Myocardial biopsy system and use method

Abstract

The invention provides a myocardial biopsy system and a using method.The myocardial biopsy system comprises a sheathing canal assembly and a sampling assembly, the sheathing canal assembly comprises a sheathing canal, a detector and a sheathing canal wire, the detector is arranged at the head end of the sheathing canal, the sheathing canal wire is arranged between the inner wall and the outer wall of the sheathing canal, and the sampling assembly is arranged between the sheathing canal and the sheathing canal wire. One end of the sheathing canal wire is connected with the detector, the other end of the sheathing canal wire is connected with the circuit board, and the circuit board is arranged at the tail end of the sheathing canal; the sampling assembly comprises a double-screw blade and a sampling wire, one end of the sampling wire is connected with the double-screw blade, the other end of the sampling wire penetrates out of the tail end of the sheath tube, and the double-screw blade penetrates into the sheath tube from the tail end of the sheath tube and penetrates out of the head end of the sheath tube. The double-screw blade can rotate, so that accidental injury to surrounding normal tissues is avoided, and the sampling accuracy and success rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of endomyocardial biopsy, and in particular to an endomyocardial biopsy system and a usage method thereof. Background Art

[0002] Endomyocardial Biopsy (EMB) is an invasive diagnostic method that obtains myocardial tissue samples through catheterization technology for pathological examination, mainly used to clarify the etiology of myocardial lesions, evaluate disease activity, and guide treatment. According to the sampling site, endomyocardial biopsy can be divided into:

[0003] 1. Right ventricular biopsy. A sheath is placed through the right internal jugular vein, and a Scholten or Caves biopsy forceps is used to clamp the tissue on the right ventricular surface of the interventricular septum under X-ray / ultrasound guidance; or the Seldinger method is used to puncture the femoral vein, and the catheter is guided to the right ventricle through a guide wire, and a King biopsy forceps is used for sampling.

[0004] 2. Left ventricular biopsy. The catheter is retrogradely inserted through the femoral artery or radial artery and enters the left ventricle through the aortic valve; or enters the left ventricle after puncturing the interatrial septum.

[0005] The sampling instruments include Konno-Sakakibara forceps, Scholten forceps, King forceps, etc., and different forceps types are suitable for different ventricles and paths.

[0006] Although the endomyocardial biopsy technology is mature, the existing instruments and methods still have significant limitations, restricting its clinical application scope and diagnostic accuracy. For example:

[0007] The closing force of the traditional forceps head is uneven or the sharpness is insufficient, which easily causes tissue extrusion and deformation, affecting the accuracy of pathological diagnosis. The delivery rod of the traditional endomyocardial biopsy forceps is thicker and harder in texture, with poor compliance, and the forceps head end cannot turn flexibly, which easily leads to repeated clamping of myocardial tissue at a certain site, increasing the risk of perforation. Summary of the Invention

[0008] The purpose of the present invention is to provide an endomyocardial biopsy system and a usage method thereof that improve the accuracy and effectiveness of biopsy in view of the deficiencies in the prior art.

[0009] To achieve the above purpose, the present invention provides the following technical solutions:

[0010] An endomyocardial biopsy system, comprising:

[0011] Sheath tube assembly, the sheath tube assembly includes a sheath tube, a detector and a sheath tube wire. A detector is provided at the head end of the sheath tube. The sheath tube wire is arranged between the inner wall and the outer wall of the sheath tube. One end of the sheath tube wire is connected to the detector, and the other end of the sheath tube wire is connected to a circuit board. The circuit board is arranged at the tail end of the sheath tube;

[0012] Sampling assembly, the sampling assembly includes a double - helix blade and a sampling wire. One end of the sampling wire is connected to the double - helix blade, and the other end of the sampling wire passes out from the tail end of the sheath tube. The double - helix blade penetrates into the sheath tube from the tail end of the sheath tube and passes out from the head end of the sheath tube. The double - helix blade can rotate.

[0013] As a preferred embodiment, the double - helix blade includes:

[0014] Titanium alloy body;

[0015] Titanium nitride coating, the titanium nitride coating is arranged on the outer surface of the titanium alloy body.

[0016] As a preferred embodiment, the sampling wire includes:

[0017] Shaft body, the shaft body is rigidly connected to the double - helix blade;

[0018] Coil, the coil is wound on the surface of the shaft body, and the cathode of the coil is connected to the double - helix blade.

[0019] As a preferred embodiment, the detector includes:

[0020] Multiple electrodes, the multiple electrodes are arranged at intervals along the circumferential direction of the sheath tube.

[0021] As a preferred embodiment, an annular support is provided at the head end of the sheath tube, and the detector is arranged on the annular support.

[0022] As a preferred embodiment, the sheath tube assembly further includes:

[0023] Signal processing unit, the signal processing unit is arranged on the outer periphery of the tail end of the sheath tube, and the signal processing unit is connected between the circuit board and the display screen.

[0024] As a preferred embodiment, the signal processing unit includes a pre - amplifier, a band - pass filter and an AD converter, and the detector, the pre - amplifier, the band - pass filter and the AD converter are connected in sequence.

[0025] As a preferred embodiment, a side tube is provided on the outer wall of the sheath tube. The side tube is communicated with the inside of the sheath tube. The side tube is used for introducing cleaning liquid, and the side tube is adjacent to the tail end of the sheath tube.

[0026] As a preferred embodiment, a check valve is provided at the tail end of the sheath tube, and the sampling wire passes through the check valve.

[0027] The present invention also provides a method for using a myocardial biopsy system, the myocardial biopsy system including a sheath tube assembly and a sampling assembly, and the method for using including the following steps:

[0028] Scanning by using the detector at the head end of the sheath tube assembly of the sheath tube assembly to lead the head end of the sheath tube to the position where the target sampling tissue is located;

[0029] Insert the double - helix blade of the sampling assembly into the inside of the sheath tube from the tail end of the sheath tube, and send it to the head end of the sheath tube under the guidance of fluoroscopy, and rotate the double - helix blade to sample the target sampling tissue.

[0030] Compared with the prior art, the present technical solution has the following advantages:

[0031] An annular support is provided at the head end of the sheath tube, which increases the rigidity and strength of the head end of the sheath tube and also provides a stable installation platform for the detector.

[0032] The annular support effectively disperses pressure, reduces the probability of heart perforation, and greatly improves the safety of endomyocardial biopsy.

[0033] The effective combination of the double - helix blade and the detector realizes the precise operation of side - by - side sampling.

[0034] The coil wound on the shaft body provides real - time electrophysiological multi - parameter feedback, breaking through the limitation of traditional biopsy relying on experience. Description of the Drawings

[0035] Figure 1 It is a sectional view of the sheath tube assembly of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the sheath tube assembly of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the head end of the sheath tube of the present invention;

[0038] Figure 4 It is a structural schematic diagram of the sampling assembly of the present invention.

[0039] In the figure: 100 sheath tube assembly, 110 sheath tube, 111 annular support, 112 side tube, 120 detector, 121 electrode, 130 sheath tube wire, 200 sampling assembly, 210 double - helix blade, 220 sampling wire, 221 shaft body, 222 coil. Detailed Embodiments

[0040] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0041] First Embodiment

[0042] As Figure 1 and Figure 4 shown, the myocardial biopsy system includes:

[0043] A sheath assembly 100, which includes a sheath 110, a detector 120, and a sheath wire 130. A detector 120 is provided at the head end of the sheath 110. The sheath wire 130 is disposed between the inner wall and the outer wall of the sheath 110. One end of the sheath wire 130 is connected to the detector 120, and the other end of the sheath wire 130 is connected to a circuit board, and the circuit board is disposed at the tail end of the sheath 110;

[0044] A sampling assembly 200, which includes a double - helix blade 210 and a sampling wire 220. One end of the sampling wire 220 is connected to the double - helix blade 210. The other end of the sampling wire 220 passes out of the tail end of the sheath 110. The double - helix blade 210 penetrates into the sheath 110 from the tail end of the sheath 110 and passes out of the head end of the sheath 110, and the double - helix blade 210 can rotate.

[0045] The sheath 110 serves as the channel for the entire sampling process, providing a path for the sampling assembly 200 to enter and exit the myocardial tissue, playing a guiding role. The detector 120 is provided at the head end of the sheath 110 for detecting local myocardial impedance and action potential waveforms. The sheath wire 130 is arranged between the inner wall and the outer wall of the sheath 110, with one end connected to the detector 120 and the other end connected to the circuit board, realizing the signal transmission between the detector 120 and the external circuit board, ensuring that the detection data can be recorded and analyzed in a timely and accurate manner to mark the recommended biopsy target (i.e., the target myocardial tissue). The unique double - helix design of the double - helix blade 210 can achieve precise cutting of the target myocardial tissue during rotation, effectively reducing damage to surrounding tissues. One end of the sampling wire 220 that passes out of the tail end of the sheath 110 can be held by the doctor, that is, by rotating the sampling wire 220 to drive the double - helix blade 210 to rotate.

[0046] By precisely controlling the rotation and insertion / withdrawal of the double - helix blade 210, precise cutting of the target myocardial tissue can be achieved, avoiding accidental injury to the surrounding normal tissues and improving the accuracy and success rate of sampling. The detector 120 on the sheath assembly 100 detects local myocardial impedance and action potential waveforms, and the doctor can determine the target myocardial tissue based on the feedback information. At the same time, the design of the double - helix blade 210 reduces the situation of clamping the same part multiple times, further ensuring operation safety. Compared with traditional biopsy forceps, the sheath assembly 100 and the sampling assembly 200 of this system have a more reasonable structure. The design of the sheath 110 takes into account the compliance problem of the delivery rod, improving the operation flexibility of the instrument in myocardial tissue. The sharpness and cutting effect of the double - helix blade 210 are better than those of traditional forceps heads, reducing tissue extrusion deformation and being beneficial to pathological diagnosis.

[0047] As Figure 1 shown, the sheath 110 is generally in a tubular structure, with both ends in the length direction being open for the entry and exit of the sampling assembly 200. The sheath 110 can be made of nitinol alloy and has flexible characteristics, capable of flexibly turning in complex blood vessels or myocardial cavities, reducing friction and damage to tissues.

[0048] The dimensions such as the diameter and length of the sheath 110 can be designed according to usage requirements. In this embodiment, the outer diameter of the sheath 110 is 7.0Fr, approximately 2.33mm, and this design takes into account both the passing - through performance of the sampling assembly 200 and the flexibility of the sheath.

[0049] As Figure 1 and Figure 3 shown, by increasing the wall thickness at the head end of the sheath 110, the annular support 111 is constructed. The annular support 111 increases the rigidity and strength of the head end of the sheath 110, provides operation stability, and facilitates pushing. In addition, the annular support 111 provides a stable installation platform for the detector 120, ensuring that the detector 120 always maintains the correct position and posture during operation to detect local myocardial impedance and action potential waveforms. A platinum - iridium alloy marker ring can also be embedded in the annular support 111 to be clearly visible under X - ray or ultrasound for auxiliary positioning.

[0050] Referring to Figure 3 , the detector 120 includes:

[0051] Multiple electrodes 121, and the multiple electrodes 121 are arranged at intervals along the circumferential direction of the sheath 110.

[0052] The electrode 121 can be a platinum-iridium alloy microelectrode with a diameter of 0.1 mm. Platinum-iridium alloy has excellent corrosion resistance and biocompatibility, which can avoid inflammation or allergic reactions caused by long-term contact with myocardial tissue. Platinum-iridium alloy has stable conductivity, and the surface oxide layer can inhibit electrochemical corrosion. Even with a microelectrode diameter of 0.1 mm, it can still maintain anti-bending properties.

[0053] In this embodiment, the number of the electrodes 121 is eight. The eight electrodes 121 are arranged at intervals along the circumferential direction of the sheath 110, and the interval between two adjacent electrodes 121 is 1 mm. The eight electrodes distributed at intervals of 1 mm along the circumference of the sheath 110 can form a 360° electric field coverage, synchronously record the electrical activities of myocardial cells in different directions during myocardial biopsy, and assist in locating abnormal electrical conduction regions to distinguish healthy and diseased tissues.

[0054] As Figure 1 shown, the sheath wire 130 is arranged between the inner wall and the outer wall of the sheath 110. One end of the sheath wire 130 is connected to the detector 120, and the other end of the sheath wire 130 is connected to a circuit board.

[0055] The connection part of the sheath wire 130 and the detector 120 is hidden between the inner wall and the outer wall of the sheath 110, that is, the sheath wire 130 is not exposed at the head end of the sheath 110. By physically isolating the sheath wire 130, the safety and reliability of the medical catheter in a complex surgical environment are significantly improved.

[0056] The circuit board can be a flexible printed circuit (FPC). It is a highly reliable printed circuit board made of polyimide or polyester film as the substrate, which can be freely bent and folded. It has the characteristics of high wiring density, light weight, thin thickness, and good bending properties. The circuit board can be wound around the outer periphery of the distal end of the sheath 110 or embedded inside the distal end of the sheath 110 to avoid occupying the internal space of the sheath 110.

[0057] The sheath assembly 100 further includes:

[0058] A signal processing unit, which is arranged on the outer periphery of the tail end of the sheath 110, and the signal processing unit is connected between the circuit board and the display screen.

[0059] The electrical signals collected by the detector 120 are transmitted to the signal processing unit through the circuit board, then processed by the signal processing unit, and then transmitted to the display screen and displayed by the display screen, so that medical staff can intuitively see the target myocardial tissue.

[0060] The signal processing unit includes a preamplifier, a band-pass filter, and an AD converter, and the detector, preamplifier, band-pass filter, AD converter, and display screen are connected in sequence.

[0061] The preamplifier amplifies the electrical signal collected by the detector 120 by 1000 times to meet the input requirements of the subsequent circuit. The band-pass filter suppresses electromyogram interference and high-frequency noise while retaining the high-frequency components of the action potential. The AD converter converts the electrical signal into a digital signal.

[0062] Through the modular cascaded design of preamplification - band-pass filter - AD converter, the signal processing unit constructs a high-fidelity link from myocardial electrophysiological signal acquisition to digital quantization, providing a reliable data basis for subsequent intelligent analysis (such as arrhythmia classification, ablation target location), and then being displayed by the display screen. The display screen can be a 3D navigation display screen.

[0063] As Figure 2 shown, the head end of the sheath tube 110 is bent in the initial state, realizes elastic memory through a pre-shaping process (such as nitinol heat setting), and then is introduced into the ventricle using the guide wire. After the guide wire is withdrawn, the head end of the sheath tube 110 automatically returns to the bent state, and the outer wall of the sheath tube 110 with a large arc bend gently contacts the endocardium.

[0064] As Figure 4 shown, the double helix blade 210 includes:

[0065] A titanium alloy body;

[0066] A titanium nitride coating, and the titanium nitride coating is provided on the outer surface of the titanium alloy body.

[0067] Through the composite structure design of the titanium alloy body and the titanium nitride coating, the double helix blade 210 realizes the balance of high strength, high wear resistance and biocompatibility, significantly improving the cutting efficiency, tissue adaptability and instrument life in interventional surgeries such as myocardial sampling. By rotating the double helix blade 210 to cut the target myocardial tissue, a cylindrical target myocardial tissue with a depth of 5 - 8 mm can be obtained. The rotation method of the double helix blade 210 is different from the clamping method of biopsy forceps in the prior art, reducing the lateral tearing of the tissue and lowering the risk of perforation. The pitch and rotation speed are matched to ensure the integrity of the sampled target myocardial tissue.

[0068] The pitch, diameter and other dimensions of the titanium alloy body can be selected according to the usage requirements. In this embodiment, the pitch of the titanium alloy body is 0.5 mm and the diameter is 1.8 mm.

[0069] The double helix blade 210 is composed of two sets of left-handed and right-handed helical lines, symmetrically distributed on both sides of the tool axis, improving the cutting efficiency.

[0070] As Figure 4 shown, the sampling wire 220 includes:

[0071] A shaft body 221, which is rigidly connected to the double - helix blade 210;

[0072] A coil 222, which is wound around the surface of the shaft body 221, and the cathode of the coil 222 is connected to the double - helix blade 210.

[0073] The shaft body 221 is made of polytetrafluoroethylene (PTFE), and its diameter is not greater than that of the double - helix blade 210. The head end of the shaft body 221 is rigidly connected to the double - helix blade 210, and the tail end of the shaft body 221 passes through the tail end of the sheath tube 110. The doctor applies a rotational force by holding the tail end of the shaft body 221 to drive the double - helix blade 210 to rotate.

[0074] The cathode of the coil 222 is connected to the double - helix blade 210. The double - helix blade 210 serves as the injection end of the high - frequency current and conducts the current into the myocardial tissue through physical contact. The anode of the coil 222 contacts the skin tissue of the patient's chest wall through a body surface electrode to form a closed loop. This design uses the human body as the current return path to ensure that an effective electric field is formed in the myocardial tissue. It also externally connects a multi - conductive mapping system through an alligator clip connecting wire, and the multi - conductive mapping system will analyze impedance, potential data, etc. in real - time. Specifically, based on the change in myocardial tissue conductivity, the coil can measure myocardial impedance in real - time, reflecting pathological states such as myocardial edema and fibrosis. Capture the transient ion current generated by the rupture of the cell membrane during the cutting process to indicate the cutting depth and myocardial tissue damage. Record the action potential generated by myocardial cell depolarization to evaluate the active state of the sampled myocardium.

[0075] It also synchronously records myocardial electrical activities through the detector 120. Combining with the three - dimensional positioning algorithm of the 3D navigation display screen, it can generate a myocardial electric field distribution map in real - time, and can measure myocardial tissue perception, impedance, injury current, etc. in real - time to indicate the degree of myocardial lesions and the depth and position of the spiral head end, so as to prevent the double - helix blade 210 from penetrating the interventricular septum into the left ventricular cavity, and can analyze the active state of the sampled myocardium at any time.

[0076] As Figure 1 shown, a side tube 112 is provided on the outer wall of the sheath tube 110. The side tube 112 is in communication with the inside of the sheath tube 110. The side tube 112 is used for introducing the cleaning liquid, and the side tube 112 is adjacent to the tail end of the sheath tube 110.

[0077] The side tube 112 is inclined relative to the sheath tube 110, and the included angle between them in the direction towards the tail end of the sheath tube 110 is 15° - 30°. The side tube 112 is connected to an external heparin salt water pump through a pipeline, and the external heparin salt water pump injects at a flow rate of 5 mL / min to prevent blood clot formation and flush the sampling area, reducing the embolism risk. It is mainly used during left ventricular myocardial biopsy.

[0078] Reference Figure 1 , a check valve is provided at the tail end of the sheath tube 110, and the sampling wire 220 passes through the check valve. By setting the check valve, it is possible to prevent blood and the like from flowing back along the sheath tube 110 to the outside of the body.

[0079] In summary, a circular support 111 is provided at the head end of the sheath tube 110, which increases the rigidity and strength of the head end of the sheath tube 110 and also provides a stable installation platform for the detector 120. The circular support 111 effectively disperses the pressure and reduces the probability of cardiac perforation by 75%, greatly improving the safety of endomyocardial biopsy. The effective combination of the double - helix blade 210 and the detector 120 realizes precise operation of sampling while advancing. The coil 222 wound around the shaft body 221 provides real - time electrophysiological multi - parameter feedback, breaking through the limitation of traditional biopsy relying on experience. In addition, the sheath tube assembly 100 and the sampling assembly 200 can adopt different size models, for example, the double - helix blade 210 can be quickly replaced to adapt to different clinical scenarios such as children or hypertrophic cardiomyopathy.

[0080] Second embodiment,

[0081] As Figure 1 and Figure 4 shown, for the usage method of the myocardial biopsy system, the myocardial biopsy system includes a sheath tube assembly 100 and a sampling assembly 200, and the usage method includes the following steps:

[0082] Step 1: Use the detector 120 at the head end of the sheath tube 110 of the sheath tube assembly 100 to scan, and lead the head end of the sheath tube 110 to the position where the target sampling tissue is located.

[0083] Step 2: Insert the double - helix blade 210 of the sampling assembly 200 into the sheath tube 110 from the tail end of the sheath tube 110, and send it to the head end of the sheath tube 110 under the guidance of X - ray fluoroscopy, and rotate the double - helix blade 210 to sample the target sampling tissue.

[0084] The usage method can be applied to biopsy of the right ventricular septum. Before step 1, the usage method further includes preoperative preparation, and the preoperative preparation includes:

[0085] Centering on the puncture point, perform routine disinfection and draping. After puncturing a vein (femoral vein / internal jugular vein / cephalic vein / subclavian vein), send a guide wire into the right heart.

[0086] Slide the sheath assembly 100 along the guide wire into the right ventricle. Under fluoroscopy, position the distal end of the sheath 110 of the sheath assembly 100 against the right ventricular septal surface.

[0087] The described usage method can be applied to left ventricular free wall biopsy. Before step one, the usage method further includes preoperative preparation, which includes:

[0088] Puncture the radial artery or femoral artery and insert a guide wire into the left heart.

[0089] Slide the sheath assembly 100 along the guide wire into the left ventricle. Use fluoroscopy to confirm the position of the distal end of the sheath 110. Connect an external heparinized saline pump to the side tube 112 to prevent thrombus formation and flush the sampling area.

[0090] In step two, the multiple circumferentially spaced electrodes 121 of the detector 120 scan the local impedance of different parts of the right ventricular septum, left ventricular free wall, or apex, identify low voltage areas or abnormal activation areas, and generate an electrophysiological heat map using a 3D navigation display screen to mark the recommended biopsy target points (i.e., the target myocardial tissue).

[0091] In step three, in addition to sampling the target tissue by rotating the double - helix blade 210, connect the cathode of the coil 222 to the double - helix blade 210, and make the anode of the coil 222 contact the skin tissue of the patient's chest wall through a body surface electrode to form a closed loop, so as to measure the form of injury current, voltage, local myocardial perception, etc. during the advancement of the double - helix blade 210 in real - time to avoid perforation.

[0092] After step two, the method further includes the following steps:

[0093] Withdraw the sampling wire 220, retract the double - helix blade 210 with the target myocardial tissue into the sheath 110, and take out the sampling assembly 200 from the distal end of the sheath 110. Then separate and obtain the target myocardial tissue on the double - helix blade 210 for subsequent analysis.

[0094] The above - described embodiments are only used to illustrate the technical ideas and features of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of the patent adoption of the present invention cannot be limited only by these embodiments. That is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the scope of the patent of the present invention.

Claims

1. A myocardial biopsy system, characterized in that: include: A sheath tube assembly (100), the sheath tube assembly (100) comprising a sheath tube (110), a detector (120) and a sheath tube wire (130), wherein the detector (120) is arranged at the head end of the sheath tube (110), the sheath tube wire (130) is arranged between the inner wall and the outer wall of the sheath tube (110), one end of the sheath tube wire (130) is connected to the detector (120), and the other end of the sheath tube wire (130) is connected to a circuit board, and the circuit board is arranged at the tail end of the sheath tube (110); A sampling assembly (200), the sampling assembly (200) comprising a double helical blade (210) and a sampling wire (220), one end of the sampling wire (220) being connected to the double helical blade (210), the other end of the sampling wire (220) passing through the rear end of the sheath tube (110), the double helical blade (210) passing into the sheath tube (110) from the rear end of the sheath tube (110) and passing through the head end of the sheath tube (110), the double helical blade (210) being able to rotate.

2. The myocardial biopsy system according to claim 1, characterized in that: The double helical blade (210) comprises: Titanium alloy body; A titanium nitride coating is disposed on the outer surface of the titanium alloy body.

3. The myocardial biopsy system according to claim 1, characterized in that: The sampling wire (220) comprises: A shaft body (221), wherein the shaft body (221) is rigidly connected to the double helical blade (210); A coil (222), wherein the coil (222) is wound on the surface of the shaft (221), and a cathode of the coil (221) is connected to the double helical blade (210).

4. The myocardial biopsy system according to claim 1, characterized in that: The detector (120) comprises: A plurality of electrodes (121) are arranged at intervals along the circumferential direction of the sheath tube (110).

5. The myocardial biopsy system according to claim 1, characterized in that: The head end of the sheath tube (110) is provided with an annular support (111), and the detector (120) is arranged on the annular support (111).

6. The myocardial biopsy system according to claim 1, characterized in that: The sheath tube assembly (100) further comprises: A signal processing unit is arranged on the outer periphery of the rear end of the sheath tube (110), and the signal processing unit is connected between the circuit board and the display screen.

7. The myocardial biopsy system according to claim 6, characterized in that: The signal processing unit comprises a preamplifier, a bandpass filter and an AD converter, and the detector, the preamplifier, the bandpass filter and the AD converter are connected in sequence.

8. The myocardial biopsy system according to claim 1, characterized in that: A side tube (112) is provided on the outer wall of the sheath tube (110). The side tube (112) is connected to the interior of the sheath tube (110) and is used for introducing a cleaning liquid. The side tube (112) is adjacent to the rear end of the sheath tube (110).

9. The myocardial biopsy system according to claim 8, characterized in that: A check valve is provided at the rear end of the sheath tube (110), and the sampling wire (220) passes through the check valve.

10. A method for using the myocardial biopsy system according to any one of claims 1 to 9, characterized in that: The method of use comprises the following steps: Using a detector (120) at the head end of the sheath tube (110) of the sheath tube assembly (100) to scan, the head end of the sheath tube (110) is guided to the location where the target sampling tissue is located; The double helical blade (210) of the sampling assembly (200) is inserted into the interior of the sheath tube (110) from the rear end of the sheath tube (110), and is sent to the head end of the sheath tube (110) under the guidance of X-ray fluoroscopy, and the double helical blade (210) is rotated to sample the target sampling tissue.

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