Multi-functional electric pen with replaceable head

Abstract

The application discloses a multifunctional electric pen with replaceable tool bit, which comprises a conductive sleeve, a circuit board, a conductive spring, a variable-diameter sleeve, a multifunctional tool bit, a limiting ring, a pen body and a conductive part. The variable-diameter sleeve and the limiting ring can be replaced with tool bits of different functions according to the operation requirements, adapt to various operation scenes, reduce the frequency of replacing instruments during the operation, and make the smoke discharged through the conductive sleeve when the tool bit with smoke suction is replaced, effectively remove the operation smoke, improve the operation field of view, protect the health of medical staff and patients, and ensure the stability and reliability of current transmission according to the close cooperation of the conductive sleeve, the conductive spring and the conductive part, guarantee the detachability, avoid accidents caused by unstable current during the operation, and improve the operation safety.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electrotome, and particularly relates to a multifunctional electrotome pen with replaceable tool bit. BACKGROUND

[0002] The electrotome pen is a kind of medical instrument widely used in surgical operations, which realizes functions such as tissue cutting, hemostasis and coagulation through high-frequency current. However, when using the electrotome pen for operation, a large amount of surgical smoke will be generated, which not only blocks the surgical field of view, but also may contain harmful substances, posing a potential threat to the health of medical staff and patients. In order to solve this problem, smoke-suction electrotome (integrated smoke suction function) is introduced into the operation, which can effectively remove surgical smoke and improve the operation environment.

[0003] At present, there are various types of electrotomes on the market, mainly including smoke-suction electrotome, non-smoke-suction electrotome and electrotomes with specific functions (such as fine cutting knife, hemostatic knife, coagulation knife, etc.). The smoke-suction electrotome is suitable for complex operations with more smoke, while the non-smoke-suction electrotome is suitable for simple operations. In addition, electrotomes with different functions can meet the diversified needs of cutting precision, hemostatic effect and coagulation speed in operations.

[0004] However, the existing electrotome pen has many inconveniences when replacing different types of electrotomes. For example, replacing the electrotome requires disassembling the entire device, which is tedious and time-consuming, seriously affecting the operation efficiency. In addition, the smoke-suction function of some electrotome pens needs to rely on external equipment, increasing the complexity and difficulty of operation of the operating room. At the same time, the existing electrotome pen has limited types of electrotomes, which cannot meet the needs of diversified functions in complex operations.

[0005] In actual operations, doctors may need to quickly switch to using different types of electrotomes according to the operation process. For example, using non-smoke-suction electrotome for simple operation in the early stage of operation, and switching to smoke-suction electrotome in the stage with more smoke; or replacing the fine cutting knife when fine cutting is needed. However, the existing technology cannot meet the needs of such quick switching, resulting in reduced operation efficiency and even affecting the operation effect.

[0006] In order to solve the above problems, it is urgent to provide a multifunctional electrotome pen supporting quick replacement of different types of electrotomes (including smoke-suction and non-smoke-suction electrotomes), which can realize efficient and convenient switching of electrotomes, and integrate the smoke-suction function to simplify the operation process. SUMMARY

[0007] The purpose of the present application is to solve the problems in the background art and provide a multifunctional electrotome pen with replaceable tool bit.

[0008] The above technical purpose of the present application is realized by the following technical scheme:

[0009] A multifunctional replaceable head electric pencil includes a conductive sleeve, a circuit board, a conductive spring, a variable diameter sleeve, a multifunctional head, a limiting ring, a pencil body, and a conductive part. The limiting ring is arranged in the interior of the pencil body and located at the front of the pencil body. The variable diameter sleeve is detachably arranged in the limiting ring and extends to the exterior of the pencil body. The multifunctional head is arranged in the variable diameter sleeve. The circuit board is arranged in the interior of the pencil body and located above the conductive sleeve. The conductive spring is arranged between the circuit board and the conductive sleeve. The conductive spring is tightly attached to the outer sidewall of the conductive sleeve. The conductive part is arranged in the interior of the conductive sleeve and tightly attached to the inner sidewall of the conductive sleeve. The variable diameter sleeve changes when different types of heads are replaced, so that the pencil body does not change during the operation.

[0010] The variable diameter sleeve and the limiting ring can be replaced with different functional heads according to the operation requirements, adapt to various operation scenes, reduce the frequency of replacing instruments during the operation, and effectively remove the surgical smoke through the conductive sleeve when the head with smoke suction is replaced. The surgical field is improved, the health of medical staff and patients is protected, the stability and reliability of current transmission are ensured through the close cooperation of the conductive sleeve, the conductive spring and the conductive part, the detachable function is ensured, the accidents caused by unstable current during the operation are avoided, and the operation safety is improved.

[0011] The multifunctional head is a non-extendable electrode, the conductive part is a conductive sheet, the rear end of the conductive sheet is formed with an upwardly arched arc-shaped part, and the top of the arc-shaped part is tightly attached to the inner sidewall of the conductive sleeve.

[0012] The arc-shaped part is tightly attached to the inner sidewall of the conductive sleeve, the conductive spring is tightly attached to the outer sidewall of the conductive sleeve, so that the same conductive limiting block as the extendable electrode is not needed when the ordinary sleeve without smoke suction is replaced, the head does not need to be extended into the conductive sleeve, the stability of current transmission is ensured, the cost is reduced, and the long-term promotion of the product is facilitated.

[0013] Preferably, the rear end of the variable diameter sleeve is provided with a first clamping groove for inserting the conductive sheet, the conductive sheet is formed with an elastic clamping piece, one end of the elastic clamping piece is connected with the conductive sheet, and the other end is a free end, and the variable diameter sleeve is provided with a second clamping groove matched with the elastic clamping piece.

[0014] The conductive sheet is clamped into the variable diameter sleeve through the first clamping groove, and the elastic clamping piece is clamped in the second clamping groove, so as to fix the conductive sheet and the variable diameter sleeve.

[0015] The multifunctional cutter head is a telescopic electrode, the conductive part is a conductive limiting block, the telescopic electrode is slidably arranged in the inside of the conductive sleeve, the conductive limiting block is arranged at the rear end of the telescopic electrode, the conductive limiting block is always tightly combined with the inside wall of the conductive sleeve in the sliding process, and the telescopic electrode is provided with an insulating sleeve at the part in the conductive sleeve.

[0016] The conductive limiting block is used to make the telescopic electrode always keep stable transmission of current when sliding in the conductive sleeve.

[0017] Preferably, the conductive limiting block comprises conductive arc-shaped elastic rods and a fixing ring, the fixing ring is fixed at the rear end of the telescopic electrode, a ring-shaped groove is formed in the side wall of the fixing ring, a plurality of the conductive arc-shaped elastic rods are arranged in a circumferential array on the ring-shaped groove, an opening is formed between the two conductive arc-shaped elastic rods at the starting end and the terminal end, and the conductive arc-shaped elastic rods are elastic metal sheets.

[0018] The conductive arc-shaped elastic rods are used to make the telescopic electrode be pressed against the inner wall of the conductive sleeve when sliding, so that the conductive sleeve and the electrode are kept in good electrical connection, and the electrode is stably positioned at the current telescopic length position.

[0019] The inner wall of the front part of the limiting ring is a horn groove which is gradually reduced from the front end to the rear end, the limiting ring has a certain elasticity, and the rear part of the limiting ring is provided with a ring-shaped limiting groove for limiting the conductive sleeve.

[0020] The horn groove is used to make the variable-diameter sleeve be easily inserted into the pen body, and the variable-diameter sleeve is deformed after being inserted, so that the variable-diameter sleeve is firmly locked, and the detachable connection is realized.

[0021] The telescopic electrode is a four-in-one telescopic electrode, the four-in-one telescopic electrode comprises a function tube, an inclined pipe, a cutter tongue electrode tube, a friction damping elastic sheet and a connecting tube, the function tube is arranged in the conductive sleeve, the conductive limiting block is sleeved and fixed on the outside wall of the function tube, the cutter tongue electrode tube is arranged in the function tube, the connecting tube is arranged between the cutter tongue electrode tube and the function tube, the inclined pipe is fixedly connected with the front end of the connecting tube and located outside the cutter tongue electrode tube, and the friction damping elastic sheet is arranged between the function tube and the connecting tube.

[0022] The inclined pipe is pulled out to drive the connection of the connecting tube, so that the inclined pipe can hide the cutter tongue electrode tube and become the inclined pipe for use, the function of the scraper in the operation is facilitated, the inclined pipe is retracted, the cutter tongue is exposed, the functions of electric cutting, electric coagulation and separation are realized, the four-in-one function is realized, the inclined pipe can be used as a smoke suction pipe at a proper position, the multifunction is realized, and the number of replacement of the cutter head is reduced.

[0023] The present application increases the friction force between the connecting pipe and the functional pipe by the friction damping spring, plays a damping role, and does not move after being adjusted to the appropriate position.

[0024] The two waist-shaped sliding grooves are symmetrically arranged, the convex points are formed on the friction damping spring, the through holes are formed on the connecting pipe corresponding to the positions of the convex points, the convex points are arranged in the waist-shaped sliding grooves through the through holes, and the blade tongue is arranged at the tip position of the pipe opening of the beveled pipe.

[0025] The waist-shaped sliding groove and the convex point are arranged, the stroke of the expansion and contraction is limited, the connecting pipe is prevented from falling off, the beveled pipe is rotated, the blade tongue is also rotated, the blade tongue is always arranged at the tip position of the pipe opening of the beveled pipe, and the visual field of the operation is ensured.

[0026] The functional pipe, the connecting pipe, the blade tongue electrode pipe and the beveled pipe are all made of conductive materials, the outer side wall of the beveled pipe is provided with an insulating material, and manual expansion and contraction are facilitated through the beveled pipe.

[0027] The rear end of the pen body is also provided with a clamping mechanism, the clamping mechanism comprises a fixed disc, a rotating disc, a rotating rod, a clamping block and a fixed cover, the fixed disc is fixed at the end of the pen body, a through hole is formed in the middle of the fixed disc, a fixed seat is formed around the through hole, the rotating disc is rotatably arranged on the top of the fixed seat and is connected through a bearing, the fixed cover is arranged outside the fixed seat and the rotating disc and is fixedly connected with the fixed disc, a large bevel gear tooth is arranged on the bottom of the rotating disc, a flat thread is arranged on the top of the rotating disc, a conical tooth is arranged on the rotating rod and is engaged with the large bevel gear tooth, the end of the rotating rod penetrates through the fixed cover and extends out of the pen body, more than three radial sliding grooves are arranged on the top of the fixed cover, the clamping block is slidably arranged in the radial sliding groove, and a clamping block limiting groove is formed on the bottom of the clamping block and is matched with the flat thread.

[0028] The clamping mechanism is used to clamp the functional pipe in the clamping mechanism after the functional pipe passes through the conductive sleeve, and the movement of the functional pipe is prevented.

[0029] The rotating rod is rotated, the rotating disc is rotated through the cooperation of the large bevel gear tooth and the conical tooth, the flat thread drives the three clamping blocks to move at the same time, and the clamping or loosening of the functional pipe is realized.

[0030] Preferably, the pen body is a two-half structure, the front end of the conductive sleeve is a horn mechanism, which can be clamped in the limiting ring and will not move, through the two-half structure, it is convenient to install, the end of the pen body is a tapered opening that gradually narrows, a spiral thread is formed on the tapered opening, through the tapered opening, the end of the pen body can replace different sleeves according to different situations, when smoking is not needed, a closed sleeve is replaced, and when smoking is needed, a smoking pipeline is replaced.

[0031] In summary, the beneficial effects of the present application are:

[0032] 1. The present application can replace the knife head with different functions according to the operation requirements, adapt to various operation scenes, reduce the frequency of replacing instruments during operation, through the conductive sleeve, when the knife head with smoking is replaced, the smoke can be discharged through the conductive sleeve, effectively removing the operation smoke, improving the operation field of view, protecting the health of medical staff and patients, and at the same time, according to the close cooperation of the conductive sleeve, the conductive spring plate and the conductive part, the stability and reliability of current transmission are ensured, the detachable function is ensured, the accidental situation caused by unstable current during operation is avoided, and the operation safety is improved;

[0033] 2. The arc-shaped part is tightly attached to the inner side wall of the conductive sleeve, the conductive spring plate is tightly attached to the outer side wall of the conductive sleeve, so that when the sleeve without smoking is replaced, the conductive limiting block as the telescopic electrode does not need to be used, the knife head does not need to be extended into the conductive sleeve, the stability of current transmission is ensured, the cost is reduced, and the long-term promotion of the product is beneficial;

[0034] 3. The present application drives the connection of the connecting pipe by pulling the beveled pipe, so that the beveled pipe can hide the tongue electrode pipe, become a beveled pipe for use, facilitate the rake function in operation, the beveled pipe is retracted, the tongue is exposed, the functions of electric cutting, electric coagulation and separation are realized, four-in-one is realized, the beveled pipe can be adjusted to a suitable position to be used as a smoking pipe, multi-function is realized, and the number of replacing knife heads is reduced;

[0035] 4. The present application increases the friction force between the connecting pipe and the functional pipe through the friction damping spring plate, plays a damping role, and will not move after being adjusted to a suitable position. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the overall schematic diagram of the multifunctional knife head of the present application as a non-telescopic electrode electric knife pen;

[0037] Figure 2 It is the cross-sectional view of the present application as a non-telescopic electrode;

[0038] Figure 3 It is the present application Figure 2An enlarged view of point A;

[0039] Figure 4 This is a schematic diagram of the variable diameter sleeve and conductive sheet of the non-extendable electrode of the present invention.

[0040] Figure 5 This is a schematic diagram of the limiting ring of the present invention;

[0041] Figure 6 This is a cross-sectional schematic diagram of the present invention with a retractable electrode;

[0042] Figure 7 This is the present invention. Figure 6 An enlarged view of point B;

[0043] Figure 8 This is a schematic diagram of the retractable electrode of the present invention;

[0044] Figure 9 This is a schematic diagram of the four-in-one telescopic electrode of the present invention;

[0045] Figure 10 This is a cross-sectional schematic diagram of the four-in-one telescopic electrode of the present invention;

[0046] Figure 11 This is the present invention. Figure 10 An enlarged view of point C;

[0047] Figure 12 This is the present invention. Figure 10 An enlarged schematic diagram of point D;

[0048] Figure 13 This is a schematic diagram of the friction damping spring of the present invention;

[0049] Figure 14 This is a schematic diagram of the waist-shaped sliding groove of the present invention;

[0050] Figure 15 This is a schematic diagram of the clamping mechanism of the present invention;

[0051] Figure 16 This is a cross-sectional schematic diagram of the clamping mechanism of the present invention;

[0052] Figure 17 This is a schematic diagram of the clamping mechanism of the present invention after the fixing cover is removed;

[0053] Figure 18 This is a schematic diagram of the clamping block of the present invention;

[0054] Figure 19 This is a schematic diagram of the rotating rod of the present invention;

[0055] Figure 20 This is a schematic diagram of the low-power telescopic electrode of the present invention;

[0056] Figure 21 is a schematic diagram of the orthopedic endoscopic scalpel head of the present application;

[0057] Figure 22 is a schematic diagram of the thoracoscopic and laparoscopic scalpel head of the present application;

[0058] Figure 23 is a schematic diagram of the overall multifunctional scalpel head replaced with a telescopic electrode electric pencil of the present application;

[0059] Figure 24 is a schematic diagram of the overall multifunctional scalpel head replaced with a telescopic electric hook electric pencil of the present application;

[0060] Figure 25 is a schematic diagram of the overall multifunctional scalpel head replaced with a telescopic electric hook electric pencil of the present application.

[0061] 1, electrically conductive sleeve; 2, circuit board; 3, electrically conductive spring; 4, variable diameter sleeve; 5, multifunctional scalpel head; 6, limiting ring; 7, pencil body; 8, electrically conductive part; 51, non-telescopic electrode; 81, electrically conductive sheet; 811, arc-shaped part; 41, first clamping groove; 812, elastic clamping sheet; 42, second clamping groove; 52, telescopic electrode; 82, electrically conductive limiting block; 821, electrically conductive arc-shaped elastic rod; 822, fixing ring; 823, annular groove; 824, opening; 61, trumpet slot; 62, annular limiting slot; 53, four-in-one telescopic electrode; 531, functional tube; 532, beveled tube; 533, tongue electrode tube; 534, friction damping spring; 535, connecting tube; 536, waist-shaped sliding groove; 537, protrusion; 538, through hole; 70, clamping mechanism; 701, fixed disc; 702, rotating disc; 703, rotating rod; 704, clamping block; 705, fixed cover; 706, flow-through hole; 707, fixed seat; 708, large bevel gear tooth; 700, flat thread; 709, tapered tooth; 710, radial sliding groove; 711, clamping block limiting slot; 71, tapered port; 72, thread. DETAILED DESCRIPTION

[0062] The following specific examples are merely illustrative of the present application and are not intended to limit the present application. Those skilled in the art can make modifications to the present examples without creative contribution after reading the present specification, and as long as they are within the scope of the claims of the present application, they are protected by the patent law.

[0063] The present application will be described in detail below with reference to the accompanying drawings.

[0064] Example 1

[0065] As Figure 1 and Figure 24As shown, a multifunctional replaceable head electric pencil includes a conductive sleeve 1, a circuit board 2, a conductive spring 3, a variable diameter sleeve 4, a multifunctional head 5, a limiting ring 6, a pencil body 7, and a conductive part 8. The limiting ring 6 is arranged inside the pencil body 7 and located at the front of the pencil body 7. The variable diameter sleeve 4 is detachably arranged inside the limiting ring 6 and extends to the outside of the pencil body 7. The multifunctional head 5 is arranged in the variable diameter sleeve 4. The circuit board 2 is arranged inside the pencil body 7 and above the conductive sleeve 1. The conductive spring 3 is arranged between the circuit board 2 and the conductive sleeve 1. The conductive spring 3 tightly adheres to the outer sidewall of the conductive sleeve 1. The conductive part 8 is arranged inside the conductive sleeve 1 and tightly adheres to the inner sidewall of the conductive sleeve 1. The pencil body 7 has a top-and-bottom structure. The end of the pencil body 7 is a tapered opening 71. A helical thread 72 is formed on the tapered opening. The head can be a common electrode, an insulated telescopic electrode, an insulated extension, which avoids lateral heat damage, or a telescopic electric hook.

[0066] As shown in Figure 20 , the multifunctional head 5 is a low-power telescopic electrode 50. The head of the low-power telescopic electrode is straight. Both sides of the head have smoke suction holes 501 for cutting and suctioning skin, fat, and muscle.

[0067] As shown in Figure 21 , the multifunctional head 5 is an orthopedic endoscopic surgical head.

[0068] As shown in Figure 22 , the multifunctional head 5 is suitable for thoracic and abdominal endoscopic surgical instruments.

[0069] As shown in Figures 2-3 , the multifunctional head 5 is a non-telescopic electrode 51. The conductive part 8 is a conductive sheet 81. The rear end of the conductive sheet 81 is formed with an upwardly arched arc-shaped part 811. The top of the arc-shaped part 811 tightly adheres to the inner sidewall of the conductive sleeve 1.

[0070] As shown in Figure 4 , the rear end of the variable diameter sleeve 4 is provided with a first clamping groove 41 for facilitating the insertion of the conductive sheet 81. The conductive sheet 81 is formed with an elastic clamping sheet 812. One end of the elastic clamping sheet 812 is connected to the conductive sheet 81, and the other end is a free end. The variable diameter sleeve 4 is provided with a second clamping groove 42 which cooperates with the elastic clamping sheet 812.

[0071] As shown in Figures 6-8 and Figure 23As shown, the multifunctional tool head 5 is a telescopic electrode 52, the conductive part 8 is a conductive limiting block 82, the telescopic electrode 52 is slidably arranged in the inside of the conductive sleeve 1, the conductive limiting block 82 is arranged at the rear end of the telescopic electrode 52, the conductive limiting block 82 is always in close contact with the inner side wall of the conductive sleeve 1 during sliding, the conductive limiting block 82 comprises 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, a ring-shaped groove 823 is formed in the side wall of the fixing ring 822, and a plurality of conductive arc-shaped elastic rods 821 are arranged in a circumferential array on the ring-shaped groove 823, and an opening 824 is formed between the two conductive arc-shaped elastic rods 821 at the starting end and the terminal end.

[0072] As shown in Figure 5 , the inner wall of the front part of the limiting ring 6 is a horn groove 61 gradually reduced from the front end to the rear end, and the rear part of the limiting ring 6 is provided with an annular limiting groove 62 for limiting the conductive sleeve 1.

[0073] Working principle: as shown in Figures 1-11 , when the ordinary electrode knife without telescopic function is needed to be replaced, the variable diameter sleeve 4 provided with the conductive sheet 81 is inserted into the pen body 7, so that the top of the arc-shaped part 811 is in close contact with the inner side wall of the conductive sleeve 1, and the electric current is conducted to work, when the telescopic electrode knife is needed to be replaced, the telescopic electrode 52 is inserted into the conductive sleeve 1, and the conductive limiting block 82 is always in close contact with the inner side wall of the conductive sleeve 1 during sliding, so as to ensure the telescopic function and stable current transmission, during the whole process, when smoking is needed, only the smoking pipeline needs to be connected to smoke, and different function tool heads can be replaced according to the operation requirements, so as to adapt to various operation scenes and reduce the frequency of replacing instruments during operation.

[0074] Example 2

[0075] As shown in Figures 9-14 and Figure 25As shown, the telescopic electrode 52 is a four-in-one telescopic electrode 53, which comprises a functional tube 531, an oblique tube 532, a tongue electrode tube 533, a friction damping spring 534, and a connecting tube 535. The functional tube 531 is arranged in the conductive sleeve 1, the conductive limiting block 82 is sleeved and fixed on the outer sidewall 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 oblique tube 532 is fixedly connected with the front end of the connecting tube 535 and located outside the tongue electrode tube 533, the friction damping spring 534 is arranged between the functional tube 531 and the connecting tube 535, and the tongue electrode tube 533 is partially provided with two waist-shaped sliding grooves 536, which are symmetrically arranged. The friction damping spring 534 is formed with a protrusion 537, the connecting tube 535 is provided with a through hole 538 corresponding to the position of the protrusion, and the protrusion 537 is arranged in the waist-shaped sliding groove 536 through the through hole 538.

[0076] As shown in the drawings, Figures 15-19 As shown, the rear end of the pen body 7 is further provided with a clamping mechanism 70, which comprises a fixed disc 701, a rotating disc 702, a rotating rod 703, a clamping block 704, and a fixed cover 705. The fixed disc 701 is fixed at the end of the pen body 7, the middle part of the fixed disc 701 is provided with a flow-through hole 706, the periphery of the flow-through hole 706 is formed with a fixed seat 707, the rotating disc 702 is rotatably arranged on the top of the fixed seat 707, the fixed cover 705 is sleeved on the outside of the fixed seat 707 and the rotating disc 702 and is fixedly connected with the fixed disc 701, the bottom of the rotating disc 702 is provided with a large bevel gear tooth 708, the top of the rotating disc 702 is provided with a flat thread 700, the rotating rod 703 is provided with a conical tooth 709 which is engaged with the large bevel gear tooth 708, the end of the rotating rod 703 penetrates through the fixed cover 705 and extends out of the pen body 7, the rotating rod 703 is rotatably connected with the fixed cover 705 through a bearing, the top of the fixed cover 705 is provided with three or more radial sliding grooves 710, the clamping block 704 is slidably arranged in the radial sliding groove 710, and the bottom of the clamping block 704 is formed with a clamping block limiting groove 711 which is matched with the flat thread 700.

Claims

1. A multifunction interchangeable tip electric pencil, characterized in that, The utility model provides a multifunctional pen, including electrically conductive sleeve (1), circuit board (2), electrically conductive elastic sheet (3), variable diameter sleeve (4), multifunctional cutter head (5), limit ring (6), pen body (7), electrically conductive part (8), limit ring (6) is located at the inside of pen body (7) and is located at the front of pen body (7), variable diameter sleeve (4) is detachably arranged in limit ring (6) and extends to the outside of pen body (7), multifunctional cutter head (5) is arranged in variable diameter sleeve (4), circuit board (2) is arranged in the inside of pen body (7) and is located above electrically conductive sleeve (1), electrically conductive elastic sheet (3) is arranged between circuit board (2) and electrically conductive sleeve (1), electrically conductive elastic sheet (3) is tightly attached to the outside wall of electrically conductive sleeve (1), electrically conductive part (8) is arranged in the inside of electrically conductive sleeve (1) and is tightly attached to the inside wall of electrically conductive sleeve (1), Multifunctional cutter head (5) is telescopic electrode (52), electrically conductive part (8) is electrically conductive limit block (82), telescopic electrode (52) is slidably arranged in the inside of electrically conductive sleeve (1), electrically conductive limit block (82) is arranged at the rear end of telescopic electrode (52), electrically conductive limit block (82) is always tightly attached to the inside wall of electrically conductive sleeve (1) in the sliding process, Electrically conductive limit block (82) includes electrically conductive arc-shaped elastic rod (821) and fixed ring (822), fixed ring (822) is fixed at the rear end of telescopic electrode (52), annular groove (823) is formed in the side wall of fixed ring (822), a plurality of electrically conductive arc-shaped elastic rods (821) are arranged in the annular groove (823) in a circumferential array, and an opening (824) is formed between the two electrically conductive arc-shaped elastic rods (821) at the beginning end and the end. The inner wall of the front part of the limit ring (6) is a trumpet slot (61) that gradually narrows from the front end to the rear end, and the rear part of the limit ring (6) is provided with an annular limiting groove (62) for limiting the electrically conductive sleeve (1). Telescopic electrode (52) is a four-in-one telescopic electrode (53), which includes a function tube (531), an inclined pipe (532), a tongue electrode tube (533), a friction damping elastic sheet (534), and a connecting pipe (535). The function tube (531) is arranged in the electrically conductive sleeve (1), the electrically conductive limit block (82) is sleeved and fixed on the outer side wall of the function tube (531), the tongue electrode tube (533) is arranged in the function tube (531), the connecting pipe (535) is arranged between the tongue electrode tube (533) and the function tube (531), the inclined pipe (532) is fixedly connected with the front end of the connecting pipe (535) and located outside the tongue electrode tube (533), and the friction damping elastic sheet (534) is arranged between the function tube (531) and the connecting pipe (535). The knife tongue electrode pipe (533) is located in the part of the connecting pipe (535), and two waist-shaped sliding grooves (536) are formed in the part, the two waist-shaped sliding grooves (536) are symmetrically arranged, the friction damping elastic sheet (534) is formed with a protrusion (537), the connecting pipe (535) is provided with a through hole (538) corresponding to the position of the protrusion, and the protrusion (537) is arranged in the waist-shaped sliding groove (536) through the through hole (538).

2. The multi-functional interchangeable-shaft electric pen-knife according to claim 1, characterized in that, The multifunctional tool bit (5) is a non-retractable electrode (51), the conductive part (8) is a conductive sheet (81), the rear end of the conductive sheet (81) is formed with an upwardly arched arc-shaped part (811), and the top of the arc-shaped part (811) is closely attached to the inner side wall of the conductive sleeve (1).

3. The multi-functional interchangeable-shaft electric pen-knife according to claim 2, characterized in that, The rear end of the variable-diameter sleeve (4) is provided with a first clamping groove (41) for facilitating insertion of the conductive sheet (81), the conductive sheet (81) is formed with an elastic clamping piece (812), one end of the elastic clamping piece (812) is connected with the conductive sheet (81), and the other end is a free end, and the variable-diameter sleeve (4) is provided with a second clamping groove (42) matched with the elastic clamping piece (812).

4. The multi-functional interchangeable-shaft electric pen-knife according to claim 1, characterized in that, The rear end of the pen body (7) is also provided with a clamping mechanism (70), the clamping mechanism (70) comprises a fixed disc (701), a rotating disc (702), a rotating rod (703), a clamping block (704) and a fixed cover (705), the fixed disc (701) is fixed at the end of the pen body (7), a through hole (706) is formed in the middle of the fixed disc (701), a fixed seat (707) is formed around the through hole (706), the rotating disc (702) is rotatably arranged on the top of the fixed seat (707), the fixed cover (705) is arranged outside the fixed seat (707) and the rotating disc (702) and is fixedly connected with the fixed disc (701), a large bevel gear tooth (708) is arranged on the bottom of the rotating disc (702), a flat thread (700) is arranged on the top of the rotating disc (702), a bevel gear tooth (709) is arranged on the rotating rod (703) and is engaged with the large bevel gear tooth (708), the end of the rotating rod (703) penetrates through the fixed cover (705) and extends out of the pen body (7), more than three radial sliding grooves (710) are arranged on the top of the fixed cover (705), the clamping block (704) is slidably arranged in the radial sliding groove (710), and a clamping block limiting groove (711) matched with the flat thread (700) is formed in the bottom of the clamping block (704).

5. The multi-functional interchangeable-shaft electric pen-knife according to claim 4, characterized in that, The pen body (7) is a two-half structure, the end of the pen body (7) is a tapered opening (71) which is gradually reduced, and a spiral thread (72) is formed on the tapered opening.

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