Thrombus cutting assembly and thrombus cutting device

Abstract

The present invention relates to the field of medical devices, and in particular to a thrombus cutting assembly and a thrombus cutting device; wherein the thrombus cutting assembly includes a shielding portion, a knife rod, and a cutting tool, wherein the shielding portion includes an integrally formed bullet-shaped shell and a crisscross bowl-shaped baffle, the knife rod is connected to the end of a transmission tube, and the front end of the knife rod is rotatably connected to the crisscross bowl-shaped baffle. The present invention, by providing the bullet-shaped shell and the crisscross bowl-shaped baffle, on the one hand, plays a role in blocking the blood vessel wall, that is, during the thrombus removal process, the blood vessel wall and venous valve can be isolated outside the crisscross bowl-shaped baffle, so as to reduce the blood vessel wall and venous valve from entering the interior of the thrombus suction tube during the cutting process, and on the other hand, the crisscross bowl-shaped baffle and the bullet-shaped shell facilitate the introduction into the blood vessel to reach the designated position for thrombus removal, effectively reducing the entry resistance during the entry process, and facilitating operation.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a thrombus cutting assembly and a thrombus cutting device. Background Art

[0002] Deep venous thrombosis (DVT) in the lower extremities is caused by abnormal blood coagulation within the deep veins of the lower extremities. DVT increases venous pressure, obstructing blood flow and resulting in lower extremity swelling, pain, and dysfunction. There is also a risk of thrombus dislodgment, which, along with the impact of blood flow, can reach the pulmonary artery and cause pulmonary embolism (PE). If DVT is not effectively treated in the acute phase, the thrombus may become organized, leading to venous obstruction, valvular dysfunction, venous reflux, and venous hypertension, resulting in post-thrombotic syndrome (PTS), which can endanger limb survival and threaten life.

[0003] At present, mechanical thrombus removal devices are often used to treat thrombosis. They are a group of instruments used to remove acute and acute thrombosis in blood vessels. They use dissolution, crushing, and suction to remove thrombi in blood vessels and restore blood circulation and valve function. PMT is a minimally invasive intracavitary thrombus removal device that can quickly remove thrombi and restore blood flow. Some existing PMTs use a driver to drive the delivery screw to rotate. The continuously rotating screw generates negative pressure, which sucks the thrombus near the working head of the catheter into the inside of the catheter, and is cut into pieces by the high-speed rotating delivery screw and discharged out of the body through a hose. However, due to the high-speed rotation of the catheter delivery screw, during the process of aspirating thrombi, the blood vessel wall will be sucked into the working head and entangled with the delivery screw, thereby posing a risk of damaging the blood vessel wall and causing vascular damage.

[0004] To this end, the present invention provides a thrombus cutting assembly and a thrombus cutting device. Summary of the Invention

[0005] Based on this, it is necessary to provide a thrombus cutting assembly and a thrombus cutting device to address the above technical problems.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A thrombus cutting assembly includes a shielding portion, a knife rod arranged inside the shielding portion, and a cutting tool fixedly mounted on the knife rod. The shielding portion includes an integrally formed bullet-shaped shell and a mitre-shaped bowl-shaped baffle fixedly mounted on the front end of the shell. The knife rod is connected to the end of a transmission tube and is used to drive the knife rod and the cutting tool to perform rotational cutting when the transmission tube rotates. The front end of the knife rod is rotatably connected to the mitre-shaped bowl-shaped baffle.

[0008] Specifically, the cutting tool includes a first cutting part and a second cutting part. The first cutting part is provided with a plurality of first cutting blades, and the plurality of first cutting blades are arranged spirally around the central axis of the tool rod. The second cutting part is provided with a plurality of second cutting blades, and the second cutting blades are staggered between two adjacent first cutting blades, and the second cutting blades are arranged close to the transmission tube.

[0009] Specifically, the second cutting blade includes an integrally formed first blade end face, a second hook-shaped blade portion and a third blade end face. The first blade end face and the third blade end face are symmetrically arranged, and the hook structure of the second hook-shaped blade portion is arranged toward the direction of the M-shaped baffle.

[0010] Specifically, the outer diameter of the second hook-shaped blade portion is greater than the maximum outer diameter of the first cutting blade.

[0011] Specifically, the helix angle of the first cutting edge is γ, which satisfies: 10°≤γ≤15°.

[0012] Based on the same inventive concept, the present invention also provides a thrombus cutting device, including a thrombus cutting assembly, a driving device and a thrombus suction tube, the shell is fixedly connected to the front end of the thrombus suction tube, the transmission tube is fixed to the front end of the driving device and is accommodated inside the thrombus suction tube, and is used to drive the transmission tube to rotate and drive the cutting tool to rotate and cut by driving the tool rod.

[0013] Specifically, it also includes a suction device, which includes a support ring, a suction main pipe, multiple suction sub-pipes and multiple suction nozzles. The support ring is fixedly installed on the inner wall of the embolism suction pipe, and the suction main pipe includes a connected annular section and a connecting section. The support ring is provided with a limiting ring groove on the side facing the M-shaped bowl-shaped baffle, and the annular section is interference-installed in the limiting ring groove. The side of the limiting ring groove is provided with a through hole for penetrating the connecting section. The suction sub-pipe is uniform and fixedly installed on the inner wall of the shell. The suction sub-pipe is provided with multiple suction nozzles at equal intervals on the side of the suction sub-pipe facing the cutting tool, and the end of the connecting section is connected to the embolism suction device.

[0014] The advantages and beneficial effects of the present invention are as follows: a thrombus cutting assembly and a thrombus cutting device provided by the present invention, by providing a bullet-shaped shell and a M-shaped bowl-shaped baffle, on the one hand, play the role of blocking the blood vessel wall, that is, during the thrombus removal process, the blood vessel wall and the venous valve can be isolated on the outside of the M-shaped bowl-shaped baffle, so as to reduce the blood vessel wall and the venous valve from entering the thrombus suction tube during the cutting process; on the other hand, the M-shaped bowl-shaped baffle and the bullet-shaped shell are convenient for guiding into the blood vessel to reach the designated position to remove the thrombus, and during the entry process, the entry resistance is effectively reduced, which is convenient for operation; by providing a first cutting part and a second cutting part, the thrombus can be cut in multiple directions, and at the same time, the cutting coverage range can be increased, so as to improve the efficiency of thrombus fragmentation and reduce the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the thrombus cutting device in an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of the structure of the rice-shaped bowl-shaped baffle in an embodiment of the present invention;

[0017] Figure 3 Schematic diagram of the structure of the second cutting edge in an embodiment of the present invention.

[0018] Figure numerals: shell 1, M-shaped bowl-shaped baffle 2, knife rod 3, transmission tube 4, support ring 5, annular section 6, suction auxiliary tube 7, suction nozzle 8, first cutting part 9, first blade end face 10, second hook-shaped blade part 11, third blade end face 12, through hole 13, connecting section 14, thrombus suction device 15, drive device 16, thrombus suction tube 17. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Example 1

[0021] Reference Attachment Figure 1-3In order to solve the above technical problems, the present embodiment provides a thrombus cutting assembly, whose structure includes a shielding part, a knife rod 3 arranged inside the shielding part, and a cutting tool fixedly installed on the knife rod 3. The shielding part is composed of a bullet-shaped shell 1 and a M-shaped bowl-shaped baffle 2 fixedly installed on the front end of the shell 1 to form an integrally formed structure. By using the M-shaped bowl-shaped baffle 2 and the bullet-shaped shell 1, on the one hand, the blood vessel wall and the venous valve can be isolated on the outside of the M-shaped bowl-shaped baffle 2, so as to reduce the blood vessel wall and the venous valve from entering the thrombus suction tube 17 during the cutting process. On the other hand, the M-shaped bowl-shaped baffle 2 facilitates the removal of the thrombus at the designated position of the blood vessel when the device is introduced into the blood vessel. During the entry process, the entry resistance is effectively reduced, the operation is convenient, and the patient's pain level is reduced.

[0022] In this embodiment, the knife rod 3 is connected to the end of the transmission tube 4, and is used to drive the knife rod 3 and the cutting tool to perform rotational cutting when the transmission tube 4 rotates. The front end of the knife rod 3 is rotationally connected to the M-shaped bowl-shaped baffle 2; wherein, the cutting tool is fixedly installed by the knife rod 3, and at the same time, the two end heads of the knife rod 3 are respectively connected to the transmission tube 4 and the M-shaped bowl-shaped baffle 2. On the one hand, when the transmission tube 4 rotates, it can drive the knife rod 3 and the cutting tool thereon to rotate and cut together, so as to achieve the removal of the thrombus. On the other hand, the M-shaped bowl-shaped baffle 2 is rotationally connected to the knife rod 3, which is convenient for improving the stability of the overall structure of the knife rod 3, the cutting tool and the transmission tube 4 during rotational cutting, so as to improve the efficiency of thrombus crushing and reduce the operation time.

[0023] In this embodiment, the cutting tool includes a first cutting part 9 and a second cutting part. The first cutting part 9 is provided with a plurality of first cutting blades, and the plurality of first cutting blades are spirally extended around the central axis of the shank 3. The second cutting part is provided with a plurality of second cutting blades, and the second cutting blades are staggered between two adjacent first cutting blades, and the second cutting blades are arranged close to the transmission tube 4; the second cutting blade includes an integrally formed first blade end face 10, a second hook-shaped blade portion 11 and a third blade end face 12, and the first blade end face 10 and the third blade end face 12 are symmetrically arranged, and the hook-shaped structure of the second hook-shaped blade portion 11 is arranged toward the direction of the M-shaped baffle; the outer diameter of the second hook-shaped blade portion 11 is greater than the maximum outer diameter of the first cutting blade; the helix angle of the first cutting blade is γ, satisfying: 10°≤γ≤15°.

[0024] In this embodiment, by providing the first cutting portion 9, thrombus entering the interior of the bullet-shaped shell 1 can be removed. During the cutting process, large thrombi are converted into small and scattered thrombi. If the small thrombi are not sucked out in time, they are easy to enter the interior of the thrombus suction tube 17. The second cutting blade is used to prevent small thrombi from entering the interior of the thrombus suction tube 17 during the rotation process. In addition, the second cutting blade is composed of a first blade end face 10, a second hook-shaped blade portion 11 and a third blade end face 12. Among them, the second hook-shaped blade portion 11 can also gather and guide the thrombus to move toward the position of the first cutting portion 9, so as to further assist in improving the cutting effect of the first cutting portion 9; because the outer diameter of the second hook-shaped blade portion 11 is greater than the maximum outer diameter of the first cutting blade, the guiding role of the second cutting portion can be further enhanced, and the thrombus crushing effect can be effectively improved; when the helix angle γ of the first cutting blade is within this range, the cutting angle of the first cutting blade can be optimized to improve the cutting effect, so as to improve the thrombus crushing efficiency and reduce the operation time.

[0025] Example 2

[0026] Based on the same inventive concept, the present invention also provides a thrombus cutting device, Figure 1 , including a thrombus cutting assembly, a driving device 16 and a thrombus suction tube 17, the shell 1 is fixedly connected to the front end of the thrombus suction tube 17, the transmission tube 4 is fixed to the front end of the driving device 16 and is housed inside the thrombus suction tube 17, and is used to drive the transmission tube 4 to rotate and drive the cutting tool to rotate and cut by driving the knife rod 3.

[0027] In this embodiment, by providing a driving device 16, the transmission tube 4, the cutter rod 3 and the entire structure of the cutting tool can be driven to perform rotational cutting, thereby achieving the removal of the thrombus.

[0028] In this embodiment, a suction device is also included, which includes a support ring 5, a suction main pipe, multiple suction sub-pipes 7 and multiple suction nozzles 8. The support ring 5 is fixedly installed on the inner wall of the embolism suction pipe 17. The suction main pipe includes a connected annular section 6 and a connecting section 14. The support ring 5 is provided with a limiting ring groove on the side facing the M-shaped bowl-shaped baffle 2. The annular section 6 is interference fit in the limiting ring groove. A through hole 13 for passing the connecting section 14 is provided on the side of the limiting ring groove. The suction sub-pipe 7 is evenly and fixedly installed on the inner wall of the shell 1. Multiple suction nozzles 8 are evenly spaced on the side of the suction sub-pipe 7 facing the cutting tool. The end of the connecting section 14 is connected to the embolism suction device 15.

[0029] In this embodiment, a support ring 5 is provided to fix the main suction pipe, and a plurality of auxiliary suction pipes 7 are evenly provided on the main suction pipe, and a plurality of suction nozzles 8 are evenly provided on the auxiliary suction pipes 7. During the thrombus removal process, multi-directional suction of the thrombus is facilitated, the thrombus is effectively captured and prevented from escaping, and the thrombus capture rate is high.

[0030] Obviously, those skilled in the art will appreciate that the various steps of the present invention described above can be performed in different ways than the present invention, and that simulation methods and experimental equipment include but are not limited to those described above. The various steps of the present invention described above can, in some cases, be performed in a different order than that shown here, and the steps shown or described above can be performed separately. Therefore, the present invention is not limited to any particular combination of hardware and software.

[0031] The above content is a further detailed description of the present invention in conjunction with specific embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A thrombus cutting assembly, characterized in that: The utility model comprises a shielding portion, a knife bar disposed inside the shielding portion, and a cutting tool fixedly mounted on the knife bar. The shielding portion comprises an integrally formed bullet-shaped shell and a 'P-shaped bowl-shaped baffle fixedly mounted on the front end of the shell. The knife bar is connected to the end of the transmission tube and is used to drive the knife bar and the cutting tool to perform rotary cutting when the transmission tube rotates. The front end of the knife bar is rotatably connected to the 'P-shaped bowl-shaped baffle. The cutting tool includes a first cutting part and a second cutting part, the first cutting part is provided with a plurality of first cutting edges, the second cutting part is provided with a plurality of second cutting edges, the second cutting edges are staggered between two adjacent first cutting edges, the second cutting edge includes an integrally formed first blade end face, a second hook-shaped blade portion and a third blade end face, the first blade end face and the third blade end face are symmetrically arranged, and the outer diameter of the second hook-shaped blade portion is larger than the maximum outer diameter of the first cutting edge.

2. The thrombus cutting assembly according to claim 1, characterized in that: The plurality of first cutting blades are arranged to extend spirally around the central axis of the cutter bar, and the second cutting blades are arranged close to the transmission tube.

3. The thrombus cutting assembly according to claim 2, characterized in that: The hook-shaped structure of the second hook-shaped blade portion is arranged toward the direction of the M-shaped baffle.

4. The thrombus cutting assembly according to claim 1, characterized in that: The helix angle of the first cutting edge is γ, which satisfies the following: 10°≤γ≤15°.

5. A thrombus cutting device, characterized in that: It comprises the thrombus cutting assembly as described in any one of claims 1 to 4, and also comprises a driving device and a thrombus suction tube, the shell is fixedly connected to the front end of the thrombus suction tube, the transmission tube is fixed to the front end of the driving device and is accommodated inside the thrombus suction tube, and is used to drive the transmission tube to rotate and drive the cutting tool to rotate and cut by driving the tool rod.

6. The thrombus cutting device according to claim 5, characterized in that: It also includes a suction device, which includes a support ring, a suction main pipe, multiple suction sub-pipes and multiple suction nozzles. The support ring is fixedly installed on the inner wall of the embolism suction pipe, and the suction main pipe includes a connected annular section and a connecting section. The support ring is provided with a limiting ring groove on the side facing the M-shaped bowl-shaped baffle, and the annular section is interference-installed in the limiting ring groove. The side of the limiting ring groove is provided with a through hole for penetrating the connecting section. The suction sub-pipe is uniform and fixedly installed on the inner wall of the shell. Multiple suction nozzles are evenly spaced on the side of the suction sub-pipe facing the cutting tool, and the end of the connecting section is connected to the embolism suction device.

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