Surgical electrotome with distraction structure

Abstract

The invention relates to the field of surgical electrotomes, in particular to a surgical electrotome with a distraction structure, which comprises an electrotome body formed by sequentially connecting a handle, an electrode stem and an electrode tip, and further comprises a positioning sleeve fixedly sleeved on the surface of the electrode stem, distraction walls are symmetrically hinged to two sides of the positioning sleeve, and the distraction walls are connected with the positioning sleeve. A first hinge rod is hinged to the outer wall of the end, close to the positioning sleeve, of the distraction wall. The adjustable distraction wall is directly integrated on the electrotome, the distraction angle can be adjusted by sliding the lantern ring, and continuous and stable distraction of an incision is achieved while the electrotome is operated. By means of the integrated design, the number of times of instrument replacement is remarkably reduced, the operation time is shortened, the electrotome is particularly suitable for operation scenes (such as anorectum, thyroid gland and mammary gland) with deep portions, narrow cavities or limited spaces, and due to the operation convenience and time saving, the tiny loss of the electrotome in the moving flexibility caused by an integrated distraction structure is far beyond the small loss of the electrotome in the moving flexibility caused by the integrated distraction structure.

Description

Technical Field

[0001] This invention relates to the field of surgical electrosurgical units, and more particularly to a surgical electrosurgical unit with a spreading structure. Background Technology

[0002] Electrosurgical instruments, especially electrosurgical scalpels, have become indispensable tools in modern surgery, used for tissue cutting, coagulation, and hemostasis. Traditional electrosurgical scalpels typically consist of a handle, electrode rod, and electrode tip. During operation, the surgeon controls the electrode tip to contact the tissue via the handle, utilizing high-frequency current to generate a thermal effect to achieve the surgical objective.

[0003] However, in surgeries involving deep, narrow cavities or limited space (such as anorectal, thyroid, breast, and some laparoscopic-assisted incision surgeries), surgeons often need to retract and expose the tissues surrounding the incision or cavity while performing electrocautery or electrocoagulation to maintain a clear surgical field. The current mainstream practice is to use separate retractors or hooks to open the tissues, which necessitates frequent switching between the electrocautery knife and retractor instruments during the procedure. This not only complicates the procedure and prolongs the operation time but may also affect the continuity and precision of the surgery due to the alternation of instruments. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a surgical electrosurgical unit with a spreading structure to solve the technical problems in the prior art.

[0005] To achieve the above objectives, the present invention provides a surgical electrosurgical unit with a spreading structure, comprising an electrosurgical body, wherein the electrosurgical body is composed of a handle, an electrode rod, and an electrode head connected in sequence, and further comprising: A positioning sleeve is fixedly sleeved on the surface of the electrode rod. The two sides of the positioning sleeve are symmetrically hinged with expansion walls, and a first hinge rod is hinged to the outer wall of the expansion wall near the positioning sleeve. A collar is movably fitted onto the outer periphery of the handle, and the end of the first hinge rod away from the connecting ear is hinged to the side wall of the collar; At least one set of adjustment components disposed between the handle surface and the collar for adjusting the opening and closing angle of the two symmetrically arranged support walls.

[0006] Preferably, the adjustment assembly is provided in two sets, and the two sets of adjustment assemblies are symmetrically arranged on both sides of the collar along the circumference of the collar.

[0007] Preferably, the adjustment component includes: A guide groove is formed on the outer peripheral surface of the handle, and a slider is slidably fitted on one side of the inner wall of the guide groove; A movable cavity is provided at the end of the slider facing the guide groove, and the movable cavity is connected to the guide groove; A pressure bar that extends through the surface of the collar, with one end of the pressure bar passing through the collar and the slider in sequence and extending into the interior of the movable cavity; A spring is sleeved on the outer peripheral wall of the pressure rod, and the two ends of the spring are respectively fixedly connected to the outer wall of the collar and the end wall of the pressure rod away from the movable cavity; A locking block is fixed to one end of the pressure rod extending into the movable cavity, and the end of the locking block away from the guide groove abuts against the inner wall of the movable cavity; Multiple limiting blocks are fixed at equal intervals to the inner wall of the guide groove and away from the sliding side of the slider. The locking block is selectively inserted between two adjacent limiting blocks.

[0008] Preferably, the limiting block has guide chamfers on both sides of the end away from the spring, and the locking block has arc-shaped surfaces on both sides of the end near the spring that are adapted to the guide chamfers.

[0009] Preferably, the positioning sleeve has an annular chamber inside, which is used for the circulation of surgical smoke; The positioning sleeve has multiple suction holes equidistantly spaced along the circumference on the side near the electrode head. One end of each suction hole is connected to the annular cavity, and the other end faces the electrode head. A flexible negative pressure tube is detachably connected to the side of the positioning sleeve away from the electrode head. The flexible negative pressure tube communicates with the annular chamber, and the other end of the flexible negative pressure tube is used to connect to an external operating room suction device.

[0010] Preferably, the inner side of the expanding wall is provided as an arc-shaped surface, and the arc-shaped surface of the inner wall of the expanding wall and the outer peripheral surface of the electrode rod form a V-shaped flue gas guide groove. The end of the support wall near the electrode head is designed as a rounded transition surface.

[0011] Preferably, both the positioning sleeve and the expansion wall are made of medical-grade 316L stainless steel.

[0012] Preferred options also include: At least one pair of arc-shaped rolling grooves are formed on the outer wall of the expansion wall, the arc-shaped rolling grooves extend along the axis of the electric knife and are provided through one end away from the electrode head; The convex rib installed inside the arc-shaped rolling groove is rotated, and the protrusion on one side of the convex rib extends to the outside of the arc-shaped rolling groove; A limiting groove is formed circumferentially on the outer wall of the expanding wall and away from the electrode head. A limiting strip is installed inside the limiting groove to restrict the movement of the protrusion. The surface of the limiting strip is symmetrically provided with grooves. A fixing bolt is threaded in the groove, and one end of the fixing bolt is threaded inside the limiting groove.

[0013] Preferably, both ends of the protrusion are provided with arc-shaped chamfers, and the arc-shaped chamfers are smooth transition structures.

[0014] Preferably, the depth of the limiting groove is greater than the thickness of the limiting strip.

[0015] The beneficial effects of this invention are as follows: Using a surgical electrosurgical unit with a retraction structure, the adjustable retraction wall is directly integrated into the electrosurgical unit, and the retraction angle can be adjusted via a sliding collar. This allows for continuous and stable retraction of the incision while the electrosurgical unit is being operated on. This integrated design significantly reduces the number of instrument changes and shortens surgical time. It is particularly suitable for surgical scenarios involving deep, narrow cavities, or limited space (such as anorectal, thyroid, and breast surgeries). The operational convenience and time savings it brings far outweigh the slight loss in the electrosurgical unit's movement flexibility due to the integrated retraction structure. When it is necessary to advance deeper or move laterally to expand the exposure area, the unlocked retraction wall can move synchronously with the electrosurgical unit, achieving "dynamic following" tissue retraction, automatically maintaining a clear surgical field, and avoiding loss of vision and repeated tissue traction caused by repositioning the retractor.

[0016] Through the annular chamber inside the positioning sleeve, the inclined suction port, and the external negative pressure suction line, smoke can be drawn out immediately in the working area of ​​the electrode head, preventing smoke diffusion from affecting the field of vision and the health of medical staff. The V-shaped guide groove formed on the inner side of the expanded wall further guides the smoke to the suction port, improving suction efficiency. Thus, while completing tissue expansion, the surgical environment is improved simultaneously, reducing intraoperative smoke interference and further enhancing the continuity and safety of the operation.

[0017] Furthermore, the inner side of the support wall is curved and forms a guide channel with the electrode rod, with a rounded transition at the front end to avoid tissue damage; the rolling ridges on the outer side can convert sliding friction into rolling friction, further reducing tissue traction damage. The detachable design of the ridges facilitates thorough cleaning and disinfection, meeting the high hygiene standards required for surgical instruments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is the left view of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B; Figure 5This is a partial structural cross-sectional view of the collar, slider, and locking block in this invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C; Figure 7 This is a schematic diagram of an isomorphic explosion in the invention.

[0020] The diagram is marked as follows: 1. Electrosurgical unit body; 2. Positioning sleeve; 3. Spreading wall; 4. First hinge rod; 5. Collar; 6. Guide groove; 7. Slider; 8. Movable cavity; 9. Pressure rod; 10. Spring; 11. Locking block; 12. Limiting block; 13. Suction hole; 14. Flexible negative pressure tube; 15. Arc-shaped rolling groove; 16. Protrusion; 17. Limiting groove; 18. Limiting strip; 19. Fixing bolt. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] In a first aspect, the present invention provides a surgical electrosurgical unit with a spreading structure, such as... Figure 1-7 As shown, the device includes an electrosurgical body 1, which is composed of a handle, an electrode rod, and an electrode head connected in sequence. It also includes: A positioning sleeve 2 is fixedly sleeved on the surface of the electrode rod. The positioning sleeve 2 is symmetrically fixed to the insulating sleeve on the outer wall of the electrode rod by two M3 medical fastening screws. The two sides of the positioning sleeve 2 are symmetrically hinged with a support wall 3, and the outer wall of the support wall 3 near the positioning sleeve 2 is hinged with a first hinge rod 4. It should be added that a U-shaped frame is fixed on both sides of the positioning sleeve 2. A hinge shaft is fixedly installed on the U-shaped frame by bolts. The end of the support wall 3 is rotatably assembled on the hinge shaft. The outer wall of the support wall 3 near the positioning sleeve 2 is integrally formed with a connecting ear. The connecting ear is at a 90° angle with the support wall 3. The support wall 3 is hinged to the first hinge rod 4 through the connecting ear to facilitate disassembly and sterilization.

[0024] The collar 5 is movably fitted onto the outer circumference of the handle. The end of the first hinge rod 4 away from the connecting ear is hinged to the side wall of the collar 5. A U-shaped connecting ear is integrally formed on the side wall of the collar 5 corresponding to the position of the first hinge rod 4. The connecting ear is 3mm thick and has a hinge hole with a diameter of 2mm. The end of the first hinge rod 4 away from the spreading wall 3 is hinged to the connecting ear through a medical stainless steel hinge shaft with a diameter of 2mm. The two ends of the hinge shaft are limited by snap rings to ensure that the hinge can rotate flexibly and there is no risk of falling off.

[0025] At least one set of adjustment components is provided between the handle surface and the collar 5 for adjusting the opening and closing angles of the two symmetrically arranged support walls 3.

[0026] In its natural state, the adjustment component locks the collar 5 in the desired position. During surgery, the operator presses the adjustment component to release the collar 5, allowing it to slide freely along the guide groove 6 to the target position. The movement of the collar 5 causes the first hinge rod 4 to push or pull the two expansion walls 3 outward and inward, adjusting the opening angle of the expansion walls 3. This allows for gentle expansion of the tissues surrounding the incision or cavity to varying degrees according to surgical needs, resulting in a clear surgical field. This integrated design significantly reduces instrument changes and shortens surgical time, making it particularly suitable for deep, narrow cavities, or space-constrained surgical scenarios (such as anorectal, thyroid, and breast surgeries). The operational convenience and time savings it brings far outweigh the slight loss in the flexibility of the electrocautery due to the integrated expansion structure.

[0027] In this embodiment, two sets of adjustment components are provided, and the two sets of adjustment components are symmetrically arranged on both sides of the collar 5 along the circumference of the collar 5. This achieves smooth adjustment of the opening and closing angle of the support wall 3.

[0028] In this embodiment: the adjustment component includes: A guide groove 6 is formed on the outer periphery of the handle, and a slider 7 is slidably fitted on one side of the inner wall of the guide groove 6; A movable cavity 8 is provided at the end of the slider 7 facing the guide groove 6, and the movable cavity 8 is connected to the guide groove 6; The pressure rod 9 is active and passes through the surface of the collar 5. One end of the pressure rod 9 passes through the collar 5 and the slider 7 in sequence and extends into the interior of the movable cavity 8. A spring 10 is sleeved on the outer peripheral wall of the pressure rod 9. The two ends of the spring 10 are respectively fixedly connected to the outer wall of the collar 5 and the end wall of the pressure rod 9 away from the movable cavity 8; it is used to provide the restoring elastic force of the pressure rod 9.

[0029] A locking block 11 is fixed to one end of the pressure rod 9 that extends into the movable cavity 8. The end of the locking block 11 away from the guide groove 6 abuts against the inner wall of the movable cavity 8. Multiple limiting blocks 12 are fixed at equal intervals to the inner wall of the guide groove 6 and away from the sliding side of the slider 7. Locking blocks 11 are selectively inserted between two adjacent limiting blocks 12 to achieve position locking of the collar 5. The guide groove 6 is opened along the handle axis, with a length of 80mm and a T-shaped cross-section (lateral width 8mm, longitudinal depth 6mm). The slider 7 and the guide groove 6 are clearance-fitted with a clearance of 0.1-0.2mm. The limiting blocks 12 are cuboid structures with a height of 4mm and a width of 3mm. The spacing between adjacent limiting blocks is 5mm, and 15 sets are evenly arranged along the length of the guide groove 6 to ensure that the opening angle of the support wall 3 can be adjusted from 0-60°. In addition, the spring 10 is a medical stainless steel compression spring with an elastic coefficient of 2N / mm, a free length of 20mm, a wire diameter of 1.2mm, and an outer diameter of 5mm. In the natural state of the spring 10, the locking blocks 11 are fully engaged between adjacent limiting blocks 12 to ensure that the collar 5 does not slide spontaneously.

[0030] When the angle of the support wall 3 needs to be adjusted, the operator presses the ends of the two pressure rods 9 simultaneously with their thumb and forefinger to overcome the spring force of the spring 10, driving the locking block 11 to fully retract into the movable cavity 8, thus disengaging it from the limiting block 12. At this time, the collar 5 can be freely slid along the guide groove 6 to the target position. After releasing the pressure rods 9, the spring 10 pushes the locking block 11 to reset, causing it to engage with the new gap of the limiting block 12, thus achieving relocking.

[0031] In this embodiment, guide chamfers are provided on both sides of the limiting block 12 away from the spring 10, and arc-shaped surfaces adapted to the guide chamfers are provided on both sides of the locking block 11 near the spring 10. The cooperation between the guide chamfers of the limiting block 12 and the arc-shaped surfaces of the locking block 11 reduces the resistance between the locking block 11 and the limiting block 12.

[0032] In this embodiment: the positioning sleeve 2 has an annular chamber inside, which is used for the circulation of surgical smoke; The positioning sleeve 2 has multiple suction holes 13 evenly spaced along the circumference on the side near the electrode head. One end of the suction hole 13 is connected to the annular cavity, and the other end faces the electrode head. The inner diameter of the annular cavity inside the positioning sleeve 2 is 12mm, the outer diameter is 16mm, and the height is 10mm. There are 6-8 suction holes with a diameter of 2mm, which are evenly distributed along the circumference of the positioning sleeve 2 near the electrode head. The suction holes are tilted at 15° towards the electrode head to ensure that the suction range covers the working area of ​​the electrode head.

[0033] A flexible negative pressure tube 14 is detachably connected to the side of the positioning sleeve 2 away from the electrode head. The flexible negative pressure tube 14 communicates with the annular chamber, and the other end of the flexible negative pressure tube 14 is used to connect to an external operating room suction device. The side of the positioning sleeve 2 away from the electrode head is provided with an external threaded interface (specification M8×1), and one end of the flexible negative pressure tube 14 is provided with a matching internal threaded connector. The connector and the positioning sleeve interface are sealed with a medical silicone rubber sealing ring. The flexible negative pressure tube 14 is made of food-grade silicone material, with an inner diameter of 8mm and a length of 1.5m. It can be adapted to the interface of the operating room suction device. By connecting the other end of the flexible negative pressure tube 14 to a conventional operating room suction device, most of the smoke can be immediately removed, realizing the source suction of surgical smoke.

[0034] In this embodiment: the inner side of the support wall 3 is set as an arc-shaped surface, and the arc-shaped surface of the inner wall of the support wall 3 and the outer peripheral surface of the electrode rod form a V-shaped flue gas guide groove. During electrocautery or electrocoagulation, the high-temperature fumes generated by the electrosurgical unit diffuse upwards due to thermal convection. The fumes are first collected by the V-shaped guide grooves inside the expanded wall 3 and guided to the suction port 13 area at the front end of the positioning sleeve 2. Then, they are drawn into the annular chamber 20 by strong negative pressure through the suction port 13 and discharged through the flexible negative pressure tube 14. This simultaneously improves the surgical environment, reduces intraoperative smoke interference, and further enhances the continuity and safety of the procedure while simultaneously expanding the tissue.

[0035] The end of the support wall 3 near the electrode head is designed with a rounded transition surface. This is to avoid scratching the tissue when spreading the surrounding tissue at the cutting site.

[0036] In this embodiment: both the positioning sleeve 2 and the expansion wall 3 are made of medical grade 316L stainless steel, and the outer surfaces of the positioning sleeve 2 and the expansion wall 3 are coated with an insulating layer made of biocompatible insulating material. The insulating layer is resistant to disinfection and sterilization, and the insulating layer is preferably a ceramic coating.

[0037] In this embodiment, it also includes: At least one pair of arc-shaped rolling grooves 15 are formed on the outer wall of the support wall 3. The arc-shaped rolling grooves 15 extend along the direction of the electric knife axis and are provided through one end away from the electrode head. The convex strip 16, which is installed inside the arc-shaped rolling groove 15, is rotated, and the protrusion on one side of the convex strip 16 extends to the outside of the arc-shaped rolling groove 15. The convex strip 16 is a cylinder and is supported by medical-grade 316L stainless steel, which is used to reduce the contact friction between the support wall 3 and the tissue.

[0038] A limiting groove 17 is circumferentially opened on the outer wall of the expanding wall 3 and away from the electrode head. A limiting strip 18 is installed inside the limiting groove 17 to restrict the movement of the protrusion 16. This is used to prevent the protrusion 16 from disengaging from the through end of the arc-shaped rolling groove 15. The surface of the limiting strip 18 is symmetrically provided with grooves. A fixing bolt 19 is threaded in the groove. One end of the fixing bolt 19 is threaded inside the limiting groove 17 to fix the position of the limiting strip 18. The protrusion 16 can be disassembled and cleaned by installing the fixing bolt 19.

[0039] This structure allows the protrusion 16 to roll as the support wall 3 moves within the tissue, changing sliding friction into rolling friction, significantly reducing the risk of tissue damage. Furthermore, the protrusion 16 can be easily removed for cleaning and disinfection, meeting the high hygiene standards required for surgical instruments.

[0040] In this embodiment, both ends of the protrusion 16 are provided with arc-shaped chamfers, which are smooth transition structures. This prevents the protrusion 16 from scratching the tissue or stretching the wall 3 when it moves.

[0041] In this embodiment, the depth of the limiting groove 17 is greater than the thickness of the limiting strip 18. This ensures that the surface of the limiting strip 18 does not protrude from the outer wall of the supporting wall 3 after assembly, preventing interference with the opening and closing action of the supporting wall 3 and its contact with tissues.

[0042] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0043] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A surgical electrosurgical unit with a spreading structure, comprising an electrosurgical body (1), wherein the electrosurgical body (1) is composed of a handle, an electrode rod, and an electrode head connected in sequence, characterized in that, Also includes: A positioning sleeve (2) is fixedly sleeved on the surface of the electrode rod. The two sides of the positioning sleeve (2) are symmetrically hinged with a support wall (3), and a first hinge rod (4) is hinged to the outer wall of the support wall (3) near the positioning sleeve (2). A collar (5) is movably fitted onto the outer circumference of the handle, and the end of the first hinge rod (4) away from the connecting ear is hinged to the side wall of the collar (5); At least one set of adjustment components is provided between the handle surface and the collar (5) for adjusting the opening and closing angle of the two symmetrically arranged support walls (3).

2. The surgical electrosurgical unit with a spreading structure according to claim 1, characterized in that, The adjustment components are provided in two sets, and the two sets of adjustment components are symmetrically arranged on both sides of the collar (5) along the circumference.

3. A surgical electrosurgical unit with a spreading structure according to claim 1 or 2, characterized in that, The adjustment component includes: A guide groove (6) is formed on the outer peripheral surface of the handle, and a slider (7) is slidably fitted on one side of the inner wall of the guide groove (6). An active cavity (8) is provided at one end of the slider (7) facing the guide groove (6), and the active cavity (8) is connected to the guide groove (6); A pressure rod (9) is inserted through the surface of the collar (5), one end of which passes through the collar (5) and the slider (7) and extends into the interior of the movable cavity (8); A spring (10) is sleeved on the outer peripheral wall of the pressure rod (9). The two ends of the spring (10) are respectively fixedly connected to the outer wall of the collar (5) and the end wall of the pressure rod (9) away from the movable cavity (8). A locking block (11) is fixed to one end of the pressure rod (9) extending into the movable cavity (8), and the end of the locking block (11) away from the guide groove (6) abuts against the inner wall of the movable cavity (8); Multiple limiting blocks (12) are fixed at equal intervals to the inner wall of the guide groove (6) and away from the sliding side of the slider (7). The locking block (11) is selectively inserted between two adjacent limiting blocks (12).

4. The surgical electrosurgical unit with a spreading structure according to claim 3, characterized in that, The limiting block (12) has guide chamfers on both sides of the end away from the spring (10), and the locking block (11) has arc-shaped surfaces on both sides of the end near the spring (10) that are adapted to the guide chamfers.

5. The surgical electrosurgical unit with a spreading structure according to claim 3, characterized in that, The positioning sleeve (2) has an annular chamber inside, which is used for the circulation of surgical smoke; The positioning sleeve (2) has multiple suction holes (13) equidistantly spaced along the circumferential direction on the side near the electrode head. One end of the suction hole (13) is connected to the annular cavity, and the other end faces the electrode head. The positioning sleeve (2) is detachably connected to a flexible negative pressure tube (14) on the side away from the electrode head. The flexible negative pressure tube (14) is connected to the annular chamber, and the other end of the flexible negative pressure tube (14) is used to connect to an external operating room suction device.

6. The surgical electrosurgical unit with a spreading structure according to claim 5, characterized in that, The inner side of the support wall (3) is set as an arc surface, and the arc surface of the inner wall of the support wall (3) and the outer peripheral surface of the electrode rod form a V-shaped flue gas guide groove. The end of the support wall (3) near the electrode head is set as a rounded transition surface.

7. A surgical electrosurgical unit with a spreading structure according to claim 6, characterized in that, The positioning sleeve (2) and the expansion wall (3) are both made of medical grade 316L stainless steel.

8. A surgical electrosurgical unit with a spreading structure according to claim 6, characterized in that, Also includes: At least one pair of arc-shaped rolling grooves (15) are formed on the outer wall of the support wall (3), the arc-shaped rolling grooves (15) extend along the direction of the electric knife axis and are provided through one end away from the electrode head; Rotate the protrusion (16) installed inside the arc-shaped rolling groove (15), and the protrusion on one side of the protrusion (16) extends to the outside of the arc-shaped rolling groove (15); A limiting groove (17) is circumferentially opened on the outer wall of the expanding wall (3) and away from the electrode head. The limiting groove (17) is equipped with a limiting strip (18) to restrict the movement of the protrusion (16). The surface of the limiting strip (18) is symmetrically provided with grooves. A fixing bolt (19) is threaded in the groove, and one end of the fixing bolt (19) is threaded in the limiting groove (17).

9. A surgical electrosurgical unit with a spreading structure according to claim 8, characterized in that, Both ends of the protrusion (16) are provided with arc-shaped chamfers, and the arc-shaped chamfers are a smooth transition structure.

10. A surgical electrosurgical unit with a spreading structure according to claim 9, characterized in that, The depth of the limiting groove (17) is greater than the thickness of the limiting strip (18).

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