Multifunctional electric knife pen with replaceable knife head

Abstract

The invention discloses a multifunctional electric knife pen with a replaceable knife head. The multifunctional electric knife pen comprises a conductive sleeve, a circuit board, a conductive elastic piece, a variable-diameter sleeve, the multifunctional knife head, a limiting ring, a pen body and a conductive piece. Through the design of the reducing sleeve and the limiting ring, the scalpel head with different functions can be replaced according to surgical requirements, the scalpel is suitable for various surgical scenes, the frequency of instrument replacement in the surgery is reduced, smoke can be discharged through the conductive sleeve when the scalpel head with the smoke suction function is replaced through the conductive sleeve, surgical smoke is effectively removed, the surgical field of view is improved, and the surgical efficiency is improved. And meanwhile, according to the close fit of the conductive sleeve, the conductive elastic sheet and the conductive piece, the stability and reliability of current transmission are ensured, unforeseen circumstances caused by unstable current in an operation are avoided while the detachability is ensured, and the operation safety is improved.

Description

Technical Field

[0001] The present invention belongs to the field of electrosurgical knives, and particularly relates to a multifunctional electrosurgical pen with replaceable knife heads. Background Art

[0002] An electrosurgical pen is a medical device widely used in surgical operations, which realizes functions such as tissue cutting, hemostasis, and coagulation through high-frequency current. However, when using an electrosurgical pen in surgery, a large amount of surgical smoke will be generated. These smokes not only block the surgical field of view but may also contain harmful substances, posing a potential threat to the health of medical staff and patients. To solve this problem, a smoking electrode knife (integrated with a smoke suction function) has been introduced into the operation, which can effectively remove surgical smoke and improve the surgical environment.

[0003] Currently, there are various types of electrode knives on the market, mainly including smoking electrode knives, non-smoking electrode knives, and electrode knives with specific functions (such as fine cutting knives, hemostatic knives, coagulation knives, etc.). Smoking electrode knives are suitable for complex surgeries with a lot of smoke, while non-smoking electrode knives are suitable for simple surgeries. In addition, different functional electrode knives can meet the diverse requirements for cutting accuracy, hemostatic effect, and coagulation speed during the operation.

[0004] However, there are many inconveniences in replacing different types of electrode knives in existing electrosurgical pens. For example, replacing the electrode knife requires disassembling the entire device, which is cumbersome and time-consuming, seriously affecting the surgical efficiency. In addition, the smoking function of some electrosurgical pens relies on external devices, increasing the complexity of the equipment and the operation difficulty in the operating room. At the same time, the types of electrode knives in existing electrosurgical pens are limited and cannot meet the diverse functional requirements in complex surgeries.

[0005] During actual surgeries, doctors may need to quickly switch to use different types of electrode knives according to the surgical process. For example, using a non-smoking electrode knife for simple operations at the initial stage of the surgery and switching to a smoking electrode knife in the stage with more smoke; or replacing it with a fine cutting knife when fine cutting is required. However, the existing technology cannot meet this requirement for quick switching, resulting in a reduction in surgical efficiency and even potentially affecting the surgical effect.

[0006] To solve the above problems, there is an urgent need for a multifunctional electrosurgical pen that supports quick replacement of different types of electrode knives (including smoking and non-smoking electrode knives), can achieve efficient and convenient switching of electrode knives, and integrate the smoking function to simplify the surgical operation process. Summary of the Invention

[0007] The purpose of the present invention is to provide a multifunctional electrosurgical pen with replaceable knife heads to solve the problems in the background art.

[0008] The above technical purpose of the present invention is achieved through the following technical solutions: A multi-functional replaceable cutter head electrocautery pen, comprising a conductive sleeve, a circuit board, a conductive elastic sheet, a reducing sleeve, a multi-functional cutter head, a limiting ring, a pen body, and a conductive member. The limiting ring is arranged inside the pen body and at the front of the pen body. The reducing sleeve is detachably arranged inside the limiting ring and extends to the outside of the pen body. The multi-functional cutter head is arranged inside the reducing sleeve. The circuit board is arranged inside the pen body and above the conductive sleeve. The conductive elastic sheet is arranged between the circuit board and the conductive sleeve. The conductive elastic sheet closely adheres to the outer side wall of the conductive sleeve. The conductive member is arranged inside the conductive sleeve and closely fits with the inner side wall of the conductive sleeve. Through the reducing sleeve, the pen body remains unchanged during the operation. When replacing different types of cutter heads, the reducing sleeve also changes accordingly to adapt to cutter heads of different sizes.

[0009] Through the design of the reducing sleeve and the limiting ring, the present invention can replace cutter heads with different functions according to the surgical needs, adapt to various surgical scenarios, and reduce the frequency of replacing instruments during the operation. When replacing the cutter head with a smoking function, the smoke can be discharged through the conductive sleeve, effectively removing the surgical smoke, improving the surgical field of view, protecting the health of medical staff and patients. At the same time, according to the close cooperation of the conductive sleeve, the conductive elastic sheet and the conductive member, the stability and reliability of current transmission are ensured, and accidents caused by unstable current during the operation are avoided while ensuring detachable, improving the surgical safety.

[0010] The multi-functional cutter head is a non-retractable electrode, and the conductive member is a conductive sheet. An arc-shaped portion arched upward is formed at the rear end of the conductive sheet. The top of the arc-shaped portion closely fits with the inner side wall of the conductive sleeve.

[0011] Through the close fit of the arc-shaped portion with the inner side wall of the conductive sleeve and the conductive elastic sheet closely adhering to the outer side wall of the conductive sleeve, when replacing with a common non-smoking sleeve, there is no need to use a conductive limiting block like that of a retractable electrode, and the cutter head does not need to extend into the conductive sleeve, reducing the cost while ensuring the stable performance of current transmission, which is beneficial to the long-term promotion of the product.

[0012] Preferably, a first card slot for inserting the conductive sheet is formed at the rear end of the reducing sleeve. An elastic card is formed on the conductive sheet. One end of the elastic card is connected to the conductive sheet, and the other end is a free end. A second card slot cooperating with the elastic card is formed on the reducing sleeve.

[0013] In the present invention, the conductive sheet is clamped into the reducing sleeve through the first card slot, and the elastic card is clamped into the second card slot to complete the fixation of the conductive sheet and the reducing sleeve.

[0014] The multi-functional cutter head is a retractable electrode, the conductive member is a conductive limiting block, the retractable electrode is slidably arranged inside the conductive sleeve, the conductive limiting block is arranged at the rear end of the retractable electrode, the conductive limiting block is always in close contact with the inner side wall of the conductive sleeve during the sliding process, and an insulating sleeve is arranged on the part of the retractable electrode located in the conductive sleeve.

[0015] In the present invention, through the conductive limiting block, when the retractable electrode slides in the conductive sleeve, the stable transmission of current is always maintained.

[0016] Preferably, the conductive limiting block includes a conductive arc-shaped elastic rod and a fixing ring. The fixing ring is fixed at the rear end of the retractable electrode. An annular groove is formed on the side wall of the fixing ring. A plurality of the conductive arc-shaped elastic rods are circumferentially arrayed on the annular groove. An opening is formed between the two conductive arc-shaped elastic rods at the starting end and the ending end. The conductive arc-shaped elastic rod is an elastic metal sheet.

[0017] In the present invention, through the conductive arc-shaped elastic rod, when the retractable electrode slides, the conductive arc-shaped elastic rod is pressed against the inner wall of the conductive sleeve, which can not only keep a good electrical connection between the conductive sleeve and the electrode, but also firmly position the electrode at the current telescopic length position.

[0018] The inner wall of the front part of the limiting ring is a horn-shaped groove that gradually narrows from the front end to the rear end. The limiting ring has a certain elasticity. An annular limiting groove for limiting the conductive sleeve is formed at the rear part of the limiting ring.

[0019] In the present invention, through the horn-shaped groove, the reducing sleeve is convenient to be inserted into the pen body, and at the same time, through the gradually narrowing horn-shaped groove, the reducing sleeve deforms after being inserted, and the reducing sleeve is firmly locked, so as to carry out detachable connection.

[0020] The retractable electrode is a four-in-one retractable electrode. The four-in-one retractable electrode includes a functional tube, an inclined mouth tube, a knife tongue electrode tube, a friction damping elastic sheet, and a connecting tube. The functional tube is arranged inside the conductive sleeve. The conductive limiting block is sleeved and fixed on the outer side wall of the functional tube. The knife tongue electrode tube is arranged inside the functional tube. The connecting tube is arranged between the knife tongue electrode tube and the functional tube. The inclined mouth tube is fixedly connected to the front end of the connecting tube and is located outside the knife tongue electrode tube. The friction damping elastic sheet is arranged between the functional tube and the connecting tube.

[0021] In the present invention, by pulling the inclined mouth tube to drive the connection of the connecting tube, the inclined mouth tube can hide the knife tongue electrode tube and be used as an inclined mouth tube, which is convenient for the scraping function during the operation. When the inclined mouth tube retracts, the knife tongue is exposed again, and the electric cutting, electric coagulation and separation functions can be carried out, realizing four-in-one. It can also be adjusted to a suitable position to use the inclined mouth tube as a smoking tube, realizing multiple functions and reducing the number of times of replacing the cutter head.

[0022] In the present invention, a friction damping elastic piece is used to increase the friction force between the connecting pipe and the functional pipe, playing a damping role so that after the telescopic adjustment to a proper position, the pipe will not move.

[0023] Two waist-shaped sliding grooves are formed in the part of the tongue electrode pipe located in the connecting pipe. The two waist-shaped sliding grooves are symmetrically arranged. Convex points are formed on the friction damping elastic piece. Through holes are formed in the connecting pipe at positions corresponding to the convex points. The convex points pass through the through holes and are arranged in the waist-shaped sliding grooves. The tongue is located at the tip position of the orifice of the bevel pipe.

[0024] In the present invention, through the arrangement of the waist-shaped sliding grooves and the convex points, the telescopic stroke is limited to prevent the connecting pipe from falling off. At the same time, when the bevel pipe rotates, the tongue can also rotate accordingly, ensuring that the tongue is always located at the tip position of the orifice of the bevel pipe and guaranteeing the surgical vision.

[0025] The functional pipe, the connecting pipe, the tongue electrode pipe, and the bevel pipe are all made of conductive materials. An insulating material is provided on the outer side wall of the bevel pipe to facilitate manual telescoping through the bevel pipe.

[0026] A clamping mechanism is further provided at the rear end of the pen body. The clamping mechanism includes a fixed disk, a rotating disk, a rotating rod, a clamping block, and a fixed cover. The fixed disk is fixed at the end of the pen body. A circulation hole is formed in the middle of the fixed disk. A fixed seat is formed around the circulation hole. The rotating disk is rotatably arranged on the top of the fixed seat and can be connected through a bearing. The fixed cover is sleeved outside the fixed seat and the rotating disk and is fixedly connected with the fixed disk. Large bevel gear teeth are provided at the bottom of the rotating disk. A planar thread is provided at the top of the rotating disk. A conical tooth meshing with the large bevel gear teeth is provided on the rotating rod. The end of the rotating rod penetrates through the fixed cover and extends outside the pen body. More than three radial sliding grooves are provided at the top of the fixed cover. The clamping block is slidably arranged in the radial sliding groove. A clamping block limiting groove matched with the planar thread is formed at the bottom of the clamping block.

[0027] In the present invention, through the clamping mechanism, the functional pipe passes through the conductive sleeve and is clamped in the clamping mechanism to prevent the movement of the functional pipe.

[0028] In the present invention, by rotating the rotating rod, through the cooperation of the large bevel gear teeth and the conical teeth, the rotating disk rotates, and the planar thread drives the three clamping blocks to move simultaneously, realizing the clamping or loosening of the functional pipe.

[0029] Preferably, the pen body is divided into two upper and lower parts. The front end of the conductive sleeve is in the shape of a horn mechanism, so that it can be stuck in the limit ring and will not move. The two-part structure facilitates installation. The end of the pen body is a conical opening with a gradually narrowing opening, and a spiral thread is formed on the conical opening. Through the conical opening, the end of the pen body can be replaced with different sleeves according to different situations. When smoking is not required, a closed sleeve is replaced. When smoking is required, it is replaced with a smoking pipe.

[0030] In summary, the beneficial effects of the present invention are as follows: 1. Through the design of the variable-diameter sleeve and the limit ring, the present invention can replace the tool head with different functions according to the surgical needs, adapt to various surgical scenarios, reduce the frequency of replacing instruments during the operation. When replacing the tool head with a smoking function through the conductive sleeve, the smoke can be discharged through the conductive sleeve, effectively removing the surgical smoke, improving the surgical field of view, protecting the health of medical staff and patients. At the same time, according to the close cooperation of the conductive sleeve, the conductive elastic piece and the conductive part, the stability and reliability of the current transmission are ensured, and the detachable property is guaranteed while avoiding accidents caused by unstable current during the operation, improving the surgical safety. 2. By closely fitting the arc part with the inner wall of the conductive sleeve and the conductive elastic piece closely adhering to the outer wall of the conductive sleeve, when replacing it with a common sleeve that does not require smoking, there is no need to use a conductive limit block similar to the retractable electrode, and the tool head does not need to extend into the conductive sleeve, reducing the cost while ensuring the stable performance of current transmission, which is conducive to the long-term promotion of the product. 3. By pulling out the inclined mouth tube to drive the connection of the connecting tube, the inclined mouth tube can hide the tongue electrode tube and be used as an inclined mouth tube, facilitating the scraping function during the operation. When the inclined mouth tube retracts, the tongue is exposed, enabling electrocision, electrocoagulation, and separation functions, achieving four-in-one. It can also be adjusted to a suitable position to use the inclined mouth tube as a smoking tube, realizing multiple functions and reducing the number of tool head replacements. 4. The present invention increases the friction between the connecting tube and the functional tube through the friction damping elastic piece, playing a damping role, so that after being telescopically adjusted to a suitable position, it will not move. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the overall schematic diagram of the multi-functional tool head of the electrosurgical pen with a non-retractable electrode of the present invention; Figure 2 is the cross-sectional schematic diagram of the present invention when replaced with a non-retractable electrode; Figure 3 is the present invention Figure 2 magnified schematic diagram of part A; Figure 4 is the schematic diagram of the variable-diameter sleeve and the conductive sheet of the non-retractable electrode of the present invention; Figure 5It is a schematic diagram of the limit ring of the present invention; Figure 6 It is a cross-sectional schematic diagram of the present invention when replaced with a telescopic electrode; Figure 7 It is the present invention Figure 6 An enlarged schematic diagram of part B of the present invention; Figure 8 It is a schematic diagram of the telescopic electrode of the present invention; Figure 9 It is a schematic diagram of the four-in-one telescopic electrode of the present invention; Figure 10 It is a cross-sectional schematic diagram of the four-in-one telescopic electrode of the present invention; Figure 11 It is the present invention Figure 10 An enlarged schematic diagram of part C of the present invention; Figure 12 It is the present invention Figure 10 An enlarged schematic diagram of part D of the present invention; Figure 13 It is a schematic diagram of the friction damping elastic sheet of the present invention; Figure 14 It is a schematic diagram of the kidney-shaped sliding groove of the present invention; Figure 15 It is a schematic diagram of the clamping mechanism of the present invention; Figure 16 It is a cross-sectional schematic diagram of the clamping mechanism of the present invention; Figure 17 It is a schematic diagram of the clamping mechanism of the present invention after removing the fixed cover; Figure 18 It is a schematic diagram of the clamping block of the present invention; Figure 19 It is a schematic diagram of the rotating rod of the present invention; Figure 20 It is a schematic diagram of the low-power telescopic electrode of the present invention; Figure 21 It is a schematic diagram of the orthopedic laparoscope scalpel head of the present invention; Figure 22 It is a schematic diagram of the thoracoscopic laparoscope scalpel head of the present invention; Figure 23 It is an overall schematic diagram of the electrocautery pen of the present invention when the multifunctional knife head is replaced with a telescopic electrode; Figure 24 It is an overall schematic diagram of the electrocautery pen of the present invention when the multifunctional knife head is replaced with a telescopic electric hook; Figure 25 It is an overall schematic diagram of the electrocautery pen of the present invention when the multifunctional knife head is replaced with a four-in-one telescopic electrode.

[0032] 1. Conductive sleeve; 2. Circuit board; 3. Conductive elastic sheet; 4. Reducing sleeve; 5. Multifunctional cutter head; 6. Limit ring; 7. Pen body; 8. Conductive part; 51. Non-retractable electrode; 81. Conductive sheet; 811. Arc part; 41. First card slot; 812. Elastic card; 42. Second card slot; 52. Retractable electrode; 82. Conductive limit block; 821. Conductive arc elastic rod; 822. Fixed ring; 823. Annular groove; 824. Opening; 61. Horn slot; 62. Annular limit slot; 53. Four-in-one telescopic electrode; 531. Function tube; 532. Tapered tube; 533. Knife tongue electrode tube; 534. Friction damping elastic sheet; 535. Connecting tube; 536. Waist-shaped sliding groove; 537. Convex point; 538. Through hole; 70. Clamping mechanism; 701. Fixed disk; 702. Rotating disk; 703. Rotating rod; 704. Clamping block; 705. Fixed cover; 706. Flow hole; 707. Fixed seat; 708. Large bevel gear tooth; 700. Plane thread; 709. Tapered tooth; 710. Radial sliding groove; 711. Clamping block limit slot; 71. Tapered opening; 72. Thread. Detailed implementation mode

[0033] The following specific embodiments are only explanations of the present invention, and they do not limit the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment as needed after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0034] The present invention will be described in detail below with reference to the accompanying drawings in embodiments.

[0035] Embodiment 1

[0036] As Figure 1 and Figure 24 shown, a multifunctional replaceable cutter head electro-surgical pen includes a conductive sleeve 1, a circuit board 2, a conductive elastic sheet 3, a reducing sleeve 4, a multifunctional cutter head 5, a limit ring 6, a pen body 7, and a conductive part 8. The limit ring 6 is arranged inside the pen body 7 and at the front of the pen body 7. The reducing sleeve 4 is detachably arranged inside the limit ring 6 and extends to the outside of the pen body 7. The multifunctional cutter head 5 is arranged inside the reducing sleeve 4. The circuit board 2 is arranged inside the pen body 7 and above the conductive sleeve 1. The conductive elastic sheet 3 is arranged between the circuit board 2 and the conductive sleeve 1. The conductive elastic sheet 3 closely adheres to the outer side wall of the conductive sleeve 1. The conductive part 8 is arranged inside the conductive sleeve 1 and closely fits with the inner side wall of the conductive sleeve 1. The pen body 7 is a structure divided into upper and lower halves. The end of the pen body 7 is a tapered opening 71 with a gradually shrinking opening, and a spiral thread 72 is formed on the tapered opening. The cutter head can be a common electrode, an insulating retractable electrode, an insulating extension to avoid lateral thermal damage, or a retractable electric hook.

[0037] As Figure 20 shown, the multi-functional cutter head 5 is a low-power telescopic electrode 50. The cutter head of the low-power telescopic electrode head is straight, and there are smoking holes 501 on both sides of the cutter head for cutting and smoking of the skin, fat, and muscle.

[0038] As Figure 21 shown, the multi-functional cutter head 5 is an orthopedic endoscopic surgical cutter head.

[0039] As Figure 22 shown, the multi-functional cutter head 5 is applicable to thoracoscopic and laparoscopic surgical instruments.

[0040] As Figures 2 - 3 shown, the multi-functional cutter head 5 is a non-telescopic electrode 51, the conductive part 8 is a conductive sheet 81, and an upwardly arched arc portion 811 is formed at the rear end of the conductive sheet 81. The top of the arc portion 811 is in close contact with the inner wall of the conductive sleeve 1.

[0041] As Figure 4 shown, a first card slot 41 for facilitating the insertion of the conductive sheet 81 is provided at the rear end of the reduced-diameter sleeve 4. An elastic card 812 is formed on the conductive sheet 81. One end of the elastic card 812 is connected to the conductive sheet 81, and the other end is a free end. A second card slot 42 cooperating with the elastic card 812 is provided on the reduced-diameter sleeve 4.

[0042] As Figures 6 - 8 and Figure 23 shown, the multi-functional cutter head 5 is a telescopic electrode 52, the conductive part 8 is a conductive limit block 82. The telescopic electrode 52 is slidably arranged inside the conductive sleeve 1. The conductive limit block 82 is arranged at the rear end of the telescopic electrode 52. The conductive limit block 82 is always in close contact with the inner wall of the conductive sleeve 1 during the sliding process. The conductive limit block 82 includes a conductive arc-shaped elastic rod 821 and a fixing ring 822. The fixing ring 822 is fixed at the rear end of the telescopic electrode 52. An annular groove 823 is provided on the side wall of the fixing ring 822. A plurality of the conductive arc-shaped elastic rods 821 are circumferentially arranged on the annular groove 823, and an opening 824 is formed between the two conductive arc-shaped elastic rods 821 at the starting end and the ending end.

[0043] As Figure 5 shown, the inner wall of the front part of the limit ring 6 is a horn-shaped groove 61 that gradually narrows from the front end to the rear end. An annular limit groove 62 for limiting the conductive sleeve 1 is provided at the rear part of the limit ring 6.

[0044] Working principle: As Figures 1 - 11As shown in the figure, when the present invention is in use, when it is necessary to replace it with a non-retractable ordinary electrode knife for use, the reducing sleeve 4 provided with the conductive sheet 81 is inserted into the pen body 7, so that the top of the arc portion 811 is in close contact with the inner side wall of the conductive sleeve 1, and power is supplied to work. When it is necessary to replace it with a retractable electrode knife, the retractable electrode 52 is inserted into the conductive sleeve 1. During the sliding process, the conductive limit block 82 is always in close contact with the inner side wall of the conductive sleeve 1, ensuring stable current transmission while ensuring retraction. During the whole process, when it is necessary to smoke, only need to connect the smoking pipe to smoke. Different function tool heads can be replaced according to the surgical needs to adapt to various surgical scenarios and reduce the frequency of replacing instruments during the operation.

[0045] Embodiment 2

[0046] As Figures 9 - 14 and Figure 25 As shown in the figure, the retractable electrode 52 is a four-in-one retractable electrode 53. The four-in-one retractable electrode 53 includes a functional tube 531, an inclined mouth tube 532, a tongue electrode tube 533, a friction damping elastic sheet 534, and a connecting tube 535. The functional tube 531 is arranged in the conductive sleeve 1. The conductive limit block 82 is sleeved and fixed on the outer side wall of the functional tube 531. The tongue electrode tube 533 is arranged in the functional tube 531. The connecting tube 535 is arranged between the tongue electrode tube 533 and the functional tube 531. The inclined mouth tube 532 is fixedly connected to the front end of the connecting tube 535 and is located outside the tongue electrode tube 533. The friction damping elastic sheet 534 is arranged between the functional tube 531 and the connecting tube 535. Two waist-shaped sliding grooves 536 are formed in the part of the tongue electrode tube 533 located in the connecting tube 535. The two waist-shaped sliding grooves 536 are symmetrically arranged. Convex points 537 are formed on the friction damping elastic sheet 534. Through holes 538 are formed in the connecting tube 535 corresponding to the positions of the convex points. The convex points 537 pass through the through holes 538 and are arranged in the waist-shaped sliding grooves 536.

[0047] As Figures 15 - 19As shown in the figure, a clamping mechanism 70 is further provided at the rear end of the pen body 7. The clamping mechanism 70 includes a fixed disk 701, a rotating disk 702, a rotating rod 703, a clamping block 704, and a fixed cover 705. The fixed disk 701 is fixed at the end of the pen body 7. A circulation hole 706 is formed in the middle of the fixed disk 701. A fixed seat 707 is formed around the circulation hole 706. The rotating disk 702 is rotatably arranged on the top of the fixed seat 707. The fixed cover 705 is sleeved outside the fixed seat 707 and the rotating disk 702 and is fixedly connected to the fixed disk 701. A large bevel gear tooth 708 is provided at the bottom of the rotating disk 702. A planar thread 700 is provided at the top of the rotating disk 702. A conical tooth 709 meshing with the large bevel gear tooth 708 is provided on the rotating rod 703. The end of the rotating rod 703 penetrates through the fixed cover 705 and extends outside the pen body 7. The rotating rod 703 and the fixed cover 705 are rotatably connected through a bearing. More than three radial sliding grooves 710 are provided at the top of the fixed cover 705. The clamping block 704 is slidably arranged in the radial sliding groove 710. A clamping block limiting groove 711 cooperating with the planar thread 700 is formed at the bottom of the clamping block 704.

Claims

1. A multifunctional electric knife pen with replaceable blade head, characterized in that: The invention comprises a conductive sleeve (1), a circuit board (2), a conductive spring sheet (3), a reducer sleeve (4), a multifunctional blade head (5), a limiting ring (6), a pen body (7), and a conductive member (8), wherein the limiting ring (6) is arranged inside the pen body (7) and located at the front part of the pen body (7), the reducing sleeve (4) is detachably arranged inside the limiting ring (6) and extends to the outside of the pen body (7), the multifunctional blade head (5) is arranged inside the reducing sleeve (4), the circuit board (2) is arranged inside the pen body (7) and located above the conductive sleeve (1), the conductive spring sheet (3) is arranged between the circuit board (2) and the conductive sleeve (1), the conductive spring sheet (3) is closely attached to the outer side wall of the conductive sleeve (1), and the conductive member (8) is arranged inside the conductive sleeve (1) and closely attached to the inner side wall of the conductive sleeve (1).

2. The multifunctional electric surgical pen with replaceable blade head according to claim 1, characterized in that: The multifunctional blade head (5) is a non-retractable electrode (51), the conductive member (8) is a conductive sheet (81), a rear end of the conductive sheet (81) is formed with an upwardly arched arc portion (811), and the top of the arc portion (811) is tightly fitted with the inner side wall of the conductive sleeve (1).

3. The multifunctional electric surgical pen with replaceable blade head according to claim 2, characterized in that: The rear end of the reducing sleeve (4) is provided with a first card slot (41) for facilitating the insertion of the conductive sheet (81); an elastic card (812) is formed on the conductive sheet (81); one end of the elastic card (812) is connected to the conductive sheet (81) and the other end is a free end; the reducing sleeve (4) is provided with a second card slot (42) for cooperating with the elastic card (812).

4. The multifunctional electric surgical pen with replaceable blade head according to claim 1, characterized in that: The multifunctional knife head (5) is a retractable electrode (52), the conductive member (8) is a conductive stop block (82), the retractable electrode (52) is slidably arranged inside the conductive sleeve (1), the conductive stop block (82) is arranged at the rear end of the retractable electrode (52), and the conductive stop block (82) is always in close contact with the inner wall of the conductive sleeve (1) during the sliding process.

5. The multifunctional electric surgical pen with replaceable blade head according to claim 4, characterized in that: The conductive limit block (82) comprises a conductive arc-shaped elastic rod (821) and a fixing ring (822); the fixing ring (822) is fixed to the rear end of the retractable electrode (52); an annular groove (823) is provided on the side wall of the fixing ring (822); a plurality of the conductive arc-shaped elastic rods (821) are arranged in a circumferential array on the annular groove (823); an opening (824) is formed between the two conductive arc-shaped elastic rods (821) at the starting end and the end end.

6. The multifunctional electric surgical pen with replaceable blade head according to claim 1, characterized in that: The inner wall of the front portion of the limiting ring (6) is in the form of a trumpet groove (61) which gradually shrinks in a direction from the front end to the rear end, and the rear portion of the limiting ring (6) is provided with an annular limiting groove (62) for limiting the conductive sleeve (1).

7. The multifunctional electric surgical pen with replaceable blade head according to claim 5, characterized in that: The retractable electrode (52) is a four-in-one retractable electrode (53). The four-in-one retractable electrode (53) comprises a functional tube (531), an oblique-mouth tube (532), a knife-tongue electrode tube (533), a friction damping spring sheet (534), and a connecting tube (535). The functional tube (531) is arranged in the conductive sleeve (1); the conductive limit block (82) is sleeved and fixed on the outer wall of the functional tube (531); the knife-tongue electrode tube (533) is arranged in the functional tube (531); the connecting tube (535) is arranged between the knife-tongue electrode tube (533) and the functional tube (531); the oblique-mouth tube (532) is fixedly connected to the front end of the connecting tube (535) and is located outside the knife-tongue electrode tube (533); and the friction damping spring sheet (534) is arranged between the functional tube (531) and the connecting tube (535).

8. The multifunctional electric surgical pen with replaceable blade head according to claim 7, characterized in that: The portion of the blade-tongue electrode tube (533) located on the connecting tube (535) is provided with two waist-shaped slide grooves (536), and the two waist-shaped slide grooves (536) are symmetrically arranged. A convex point (537) is formed on the friction damping spring sheet (534), and a through hole (538) is provided at a position of the connecting tube (535) corresponding to the convex point. The convex point (537) passes through the through hole (538) and is arranged in the waist-shaped slide groove (536).

9. The multifunctional electric surgical pen with replaceable blade head according to claim 8, characterized in that: The rear end of the pen body (7) is further provided with a clamping mechanism (70), the clamping mechanism (70) comprising a fixed disk (701), a rotating disk (702), a rotating rod (703), a clamping block (704), and a fixed cover (705), the fixed disk (701) being fixed to the rear end of the pen body (7), a flow hole (706) being provided in the middle of the fixed disk (701), a fixed seat (707) being formed around the flow hole (706), the rotating disk (702) being rotatably arranged on the top of the fixed seat (707), the fixed cover (705) being sleeved on the outer sides of the fixed seat (707) and the rotating disk (702) and being fixedly connected to the fixed disk (701). Then, a large bevel gear tooth (708) is provided at the bottom of the rotating disk (702), a plane thread (700) is provided at the top of the rotating disk (702), and a conical tooth (709) meshing with the large bevel gear tooth (708) is provided on the rotating rod (703). The end of the rotating rod (703) passes through the fixed cover (705) and extends to the outside of the pen body (7). The top of the fixed cover (705) is provided with more than three radial grooves (710), and the clamping block (704) is slidably arranged in the radial groove (710). The bottom of the clamping block (704) is formed with a clamping block limiting groove (711) that cooperates with the plane thread (700).

10. The multifunctional electric surgical pen with replaceable blade head according to claim 8, characterized in that: The pen body (7) is composed of an upper and lower half structure, the end of the pen body (7) is a tapered opening (71) with a gradually narrowing opening, and a spiral thread (72) is formed on the tapered opening.

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