A surgical based incision knife cut distance measuring device

Abstract

This invention discloses a surgical cutting distance measuring device, including a scalpel comprising a blade and a handle. The blade is mounted on one end of the handle, which contains a mounting cavity. A distance measuring element is mounted on the handle and includes a distance measuring wheel, a fixing frame, and a driving component. Two distance measuring wheels are provided and located on both sides of the handle. The fixing frame, driving component, and distance measuring circuit are all located within the mounting cavity. A fixed shaft for mounting the distance measuring wheels is rotatably mounted on the fixing frame. During surgery, the rotation of the distance measuring wheels causes the driving component to rotate synchronously, causing a fixed conductive rod to sequentially contact multiple movable conductive rods to control the on / off state of the distance measuring circuit. An on / off counter records the number of on / off cycles, and finally, a data calculation module calculates the cutting length and displays it in real time on a monitor. This provides great convenience for doctors during surgery.

Description

Technical Field

[0001] This invention discloses a surgical incision distance measurement device, belonging to the field of surgical instrument technology. Background Technology

[0002] A scalpel typically consists of a blade and a handle. The blade usually has a cutting edge and a mounting groove for engaging with the handle. It is typically made of pure titanium, titanium alloy, stainless steel, or carbon steel and is generally disposable. During dissection, the blade is used to cut through skin and muscle, the tip is used to clean blood vessels and nerves, and the handle is used for blunt dissection. The appropriate blade and handle size must be selected based on the size of the wound. During surgery, the length of the incision depends entirely on the surgeon's skill and experience; precise control of the blade's cutting length is difficult. A short cut can hinder the continuation of the surgery, while a long cut may increase suturing time and also increase patient discomfort. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art and to provide a surgical incision distance measurement device.

[0004] This invention achieves the above objective through the following technical solution: a surgical incision distance measuring device, comprising:

[0005] A scalpel, comprising a blade and a handle, wherein the blade is mounted at one end of the handle and a mounting cavity is provided within the handle;

[0006] A ranging element is mounted on a tool holder and includes a ranging wheel, a fixing frame, and a driving component. Two ranging wheels are provided and located on both sides of the tool holder. The fixing frame, the driving component, and the ranging circuit are all located in the mounting cavity. A fixing shaft for mounting the ranging wheel is rotatably mounted on the fixing frame. The driving component is mounted on the fixing shaft and rotates synchronously with the ranging wheel when it rotates.

[0007] The ranging circuit includes a power module, a movable switch, an on / off counter, and a processor. The power module is coupled to the on / off counter and the processor, and supplies power to both. The movable switch includes a fixed conductive rod and a movable conductive rod. The fixed conductive rod is mounted on a mounting frame. Multiple movable conductive rods are arranged in a circumferential array on the driving component. The movable and fixed conductive rods are coupled to the on / off counter and the power module. During the rotation of the driving component, when the movable conductive rod contacts the fixed conductive rod, the on / off counter is energized and increments the energization count. When the fixed conductive rod is between two adjacent movable conductive rods, the on / off counter is de-energized. The processor includes a transmission module and a data calculation module. The data calculation module receives the energization count signal from the on / off counter and multiplies this signal by the distance between the two movable conductive rods to obtain the rotation length A of the ranging wheel. Length A is the cutting length of the blade.

[0008] A display, which is coupled to the transmission module, is used to display length A.

[0009] Preferably, the driving component includes a first gear, a second gear, and a rotating shaft. The first gear is mounted on a fixed shaft, the rotating shaft is rotatably mounted on a fixed frame, and one end of the rotating shaft has a first limiting part that cooperates with the second gear. The movable conductive rod is mounted on the second gear, the second gear has fewer teeth than the first gear, and the two mesh and transmit power.

[0010] Preferably, the second gear is provided with a groove, and a cover for covering the groove is provided on the side of the second gear. The cover is provided with a protrusion that is rotatably connected to the fixed frame, and the cover is fixedly connected to the second gear by bolts. The movable conductive rod has a stepped shaft structure, with its larger diameter end embedded in the second gear and its smaller diameter end passing through the cover. A conductor is provided on the inner side of the rotating shaft. One end of the conductor extends into the groove, and the other end passes through the rotating shaft and extends to the outside of the fixed frame. A conductive connector with an umbrella-shaped structure is provided between the conductor and the multiple movable conductive rods. The conductor and the fixed conductive rod are coupled to the on / off counter and the power module through wires.

[0011] Preferably, a one-way transmission component is provided between the rotating shaft and the fixed frame. The one-way transmission component includes a rotating disk, a wedge block, a limiting bolt, and a first spring. The rotating disk is fixed on the rotating shaft, and multiple slots are arranged in an array on the rotating disk. The slots have a guide slope and a blocking surface. One end of the limiting bolt passes through the fixed frame and is fixedly connected to the wedge block. The first spring is sleeved on the outside of the limiting bolt and applies an abutment force to the wedge block against the slot.

[0012] Preferably, the fixing frame includes a first mounting plate and a second mounting plate. The first mounting plate is L-shaped, and the second mounting plate is provided with a plurality of support columns. The first mounting plate is fixedly connected to the support columns by bolts.

[0013] Preferably, the fixing frame is slidably disposed in the mounting cavity, the tool handle is provided with a groove for the fixed shaft to slide, the tool handle is provided with a base plate for covering the mounting cavity, and the lowest point of the measuring wheel is lower than the extension line of the blade cutting position.

[0014] Preferably, the ranging circuit further includes a varistor and a NOT gate logic circuit. The varistor is mounted on the base plate and coupled to the power module. The NOT gate logic circuit is coupled to the varistor and the data calculation module. A second spring is provided in the mounting cavity to keep the fixing frame in contact with the varistor. A positioning post is provided on the fixing frame to position the second spring. The display can display at least two sets of lengths A1 and A2. Length A1 is the distance cut by the first blade, and length A2 is the distance cut by the second blade. When the fixing frame contacts the varistor, the output of the NOT gate logic circuit outputs a low level to control the data calculation module to clear length A1 to zero. When the fixing frame is no longer in contact with the varistor, the output of the NOT gate logic circuit outputs a high level to control the data calculation module to record the third cutting length A3.

[0015] Preferably, the tool holder is provided with a control switch, which is coupled to the power module and used to control the power supply to the ranging circuit.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By setting up a ranging element, a ranging circuit, and a display, during the operation, the rotation of the ranging wheel causes the drive component to rotate synchronously, and the fixed conductive rod contacts multiple movable conductive rods in sequence to control the power on and off of the ranging circuit. The power on / off counter records the number of times the circuit is switched on and off, and finally the data calculation module calculates the cutting length and displays it in real time on the display. This provides great convenience for doctors to perform surgery and can reduce the pain of surgery for patients. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a surgical incision distance measuring device according to the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the fixing bracket inside the tool holder in this invention;

[0020] Figure 3 This is a schematic diagram of the tool holder disassembly distance measuring wheel in this invention;

[0021] Figure 4 This is a schematic diagram of the ranging element in this invention;

[0022] Figure 5 This is a schematic diagram of the structure of the second gear, the fixed conductive rod, and the movable conductive rod in this invention;

[0023] Figure 6 This is a schematic diagram of the unidirectional transmission component and the rotating shaft in this invention;

[0024] Figure 7 This is a schematic diagram of the cap structure in this invention;

[0025] Figure 8 This is a partial structural diagram of the ranging circuit in this invention;

[0026] Figure 9 This is a circuit diagram of the ranging circuit in this invention;

[0027] Reference numerals: 1. Blade; 2. Measuring wheel; 3. Handle; 4. Measuring circuit; 5. Control switch; 6. Mounting cavity; 7. Fixing frame; 8. Measuring element; 9. Base plate; 10. Fixed shaft; 11. Slide groove; 12. Second mounting plate; 13. Support column; 14. First mounting plate; 15. First gear; 16. Second gear; 17. Power module; 18. Second spring; 19. Positioning column; 20. Rotating shaft; 21. One-way transmission component; 22. Cover; 23. Protrusion 24. Column; 25. Sink; 26. Conductor; 27. Rotating disk; 28. Movable conductive rod; 29. ​​Conductive connector; 30. First limiting part; 31. Slot; 32. Guide slope; 33. Blocking surface; 34. First spring; 35. Limiting bolt; 36. Wedge block; 37. Transmission module; 38. Data calculation module; 39. NOT gate logic circuit; 40. Varistor; 41. Processor; 42. On / off counter; 43. Display; 44. Fixed conductive rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1-9 As shown, a surgical incision distance measuring device includes:

[0030] The scalpel includes a blade 1 and a handle 3. The blade 1 is mounted on one end of the handle 3, and a mounting cavity 6 is provided inside the handle 3.

[0031] The ranging element 8 is mounted on the tool holder 3 and includes a ranging wheel 2, a fixing frame 7 and a driving component. There are two ranging wheels 2, located on both sides of the tool holder 3. The fixing frame 7, the driving component and the ranging circuit 4 are all located in the mounting cavity 6. A fixing shaft 10 for mounting the ranging wheel 2 is rotatably mounted on the fixing frame 7. The driving component is mounted on the fixing shaft 10 and rotates synchronously when the ranging wheel 2 rotates.

[0032] The ranging circuit 4 includes a power module 17, a movable switch, an on / off counter 41, and a processor 40. The power module 17 is coupled to the on / off counter 41 and the processor, and supplies power to both. The movable switch includes a fixed conductive rod 43 and a movable conductive rod 27. The fixed conductive rod 43 is mounted on a mounting bracket 7. Multiple movable conductive rods 27 are arranged in a circumferential array on the driving component. The movable conductive rods 27 and the fixed conductive rods 43 are coupled to the on / off counter 41 and the power module 17. During the rotation of the driving component, when the movable conductive rod 27 is activated... When the conductive rod 27 contacts the fixed conductive rod 43, the on / off counter 41 is in the energized state and increments the energization count by one. When the fixed conductive rod 43 is located between two adjacent movable conductive rods 27, the on / off counter 41 is in the de-energized state. The processor 40 includes a transmission module 36 and a data calculation module 37. The data calculation module 37 is used to receive the energization count signal of the on / off counter 41 and multiply the signal by the distance between the two movable conductive rods 27 to obtain the rotation length A of the measuring wheel 2. The length A is the cutting length of the blade 1.

[0033] Display 42 is coupled to transmission module 36 and is used to display length A.

[0034] The driving component includes a first gear 15, a second gear 16, and a rotating shaft 20. The first gear 15 is mounted on a fixed shaft 10, and the rotating shaft 20 is rotatably mounted on a fixed frame 7. One end of the rotating shaft 20 has a first limiting part 29 that cooperates with the second gear 16. A movable conductive rod 27 is mounted on the second gear 16. The number of teeth of the second gear 16 is less than the number of teeth of the first gear 15, and the two mesh and transmit power. By controlling the transmission ratio of the first gear 15 and the second gear 16 and the distance between the two movable conductive rods 27, the distance that the measuring wheel 2 moves is equal to the distance that the movable conductive rod 27 moves. In this way, the cutting length of the blade 1 can be directly displayed on the display 42, thereby simplifying the measurement and calculation.

[0035] The second gear 16 is provided with a recess 24, and a cover 22 for covering the recess 24 is provided on the side of the second gear 16. The cover 22 is provided with a protrusion 23 that is rotatably connected to the fixing frame 7, and the cover 22 is fixedly connected to the second gear 16 by bolts. The movable conductive rod 27 has a stepped shaft structure, with its larger diameter end embedded in the second gear 16 and its smaller diameter end passing through the cover 22. A conductor 25 is provided on the inner side of the rotating shaft 20. One end of the conductor 25 extends into the recess 24, and the other end passes through the rotating shaft 20 and extends to the outer side of the fixing frame 7. A conductive connector 28 with an umbrella-shaped structure is provided between the conductor 25 and the multiple movable conductive rods 27. The electric conductor 25 is coupled to the fixed conductive rod 43 via wires to the on / off counter 41 and the power module 17. When the measuring wheel 2 rotates, it can drive the fixed shaft 10 and the first gear 15 to rotate synchronously. The first gear 15 then drives the second gear 16 to rotate, causing multiple movable conductive rods 27 to rotate synchronously with the second gear 16. In this way, multiple movable conductive rods 27 will contact the fixed conductive rod 43 in turn during rotation. Thus, the circuit connected to the on / off counter 41 will be in an alternating state of being energized and de-energized. The on / off counter 41 will record the number of times the power is energized and transmit it to the data calculation module 37, thereby preparing for the subsequent calculation of the cutting length of the blade 1.

[0036] A one-way transmission component 21 is provided between the rotating shaft 20 and the fixed frame 7. The one-way transmission component 21 includes a rotating disk 26, a wedge block 35, a limiting bolt 34, and a first spring 33. The rotating disk 26 is fixed on the rotating shaft 20, and multiple slots 30 are arranged in an array on the rotating disk 26. Each slot 30 has a guide slope 31 and a blocking surface 32. One end of the limiting bolt 34 passes through the fixed frame 7 and is fixedly connected to the wedge block 35. The first spring 33 is sleeved on the outside of the limiting bolt 34 and applies a force to the wedge block 35 against the slot 30. When the wedge block 35 and the slot 30 are engaged, they can move by relying on the guide slope 31. 1. Relative sliding occurs, causing the rotating disk 26 to rotate in one direction. When the blocking surface 32 restricts the rotating disk 26 from rotating in the opposite direction, during surgery, when the blade 1 cuts the muscle tissue in one direction, the rotation of the measuring wheel 2 is not restricted, but the directional rotation of the measuring wheel 2 is restricted by the blocking surface 32. At the same time, the elastic force applied by the first spring 33 to the wedge block 35 causes the rotation of the rotating disk 26 to be subject to a certain resistance. This can prevent the blade 1 from moving in the opposite direction to cut or from affecting the measurement of the cutting length after the cutting is completed during the operation, so as to avoid interference with the measurement results.

[0037] The mounting bracket 7 includes a first mounting plate 14 and a second mounting plate 12. The first mounting plate 14 is L-shaped, and the second mounting plate 12 is provided with multiple support columns 13. The first mounting plate 14 is fixedly connected to the support columns 13 by bolts. The mounting bracket 7 is designed as a split structure, which can facilitate the installation of drive components and fixed shafts 10.

[0038] The fixing frame 7 is slidably set in the mounting cavity 6. The handle 3 is provided with a groove 11 for the fixed shaft 10 to slide. The handle 3 is provided with a base plate 9 for covering the mounting cavity 6. The lowest point of the measuring wheel 2 is lower than the extension line of the cutting position of the blade 1. During the operation, the measuring wheel 2 first comes into contact with the muscle tissue, which not only increases the friction between the two, allowing the measuring wheel 2 to rotate smoothly, but also facilitates the subsequent recording of the cutting length of the blade 1.

[0039] The ranging circuit 4 also includes a varistor 39 and a NOT gate logic circuit 38. The varistor 39 is mounted on the base plate 9 and coupled to the power module 17. The NOT gate logic circuit 38 is coupled to the varistor 39 and the data calculation module 37. A second spring 18 is provided in the mounting cavity 6 to keep the fixing frame 7 in contact with the varistor 39. A positioning post 19 is provided on the fixing frame 7 to position the second spring 18. The display 42 can display at least two sets of lengths A1 and A2. Length A1 is the distance cut by the first blade 1, and length A2 is the distance cut by the second blade 1. When the fixing frame 7 contacts the varistor 39, the output of the NOT gate logic circuit 38 outputs a low level to control the data calculation module 37 to clear length A1 to zero. When the fixing frame 7 is no longer in contact with the varistor 39, the NOT gate logic circuit 38 outputs a low level to control the data calculation module 37 to clear length A1 to zero. The output of the circuit 38 is high to control the data calculation module 37 to record the third cutting length A3. During the operation, the measuring wheel 2 is pressed on the muscle tissue. The reaction force exerted by the muscle tissue on the measuring wheel 2 can cause the measuring wheel 2 to drive the fixed shaft 10 and the fixed frame 7 to move upward, and make the fixed frame 7 disengage from the pressure-sensitive resistor 39. In this way, the first cutting length A1 and the second cutting length A2 of the blade 1 can be measured during the operation. After the second cutting is completed, the measuring wheel 2 disengages from the muscle tissue, and the fixed frame 7 is reset under the action of the second spring 18. The fixed frame 7 and the pressure-sensitive resistor 39 are in contact again, and the data calculation module 37 clears the data of the first cutting length A1 displayed on the display 42, and prepares to record the data of the third cutting length A3 of the blade 1.

[0040] The handle 3 is equipped with a control switch 5, which is coupled to the power module 17 and is used to control the power supply to the ranging circuit 4. When surgery is required, the control switch 5 is pressed so that the ranging circuit 4 can be powered normally by the power module 17. When the surgery is over, the control switch 5 can disconnect the power supply to the ranging circuit 4, thereby saving energy.

[0041] Working principle: During surgery, the doctor holds the scalpel handle 3 and presses the measuring wheel 2 against the muscle tissue. The measuring wheel 2 drives the fixed shaft 10 and the fixed frame 7 to slide upward. At this time, the measuring circuit 4 is ready to start measuring the cutting length of the blade 1. When the doctor moves the scalpel handle 3 to make the blade 1 cut the muscle tissue, the measuring wheel 2 starts to rotate, driving the fixed shaft 10 and the driving component to rotate synchronously. During the rotation of the driving component, the fixed conductive rod 43 contacts multiple movable conductive rods 27 in sequence. The on / off counter 41 records the number of times the fixed conductive rod 43 and the movable conductive rods 27 are energized. Then, the data calculation module 37 multiplies the number of energizations by the distance between two adjacent movable conductive rods 27 to calculate the cutting length of the blade 1. This cutting length can be transmitted to the display 42 through the transmission module 36 for display, so that the doctor can understand the cutting length of the blade 1 in real time during the operation, so as to effectively control the size of the surgical wound and reduce the patient's pain.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A surgical incision distance measuring device, characterized in that, include: The scalpel includes a blade (1) and a handle (3), the blade (1) being mounted on one end of the handle (3), and the handle (3) having a mounting cavity (6). The ranging element (8) is mounted on the tool holder (3), and the ranging element (8) includes a ranging wheel (2), a fixing frame (7) and a driving component. There are two ranging wheels (2) and they are located on both sides of the tool holder (3). The fixing frame (7), the driving component and the ranging circuit (4) are all located in the mounting cavity (6). A fixing shaft (10) for mounting the ranging wheel (2) is rotatably mounted on the fixing frame (7). The driving component is mounted on the fixing shaft (10) and rotates synchronously when the ranging wheel (2) rotates. The ranging circuit (4) includes a power module (17), a movable switch, an on / off counter (41), and a processor (40). The power module (17) is coupled to the on / off counter (41) and the processor and supplies power to both. The movable switch includes a fixed conductive rod (43) and a movable conductive rod (27). The fixed conductive rod (43) is mounted on a mounting bracket (7). Multiple movable conductive rods (27) are arranged in a circular array on the driving component. The movable conductive rods (27) and the fixed conductive rods (43) are coupled to the on / off counter (41) and the power module (17). During the rotation of the driving component... When the movable conductive rod (27) touches the fixed conductive rod (43), the on / off counter (41) is in the energized state and increments the number of energizations. When the fixed conductive rod (43) is located between two adjacent movable conductive rods (27), the on / off counter (41) is in the de-energized state. The processor (40) includes a transmission module (36) and a data calculation module (37). The data calculation module (37) is used to receive the number of energizations signal from the on / off counter (41) and multiply the signal by the distance between the two movable conductive rods (27) to obtain the length A of the rotation of the measuring wheel (2). The length A is the cutting length of the blade (1). The display (42) is coupled to the transmission module (36) and is used to display the length A.

2. The surgical incision distance measuring device according to claim 1, characterized in that, The driving component includes a first gear (15), a second gear (16), and a rotating shaft (20). The first gear (15) is mounted on a fixed shaft (10), and the rotating shaft (20) is rotatably mounted on a fixed frame (7). One end of the rotating shaft (20) has a first limiting part (29) that cooperates with the second gear (16). The movable conductive rod (27) is mounted on the second gear (16). The second gear (16) has fewer teeth than the first gear (15), and the two mesh and transmit power.

3. The surgical incision distance measuring device according to claim 2, characterized in that, The second gear (16) is provided with a groove (24), and a cover (22) for covering the groove (24) is provided on the side of the second gear (16). The cover (22) is provided with a protrusion (23) that is rotatably connected to the fixing frame (7), and the cover (22) is fixedly connected to the second gear (16) by bolts. The movable conductive rod (27) has a stepped shaft structure, with its larger diameter end embedded in the second gear (16) and its smaller diameter end penetrating through the cover (22). The inner side of the rotating shaft (20) is provided with a conductor (25). One end of the conductor (25) extends into the sink (24), and the other end passes through the rotating shaft (20) and extends to the outside of the fixed frame (7). A conductive connector (28) with an umbrella-shaped structure is provided between the conductor (25) and multiple movable conductive rods (27). The conductor (25) and the fixed conductive rod (43) are coupled to the on / off counter (41) and the power module (17) through wires.

4. The surgical incision distance measuring device according to claim 3, characterized in that, A one-way transmission component (21) is provided between the rotating shaft (20) and the fixed frame (7). The one-way transmission component (21) includes a rotating disk (26), a wedge block (35), a limiting bolt (34), and a first spring (33). The rotating disk (26) is fixed on the rotating shaft (20), and multiple slots (30) are arranged in an array on the rotating disk (26). The slots (30) have a guide slope (31) and a blocking surface (32). One end of the limiting bolt (34) passes through the fixed frame (7) and is fixedly connected to the wedge block (35). The first spring (33) is sleeved on the outside of the limiting bolt (34) and applies a force to the wedge block (35) to resist the slot (30).

5. The surgical incision distance measuring device according to claim 3, characterized in that, The fixing frame (7) includes a first mounting plate (14) and a second mounting plate (12). The first mounting plate (14) is L-shaped, and the second mounting plate (12) is provided with a plurality of support columns (13). The first mounting plate (14) is fixedly connected to the support columns (13) by bolts.

6. The surgical incision distance measuring device according to claim 3, characterized in that, The fixing frame (7) is slidably disposed in the mounting cavity (6). The tool handle (3) is provided with a sliding groove (11) for the fixed shaft (10) to slide. The tool handle (3) is provided with a base plate (9) for covering the mounting cavity (6). The lowest point of the measuring wheel (2) is lower than the extension line of the cutting position of the blade (1).

7. The surgical incision distance measuring device according to claim 6, characterized in that, The ranging circuit (4) further includes a varistor (39) and a NOT gate logic circuit (38). The varistor (39) is mounted on the base plate (9) and coupled to the power module (17). The NOT gate logic circuit (38) is coupled to the varistor (39) and the data calculation module (37). A second spring (18) is provided in the mounting cavity (6) to keep the fixing frame (7) in contact with the varistor (39). A positioning post (19) for positioning the second spring (18) is provided on the fixing frame (7). The display ( 42) At least two sets of lengths A1 and A2 can be displayed. Length A1 is the distance cut by the first blade (1), and length A2 is the distance cut by the second blade (1). When the fixing frame (7) touches the varistor (39), the output of the NOT gate logic circuit (38) outputs a low level to control the data calculation module (37) to clear the length A1 to zero. When the fixing frame (7) is no longer in contact with the varistor (39), the output of the NOT gate logic circuit (38) outputs a high level to control the data calculation module (37) to record the third cut length A3.

8. The surgical incision distance measuring device according to claim 6, characterized in that, The tool holder (3) is provided with a control switch (5), which is coupled to the power supply module (17) and is used to control the power supply to the ranging circuit (4).

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