Rotary cutting type myocardial biopsy forceps

Abstract

The rotary cutting type myocardial biopsy forceps comprise a sleeve assembly, a catheter and a handle assembly, the far end of the handle assembly is connected with the near end of the catheter, and the far end of the catheter is connected with the sleeve assembly; the sleeve assembly comprises a sleeve body, the near end of the sleeve body is connected with the catheter, the far end of the sleeve body is provided with an opening, a rotary cutter is slidably arranged in the sleeve body, a first driving part is arranged in the catheter, and the handle assembly is in driving connection with the rotary cutter through the first driving part and used for driving the rotary cutter to stretch out of the sleeve body. The cardiac muscle tissue is subjected to rotary cutting; a closing assembly is movably arranged at the far end of the sleeve body, a second driving part is arranged in the catheter, and the handle assembly is in driving connection with the closing assembly through the second driving part and used for controlling the closing assembly to selectively open or close an opening in the far end of the sleeve body. The rotary cutting type myocardial biopsy forceps can accurately control the sampling depth, and the opening in the far end of the sleeve body can be closed after sampling, so that myocardial cells are prevented from falling off.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a rotary-cutting myocardial biopsy forceps. Background Art

[0002] Endomyocardial biopsy utilizes a catheter-mounted vascular clamp to obtain endocardial tissue from the right or left ventricle through a vascular channel (e.g., a blood vessel). This technique is crucial for the accurate diagnosis of heart diseases such as myocarditis and cardiomyopathy. Currently, standardized histopathological and immunohistochemical diagnostic criteria combined with endomyocardial biopsy (EMB) are the gold standard for diagnosing myocarditis and related myocardial diseases.

[0003] Specifically, when using myocardial biopsy forceps to perform endomyocardial biopsy, a pathway from the body to the blood vessels is first constructed through vascular puncture, and then the myocardial biopsy forceps is sent from the body into the blood vessel cavity, and reaches the endocardial surface of the right ventricle or left ventricle through the course of the blood vessels. During this period, X-ray fluoroscopy is required to observe in real time the position of the distal end of the myocardial biopsy forceps (that is, the end away from the operator, that is, the clamping end of the myocardial biopsy forceps that clamps the endocardial myocardial tissue). When the myocardial biopsy forceps reaches the area to be biopsied in the right ventricle or left ventricle, the endocardial myocardial tissue can be clamped, and then the biopsy forceps can be removed from the blood vessel, thereby completing the entire biopsy operation.

[0004] Chinese patent document CN117179829A discloses a myocardial biopsy forceps, comprising a biopsy forceps body, the biopsy forceps body comprising a catheter, a clamp head, and a handle, the clamp head being disposed at a first end of the catheter, the handle being disposed at a second end of the catheter, and the clamp head being connected via a control line. The clamp head comprises a coupled first clamp arm and a second clamp arm, the first clamp arm and the second clamp arm being capable of opening and closing. When sampling, the clamp head is first opened, allowing the first clamp arm and the second clamp arm to open to a certain angle. When the first clamp arm and the second clamp arm are closed, the myocardial portion to be examined can be bitten off, and the biopsy forceps can then be withdrawn, and the portion to be examined can be transported outside the body for testing. A clearance space is provided at the tail of the first clamp arm and the second clamp arm, and a sensor is disposed in the clearance space.

[0005] The myocardial biopsy forceps have the following disadvantages and shortcomings: (1) The myocardial tissue torn off by the forceps head forms a wound that can easily cause thrombus embolism; (2) It is difficult to accurately control the cutting depth of traditional biopsy forceps, which may lead to technical defects such as shallow sampling, insufficient sample, or excessive sampling and damage to deep structures; (3) The head end of the biopsy forceps is designed as a metal clamp with a hard material. It enters the blood vessels and cardiac cavity in a closed state. If the jaws are accidentally opened before sampling, it is easy to cause iatrogenic damage, such as damage to important tissues such as blood vessels, valve leaflets or chordae tendineae. If the jaws are accidentally opened after sampling, the torn tissue is likely to fall off, leading to the risk of embolism.

[0006] Therefore, there is an urgent need to provide a rotary cutting myocardial biopsy forceps with small wound surface and no thromboembolism. Summary of the Invention

[0007] (1) Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a rotary myocardial biopsy forceps, which solves the technical problem that the myocardial tissue avulsed by the prior myocardial biopsy forceps forms a wound surface that easily causes thromboembolism.

[0009] (2) Technical solution

[0010] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0011] An embodiment of the present invention provides a rotary myocardial biopsy forceps, comprising a sleeve assembly, a catheter, a handle assembly, and a rotary cutter located inside the sleeve assembly, wherein the distal end of the handle assembly is connected to the proximal end of the catheter, and the distal end of the catheter is connected to the sleeve assembly;

[0012] The sleeve assembly includes a sleeve body and a closing assembly arranged at the distal open end of the sleeve body, the proximal end of the sleeve body is connected to the catheter; the rotary cutter is slidably arranged inside the sleeve body;

[0013] A first driving member is provided inside the catheter, and the handle assembly is connected to the rotary cutter through the first driving member to drive the rotary cutter to extend out of the sleeve body and rotary cut the myocardial tissue;

[0014] A second driving component is provided inside the catheter, and the handle assembly is drivenly connected to the sealing assembly via the second driving component to control the sealing assembly to selectively open or close the opening at the distal end of the sleeve body.

[0015] Optionally, the sleeve body includes an inner cylinder and an outer cylinder sleeved on the periphery of the inner cylinder;

[0016] The proximal end surface of the outer cylinder extends radially to connect to the proximal end surface of the inner cylinder, the distal end of the conduit is connected to the proximal end of the inner cylinder, the interior of the inner cylinder accommodates the rotary cutter, the outer wall surface of the inner cylinder and the inner wall surface of the outer cylinder form an annular space, a part of the closing component is accommodated in the annular space, and the other part of the closing component can selectively open or close the distal end of the inner cylinder.

[0017] Optionally, the closure assembly includes a first pipe segment and a second pipe segment;

[0018] The distal end of the first pipe segment is connected to the proximal end of the second pipe segment, and the second pipe segment is divided into at least two sector ring structures along the circumferential direction, and a sector-shaped closed clamp head is provided at the distal end of each sector ring structure;

[0019] The second tube segment is made of a shape memory alloy and has an initial shape and a variable shape. In the initial shape, the distal end of the second tube segment expands radially outward, thereby driving the closing clamp head to open the distal end of the inner cylinder;

[0020] The second driving member pulls the second pipe section into the interior of the sleeve body. The second pipe section is restricted by the outer cylinder and switches from the initial shape to a changed shape. In the changed shape, the distal end of the second pipe section contracts radially inward, driving all the closing clamp heads to combine to form a circular structure to seal the distal end of the inner cylinder.

[0021] Optionally, when the distal end of the second tube segment contracts radially inward, it can drive each sealing forceps head to squeeze the wound surface to seal the wound surface.

[0022] Optionally, the handle assembly includes a handle body and a closed sliding sleeve;

[0023] The handle body is connected to the proximal end of the catheter, and a closed sleeve is provided on the periphery of the handle body. The second driving member is a traction wire, one end of the traction wire is connected to the closed sleeve, and the other end of the traction wire is connected to the first tube section, which is used to drive the closing component to move toward the proximal side, switching from the initial form to the changed form.

[0024] Optionally, a compression spring is provided in the annular space inside the sleeve body, and the compression spring is used to drive the sealing component to move toward the distal side, switching from the changed form to the initial form.

[0025] Optionally, the handle assembly further comprises a knurled high head screw;

[0026] A threaded hole is provided on the closed sleeve, and a positioning hole is provided on the handle body. The knurled high head screw is screwed into the threaded hole on the closed sleeve, and the end of the knurled high head screw can be selectively plugged into the positioning hole on the handle body to axially position the closed sleeve.

[0027] Optionally, the handle assembly further comprises a push-pull ring;

[0028] The first driving member is a transmission wire, the push-pull ring is connected to one end of the transmission wire, and the other end of the transmission wire is connected to the rotary cutter.

[0029] Optionally, the rotary cutter is a circular or polygonal hollow tubular cutter.

[0030] Optionally, the outer surfaces of the sleeve body, the rotary cutter and the closure assembly are coated with an ultra-slip coating.

[0031] (3) Beneficial effects

[0032] The beneficial effects of the present invention are as follows: the rotary cutting myocardial biopsy forceps of the present invention include a sleeve assembly, a catheter, a handle assembly and a rotary cutter located inside the sleeve assembly, the distal end of the handle assembly is connected to the proximal end of the catheter, and the distal end of the catheter is connected to the sleeve assembly; the sleeve assembly includes a sleeve body and a closing assembly arranged at the open mouth at the distal end of the sleeve body, and the proximal end of the sleeve body is connected to the catheter; the rotary cutter is slidably arranged inside the sleeve body; a first driving member is provided inside the catheter, and the handle assembly forms a driving connection with the rotary cutter through the first driving member, so as to drive the rotary cutter to extend out of the sleeve body and rotary cut myocardial tissue; a second driving member is provided inside the catheter, and the handle assembly forms a driving connection with the closing assembly through the second driving member, so as to control the closing assembly to selectively open or close the open mouth at the distal end of the sleeve body. Compared with existing myocardial biopsy forceps, the rotary myocardial biopsy forceps of the present invention have the following advantages: first, the depth of myocardial biopsy can be precisely controlled by the rotary cutter; second, a sleeve body is installed on the outside of the rotary cutter, which can avoid iatrogenic damage caused by the rotary cutter during operation; third, the distal end of the sleeve body can be closed by a sealing component after sampling, which can prevent myocardial tissue from falling off, further improving the safety and effectiveness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 1 is a schematic front view of Example 1 of the rotary myocardial biopsy forceps of the present invention;

[0034] Figure 2 for Figure 1 A schematic diagram of the internal structure of the sleeve assembly of the rotary myocardial biopsy forceps, wherein the sealing assembly is located inside the sleeve body and is in a deformed state;

[0035] Figure 3 for Figure 2 A schematic top view of the sealing component of the rotary myocardial biopsy forceps in a changing state;

[0036] Figure 4 for Figure 3 A schematic side view of the closure assembly in FIG.

[0037] Figure 5 for Figure 2 A schematic top view of the sealing component of the rotary myocardial biopsy forceps in the initial state;

[0038] Figure 6 for Figure 1 A schematic diagram of the internal structure of the handle assembly of the rotary myocardial biopsy forceps;

[0039] Figure 7 Schematic side view of the sealing assembly of Example 2 of the rotary myocardial biopsy forceps of the present invention.

[0040] [Description of Reference Numerals]

[0041] 1: Sleeve assembly; 2: Catheter; 3: Handle assembly; 31: Handle body; 32: Push-pull ring; 33: Operating ring; 34: Closed sleeve; 35: Knurled high-head screw; 4: Sleeve body; 41: Inner cylinder; 42: Outer cylinder; 43: Compression spring; 5: Peeler; 6: Closing assembly; 61: First pipe section; 62: Second pipe section; 63: Closed pliers head; 7: Transmission wire; 8: Traction wire. DETAILED DESCRIPTION

[0042] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1:

[0044] Reference Figure 1 and Figure 2 This embodiment provides a rotary myocardial biopsy forceps, comprising a sleeve assembly 1, a catheter 2, a handle assembly 3, and a rotary cutter 5 located inside the sleeve assembly 1. The distal end of the handle assembly 3 is connected to the proximal end of the catheter 2, and the distal end of the catheter 2 is connected to the sleeve assembly 1.

[0045] The sleeve assembly 1 includes a sleeve body 4 and a closing assembly 6 disposed at the distal open end of the sleeve body 4 . The proximal end of the sleeve body 4 is connected to the catheter 2 . The rotary cutter 5 is slidably disposed inside the sleeve body 4 .

[0046] A first driving member is provided inside the catheter 2 , and the handle assembly 3 is connected to the rotary cutter 5 via the first driving member to drive the rotary cutter 5 to extend out of the sleeve body 4 and rotary cut the myocardial tissue.

[0047] A second driving component is provided inside the catheter 2 , and the handle assembly 3 is drivenly connected to the closing assembly 6 via the second driving component to control the closing assembly 6 to selectively open or close the opening at the distal end of the sleeve body 4 .

[0048] The rotary myocardial biopsy forceps of this embodiment offer the following three advantages: First, the sampling depth can be precisely controlled using the rotary blade 5 during myocardial biopsy. Second, a sleeve body 4 is mounted on the outer side of the rotary blade 5, which prevents iatrogenic damage caused by puncture during operation. Third, the distal end of the sleeve body 4 can be closed by a closure assembly 6 after sampling, preventing myocardial tissue removed by the rotary blade 5 from falling off and potentially causing embolism, further improving the safety and effectiveness of the procedure.

[0049] Preferably, the sleeve body 4 of this embodiment includes an inner cylinder 41 and an outer cylinder 42 that is sleeved around the outer cylinder 41. The proximal end surface of the outer cylinder 42 extends radially to connect to the proximal end surface of the inner cylinder 41, and the distal end of the conduit 2 is connected to the proximal end of the inner cylinder 41. The inner cylinder 41 accommodates the rotary cutter 5. The outer wall surface of the inner cylinder 41 and the inner wall surface of the outer cylinder 42 enclose an annular space. A portion of the sealing assembly 6 is housed in the annular space, and the other portion of the sealing assembly 6 can selectively open or close the distal end of the inner cylinder 41.

[0050] Combine Figure 3 、 Figure 4 and Figure 5 The closing assembly 6 of this embodiment includes a first pipe segment 61 and a second pipe segment 62. The distal end of the first pipe segment 61 is connected to the proximal end of the second pipe segment 62. The second pipe segment 62 is divided into at least two fan-ring structures along the circumferential direction, and a fan-shaped closing clamp head 63 is provided at the distal end of each fan-ring structure. The second pipe segment 62 is made of shape memory alloy and has an initial form and a variable shape. In the initial form, the distal end of the second pipe segment 62 expands radially outward, thereby driving the closing clamp head 63 to open the distal end of the inner cylinder 41. The second driving member pulls the second pipe segment 62 into the interior of the sleeve body 4. The second pipe segment 62 is restricted by the outer cylinder 42 and switches from the initial form to the variable shape. In the variable shape, the distal end of the second pipe segment 62 contracts radially inward, driving all the closing clamp heads 63 to combine to form a circular structure to seal the distal end of the inner cylinder 41.

[0051] Specifically, the second pipe section 62 of this embodiment is divided into two sector ring structures along the circumferential direction, and a semicircular closed clamp head 63 is provided at the distal end of each sector ring structure.

[0052] Preferably, when the distal end of the second tube section 62 of this embodiment contracts radially inward, it can drive each sealing forceps head 63 to squeeze the wound surface to seal the wound surface, thereby significantly reducing the risk of thromboembolism.

[0053] See also Figure 6 The handle assembly 3 of this embodiment includes a handle body 31 and a closed sleeve 34. The handle body 31 is connected to the proximal end of the catheter 2. The closed sleeve 34 is sheathed around the handle body 31. The second driving member is a traction wire 8. One end of the traction wire 8 is connected to the closed sleeve 34, and the other end of the traction wire 8 is connected to the first tube section 61. It is used to drive the closed assembly 6 to move proximally, switching from the initial configuration to the modified configuration, thereby controlling the closed assembly 6 to close the distal end of the inner cylinder 41.

[0054] Preferably, a compression spring 43 is provided in the annular space inside the sleeve body 4, and the compression spring 43 is used to drive the closing assembly 6 to move toward the distal side, switching from the changed form to the initial form, thereby controlling the distal end of the inner cylinder 41 of the closing assembly 6 to open.

[0055] Preferably, the handle assembly 3 further includes a knurled grub screw 35. The closed sleeve 34 is provided with a threaded hole, and the handle body 31 is provided with a positioning hole. The knurled grub screw 35 screws into the threaded hole of the closed sleeve 34, and the distal end of the knurled grub screw 35 can be selectively inserted into the positioning hole of the handle body 31 to axially position the closed sleeve 34. It should be noted that the knurled grub screw 35 can also be replaced by a positioning pin.

[0056] Preferably, the handle assembly 3 further comprises a push-pull ring 32. The first driving member is a transmission wire 7, the push-pull ring 32 is connected to one end of the transmission wire 7, and the other end of the transmission wire 7 is connected to the rotary cutter 5.

[0057] Preferably, the rotary cutter 5 is a circular hollow tubular cutter or a polygonal hollow tubular cutter. For example, the rotary cutter 5 can be a regular pentagonal, regular hexagonal or regular heptagonal hollow tubular cutter.

[0058] Preferably, an operating ring 33 is provided at the proximal end of the handle body 31. The operating ring 33 is provided for the convenience of the operator in holding the handle.

[0059] Preferably, the outer surfaces of the sleeve body 4, rotary cutter 5, and closure assembly 6 are coated with an ultra-slip coating. Specifically, the ultra-slip coating is a polyvinyl pyrrolidone ultra-slip coating with a thickness of 5 microns. The ultra-slip coating not only reduces friction during intravascular movement of the device but also enhances biocompatibility, reducing the risk of thrombosis and infection.

[0060] The use process of the rotary myocardial biopsy forceps of this embodiment is as follows: First, the sleeve assembly 1 is inserted into the cardiac cavity to be biopsied through peripheral vascular puncture. Second, the biopsy area is determined, and the closed sliding sleeve 34 on the handle body 31 is moved distally to reduce the pulling force on the sleeve body 4. The compression spring 43 pushes the sleeve body 4 distally, switching from the modified configuration to the initial configuration, thereby controlling the distal end of the inner cylinder 41 opened by the closing assembly 6. Third, the rotary cutter 5 is passed through the distal end of the sleeve body 4 via the push-pull ring 32 to perform rotary cutting and sampling of myocardial tissue. After the rotary cutting is completed, the rotary cutter 5 is retracted into the sleeve body 4 via the push-pull ring 32. Finally, the closed sliding sleeve 34 on the handle body 31 is used to pull the sleeve body 4 proximally, switching from the initial configuration to the modified configuration, thereby controlling the closing assembly 6 to close the distal end of the inner cylinder 41. Subsequently, the sleeve assembly 1 and catheter 2 are slowly withdrawn from the cardiac cavity, and the myocardial tissue sample remains within the sleeve body 4.

[0061] Example 2:

[0062] Reference Figure 7 This embodiment provides another rotary myocardial biopsy forceps. The difference from Example 1 is that the second tube segment 62 of the closing component 6 of this embodiment is divided into three fan-ring structures along the circumferential direction, and a fan-shaped closing forceps head 63 is provided at the distal end of each fan-ring structure.

[0063] In addition, the number of traction wires 8 of the rotary myocardial biopsy forceps in this embodiment is more than two, so as to improve the fault tolerance and safety of the rotary myocardial biopsy forceps and prevent the traction wire 8 from falling off from the sealing component 6, causing the sealing component 6 to open accidentally.

[0064] The rest of the details that are the same as those in Example 1 will not be repeated here.

[0065] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0066] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0067] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0068] In the description of this specification, the terms "one embodiment", "some embodiments", "embodiments", "examples", "specific examples" or "some examples" refer to the specific features, structures, materials or characteristics described in conjunction with the embodiment or example and included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples, unless they are mutually inconsistent.

[0069] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rotary myocardial biopsy forceps, characterized in that: The invention comprises a sleeve assembly (1), a catheter (2), a handle assembly (3) and a rotary cutter (5) located inside the sleeve assembly (1), wherein the distal end of the handle assembly (3) is connected to the proximal end of the catheter (2), and the distal end of the catheter (2) is connected to the sleeve assembly (1); The sleeve assembly (1) comprises a sleeve body (4) and a sealing assembly (6) arranged at the distal open end of the sleeve body (4); the proximal end of the sleeve body (4) is connected to the catheter (2); the rotary cutter (5) is slidably arranged inside the sleeve body (4); A first driving member is provided inside the catheter (2), and the handle assembly (3) forms a driving connection with the rotary cutter (5) through the first driving member, so as to drive the rotary cutter (5) to extend out of the sleeve body (4) and rotary cut the myocardial tissue; A second driving component is provided inside the catheter (2), and the handle assembly (3) forms a driving connection with the closing assembly (6) through the second driving component, so as to control the closing assembly (6) to selectively open or close the opening at the distal end of the sleeve body (4).

2. The rotary myocardial biopsy forceps according to claim 1, wherein: The sleeve body (4) comprises an inner cylinder (41) and an outer cylinder (42) sleeved on the periphery of the inner cylinder (41); The proximal end surface of the outer cylinder (42) extends radially to connect with the proximal end surface of the inner cylinder (41), the distal end of the conduit (2) is connected to the proximal end of the inner cylinder (41), the inner cylinder (41) accommodates the rotary cutter (5), the outer wall surface of the inner cylinder (41) and the inner wall surface of the outer cylinder (42) enclose an annular space, a part of the sealing component (6) is accommodated in the annular space, and the other part of the sealing component (6) can selectively open or close the distal end of the inner cylinder (41).

3. The rotary myocardial biopsy forceps according to claim 2, wherein: The closure assembly (6) includes a first pipe section (61) and a second pipe section (62); The distal end of the first pipe section (61) is connected to the proximal end of the second pipe section (62), and the second pipe section (62) is divided into at least two fan-shaped ring structures along the circumferential direction, and a fan-shaped closed clamp head (63) is provided at the distal end of each fan-shaped ring structure; The second tube section (62) is made of a shape memory alloy and has an initial shape and a variable shape. In the initial shape, the distal end of the second tube section (62) expands radially outward, thereby driving the closing clamp head (63) to open the distal end of the inner cylinder (41); The second driving member pulls the second pipe section (62) into the interior of the sleeve body (4). The second pipe section (62) is restricted by the outer cylinder (42) and switches from an initial shape to a changed shape. In the changed shape, the distal end of the second pipe section (62) contracts radially inward, driving the closing clamp head (63) to seal the distal end of the inner cylinder (41).

4. The rotary myocardial biopsy forceps according to claim 3, characterized in that: When the distal end of the second tube section (62) contracts radially inward, it can drive each sealing forceps head (63) to squeeze the wound surface to seal the wound surface.

5. The rotary myocardial biopsy forceps according to claim 3, characterized in that: The handle assembly (3) comprises a handle body (31) and a closed sliding sleeve (34); The handle body (31) is connected to the proximal end of the catheter (2), and a closed sleeve (34) is provided on the periphery of the handle body (31). The second driving member is a traction wire (8), one end of the traction wire (8) is connected to the closed sleeve (34), and the other end of the traction wire (8) is connected to the first pipe section (61), so as to drive the closed component (6) to move toward the proximal side and switch from the initial form to the changed form.

6. The rotary myocardial biopsy forceps according to claim 5, characterized in that: A compression spring (43) is provided in the annular space inside the sleeve body (4), and the compression spring (43) is used to drive the sealing component (6) to move toward the distal side, switching from the changed form to the initial form.

7. The rotary myocardial biopsy forceps according to claim 6, characterized in that: The handle assembly (3) further comprises a knurled high head screw (35); A threaded hole is provided on the closed sleeve (34), and a positioning hole is provided on the handle body (31). The knurled high head screw (35) is screwed into the threaded hole on the closed sleeve (34), and the end of the knurled high head screw (35) can be selectively plugged into the positioning hole on the handle body (31) to axially position the closed sleeve (34).

8. The rotary myocardial biopsy forceps according to claim 1, wherein: The handle assembly (3) further includes a push-pull ring (32); The first driving member is a transmission wire (7), the push-pull ring (32) is connected to one end of the transmission wire (7), and the other end of the transmission wire (7) is connected to the rotary cutter (5).

9. The rotary myocardial biopsy forceps according to claim 1, characterized in that: The rotary cutter (5) is a circular or polygonal hollow tubular cutter.

10. The rotary myocardial biopsy forceps according to any one of claims 1 to 9, characterized in that: The outer surfaces of the sleeve body (4), the rotary cutter (5) and the closing component (6) are coated with a super-slip coating.

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