A rotary cutting needle head and a rotary cutting needle for myocardial biopsy and diseased tissues

Abstract

The present invention discloses a rotary cutting needle head for myocardial biopsy and diseased tissue resection, including a rotary cutting needle head for myocardial biopsy and diseased tissue resection, including a needle tip and an outer tube connected to each other, a cutting through hole is provided on the side wall of the outer tube, and a first rotary cutting component is provided inside the outer tube, and a second rotary cutting component coaxial with the first rotary cutting component is also provided inside the outer tube, and the first rotary cutting component and the second rotary cutting component can move toward or away from each other along the axial direction. The second rotary cutting component includes a first support shaft coaxially arranged opposite to the first transmission shaft and a first inner sleeve sleeved outside the first support shaft; a plurality of first cutting edges are evenly spaced at the tail end of the first inner sleeve along the circumferential direction, and the first cutting edge and the second cutting edge can be engaged and connected; a transmission mechanism that can drive the second inner sleeve to move axially is also provided inside the outer tube. The present invention also discloses a rotary cutting needle, including the above-mentioned rotary cutting needle head, which can suck hypertrophic myocardium or tumor tissue out of the body along with the rotary cutting needle.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, relates to medical devices, and particularly relates to a rotary cutting needle head and a rotary cutting needle for myocardial biopsy and diseased tissues. Background Art

[0002] Radiofrequency ablation of the ventricular septum in hypertrophic cardiomyopathy through the apex under ultrasound guidance and radiofrequency ablation of cardiac tumors through the chest under ultrasound guidance have been clinically applied as new technologies. The principle of radiofrequency ablation is to dehydrate hypertrophic myocardium or tumor tissues, cause coagulative necrosis, and the necrotic tissues are reabsorbed, so as to achieve the treatment purpose. However, the existing radiofrequency ablation methods have defects such as incomplete ablation and large-area fibrous scars in myocardial tissues.

[0003] At present, various types of rotary cutting needles have been widely used in clinical treatment. For example, rotary cutting systems such as EnCor and Zhenxuan, and the needle head structure of the rotary cutting needle and the rotary cutting needle disclosed in the authorized patent CN201621098054.7. The rotary cutting needles in the prior art can "extend" the rotary cutting needle to the lesion through a micro-incision and a small-caliber "subcutaneous tunnel". Under the guidance of high-frequency color ultrasound, the lesion site is determined, the blade at the top of the rotating needle is attached to the lesion, and the cutting is carried out layer by layer. Through negative pressure suction, the lesion tissue is sucked out of the body along with the rotary cutting needle. The sampling window of the rotary cutting needle is adjustable, which can meet the rotary cutting requirements of different-sized lesions, retain the surrounding normal tissues to the greatest extent, be sharper and more stable during puncture, have smoother rotary cutting, and fuller sampling; there is no need to pause during the operation to collect samples; the operating handle realizes single-motor drive, the handle structure is simplified, the reliability of the device is improved, and the failure risk is reduced; at the same time, the weight of the handle is greatly reduced, and the operation is more convenient and comfortable; the rotary cutting needle has an intelligent recognition and automatic setting function, and the host computer can automatically recognize different models of rotary cutting needles and automatically match parameters, improving the operation efficiency and avoiding setting errors. Therefore, the rotary cutting needle has reached a certain degree of satisfaction especially in breast lesion surgeries. However, the existing cutting method of the rotary cutting needle is mainly one-way cutting. Among them, for the tubular rotary cutting needle core with one-way rotary cutting, there is a chamfer on the inner side, forming a flat cutting edge. Its defect is that when the diseased tissue to be sampled and cut is relatively hard, the flat cutting edge cuts slowly and the cutting edge is easily dulled, affecting the continuous cutting effect; for the tubular rotary cutting needle core with direct one-way punching, and its defect is that if the punching does not reach the bottom, the tissue is not easily cut off completely, and the needle tube of the existing rotary cutting needle is relatively short. In summary, the existing rotary cutting needles are not suitable for myocardial biopsy or resection of diseased tissues.

[0004] Therefore, it is urgent to develop a rotary cutting needle head and a rotary cutting needle for myocardial biopsy and diseased tissues of the heart on the basis of the above existing rotary cutting systems, and achieve sufficient cutting of the heart diseased tissues through a two-way cutting method. Summary of the Invention

[0005] In order to overcome the defects or shortcomings existing in the above-mentioned prior art, the purpose of the present invention is to provide a rotary cutting needle head and a rotary cutting needle for myocardial biopsy and diseased tissue. The rotary cutting needle "extends" to the hypertrophic myocardium or tumor through a micro-incision at the apex of the heart under the guidance of cardiac ultrasound, and can achieve layer-by-layer cutting of the lesion by using a double-edged opposite cutting method, and through negative pressure suction, the hypertrophic myocardium or tumor tissue is sucked out of the body along with the rotary cutting needle to achieve the purpose of biopsy or tissue resection.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A rotary cutting needle for myocardial biopsy and diseased tissue resection, comprising a needle tip and an outer tube connected to each other, a cutting through hole being opened on the side wall of the outer tube, and a first rotary cutting component being arranged inside the outer tube, and a second rotary cutting component being coaxial with the first rotary cutting component being also arranged inside the outer tube, and the first rotary cutting component and the second rotary cutting component being able to move toward or away from each other along the axial direction.

[0008] The present invention also has the following technical features:

[0009] Specifically, the first rotary cutting assembly includes a first transmission shaft with a hollow structure and a second inner sleeve connected to the first transmission shaft, and a plurality of second cutting edges are evenly spaced along the circumferential direction at the head end of the second inner sleeve.

[0010] The second peeling assembly comprises a first support shaft coaxially arranged opposite to the first transmission shaft and a first inner sleeve sleeved outside the first support shaft; a plurality of first cutting edges are evenly spaced along the circumferential direction at the tail end of the first inner sleeve, and the first cutting edges can be engaged with the second cutting edges;

[0011] A plurality of first air holes are circumferentially formed on the side walls of the first inner sleeve and the second inner sleeve;

[0012] The outer tube is also provided with a transmission mechanism which can drive the second inner sleeve to move axially.

[0013] Specifically, the transmission mechanism includes a transmission rod arranged along the axial direction of the outer tube and a power mechanism arranged along the radial direction of the outer tube. The transmission rod can move along the radial direction of the outer tube to be close to or away from the first inner sleeve driven by the power mechanism, and rotate under the drive of the first transmission shaft.

[0014] Furthermore, the power mechanism includes a support tube connected to the inner wall of the outer tube, a second air hole is opened on the side wall of the support tube, an air pipe is connected to the second air hole, a spring is arranged in the support tube, the top of the spring is connected to a piston unit, and the piston unit can move radially along the outer tube in the support tube.

[0015] Further, the power mechanism can be replaced by an airbag assembly. The airbag assembly includes an airbag disposed between the inner wall of the outer tube and the transmission rod, and an air pump connected to the airbag through a ventilation pipe. An inflation and extraction switching valve is provided on the ventilation pipe.

[0016] Further, an external first thread is provided on the outer wall of one end of the first inner sleeve near the first support shaft, and an external second thread is provided on the outer wall of one end of the transmission rod near the first support shaft. The first external thread matches the second external thread.

[0017] Further, a first gear is sleeved on the transmission rod, and a second gear that can be meshed with the first gear is sleeved on the first transmission shaft.

[0018] Further, the first air hole is a circular or rectangular through hole, and the first air holes are arranged in an array.

[0019] The present invention also discloses a rotary cutting needle, which includes the above-mentioned rotary cutting needle tip, a driving motor for driving the second inner sleeve to rotate, and a negative pressure system for sucking the sampled and cut sample into a sample box.

[0020] Further, the driving motor includes a hollow rotating shaft, the hollow rotating shaft is coaxially and communicatively connected to the first transmission shaft, and the hollow rotating shaft is also communicated with the sample box.

[0021] Further, the negative pressure system includes a suction pipe and a suction pump connected to each other, and the suction pipe is communicated with the second inner sleeve.

[0022] The present invention has the following beneficial effects compared with the prior art:

[0023] Compared with the rotary cutting needle in the prior art that can only perform unidirectional rotary cutting, the rotary cutting needle tip of the present invention realizes double-edge sampled cutting on opposite sides of the tissue structure by setting the first rotary cutting assembly and the second rotary cutting assembly that are axially symmetrically arranged, and by setting a transmission mechanism. Even when encountering harder tissues, the rotary cutting needle of the present invention can be well cut by setting serrated edges, and under the action of the negative pressure device, the cut tissue can be well adsorbed and transported. The cutting is fast and neat, solving the problems of slow sampled cutting and incomplete cutting of the rotary cutting needle in the existing rotary cutting system, reducing tissue adhesion during the sampled cutting process, and reducing the surgical risk introduced by too long surgical time caused by an inappropriate rotary cutting needle, realizing safer, more accurate and more convenient rotary cutting. Description of the Drawings

[0024] Figure 1 is the overall structural sectional view of the rotary cutting needle of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the airbag assembly of the present invention;

[0026] Figure 3 It is a schematic diagram of the cutting state of the present invention;

[0027] Figure 4 It is a sample obtained by using the single-edge cutting mode in the prior art;

[0028] Figure 5 It is a sample obtained by using the double-edge cutting mode of the present invention;

[0029] Each label in the figure represents:

[0030] 1 - outer tube, 2 - first rotary cutting assembly, 3 - second rotary cutting assembly, 4 - transmission mechanism, 5 - first air hole, 6 - first gear, 7 - second gear, 8 - negative pressure system, 9 - drive motor, 10 - sample box; 11 - cutting through hole; 21 - first transmission shaft, 22 - first inner sleeve; 31 - first support shaft, 32 - second inner sleeve; 41 - transmission rod, 42 - power mechanism, 43 - airbag assembly; 81 - suction pipe, 82 - suction pump; 91 - hollow rotating shaft; 421 - support tube, 422 - spring, 423 - piston unit, 424 - air pipe; 221 - first cutting edge; 321 - second cutting edge; 4211 - second air hole.

[0031] The following specifically describes the present invention in conjunction with the specification drawings and specific embodiments. Specific Embodiments

[0032] The following gives specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present invention.

[0033] It should be noted that in the present invention, unless otherwise specified, all components can be obtained commercially.

[0034] The terms "upper", "lower", "front", "rear", "top", "bottom", etc. used in the present invention to indicate the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "Inner", "outer", "inside", "outside" refer to the inside and outside of the corresponding component contour, and "front", "back" refer to the front and back of the corresponding component contour. The above terms should not be construed as limiting the present invention.

[0035] In the present invention, unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] It should be noted that the present invention is also applicable to tissue cutting of other organs, such as breast, thyroid, liver, uterus, etc.

[0037] Example 1

[0038] Following the above technical solution, Figures 1 to 2 As shown, this embodiment provides a rotary cutting needle for myocardial biopsy and diseased tissue resection, including a needle tip and an outer tube 1 connected to each other, a cutting through hole 11 is opened on the side wall of the outer tube 1, and a first rotary cutting component 2 is arranged in the outer tube 1, and a second rotary cutting component 3 coaxial with the first rotary cutting component 2 is also arranged in the outer tube 1, and the first rotary cutting component 2 and the second rotary cutting component 3 can move toward or away from each other along the axial direction.

[0039] In this embodiment, the length of the outer tube 2 of the rotary cutting needle can be selected according to the actual position of the organ to be removed, so as to adapt it to actual needs and solve the problem that the needle tube of the existing rotary cutting needle is short and not suitable for the heart or other visceral tissues. In other schemes, the outer tube can be set to be adjustable in length, for example, by setting a slide groove to achieve length adjustment, or adopting other length adjustment structures, as long as the length adjustment of the outer tube 2 can be achieved.

[0040] As a preferred solution of this embodiment, the first peeling assembly 2 includes a first transmission shaft 21 with a hollow structure and a first inner sleeve 22 connected to the first transmission shaft 21, and a plurality of first cutting edges 221 are evenly spaced along the circumferential direction at the head end of the first inner sleeve 22;

[0041] The second peeling assembly 3 includes a first support shaft 31 coaxially arranged opposite to the first transmission shaft 21 and a second inner sleeve 32 sleeved outside the first support shaft 31; a plurality of second cutting edges 321 are evenly spaced along the circumferential direction at the rear end of the second inner sleeve 32, and the second cutting edges 321 can be engaged with the first cutting edges 221;

[0042] Multiple first air holes 5 are circumferentially formed on the side walls of the first inner sleeve 22 and the second inner sleeve 32;

[0043] A transmission mechanism 4 is also provided inside the outer tube 1 and can drive the second inner sleeve 32 to move axially.

[0044] The first inner sleeve 22 can move axially along the outer tube under the drive of the first transmission shaft 21, and the second inner sleeve 32 can also move axially along the outer tube 1 under the drive of the transmission mechanism 4. When the first inner sleeve 22 and the second inner sleeve 32 move simultaneously, their moving directions are opposite. That is, during double-edge cutting, the first inner sleeve 22 and the second inner sleeve 32 move towards each other, and when separation is required, the first inner sleeve 22 and the second inner sleeve 32 move away from each other.

[0045] In this embodiment, the first inner sleeve 22 and the second inner sleeve 32 are coaxially arranged and have the same inner diameter and outer diameter to ensure that the first cutting edge 221 and the second cutting edge 321 can move towards each other axially and finally achieve an engaging connection. Both the first cutting edge 221 and the second cutting edge 321 adopt serrated edges.

[0046] As a preferred solution in this embodiment, the transmission mechanism 4 includes a transmission rod 41 arranged axially along the outer tube 1 and a power mechanism 42 arranged radially along the outer tube 1. The transmission rod 41 can move radially along the outer tube 1 under the drive of the power mechanism 42 to press against or leave the first inner sleeve 22, and the transmission rod 41 can rotate under the drive of the first transmission shaft 21.

[0047] As a preferred solution in this embodiment, the power mechanism 42 includes a support tube 421 connected to the inner wall of the outer tube 1. A second air hole 4211 is formed on the side wall of the support tube 421, and an air tube 424 is connected to the second air hole 4211. A spring 422 is arranged in the support tube 421, and the top end of the spring 422 is connected to a piston unit 423. The piston unit 423 can move radially along the outer tube 1 in the support tube 421. The working principle of the power mechanism 42 is similar to that of a cylinder.

[0048] As a preferred solution in this embodiment, the power mechanism 42 can be replaced by an airbag assembly 43. The airbag assembly 43 includes an airbag 421 arranged between the inner wall of the outer tube and the transmission rod 41, and an air pump 433 connected to the airbag 421 through a ventilation pipe 432. An inflation and deflation switching valve 434 is arranged on the ventilation pipe 432.

[0049] As a preferred solution in this embodiment, an external first thread is provided on the outer wall of the end of the first inner sleeve 22 close to the first support shaft 31, and an external second thread is provided on the outer wall of the end of the transmission rod 41 close to the first support shaft 31. The first external thread matches the second external thread. When the transmission rod 41 rotates, the first inner sleeve 22 can be driven through the cooperation between the threads.

[0050] As a preferred solution in this embodiment, a first gear 6 is sleeved on the transmission rod 41, and a second gear 7 that can be meshed with the first gear 6 is sleeved on the first transmission shaft 21. After the first gear 6 and the second gear 7 are meshed and connected, when the first transmission shaft 21 rotates, the transmission rod 41 can be driven to move.

[0051] As a preferred solution in this embodiment, the first air hole 5 is a circular or rectangular through hole, and the first air holes 5 are arranged in an array.

[0052] In this embodiment, the wall thickness of the outer tube 1 is equal to the wall thicknesses of the first inner sleeve 22 and the second inner sleeve 32. The wall thickness of the outer tube 1 ranges from 0.1 mm to 0.3 mm, and the inner diameter of the outer tube 1 ranges from 3 mm to 4 mm.

[0053] The working principle of this embodiment is as follows:

[0054] After cutting the skin at a predetermined puncture point, select an appropriate puncture angle and insert the needle tip of the rotary needle. Under the guidance of cardiac ultrasound, when the needle tip of the rotary needle reaches near the ventricular septum of the heart or the tissue to be cut through the skin and the cardiac apex, as Figure 3 shown, position the cutting through hole 21 below the tissue to be cut so that the tissue to be cut enters the cutting through hole 21.

[0055] Without starting the transmission mechanism 4, the use process of the device is the same as that of the rotary cutting needle in the prior art. By rotating the hollow rotating shaft 91 of the driving motor 9, the second inner sleeve 32 is driven to rotate towards the needle tip 1 to cut the tissue to be cut; the cut tissue enters the inner cavity of the second inner sleeve 32;

[0056] When the transmission mechanism 4 is started simultaneously, the transmission rod 41 can move radially along the outer tube 1 driven by the power mechanism 42. Finally, the first gear 6 and the second gear 7 are meshed, and the end of the transmission rod 41 close to the needle tip 1 is in close contact with the first inner sleeve 22. The transmission rod 41 drives the first inner sleeve 22 to move axially along the outer tube 1 towards the second inner sleeve 32 under the drive of the first transmission shaft 21. At the same time, the second inner sleeve 32 moves along the outer tube 1 towards the first inner sleeve 22 under the action of the first transmission shaft 21. During this process, the first cutting edge 221 and the second cutting edge 321 perform double-edge cutting on the lesion part. Multiple rotary cuts can be performed as needed.

[0057] Embodiment 2

[0058] This embodiment provides a rotary cutting needle for myocardial biopsy and resection of diseased tissues, including the rotary cutting needle tip disclosed in Embodiment 1, a driving motor 9 for driving the second inner sleeve 32 to rotate, and a negative pressure system 8 for sucking the sampled and cut samples into the sample box 10.

[0059] As a preferred solution of this embodiment, the drive motor 9 includes a hollow rotating shaft 91. The hollow rotating shaft 91 is coaxially and through-connected to the first transmission shaft 21. The hollow rotating shaft 91 is also communicated with the sample box 10. The cut sample can enter the sample box 10 along the inner sleeve 3 by negative pressure suction.

[0060] As a preferred solution of this embodiment, the negative pressure system 8 includes a suction pipe 81 and a suction pump 82 which are connected. The suction pipe 81 is communicated with the second inner sleeve 32.

[0061] In other solutions, the negative pressure system 8 can be set according to requirements. For example, a solid rotating shaft can be selected. At this time, a sampling hole can be opened on the side wall of the second inner sleeve 32. The suction pipe 81 is connected to the sampling hole, and the suction pipe 81 is then connected to the suction pump 82.

[0062] The working process of this embodiment is as follows:

[0063] During the puncture process, under the guidance of cardiac ultrasound, when the rotary cutting needle reaches the vicinity of the ventricular septum of the heart or the tissue to be cut through the skin and the cardiac apex, the cutting through-hole 21 is positioned below the tissue to be cut. Then, according to the condition of the lesion, single-edge cutting or double-edge cutting is selected. When performing single-edge cutting, the drive motor 9 is turned on to drive the second inner sleeve 32 to rotate and cut towards the tip 1 of the needle, cutting the tissue to be cut; after the tissue to be cut is completely cut off, the drive motor 9 is turned off, and then the suction pump 82 and the suction pipe 81 are used to suck out the samples remaining in the first inner sleeve 22 and the second inner sleeve 32 at the lesion site to the outside of the body and into the sample box 10.

[0064] When double-edge cutting is required, the transmission mechanism 4 is started. The transmission rod 41 can move radially along the outer tube 1 driven by the power mechanism 42. Finally, the first gear 6 and the second gear 7 are engaged. One end of the transmission rod 41 close to the tip 1 of the needle is pressed against the first inner sleeve 22. The transmission rod 41 rotates driven by the first transmission shaft 21, thereby driving the first inner sleeve 22 to move axially along the outer tube 1. At the same time, the second inner sleeve 32 also moves axially along the outer tube 1 under the action of the first transmission shaft 21 to achieve double-edge cutting. Then, the suction pump 82 and the suction pipe 81 are used to suck out the samples remaining in the first inner sleeve 22 and the second inner sleeve 32 at the lesion site to the outside of the body and into the sample box 10.

[0065] Such as Figure 4 and Figure 5As shown, there are differences between the samples obtained by using the single-edge cutting mode in the prior art and the double-edge cutting mode of the present invention. The samples obtained by the single-edge cutting mode in the prior art are relatively fragmented, small in size, not formed, and require sample paper collection. The tissue is too soft or too hard, and there is a risk of not obtaining a sample. The samples obtained by the double-edge cutting mode of the present invention are relatively complete, large in size, and in the shape of filaments, and do not require sample paper collection. Regardless of the tissue condition, a sample can be obtained.

[0066] The above comparison shows that the rotary cutting needle of the present invention can also cut the diseased tissue well through the oppositely arranged double-edge serrated blade edges, and adsorb and transport the cut tissue under the action of the negative pressure device. The cutting is fast and neat, solving the problems of slow sampling cutting and incomplete cutting of the rotary cutting needle in the existing rotary cutting system, reducing tissue adhesion during the sampling cutting process, and reducing the surgical risks introduced by too long surgical time caused by inappropriate rotary cutting needles, realizing safer, more accurate and more convenient rotary cutting.

[0067] In the above embodiments, the purpose, technical solution and advantages of the present invention are further described in detail. It should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0068] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0069] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.

[0070] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content invented by the present disclosure.

Claims

1. A rotary cutting needle tip for myocardial biopsy and resection of diseased tissues, comprising a needle tip and an outer tube (1) connected and arranged, a cutting through hole (11) is formed in the side wall of the outer tube (1), and a first rotary cutting assembly (2) is arranged in the outer tube (1), characterized in that, A second peeling assembly (3) coaxial with the first peeling assembly (2) is also provided in the outer tube (1); the first peeling assembly (2) and the second peeling assembly (3) are capable of moving towards or away from each other in the axial direction.

2. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 1, characterized in that, The first peeling assembly (2) comprises a first transmission shaft (21) of a hollow structure and a first inner sleeve (22) connected to the first transmission shaft (21), wherein a plurality of first cutting edges (221) are evenly spaced along the circumferential direction at the head end of the first inner sleeve (22). The second peeling assembly (3) comprises a first support shaft (31) coaxially arranged opposite to the first transmission shaft (21) and a second inner sleeve (32) sleeved outside the first support shaft (31); a plurality of second cutting edges (321) are evenly spaced along the circumferential direction at the rear end of the second inner sleeve (32), and the second cutting edge (321) is engageably connected with the first cutting edge (221); A plurality of first air holes (5) are provided on the side walls of the first inner sleeve (22) and the second inner sleeve (32) along the circumferential direction; A transmission mechanism (4) capable of driving the second inner sleeve (32) to move axially is also provided in the outer tube (1).

3. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 2, wherein The transmission mechanism (4) comprises a transmission rod (41) arranged axially along the outer tube (1) and a power mechanism (42) arranged radially along the outer tube (1); the transmission rod (41) can move radially along the outer tube (1) to be close to or away from the first inner sleeve (22) under the drive of the power mechanism (42); and the transmission rod (41) can rotate under the drive of the first transmission shaft (21).

4. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 3, wherein, The power mechanism (42) comprises a support tube (421) connected to the inner wall of the outer tube (1); a second air hole (4211) is provided on the side wall of the support tube (421); an air pipe (424) is connected to the second air hole (4211); a spring (422) is provided in the support tube (421); a top end of the spring (422) is connected to a piston unit (423); and the piston unit (423) can move radially along the outer tube (1) in the support tube (421).

5. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 3, wherein The power mechanism (42) may be replaced by an airbag assembly (43), wherein the airbag assembly (43) comprises an airbag (421) arranged between the inner wall of the outer tube and the transmission rod (41), and an air pump (433) connected to the airbag (421) via a ventilation pipe (432), wherein the ventilation pipe (432) is provided with an inflation / extraction switching valve (434).

6. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 3, characterized in that, A first external thread is provided on the outer wall of one end of the first inner sleeve (22) close to the first support shaft (31), and a second external thread is provided on the outer wall of one end of the transmission rod (41) close to the first support shaft (31), and the first external thread matches the second external thread.

7. The rotary cutting needle tip for myocardial biopsy and diseased tissue resection according to claim 3, wherein The transmission rod (41) is sleeved with a first gear (6), and the first transmission shaft (21) is sleeved with a second gear (7) that can mesh with the first gear (6).

8. A rotatory cutting needle for myocardial biopsy and resection of diseased tissues, characterized in that, The rotary cutting needle includes a rotary cutting needle tip as described in any one of claims 2 to 7, and further includes a drive motor (9) for driving the rotation of the second inner sleeve (32), and a negative pressure system (8) for sucking the sampled and cut sample into the sample box (10).

9. The rotational cutting needle for myocardial biopsy and resection of diseased tissues according to claim 8, characterized in that, The drive motor (9) includes a hollow rotating shaft (91), the hollow rotating shaft (91) is coaxially and through-connected with the first transmission shaft (21), and the hollow rotating shaft (91) is also communicated with the sample box (10).

10. The rotational cutting needle for myocardial biopsy and diseased tissue resection according to claim 8, characterized in that, The negative pressure system (8) includes a suction pipe (81) and a suction pump (82) which are connected and arranged, and the suction pipe (81) is communicated with the second inner sleeve (32).

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