An adjustable rotary cutting device

Abstract

This utility model relates to an adjustable rotary cutting device, belonging to the field of medical device technology. It includes: a sheath with a release port; a catheter slidably disposed within the sheath, the catheter having an adjustable first bend and a second bend, the catheter extending from the release port through the first and second bends of the sheath; and a rotary cutting blade disposed on the second bend. Adjusting the first and second bends allows the rotary cutting blade to adhere closely to the plaque to be cut. Rotating the catheter causes the rotary cutting blade to rotate along the central axis of the sheath. The two bends enable high-precision control of the catheter, resulting in more thorough contact with the plaque.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and specifically relates to an adjustable rotary cutting device. Background Technology

[0002] Arteriovenous fistulas (AVFs) are a lifeline for patients with end-stage renal disease. They are artificial arteriovenous fistulas formed by connecting the arteries and veins in the arm to provide sufficient blood flow for dialysis treatment. In patients with renal disease, AVFs can become narrowed or acutely blocked due to long-term dialysis punctures and hypercoagulable states of the blood. Currently, blocked blood vessels can be cleared through surgical procedures and revascularization.

[0003] Surgical procedures can thoroughly remove plaques or thrombi causing vascular stenosis by opening blood vessels, but the large invasive area may affect dialysis for a period of time. Revascularization, primarily using PTA (percutaneous transluminal angioplasty), involves inflating a balloon to widen the narrowed area and restore blood flow without interfering with immediate dialysis. For intravascular thrombi, a balloon is used to create an opening at an unconventional puncture site to remove them from the blood vessel. Balloon dilation is less effective for stubborn plaques because blood vessels have some elasticity and are prone to recoil after dilation, thus providing limited improvement in blood flow for patients with plaque stenosis.

[0004] Existing technologies, including materials and design, aim to fundamentally remove plaques from blood vessels and address the issue of their actual existence. By peeling and aspirating the plaques, they can be removed from the blood vessels to increase blood flow and maintain arteriovenous fistula access. However, there is a lack of control over the contact angle of the cutting tools used to remove the plaques. Utility Model Content

[0005] This invention provides an adjustable rotary cutting device to solve the technical problem of lacking control over the contact angle of the cutting tool on the patch to be cut in the prior art.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An adjustable rotary cutting device includes: a sheath with a release port; a guide tube slidably disposed within the sheath, the guide tube having an adjustable first bend and a second bend, the guide tube extending the first bend and the second bend from the release port out of the sheath; and a rotary cutting blade disposed on the second bend. By adjusting the first bend and the second bend, the rotary cutting blade is adjusted to be in close contact with the patch to be rotary cut. By rotating the guide tube, the rotary cutting blade rotates along the central axis of the sheath.

[0008] Furthermore, the rotary cutting blade includes: an outer rotary cutting blade, which is fixedly installed on the second bent portion, and the edge of the outer rotary cutting blade is provided with a first cutting tooth; and an inner rotary cutting blade, on which the outer rotary cutting blade is provided with a locking groove, and the inner rotary cutting blade is locked and installed inside the outer rotary cutting blade, and the edge of the inner rotary cutting blade is provided with a second cutting tooth.

[0009] Furthermore, it also includes: a guide wire, wherein the head of the rotary cutting outer blade is provided with a guide hole, and the guide wire passes through the guide hole;

[0010] Furthermore, it also includes: a soft plug disposed within the catheter, the soft plug moving along the guidewire within the catheter.

[0011] Furthermore, it also includes: a winding unit connected to the first adjusting thread and the second adjusting thread; and a suction unit connected to the guide tube.

[0012] Furthermore, both the first bending portion and the second bending portion are provided with a sodium hydroxide tube structure, and correspondingly provided with a first adjusting wire and a second adjusting wire. The first adjusting wire corresponds to the first bending portion, and the second adjusting wire corresponds to the second bending portion, so as to adjust the bending angle of the first bending portion and the second bending portion respectively.

[0013] Furthermore, the first adjusting wire has control in at least two relative directions. The specific bending angle of the first bending section is controlled by tightening and loosening the two directions respectively through the winding unit, and the angle is maintained by the locking structure. The corresponding second adjusting wire has the same layout.

[0014] Furthermore, the catheter has a multi-layer composite structure, with a smooth coating on the inner layer and hydrophilic coatings on both the inner and outer layers. Anti-slip textures are provided on the outer layer of the catheter in the portion outside the blood vessel.

[0015] This utility model provides an adjustable rotary cutting device, which has the following advantages:

[0016] The two bends enable high-precision control of the catheter, resulting in more thorough contact with the plaque. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1A schematic diagram of the structure of an adjustable rotary cutting device provided in an embodiment of the present invention, showing the catheter located inside a sheath;

[0019] Figure 2 A schematic diagram of the structure of an adjustable rotary cutting device provided in an embodiment of the present invention, wherein the catheter is located outside the sheath;

[0020] Figure 3 This is a schematic diagram of the installation structure of the soft plug and guide wire of an adjustable rotary cutting device provided in an embodiment of the present invention.

[0021] In the diagram: 10-Sheath; 11-Release port; 20-Catheter; 21-First bend; 22-Second bend; 23-Rotating cutter; 31-Guide wire; 32-Rewinding unit; 33-First adjusting wire; 34-Second adjusting wire; 35-Soft plug. Detailed Implementation

[0022] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0023] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Example 1:

[0027] like Figures 1 to 3As shown, this embodiment provides an adjustable rotary cutting device, which includes: a sheath 10 with a release port 11; a guide tube 20 slidably disposed within the sheath 10, the guide tube 20 having an adjustable first bend 21 and a second bend 22, the guide tube 20 extending the first bend 21 and the second bend 22 from the release port 11; and a rotary cutting blade 23 disposed on the second bend 22. By adjusting the first bend 21 and the second bend 22, the rotary cutting blade 23 is adjusted to be in close contact with the patch to be rotary cut. By rotating the guide tube 20, the rotary cutting blade 23 rotates along the central axis of the sheath 10.

[0028] In this embodiment, the sheath 10 is made of medical-grade stainless steel or polymer material, with a smooth inner wall to reduce the sliding resistance of the catheter 20. The release port 11 is elliptical, and its size is adapted to the unfolded state of the first bend 21 and the second bend 22. The catheter 20 has a multi-layer composite structure, with a smooth inner coating to reduce blood adhesion, and both the inner and outer layers have hydrophilic coatings. Anti-slip textures are provided on the outer layer of the catheter 20 outside the blood vessel. The first bend 21 and the second bend 22 are wrapped with a medical-grade silicone protective layer, which can achieve a bending angle adjustment of 0-90°. The two bends are distributed front to back. The first bend 21 is located at the front end of the catheter 20 near the release port 11, and is mainly used to adjust the guiding direction of the front end of the catheter 20. The second bend 22 is located adjacent to the rotary cutter 23, and the wall pressure of the rotary cutter 23 is precisely controlled by the angle change. During operation, the device is first delivered to the diseased blood vessel through the sheath 10, and then the bending angle of the first and second bending parts 22 is controlled by the external adjustment mechanism so that the cutting surface of the rotary cutter 23 fits the plaque on the blood vessel wall, ensuring stability and precision during cutting.

[0029] Furthermore, this embodiment also provides some implementation details. The rotary cutting blade 23 includes: an outer rotary cutting blade, which is fixedly installed on the second bent portion 22, and the edge of the outer rotary cutting blade is provided with a first cutting tooth; and an inner rotary cutting blade, which is provided with a locking groove on the outer rotary cutting blade and is locked and installed inside the outer rotary cutting blade, and the edge of the inner rotary cutting blade is provided with a second cutting tooth.

[0030] In this embodiment, the diameter of the catheter 20 is designed according to the blood vessel. The tip has a semi-open, micro-pointed, conical metal rotary cutter 23 with serrated edges to improve the cutting force on the plaque. The metal cutter tip has a circular hole in the middle to facilitate the passage of the guidewire 31. The interface between the tip and the catheter 20 has a certain curvature. Two bending points are provided at the rear end of the catheter 20. The first bending point causes the catheter 20 to bend, ensuring the rotary cutter 23 is parallel and tightly against the blood vessel wall. The second bending point, positioned against the blood vessel wall, provides forward and downward support to the first bending point. The curved portion of the catheter 20 is a 3D spiral bend; rotating clockwise allows the cut plaque to be gradually transported along the spiral catheter 20 to the second bending point. At the rear end, plaque is prevented from falling back into the rotary cutter 23. Simultaneously, the catheter 20 advances in a spiral direction within the blood vessel. The 3D spiral catheter 20 design reduces the resistance of the catheter 20 through the sheath 10 and enhances the catheter 20's ability to pass through tortuous blood vessels. The bend at the connection point between the rotary cutter 23 and the catheter 20 is made of a flexible, bend-resistant material, molded with an internal metal braided layer (such as chromium or nickel) using mesh or spiral braiding. It can maintain a relatively straight position within the sheath 10, facilitating passage within the sheath 10. Within the blood vessel, which is more flexible than the sheath 10, the rotary cutter 20 is freed from the constraints of the sheath 10, replicating the bending arc of the catheter 20 and enabling the rotary cutter 23 to cut the blood vessel along the vessel wall. The inner rotary cutter has a semi-circular opening with serrated edges. The connection with the pipe uses a hyaluronic acid tube design with a certain degree of bending, which facilitates entry into the outer rotary cutter and conforms to the bending of the outer rotary cutter, enhancing the support of the tube 20 bending. When not in use, the inner rotary cutter overlaps inside the blade at the end of the outer rotary cutter head.

[0031] Furthermore, this embodiment also provides some implementation details. The first bending part 21 and the second bending part 22 are both provided with a sodium hydroxide tube structure, and are correspondingly provided with a first adjusting wire 33 and a second adjusting wire 34. The first adjusting wire 33 corresponds to the first bending part 21, and the second adjusting wire 34 corresponds to the second bending part 22, so as to adjust the bending angle of the first bending part 21 and the second bending part 22 respectively.

[0032] Furthermore, this embodiment also provides some implementation details, including: a winding unit 32 connected to the first adjusting thread 33 and the second adjusting thread 34; and a suction unit connected to the guide tube 20.

[0033] Furthermore, this embodiment also provides some implementation details. The first adjusting thread 33 has at least two relative directional controls. The specific bending angle of the first bending portion 21 is controlled by tightening and loosening the two directions respectively through the winding unit 32, and the angle is maintained by a locking structure. The corresponding second adjusting thread has the same arrangement. The suction unit is set on the catheter, specifically connected to the catheter of the external part, and the suction unit function is realized by an external suction device.

[0034] During use, a puncture needle is used to puncture the vein in the forearm, and guide wire 31 is inserted along the puncture needle; after inserting guide wire 31, the puncture needle is withdrawn; the combination of vascular sheath and dilator is inserted into the blood vessel along guide wire 31; guide wire 31 and dilator are withdrawn; microguide wire 31 is repositioned, and the combination of rotary cutting outer blade and rotary cutting inner blade is inserted into the blood vessel along microguide wire 31; when the desired cutting position is reached, the blade position is slightly adjusted so that it is close to the plaque; the inner blade rotates for the plaque at the directional position, cutting the plaque away from the blood vessel wall; with the help of catheter 20, aspiration and rotation of the outer blade are performed to gradually remove the cut plaque away from the opening of rotary cutting blade 23.

[0035] Furthermore, this embodiment also provides some implementation details.

[0036] Example 2:

[0037] This utility model also provides an embodiment that differs from the suction unit used in Embodiment 1. This embodiment further includes: a guide wire 31, with a guide hole provided at the head of the rotary cutting outer blade, and the guide wire 31 passing through the guide hole; and a soft plug 35, which is disposed in the conduit 20 and moves along the guide wire 31 within the conduit 20.

[0038] A soft plug 35 is placed inside the catheter 20. After the rotary cutting is completed, the bending structure is removed, and then the guide wire 31 is wound up to guide the soft plug 35 to slide along the guide wire 31, and the rotary-cut plaque is sent out along the catheter 20.

[0039] In summary, by improving the existing catheter 20 and adding external and internal rotating blades, arteriovenous fistula thrombi can be cut by rotation. Using internal rotation cutting with the blade facing inward will reduce damage to the blood vessel and protect the patient's blood vessels to a great extent. The passive mechanical thrombectomy combined with aspiration is convenient and can be repeated multiple times. The rotating blade 23 cuts and collects the thrombus simultaneously, which helps to reduce the probability of distal embolism and pulmonary embolism caused by plaque detachment.

[0040] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An adjustable rotary cutting device, characterized by, include: The sheath (10) has a release port (11); A conduit (20) is slidably disposed within the sheath (10). The conduit (20) is provided with an adjustable first bend (21) and a second bend (22). The conduit (20) extends the first bend (21) and the second bend (22) out of the sheath (10) from the release port (11). A rotary cutter (23) is disposed on the second bend (22). The first bend (21) and the second bend (22) are adjusted to make the rotary cutter (23) fit tightly against the patch to be cut. The conduit (20) is rotated and the rotary cutter (23) rotates along the central axis of the sheath (10).

2. An adjustable rotary cutting device according to claim 1, wherein, The rotary cutter (23) includes: A rotary cutting outer blade is fixedly installed on the second bent part (22), and the edge of the rotary cutting outer blade is provided with a first cutting tooth; The inner rotary cutter has a locking groove on the outer rotary cutter, and the inner rotary cutter is locked and installed inside the outer rotary cutter. The edge of the inner rotary cutter has a second cutting tooth.

3. An adjustable rotary cutting device according to claim 1, wherein, Also includes: The guide wire (31) has a guide hole at the head of the rotary cutting blade, and the guide wire (31) passes through the guide hole.

4. An adjustable rotary cutting device according to claim 3, wherein, Also includes: A soft plug (35) is disposed within the catheter (20), and the soft plug (35) moves along the guide wire (31) within the catheter (20).

5. An adjustable rotary cutting device according to claim 4, wherein, Its characteristic is that it further includes: The winding unit (32) is connected to the first adjusting wire (33) and the second adjusting wire (34); The suction unit is connected to the conduit (20).

6. An adjustable peeling device according to claim 4 or 5, characterized in that Both the first bending portion (21) and the second bending portion (22) are provided with a sodium hypochlorite tube structure, and are provided with a first adjusting wire (33) and a second adjusting wire (34). The first adjusting wire (33) corresponds to the first bending portion (21), and the second adjusting wire (34) corresponds to the second bending portion (22), so as to adjust the bending angle of the first bending portion (21) and the second bending portion (22) respectively.

7. An adjustable peeling device according to claim 6, characterized in that The first adjusting wire (33) has at least two relative directions of control. The specific bending angle of the first bending part (21) is controlled by the winding unit (32) tightening and loosening the two directions respectively, and the angle is maintained by the locking structure. The corresponding second adjusting wire has the same layout.

8. An adjustable peeling device according to claim 7, characterized in that The catheter has a multi-layered composite structure, with a smooth inner layer and hydrophilic coatings on both the inner and outer layers. Anti-slip textures are provided on the outer layer of the catheter outside the blood vessel.

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