A duckbill check valve for a plunger pump, a plunger pump and a high-frequency electrotome

Abstract

The utility model provides a kind of duckbill type check valve for plunger pump, plunger pump and high-frequency electrotome, duckbill type check valve includes second valve body and first valve body connected in order along liquid flow direction, first valve body includes support part and duckbill part connected in order along liquid flow direction, first cavity is formed in support part, the first end of two pieces of elastic lip petal of duckbill part is connected with support part, and two pieces of elastic lip petal gradually mutually close to flat duckbill shape along the direction of being away from support part, second cavity that adapts to the shape of duckbill part is formed between two pieces of elastic lip petal, first linear gap is formed between the second end end of two pieces of elastic lip petal as the outlet of second cavity;Second valve body is formed with at least one transition cavity, transition cavity includes third cavity, first cavity, second cavity and at least one transition cavity are sequentially connected in communication in the gradually smaller cross section along liquid flow direction. In plunger pump for high-frequency electrotome, liquid in cylinder can be effectively reduced to outside leakage.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a duckbill-type check valve for a plunger pump, a plunger pump, and a high-frequency electrosurgical unit. Background Technology

[0002] A high-frequency electrosurgical unit (HFEMU) is an electrosurgical instrument that replaces mechanical scalpels for tissue cutting. It heats tissue by generating a high-frequency, high-voltage current at the tip of its effective electrode, achieving tissue separation and coagulation, thus achieving cutting and hemostasis. During use, a suitable neutral electrode plate is required. This plate is attached to a muscle-rich area of ​​the patient, guiding the current collected within the body back to the HFEMU and other instruments, forming a complete high-frequency circuit. This disperses the current during high-frequency surgery, reducing the risk of current concentration, safely collecting and delivering the current to the outside of the body, and protecting the patient's safety.

[0003] Currently, there exists a water-injection type high-frequency electrosurgical unit with a water pump built into the handle. The water injection function of this unit is generally used to inject medical fluid submucosally to elevate lesions, thereby facilitating their removal. The water pump built into the handle is typically a plunger pump, which includes a drive assembly, a plunger assembly, and a cylinder. The plunger assembly is slidably connected to the cylinder, and the drive assembly is drively connected to the plunger assembly. The cylinder has an inlet and an outlet. The inlet communicates with an external infusion bag placed on the high-frequency electrosurgical unit, and the outlet communicates with the distal end of the high-frequency electrosurgical unit for water injection. Both the inlet and outlet are equipped with inlet and outlet check valves.

[0004] The working principle of a plunger pump is as follows: the drive assembly drives the plunger assembly to reciprocate within the cylinder, causing the volume within the cylinder to alternately increase and decrease. When the volume within the cylinder increases, creating negative pressure, the inlet check valve opens and the outlet check valve closes, allowing liquid to enter the cylinder from the infusion bag through the inlet. When the volume within the cylinder decreases, creating positive pressure, the inlet check valve closes and the outlet check valve opens, allowing liquid within the cylinder to flow through the outlet and be ejected from the distal end of the high-frequency electrosurgical unit for water injection into the submucosal tissue. Currently, the outlet check valves used are generally duckbill type check valves, such as... Figure 1 As shown, the inlet end of this duckbill-type one-way valve is a cylindrical connecting pipe, and the outlet end is flat and duckbill-shaped. The outlet end includes two symmetrical elastic lips 413, which form a linear gap between them in their natural state. When the volume inside the cylinder increases, creating a negative pressure, the lips will squeeze together and close under the negative pressure. When the volume inside the cylinder decreases, creating a positive pressure, the fluid pushes the duckbill lips open outwards under the positive pressure.

[0005] However, in the use of water-filled high-frequency electrosurgical units, when the electrosurgical unit is not being used with water, the liquid remaining in the cylinder can easily leak through the gap between the two elastic lips 413 of the duckbill-type check valve, thus affecting the normal cutting and coagulation operation of the high-frequency electrosurgical unit. In particular, the infusion bag is often mounted higher than the operating position of the high-frequency electrosurgical unit, which makes the water level in the infusion bag higher than the water level in the plunger pump cylinder. When the high-frequency electrosurgical unit is not being used with water, the liquid in the infusion bag may enter the cylinder through the inlet check valve due to its own water pressure, thereby promoting the leakage of liquid in the cylinder through the gap between the two elastic lips 413 of the duckbill-type check valve.

[0006] Therefore, there is an urgent need for an improved duckbill-type check valve for plunger pumps, a plunger pump, and a high-frequency electrosurgical unit. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] In view of the problems existing in the above-mentioned technology, the present invention provides solutions to at least some extent. Therefore, the first objective of the present invention is to provide a duckbill-type check valve for a plunger pump, which, when used in a high-frequency electrosurgical unit, can effectively reduce liquid leakage from the cylinder body; the second objective of the present invention is to provide a plunger pump with the aforementioned discharge check valve; and the third objective of the present invention is to provide a high-frequency electrosurgical unit with the aforementioned plunger pump.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0011] In a first aspect, this utility model provides a duckbill-type check valve for a plunger pump, comprising a second valve body and a first valve body connected sequentially along the liquid flow direction. The first valve body includes a support portion and a duckbill portion connected sequentially along the liquid flow direction. The support portion is tubular and forms a first cavity within it. The duckbill portion includes two elastic lips, the first ends of which are connected to the support portion. The two elastic lips gradually approach each other in a flattened duckbill shape along the direction away from the support portion. A second cavity with a conical cross-section adapted to the shape of the duckbill portion is formed between the two elastic lips. A first linear gap is formed between the second ends of the two elastic lips as the outlet of the second cavity. The first cavity and the second cavity are connected. At least one transition cavity is formed within the second valve body. The transition cavity includes a third cavity, the cross-section of which gradually decreases along the liquid flow direction. The first cavity, the second cavity, and at least one transition cavity are connected in series.

[0012] Optionally, the shape of the third cavity is the same as that of the second cavity.

[0013] Optionally, the inlet cross-sectional area of ​​the second cavity is 7–15 mm².2 The outlet cross-sectional area of ​​the second cavity is 0.2–0.65 mm². 2 The ratio of the inlet cross-sectional area of ​​the second cavity to the outlet cross-sectional area of ​​the second cavity is 13 to 22; the inlet cross-sectional area of ​​the third cavity is the same as that of the second cavity, and the ratio of the outlet cross-sectional area of ​​the third cavity to that of the second cavity is 1 to 4.

[0014] Optionally, the outlet of the third cavity is a second linear slit, the length of the first linear slit is the same as the length of the second linear slit, the gap distance of the first linear slit in the natural state is 0.05 to 0.1 mm, the gap distance of the second linear slit in the natural state is 0.1 to 0.2 mm, and the difference between the gap distance of the first linear slit in the natural state and the gap distance of the second linear slit in the natural state is greater than 0.05 mm.

[0015] Optionally, the first cavity is cylindrical, and the first cavity and the second cavity are coaxially arranged, with the inlet edge of the second cavity located outside the outlet edge of the first cavity.

[0016] Optionally, the ratio of the inlet cross-sectional area of ​​the second cavity to the outlet cross-sectional area of ​​the first cavity is 1.1 to 1.3.

[0017] Optionally, the transition cavity further includes a fourth cavity, which is connected to the third cavity in sequence along the liquid flow direction. The shape of the third cavity is the same as that of the second cavity, the shape of the fourth cavity is the same as that of the first cavity, and the size of the fourth cavity is the same as that of the first cavity.

[0018] Optionally, the support and the second valve body are connected together to form a cylinder, and at least one sealing ring is fixedly sleeved on the cylinder.

[0019] Secondly, this utility model provides a plunger pump, including a drive assembly, a plunger assembly, and a cylinder. The plunger assembly is slidably connected to the cylinder, and the drive assembly is drively connected to the plunger assembly. The cylinder has an inlet pipe and an outlet pipe. The inlet pipe is provided with an inlet check valve, and the outlet pipe is provided with an outlet check valve as described above. The drive assembly drives the plunger assembly to reciprocate to change the volume of the cylinder.

[0020] Thirdly, this utility model provides a high-frequency electrosurgical unit, including a handle and a shaft assembly connected sequentially from near to far. The distal end of the shaft assembly forms an operating end, and a plunger pump as described above is installed inside the handle for supplying water to the operating end.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are:

[0023] The duckbill-shaped check valve provided by this utility model serves as a liquid outlet check valve in the plunger pump of a high-frequency electrosurgical unit. When the volume inside the cylinder increases, creating negative pressure, the two elastic lips will press against each other and close. When the volume inside the cylinder decreases, creating positive pressure, the fluid pushes the two elastic lips outward, thus functioning as a liquid outlet check valve. By connecting the second and third chambers in series, at least two levels of reverse sealing barriers are formed. When the high-frequency electrosurgical unit is not used with water injection, the liquid inside the cylinder must continuously pass through at least two gradually narrowing flow channels. Compared with the duckbill-shaped check valve in the prior art, the total length of the flow path is increased, and the flow resistance coefficient is improved, thereby greatly reducing leakage and facilitating the normal cutting and coagulation operation of the high-frequency electrosurgical unit.

[0024] The plunger pump provided by this utility model adopts the above-mentioned liquid outlet check valve, which can effectively reduce the leakage of liquid from the cylinder body when the high-frequency electrosurgical unit is not used for water injection.

[0025] The high-frequency electrosurgical unit provided by this utility model uses the aforementioned plunger pump, which can effectively reduce liquid leakage from the cylinder when the high-frequency electrosurgical unit is not used with water. Attached Figure Description

[0026] This utility model is described with reference to the following drawings:

[0027] Figure 1 This is a three-dimensional structural diagram of a duckbill-type check valve based on the background technology;

[0028] Figure 2 This is a schematic diagram of the high-frequency electrosurgical unit according to Embodiment 1;

[0029] Figure 3 This is a cross-sectional schematic diagram of the high-frequency electrosurgical unit according to Example 1;

[0030] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a three-dimensional structural schematic diagram of the duckbill-type check valve according to Embodiment 1;

[0032] Figure 6 yes Figure 5 A cross-sectional view of a duckbill-type check valve in the first section;

[0033] Figure 7 yes Figure 5 A cross-sectional view of a duckbill-type check valve at the second section, which is perpendicular to the first section;

[0034] Figure 8 This is a cross-sectional schematic diagram of the duckbill-type check valve according to Example 1.

[0035] [Explanation of Labels in the Attached Image]

[0036] 1: Handle;

[0037] 11: Longitudinal shell; 12: Transverse shell;

[0038] 2: Shaft assembly;

[0039] 31: Drive assembly; 32: Piston assembly; 33: Cylinder block;

[0040] 41: First valve body; 42: Second valve body; 43: Sealing ring;

[0041] 411: Support portion; 412: First cavity; 413: Elastic lip; 414: Second cavity; 415: First linear slit;

[0042] 421: Third cavity; 422: Second linear slit; 423: Fourth cavity. Detailed Implementation

[0043] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, "near" refers to the side closer to the operator, and "far" refers to the side closer to the patient. The directional terms "front," "back," "up," and "down" used in this document are... Figure 2 The orientation is taken as a reference, where the direction from near to far is also the direction from back to front.

[0044] Example 1

[0045] like Figures 2 to 7 As shown, this embodiment provides a high-frequency electrosurgical unit. The high-frequency electrosurgical unit includes a handle 1 and a shaft assembly 2 connected sequentially from near to far. The distal end of the shaft assembly 2 forms an operating end, and a plunger pump for supplying water to the operating end is installed inside the handle 1.

[0046] The plunger pump includes a drive assembly 31, a plunger assembly 32, and a cylinder 33. The plunger assembly 32 is slidably connected to the cylinder 33, and the drive assembly 31 is driveably connected to the plunger assembly 32. The drive assembly 31 drives the plunger assembly 32 to reciprocate, thereby changing the volume of the cylinder 33. The cylinder 33 has an inlet pipe and an outlet pipe. An inlet check valve is installed in the inlet pipe, and an outlet check valve is installed in the outlet pipe. When the volume inside the cylinder 33 increases, creating a negative pressure, the inlet check valve opens and the outlet check valve closes under the negative pressure, allowing liquid to enter the cylinder 33 from the infusion bag through the inlet port. When the volume inside the cylinder 33 decreases, creating a positive pressure, the inlet check valve closes and the outlet check valve opens under the positive pressure, allowing liquid inside the cylinder 33 to flow through the outlet port and be ejected from the distal end of the high-frequency electrosurgical unit.

[0047] The liquid outlet check valve is a duckbill-type check valve. This duckbill-type check valve includes a second valve body 42 and a first valve body 41 connected sequentially along the liquid flow direction. The first valve body 41 includes a support portion 411 and a duckbill portion connected sequentially along the liquid flow direction. The support portion 411 is tubular, and a first cavity 412 is formed within the support portion 411. The duckbill portion includes two elastic lips 413. The first ends of both elastic lips 413 are connected to the support portion 411, and the two elastic lips 413 gradually approach each other in a flattened duckbill shape along the direction away from the support portion 411. A second cavity 414 with a conical cross-section adapted to the shape of a duckbill is formed between the two elastic lip flaps 413. A first linear gap 415 is formed between the second ends of the two elastic lip flaps 413 as the outlet of the second cavity 414. The first cavity 412 and the second cavity 414 are connected. At least one transition cavity is formed in the second valve body 42. The transition cavity includes a third cavity 421. The cross-section of the third cavity 421 gradually decreases along the liquid flow direction. The first cavity 412, the second cavity 414 and the at least one transition cavity are connected in series.

[0048] This duckbill-shaped check valve, when the volume inside the cylinder 33 increases, creating negative pressure, causes the two elastic lips 413 to press and close together. When the volume inside the cylinder 33 decreases, creating positive pressure, the fluid pushes the two elastic lips 413 outward, allowing it to function as a liquid outlet check valve. By connecting the second chamber 414 and the third chamber 421 in series, at least two levels of reverse sealing barriers are formed. When the high-frequency electrosurgical unit is not used with water, the liquid inside the cylinder 33 must continuously pass through at least two converging flow channels. Compared to the duckbill-shaped check valve in the prior art, the total flow path length is increased, and the flow resistance coefficient is improved, thereby greatly reducing leakage and facilitating the normal cutting and coagulation operation of the high-frequency electrosurgical unit.

[0049] Preferably, the shape of the third cavity 421 is the same as that of the second cavity 414. This facilitates manufacturing and further enhances the leak-proof effect.

[0050] Preferably, the inlet cross-sectional area of ​​the second cavity 414 is 7–15 mm². 2 The outlet cross-sectional area of ​​the second cavity 414 is 0.2–0.65 mm². 2The ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the second cavity 414 is 13–22; the inlet cross-sectional area of ​​the third cavity 421 is the same as that of the second cavity 414, and the ratio of the outlet cross-sectional area to that of the second cavity 414 is 1–4. This arrangement of the inlet and outlet cross-sectional areas of the second and third cavities 421 ensures that the conical flow channels of the second and third cavities 414 effectively attenuate the kinetic energy of the seepage.

[0051] More preferably, the outlet of the third cavity 421 is a second linear slit 422. The length of the first linear slit 415 is the same as the length of the second linear slit 422. In its natural state, the gap distance of the first linear slit 415 is 0.05–0.1 mm, and the gap distance of the second linear slit in its natural state is 0.1–0.2 mm. The difference between the gap distance of the first linear slit 415 and the gap distance of the second linear slit in its natural state is greater than 0.05 mm. The gap difference design of the first linear slit 415 and the second linear slit 422 can form a pressure oscillation buffer zone, suppressing instantaneous leakage caused by fluid pulses.

[0052] Preferably, the first cavity 412 is cylindrical, and the first cavity 412 and the second cavity 414 are coaxially arranged, with the inlet edge of the second cavity 414 located outside the outlet edge of the first cavity 412. This further attenuates the kinetic energy of the seepage. More preferably, the ratio of the inlet cross-sectional area of ​​the second cavity 414 to the outlet cross-sectional area of ​​the first cavity 412 is 1.1 to 1.3.

[0053] Preferably, the transition cavity further includes a fourth cavity 423, which is sequentially connected to the third cavity 421 along the liquid flow direction. The shape of the third cavity 421 is the same as that of the second cavity 414, and the shape of the fourth cavity 423 is the same as that of the first cavity 412. The dimensions of the fourth cavity 423 are the same as those of the first cavity 412. This facilitates manufacturing and improves the attenuation effect on seepage kinetic energy, thereby enhancing the leak-proof effect.

[0054] Specifically, in this embodiment, the transition cavity is a fourth cavity 423 and a third cavity 421 connected in sequence, and the second linear gap 422 of the third cavity 421 is connected to the first cavity 412.

[0055] Preferably, the support portion 411 and the second valve body 42 are connected to form a cylinder, and at least one sealing ring 43 is fixedly fitted on the cylinder. This facilitates the installation and sealing of the duckbill-type check valve in the outlet pipe.

[0056] It should be noted that the first valve body 41 and the second valve body 42 can be separate parts or an integral part. Specifically, in this embodiment, the first valve body 41 and the second valve body 42 are an integral part. Further, in this embodiment, the first valve body 41, the second valve body 42, and the sealing ring 43 are an integral part.

[0057] The duckbill-type check valve can be made of elastic materials such as silicone, rubber, polyurethane, and acrylate. Specifically, in this embodiment, the duckbill-type check valve is made of rubber.

[0058] Specifically, in this embodiment, a transition cavity is formed within the second valve body 42.

[0059] Specifically, in this embodiment, the handle 1 includes a longitudinal shell 11 and a transverse shell 12 connected sequentially from bottom to top. The longitudinal shell 11 is used for gripping and forms a longitudinal cavity. The transverse shell 12 forms a transverse cavity that communicates with the longitudinal cavity. The plunger pump is housed in the longitudinal cavity and fixedly connected to the longitudinal shell 11. The shaft assembly 2 is connected to the transverse shell 12. Here, longitudinal refers to the vertical direction, and transverse refers to the front-to-back direction.

[0060] Example 2

[0061] The main difference between this embodiment and Embodiment 1 is:

[0062] like Figure 8 As shown, two transition cavities are formed in series within the second valve body 42.

[0063] The remaining contents are the same as in Example 1, and will not be repeated here.

[0064] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A duckbill-type check valve for a plunger pump, characterized in that, The system includes a second valve body (42) and a first valve body (41) connected sequentially along the liquid flow direction. The first valve body (41) includes a support part (411) and a duckbill part connected sequentially along the liquid flow direction. The support part (411) is tubular and forms a first cavity (412) inside the support part (411). The duckbill part includes two elastic lips (413). The first ends of the two elastic lips (413) are connected to the support part (411), and the two elastic lips (413) gradually approach each other in a flat duckbill shape in a direction away from the support part (411). A second cavity (414) with a conical cross-section adapted to the shape of the duckbill part is formed between the two elastic lips (413). A first linear slit (415) is formed between the second ends of the two elastic lips (413) as the outlet of the second cavity (414). The first cavity (412) and the second cavity (414) are connected. At least one transition cavity is formed inside the second valve body (42), the transition cavity includes a third cavity (421), the cross-section of the third cavity (421) gradually decreases along the liquid flow direction, and the first cavity (412), the second cavity (414) and at least one transition cavity are connected in series in sequence.

2. The duckbill-type check valve for a plunger pump according to claim 1, characterized in that, The third cavity (421) has the same shape as the second cavity (414).

3. The duckbill-type check valve for a plunger pump according to claim 2, characterized in that, The inlet cross-sectional area of ​​the second cavity (414) is 7-15 mm². 2 The outlet cross-sectional area of ​​the second cavity (414) is 0.2–0.65 mm². 2 The ratio of the inlet cross-sectional area of ​​the second cavity (414) to the outlet cross-sectional area of ​​the second cavity (414) is 13 to 22. The inlet cross-sectional area of ​​the third cavity (421) is the same as that of the second cavity (414), and the ratio of the outlet cross-sectional area of ​​the third cavity (421) to the outlet cross-sectional area of ​​the second cavity (414) is 1 to 4.

4. The duckbill-type check valve for a plunger pump according to claim 3, characterized in that, The outlet of the third cavity (421) is the second linear slit (422). The length of the first linear slit (415) is the same as the length of the second linear slit (422). In its natural state, the gap distance of the first linear slit (415) is 0.05 to 0.1 mm, and the gap distance of the second linear slit in its natural state is 0.1 to 0.2 mm. The difference between the gap distance of the first linear slit (415) in its natural state and the gap distance of the second linear slit in its natural state is greater than 0.05 mm.

5. The duckbill-type check valve for a plunger pump according to claim 1, characterized in that, The first cavity (412) is cylindrical, and the first cavity (412) and the second cavity (414) are coaxially arranged. The inlet edge of the second cavity (414) is located outside the outlet edge of the first cavity (412).

6. The duckbill-type check valve for a plunger pump according to claim 5, characterized in that, The ratio of the inlet cross-sectional area of ​​the second cavity (414) to the outlet cross-sectional area of ​​the first cavity (412) is 1.1 to 1.

3.

7. The duckbill-type check valve for a plunger pump according to claim 1, characterized in that, The transition cavity also includes a fourth cavity (423), which is connected to the third cavity (421) in sequence along the liquid flow direction. The shape of the third cavity (421) is the same as that of the second cavity (414), the shape of the fourth cavity (423) is the same as that of the first cavity (412), and the size of the fourth cavity (423) is the same as that of the first cavity (412).

8. The duckbill-type check valve for a plunger pump according to claim 1, characterized in that, The support (411) and the second valve body (42) are connected to form a cylinder, and at least one sealing ring (43) is fixedly sleeved on the cylinder.

9. A plunger pump, characterized in that, The pump includes a drive assembly, a plunger assembly, and a cylinder. The plunger assembly is slidably connected to the cylinder, and the drive assembly is drively connected to the plunger assembly. The cylinder has an inlet pipe and an outlet pipe. The inlet pipe is equipped with an inlet check valve, and the outlet pipe is equipped with a duckbill-type check valve for a plunger pump as described in any one of claims 1 to 8. The drive assembly drives the plunger assembly to reciprocate to change the volume of the cylinder.

10. A high-frequency electrosurgical unit, characterized in that, It includes a handle (1) and a shaft assembly (2) connected sequentially from near to far, the far end of the shaft assembly (2) forming an operating end, and a plunger pump as described in claim 9 is installed in the handle (1) for supplying water to the operating end.

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