Radiofrequency cutting biopsy needle and biopsy needle use method

Abstract

The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle. The radio frequency cutting biopsy needle comprises an outer knife tube, an inner knife tube, an air return assembly, a radio frequency cutting device and a driving mechanism. A sampling groove is provided on the side wall of the outer knife tube. The ablation end of the radio frequency cutting device is arranged at the distal end of the inner knife tube. The distal end of the inner knife tube is inserted into the outer knife tube. An air flow channel connected to the sampling groove is arranged between the inner knife tube and the outer knife tube, so that the inner knife tube can move linearly relative to the outer knife tube. The proximal end of the inner knife tube is configured to be connected to a negative pressure device. One end of the air return assembly is movably sleeved on the outside of the outer knife tube, and the other end of the air return assembly is sleeved on the proximal end of the inner knife tube. The driving mechanism is transmission-connected to the inner knife tube, so that the biopsy needle generates negative pressure through the sampling groove under the action of the negative pressure device to adsorb tissue, thereby ensuring the tissue adsorption and fixation effect. By moving the air return assembly, the sampling groove is connected to the external environment, which is convenient for removing the cut tissue and improving the surgical effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a radio frequency cutting biopsy needle and a method for using the biopsy needle. Background Art

[0002] The vacuum-assisted breast biopsy system is a minimally invasive medical device in breast surgery and is used in clinical practice. The system consists of a control system, a breast biopsy resectoscope, and a vacuum negative pressure system. The breast biopsy resectoscope consists of an outer cover, a puncture knife, a cutting knife tube, an outer tube, a sampling slot, a sample collector, a vacuum catheter kit, etc. It mainly uses a vacuum-assisted device to suck the diseased tissue into the sampling slot through vacuum negative pressure. The cutting knife tube quickly rotates to cut the diseased tissue sucked into the sampling slot. After cutting, the diseased tissue is sucked into the sample collector again through negative pressure. Doctors can take samples from the sample collector for pathological biopsy, and judge whether the breast diseased tissue is benign or malignant through pathological analysis of the diseased tissue samples. The entire operation only requires making a hole in the breast to complete. At the same time, the vacuum-assisted breast biopsy system can also be used for minimally invasive resection of benign tumors.

[0003] When the vacuum-assisted breast biopsy system is working, it is necessary to use a vacuum-assisted device to generate negative pressure suction at the sampling slot to adsorb the patient's lesion tissue into the sampling slot. Existing vacuum-assisted biopsy systems usually set the sampling slot to be connected to the external gas so that the vacuum-assisted device can remove the cut tissue in time, and the negative pressure at the sampling slot cannot be adjusted. This results in the sampling slot of the outer tube being unable to absorb enough lesion tissue at one time, and the initial fixation of the outer tube cannot be achieved.

[0004] Therefore, the present invention is dedicated to providing a radio frequency cutting biopsy needle and a method for using the biopsy needle to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a radio frequency cutting biopsy needle and a method for using the biopsy needle. By moving the air return component relative to the outer knife tube, the negative pressure at the sampling slot is adjusted to achieve adsorption and fixation of the sampling slot and adsorption and removal of lesion tissue. The design is ingenious, the structure is simple, and the operation is convenient.

[0006] The technical solution provided by the present invention is as follows:

[0007] A radio frequency cutting biopsy needle comprises an outer blade tube, an inner blade tube, an air return assembly, a radio frequency cutting device and a driving mechanism. A sampling groove is provided on the side wall of the outer blade tube, and the ablation end of the radio frequency cutting device is arranged at the distal end of the inner blade tube.

[0008] The distal end of the inner knife tube is inserted into the outer knife tube, and an air flow channel connected to the sampling groove is arranged between the inner knife tube and the outer knife tube to allow the inner knife tube to move linearly relative to the outer knife tube, and the proximal end of the inner knife tube is configured to be connected to a negative pressure device.

[0009] One end of the air return assembly is movably sleeved on the outer side of the outer knife tube, the other end of the air return assembly is sleeved on the proximal end of the inner knife tube, and the driving mechanism is drivingly connected to the inner knife tube.

[0010] Among them, the return air component has an initial position relative to the outer knife tube. When the return air component is in the initial position, the air flow channel is not connected to the external environment, and after the driving mechanism drives the inner knife tube to move a preset distance to the far end, the driving mechanism drives the inner knife tube and the return air component to move, so that the return air component is away from the initial position, thereby making the air flow channel connected to the external environment.

[0011] In some embodiments, the air return assembly includes a sealing tank, one end of which is movably mounted on the outside of the outer knife tube, the other end of the sealing tank is sealed and connected to the proximal end of the inner knife tube, and an air flow gap suitable for communicating with the external environment is provided at the connection between the sealing tank and the outer knife tube, and the air flow channel is connected to the interior of the sealing tank.

[0012] The outer side of the outer knife tube is sleeved with a first seal, which is located in the sealing can. When the sealing can is in the initial position, the first seal is located at the airflow gap so that the airflow channel is not connected to the external environment.

[0013] In some embodiments, a fixing seat is provided on the outer knife tube and is located on a side of the sealing tank close to the sampling slot. The return air assembly also includes an elastic member arranged between the fixing seat and the fixing seat, and the elastic member is in a compressed state so that the sealing tank is in an initial position.

[0014] In some embodiments, the air return assembly further includes a second seal, which is located at an end of the sealing tank away from the fixing seat, so that the sealing tank and the inner knife tube are tightly connected.

[0015] In some embodiments, when the air return assembly moves from the initial position toward a direction close to the outer knife tube, the ablation end of the radio frequency cutting device is located in the sampling groove.

[0016] In some embodiments, the RF cutting device includes an electrode and an insulating blade head disposed at the distal end of the inner blade tube, the insulating blade head is cylindrical and connected to the inner blade tube, the electrode is disposed at one end of the insulating blade head away from the inner blade tube to form the ablation end, and the electrode is connected to a RF generating device.

[0017] A plurality of through holes are provided on the side wall of the insulating blade head, so that the air flow channel can be connected with the sampling slot through the through holes.

[0018] In some embodiments, the insulating blade head includes a first part and a second part connected in sequence, and an end of the second part away from the first part is connected to the inner blade tube.

[0019] The outer diameter of the first part is greater than the outer diameter of the second part, and the first part is loosely matched with the outer knife tube.

[0020] In some embodiments, a mounting groove matching with the electrode is provided on a side of the insulating blade head away from the inner blade tube, so that the electrode can be installed in the mounting groove.

[0021] The insulating blade head and the inner blade tube are both provided with cable channels for connecting the electrode to the radio frequency generating device through a wire.

[0022] In some embodiments, a first step portion is provided at the inner wall of the distal end of the inner blade tube, and a second step portion matching the first step portion is provided at the outer wall of the proximal end of the insulating blade head, so that the insulating blade head can be installed at the distal end of the inner blade tube;

[0023] The cable channel of the insulating cutter head is arranged through the side wall of the insulating cutter head, and the cable channel of the inner cutter tube is arranged through the side wall of the inner cutter tube.

[0024] In some embodiments, it further includes a shell and a puncture knife, wherein the puncture knife is fixedly connected to the distal end of the outer knife tube, the shell is arranged at an end of the outer knife tube away from the puncture knife, and the drive mechanism is installed in the shell.

[0025] In some embodiments, the distal end of the outer blade tube and the air return assembly are both installed in the housing, and the housing is provided with an air hole connected to the external environment;

[0026] The driving mechanism comprises a motor and a slider, wherein the slider is fixed on the outside of the inner knife tube, and the output end of the motor is transmission-connected with the slider to drive the slider and the inner knife tube to move.

[0027] In some embodiments, the sealing can includes a sleeve, a limiting portion and a protrusion, the protrusion is arranged on the outer wall of one end of the sleeve, the limiting portion is arranged at an end of the sleeve away from the protrusion, and the elastic member is sleeved on the outside of the sleeve and is located between the protrusion and the fixing seat.

[0028] The limiting portion is axially arranged along the opening of one end of the sleeve, and the limiting portion is inclined away from the end of the sleeve toward the direction close to the outer knife tube, and is spaced apart from the outer knife tube.

[0029] A method for using a biopsy needle, wherein the biopsy needle is a radiofrequency cutting biopsy needle as described in any one of the above, comprising the following steps:

[0030] The driving mechanism pushes the inner knife tube to move toward the distal end until the radio frequency cutting device is located at the sampling slot;

[0031] The outer knife tube enters the lesion tissue;

[0032] The driving mechanism drives the inner knife tube to move toward the proximal end until the air return assembly is in an initial position;

[0033] Starting the negative pressure device to absorb the lesion tissue into the sampling groove;

[0034] Starting the radio frequency cutting device;

[0035] The driving mechanism pushes the inner knife tube to move toward the distal end until the radio frequency cutting device is located at the sampling slot for adsorption sampling;

[0036] The outer knife tube is removed from the human body.

[0037] The radio frequency cutting biopsy needle and the method for using the biopsy needle provided by the present invention have the following beneficial effects:

[0038] 1. The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle. One end of the return air component is movably sleeved on the outside of the outer knife tube, and the other end of the return air component is sleeved on the proximal end of the inner knife tube, so that the return air component is sleeved on the proximal end of the outer knife tube and the outside of the inner knife tube. When the return air component is in the initial position, the return air component can play a sealing role so that the negative pressure generated by the negative pressure device is transmitted to the patient's lesion through the inner knife tube and the sampling slot, so that the sampling slot can fully absorb the tissue. Under the action of the driving mechanism, the return air component can start to move from the initial position, so that the air flow channel is connected with the external environment, so that the negative pressure of the negative pressure device is transmitted to the lesion, and the cut tissue is adsorbed and removed from the sampling slot. Therefore, the free switching of the sampling slot to adsorb and fix tissue and adsorb and remove tissue can be realized, thereby improving the use effect of the biopsy needle.

[0039] 2. The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle. When the air return component moves from the initial position toward the direction close to the outer knife tube, the ablation end of the radio frequency cutting device is already located in the sampling slot, so that the driving mechanism drives the inner knife tube to move while the air return component is still in the initial position. The negative pressure generated by the negative pressure device can firmly adsorb the tissue into the inner knife tube, making it easier for the subsequent air return component to adsorb the tissue into the inner knife tube after moving away from the initial position.

[0040] 3. The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle. The radio frequency cutting device includes an insulating blade head of an electrode, and a cable connected to the electrode is passed through a cable channel located in the side wall of the insulating blade head and the inner blade tube to ensure the safety of the patient during the operation.

[0041] 4. The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle, wherein the first part of the insulating blade head is fitted with a gap between the outer blade tube, which can reduce the possibility of tissue entering between the insulating blade head and the outer blade tube while ensuring that the insulating blade head moves relative to the outer blade tube.

[0042] 5. The present invention provides a radio frequency cutting biopsy needle and a method for using the biopsy needle. The radio frequency cutting device achieves cutting of the lesion tissue by energizing the electrode. The cutting method is changed from the original mechanical cutting to electric radio frequency cutting. Electric radio frequency cutting will not cause chipping, notching, or reduced sharpness. The practical cutting range is wider and the cutting efficiency is higher. In addition, the electrode can stop bleeding while cutting, reducing the possibility of bleeding during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present solution.

[0044] Figure 1 It is a structural schematic diagram of an embodiment of a radio frequency cutting biopsy needle provided by the present invention;

[0045] Figure 2 It is a schematic diagram of the internal structure of an embodiment of a radio frequency cutting biopsy needle provided by the present invention;

[0046] Figure 3 is a cross-sectional view of an embodiment of a radio frequency cutting biopsy needle provided by the present invention;

[0047] Figure 4 The invention provides a radio frequency cutting biopsy needle. Figure 3 A partial enlarged schematic diagram of

[0048] Figure 5It is a structural schematic diagram of an embodiment of an inner blade tube of a radio frequency cutting biopsy needle provided by the present invention;

[0049] Figure 6 It is a structural schematic diagram of an embodiment of an insulating blade head of a radio frequency cutting biopsy needle provided by the present invention;

[0050] Figure 7 It is a structural schematic diagram of another embodiment of a radio frequency cutting biopsy needle provided by the present invention;

[0051] Figure 8 It is a cross-sectional view of another embodiment of a radio frequency cutting biopsy needle provided by the present invention.

[0052] Description of Figure Numbers:

[0053] Outer knife tube 1, sampling slot 11, puncture knife 12, first sealing member 13, fixing seat 14, air flow channel 15, inner knife tube 2, first step portion 21, cable channel 22, return air assembly 3, sealing tank 31, sleeve 311, limiting portion 312, protrusion 313, elastic member 32, second sealing member 33, radio frequency cutting device 4, electrode 41, insulating knife head 42, first part 421, second part 422, second step portion 423, driving mechanism 5, motor 51, slider 52, outer sleeve 53, inner sleeve 54, transmission gear 55, shell 6, first shell 61, second shell 62, cover shell 63. DETAILED DESCRIPTION

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0055] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0056] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0058] In one embodiment, a radio frequency cutting biopsy needle is described, which drives the return air component 3 to move through the driving mechanism 5 to achieve the connection or disconnection of the air flow channel 15 with the external environment. When the air flow channel 15 is connected to the external environment, the negative pressure generated by the negative pressure device can enable the sampling slot 11 to fully absorb the lesion tissue and adsorb and fix it to the lesion tissue. When the air flow channel 15 is not connected to the external environment, the negative pressure generated by the negative pressure device can adsorb the cut tissue into the inner knife tube 2 and discharge it outward through the inner knife tube 2.

[0059] Specifically, see the attached drawings of the specification Figures 1 to 5 A radio frequency cutting biopsy needle comprises an outer blade tube 1, an inner blade tube 2, an air return assembly 3, a radio frequency cutting device 4 and a driving mechanism 5, wherein the ablation end of the radio frequency cutting device 4 is arranged at the distal end of the inner blade tube 2. It is set that when operating the cutting biopsy needle, the end of the biopsy needle away from the staff is the distal end, and the end close to the staff is the proximal end. The outer blade tube 1 is sleeved on the outer side of the distal end of the inner blade tube 2, and the proximal end of the inner blade tube 2 is located on the outer side of the outer blade tube 1, and an air flow channel 15 is arranged between the outer blade tube 1 and the inner blade tube 2, and the air flow channel 15 is connected to the sampling slot 11, so that the gas in the external environment can be connected to the sampling slot 11 through the air flow channel 15. Correspondingly, the proximal end of the inner knife tube 2 is configured to be connected to an external negative pressure device, so that the negative pressure generated by the negative pressure device is transmitted to the sampling slot 11 of the outer knife tube 1 through the inner knife tube 2. When the air flow channel 15 is not connected to the external environment, the negative pressure can only generate suction on the diseased tissue, and cannot drive the diseased tissue to move in the inner knife tube 2. When the air flow channel 15 is connected to the outside world, the negative pressure can not only generate suction on the diseased tissue, but also drive the diseased tissue to be discharged through the inner knife tube 2.

[0060] Correspondingly, one end of the air return component 3 is movably sleeved on the outside of the outer knife tube 1, and the other end of the air return component 3 is sleeved on the proximal end of the inner knife tube 2, so that the air return component 3 is covered on the part where the outer knife tube 1 and the inner knife tube 2 are in contact with the external environment. Correspondingly, the air return component 3 has an initial position relative to the outer knife tube 1, and when the air return component 3 moves relative to the outer knife tube 1, the positional relationship of the air return component 3 relative to the initial position can be adjusted. When the air return component 3 is in the initial position, the air return component 3 can block the airflow channel 15, so that the airflow channel 15 is not connected to the external environment. At this time, the suction force generated by the negative pressure device can fully adsorb the lesion tissue into the interior of the sampling slot 11, and can be adsorbed and fixed to the lesion tissue. Correspondingly, when the air return component 3 is located in the initial position, the driving mechanism 5 is started and can only drive the inner knife tube 2 to move a preset distance toward the distal end. The driving mechanism continues to operate and can drive the inner knife tube 2 and the air return component 3 to move, so that the air return component 3 is away from the initial position, and the air return component 3 will not isolate the air flow channel 15, so that the air flow channel 15 is connected with the external environment, and the air flow channel 15 is connected with the sampling slot 11. In addition to generating negative pressure, the negative pressure device can also drive the cut diseased tissue to be discharged through the inner knife tube 2.

[0061] In one embodiment, referring to the accompanying drawings, Figure 2 and Figure 3 This embodiment further describes a radio frequency biopsy needle. The radio frequency biopsy needle further includes a housing 6 and a puncture knife 12. The puncture knife 12 is arranged at the distal end of the outer knife tube 1. The housing 6 is arranged at an end of the outer knife tube 1 away from the puncture knife 12. The drive mechanism 5 is installed in the housing 6.

[0062] Furthermore, the distal end of the inner knife tube 2 and the air return assembly 3 are both installed in the shell 6, so that the radiofrequency biopsy needle is integrated, the structure is simpler and more compact, and no additional power handle is required, which reduces the difficulty of use. In addition, an air vent connected to the external environment is provided on the shell 6, so that the air flow channel 15 can be connected to the outside. Correspondingly, the driving mechanism 5 includes a motor 51 and a slider 52, wherein the slider 52 is arranged on the outside of the inner knife tube 2, and the output end of the motor 51 is connected to the slider 52 in a transmission manner. It can be understood that the motor 51 drives the slider 52 to move, and then drives the inner knife tube 2 to move. After the inner knife tube 2 moves a preset distance, that is, after the slider 52 moves a preset distance, the slider 52 contacts the air return assembly 3, driving the air return assembly 3 and the inner knife tube 2 to continue to move forward.

[0063] In actual production applications, the motor 51 can be set as a linear motor, and the slider 52 is fixedly connected to the output end of the linear motor, and the slider 52 is directly pushed to move by the linear motor. The motor 51 can also be set as a rotary motor, and the output end of the rotary motor is provided with an external thread, and the slider 52 is provided with a threaded hole matching the output end, and the slider 52 is driven to move by a screw drive. These are not described in detail here, and are all within the protection scope of the present invention.

[0064] In one embodiment, referring to the accompanying drawings, Figure 7 , Figure 8 This embodiment provides another specific structure of the housing 6. The housing 6 includes a first housing 61, a second housing 62 and a cover housing 63. The distal end of the inner knife tube 2 and the air return assembly 3 are both installed in the first housing 61, and the second housing 62 is arranged below the first housing 61. The cover housing 63 is arranged on the outer side of the first housing 61 and is connected and fixed to the second housing 62. Correspondingly, the driving mechanism 5 includes a motor 51, an outer sleeve 53 and an inner sleeve 54. The outer sleeve 53 and the inner sleeve 54 are both arranged in the first housing 61. The inner sleeve 54 is movably sleeved on the outer side of the inner knife tube 2 and is located on the side of the air return assembly 3 away from the puncture knife 12. The outer sleeve 53 is rotatably sleeved on the inner side of the inner sleeve 54. In addition, an outer thread is arranged on the outer side of the inner sleeve 54, and an inner thread matching the outer thread is arranged on the inner wall of the outer sleeve 53, so that when the outer sleeve 53 rotates, the inner sleeve 54 is driven to move along the extension direction of the inner knife tube 2.

[0065] Furthermore, a transmission gear 55 is provided on the outer sleeve 53, and the motor 51 is provided in the second housing 62 and is in transmission connection with the transmission gear 55, driving the transmission gear 55 to rotate and then driving the outer sleeve 53 to rotate, and then driving the inner sleeve 54 to move relative to the extension direction of the inner knife tube 2. In addition, the movement direction of the inner sleeve 54 can be controlled by controlling the rotation direction of the transmission gear 55, and correspondingly, a through hole connected to the outside is opened on the first housing 61, thereby realizing the forward or backward movement of the return air component 3, and then realizing the opening or closing of the air flow channel 15.

[0066] In one implementation, this embodiment further describes the air return assembly 3, wherein the air return assembly 3 includes a sealing tank 31, wherein a section of the sealing tank 31 is movably sleeved on the outside of the outer knife tube 1, and the other end of the sealing tank 31 is tightly connected to the proximal end of the inner knife tube 2. An airflow gap is set at the connection between the sealing tank 31 and the outer knife tube 1, and the airflow gap is connected to the external environment and is suitable for being connected to the inside of the sealing tank 31. Correspondingly, the airflow channel 15 is connected to the inside of the sealing tank 31, and the outer side of the outer knife tube 1 is sleeved with a first sealing member 13, and the first sealing member 13 is located in the sealing tank 31. When the sealing tank 31 is in the initial position, the first sealing member 13 is located at the airflow gap, and the inner wall of the sealing tank 31 abuts against the first sealing member 13, so that the first sealing member 13 is blocked at the airflow gap, thereby making the airflow channel 15 not connected to the external environment.

[0067] It can be understood that when the sealing can 31 is separated from the initial position, the sealing can 31 is separated from the first sealing member 13, so that the airflow gap is connected to the interior of the sealing can 31, and the airflow channel 15 is connected to the interior of the sealing can 31, thereby making the external environment and the airflow gap and the airflow channel 15 connected to each other, so that the negative pressure can adsorb the diseased tissue into the inner catheter.

[0068] Furthermore, a fixing seat 14 is provided on the outer knife tube 1, and the fixing seat 14 is located on the side of the sealing tank 31 close to the sampling slot 11, and the return air assembly 3 also includes an elastic member 32, and the elastic member 32 is located between the fixing seat 14 and the sealing tank 31, and is in a compressed state. The restoring force generated by the elastic member 32 in the compressed state can move the sealing tank 31 to an initial position in a direction away from the puncture knife 12, thereby causing the sealing tank 31 to contact and squeeze with the first sealing member 13, so that the air flow channel 15 is disconnected from the external environment.

[0069] Furthermore, the air return assembly 3 further includes a second seal 33, which is disposed at one end of the sealing tank 31 away from the fixed seat 14, so that the end of the sealing tank 31 away from the fixed seat 14 is tightly connected to the inner knife tube 2. It can be understood that, by disposing the second seal 33, the end of the sealing tank 31 away from the fixed seat 14 is tightly connected to the inner knife tube 2, and the sealing tank 31 moves under the action of the driving mechanism 5, so that the end of the sealing tank 31 close to the fixed seat 14 abuts against or separates from the first seal 13, thereby realizing the connection or disconnection of the airflow channel 15 with the external environment.

[0070] Correspondingly, the sealing tank 31 includes a sleeve 311, a limiting portion 312 and a protrusion 313, wherein the sleeve 311 is arranged at one end of the fixing seat 14 away from the puncture knife 12, and one end of the sleeve 311 is sleeved on the outer side of the proximal end of the outer knife tube 1. The protrusion 313 is arranged on the outer side wall of one end of the sleeve 311, and the limiting portion 312 is arranged at one end of the sleeve 311 away from the protrusion 313. When the sealing tank 31 is sleeved on the outer side of the outer knife tube 1, the end of the sealing tank 31 provided with the limiting portion 312 is sleeved on the outer side of the proximal end of the outer knife tube 1, and the end of the sealing tank 31 provided with the protrusion 313 is sleeved on the outer side of the inner knife tube 2. The second sealing member 33 is arranged at one end of the sleeve 311 away from the fixing seat 14, and is fixedly connected to the inner wall of the sleeve 311. Correspondingly, the second sealing member 33 is annularly sleeved on the outer side of the inner knife tube 2 , and the inner ring of the second sealing member 33 is slidably connected to the inner knife tube 2 , so that the second sealing member 33 and the inner knife tube 2 are tightly connected.

[0071] In one embodiment, referring to the accompanying drawings, Figures 2 to 6 , this embodiment further illustrates the radio frequency cutting device 4. The radio frequency cutting device 4 includes an electrode 41 and an insulating blade head 42. The electrode 41 is arranged at one end of the insulating blade head 42. The end of the insulating blade head 42 away from the electrode 41 is connected to the distal end of the inner blade tube 2 to form the ablation end of the radio frequency cutting device 4. In addition, the insulating blade head 42 is cylindrical, and the electrode 41 is connected to the radio frequency generating device in the external environment to energize the electrode 41 and then cut the tissue located in the sampling slot 11. Accordingly, a plurality of through holes are provided on the side wall of the insulating blade head 42, so that the airflow channel 15 can be connected to the interior of the insulating blade head 42 through the through holes, and then connected to the sampling slot 11.

[0072] It should be pointed out that the RF cutting device 4 has a wider cutting range and better cutting efficiency, and avoids the occurrence of blade breakage and notches in the traditional cutting method, and the electrode 41 can stop bleeding of the lesion tissue during the cutting process, effectively reducing and lowering the probability of bleeding and reducing surgical risks. In addition, when the return air component is in the initial position, the insulating blade head 42 and the electrode 41 are both located in the inner blade tube 2 and on the side of the sampling slot 11 away from the puncture knife 12.

[0073] Preferably, the insulating blade head 42 is made of ceramic material, and the material of the electrode 41 is tungsten-rhenium alloy. In addition, preferably, the outer sides of the inner blade tube 2, the outer blade tube 1, the electrode 41 and the puncture blade 12 are all coated with an insulating layer.

[0074] The insulating blade head 42 includes a first part 421 and a second part 422 connected in sequence, and an end of the second part 422 away from the first part 411 is connected to the inner blade tube 2;

[0075] The outer diameter of the first part 421 is larger than the outer diameter of the second part 422, and is in clearance with the outer blade tube 1. The first part 421 is in clearance with the inner blade tube 2, so that the end of the insulating blade head 42 away from the inner blade tube 2 is closely matched, so as to reduce the possibility of the cut debris tissue entering between the insulating blade head 42 and the inner blade tube 2, and ensure the stability and reliability of the biopsy needle during operation.

[0076] Furthermore, a mounting groove matching the electrode 41 is provided on the side of the insulating blade head 42 away from the inner blade tube 2 so that the electrode 41 can be installed in the mounting groove, and a cable channel 22 is provided in both the insulating blade head 42 and the inner blade tube 2 for connecting the electrode 41 to the radio frequency generating device through a wire.

[0077] A first step portion 21 is provided at the inner wall of the distal end of the inner blade tube 2, and a second step portion 423 matching the first step portion 21 is provided at the outer wall of the proximal end of the insulating blade head 42, so as to install the insulating blade head 42 at the distal end of the inner blade tube 2. Accordingly, the cable channel 22 of the insulating blade head 42 is arranged through the side wall of the insulating blade head 42, and the cable channel 22 of the inner blade tube 2 is arranged through the side wall of the inner blade tube 2.

[0078] By providing a cable channel for placing the wires in the insulating blade head 42 and the inner blade tube 2, the wires can be protected and the possibility of wear and damage to the wires during use can be reduced.

[0079] In addition, as a preference, the present embodiment further describes a radio frequency cutting biopsy needle, wherein when the air return component 3 moves from the initial position toward the direction close to the outer knife tube 1, the ablation end of the radio frequency cutting device 4 is already located in the sampling slot 11, that is, when the driving mechanism 5 only pushes the inner knife tube 2 to move a distance less than a preset distance, the ablation end has already extended into the sampling slot 11 of the outer knife tube 1. It can be understood that when the sealing can 31 is located in the initial position, the negative pressure device is started to absorb the diseased tissue in the sampling slot 11 through negative pressure. The driving mechanism 5 first only drives the inner knife tube 2 to move. As the inner knife tube 2 moves, the distance between the inner knife tube 2 and the sampling slot 11 gradually decreases, so that the ablation end is located at the sampling slot 11, so that the diseased tissue is firmly absorbed in the distal end of the inner knife tube 2. At this time, the return air component 3 is still in the initial position and is not driven by the driving mechanism 5. When the inner knife tube 2 continues to move, causing the return air component 3 to leave the initial position, the air flow channel 15 is connected to the external environment, so that the negative pressure gradually sucks out the diseased tissue.

[0080] In one embodiment, this embodiment provides a method for using a biopsy needle, where the biopsy needle is a radiofrequency cutting biopsy needle provided in any of the above embodiments, comprising the following steps:

[0081] The driving mechanism pushes the inner knife tube to move toward the distal end until the radio frequency cutting device is located at the sampling slot;

[0082] The outer knife tube enters the lesion tissue;

[0083] The driving mechanism drives the inner knife tube to move toward the proximal end until the air return assembly is in an initial position;

[0084] Starting the negative pressure device to absorb the lesion tissue into the sampling groove;

[0085] Starting the radio frequency cutting device;

[0086] The driving mechanism pushes the inner knife tube to move toward the distal end until the radio frequency cutting device is located at the sampling slot for adsorption sampling;

[0087] The outer knife tube is removed from the human body.

[0088] Specifically, first, the driving mechanism 5 is used to push the inner knife tube 2 toward the distal end, so that the radio frequency cutting device 4 (insulating knife head 42 and electrode 41) is located at the sampling slot 11 and completely overlaps with the sampling slot 11, and then the outer knife tube 1 is inserted into the lesion tissue and punctured into the patient's body through the puncture knife 12. By locating the radio frequency cutting device 4 at the sampling slot 11, the pain of inserting the puncture knife 12 and the outer knife tube 1 into the patient's body can be reduced. After the outer knife tube 1 and the puncture knife 12 are inserted into the lesion tissue, the driving mechanism 5 drives the inner knife tube 2 to move toward the distal end until the return air component 3 moves to the initial position, so that the airflow channel 15 is not connected to the external environment. At this time, the negative pressure device is started to generate negative pressure, and the negative pressure is directly transmitted to the sampling slot 11 of the outer knife tube 1 through the inner knife tube 2, which can fully adsorb the lesion tissue into the sampling slot 11, and the connection strength between the outer knife tube 1 and the lesion tissue is high. When the sampling slot 11 is in place, the radio frequency cutting device 4 is started, that is, the electrode 41 is electrically connected to the radio frequency generating device, so that the electrode 41 is energized. After the electrode 41 is energized, the driving mechanism 5 pushes the inner knife tube 2 to move toward the distal end in the outer knife tube 1, and the inner knife tube 2 moves toward the direction close to the sampling slot 11. After the inner knife tube 2 moves a distance, the driving mechanism 5 drives the inner knife tube 2 and the return air component 3 to move, so that the return air component 3 is away from the initial position. At this time, the air flow channel 15 is connected to the external environment, so that the negative pressure generated by the negative pressure device is connected to the external environment. With the continuous movement of the inner knife tube 2, the radio frequency cutting device 4 is located at the sampling slot 11 for adsorption sampling, that is, the electrode 41 continuously cuts the lesion tissue, and the cut lesion tissue is discharged outward through the inner knife tube 2 under the action of the negative pressure device. After the sampling is completed, the outer knife tube 1 and the puncture knife 12 are taken out from the lesion tissue of the human body.

[0089] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A radiofrequency cutting biopsy needle, characterized in that: It comprises an outer knife tube, an inner knife tube, an air return assembly, a radio frequency cutting device and a driving mechanism, wherein a sampling groove is provided on the side wall of the outer knife tube, and the ablation end of the radio frequency cutting device is arranged at the distal end of the inner knife tube; The distal end of the inner knife tube is inserted into the outer knife tube, an air flow channel connected to the sampling slot is provided between the inner knife tube and the outer knife tube, so that the inner knife tube can move linearly relative to the outer knife tube, and the proximal end of the inner knife tube is configured to be connected to a negative pressure device; One end of the air return assembly is movably sleeved on the outer side of the outer knife tube, and the other end of the air return assembly is sleeved on the proximal end of the inner knife tube, and the driving mechanism is drivingly connected to the inner knife tube; The air return assembly has an initial position relative to the outer knife tube. When the air return assembly is in the initial position, the air flow channel is not connected to the external environment. After the driving mechanism drives the inner knife tube to move a preset distance to the far end, the driving mechanism drives the inner knife tube and the air return assembly to move, so that the air return assembly is away from the initial position, thereby making the air flow channel connected to the external environment. The air return assembly includes a sealing tank, one end of which is movably sleeved on the outside of the outer knife tube, the other end of which is sealed and connected to the proximal end of the inner knife tube, and an air flow gap connected to the external environment is provided at the connection between the sealing tank and the outer knife tube, the air flow channel is connected to the interior of the sealing tank, a fixing seat is provided on the outer knife tube, and is located on a side of the sealing tank close to the sampling slot, the air return assembly also includes an elastic member provided between the fixing seat and the sealing tank, and the elastic member is in a compressed state so that the sealing tank is in an initial position; A first seal is provided on the outer side of the outer knife tube, and the first seal is located in the sealing tank. When the sealing tank is in the initial position, the first seal is located in the airflow gap so that the airflow channel is not connected to the external environment. When the return air component moves from the initial position toward the direction close to the outer knife tube, the ablation end of the radio frequency cutting device is located in the sampling slot.

2. The radiofrequency cutting biopsy needle according to claim 1, characterized in that: The air return assembly further comprises a second seal, which is located at one end of the sealing tank away from the fixing seat, so that the end of the sealing tank away from the fixing seat is tightly connected to the inner knife tube.

3. The radiofrequency cutting biopsy needle according to claim 2, characterized in that: The radio frequency cutting device comprises an electrode and an insulating blade head arranged at the distal end of the inner blade tube, the insulating blade head is cylindrical and communicated with the inner blade tube, the electrode is arranged at one end of the insulating blade head away from the inner blade tube to form the ablation end, and the electrode is connected to the radio frequency generating device; A plurality of through holes are provided on the side wall of the insulating blade head, so that the air flow channel can be connected with the sampling slot through the through holes.

4. The radiofrequency cutting biopsy needle according to claim 3, characterized in that: The insulating blade head comprises a first part and a second part connected in sequence, wherein an end of the second part away from the first part is connected to the inner blade tube; The outer diameter of the first part is greater than the outer diameter of the second part, and the first part is loosely matched with the outer knife tube.

5. The radiofrequency cutting biopsy needle according to claim 4, characterized in that: A mounting groove matched with the electrode is provided on one side of the insulating blade head away from the inner blade tube, so that the electrode can be mounted in the mounting groove; The insulating blade head and the inner blade tube are both provided with cable channels for connecting the electrode to a radio frequency generating device through a wire.

6. The radio frequency cutting biopsy needle according to claim 5, characterized in that: A first step portion is provided at the inner wall of the distal end of the inner blade tube, and a second step portion matching the first step portion is provided at the outer wall of the proximal end of the insulating blade head, so as to install the insulating blade head at the distal end of the inner blade tube; The cable channel of the insulating cutter head is arranged through the side wall of the insulating cutter head, and the cable channel of the inner cutter tube is arranged through the side wall of the inner cutter tube.

7. The radio frequency cutting biopsy needle according to claim 6, characterized in that: It also includes a shell and a puncture knife, wherein the puncture knife is fixedly connected to the distal end of the outer knife tube, the shell is arranged at an end of the outer knife tube away from the puncture knife, and the driving mechanism is installed in the shell.

8. The radio frequency cutting biopsy needle according to claim 7, characterized in that: The distal end of the inner knife tube and the air return assembly are both installed in the shell, and the shell is provided with an air hole connected to the external environment; The driving mechanism comprises a motor and a slider, wherein the slider is arranged on the outside of the inner knife tube, and the output end of the motor is transmission-connected with the slider to drive the slider and the inner knife tube to move.

9. The radio frequency cutting biopsy needle according to claim 2, characterized in that: The sealing can comprises a sleeve, a limiting portion and a protruding portion, wherein the protruding portion is arranged on the outer wall of one end of the sleeve, the limiting portion is arranged at an end of the sleeve away from the protruding portion, and the elastic member is sleeved on the outer side of the sleeve and located between the protruding portion and the fixing seat; The limiting portion is axially arranged along the opening of one end of the sleeve, and the limiting portion is inclined away from the end of the sleeve toward the direction close to the outer knife tube, and is spaced apart from the outer knife tube.

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