the decomposition component is located between two adjacent linear bodies, with a gap between the decomposition component and the surface of the transmission shaft in a radial direction.

[0014] In one embodiment, the conveying groove is a part of the transmission shaft, and the side wall of the conveying groove extends spirally along the transmission shaft. The side wall is provided with an avoidance groove for avoiding the disassembly component at a position of the transmission shaft corresponding to the disassembly component, and when the transmission shaft moves relative to the sleeve, the disassembly component can freely pass through the avoidance groove.

[0015] In one of the embodiments, a plurality of decomposition grooves are provided on the sleeve, and when the sleeve and the transmission shaft rotate relative to each other, the decomposition grooves are connected with the conveying groove at least at a certain moment.

[0016] Beneficial effects of the embodiments of the present invention:

[0017] The volume reduction catheter system of the present invention comprises a cutting section and a conveying section which are continuously arranged, wherein the conveying section comprises a transmission shaft fixedly connected to the cutting assembly and a sleeve sleeved on the surface of the transmission shaft, the transmission shaft can rotate relative to the sleeve, and a conveying groove is provided on the transmission shaft. The tissue conveyed by the conveying groove collides with a decomposition part which is arranged on the inner wall of the sleeve and extends toward the transmission shaft, thereby being further decomposed. The volume reduction catheter system realizes the full decomposition of the conveyed tissue, avoids the accumulation of tissue on the conveying groove, causes blockage, and makes it difficult to convey the cut tissue, or even flows back into the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall schematic diagram of the medical cutting assembly in Example 1;

[0019] Figure 2 is an exploded schematic diagram of the medical cutting assembly in Example 1;

[0020] Figure 3 is a schematic diagram of the structure of the cutter head in Example 1;

[0021] Figure 4 is a schematic structural diagram of the position limiting member in Example 1;

[0022] Figure 5 is a schematic diagram of the operation of the distal end of the volume reduction catheter system in Example 1;

[0023] Figure 6 is a schematic diagram of the operation of the volume reduction catheter system in Example 1;

[0024] Figure 7 is a schematic diagram of a delivery section of the volume reduction catheter system in Example 1;

[0025] Figure 8 yes Figure 7 Schematic diagram of cross section at the AA position;

[0026] Fig. 9 is a schematic diagram of the operation of the second clearing unit of the volume reduction catheter system in Example 1;

[0027] Fig.10 is a partial schematic diagram of a delivery section of another volume reduction catheter system in Example 1;

[0028] Fig.11 is a schematic structural diagram of a stopper of a medical cutting assembly in Example 2;

[0029] Fig.12 is an exploded schematic diagram of the medical cutting assembly in Example 3;

[0030] Fig.13 This is a schematic diagram of the installation of the cutter head and the stopper in the medical cutting assembly in Example 3;

[0031] Fig.14 is a schematic structural diagram of a stopper of a medical cutting assembly in Example 3;

[0032] Fig.15 is a schematic structural diagram of the distal end of the volume reduction catheter system in Example 5;

[0033] Fig.16 It is a schematic structural diagram of the distal end of the volume reduction catheter system in Example 6. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0035] In the description of the present invention, if it involves a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. If a feature is referred to as being "set", "fixed", or "connected" to another feature, it may be directly set, fixed, or connected to the other feature, or it may be indirectly set, fixed, or connected to the other feature.

[0036] In the description of the embodiments of the present invention, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In addition, unless otherwise defined, the technical terms and scientific terms used in the embodiments of the present invention are the same as those commonly understood by those skilled in the art. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] It should be noted that in the field of interventional medical devices, the end of a medical device implanted in a human or animal body that is closer to the operator is generally called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of a medical device are defined based on this principle. "Axial" generally refers to the length direction of a medical device when it is transported, and "radial" generally refers to the direction of a medical device that is perpendicular to its "axial direction", and the "axial" and "radial" of any component of a medical device are defined based on this principle.

[0039] Example 1

[0040] Embodiment 1 provides a medical cutting assembly and a corresponding volume reduction catheter system, wherein Figure 1-4 Corresponding to the medical cutting assembly 10, attached Figure 5-9 Corresponding volume reduction catheter system 11.

[0041] Reference Figure 1-2 , Figure 1 is an overall schematic diagram of the medical cutting assembly in Example 1, Figure 2 It is an exploded schematic diagram of the medical cutting assembly in Example 1. In this embodiment, the medical cutting assembly 10 includes a coaxially assembled cutter head 101, a limiter 102 and a first sleeve 103. Among them, the cutter head 101 is the main working component for cutting and transporting excess tissue. The limiter 102 is rotatably connected to the cutter head 101, and the limiter 102 can axially limit the cutter head 101. In this embodiment, the distal end of the limiter 102 is engaged with the proximal end of the cutter head 101 and can rotate relatively. In addition, the limiter 102 can also decompose the tissue transported by the cutter head 101 again. The first sleeve 103 is sleeved on the proximal end of the cutter head 101. On the one hand, it prevents the proximal end of the cutter head 101 from rotating to cut normal blood vessel walls or normal tissues. On the other hand, it also limits the radial displacement of the cutter head 101, that is, radially limits the cutter head 101.

[0042] The first sleeve 103 is sleeved on the outside of the cutter head 101, which not only limits the radial displacement of the cutter head 101 itself, but also prevents the cut tissue from directly leaving the conveying groove 1012 of the cutter head 101 in the radial direction when the cutter head 101 cuts and captures the stenotic tissue in the blood vessel at the distal end of the cutter head 101. The cut tissue will be transported from the distal end to the proximal end of the medical cutting assembly 10 along the conveying groove 1012. That is, the first sleeve 103 cooperates with the cutter head 101 to make the captured stenotic tissue move along the conveying groove 1012 toward the proximal end of the medical cutting assembly 10, so as to realize the function of cutting and transporting the tissue by the instrument. Specifically, the first sleeve 103 covers the proximal end of the cutter head 101 and the distal end of the stopper 102.

[0043] In another embodiment, the medical cutting assembly 10 does not include the first sleeve 103. In this case, the medical cutting assembly 10 can still have the function of cutting and decomposing tissues.

[0044] In another embodiment, the proximal end of the blade head 101 in the medical cutting assembly 10 can be placed in a sheath tube to collect the cut tissue with the help of the sheath tube.

[0045] Combination Figure 3 , Figure 4 Common explanation, Figure 3 is a schematic diagram of the structure of the cutter head 101 in Embodiment 1, Figure 4 1 is a schematic diagram of the structure of the limiter 102 in Example 1. Specifically, the proximal end of the cutter head 101 is rotatably connected to the distal end of the limiter 102, and the cutter head 101 is limited by the limiter 102 in axial movement toward the distal end. In actual operation, the limiter 102 is relatively fixed, and the cutter head 101 rotates around its own rotation axis 110 to achieve the rotary cutting function. At least two blades 1011 are provided on the surface of the cutter head 101, and the blades 1011 extend from the distal end to the proximal end of the cutter head 101 and are distributed in a spiral shape. The cutter head 101 drives the blade 1011 to rotate so as to cut the redundant tissue in the blood vessel. In fact, the working part of the blade 1011 to cut is the distal part of the blade 1011. The first sleeve 103 is provided at the proximal part of the blade 1011 to limit the radial displacement of the blade 1011 and protect the blood vessel or tissue at the proximal part of the blade 1011 from being cut by the proximal part of the blade 1011. A conveying groove 1012 extending in an axial spiral is provided between two adjacent blades 1011. As the cutter head 101 rotates around its own rotating axis 110, the cut tissue moves along the conveying groove 1012 between the blades 1011 and gradually approaches the proximal end of the medical cutting assembly 10 in the axial direction. In order to obtain a larger cutting area, the maximum outer diameter of the exposed part of the distal end of the cutter head 101 is equal to the outer diameter of the first sleeve 103.

[0046] The conveying groove 1012 is a spiral groove, and the angle between the tangent line 130 of any point 121 on the groove bottom center line 120 of the conveying groove 1012 and the rotary axis 110 of the cutter head 101 is the spiral angle of the conveying groove 1012. Figure 3 In the figure, the projection of the rotating axis 110 on the plane passing through the tangent line 130 and parallel to the rotating axis 110 is the projection line 111, and the angle α between the tangent line 130 and the projection line 111 is the helical angle. Due to the existence of the helical angle, when the cutter head 101 rotates, the conveying groove 1012 generates an axial component force on the captured tissue, thereby driving the captured tissue to move axially. The cutter head 101 can not only cut the stenotic tissue in the blood vessel, but also make the cut tissue move spirally along the conveying groove 1012 toward the proximal end of the medical cutting assembly 10, and then reach the predetermined location.

[0047] In another embodiment, in order to obtain a better conveying effect, the helical angle of the conveying groove 1012 gradually decreases from the distal end to the proximal end of the cutter head 101. Accordingly, since the conveying groove 1012 is formed by two adjacent blades 1011, the helical angle of the blade 1011 also changes with the helical angle of the conveying groove 1012. For the cutter head 101 as a whole, a larger helical angle is set at the distal end of the blade 1011, which is conducive to cutting and capturing tissues, and the cutting efficiency is high; as the conveying groove 1012 extends toward the proximal end, the helical angle of the conveying groove 1012 gradually decreases, which is conducive to the conveying of the captured tissue to the proximal end of the blade 1011.

[0048] In another embodiment, a plurality of blades 1011 extend in a straight line along the axis, and the conveying groove 1012 between two adjacent blades 1011 is a straight groove extending in the axial direction and parallel to the rotating axis 110. Since the distal end of the blade head 101 cuts the excess tissue, the cut tissue gradually enters the distal end of the conveying groove 1012. As the tissue in the conveying groove 1012 gradually increases, the tissue cut first is pushed to gradually move along the groove toward the proximal end of the conveying groove 1012. Therefore, the conveying groove 1012 is set in a spiral shape in Example 1 only as a shape selection to enable the conveying groove 1012 to have a good conveying capacity, and the specific shape of the conveying groove 1012 may not be limited.

[0049] In Embodiment 1, a plurality of through slots 1013 are provided at the proximal end of the blade head 101, each through slot 1013 circumferentially penetrates the blade 1011 where it is located and communicates with the conveying slot 1012 adjacent to the blade 1011. Figure 4 As shown, a plurality of decomposition pieces 1021 are provided at the distal end of the stopper 102 near the end, and the decomposition pieces 1021 are arranged in the shape of bosses, and the decomposition pieces 1021 protrude inward from the inner wall of the stopper 102, and the plurality of decomposition pieces 1021 are distributed at intervals along the circumference of the stopper 102. When the cutter head 101 rotates, the decomposition pieces 1021 alternately enter the through slots 1013 and the conveying slots 1012, and the decomposition pieces 1021 collide with the tissue in the conveying slots 1012 and decompose it into tissues of smaller volumes. In this embodiment, the plurality of decomposition pieces 1021 move simultaneously, and alternately pass through the plurality of through slots 1013 and the corresponding plurality of conveying slots 1012, respectively, and the processing efficiency is relatively high.

[0050] In another embodiment, the disassembly component 1021 is configured to be other shapes, including blade shape, sawtooth shape, etc., that is, the corresponding embodiment of the present application may not limit the specific shape of the disassembly component 1021 in the medical cutting assembly 10.

[0051] In addition, the disassembly component 1021 is inserted into the through slot 1013 to form a clamping structure, which realizes the axial limit of the cutter head 101 without affecting the rotation of the cutter head 101. In other words, during the rotation of the cutter head 101, if there is no other structure to axially limit the cutter head 101, at least a portion of at least one disassembly component 1021 is always located in a through slot 1013 to maintain the axial limit of the cutter head 101.

[0052] In another embodiment, the disassembly component 1021 only plays a disassembly role, a limit block is provided on the limit member 102, and a positioning groove is also provided at the proximal end of the cutter head 101. The limit block is engaged with the positioning groove to achieve axial limitation of the cutter head 101. When the cutter head 101 and the limit member 102 rotate relative to each other, the limit block does not need to intersect with the conveying groove 1012, but the limit block is always engaged with the positioning groove, and the disassembly component 1021 can be completely separated from the through groove 1013.

[0053] In another embodiment, when the vertical distances from the outer surfaces of multiple blades 1011 on the cutter head 101 to the rotating shaft 110 are different (i.e., the heights of the blades 1011 are different), at a certain axial position of the cutter head 101, the corresponding through grooves 1013 can be set to one or more along the circumferential direction, and the corresponding decomposition parts 1021 can also be set to one or more along the circumferential direction. When the cutter head 101 and the limiting groove 102 rotate relative to each other, the disassembly component 1021 passes through the through groove 1013 unhindered along the circumference. Generally speaking, it is sufficient to set the through groove 1013 on each blade 1011. In special cases, that is, when only a part of the blades 1011 are provided with the through groove 1013, it is necessary to satisfy the following conditions: the distance from the bottom surface of the disassembly component 1021 to the rotating axis 110 is greater than the distance from the outer surface of the blade 1011 without the through groove 1013 to the rotating axis 110, so as to achieve that the disassembly component 1021 can pass through the through groove 1013 unhindered along the circumference and will not collide with the blade 1011 without the through groove 1013.

[0054] When there is one through slot 1013 and one corresponding disassembly component 1012, the through slot 1013 is arranged at the proximal end of the blade 1011 where the vertical distance from the outer surface to the rotating shaft 110 is the largest. During the relative rotation between the through slot 1013 and the disassembly component 1012, a part of the disassembly component 1012 is always located in the through slot 1013.

[0055] When there is one through slot 1013 and there are multiple corresponding disassembly components 1012, the through slot 1013 is arranged at the proximal end of the blade 1011 where the vertical distance from the outer surface to the rotating shaft 110 is the largest. During the relative rotation between the through slot 1013 and the multiple disassembly components 1012, the multiple disassembly components 1012 alternately pass through the circumferential conveying groove 1012 and the through slot 1013 in sequence, and there is always a part of at least one disassembly component 1012 located in the through slot 1013.

[0056] When there are multiple through slots 1013 and one corresponding disassembly component 1012, during the relative rotation between the multiple through slots 1013 and the disassembly component 1012, the disassembly component 1012 sequentially passes through multiple conveying grooves 1012 and through slots 1013 along the circumferential direction, and at least a portion of the disassembly component 1012 is always located in at least one through slot 1013.

[0057] In another embodiment, when one or more through grooves 1013 are circumferentially arranged on the cutting head 101, a corresponding disassembly component 1021 is arranged on the limiting component 102. At this time, the circumferential length (arc length) of the connection between the disassembly component 1021 and the inner wall of the limiting component 102 is greater than the circumferential width of any conveying groove 1012, thereby ensuring that at least a portion of at least one disassembly component 1021 is always located in a through groove 1013, so as to achieve the decomposition of the cut tissue while maintaining the axial limitation of the cutting head 101.

[0058] In another embodiment, a plurality of through slots 1013 may be provided in the axial direction on the cutter head 101, and a plurality of disassembling components 1021 may be provided in the axial direction on the stopper 102. When the cutter head 101 rotates, the plurality of disassembling components 1021 in the axial direction simultaneously disassemble the tissues in the corresponding delivery slots 1012. Similarly, at least a portion of at least one disassembling component 1021 is always located in a through slot 1013 to maintain the axial limit of the cutter head 101.

[0059] In Example 1, the axial widths of the multiple disassembly components and the axial widths of the multiple through grooves 1013 are equal or the difference is small. Under the premise that the multiple disassembly components 1021 and the multiple through grooves 1013 can be snap-fitted and can rotate relative to each other, the cutter head 101 will not be displaced axially relative to the limit member 102. Furthermore, in order to make the relative rotation transition between the multiple disassembly components 1021 and the multiple through grooves 1013 smooth and without interference, the multiple disassembly components 1021 have the same axial width L1 in the entire circumferential direction, and the corresponding multiple through grooves 1013 have the same circumferential width L2 in the circumferential direction.

[0060] In another embodiment, the axial width L1 of the disassembly component 1021 and the axial width L2 of the through slot 1013 in the cutter head 101 can be set to different values, that is, the axial position of the disassembly component 1021 in the through slot 1013 can change, the axial width L1 of the disassembly component 1021 is smaller than the axial width L2 of the through slot 1013, and the medical cutting assembly 10 has an axial telescopic length change (L2-L1) along the axial direction. By adjusting the axial distance between the proximal end of the disassembly component 1021 and the proximal end of the through slot 1013, the extension amount of the cutter head 101 from the first sleeve 103 is changed; when the medical cutting assembly 10 does not include the first sleeve 103, by adjusting the axial distance between the proximal end of the disassembly component 1021 and the proximal end of the through slot 1013, the axial distance between the distal end of the cutter head 101 and the distal end of the stopper 102 is changed. In essence, regardless of whether the medical cutting assembly 10 includes the first sleeve 103, the axial distance between the proximal end of the adjustment decomposition member 1021 and the proximal end of the through slot 1013 is the axial distance between the distal end of the adjustment blade head 101 and the distal end of the stopper 102. Therefore, the blade head 101 has at least two different extension lengths relative to the stopper 102 or the first sleeve 103. When the extended length is the largest, the distal portion of the blade head 101 for cutting is the largest, and the cutting ability of the blade head 101 is the strongest. At this time, the distal end of the decomposition piece 1021 abuts against the distal end of the through slot 1013. The medical cutting assembly 10 in this state is suitable for cutting severe, coaxial calcified lesions; when the extended length is the smallest, the distal portion of the blade head 101 for cutting is the smallest, and the cutting ability of the blade head 101 is relatively weak. At this time, the proximal end of the decomposition piece 1021 abuts against the proximal end of the through slot 1013. The medical cutting assembly 10 in this state is suitable for cutting curved, irregular lesions. Therefore, the medical cutting assembly 10 in this embodiment has good adaptability to different actual situations.

[0061] In the first embodiment, the decomposition member 1021 includes a side surface 1022. When the cutter head 101 rotates to cut the excess tissue in the blood vessel, the tissue shredded by the cutter head 101 arrives at the through groove 1013 along the conveying groove 1012. At this time, the stopper 102 is relatively fixed, the cutter head 101 rotates, and the conveying groove 1012 rotates with the cutter head 101, which can not only drive the tissue in the conveying groove 1012 to rotate, but also drive the through groove 1013 to intersect and separate with the decomposition member 1021, that is, drive the side surface 1022 of the decomposition member 1021 to continuously enter and leave the conveying groove 1012. At this time, the tissue and the side surface 1022 of the decomposition member 1021 continuously collide and are cut after being dislocated, thereby being decomposed into smaller tissues, which is more conducive to the subsequent tissue transportation. In this embodiment, the side surface 1022 is set as a plane perpendicular to the proximal end surface or the distal end surface of the decomposition member 1021.

[0062] In another embodiment, the side surface 1022 is configured as an inclined surface inclined with respect to the proximal end surface or the distal end surface of the disassembly component 1021 .

[0063] In another embodiment, the side surface 1022 may also be configured as a non-planar surface. For example, the side surface 1022 may be configured as an arc surface or other uniform curved surface, or a portion of the side surface 1022 may be raised or recessed to form an irregular surface.

[0064] like Figure 5-6 As shown, Figure 5 is a schematic diagram of the operation of the distal end of the volume reduction catheter system in Example 1, Figure 6 1 is a working schematic diagram of the volume reduction catheter system in Example 1. The volume reduction catheter system 11 includes the above-mentioned medical cutting assembly 10 and a control assembly 12 for controlling the movement of the medical cutting assembly 10. The cutter head 101 is driven to rotate by the transmission shaft 1015, and the first sleeve 103 is rigidly connected to the stopper 102. In this embodiment, the first sleeve 103 and the stopper 102 are welded, the distal end of the transmission shaft 1015 passes through the stopper 102 and connects to the cutter head 101, and the proximal end of the transmission shaft 1015 is connected to the control assembly 12 outside the body. The control assembly 12 controls the movement of the cutter head 101 by controlling the movement of the transmission shaft 1015 to achieve cutting and transportation of tissue. The distal end of the cutter head 101 is partially exposed to achieve cutting of tissue, and the first sleeve 103 at least covers the through groove 1013 of the cutter head 101 to achieve radial limitation of the cutter head 101 and fully prevent the cut tissue transported by the cutter head 101 from leaving the conveying groove 1012 radially. After the exposed distal part of the blade head 101 cuts the tissue, the tissue to be transported moves toward the proximal end along the transport groove 1012, and when it reaches the through groove 1013, it is collided by the decomposition piece 1021 and decomposed into smaller tissues, and then continues to be transported toward the proximal end. Since the cut tissue is decomposed into smaller tissues again, it is conducive to fast and effective transportation, thereby improving the cutting and transportation efficiency as a whole.

[0065] When the extension length of the cutter head 101 needs to be adjusted, the current position of the limiter 102 is kept unchanged, and the axial position of the cutter head 101 is adjusted by adjusting the axial position of the transmission shaft 1015 connected to the proximal end of the cutter head 101.

[0066] Further, the surface of the transmission shaft 1015 is provided with a spirally extending transport groove 1016, and the transport groove 1016 can transport the micro-tissues decomposed by the collision of the decomposed parts 1021 to the proximal end of the transmission shaft 1015 until they are finally transported outside the body. In addition, the surface of the transmission shaft 1015 is sleeved with a second sleeve 1017, which plays the same protective role as the first sleeve 103. It should be understood that the first sleeve 103 and the second sleeve 1017 can be an integral structure, that is, they function as a complete sleeve. On the one hand, the second sleeve 1017 protects the blood vessels or external tissues where the transmission shaft 1015 is located, and on the other hand, prevents the micro-tissues to be transported from radially detaching from the volume reduction catheter system 11. The second sleeve 1017 is hot-melt connected to the proximal end of the stopper 102, and has an interference fit with the proximal end of the stopper 102.

[0067] The control assembly 12 includes a switch group 1210, a power group 1220, a transmission group 1230 and a separation seat 1240, wherein the power group 1220 and the transmission group 1230 are rigidly connected, and the transmission group 1230 includes a plurality of transmission combinations. In this embodiment, a gear group is selected as a transmission member, and the first end of the gear group is connected to the power group 1220, and the second end is connected to the transmission shaft 1015, and the gear group is dynamically sealed to the transmission shaft 1015. In general, the switch group 1210 controls the rotation of the transmission shaft 1015 through the transmission group 1230. Specifically, the transmission shaft 1015 is installed in the separation seat 1240.

[0068] The separation seat 1240 includes a first chamber 1241 and a second chamber 1242. The second chamber 1242 is connected to the drainage pipe 1243. The second sleeve 1017 is sleeved on the surface of the transmission shaft 1015. For the convenience of distinction, the cutting position of the blade head 101 of the volume reduction catheter system is the cutting section, the second sleeve 1017 and the part sleeved by the protection kit 1015 are the transportation section, and the part of the control component 12 is the collection section. The transportation section extends from the position of the cutting section blade head 101 to the first chamber 1241 of the collection section. At the proximal end of the transportation section, the proximal end of the second sleeve 1017 is sealed with the inner wall of the first chamber 1241, the transmission shaft 1015 continues to extend to the second chamber 1242, and the transportation groove 1016 on the surface of the transmission shaft 1015 also extends to the second chamber 1242, and the proximal end of the transmission shaft 1015 is sealed with the inner wall of the second chamber. Therefore, the tissue cut from the position of the blade head 101 of the cutting section will gradually enter the collecting section along the transport groove 1016. Specifically, the tissue gradually enters the first chamber 1241, then reaches the second chamber 1242, and finally is discharged to the collecting device or the outside world along the drainage pipe 1243.

[0069] In order to facilitate the processing of the transmission shaft 1015 and stabilize the structure after forming, the present embodiment uses a coil spring 1018 to be coiled on the surface of the transmission shaft 1015 to form a conveying groove 1016. On the one hand, the transmission shaft 1015 needs to be flexible to conform to the blood vessels, and the coil spring 1018 can strengthen the supporting function of the transmission shaft 1015, that is, strengthen the supporting function of the transmission shaft while ensuring that the transmission shaft 1015 can conform to the curvature of the blood vessels; on the other hand, since the coil spring 1018 is elastic, it can play a buffering role when the cutter head 101 rotates for cutting.

[0070] In this embodiment, a plurality of cleaning sections are also provided in the transport section. Figure 7-8 As shown, Figure 7 is a partial schematic diagram of the transport section of the volume reduction catheter system in Example 1, Figure 8 yes Figure 7 The cross-sectional schematic diagram at the AA position in the middle, the first clearing part 1023 is arranged in the conveying section, and the first clearing part 1023 includes a plurality of clearing parts 10231 extending along the inner wall of the second sleeve 1017 in the axial direction (the clearing parts 10231 here can be the same as the decomposition parts in this embodiment), and the shape of the clearing parts 10231 is not limited. When the conveying groove 1016 conveys the tissue to the position of the first clearing part 1023, due to the relative rotation of the transmission shaft 1015 and the second sleeve 1017, the tissue collides with the first clearing part 1023, thereby being decomposed into smaller parts. A plurality of first clearing parts 1023 are arranged axially along the upper edge of the conveying section, which can further fully decompose the tissue located in the conveying groove 1016, thereby facilitating the transportation of the cut tissue. For a specific first clearing part 1023, the more clearing parts 10231 distributed circumferentially it contains, the higher the decomposition efficiency of the first clearing part 1023.

[0071] In this embodiment, since the transport groove 1016 is formed by winding the coil spring 1018, in order to ensure that the first cleaning portion 1023 can fully contact the tissue transported by the transport groove 1016, the coil spring 1018 is set to a segmented structure, that is, the coil spring 1018 is disconnected at the position of the first cleaning portion 1023, thereby ensuring that the coil spring 1018 will not contact the transmission shaft 1015.

[0072] In order to enhance the decomposition capability of the first cleaning section 1023, a first filter 1019 with a filter screen is provided on the second sleeve 1017 at the proximal end of the first cleaning section 1023. When the tissue cut off by the cutter head is transported to the proximal end, it is easy to move along the protrusion of the first cleaning section 1023 without colliding with the first cleaning section 1023, which then causes the problem of insufficient decomposition. Therefore, the first filter 1019 is additionally provided near the cleaning member 1024, that is, the cleaning section 1023 includes a cleaning member 10231 and a first filter 1019 located at the proximal end of the cleaning member 10231. The first filter 1019 is fixed on the transmission shaft 1015 and moves together with the transmission shaft 1015. If the first filter 1019 is provided at the distal end of the first cleaning section 1023, the tissue cannot reach the position of the first cleaning section 1023. Therefore, the first filter 1019 is provided at the proximal side of the first cleaning section 1023. The specific working conditions are as follows:

[0073] The transmission shaft 1015 rotates at a high speed relative to the second sleeve 1017, the cleaning member 10231 is located on the inner wall of the second sleeve 1017, the first filter 1019 is fixed on the transmission shaft 1015 and is located on the proximal side of the cleaning member 10231, and there is a gap between the outer side of the first filter 1019 and the second sleeve 1017 to prevent excessive tissue from accumulating on the surface of the first filter 1019. As the transmission shaft 1015 rotates relative to the cleaning member 10231, a portion of the tissue that reaches the first cleaning portion 1023 is further cleaned by the cleaning member 1024, and another portion of the tissue continues to be transported to the transport section along the side and bottom of the cleaning member 10231, so it is not cleaned. At this time, under the action of the first filter 1019, part of the tissue that was not originally cleared is captured by the first filter 1019, and the cleaning member 1024 passes through the surface of the first filter 1019, and the side and bottom surfaces of the cleaning member 10231 collide and decompose the tissue captured by the first filter 1019, thereby achieving further decomposition, so that the cleaning effect of the first cleaning part 1023 is better.

[0074] When the filter area of ​​the first filter element 1019 is too large, it will affect the smooth flow of the liquid and cause the first filter element 1019 to rotate unstably. Therefore, there is a gap 1010 between the first filter element 1019 and the second sleeve 1015. Since some tissues will pass directly through the gap 1010 between the first filter element 1019 and the second sleeve 1015 without being cleared, Fig. 9 , a second clearing portion 1025 may be added at the proximal end of the first clearing portion 1023 . Fig. 91 is a working schematic diagram of the second cleaning unit 1025 in Example 1 of the present invention. The second cleaning unit 1025 includes a cleaning member 10241 and a second filter member 1020. The structure of the second filter member 1020 is different from that of the first filter member 1019. The second filter member 1020 is fixed to the transmission shaft 1015 through a plurality of connecting rods 1021. It is worth noting that the filter screen of the second filter member 1020 is close to the inner wall of the second sleeve 1017, that is, the tissue escaping from the gap 1010 of the first filter member 1019 will be captured by the second filter member 1020 and thus cleaned by the cleaning member 10241. A gap is left between the inner side of the surface filter screen of the second filter member 1020 and the transmission shaft 1015, which can prevent the tissue from accumulating on the filter screen surface and prevent the filter screen from being too large to affect the liquid circulation.

[0075] Furthermore, the radial thickness of the second filter element 1020 is less than or equal to the radial thickness of the cleaning element 10241, and the cleaning element 10241 can cover the entire surface of the second filter element 1020, thereby achieving sufficient decomposition of the tissue.

[0076] It is worth noting that, in fact, the relative positions of the first cleaning part 1023 and the second cleaning part 1024 may not be limited, that is, multiple first cleaning parts 1023 and second cleaning parts 1024 may be provided, but preferably, at least for the filter element located farthest from the proximal end, at least one cleaning part is provided at the distal end of the filter element.

[0077] In another embodiment, the coil spring 1018 still adopts a continuous structure, and a gap is left between the protrusion of the first cleaning portion 1023 and the coil spring 1018 .

[0078] In another embodiment, if Fig.10 As shown, Fig.10 It is a partial schematic diagram of the transport section of another volume reduction catheter system in Example 1 of the present invention. The transport groove 2016 of the transport section is a part of the transmission shaft 2015. The side wall 2027 of the transport groove 2016 extends spirally along the transmission shaft 2015. At the position of the cleaning piece 2023, the corresponding position of the side wall 2027 of the transmission shaft 1015 is provided with an avoidance groove 2028 to avoid the cleaning piece 2023. The avoidance groove 2028 penetrates the side wall 2027 and is distributed along the circumferential direction. When the avoidance groove 2028 of the transport groove 2016 overlaps with the cleaning piece 2023 in the radial direction, the avoidance groove 2028 accommodates the cleaning piece 2023, thereby avoiding the collision between the cleaning piece 2023 and the side wall 2027 of the transport groove 2016.

[0079] In another embodiment, the cutting head 101 of the volume reduction catheter system is driven by a transmission shaft 1015, and the second sleeve 1017 covers a portion of the proximal end of the cutting head 101 (i.e., the second sleeve 1017 extends to the position of the cutting head 101 instead of the limiter), and the second sleeve 1017 of the volume reduction catheter system is axially provided with a plurality of clearing portions, at least one of which is located at the proximal end of the cutting head 101.

[0080] Example 2

[0081] like Fig.11 As shown, Fig.11 It is a structural schematic diagram of the upper limit member of the medical cutting assembly in the volume reduction catheter system of Example 2. The parts of the volume reduction catheter system and the medical cutting assembly of Example 2 that are the same as those of the volume reduction catheter system and the medical cutting assembly of Example 1 will not be repeated here. In the previous embodiments, the limit member is rigidly connected to the first sleeve, that is, the limit member and the first sleeve function as a whole, and the limit member and the first sleeve can be formed into a whole by welding, integral molding, etc., or the structure of the limit member can be changed to replace the function of the first sleeve with a part of the limit member. The limit member in Example 2 sets the decomposition member 2021 to be located on the inner wall of the middle part of the limit member 202. After the limit member 202 is assembled with the cutter head, a part of the distal tube wall of the limit member 202 is at least sleeved on the outside of the proximal end of the cutter head. At this time, a part of the distal tube wall of the limit member 202 plays the same role as the first sleeve in the previous Example 1. The limit member 202 in Example 2 has undergone structural changes compared to the limit member in Example 1, thereby eliminating the design of the first sleeve, improving production efficiency and reducing process costs, and there is no need to consider processing issues such as whether the connection strength between the sleeve and the limit member is sufficient and whether the sealing is good.

[0082] In the subsequent improvement scheme based on Example 2, the term "first sleeve" refers to a portion of the distal tube wall of the limiting member 202 in this embodiment that plays the same role as the first sleeve.

[0083] Example 3

[0084] In Example 3, the connection method between the cutting head and the limit member is different from that in Example 1, and the setting of the sleeve is the same as that in Example 1. The parts of the volume reduction catheter system and medical cutting assembly of Example 3 that are the same as those of the volume reduction catheter system and medical cutting assembly of Example 1 are not repeated here.

[0085] like Figure 12-14 As shown, Fig.12 is an exploded schematic diagram of the medical cutting assembly in Example 3, Fig.13 is a schematic diagram of the installation of the cutter head and the limiter in the medical cutting assembly in Example 3, Fig.143 is a schematic diagram of the structure of the stopper of the medical cutting assembly in Example 3. In this embodiment, the medical cutting assembly 30 includes a coaxially assembled cutter head 301, a stopper 302 and a first sleeve 303. It should be clear that except for the change in the connection position structure between the cutter head 301 and the stopper 302, the other structures, functions and related expansion schemes in Example 3 that are not related to the connection position structure continue to use the contents of Example 1.

[0086] In Example 3, a conveying groove 3012 is formed between two adjacent blades 3011, and a plurality of through grooves 3013 are also provided at the proximal end of the cutting head 301. Each through groove 3013 circumferentially penetrates the cutting edge 3011 where it is located and is connected to the conveying groove 3012 adjacent to the cutting edge 3011. It should be noted that the through groove 3013 is located on the inner side of the proximal end of the cutting edge 3011, and the bottom surface 30131 of the through groove 3013 forms a step surface with the inner wall surface 30111 of the proximal end of the cutting edge 3011. The distance between the bottom surface 30131 of the through groove 3013 and the axis of the rotating shaft of the cutting head 301 is greater than the distance from the inner wall surface 30111 of the proximal end of the cutting edge 3011 to the axis of the rotating shaft of the cutting head 301.

[0087] The limiting member 302 includes a disassembly member 3021 and a connecting portion 3022 . The disassembly member 3021 is disposed at a position close to the end of the distal end of the connecting portion 3022 . The disassembly member 3021 protrudes outward from the outer wall of the connecting portion 3022 .

[0088] In this embodiment, in order to ensure that the disassembly component 3021 can be accommodated in the through groove 3013, in addition to meeting the relevant settings regarding the axial width in embodiment 1, the following two requirements need to be met:

[0089] First, the distance between the top surface 30211 of the disassembling member 3021 and the axis of the rotation shaft of the limiting member 302 is less than or equal to the distance between the bottom surface 30131 of the through slot 3013 and the axis of the rotation shaft of the cutter head 301;

[0090] Second, the distance between the inner wall surface 30111 at the proximal end of the blade 3011 and the axis of rotation of the cutter head 301 is greater than or equal to the distance between the surface 30221 of the connecting portion 3022 and the axis of rotation of the stopper 302. Since the cutter head 301 and the stopper 302 are coaxially arranged, the axis of rotation of the cutter head 301 and the axis of rotation of the stopper 302 are in the same straight line.

[0091] When the blade head 301 rotates, the decomposing element 3021 alternately enters the through slot 3013 and the conveying slot 1012, and the decomposing element 3021 collides with the tissue in the conveying slot 3012 and decomposes it into smaller tissues. In order to achieve a better decomposition effect, under the condition of meeting the above requirements, the distance from the top surface 30211 of the decomposing element 3021 to the axis of the rotation axis of the stopper 302 is greater than or equal to the distance from the inner wall surface 30111 of the proximal end of the blade 3011 to the axis of the rotation axis of the blade head 301.

[0092] In order to ensure that the drive shaft in the volume reduction catheter system of Example 3 can correctly drive the cutter head 301 to rotate, a channel 3023 running from the proximal end to the distal end is provided at the center of the limiter 302 to facilitate the insertion of the drive shaft.

[0093] In another embodiment, the tissue is transported through a transport cavity inside the cutting head. The transport cavity is a cavity arranged inside the cutting head. The transport cavity includes an input port located at the distal end of the cutting head and an output port located at the proximal end of the cutting head. The output port is close to the through slot. The tissue cut off by the distal end of the cutting head enters the transport cavity from the input port and leaves the transport cavity from the output port. When it reaches the through slot position, it collides with the decomposition component structure and is further decomposed.

[0094] Furthermore, a delivery groove structure as in Example 1 may be provided inside the delivery cavity to facilitate the transportation of tissues.

[0095] Example 4

[0096] Based on Examples 1-3, in order to increase the decomposition efficiency of the medical cutting assembly, a decomposition groove may be provided on the inner wall of the sleeve (including the first sleeve and the second sleeve). When the cutting head and the sleeve rotate relative to each other, the excess tissue transported in the transport groove collides with the side wall of the decomposition groove to achieve further decomposition. The larger the side wall area of ​​the decomposition groove, the higher the decomposition efficiency. For a decomposition groove of a fixed shape, when the decomposition groove passes through the tube wall of the sleeve to form a window, the decomposition efficiency of the entire medical cutting assembly is improved to the highest level.

[0097] like Fig.15 As shown, Fig.154 is a schematic diagram of the structure of the distal end of the volume reduction catheter system in Example 5. The same parts of the volume reduction catheter system and the medical cutting assembly in Example 4 as those in Examples 1-4 are not repeated here. The main improvement of Example 4 is that a decomposition groove is added to the first sleeve 403 of the medical cutting assembly in Example 4. The decomposition groove needs to be connected with the conveying groove (or conveying cavity) at least at a certain time, so that the tissue in the conveying groove (or conveying cavity) can enter the decomposition groove and collide with the inner wall of the decomposition groove to achieve further decomposition. In order to achieve a better effect, the decomposition groove in Example 4 penetrates the wall of the first sleeve 403 to form a first window 4031. The first window 4031 can improve the decomposition efficiency of the window position to a certain extent. Specifically, when the cutter head 401 rotates at a high speed, a part of the cut tissue in the conveying groove (or conveying cavity) will collide with the side wall of the first window 4031, thereby being further decomposed.

[0098] Since the first window 4031 is very small relative to the entire surface of the first sleeve 403 and the gap between the outer surface of the first sleeve 403 and the inner wall of the blood vessel is small, when the cutting head 401 rotates at high speed, almost no tissue to be transported proximally will leave the medical cutting assembly through the first window 4031.

[0099] In order to obtain a better decomposition effect, the first window 4031 is arranged so that at least one decomposition component is located between the distal end and the proximal end of the first window 4031 in the axial direction. The reason is that the blade head and the limiter in the medical cutting assembly rotate relative to each other, driving the conveying slot and the decomposition component to rotate relative to each other, and the decomposition component collides with the excess tissue in the conveying slot in the circumferential direction, causing the excess tissue in the conveying slot to be displaced and sent for further decomposition, and a part of the displaced excess tissue collides with the inner wall of the first window 4031 again, thereby causing further decomposition, that is, when the decomposition component passes through the conveying slot, it drives the excess tissue in the conveying slot to collide with the side wall of the first window 4031, so that the decomposition effect of the first window 4031 at this position is the best.

[0100] Example 6

[0101] like Fig.16 As shown, Fig.16: is a schematic diagram of the structure of the distal end of the volume reduction catheter system in Example 6. The volume reduction catheter system and the medical cutting assembly in Example 6 are improved based on Example 5. The same parts of the volume reduction catheter system and the medical cutting assembly in Example 6 and the volume reduction catheter system and the medical cutting assembly in Example 5 are not repeated here. The main difference between the two is that the medical cutting assembly in Example 3 is further added with a decomposition groove on the basis of Example 5. Similarly, the decomposition groove penetrates the tube wall of the first sleeve 503 to form a second window 5032. The original first window is located on the back of the second window 5032 and is therefore not shown. The second window 5032 is located at the distal end of the first sleeve 503. The side wall of the second window 5032 collides with the cut tissue located inside the distal end of the first sleeve 503. These tissues are further decomposed into smaller tissues, thereby improving the decomposition efficiency of the medical cutting assembly at the distal end of the first sleeve 503.

[0102] Embodiment 6 is an improvement based on the design of a single decomposition groove in Embodiment 5, that is, Embodiment 6 adds a decomposition groove at a position different from the decomposition groove in Embodiment 5 on the stopper to improve the decomposition efficiency at different positions, thereby improving the overall decomposition efficiency of the medical cutting assembly. Therefore, based on this idea, the embodiment in which multiple decomposition grooves are provided on the stopper should be regarded as an embodiment equivalent to Embodiment 5 or 6. In addition, in embodiments such as Embodiment 5 and Embodiment 6 in which decomposition grooves are added to the medical cutting assembly, the specific shape and number of the decomposition grooves are not limited. In order to obtain a better decomposition effect, at least one decomposition member is located between the proximal end and the distal end of one of the decomposition grooves along the axial direction of the stopper.

[0103] It should be noted that the decomposition groove can also be used in the transport section. The difference from Examples 5-6 is that in order to ensure reliable transportation of the cut tissue by the transport section, the decomposition groove cannot penetrate the outer wall of the second sleeve of the transport section.

[0104] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0105] The embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.

Claims

1. A volume reduction catheter system, comprising a cutting section and a conveying section arranged in series, wherein the cutting section comprises a cutting assembly, and the conveying section comprises a transmission shaft fixedly connected to the cutting assembly and a sleeve sleeved on the surface of the transmission shaft, wherein the transmission shaft is controlled by a control assembly so as to rotate relative to the sleeve, characterized in that: The transmission shaft is provided with a conveying groove, the inner wall of the sleeve is provided with a clearing portion, the clearing portion includes a disassembly component extending toward the transmission shaft, the cutting assembly includes a cutter head, the cutter head includes a plurality of blades extending from the proximal end to the distal end, a conveying groove is formed between two adjacent blades, at least one of the blades is provided with a through groove, the through groove is connected to the conveying groove adjacent to the blade, and when the transmission shaft and the sleeve rotate relative to each other, the disassembly component passes through the conveying groove multiple times.

2. The volume reduction catheter system according to claim 1, characterized in that: The sleeve covers the proximal end of the cutting assembly, and the clearing portion is provided at the position where the sleeve covers the cutting assembly.

3. The volume reduction catheter system according to claim 2, characterized in that: There are one or more disassembly parts, and during the rotation of the cutter head, at least a part of one of the disassembly parts is always located in one of the through grooves to limit the axial position of the cutter head.

4. The volume reduction catheter system according to claim 2, characterized in that: The number of the disassembly components is at least two, and at least two of the disassembly components are arranged at intervals along the circumferential direction or the axial direction of the sleeve.

5. The volume reduction catheter system according to claim 2, characterized in that: The blade extends in a spiral shape from the proximal end to the distal end, and the helical angle of the conveying groove gradually decreases from the distal end to the proximal end.

6. The volume reduction catheter system according to claim 2, characterized in that: The axial width of the disassembly component is smaller than the axial width of the through slot, and the axial position of the proximal end of the disassembly component relative to the proximal end of the through slot is adjustable.

7. The volume reduction catheter system according to claim 1, characterized in that: The conveying groove is formed by winding a linear body on the surface of the transmission shaft, and a gap is left between the decomposition component and the linear body in the radial direction.

8. The volume reduction catheter system according to claim 7, characterized in that: There are a plurality of linear bodies, and the decomposition component is located between two adjacent linear bodies, with a gap between the decomposition component and the surface of the transmission shaft in a radial direction.

9. The volume reduction catheter system according to claim 1, characterized in that: The conveying groove is a part of the transmission shaft, and the side wall of the conveying groove extends spirally along the transmission shaft. The side wall is provided with an avoidance groove for avoiding the disassembly component at a position of the transmission shaft corresponding to the disassembly component. When the transmission shaft moves relative to the sleeve, the disassembly component can freely pass through the avoidance groove.

10. The volume reduction catheter system according to claim 1, characterized in that: The sleeve is provided with a plurality of decomposition grooves. When the sleeve and the transmission shaft rotate relative to each other, the decomposition grooves are connected with the conveying groove at least at a certain moment.

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