Electric knife pen capable of stretching out and drawing back simultaneously and replacing knife head

Abstract

The invention relates to the technical field of medical instruments, in particular to an electric knife pen capable of stretching out and drawing back simultaneously and replacing a knife head. Comprising a pen body, a telescopic electrode and a tool bit, the pen body is provided with an electrode installation part where the telescopic electrode is installed, the electrode installation part is provided with a fixator installation groove, an electrode fixator is arranged in the fixator installation groove, the telescopic electrode is installed in the pen body through the electrode fixator and stretches out, and the tool bit is arranged in the pen body. The cutter head is arranged at the head part of the telescopic electrode; the telescopic electrode of the electrotome pen can be extended and shortened according to the depth of a surgical site, the knife head can be replaced with other heads of different shapes and different lengths according to needs, and the telescopic electrode and the knife head of the electrotome pen can be replaced. According to the electric knife pen, the knife head of the electric knife pen can be rapidly replaced to complete different operation tasks according to actual operation requirements in the operation process, so that the operation process is smoother, and the operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an electrosurgical pen that can be telescopically extended and have its tip replaced simultaneously. Background Art

[0002] An electrosurgical pen is a device commonly used in medical surgeries. It usually consists of a tip, a handle, and a connecting wire. During medical surgeries, it is mainly used for cutting tissues, hemostasis and blood coagulation, tissue coagulation, etc. The electrosurgical pen utilizes the heat generated by high-frequency current to achieve tissue cutting, hemostasis, and coagulation. When the tip of the electrosurgical pen contacts the tissue, the high-frequency current is transmitted through the tip to the tissue, causing the water in the tissue to rapidly evaporate and the protein to denature and coagulate, thereby achieving the effects of hemostasis and coagulation. By adjusting the output power and working mode of the electrosurgical pen, the speed and depth of cutting and blood coagulation can be controlled to meet the requirements of different surgeries.

[0003] During actual surgeries, different-shaped and different-sized tips are often selected according to the actual situation, such as operations on different tissues and different parts. And during deep surgeries, the extended length of the tip needs to be adjusted according to the depth of the surgical site. Therefore, during actual surgeries, when it is necessary to change the shape and function of the tip, an electrosurgical pen that can only be telescopically extended cannot be quickly replaced. Usually, the entire electrosurgical pen needs to be replaced. And in the case where the extended length of the tip needs to be adjusted, a tip that can only be replaced by plugging and unplugging cannot be replaced with a telescopically extendable tip. Each main body of the electrosurgical pen is usually fixedly configured and cannot be interchanged between a telescopically extendable tip and a plug-and-unplug tip, resulting in poor versatility and low surgical operation efficiency, which affects the final result of the surgery. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the background art and provide an electrosurgical pen that can be telescopically extended and have its tip replaced simultaneously. It can quickly replace the tip of the electrosurgical pen according to actual operation requirements during the surgery to complete different operation tasks, making the surgical process smoother and improving the surgical efficiency.

[0005] The above technical objective of the present invention is achieved through the following technical solutions: An electrosurgical pen that can be telescopically extended and have its tip replaced simultaneously, comprising a pen body, a telescopic electrode, and a tip. An electrode installation part is provided on the pen body at the position where the telescopic electrode is installed. A fixator installation groove is opened on the electrode installation part. An electrode fixator is arranged in the fixator installation groove. The telescopic electrode is installed inside the pen body through the electrode fixator and extends out. The tip is arranged at the head of the telescopic electrode. The telescopic electrode of the electrosurgical pen can be extended and shortened according to the depth of the surgical site. The tip can also be replaced with other tips of different shapes and different length dimensions as needed. Both the telescopic electrode and the tip of the electrosurgical pen can be replaced.

[0006] Preferably, a conductive tube is arranged inside the pen body. The conductive tube has a hollow structure. The outer wall of the electrode of the telescopic electrode is in direct contact with the inner wall of the conductive tube. After the electrosurgical pen is powered on, the current reaches the conductive tube and can be transmitted to the telescopic electrode through the conductive tube. The conductive tube of the electrosurgical pen can receive the high-frequency current transmitted from the PCB board. The diameter of the telescopic electrode is thicker than that of the plug-and-play electrode. The telescopic electrode is inserted into the conductive tube after passing through the electrode holder, and the outer wall of the telescopic electrode can be in direct contact with the inner wall of the conductive tube, making the conduction of the current smoother.

[0007] Preferably, an electrode insulating layer is further arranged on the electrode of the telescopic electrode extending outside the pen body. The electrode insulating layer directly extends away from the head of the telescopic electrode by a length of 2-10 mm. The electrode part of the telescopic electrode extending outside the pen body is also coated with an electrode insulating layer, which can prevent the doctor from being scalded by the high-frequency current when accidentally touching the electrode during the operation, ensuring the safety of the medical staff's operation and improving the accuracy of the operation at the same time.

[0008] Preferably, the edge size of the blade of the knife head is 0.05-0.1 mm. When the electrosurgical pen is not started during clinical use, the knife head will not cut the skin due to being too sharp. The design of the blade size of the knife head can make the discharge of the knife head more concentrated, so that electrosection and electrocoagulation of the operation can be realized under low power conditions. A temperature measuring sensor is also arranged at the position of the telescopic electrode close to the knife head, which can collect the temperature of the cutting part in real time when the electrosurgical pen is cutting. The design of the blade size of the knife head makes the knife head sharp but not too sharp, so that the skin will not be scratched by the blade when the medical staff accidentally touches the blade. At the same time, the blade design of the knife head can make the discharge of the knife head of the electrosurgical pen more concentrated, so as to achieve electrosection and electrocoagulation of the operation process with a lower current power. And the low power causes less damage to the patient, and the patient's postoperative recovery time is faster, greatly reducing the pain of the patient after the operation. At the same time, a temperature measuring sensor is also arranged at the position of the electrode close to the knife head, which can monitor the temperature of the wound in real time throughout the operation process, ensure that the temperature of the operation process is controlled within the specified range, avoid secondary damage to the patient caused by thermal damage or carbonization of biological tissue due to high temperature, and improve the safety and accuracy of the operation process.

[0009] Preferably, the electrode holder is designed as a ring-shaped rubber ring structure and made of silicone material with a relatively high coefficient of friction. A number of engaging teeth are provided on the inner wall of the electrode holder. The electrode holder and the telescopic electrode are installed by interference fit. The electrode holder can provide sufficient insertion and extraction force for the telescopic electrode while ensuring the stability of the cutter head and the telescopic electrode and being compatible with cutter heads and telescopic electrodes of different diameters. The electrode holder is a ring-shaped rubber ring, fixedly installed in the holder installation groove of the electrode installation part. An engaging tooth is also provided inside the ring-shaped rubber ring. The friction force of the electrode holder is further improved through mechanical engagement. At the same time, the electrode holder and the outer wall of the telescopic electrode are installed by interference fit, so that the telescopic electrode can be stably installed in the electrode holder and will not fall off easily. At the same time, medical staff can easily pull out the telescopic electrode for replacement with a little force during use. The electrode holder does not affect the electrode replacement while providing sufficient insertion and extraction force, improving the reliability of electrode replacement and increasing the efficiency of electrode replacement.

[0010] Preferably, a PCB board is provided inside the pen body. The PCB board is arranged above the conductive tube. A conductive installation groove is provided on the PCB board. The PCB board and the conductive tube are fixedly connected and conducted through a conductive connector. The current on the PCB board is transmitted to the conductive tube below through the conductive connector. Since the conductive tube and the telescopic electrode are of a split structure, the extraction and replacement of the telescopic electrode will not affect the internal structure change of the electrosurgical pen, and the current on the conductive tube can be transmitted to the telescopic electrode, realizing that the electrosurgical pen can not only work normally for electrocision and electrocoagulation, but also realize the telescoping, insertion and extraction replacement of the electrode without changing the internal structure.

[0011] Preferably, the conductive connector is of a hoop clamping or crimping clamping structure, including a square clamping end and a circular clamping end. The square clamping end is clamped and fixed with the conductive installation groove, and the square clamping end can also be fixed on the PCB board through a rivet structure. The circular clamping end is clamped and fixed with the outer wall of the conductive tube. The current on the PCB board is transmitted to the conductive tube through the conductive connector and finally transmitted to the telescopic electrode and the cutter head. The conductive tube not only has a conductive function, but also can provide a guiding function for the telescopic electrode when the telescopic electrode is inserted into the pen body, so that the electrode will not deviate. The conductive connector uses a hoop clamping structure. The square clamping end above the conductive connector is fixedly connected with the PCB board, and the circular clamping end below is a circular hoop design. Since the conductive connector is made of elastic conductive material, the elastic force provided by the hoop can clamp and fix the conductive tube. At the same time, the conductive connector can also connect the PCB board and the conductive tube, enabling the current to be transmitted smoothly.

[0012] Preferably, a pluggable and replaceable cutting head can be further installed on the electrode mounting portion of the pen body. The pluggable cutting head includes a pluggable connector and a pluggable electrode. The pluggable electrode is fixedly installed on the pluggable connector, and the pluggable connector is installed on the electrode mounting portion through the electrode fixator. In addition to being able to install a replaceable telescopic electrode, the electrosurgical pen can also install a cutting head that does not need to be telescopic and needs to be fixed during use. The pluggable electrode on the pluggable cutting head is fixedly installed on the pluggable connector, and a cutting head for surgery is also installed at the head of the pluggable electrode. The electrosurgical pen can replace the telescopic electrode and the fixed pluggable electrode at the same time, or replace the cutting head, without the need to replace the entire surgical instrument like a traditional electrosurgical pen, which can quickly adapt to a complex surgical environment, make the surgical process smoother, and improve the surgical efficiency.

[0013] Preferably, a pen body stopping portion for preventing the rotation of the pluggable cutting head is further provided on the electrode mounting portion. The pen body stopping portion is a keyway stopping or stopping plane stopping structure, and a connector stopping portion corresponding to the structure of the pen body stopping portion is further provided on the pluggable connector; a cutting head that does not rotate is required during the surgical process. A connector stopping portion is provided on the pluggable connector, and the inner hexagonal plane is used as the stopping plane to prevent the pluggable cutting head from rotating after being installed on the pen body of the electrosurgical pen, making the electrosurgical pen more reliable during the surgical process and the surgical process more accurate and efficient.

[0014] Preferably, the cross-sectional diameter of the plug-and-play electrode is smaller than that of the telescopic electrode. An elastic pressing piece facing one end of the electrode mounting portion is further provided on the square clamping end of the conductive connector. The portion where the elastic pressing piece is connected to the square clamping end is a straight-edge connection end, and the end far from the square clamping end is an arc pressing piece end. The arc pressing piece end can be bent and deformed under the pressure of the pen body housing to contact the plug-and-play electrode, so that the current of the PCB board can reach the plug-and-play electrode through the elastic pressing piece; the plug-and-play electrode is fixedly installed in the plug-and-play connector and inserted into the pen body. The telescopic electrode is directly inserted into the pen body. Therefore, the diameter of the plug-and-play electrode is smaller than that of the telescopic electrode, resulting in that the plug-and-play electrode cannot directly contact the conductive tube, so the current on the conductive tube cannot be transmitted to the plug-and-play electrode; however, an elastic pressing piece extending outward is provided at one end of the conductive connector facing the electrode. The elastic pressing piece is made of beryllium copper, a conductive material with good elastic performance. When the plug-and-play electrode is inserted into the pen body, the arc pressing piece end at one end of the elastic pressing piece will contact and deform under the extrusion of the plug-and-play electrode, so that the arc pressing piece end always firmly contacts the plug-and-play electrode. The current on the PCB board can be transmitted to the plug-and-play electrode through the elastic pressing piece on the conductive connector, enabling the plug-and-play electrode to work properly; and because the arc pressing piece end of the elastic pressing piece has strong elastic performance, when the thicker telescopic electrode is inserted, the elastic pressing piece will only deform more and will not interfere with the installation of the telescopic electrode, improving the versatility of the pen body of the electrosurgical pen and making the adaptability of the electrosurgical pen better.

[0015] In summary, the beneficial effects of the present invention are as follows: 1. For the electrosurgical pen capable of simultaneously telescoping and replacing the knife head according to the present invention, both a telescopic electrode and a plug-and-play fixed electrode can be replaced on the pen body of the electrosurgical pen, and the type of the knife head can also be selected. The operation is convenient, and the electrodes and knife heads of the electrosurgical pen can be replaced quickly. There is no need to replace the entire surgical instrument like a traditional electrosurgical pen, and it can be quickly adapted to a complex surgical environment, making the surgical process more streamlined and improving the surgical efficiency. 2. For the electrosurgical pen capable of simultaneously telescoping and replacing the knife head according to the present invention, an electrode fixator is installed on the electrode mounting portion of the pen body of the electrosurgical pen. The electrode fixator is made of a rubber ring with a relatively high coefficient of friction, and engaging teeth for further increasing the friction are also provided inside the rubber ring. After the telescopic electrode and the plug-and-play electrode are installed on the electrode fixator, they will not fall off easily. The electrode fixator provides sufficient insertion and extraction force and does not affect the electrode replacement, improving the reliability of the electrode replacement and use while increasing the efficiency of the electrode replacement. 3. For the electric scalpel pen capable of simultaneous telescoping and cutter head replacement according to the present invention, a conductive tube is provided inside the pen body. The conductive tube is fixedly connected to the PCB board through a conductive connector, and the telescopic electrode directly contacts the inner wall of the conductive tube, enabling the high-frequency current on the PCB board to be transmitted to the telescopic electrode. Since the conductive tube and the telescopic electrode have a separable structure, the extraction and replacement of the telescopic electrode will not affect the internal structure change of the electric scalpel pen, realizing that the electric scalpel pen can not only work normally but also achieve the telescoping and plugging replacement of the electrode without changing the internal structure. 4. For the electric scalpel pen capable of simultaneous telescoping and cutter head replacement according to the present invention, an elastic pressing piece extending outward is provided at one end of the conductive connector facing the electrode. The diameter of the pluggable electrode is smaller than that of the telescopic electrode and cannot directly contact the conductive tube. Therefore, the arc pressing end of the elastic pressing piece is designed to contact and deform under the extrusion of the pluggable electrode, making the arc pressing end always firmly contact the pluggable electrode, enabling the pluggable electrode to work normally. And after the telescopic electrode is inserted, the elastic pressing piece will only deform more and will not interfere with the installation of the telescopic electrode, improving the versatility of the pen body of the electric scalpel pen and making the adaptability of the electric scalpel pen better. 5. For the electric scalpel pen capable of simultaneous telescoping and cutter head replacement according to the present invention, a pen body stop portion is further provided on the electrode installation portion of the pen body, which can cooperate with the connector stop portion on the pluggable cutter head, so that the cutter head will not rotate during use, can be better applied to some special surgical situations, making the electric scalpel pen more reliable during the surgical process and the surgical process more accurate and efficient. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the internal structure of the electric scalpel pen of the present invention; Figure 2 is a schematic diagram of the overall structure of the electric scalpel pen of the present invention; Figure 3 is a schematic diagram of the structure of the electrode installation portion of the present invention; Figure 4 is a schematic diagram of the connection structure between the telescopic electrode and the conductive tube of the present invention; Figure 5 is a schematic diagram of the structure of the telescopic electrode of the present invention; Figure 6 is a schematic diagram of the structure of the electrode holder of the present invention; Figure 7 is a schematic diagram of the structure of the conductive connector of the present invention; Figure 8 is a schematic diagram of the structure of the conductive connector with a downward pressing contact end of the present invention; Figure 9 is a schematic diagram of the connection structure of the conductive connector of the present invention; Figure 10It is a schematic diagram of the internal structure of the electric scalpel pen with a pluggable blade head of the present invention; Figure 11 It is a schematic diagram of the installation structure of the pluggable blade head of the present invention.

[0017] Markings in the figure: 1 - pen body, 11 - electrode installation part, 12 - holder installation groove, 13 - pen body stop part, 14 - conductive tube, 15 - PCB board, 16 - conductive installation groove, 2 - telescopic electrode, 21 - electrode insulation layer, 22 - temperature measurement sensor, 3 - blade head, 31 - blade edge, 4 - electrode holder, 41 - engaging teeth, 5 - conductive connector, 51 - square connector end, 52 - annular connector end, 53 - elastic pressing piece, 531 - straight edge connection end, 532 - arc pressing piece end, 54 - downward pressing contact end, 6 - pluggable blade head, 61 - pluggable connector, 62 - pluggable electrode, 63 - connector stop part. Specific embodiments

[0018] The following specific embodiments are only explanations of the present invention and are not limitations thereof. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs 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.

[0019] The present invention will be described in detail below with reference to the accompanying drawings by way of examples.

[0020] Embodiment 1

[0021] According to Figures 1 to 3 As shown, an electric scalpel pen capable of simultaneously telescoping and replacing the blade head includes a pen body 1, a telescopic electrode 2, and a blade head 3. The pen body 1 is provided with an electrode installation part 11 at the position where the telescopic electrode 2 is installed. A holder installation groove 12 is opened on the electrode installation part 11. The electrode holder 4 is arranged in the holder installation groove 12. The telescopic electrode 2 is installed inside the pen body 1 through the electrode holder 4 and extends out. The blade head 3 is arranged at the head of the telescopic electrode 2; the telescopic electrode 2 of the electric scalpel pen can be extended and shortened according to the depth of the surgical site, and the blade head 3 can also be replaced with other heads of different shapes and different length dimensions as needed. Both the telescopic electrode 2 and the blade head 3 of the electric scalpel pen can be replaced.

[0022] According to Figure 1As shown, a conductive tube 14 is provided inside the pen body 1. The conductive tube 14 has a hollow structure. The outer wall of the electrode of the telescopic electrode 2 is in direct contact with the inner wall of the conductive tube 14. After the electrosurgical pen is powered on, the current reaches the conductive tube 14 and can be transmitted to the telescopic electrode 2 through the conductive tube 14. The conductive tube 14 of the electrosurgical pen can receive the high-frequency current transmitted from the PCB board 15. The diameter of the telescopic electrode 2 is thicker than that of the plug-and-play electrode 62. The telescopic electrode 2 is inserted into the conductive tube 14 after passing through the electrode holder 4, and the outer wall of the telescopic electrode 2 can directly contact the inner wall of the conductive tube 14, making the conduction of the current smoother.

[0023] According to Figure 1 、 Figure 5 As shown, an electrode insulating layer 21 is also provided on the electrode of the telescopic electrode 2 extending outside the pen body 1. The electrode insulating layer 21 directly extends 2 - 10 mm from the head of the telescopic electrode 2. The electrode part of the telescopic electrode 2 extending outside the pen body 1 is also coated with the electrode insulating layer 21, which can prevent the doctor from being scalded by the high-frequency current when accidentally touching the electrode during the operation, ensuring the safety of the medical staff's operation and improving the accuracy of the operation at the same time.

[0024] According to Figure 5 As shown, the edge size of the blade 31 of the knife head 3 is 0.05 - 0.1 mm. When the electrosurgical pen is not started during clinical use, the knife head 3 will not cut the skin because it is too sharp. The design of the size of the blade 31 of the knife head 3 can make the discharge of the knife head 3 more concentrated, so that electrosection and electrocoagulation of the operation can be achieved under low-power conditions. A temperature sensor 22 is also provided at the position of the telescopic electrode 2 close to the knife head 3, which can collect the temperature of the cutting area in real time when the electrosurgical pen is cutting. The design of the size of the blade 31 of the knife head 3 makes the knife head 3 sharp but not too sharp. When the medical staff accidentally touches the blade 31, the skin will not be scratched by the blade 31. At the same time, the design of the blade 31 of the knife head 3 can make the discharge of the knife head 3 of the electrosurgical pen more concentrated, so as to achieve electrosection and electrocoagulation of the operation process with a lower current power. And the low power causes less damage to the patient, and the patient's postoperative recovery time is faster, greatly reducing the pain of the patient after the operation. At the same time, a temperature sensor 22 is also provided at the position of the electrode close to the knife head 3, which can monitor the temperature of the wound in real time throughout the operation process, ensure that the temperature of the operation process is controlled within the specified range, avoid secondary damage to the patient caused by thermal damage or carbonization of biological tissue due to high temperature, and improve the safety and accuracy of the operation process.

[0025] According to Figure 1 、 Figure 6As shown, the electrode holder 4 is designed as a ring-shaped rubber ring structure and is made of silicone material with a relatively high coefficient of friction. A number of engaging teeth 41 are provided on the inner wall of the electrode holder 4. The electrode holder 4 and the telescopic electrode 2 are installed with an interference fit. The electrode holder 4 can provide sufficient insertion and extraction force for the telescopic electrode 2 while ensuring the stability of the tool tip and the telescopic electrode and being compatible with tool tips and telescopic electrodes of different diameters. The electrode holder 4 is a ring-shaped rubber ring and is fixedly installed in the holder installation groove 12 of the electrode installation part 11. The engaging teeth 41 are also provided inside the ring-shaped rubber ring. The friction force of the electrode holder 4 is further improved through mechanical engagement. At the same time, the electrode holder 4 and the outer wall of the telescopic electrode 2 are installed with an interference fit, so that the telescopic electrode 2 can be stably installed in the electrode holder 4 and will not fall off easily. At the same time, medical staff can easily pull out and replace the telescopic electrode 2 with a little force during use. The electrode holder 4 does not affect the electrode replacement while providing sufficient insertion and extraction force, improving the reliability of electrode replacement and increasing the efficiency of electrode replacement.

[0026] According to Figure 4 As shown, a PCB board 15 is provided inside the pen body 1. The PCB board 15 is arranged above the conductive tube 14. A conductive installation groove 16 is opened on the PCB board 15. The PCB board 15 and the conductive tube 14 are fixedly connected and conducted through a conductive connector 5. The current on the PCB board 15 is transmitted to the conductive tube 14 below through the conductive connector 5. Since the conductive tube 14 and the telescopic electrode 2 are of a split structure, the extraction and replacement of the telescopic electrode 2 will not affect the internal structure change of the electrosurgical pen. And the current on the conductive tube 14 can be transmitted to the telescopic electrode 2, realizing that the electrosurgical pen can not only work normally for electrocision and electrocoagulation, but also realize the telescopic and plug-and-play replacement of the electrode without changing the internal structure.

[0027] According to Figure 7 、 Figure 8As shown, the conductive connector 5 is a hoop clamping or crimping clamping structure, including a square clamping end 51 and a circular clamping end 52. The square clamping end 51 is clamped and fixed to the conductive mounting groove 16, and the square clamping end 51 can also be fixed to the PCB board 15 through a rivet structure. The circular clamping end 52 is clamped and fixed to the outer wall of the conductive tube 14. The circular clamping end 52 can also be replaced by a downward pressing contact end 54 of the downward pressing contact type. The downward pressing contact end 54 contacts the conductive tube 14 through its elastic pressing piece structure. The current on the PCB board 15 is transmitted to the conductive tube 14 through the conductive connector 5 and finally transmitted to the telescopic electrode 2 and the cutter head 3. The conductive tube 14 not only has a conductive function, but also can provide a guiding function for the telescopic electrode 2 when the telescopic electrode 2 is inserted into the pen body 1, so that the electrode will not deviate. The conductive connector 5 uses a hoop clamping structure. The square clamping end 51 above the conductive connector 5 is fixedly connected to the PCB board 15, and the circular clamping end 52 below is a circular hoop design. Since the conductive connector 5 is made of an elastic conductive material, the elastic force provided by the hoop can clamp and fix the conductive tube 14, and at the same time, the conductive connector 5 can also connect the PCB board 15 and the conductive tube 14, so that the current can be transmitted smoothly.

[0028] Embodiment 2

[0029] The difference from the above Embodiment 1 is that according to Figure 10 As shown, a pluggable and replaceable plug-in cutter head 6 can also be installed on the electrode mounting portion 11 of the pen body 1. The plug-in cutter head 6 includes a plug-in connector 61 and a plug-in electrode 62. The plug-in electrode 62 is fixedly installed on the plug-in connector 61, and the plug-in connector 61 is installed on the electrode mounting portion 11 through an electrode holder 4. In addition to installing a replaceable telescopic electrode 2, the electrosurgical pen can also install a plug-in cutter head that does not need to be telescopic and needs to be fixed during use. The plug-in electrode 62 on the plug-in cutter head 6 is fixedly installed on the plug-in connector 61, and a cutter head 3 for surgery is also installed at the head of the plug-in electrode 62. The electrosurgical pen can replace both the telescopic electrode and the fixed plug-in electrode 62 at the same time, or replace the cutter head 3. It does not need to replace the entire surgical instrument like a traditional electrosurgical pen, can quickly adapt to a complex surgical environment, make the surgical process smoother, and improve the surgical efficiency.

[0030] According to Figure 3 、 Figure 11As shown, a pen body stop portion 13 for preventing the plug-in cutter head 6 from rotating is further provided on the electrode mounting portion 11. The pen body stop portion 13 is a keyway stop or a stop plane stop structure, and a connector stop portion 63 corresponding to the structure of the pen body stop portion 13 is further provided on the plug-in connector 61; during the operation, a non-rotating cutter head is required. A connector stop portion 63 is provided on the plug-in connector 61, and the inner hexagonal plane is used as the stop plane to prevent the plug-in cutter head 6 from rotating after being installed on the pen body 1 of the electrosurgical pen, making the electrosurgical pen more reliable and the operation process more accurate and efficient during the operation.

[0031] According to Figure 10 、 Figure 11 As shown, the cross-sectional diameter of the plug-in electrode 62 is smaller than that of the telescopic electrode 2. An elastic pressing piece 53 extending toward one end of the electrode mounting portion 11 is further provided on the square clamping end 51 of the conductive clamping connector 5. The portion where the elastic pressing piece 53 is connected to the square clamping end 51 is a straight-edge connecting end 531, and the end far from the square clamping end 51 is an arc pressing piece end 532. The arc pressing piece end 532 can be bent and deformed under the pressure of the pen body 1 housing and contact the plug-in electrode 62, so that the current of the PCB board 15 can reach the plug-in electrode 62 through the elastic pressing piece 53; the plug-in electrode 62 is fixedly installed in the plug-in connector 61 and then inserted into the pen body 1, while the telescopic electrode 2 is directly inserted into the pen body 1. Therefore, the diameter size of the plug-in electrode 62 is smaller than that of the telescopic electrode 2, resulting in that the plug-in electrode 62 cannot directly contact the conductive tube 14, so the current on the conductive tube 14 cannot be transmitted to the plug-in electrode 62; however, an elastic pressing piece 53 extending outward is provided at one end of the conductive clamping connector 5 facing the electrode. The elastic pressing piece 53 is made of beryllium copper, a conductive material with good elastic performance. When the plug-in electrode 62 is inserted into the pen body 1, the arc pressing piece end 532 at one end of the elastic pressing piece 53 will contact and deform under the extrusion of the plug-in electrode 62, so that the arc pressing piece end 532 is always firmly in contact with the plug-in electrode 62. The current on the PCB board 15 can be transmitted to the plug-in electrode 62 through the elastic pressing piece 53 on the conductive clamping connector 5, enabling the plug-in electrode 62 to work normally; and because the arc pressing piece end 532 of the elastic pressing piece 53 has strong elastic performance, when the thicker telescopic electrode 2 is inserted, the elastic pressing piece 53 will only deform more and will not interfere with the installation of the telescopic electrode 2, improving the versatility of the pen body 1 of the electrosurgical pen and making the adaptability of the electrosurgical pen better.

Claims

1. An electric knife pen capable of simultaneously extending and replacing the knife head, characterized in that: The invention comprises a pen body (1), a telescopic electrode (2) and a knife head (3); the pen body (1) is provided with an electrode mounting portion (11) at a position where the telescopic electrode (2) is mounted; the electrode mounting portion (11) is provided with a holder mounting groove (12); an electrode holder (4) is arranged in the holder mounting groove (12); the telescopic electrode (2) is mounted inside the pen body (1) through the electrode holder (4) and extends out; the knife head (3) is arranged at the head of the telescopic electrode (2); the telescopic electrode (2) of the electrosurgical pen can be extended or shortened according to the depth of the surgical site; the knife head (3) can also be replaced with other heads of different shapes and different lengths as required; both the telescopic electrode (2) and the knife head (3) of the electrosurgical pen are replaceable.

2. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 1, characterized in that: A conductive tube (14) is arranged inside the pen body (1); the conductive tube (14) is a hollow structure; the outer wall of the telescopic electrode (2) is in direct contact with the inner wall of the conductive tube (14); after the electric knife pen is powered on, the current reaches the conductive tube (14) and can be transferred to the telescopic electrode (2) through the conductive tube (14).

3. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 1, characterized in that: An electrode insulating layer (21) is also provided on the electrode of the telescopic electrode (2) extending outside the pen body (1); the length of the electrode insulating layer (21) directly extending from the head of the telescopic electrode (2) is 2-10 mm.

4. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 3, characterized in that: The edge size of the blade (31) of the knife head (3) is 0.05-0.1 mm. When the electric knife pen is not activated during clinical use, the knife head (3) will not cut the skin due to being too sharp. The design of the size of the blade (31) of the knife head (3) can make the discharge of the knife head (3) more concentrated, so that surgical electrocoagulation can be achieved under low-power conditions. The telescopic electrode (2) is also provided with a temperature sensor (22) at a position close to the knife head (3), so that the temperature of the cut part can be collected in real time when the electric knife pen is cutting.

5. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 1, characterized in that: The electrode holder (4) is designed as an annular rubber ring structure and is made of a silicone material with a high friction coefficient. A plurality of engaging teeth (41) are arranged on the inner wall of the electrode holder (4). The electrode holder (4) and the telescopic electrode (2) are installed by interference fit. The electrode holder (4) can provide sufficient insertion and extraction force for the telescopic electrode (2) while ensuring the stability of the cutter head and the telescopic electrode and is compatible with cutter heads and telescopic electrodes of different diameters.

6. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 2, characterized in that: A PCB board (15) is arranged inside the pen body (1), the PCB board (15) is arranged on the conductive tube (14), a conductive mounting groove (16) is provided on the PCB board (15), and the PCB board (15) and the conductive tube (14) are fixedly connected and conductively connected via a conductive connector (5).

7. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 6, characterized in that: The conductive clamp (5) is a clamping or pressing clamping structure, comprising a square clamping end (51) and an annular clamping end (52); the square clamping end (51) is clamped and fixed to the conductive mounting groove (16); the square clamping end (51) can also be fixed to the PCB board (15) by a rivet structure; the annular clamping end (52) is clamped and fixed to the outer wall of the conductive tube (14); the annular clamping end (52) can also be replaced by a downward pressing contact end (54); the downward pressing contact end (54) contacts the conductive tube (14) through its elastic pressing sheet structure; the current on the PCB board (15) is transmitted to the conductive tube (14) through the conductive clamp (5) and finally transmitted to the telescopic electrode (2) and the cutter head (3).

8. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 7, characterized in that: A pluggable and replaceable insertable blade head (6) may also be mounted on the electrode mounting portion (11) of the pen body (1); the pluggable blade head (6) comprises a pluggable connector (61) and a pluggable electrode (62); the pluggable electrode (62) is fixedly mounted on the pluggable connector (61); and the pluggable connector (61) is mounted on the electrode mounting portion (11) via the electrode holder (4).

9. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 8, characterized in that: The electrode mounting portion (11) is also provided with a pen body stop portion (13) for preventing the plug-in blade head (6) from rotating; the pen body stop portion (13) is a keyway stop or a stop plane stop structure; and the plug-in connector (61) is also provided with a connector stop portion (63) corresponding to the structure of the pen body stop portion (13).

10. The electric knife pen capable of simultaneously extending and replacing the knife head according to claim 9, characterized in that: The cross-sectional diameter of the plug-in electrode (62) is smaller than the cross-sectional diameter of the telescopic electrode (2); the square clamping end (51) of the conductive clamping device (5) is further provided with an elastic pressing piece (53) extending toward one end of the electrode mounting portion (11); the portion where the elastic pressing piece (53) is connected to the square clamping end (51) is a straight-edge connecting end (531); the end away from the square clamping end (51) is an arc pressing piece end (532); the arc pressing piece end (532) can bend and deform under the pressure of the pen body (1) shell and contact the plug-in electrode (62), so that the current of the PCB board (15) can pass through the elastic pressing piece (53) to reach the plug-in electrode (62).

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