Waterproof high-frequency electrotome

Abstract

The utility model provides a kind of water leakage prevention's high frequency electrotome, its handle is equipped with for the plunger pump of water supply to operating end, the cylinder body of plunger pump has liquid inlet pipe and liquid outlet pipe, liquid inlet pipe is provided with liquid inlet check valve, liquid outlet check valve includes elastic member and plugging element, liquid outlet pipe includes the main pipe body used as the valve body of liquid outlet check valve, first lumen and second lumen are formed in the main pipe body and are sequentially communicated along liquid flow direction, second lumen is fixed with elastic member installation site, the first end of elastic member is connected with elastic member installation site, the second end of elastic member is connected with plugging element;Natural state, elastic member is in yield state, the elastic effect of elastic member drives plugging element to abut and block the liquid outlet of first lumen;The volume of cylinder body is smaller, liquid in cylinder body can promote plugging element to open the liquid outlet of first lumen, make liquid discharge after flowing through second lumen.Effective prevention that liquid in cylinder body leaks out when high frequency electrotome does not carry out water injection use.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a high-frequency electrosurgical unit that is leak-proof. 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 61, and the outlet end is flat and duckbill-shaped, including two symmetrical elastic lips 62. In its natural state, a linear gap is formed between the two elastic lips 62. When the volume inside the cylinder increases, creating a negative pressure, the lips 62 will squeeze together and close under the action of the negative pressure. When the volume inside the cylinder decreases, creating a positive pressure, the fluid pushes the duckbill lips 62 to open outward under the action of the positive pressure.

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

[0006] Therefore, there is an urgent need for an improved high-frequency electrosurgical unit that prevents water leakage. 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 purpose of the present invention is to provide a water-proof high-frequency electrosurgical unit that can effectively prevent liquid from leaking out of the cylinder when the high-frequency electrosurgical unit is not being used with water.

[0009] (II) Technical Solution

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

[0011] This utility model provides a water-proof high-frequency electrosurgical unit, including a handle and a shaft assembly connected sequentially from near to far. The far end of the shaft assembly forms an operating end. A plunger pump for supplying water to the operating end is installed inside the handle. The cylinder of the plunger pump has an inlet pipe and an outlet pipe. An inlet check valve is provided in the inlet pipe, and an outlet check valve is provided in the outlet pipe. The outlet check valve includes an elastic element and a sealing element. The outlet pipe includes a main body that serves as the valve body for the outlet check valve. A first cavity and a second cavity are formed in the main body that are sequentially connected along the liquid flow direction. An elastic element mounting position is fixed in the second cavity. The first end of the elastic element is connected to the elastic element mounting position, and the second end of the elastic element is connected to the sealing element.

[0012] In its natural state, the elastic element is in a yielding state. The elasticity of the elastic element drives the sealing element to abut against and seal the outlet of the first cavity. The internal volume of the cylinder becomes smaller, and the liquid inside the cylinder can push the sealing element to open the outlet of the first cavity, allowing the liquid to flow through the second cavity and be discharged.

[0013] Optionally, the elastic element mounting position is a first annular groove coaxially arranged with the second cavity, and the opening of the first annular groove faces the liquid outlet of the first cavity; the elastic element is a spring, the first end of the spring is inserted into the first annular groove, and the second end of the spring is connected to the sealing element; in the natural state, the elastic element is in a compressed state, and the elastic action of the elastic element drives the sealing element to abut against and seal the liquid outlet of the first cavity.

[0014] Optionally, an annular boss is provided circumferentially along the wall of the second pipe cavity, and a first annular groove is formed on the annular boss. The outlet of the second pipe cavity is located on the side of the first annular groove away from the outlet of the first pipe cavity. The first annular groove has an outer annular groove wall and an inner annular groove wall, and a through hole is formed on the inner annular groove wall.

[0015] Optionally, the through hole extends axially along the first annular groove and penetrates the inner annular groove wall toward the liquid outlet of the first tube cavity.

[0016] Optionally, multiple through holes are provided on the inner ring groove wall, and the multiple through holes are evenly distributed along the circumference of the inner ring groove wall.

[0017] Optionally, the main body is a straight pipe, and the second cavity is divided by the first annular groove into a first pipe area and a second pipe area that are connected sequentially along the liquid flow direction. The outer annular groove wall is the pipe wall of the first pipe area, and the inner diameter of the inner annular groove wall is the same as the pipe diameter of the second pipe area. The pipe diameter of the first pipe area is larger than the pipe diameter of the first cavity, and the first cavity and the second cavity are coaxially arranged.

[0018] Optionally, the main body includes a first tube and a second tube. A first cavity is formed inside the first tube, and an insertion cavity communicating with the first cavity is formed at the end of the first tube. A second cavity is formed inside the second tube, and a sealing ring is fitted at the end of the second tube. The end of the second tube is inserted into the insertion cavity, and the sealing ring seals between the first tube and the second tube.

[0019] Optionally, the outlet of the second cavity is located on the side of the sealing member away from the outlet of the first cavity, and there is a gap between the sealing member and the wall of the second cavity, and a gap between the elastic member and the wall of the second cavity.

[0020] Optionally, the sealing element can be spherical, conical, frustum-shaped, or cylindrical.

[0021] Optionally, the sealing element is spherical, and the outlet of the first cavity has a contact surface adapted to the shape of the sealing element; or,

[0022] The sealing element is conical, and the outlet of the first cavity has a contact surface that matches the curved surface of the sealing element; or,

[0023] The sealing element is frustoconical, and the outlet of the first cavity has a contact surface that matches the curved surface of the sealing element.

[0024] (III) Beneficial Effects

[0025] The beneficial effects of this utility model are:

[0026] The high-frequency electrosurgical unit provided by this utility model uses a liquid outlet check valve in the form of an elastic element and a sealing element. In its natural state, the elasticity of the elastic element causes the sealing element to abut against and seal the outlet of the first cavity, making it difficult for liquid inside the cylinder to leak out through the outlet. The elasticity of the elastic element counteracts the liquid pressure inside the cylinder. Even if the liquid level in the infusion bag is higher than the liquid level in the plunger pump cylinder, creating pressure within the cylinder, it is difficult to overcome the elasticity of the elastic element to push open the sealing element and allow the liquid to flow out of the outlet of the first cavity. This effectively prevents liquid leakage from the cylinder when the high-frequency electrosurgical unit is not being used with water. When the internal volume of the cylinder decreases, compressing the liquid, the liquid inside the cylinder can push the sealing element to open the outlet of the first cavity, allowing the liquid to flow through the second cavity and be discharged. This ensures normal liquid supply from the cylinder to the operating end, thus guaranteeing normal water-filling operation of the high-frequency electrosurgical unit. Attached Figure Description

[0027] This utility model is described with reference to the following drawings:

[0028] Figure 1 This is a three-dimensional structural diagram of a duckbill-type check valve based on the background technology;

[0029] Figure 2 This is a schematic diagram of the structure of the leak-proof high-frequency electrosurgical unit according to Example 1;

[0030] Figure 3 This is a cross-sectional schematic diagram of a high-frequency electrosurgical unit for preventing water leakage according to Example 1;

[0031] Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0032] [Explanation of Labels in the Attached Image]

[0033] 1: Handle;

[0034] 11: Longitudinal shell; 12: Transverse shell;

[0035] 2: Shaft assembly;

[0036] 31: Drive assembly; 32: Piston assembly; 33: Cylinder block;

[0037] 41: Elastic component; 42: Sealing component;

[0038] 51: First cavity; 52: First annular groove; 53: Through hole; 55: First pipe area; 56: Second pipe area; 57: First pipe body; 58: Second pipe body; 59: Sealing ring;

[0039] 61: Cylindrical connecting tube; 62: Lip. Detailed Implementation

[0040] 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.

[0041] Example 1

[0042] like Figures 2 to 4 As shown, this embodiment provides a water-proof high-frequency electrosurgical unit. The water-proof 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.

[0043] 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.

[0044] The liquid outlet check valve includes an elastic element 41 and a sealing element 42. The liquid outlet pipe includes a main body used as the valve body of the liquid outlet check valve. A first cavity 51 and a second cavity are formed in the main body, which are connected sequentially along the liquid flow direction. The elastic element 41 is fixedly mounted in the second cavity. The first end of the elastic element 41 is connected to the elastic element 41 mounting position, and the second end of the elastic element 41 is connected to the sealing element 42. In its natural state, the elastic element 41 is in a yielding state. The elastic action of the elastic element 41 drives the sealing element 42 to abut against and block the liquid outlet of the first cavity 51. The internal volume of the cylinder 33 decreases, compressing the liquid. The liquid in the cylinder 33 can push the sealing element 42 to open the liquid outlet of the first cavity 51, allowing the liquid to flow through the second cavity and be discharged.

[0045] This high-frequency electrosurgical unit, with its liquid outlet check valve configured as an elastic element 41 and a sealing element 42, allows the elastic element 41 to cause the sealing element 42 to abut against and seal the outlet of the first cavity 51 under normal conditions. This makes it difficult for the liquid inside the cylinder 33 to leak out through the outlet of the first cavity 51. The elastic element 41 also counteracts the liquid pressure inside the cylinder 33. Even if the liquid level in the infusion bag is higher than the liquid level in the plunger pump cylinder 33, giving the liquid inside the cylinder 33 a certain pressure, it is still difficult to overcome the elastic element 41 to push open the sealing element 42 and flow out of the outlet of the first cavity 51. This effectively prevents the liquid inside the cylinder 33 from leaking out when the high-frequency electrosurgical unit is not being used with water. The reduced volume of the cylinder 33 compresses the liquid, allowing the liquid inside the cylinder 33 to push the sealing component 42 to open the outlet of the first chamber 51, so that the liquid can flow through the second chamber and be discharged, thus ensuring the normal liquid supply from the cylinder 33 to the operating end, which in turn ensures the normal water injection of the high-frequency electrosurgical unit.

[0046] Preferably, the elastic element 41 is mounted in a first annular groove 52 coaxially with the second cavity, with the opening of the first annular groove 52 facing the outlet of the first cavity 51. The elastic element 41 is a spring, with its first end inserted into the first annular groove 52 and its second end connected to the sealing element 42. In its natural state, the elastic element 41 is compressed, and its elasticity causes the sealing element 42 to abut against and seal the outlet of the first cavity 51. This configuration results in a simple structure and facilitates the manufacturing of the cylinder body 33.

[0047] Preferably, an annular boss is provided circumferentially along the wall of the second cavity within the second cavity, and a first annular groove 52 is formed on the annular boss. The outlet of the second cavity is located on the side of the first annular groove 52 away from the outlet of the first cavity 51. The first annular groove 52 has an outer annular groove wall and an inner annular groove wall, and a through hole 53 is formed on the inner annular groove wall. In this way, by forming a through hole 53 on the inner annular groove wall, the liquid in the cylinder 33 can flow through the through hole 53 to the side of the first annular groove 52 away from the outlet of the first cavity 51, and then flow out from the outlet of the second cavity.

[0048] Furthermore, the outer annular groove wall serves as the wall of the second cavity. This facilitates the machining and manufacturing of the cylinder block 33.

[0049] More preferably, the through hole 53 extends axially along the first annular groove 52 and penetrates the inner annular groove wall toward the liquid outlet of the first cavity 51. This further facilitates the flow of liquid in the cylinder 33 through the through hole 53 to the side of the first annular groove 52 away from the liquid outlet of the first cavity 51, ensuring the water injection function of the high-frequency electrosurgical unit.

[0050] More preferably, the inner annular groove wall has multiple through holes 53, which are evenly distributed circumferentially along the inner annular groove wall. This further facilitates the flow of liquid in the cylinder 33 through the through holes 53 to the side of the first annular groove 52 away from the liquid outlet of the first pipe cavity 51. Specifically, in this embodiment, the inner annular groove wall has four through holes 53, which are evenly distributed circumferentially along the inner annular groove wall.

[0051] Preferably, the main pipe is a straight pipe, and the second cavity is divided by the first annular groove 52 into a first pipe section 55 and a second pipe section 56 that are sequentially connected along the liquid flow direction. The outer annular groove wall is the pipe wall of the first pipe section 55, and the inner diameter of the inner annular groove wall is the same as the pipe diameter of the second pipe section 56. The pipe diameter of the first pipe section 55 is larger than the pipe diameter of the first cavity 51, and the first cavity 51 and the second cavity are coaxially arranged. This shape of the main pipe facilitates the machining and manufacturing of the cylinder body 33.

[0052] More preferably, the main pipe includes a first tube 57 and a second tube 58. A first cavity 51 is formed within the first tube 57, and an insertion cavity communicating with the first cavity 51 is formed at one end of the first tube 57. A second cavity is formed within the second tube 58, and a sealing ring 59 is fitted onto the end of the second tube 58. The end of the second tube 58 is inserted into the insertion cavity, and the sealing ring 59 seals between the first tube 57 and the second tube 58. This configuration of the main pipe facilitates its processing, manufacturing, and assembly, reducing costs.

[0053] Preferably, the outlet of the second cavity is located on the side of the sealing member 42 away from the outlet of the first cavity 51, and there is a gap between the sealing member 42 and the wall of the second cavity, and a gap between the elastic member 41 and the wall of the second cavity. Thus, after the liquid in the cylinder 33 pushes the sealing member 42 to open the outlet of the first cavity 51, the liquid in the cylinder 33 can pass through the gap and flow to the outlet of the second cavity for discharge.

[0054] Preferably, in this embodiment, the sealing element 42 is spherical, and the outlet of the first cavity 51 has an abutment surface that matches the shape of the sealing element 42. Thus, the sealing element 42 abuts against the outlet of the first cavity 51, resulting in a good sealing effect.

[0055] It should be noted that the sealing element 42 can be made of either a rigid or elastic material. Specifically, in this embodiment, the sealing element 42 is a steel ball.

[0056] Furthermore, a second annular groove is provided at the end of the sealing member 42 away from the liquid outlet of the first tube 51, and the second end of the elastic member 41 is inserted into the second annular groove. In this way, the connection between the elastic member 41 and the sealing member 42 is more stable.

[0057] It should be noted that in this embodiment, the elastic element 41 being a spring is only a preferred option. It is conceivable that the elastic element 41 could also be a rubber element.

[0058] 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.

[0059] Example 2

[0060] The main difference between this embodiment and Embodiment 1 is:

[0061] The sealing element 42 is conical, and the outlet of the first cavity 51 has a contact surface that matches the curved shape of the sealing element 42. Thus, the sealing element 42 abuts against the outlet of the first cavity 51, resulting in a good sealing effect.

[0062] The remaining contents are the same as in Example 1, and will not be repeated here.

[0063] Example 3

[0064] The main difference between this embodiment and Embodiment 1 is:

[0065] The sealing element 42 is frustoconical in shape, and the outlet of the first cavity 51 has a contact surface that matches the curved shape of the sealing element 42. In this way, the sealing element 42 abuts against the outlet of the first cavity 51, resulting in a good sealing effect.

[0066] The remaining contents are the same as in Example 1, and will not be repeated here.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 water-proof 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) forms an operating end. A plunger pump for supplying water to the operating end is installed inside the handle (1). The cylinder body (33) of the plunger pump 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. The outlet check valve includes an elastic element (41) and a sealing element (42). The outlet pipe includes a main body that serves as the valve body for the outlet check valve. A first cavity (51) and a second cavity are formed in the main body that are connected sequentially along the liquid flow direction. An installation position for the elastic element (41) is fixed in the second cavity. The first end of the elastic element (41) is connected to the installation position of the elastic element (41), and the second end of the elastic element (41) is connected to the sealing element (42). In its natural state, the elastic element (41) is in a yielding state. The elasticity of the elastic element (41) drives the sealing element (42) to abut against and seal the outlet of the first cavity (51). The internal volume of the cylinder (33) becomes smaller, and the liquid inside the cylinder (33) can push the sealing element (42) to open the outlet of the first cavity (51), allowing the liquid to flow through the second cavity and then be discharged.

2. The high-frequency electrosurgical unit for preventing water leakage according to claim 1, characterized in that, The elastic element (41) is installed in a first annular groove (52) coaxially with the second cavity. The opening of the first annular groove (52) faces the outlet of the first cavity (51). The elastic element (41) is a spring. The first end of the spring is inserted into the first annular groove (52), and the second end of the spring is connected to the sealing element (42). In its natural state, the elastic element (41) is in a compressed state. The elastic action of the elastic element (41) drives the sealing element (42) to abut against and seal the outlet of the first cavity (51).

3. The high-frequency electrosurgical unit for preventing water leakage according to claim 2, characterized in that, An annular boss is provided along the circumference of the wall of the second tube. A first annular groove (52) is opened on the annular boss. The outlet of the second tube is located on the side of the first annular groove (52) away from the outlet of the first tube (51). The first annular groove (52) has an outer annular groove wall and an inner annular groove wall. A through hole (53) is opened on the inner annular groove wall.

4. The high-frequency electrosurgical unit for preventing water leakage according to claim 3, characterized in that, The through hole (53) extends axially along the first annular groove (52) and penetrates the inner annular groove wall toward the liquid outlet of the first tube (51).

5. The high-frequency electrosurgical unit for preventing water leakage according to claim 4, characterized in that, Multiple through holes (53) are provided on the inner ring groove wall, and the multiple through holes (53) are evenly distributed along the circumference of the inner ring groove wall.

6. The high-frequency electrosurgical unit for preventing water leakage according to claim 2, characterized in that, The main body is a straight pipe. The second cavity is divided into a first pipe area (55) and a second pipe area (56) connected sequentially along the liquid flow direction by a first annular groove (52). The outer annular groove wall is the pipe wall of the first pipe area (55). The inner diameter of the inner annular groove wall is the same as the pipe diameter of the second pipe area (56). The pipe diameter of the first pipe area (55) is larger than the pipe diameter of the first cavity (51). The first cavity (51) and the second cavity are coaxially arranged.

7. The high-frequency electrosurgical unit for preventing water leakage according to claim 6, characterized in that, The main body includes a first tube (57) and a second tube (58). A first cavity (51) is formed inside the first tube (57). An insertion cavity communicating with the first cavity (51) is formed at the end of the first tube (57). A second cavity is formed inside the second tube (58). A sealing ring (59) is fitted at the end of the second tube (58). The end of the second tube (58) is inserted into the insertion cavity. The sealing ring (59) seals between the first tube (57) and the second tube (58).

8. The high-frequency electrosurgical unit for preventing water leakage according to claim 2, characterized in that, The outlet of the second cavity is located on the side of the sealing member (42) away from the outlet of the first cavity (51). There is a gap between the sealing member (42) and the wall of the second cavity, and there is a gap between the elastic member (41) and the wall of the second cavity.

9. The high-frequency electrosurgical unit for preventing water leakage according to claim 1, characterized in that, The sealing element (42) is spherical, conical, frustum-shaped or columnar.

10. The high-frequency electrosurgical unit for preventing water leakage according to claim 9, characterized in that, The sealing element (42) is spherical, and the outlet of the first cavity (51) has an abutment surface that matches the shape of the sealing element (42); or, The sealing element (42) is conical, and the outlet of the first cavity (51) has an abutment surface that matches the curved surface of the sealing element (42); or, The sealing element (42) is frustoconical, and the outlet of the first cavity (51) has an abutment surface that matches the curved surface of the sealing element (42).

Images