Electrosurgical instrument

Abstract

An electrosurgical instrument comprises an operating rod and a handle assembly, the operating rod comprises an insulating tube, a metal tube and an electrode, the metal tube is arranged in the insulating tube, the electrode is mounted on the metal tube, and the electrode can be extended out of the insulating tube to perform electrocoagulation or electrocision on patient tissue. The handle assembly is connected with the operating rod, and the handle assembly comprises a shell, an exhaust pipeline, a first valve, a cable, a switch and a first operation key. One end of the exhaust pipeline is arranged in the shell and communicates with the metal tube, and the other end of the exhaust pipeline is used for being connected with a negative pressure device. The exhaust pipeline is used for sucking smoke generated at least when the electrode performs electrocoagulation or electrocision through the metal tube. The first valve is connected with the exhaust pipeline to control the opening and closing of the exhaust pipeline. One end of the cable is arranged in the shell and is electrically connected with the electrode, and the cable is used for supplying power to the electrode. The switch is connected with the cable to control the opening and closing of the cable. The first operation key is mounted on the first valve, and the first operation key is driven by external force to open the first valve and trigger the switch.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to an electrosurgical instrument. Background Technology

[0002] During laparoscopic surgery, the use of high-frequency surgical instruments to electrocauterize or coagulate patient tissues generates a large amount of smoke that permeates the abdominal cavity and affects the surgeon's field of vision. Summary of the Invention

[0003] In view of this, the present invention proposes an electrosurgical instrument.

[0004] The electrosurgical instrument according to the first aspect of the present invention comprises: An operating rod includes an insulating tube, a metal tube, and an electrode. The metal tube is disposed inside the insulating tube, and the electrode is installed in the metal tube. The electrode can extend out of the insulating tube to perform electrocoagulation or electroresection on the diseased tissue. A handle assembly, connected to the operating lever, includes a housing, a smoke exhaust pipe, a first valve, a cable, a switch, and a first operating key. One end of the smoke exhaust pipe is located inside the housing and communicates with the metal pipe, while the other end is connected to a negative pressure device. The smoke exhaust pipe is used to at least draw in the smoke generated during electrocoagulation or electrocutting of the electrode through the metal pipe. The first valve is connected to the smoke exhaust pipe to control its on / off state. One end of the cable is located inside the housing and electrically connected to the electrode, providing power to the electrode. The switch is connected to the cable to control its on / off state. The first operating key is mounted on the first valve. When the first operating key is driven by an external force, it opens the first valve and triggers the switch.

[0005] As can be seen from the above technical solutions, the electrosurgical instrument proposed in this invention, by integrating a smoke extraction tube into the handle to draw away the smoke generated during electrocoagulation or electroresection, can prevent smoke from spreading around the lesion and affecting the surgical field of vision. Secondly, the smoke extraction tube draws away the smoke through a metal tube, which is close to the electrode and can remove the smoke in a timely manner, thus significantly improving the surgeon's surgical field of vision. Furthermore, the cleaning tube is installed in the handle assembly and draws away the smoke through the metal tube, thus eliminating the need for an additional puncture channel on the patient's body for smoke extraction, reducing patient discomfort. Moreover, when the first operation button is driven by external force, it opens the first valve and triggers the switch, meaning that electrocoagulation / electroresection and smoke extraction operations are initiated simultaneously through the first operation button. The structure is compact and the operation is simple, allowing the surgeon to perform electrocoagulation / electroresection and smoke extraction operations by a single person without the need for additional assistants. In addition, the smoke extraction tube is connected to a negative pressure device, and the smoke drawn by the smoke extraction tube is collected in the negative pressure device, preventing the smoke from spreading into the operating room and affecting the surgeon's health. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the structure of the electrosurgical instrument proposed in the embodiments of the present invention; Figure 2 This is a schematic diagram of the operating lever structure proposed in an embodiment of the present invention; Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the switch structure proposed in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the handle assembly proposed in an embodiment of the present invention; Figure 6 This is a schematic diagram showing the cooperation of the first valve, the first operating element, the reset assembly, and the damping assembly proposed in an embodiment of the present invention; Figure 7 This is a partial structural schematic diagram of the handle assembly proposed in an embodiment of the present invention; Figure 8 This is a partial structural diagram of the handle assembly from the back view according to an embodiment of the present invention. Detailed Implementation

[0008] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0009] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0010] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0011] like Figures 1 to 5 As shown, an embodiment of the present invention provides an electrosurgical instrument 100, which includes an operating rod 10 and a handle assembly 20. The operating rod 10 includes an insulating tube 11, a metal tube 12, and an electrode 13. The metal tube 12 is disposed inside the insulating tube 11, and the electrode 13 is installed in the metal tube 12. The electrode 13 can extend outside the insulating tube 11 to perform electrocoagulation or electroresection on the patient tissue. The handle assembly 20 is connected to the operating rod 10 and includes a housing 21, a smoke exhaust pipe 22, a first valve 23, a cable 24, a switch 25, and a first operating key 26. One end of the smoke exhaust pipe 22 is disposed inside the housing 21 and communicates with the metal tube 12. The other end of the smoke exhaust pipe 22 is used to connect to a negative pressure device. The smoke exhaust pipe 22 is used to at least draw out the smoke generated during electrocoagulation or electroresection by the electrode 13 through the metal tube 12. The first valve 23 is connected to the smoke exhaust pipe 22 to control the opening and closing of the smoke exhaust pipe 22. One end of cable 24 is located inside housing 21 and electrically connected to electrode 13. Cable 24 is used to supply power to electrode 13. Switch 25 is connected to cable 24 to control the on / off state of cable 24. First operation key 26 is installed on first valve 23. When first operation key 26 is driven by external force, first valve 23 is opened and switch 25 is triggered. Optionally, cable 24 is electrically connected to electrode 13 through metal tube 12.

[0012] The electrosurgical instrument 100 proposed in this embodiment of the invention can prevent smoke generated during electrocoagulation or electroresection by integrating a smoke extraction tube 22 in the handle, thus avoiding smoke from spreading around the lesion and affecting the surgical field of vision. Secondly, the smoke extraction tube 22 extracts smoke through a metal tube 12, which is close to the electrode 13 and can remove smoke in time, significantly improving the surgeon's surgical field of vision. Furthermore, the cleaning tube is installed in the handle assembly 20 and extracts smoke through the metal tube 12, so there is no need to add a puncture channel to the patient's body for smoke extraction, reducing patient discomfort. Moreover, when the first operation key 26 is driven by external force, it opens the first valve 23 and triggers the switch 25, that is, the electrocoagulation / electroresection and smoke extraction operations are started simultaneously through the first operation key 26. The structure is compact and the operation is simple. The surgeon can perform electrocoagulation / electroresection and smoke extraction operations by himself without the need for additional assistants. In addition, the smoke exhaust pipe 22 is connected to the negative pressure device. The smoke drawn by the smoke exhaust pipe 22 is collected in the negative pressure device, which can prevent the smoke from spreading into the operating room and affecting the health of the doctors.

[0013] In some embodiments, the operating lever 10 is detachably connected to the handle assembly 20. This embodiment facilitates switching not only between operating levers 10 with different functions, such as electrocoagulation and electrosurgical cutting, but also between operating levers 10 with the same function but different electrode 13 shapes. For example, the electrodes 13 of the electrocoagulation operating lever 10 may be hook-shaped, shovel-shaped, or spherical, allowing for the replacement of the electrocoagulation operating lever 10 with the desired electrode 13 shape according to actual usage needs. Optionally, the operating lever 10 and the handle assembly 20 are snap-fit ​​connected.

[0014] like Figure 2 and Figure 3 As shown, in some embodiments, the operating lever 10 further includes a rotating wheel 14. The end of the insulating tube 11 away from the electrode 13 is connected to the rotating wheel 14. When the operating lever 10 is mounted on the handle assembly 20, the rotating wheel 14 is movable relative to the handle assembly 20 in the axial direction of the insulating tube 11. When electrocoagulation or electrocautery is required, the rotating wheel 14 can be moved toward the handle assembly 20, and the rotating wheel 14 drives the insulating tube 11 to move toward the handle assembly 20. The electrode 13 extends out of the insulating tube 11, thereby enabling electrocoagulation or electrocautery operations. When other operations are required, such as using the metal tube 12 to aspirate tissue fluid flowing out when the electrode 13 electrocautersts the patient tissue or to aspirate waste fluid formed when rinsing the patient tissue, the rotating wheel 14 can be moved away from the handle assembly 20. The rotating wheel 14 drives the insulating tube 11 to move away from the handle assembly 20, and the electrode 13 retracts into the insulating tube 11, thereby enabling the aspiration of tissue fluid and waste fluid.

[0015] In some embodiments, the travel of the first operation key 26 includes a first position, a second position, and a third position, with the second position located between the first and third positions. In the first position, the first valve 23 is closed. When the first operation key 26 reaches the second position, the first valve 23 is opened. When the first operation key 26 reaches the third position, the switch 25 is triggered. In this embodiment, the first operation key 26 passes through the second position to open the valve before reaching the third position to trigger the switch 25. That is, before the electrode 13 is energized for electrocoagulation or electroresection, the smoke exhaust is opened first. Thus, the smoke generated by the electrode 13 during electrocoagulation or electroresection is promptly extracted by the smoke exhaust pipe 22, preventing it from spreading around the lesion and affecting the surgical field of view.

[0016] Of course, it is not limited to setting the exhaust to be turned on before electrocoagulation or electrocutting. For example, in some other embodiments, the stroke of the first operation key 26 includes a first position and a second position. When the first position is in the first position, the first valve 23 is in the closed state. When the first operation key 26 moves to the second position, the first valve 23 is opened and the switch 25 is triggered at the same time. That is, the exhaust is turned on at the same time as electrocoagulation or electrocutting. In this embodiment, the smoke generated by the electrode 13 during electrocoagulation or electrocutting can also be discharged in time.

[0017] like Figure 1 , Figure 5 and Figure 6 As shown, in some embodiments, the first valve 23 includes a valve body 231 and a valve core 232 movably mounted inside the valve body 231. The first operating key 26 is movably mounted on the valve body 231 and connected to the valve core 232. The electrosurgical instrument 100 also includes a reset assembly 30 and a damping assembly 40. The reset assembly 30 is installed between the valve body 231 and the first operating key 26, or between the housing 21 and the first operating key 26. The reset assembly 30 provides a restoring force so that when the external force pressing the first operating key 26 is removed, it drives the first operating key 26 to reset. During the reset process, the switch 25 is disconnected, and the valve core 232 is driven back to its initial position to close the valve. The damping assembly 40 is installed between the valve body 231 and the valve core 232, or between the valve body 231 and the first operating key 26, or between the first operating key 26 and the housing 21. The damping assembly 40 provides a damping force so that the first operating key 26 is delayed in resetting to its initial position after the switch 25 is disconnected. In this embodiment, by setting the damping component 40 to delay the first operation key 26 from resetting to its initial position after the first operation key 26 is turned off by the switch 25, the smoke exhaust pipe 22 can continue to exhaust for a short period of time when the electrode 13 stops electrocoagulation or electrocautery, thereby cleaning up the smoke around the lesion.

[0018] Optionally, the first operation key 26 is a button, and the reset component 30 is a spring. The spring is installed between the valve body 231 and the first operation key 26, with one end of the spring abutting against the valve body 231 and the other end abutting against the first operation key 26. When the operator presses the first operation key 26, the spring is compressed. When the external force of the operator pressing the first operation key 26 is removed, the spring drives the button to reset to its initial position through its elastic force. When the spring is installed between the housing 21 and the first operation key 26, one end of the spring abuts against the housing 21, and the other end abuts against the first operation key 26.

[0019] It should be noted that the first operation key 26 is not limited to a button; it can also be a knob. The operator turns the first operation key 26 to open the first valve 23 and trigger the switch 25. When the first operation key 26 is a knob, the reset component 30 can be a torsion spring or a flat spiral spring installed between the valve body 231 and the first operation key 26, or between the housing 21 and the first operation key 26. The knob is reset to its initial position by the torque of the torsion spring or the restoring force of the flat spiral spring.

[0020] In some embodiments, the damping assembly 40 includes a friction element 41 disposed between the valve body 231 and the valve core 232, the friction element 41 being mounted on one of the valve body 231 and the valve core 232, and the friction element 41 providing damping force by rubbing against the other of the valve body 231 and the valve core 232.

[0021] In some embodiments, the friction element 41 is a sealing ring mounted on the inner wall of the valve body 231 or on the outer wall of the valve core 232. In this embodiment, the friction element 41 can be used both to provide damping force and to seal between the valve body 231 and the valve core 232, simplifying the structure.

[0022] In some embodiments, the first operation key 26 includes an electrocautery button 261 and an electrocoagulation button 262, and the switch 25 includes an electrocautery contact 251 and an electrocoagulation contact 252. The electrocautery button 261 is activated when pressed by an external force, and the electrocoagulation button 262 is activated when pressed by an external force. In this embodiment, the electrocautery button 261 and the electrocoagulation button 262 are integrated on the handle. By changing the operating lever 10, the electrosurgical instrument 100 can be switched between electrocoagulation and electrocautery functions. Of course, the first operation key 26 may also include only one of the electrocautery button 261 and the electrocoagulation button 262; correspondingly, the switch 25 may include only one of the electrocautery contact 251 and the electrocoagulation contact 252, depending on the actual design requirements.

[0023] like Figure 6As shown, in some embodiments, the first valve 23 includes a valve body 231, a first valve core 2321, and a second valve core 2322. The valve body 231 includes a main body 2311, a first cylindrical body 2312, and a second cylindrical body 2313. The main body 2311 includes an inner cavity 2314 and a first interface 2315 communicating with the inner cavity 2314. The first interface 2315 is connected to a negative pressure device through a pipe. The first cylindrical body 2312 is installed on the side wall of the main body 2311 and communicates with the inner cavity 2314. The first valve core 2321 is movably installed inside the first cylindrical body 2312. The electric cut-off button 261 is movably installed in the first cylindrical body 2312 and connected to the first valve core 2321. The side wall of the first cylindrical body 2312 is provided with a second interface 2316 communicating with the first cylindrical body 2312. The second interface 2316 is connected to the metal pipe 12 through a pipe. The second cylinder 2313 is installed on the side wall of the main body 2311 and communicates with the inner cavity 2314. The second valve core 2322 is movably installed in the second cylinder 2313. The electrocoagulation button 262 is movably installed in the second cylinder 2313 and connected to the second valve core 2322. The second cylinder 2313 communicates with the first cylinder 2312.

[0024] When the operator presses the electric cutting button 261, the electric cutting button 261 drives the end of the first valve core 2321 away from the electric cutting button 261 to move into the inner cavity 2314 of the valve body 231. At this time, the inner cavity 2314 is connected to the first cylinder 2312. The smoke generated when the electrode 13 performs electric cutting enters the metal tube 12 under the suction force of the negative pressure device, and enters the inner cavity 2314 of the valve body 231 through the first cylinder 2312 from the second interface 2316, and then flows to the negative pressure device from the first interface 2315. When the operator presses the electrocoagulation button 262, the electrocoagulation button 262 drives the end of the second valve core 2322 away from the electrocoagulation button 262 to move into the inner cavity 2314 of the valve body 231. At this time, the inner cavity 2314 is connected to the second cylinder 2313. The smoke generated when the electrode 13 performs electrocoagulation enters the metal tube 12 under the suction force of the negative pressure device, and enters the second cylinder 2313 through the first cylinder 2312 from the second interface 2316. Then it diffuses into the inner cavity 2314 of the valve body 231, and finally flows to the negative pressure device from the first interface 2315.

[0025] In this embodiment, the first valve 23 integrates the electrocoagulation structure, the electrocutting structure, the electrocoagulation smoke exhaust structure, and the electrocutting smoke exhaust structure into one compact structure, reducing the complexity of the instrument. At the same time, the electrocoagulation structure, the electrocutting structure, the electrocoagulation smoke exhaust structure, and the electrocutting smoke exhaust structure occupy little space, which is beneficial to the structural design of the handle assembly 20.

[0026] Of course, the first valve 23 is not limited to the above-described configuration. For example, in some other embodiments, the second cylinder 2313 is not connected to the first cylinder 2312, and the side wall of the second cylinder 2313 is provided with a fourth interface, which is connected to the metal pipe 12 through a pipe.

[0027] As described above, the first operation key 26 may include only one of the electric cut-off key 261 and the electric coagulation key 262. Correspondingly, the switch 25 may include only one of the electric cut-off contact 251 and the electric coagulation contact 252. When the first operation key 26 may include only one of the electric cut-off key 261 and the electric coagulation key 262, the first valve 23 includes a valve body 231 and a valve core 232. The valve body 231 includes a main body 2311 and a cylinder. The main body 2311 includes an inner cavity 2314 and a first interface 2315 communicating with the inner cavity 2314. The first interface 2315 is connected to the negative pressure device through a pipe. The cylinder is installed on the side wall of the main body 2311 and communicates with the inner cavity 2314. The valve core 232 is movably installed in the cylinder. The first operation key 26 is movably installed in the cylinder and connected to the valve core 232. The side wall of the cylinder is provided with a second interface 2316 communicating with the cylinder. The second interface 2316 is connected to the metal pipe 12 through a pipe.

[0028] like Figure 1 , Figure 5 and Figure 7 As shown, in some embodiments, the electrosurgical instrument 100 further includes a cleaning tube 51, a second valve 52, and a second operating key 53. One end of the cleaning tube 51 is installed inside the housing 21 and communicates with the metal tube 12, while the other end is connected to a cleaning fluid supply device. The cleaning tube 51 is used to deliver cleaning fluid into the metal tube 12 to rinse the patient tissue. The second valve 52 is installed on the cleaning tube 51 to control its opening and closing. The second operating key 53 is installed on the second valve 52, and opens the second valve 52 when driven by external force. In this embodiment, by integrating the cleaning tube 51 onto the handle, an additional cleaning device is not required to clean the patient tissue, saving costs. The structure and connection relationship of the second valve 52 can refer to the above embodiments and will not be repeated here. The second operating key 53 can be a button or a knob, and its implementation can also refer to the above embodiments and will not be repeated here.

[0029] like Figure 1 , Figure 5 , Figure 7 and Figure 8As shown, in some embodiments, the electrosurgical instrument 100 further includes a drainage pipe 61, a third valve 62, and a third operation key 63. One end of the drainage pipe 61 is connected to the metal tube 12, and the other end is connected to a negative pressure device. The drainage pipe 61 is used to aspirate waste fluid generated after rinsing the patient's tissue. The third valve 62 is installed on the drainage pipe 61 to control the opening and closing of the drainage pipe 61. The third operation key 63 is installed on the third valve 62, and opens the third valve 62 when the third operation key 63 is driven by external force. In this embodiment, by integrating the drainage pipe 61 on the handle, it is not necessary to add an additional drainage device to aspirate the waste fluid generated after rinsing the patient's tissue, thus saving costs. The structure and connection relationship of the third valve 62 can refer to the above embodiments and will not be described in detail here. The third operation key 63 can be a button or a knob, and its implementation can also refer to the above embodiments and will not be described in detail here.

[0030] like Figure 6 and Figure 7 As shown, in some embodiments, the first valve 23 includes an inner cavity 2314, a first interface 2315, a second interface 2316, and a third interface 2317. All three interfaces are connected to the inner cavity 2314. The smoke exhaust pipe 22 includes a first pipe section 221 and a second pipe section 222. The first pipe section 221 connects to the negative pressure device and the first interface 2315, and the second pipe section 222 connects to the second interface 2316 and the metal pipe 12. The first valve 23 controls the connection between the second interface 2316 and the inner cavity 2314. The drain pipe 61 connects to the metal pipe 12 and the third interface 2317, allowing the drain pipe 61 and the smoke exhaust pipe 22 to share the second pipe section 222 and the negative pressure device. This embodiment integrates the smoke exhaust pipe 22 and the drain pipe 61 during surgery, reducing the need for one pipe, simplifying operation, and making it more convenient for doctors.

[0031] It should be noted that in some other embodiments, the drain pipe 61 can also be connected to the negative pressure device through another separate pipe, that is, the drain pipe 61 does not share the second pipe section 222 with the smoke exhaust pipe 22.

[0032] like Figure 1 and Figure 8As shown, in some embodiments, the first operation key 26, the second operation key 53, and the third operation key 63 are all buttons. The housing 21 includes a handle belly 211 and a handle back 212 opposite to the handle belly 211. The first operation key 26 is located on the handle belly 211, and the second operation key 53 and the third operation key 63 are arranged side by side on the handle back 212 near the first end of the handle. The operating lever 10 is connected to the first end of the handle. In this embodiment, when the operator holds the handle, the first operation key 26 is opposite to the four fingers of the human hand, and the second operation key 53 and the third operation key 63 are opposite to the thumb of the human hand, which conforms to ergonomics and makes it convenient for the operator to press the first operation key 26, the second operation key 53, and the third operation key 63.

[0033] In some embodiments, the orifice diameter of the cleaning conduit 51 is smaller than that of the drain conduit 61. By setting the cleaning conduit 51 to have a smaller orifice diameter, a higher pressure is achieved when flushing the patient's tissue, which is beneficial for removing eschar remaining after electrocoagulation and electrocautery procedures. The drain conduit 61 has a larger orifice diameter because a larger flow rate is required for wastewater discharge.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An electrosurgical instrument, characterized in that, include: An operating rod includes an insulating tube, a metal tube, and an electrode. The metal tube is disposed inside the insulating tube, and the electrode is installed in the metal tube. The electrode can extend out of the insulating tube to perform electrocoagulation or electroresection on the diseased tissue. A handle assembly, connected to the operating lever, includes a housing, a smoke exhaust pipe, a first valve, a cable, a switch, and a first operating key. One end of the smoke exhaust pipe is located inside the housing and communicates with the metal tube. The other end of the smoke exhaust pipe is used to connect to a negative pressure device. The smoke exhaust pipe is used to at least draw in the smoke generated during electrocoagulation or electrocutting of the electrode through the metal tube. The first valve is connected to the smoke exhaust pipe to control its on / off state. One end of the cable is located inside the housing and electrically connected to the electrode. The cable is used to supply power to the electrode. The switch is connected to the cable to control its on / off state. The first operation key is installed on the first valve. When the first operation key is driven by an external force, it opens the first valve and triggers the switch. The first valve includes a valve body and a valve core movably mounted inside the valve body. The first operating key is movably mounted on the valve body and connected to the valve core. The electrosurgical instrument further includes: A reset assembly is installed between the valve body and the first operating key or between the housing and the first operating key. The reset assembly is used to provide a restoring force so that when the external force pressing the first operating key is removed, it drives the first operating key to reset. During the reset process of the first operating key, the switch is disconnected and the valve core is driven back to the initial position to close the valve. A damping assembly is installed between the valve body and the valve core, or between the valve body and the first operating key, or between the first operating key and the housing. The damping assembly is used to provide damping force so that the first operating key is delayed in returning to the initial position after the switch is turned off.

2. The electrosurgical instrument as described in claim 1, characterized in that, The travel of the first operating key includes a first position, a second position, and a third position. The second position is located between the first position and the third position. When the first position is in the first position, the first valve is in a closed state. When the first operating key moves to the second position, the first valve is opened. When the first operating key moves to the third position, the switch is triggered. or, The travel of the first operating key includes a first position and a second position. When the first operating key is in the first position, the first valve is in a closed state. When the first operating key moves to the second position, it opens the first valve and triggers the switch at the same time.

3. The electrosurgical instrument as described in claim 1, characterized in that, The damping assembly includes a friction element disposed between the valve body and the valve core, the friction element being mounted on one of the valve body and the valve core, and the friction element providing the damping force through friction with the other of the valve body and the valve core.

4. The electrosurgical instrument as described in claim 3, characterized in that, The friction element is a sealing ring installed on the inner wall of the valve body or on the outer wall of the valve core.

5. The electrosurgical instrument as described in claim 1, characterized in that, The first operation key includes an electric cutting button and an electric coagulation button. The switch includes an electric cutting contact and an electric coagulation contact. When the electric cutting button is pressed by an external force, the electric cutting contact is triggered. When the electric coagulation button is pressed by an external force, the electric coagulation contact is triggered.

6. The electrosurgical instrument as described in claim 5, characterized in that, The first valve includes a valve body, a first valve core, and a second valve core. The valve body includes: The main body includes an inner cavity and a first interface communicating with the inner cavity, the first interface being connected to the negative pressure device via a pipe; The first cylinder is installed on the side wall of the main body and communicates with the inner cavity. The first valve core is movably installed in the first cylinder. The electric cutting button is movably installed in the first cylinder and connected to the first valve core. The side wall of the first cylinder is provided with a second interface communicating with the first cylinder. The second interface is connected to the metal pipe through a pipe. The second cylinder is installed on the side wall of the main body and communicates with the inner cavity. The second valve core is movably installed in the second cylinder. The electrocoagulation button is movably installed in the second cylinder and connected to the second valve core. The second cylinder communicates with the first cylinder.

7. The electrosurgical instrument as described in claim 1, characterized in that, The first valve includes a valve body and a valve core, the valve body comprising: The main body includes an inner cavity and a first interface communicating with the inner cavity, the first interface being connected to the negative pressure device via a pipe; A cylindrical body is installed on the side wall of the main body and communicates with the inner cavity. The valve core is movably installed in the cylindrical body. The first operating key is movably installed in the cylindrical body and connected to the valve core. The side wall of the cylindrical body is provided with a second interface communicating with the cylindrical body. The second interface is connected to the metal pipe through a pipe.

8. The electrosurgical instrument as described in claim 1, characterized in that, Also includes: A cleaning pipeline, one end of which is installed inside the housing and connected to the metal tube, and the other end of which is connected to a cleaning fluid supply device, is used to deliver cleaning fluid into the metal tube to flush the diseased tissue. A second valve is installed in the cleaning pipeline to control the opening and closing of the cleaning pipeline; The second operating key is installed on the second valve. When the second operating key is driven by an external force, the second valve is opened.

9. The electrosurgical instrument as described in claim 8, characterized in that, Also includes: The drain pipe has one end connected to the metal pipe and the other end connected to a negative pressure device. The drain pipe is used to aspirate the waste liquid generated after rinsing the patient's tissue. A third valve is installed in the drain pipe to control the opening and closing of the drain pipe; A third operating key is installed on the third valve, and the third operating key opens the third valve when driven by an external force.

10. The electrosurgical instrument as described in claim 9, characterized in that, The first valve includes an inner cavity, a first interface, a second interface, and a third interface. The first interface, the second interface, and the third interface are all connected to the inner cavity. The smoke exhaust pipe includes a first pipe section and a second pipe section. The first pipe section connects the negative pressure device and the first interface, and the second pipe section connects the second interface and the metal pipe. The first valve is used to control the connection and disconnection between the second interface and the inner cavity. The drain pipe connects the metal pipe and the third interface, so that the drain pipe and the exhaust pipe share the second pipe section and the negative pressure device.

11. The electrosurgical instrument as described in claim 9, characterized in that, The first operation key, the second operation key, and the third operation key are buttons installed on the housing.

12. The electrosurgical instrument as described in claim 11, characterized in that, The housing includes a handle belly and a handle back opposite to the handle belly. The first operation key is located on the handle belly, and the second and third operation keys are arranged side by side on the handle back and close to the first end of the handle. The operation lever is connected to the first end of the handle.

13. The electrosurgical instrument as described in claim 9, characterized in that, The diameter of the cleaning pipeline is smaller than the diameter of the drain pipeline.

14. The electrosurgical instrument as described in claim 1, characterized in that, The control lever is detachably connected to the handle assembly.

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