Rotary-cut catheter used in blood vessel

Abstract

The rotary cutting catheter comprises an inner catheter body, an outer catheter body, a rotary cutting tool and a driving assembly, and the inner catheter body is provided with a first channel; the outer tube fixedly sleeves the inner catheter, the near end of the inner catheter extends out of the near end of the outer tube, the outer tube is provided with a second channel, and the side wall of the far end of the outer tube is provided with an open slot consistent with the extending direction of the second channel; the rotary cutting tool comprises a transmission shaft and an arc-shaped blade, the transmission shaft is rotatably inserted in the second channel, the arc-shaped blade is inserted in the open groove and fixedly connected with the transmission shaft, the circle center of the arc-shaped blade and the axis of the transmission shaft are located on the same side of the arc-shaped blade, and the rotary cutting blade has a folded state and an unfolded state. When the rotary cutting blade is in the folded state, the rotary cutting blade is wound on the transmission shaft, and when the rotary cutting blade is in the unfolded state, part of the rotary cutting blade extends out of the guide pipe from the open groove; the driving assembly is arranged at the near ends of the inner catheter and the transmission shaft and can drive the transmission shaft to rotate.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a rotary cutting catheter used in a blood vessel. Background Art

[0002] At present, the clinical treatment of stenosis in the carotid artery or other peripheral blood vessels caused by embolic lesions and carotid plaque sclerosis is usually carried out by drug thrombolysis, mechanical thrombectomy and release of carotid stents. Due to the many complications of drug thrombolysis, it is more common to use mechanical thrombectomy to remove atherosclerosis, thrombus, etc. in the blood vessels through intravascular cutting tools. The intravascular cutting tools currently available on the market often face problems such as low efficiency, complex operation, and great damage to the blood vessel wall when dealing with narrow or completely occluded blood vessels. After entering the narrow area, it is often impossible to achieve effective and precise cutting, which increases the difficulty and risk of surgery. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of rotary cutting catheter, which has high cutting efficiency, precision and simple operation, and is particularly suitable for use in narrow or completely occluded blood vessels, and is efficient and safe.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A rotary cutting catheter used in a blood vessel comprises an inner catheter, an outer tube, a rotary cutting cutter and a driving component.

[0006] The inner catheter is provided with a first channel with both ends open, extending from its distal end to its proximal end, and the first channel is used for the guide wire to pass through; the outer tube is fixedly sleeved on the outside of the inner catheter, the proximal end of the inner catheter extends out of the proximal end of the outer tube, and the outer tube is provided with a second channel extending from a portion close to its distal end to its proximal end, and an open groove consistent with the extension direction of the second channel is provided on the side wall of the distal end of the outer tube, and the open groove is connected to the second channel; the rotary cutting tool includes a transmission shaft and an arc-shaped blade, the transmission shaft is rotatably inserted in the second channel, the arc-shaped blade is inserted in the open groove, the arc-shaped blade is fixedly connected to the transmission shaft, and the center of the arc-shaped blade and the axis of the transmission shaft are located in the arc On the same side of the arc-shaped blade, the rotary cutting blade has a specific storage state and an expanded state. When the rotary cutting blade is in the storage state, the rotary cutting blade is wound around the transmission shaft. When the rotary cutting blade is in the expanded state, part of the rotary cutting blade extends from the opening slot to the outside of the catheter. The driving assembly is arranged at the proximal end of the inner catheter and the transmission shaft, and the driving assembly can drive the transmission shaft to rotate. When the transmission shaft rotates along a first direction, the arc-shaped blade is gradually wound around and stored on the transmission shaft. When the transmission shaft rotates along a second direction, the arc-shaped blade is gradually expanded and extends from the opening slot. One of the first direction and the second direction is a clockwise direction, and the other is a counterclockwise direction.

[0007] In an embodiment of the present invention, the arc-shaped blade extends from the distal end of the opening slot to its proximal end, and when the rotary cutting blade is in the expanded state, the radius of the arc-shaped blade gradually increases from the distal end of the opening slot to its proximal end.

[0008] In an embodiment of the present invention, a plurality of the second channels and a plurality of the rotary cutting tools are arranged at intervals along the circumference of the conduit, and each of the second channels corresponds to one of the rotary cutting tools.

[0009] Furthermore, when the arc-shaped blades of the multiple rotary cutting tools are in the expanded state, the portion of each arc-shaped blade extending out of the opening slot extends outward from the opening slot in a counterclockwise direction, or the portion of each arc-shaped blade extending out of the opening slot extends outward from the opening slot in a counterclockwise direction.

[0010] The blade in the present invention is in an arc shape, arranged and partially curled on the transmission shaft. When the transmission shaft rotates, the blade rotates and unfolds, and the blade extends from the open groove at the far end of the outer tube. The far end of the outer tube is roughly conical as a whole, and the conical cutting formed can efficiently cut diseased tissue.

[0011] According to some embodiments of the present invention, the number of the second channels and the number of the rotary cutting tools are 2 to 5, for example, 2, 3, 4 or 5.

[0012] Further, the first channel is coaxial with the inner conduit, and the plurality of second channels are distributed at equal intervals along the periphery of the first channel.

[0013] Preferably, a marking ring for positioning is provided on the surface of the outer tube.

[0014] In the embodiment of the present invention, the rotary cutting blade is made of metal or alloy.

[0015] In the embodiment of the present invention, the surface of the rotary cutting blade is passivated.

[0016] In an embodiment of the present invention, a coating is provided on the surface of the rotary cutting blade to enhance its corrosion resistance and biocompatibility.

[0017] In an embodiment of the present application, the intravascular rotary cutting catheter includes a handle which is sleeved on the proximal end of the inner catheter and detachably connected to the proximal end of the outer tube, the driving component is arranged on the handle, and the driving component includes an annular paddle wheel which can rotate around its own axis, a transmission gear which is relatively meshed and fixedly connected to the inner surface of the annular paddle wheel, and a limit gear which is relatively meshed and fixedly connected to the outer surface of the transmission gear, the limit gear, the annular paddle wheel and the inner catheter are coaxial, the limit gear can rotate around its own axis driven by the annular paddle wheel and the transmission gear, and the transmission gear is fixedly connected to the transmission shaft.

[0018] Furthermore, a plurality of the second channels and a plurality of the rotary cutting tools are arranged at intervals along the circumference of the inner conduit, each of the second channels corresponds to a rotary cutting tool, and a plurality of the transmission gears are arranged at corresponding intervals along the axial direction of the limit gear in the annular thumbwheel.

[0019] Furthermore, the annular dial is rotatably clamped on the handle, and the handle is provided with a fixed shaft fixedly sleeved on the proximal end of the inner catheter, the limit gear is rotatably sleeved on the fixed shaft, the transmission shaft extends to the interior of the handle, and the distal end of the transmission shaft is fixedly connected to the transmission gear.

[0020] The present invention provides a manually operated rotary cutting catheter, which controls the deployment and retraction of the blade by manually operating the gear system to drive the transmission shaft to rotate, thereby ensuring simple and accurate operation while avoiding the complexity and cost increase caused by the use of an electric system.

[0021] According to a preferred embodiment of the present invention, the inner catheter and the outer tube are made of nylon 12, the handle is made of polycarbonate (PC), which has high strength and flexibility, the rotary cutting blade is made of titanium alloy Ti-6Al-4V, the transmission shaft is made of 304 stainless steel, and the drive assembly is made of 304 stainless steel. By using high-performance materials, the durability and biocompatibility of the catheter and the blade are improved to ensure that healthy tissue is not damaged during surgery. The present invention provides reliable operating performance through unique design and material selection, and improves the efficiency and safety of surgery.

[0022] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0023] The rotary cutting catheter of the present invention is mainly used for the treatment of stenosis or complete occlusion lesions in peripheral blood vessels, and is particularly suitable for complex thrombosis blockage situations. It can significantly improve the cutting efficiency and accuracy of intravascular surgery, reduce operation time and damage to blood vessel walls, and improve the patient's surgical success rate and postoperative recovery effect, providing an efficient and safe treatment plan. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] It should be noted that in order to fully display the structure in the drawings, the proportional relationship in the drawings has been adaptively adjusted, but it does not represent the proportional relationship of the structures of the various parts in actual use, or use the proportional relationship in the drawings as a factor to limit the scope of protection of the present invention.

[0026] Figure 1 Schematic diagram of the overall structure of the rotary cutting catheter of Example 1;

[0027] Figure 2 Schematic diagram of the main structure of the rotary cutting catheter of Example 1;

[0028] Figure 3 is a schematic diagram of the three-dimensional structure of the distal end of the rotary cutting catheter of Example 1;

[0029] Figure 4 is a schematic diagram of the front view of the distal end of the rotary cutting catheter of Example 1;

[0030] Figure 5 For along Figure 4 Schematic diagram of the cross-sectional structure of AA;

[0031] Figure 6 for Figure 5 Schematic diagram of the structure of the middle and outer tubes;

[0032] Figure 7 It is a schematic diagram of the distal three-dimensional structure of the rotary cutting tool in the rotary cutting catheter of Example 1;

[0033] Figure 8 Schematic diagram of the structure of the proximal end of the rotary cutting catheter of Example 1 (part of the handle housing is hidden);

[0034] Fig. 9 Schematic diagram of the structure of the proximal end of the rotary cutting catheter of Example 1 (partially showing the cross section);

[0035] Fig.10 Schematic diagram of the structure of the proximal end of the rotary cutting catheter of Example 1 (partially showing the cross section, showing the guide wire);

[0036] Fig.11 The schematic diagram of the drive assembly is shown in Figure 1.

[0037] In the above figure: 1, inner catheter; 11, first channel; 2, outer tube; 21, second channel; 22, opening slot; 31, transmission shaft; 32, arc-shaped blade; 41, annular dial; 42, transmission gear; 43, limit gear; 44, fixed shaft; 5, handle; 6, guide wire. DETAILED DESCRIPTION

[0038] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0039] In the description of the present invention, it is necessary to understand that the distal end refers to the end of the instrument or component away from the operator, and the proximal end refers to the end of the instrument or component close to the operator; the axial direction refers to the direction parallel to the line connecting the distal and proximal centers of the instrument or component, and the radial direction refers to the direction perpendicular to the axial direction; the inner and outer are positions defined by the distance relative to the center of the instrument or component, wherein the inner is a position close to the center of the instrument or component, and the outer is a position far from the center of the instrument or component. The description of the above-mentioned directional words is only for the convenience of describing the embodiments of 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 on the embodiments of the present invention.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, a plurality refers to two or more.

[0042] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] This embodiment provides a preferred embodiment of the rotary cutting catheter for use in a blood vessel of the present invention. Figures 1 to 11 As shown, the rotary cutting catheter includes an inner catheter 1, an outer tube 2, a rotary cutting tool, a driving assembly and a handle 5.

[0045] Specifically, the inner catheter 1 is provided with a first channel 11 extending from the distal end to the proximal end thereof and open at both ends, the first channel 11 is used for the guide wire to pass through, and the first channel 11 is coaxial with the inner catheter 1. In this embodiment, the inner catheter 1 is made of nylon 12.

[0046] Specifically, the outer tube 2 is fixedly sleeved on the outside of the inner catheter 1, the proximal end of the inner catheter 1 extends out of the proximal end of the outer tube 2, and the outer tube 2 is provided with a second channel 21 extending from a portion close to its distal end to its proximal end. An open groove 22 is provided on the side wall of the distal end of the outer tube 2 in the same direction as the extension of the second channel 21, and the open groove 22 is connected to the second channel 21. In this embodiment, the material of the outer tube 2 is nylon 12. In this embodiment, the number of the second channel 21 and the number of the open groove 22 are respectively 3, which are arranged equidistantly along the circumference of the inner catheter 1. In this embodiment, a marking ring for positioning is provided on the surface of the outer tube 2.

[0047] Specifically, the rotary cutting tool includes a transmission shaft 31 and an arc-shaped blade 32, the transmission shaft 31 is rotatably inserted in the second channel 21, the arc-shaped blade 32 is inserted in the opening slot 22, the arc-shaped blade 32 is fixedly connected to the transmission shaft 31, and the center of the arc-shaped blade 32 and the axis of the transmission shaft 31 are located on the same side of the arc-shaped blade 32. In this embodiment, the number of rotary cutting tools is 3, and one rotary cutting tool is correspondingly arranged in each second channel 21. In this embodiment, the rotary cutting blade has a specific storage state and an expanded state. When the rotary cutting blade is in the storage state, the rotary cutting blade is wound around the transmission shaft 31. When the rotary cutting blade is in the expanded state, part of the rotary cutting blade extends from the opening slot 22 to the outside of the catheter. The driving component is arranged at the proximal end of the inner catheter 1 and the transmission shaft 31. The driving component can drive the transmission shaft 31 to rotate. When the transmission shaft 31 rotates in a counterclockwise direction, the arc-shaped blade 32 is gradually wound around and stored on the transmission shaft 31. When the transmission shaft 31 rotates in a clockwise direction, the arc-shaped blade 32 is gradually expanded and extends from the opening slot 22. In this embodiment, the arc blade 32 extends from the distal end of the opening slot 22 to its proximal end, and when the rotary cutting blade is in the unfolded state, the radius of the arc blade 32 gradually increases from the distal end of the opening slot 22 to the proximal end thereof, and when the arc blade 32 of the rotary cutting tool is in the unfolded state, the portion of each arc blade 32 extending out of the opening slot 22 extends outward from the opening slot 22 in a clockwise direction, so that the distal end of the outer tube 2 is generally conical as a whole. In this embodiment, the rotary cutting blade is made of titanium alloy Ti-6Al-4V, and the transmission shaft 31 is made of 304 stainless steel.

[0048] Specifically, the handle 5 is sleeved on the proximal end of the inner catheter 1 and is detachably connected to the proximal end of the outer tube 2. The driving component is arranged on the handle 5. The driving component includes an annular paddle wheel 41 that can rotate around its own axis, a transmission gear 42 that is relatively meshed and fixedly connected to the inner surface of the annular paddle wheel 41, and a limit gear 43 that is relatively meshed and fixedly connected to the outer surface of the transmission gear 42. The limit gear 43, the annular paddle wheel 41 and the inner catheter 1 are coaxial. The limit gear 43 can rotate around its own axis driven by the annular paddle wheel 41 and the transmission gear 42. The transmission gear 42 is fixedly connected to the transmission shaft 31. In this embodiment, three transmission gears 42 are arranged in the annular paddle wheel 41 at corresponding intervals along the axial direction of the limit gear 43, and each transmission gear 42 is correspondingly connected to one transmission shaft 31. In this embodiment, the annular dial 41 is rotatably clamped on the handle 5, and a fixed shaft 44 is fixedly sleeved on the proximal end of the inner catheter 1 in the handle 5, and the limit gear 43 is rotatably sleeved on the fixed shaft 44. The transmission shaft 31 extends to the inside of the handle 5, and the distal end of the transmission shaft 31 is fixedly connected to the transmission gear 42. In this embodiment, the handle 5 is made of polycarbonate.

[0049] In this embodiment, the rotary cutting blade is unfolded by operating the annular dial wheel 41 at the handle 5, and the rotary cutting tool at the distal end of the rotary cutting catheter cuts the diseased tissue. For thrombi that are difficult to cut, the entire rotary cutting catheter can be rotated to drive the tool at the distal end of the rotary cutting catheter to rotate and cut. The tapered structure design formed after unfolding facilitates the blade to enter the narrow area or the part of the embolism with special shapes for precise cutting. The rotary cutting catheter of this embodiment can reduce the operation time and damage to the blood vessel wall, and improve the patient's operation success rate and postoperative recovery effect.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary cutting catheter for use in a blood vessel, characterized in that: The rotary cutting catheter comprises: An inner catheter, wherein the inner catheter is provided with a first channel extending from a distal end to a proximal end thereof and open at both ends, wherein the first channel is used for a guide wire to pass through; An outer tube, wherein the outer tube is fixedly sleeved on the outside of the inner catheter, the proximal end of the inner catheter extends out of the proximal end of the outer tube, the outer tube is provided with a second channel extending from a portion close to its distal end to its proximal end, and an open groove is provided on the side wall of the distal end of the outer tube in the same direction as the extension direction of the second channel, and the open groove is connected to the second channel; A rotary cutting tool, comprising a transmission shaft and an arc-shaped blade, wherein the transmission shaft is rotatably inserted in the second channel, the arc-shaped blade is inserted in the open slot, the arc-shaped blade is fixedly connected to the transmission shaft, the center of the arc-shaped blade and the axis of the transmission shaft are located on the same side of the arc-shaped blade, and the rotary cutting blade has a specific storage state and an expanded state. When the rotary cutting blade is in the storage state, the rotary cutting blade is wound around the transmission shaft, and when the rotary cutting blade is in the expanded state, a portion of the rotary cutting blade extends from the open slot to the outside of the conduit; A drive assembly is arranged at the proximal end of the inner catheter and the transmission shaft, and the drive assembly can drive the transmission shaft to rotate. When the transmission shaft rotates along a first direction, the arc-shaped blade is gradually wound around and stored on the transmission shaft. When the transmission shaft rotates along a second direction, the arc-shaped blade is gradually unfolded and extends from the open slot. One of the first direction and the second direction is a clockwise direction, and the other is a counterclockwise direction.

2. The rotary cutting catheter for use in a blood vessel according to claim 1, characterized in that: The arc-shaped blade extends from the distal end of the opening slot to the proximal end thereof, and when the rotary cutting blade is in the expanded state, the radius of the arc-shaped blade gradually increases from the distal end of the opening slot to the proximal end thereof.

3. The rotary cutting catheter for use in a blood vessel according to claim 2, characterized in that: A plurality of the second channels and a plurality of the rotary cutting tools are arranged at intervals along the circumference of the conduit, and each of the second channels corresponds to one of the rotary cutting tools.

4. The rotary cutting catheter for use in a blood vessel according to claim 3, characterized in that: When the arc-shaped blades of the multiple rotary cutting tools are in the expanded state, the portion of each arc-shaped blade extending out of the opening slot extends outward from the opening slot in a counterclockwise direction, or the portion of each arc-shaped blade extending out of the opening slot extends outward from the opening slot in a counterclockwise direction.

5. The rotary cutting catheter for use in a blood vessel according to claim 3, characterized in that: The number of the second channels and the number of the rotary cutting tools are 2 to 5 respectively.

6. The rotary cutting catheter for use in a blood vessel according to claim 3, characterized in that: The first channel is coaxial with the inner conduit, and the plurality of second channels are equidistantly spaced along the circumference of the first channel.

7. The rotary cutting catheter for use in a blood vessel according to claim 1, characterized in that: The rotary cutting blade is made of metal or alloy, and / or the surface of the rotary cutting blade is passivated.

8. The rotary cutting catheter for use in a blood vessel according to claim 1, characterized in that: The intravascular rotary cutting catheter comprises a handle which is sleeved on the proximal end of the inner catheter and detachably connected to the proximal end of the outer tube, the driving component is arranged on the handle, the driving component comprises an annular paddle wheel which can rotate around its own axis, a transmission gear which is relatively meshed and fixedly connected to the inner surface of the annular paddle wheel, and a limit gear which is relatively meshed and fixedly connected to the outer surface of the transmission gear, the limit gear, the annular paddle wheel and the inner catheter are coaxial, the limit gear can rotate around its own axis driven by the annular paddle wheel and the transmission gear, and the transmission gear is fixedly connected to the transmission shaft.

9. The rotary cutting catheter for use in a blood vessel according to claim 8, characterized in that: A plurality of the second channels and a plurality of the rotary cutting tools are arranged at intervals along the circumference of the inner conduit, each of the second channels corresponds to one of the rotary cutting tools, and a plurality of the transmission gears are arranged at corresponding intervals along the axial direction of the limiting gear in the annular thumbwheel.

10. The rotary cutting catheter for use in a blood vessel according to claim 8, characterized in that: The annular thumbwheel is rotatably clamped on the handle, and the handle is provided with a fixed shaft fixedly sleeved on the proximal end of the inner catheter, the limit gear is rotatably sleeved on the fixed shaft, the transmission shaft extends to the interior of the handle, and the distal end of the transmission shaft is fixedly connected to the transmission gear.

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