Needle inserting depth control assembly of fire needle device

Abstract

The utility model belongs to the technical field of medical equipment, and particularly discloses a needle inserting depth control assembly of a fire needle device, which comprises a needle inserting driving unit, a depth limiting unit and a moving depth limiting unit, and the depth limiting unit comprises a first fixing seat, a maximum needle inserting depth limiting switch and a 0-position needle inserting depth limiting switch; the moving depth limiting unit comprises a driving structure, a controller, a second fixing seat, a moving depth limiting switch and a needle seat touch rod; and a fixed seat touch rod is arranged on the second fixed seat. When the fire needle device is started, the controller sends a reset instruction to the driving structure. By arranging the maximum needle inserting depth limiting switch and the 0-position needle inserting depth limiting switch, 0-position needle inserting depth resetting can be achieved during starting, and safety protection of the maximum needle inserting depth can be achieved when the positions of the limiting switches are adjusted.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a needle insertion depth control component for a fire needle device. Background Technology

[0002] Fire needling, also known as "burning needle," "hot needle," or "hot needle," is a type of acupuncture therapy where a red-hot needle is inserted into a specific part of the body or acupoint and quickly withdrawn to treat diseases. Fire needling therapy has a history of thousands of years in my country. Through clinical application and research by physicians throughout history, it has been continuously developed and perfected, becoming a unique medical system within acupuncture therapy. Fire needling has excellent efficacy in treating various cold-related conditions, pain syndromes, meridian disorders, skin diseases, and gynecological diseases. In clinical practice, fire needling emphasizes "redness, accuracy, and speed," requiring precise and rapid insertion and removal of the high-temperature fire needle into the acupoint. Furthermore, the ancient Chinese medical text *Zhenjiu Juying* states, "It is crucial to avoid inserting the needle too deeply, as this will damage the meridians; it is also crucial to avoid inserting it too shallowly, as this will be ineffective; the key is to find the middle ground," indicating that the depth of fire needling should not be too deep or too shallow, but rather aimed at reaching the affected area. Therefore, to achieve the best therapeutic effect, a high depth of needle insertion is essential.

[0003] Currently, clinical fire needling therapy commonly faces the following problems: the depth of needle insertion relies entirely on the individual clinical experience of the practitioner. Differences in experience and skill among practitioners can lead to variations in needle insertion depth. Even among the same practitioner, variations in individual physical conditions at different times can result in differences in needle insertion depth. These factors contribute to biased evaluations of the therapeutic effects of fire needling and may potentially lead to safety incidents. For novice practitioners just beginning to use fire needling, controlling and mastering the needle insertion depth is extremely difficult, requiring extensive practice and hindering its widespread application.

[0004] In response to this, the applicant proposed a solution for controlling the needle insertion depth in a previous patent application, application number 202011641141.3, entitled "A Gun-Type Electric Fire Needle," which includes a gun body and a power supply, drive unit, heating unit, and needle insertion unit disposed within the gun body. The gun body includes a hollow gun barrel and a grip rod; the needle insertion unit includes a fire needle, a needle shaft, and a needle cap assembly, with both ends of the needle shaft fixed to the fire needle and the needle cap assembly, respectively; the heating unit is used to heat the fire needle; the drive unit includes a first drive mechanism and a second drive mechanism; the first drive mechanism is used to open and close the heating unit; the second drive mechanism is used to drive the needle insertion unit; the needle cap assembly can be installed at the tail end of the gun barrel, and a connecting tube is fixed at the front end of the gun barrel, with the heating unit fixed inside the connecting tube; the fire needle can pass through the connecting tube or be located inside the connecting tube; the needle cap assembly includes a needle cap, a gun cover, and a connecting rod; the two ends of the connecting rod are... Do not connect to the needle cap and needle bar; the gun cover can be closed onto the tail of the gun bar; the gun cover has a through hole, and the connecting rod is slidably connected in the through hole; the drive unit also includes a fourth drive mechanism for controlling the needle insertion depth; the fourth drive mechanism includes a third controller, a limit switch seat, a limit switch, and a drive component fixed in the gun bar, the third controller being connected to the drive component; the limit switch is used to cut off the circuit between the electromagnet and the power supply; the limit switch seat has a slide groove, the limit switch is slidably connected in the slide groove, and the drive component is used to drive the limit switch to slide in the slide groove; the connecting rod has a limit block that can collide with the limit switch. The drive component moves the limit switch to the appropriate position, and when the limit block on the connecting rod collides with the limit switch, the limit switch disconnects the circuit between the electromagnet and the power supply; the connecting rod returns to its original position under the elastic force of the spring, causing the needle to retract into the connecting tube.

[0005] The above solution adjusts the needle insertion depth by adjusting the position of the limit switch. However, the solution does not set the limit position for the reciprocating movement of the limit switch, thus failing to achieve automatic reset of the limit switch and safety protection for the maximum needle insertion depth. Utility Model Content

[0006] The purpose of this utility model is to provide a needle insertion depth control component for a fire needle device. The limit switch can achieve a 0-position needle insertion depth reset when the device is turned on, and can achieve safety protection for the maximum needle insertion depth when the position of the limit switch is adjusted.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: a needle insertion depth control component for a fire needle device, comprising a needle insertion drive unit, a depth limiting unit, and a moving depth limiting unit located inside the fire needle housing and on one side of the fire needle assembly. The needle insertion drive unit is used to drive the fire needle assembly to insert the needle. The depth limiting unit includes a first fixed base, a maximum needle insertion depth limiting switch, and a 0-position needle insertion depth limiting switch. The first fixed base is fixed inside the fire needle housing. The maximum needle insertion depth limiting switch and the 0-position needle insertion depth limiting switch are mounted on the first fixed base, and the line connecting the maximum needle insertion depth limiting switch and the 0-position needle insertion depth limiting switch is parallel to the needle insertion direction of the fire needle assembly. The moving depth limiting unit includes a drive structure, a controller, a second fixed base, a moving depth limiting switch, and a needle holder contact rod. The controller is connected to the drive structure, the maximum needle insertion depth limiting switch, the 0-position needle insertion depth limiting switch, and the moving depth limiting switch. A fixed base contact rod is provided on the second fixed base. The drive structure... The device is used to drive the second fixed seat to reciprocate in a direction parallel to the needle insertion direction of the needle assembly, and the fixed seat contact rod is located between the maximum needle insertion depth limit switch and the 0-position needle insertion depth limit switch; when the fixed seat contact rod touches the maximum needle insertion depth limit switch and the 0-position needle insertion depth limit switch, the maximum needle insertion depth limit switch and the 0-position needle insertion depth limit switch will send a signal to the controller, and the controller will send a stop command to the drive structure; the moving depth limit switch is installed on the second fixed seat; the needle seat contact rod is fixed on the needle seat of the needle assembly, and the line connecting the needle seat contact rod and the moving depth limit switch is parallel to the needle insertion direction of the needle assembly; when the needle seat contact rod touches the moving depth limit switch, the moving depth limit switch sends a signal to the controller, the controller sends a power-off command to the needle insertion drive unit, and the needle assembly springs back to its original position under the action of the reset member; when the needle device is powered on, the controller sends a reset command to the drive structure.

[0008] Furthermore, the outer surface of the needle housing is provided with two depth adjustment buttons: a "+" button to increase the needle insertion depth and a "-" button to decrease the needle insertion depth. The two depth adjustment buttons are respectively connected to the controller. After pressing the depth adjustment button, the controller controls the drive structure to drive the second fixed seat to move back and forth. Each time the depth adjustment button is pressed, the drive structure drives the second fixed seat to move a first distance. Pressing and holding the depth adjustment button once drives the drive structure to move the second fixed seat a second distance.

[0009] Furthermore, the housing of the fire needle is provided with a sliding groove, the sliding direction of the sliding groove is parallel to the needle insertion direction of the fire needle assembly, and the needle seat is provided with a guide block, which is slidably connected in the sliding groove.

[0010] Furthermore, the driving structure includes a stepper motor, a driving chip, and a screw. The stepper motor is fixed inside the needle housing, and the output end of the stepper motor is used to drive the screw to rotate. The driving chip is located inside the stepper motor and is used to receive signals from the controller to perform forward and reverse rotation and determine the number of rotations. The second fixing seat is threadedly connected to the screw and slidably connected inside the needle housing. The length direction of the screw and the sliding direction of the second fixing seat are both parallel to the needle insertion direction of the needle assembly.

[0011] Furthermore, the needle insertion drive unit includes a trigger and an electromagnet, and the firing needle assembly includes a needle base, an iron core, and a firing needle section. The two sides of the iron core are respectively connected to the firing needle section and the needle base. The firing needle housing is provided with a through hole, and the trigger is slidably connected in the through hole. The trigger can automatically reset, and a conductive block is fixed on the trigger. The conductive block is used to connect the circuit of the electromagnet on the controller to the power supply. The iron core can move inside the electromagnet, and the iron core can generate a magnetic attraction force with the electromagnet.

[0012] Furthermore, a display screen is provided on the outside of the fire needle housing, and the display screen is connected to the controller. The display screen is used to display the moving distance of the second fixed base.

[0013] The working principle of this technical solution is as follows: After the fire needle device is turned on, the controller automatically sends a reset command to the stepper motor. The stepper motor rotates, driving the second fixed seat to move towards the 0-position needle depth limit switch until the fixed seat contact rod touches the 0-position needle depth limit switch. The 0-position needle depth limit switch sends a signal to the controller, and the controller sends a stop command to the stepper motor. Depending on the patient's actual situation, the "+" button is pressed the corresponding number of times. If more presses are needed or the needle depth needs adjustment, the "-" button is pressed. Each press of the "+" button controls the stepper motor to rotate a set number of revolutions, causing the second fixed seat to move a first distance towards the maximum needle depth limit switch. Each press of the "-" button controls the stepper motor to rotate a set number of revolutions in the opposite direction, causing the second fixed seat to move a first distance towards the 0-position needle depth limit switch. A long press of either the "+" or "-" button moves the second fixed seat a second distance. If the second fixed seat touches the maximum needle depth limit switch, the maximum needle depth limit switch sends a signal to the controller, and the controller sends a stop command to the stepper motor. The final distance the second mounting bracket moves will be displayed on the screen.

[0014] After setting the needle insertion depth parameters, the heating unit inside the fire needle housing is activated. The heating unit heats the fire needle. When the temperature reaches the set treatment temperature, the trigger is pressed. The conductive block connects the circuit, energizing the electromagnet. The iron core inside the electromagnet moves the fire needle assembly forward under the influence of the magnetic field, while the needle seat compression reset component is activated. When the needle seat contact rod triggers the movement depth limit switch on the second fixed seat, the movement depth limit switch sends a signal to the controller. The controller disconnects the circuit, the electromagnet is de-energized, the magnetic field disappears, and the force pushing the fire needle assembly forward disappears. At this point, the fire needle assembly resets under the rebound force of the reset component.

[0015] The beneficial effects of this technical solution are as follows:

[0016] ①This technical solution, by setting a maximum needle depth limit switch and a 0-position needle depth limit switch, can achieve 0-position needle depth reset when the machine is turned on, and can achieve safety protection of the maximum needle depth when adjusting the position of the limit switch.

[0017] ②This technical solution allows for gradual adjustment of the needle insertion depth by setting "+" and "-" buttons, ensuring the accuracy of the adjustment. This makes it easy for inexperienced new doctors to get started, facilitating its popularization and promotion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of the fire needle device;

[0019] Figure 2 for Figure 1 A schematic diagram of the center needle depth control component. Detailed Implementation

[0020] The following detailed description illustrates the specific implementation method:

[0021] The reference numerals in the accompanying drawings include: 1. Needle housing; 2. Needle holder; 3. Iron core; 4. Fixing rod; 5. Needle; 6. Display screen; 7. Heating button; 8. "+" button; 9. "-" button; 10. Stepper motor; 11. First fixing seat; 12. Second fixing seat; 13. Maximum needle depth limit switch; 14. 0-position needle depth limit switch; 15. Fixing seat contact rod; 16. Screw; 17. Movement depth limit switch; 18. Reset component; 19. Needle holder contact rod; 20. Guide block; 21. Trigger; 22. Controller; 23. Electromagnet; 24. Needle handle; 25. Connecting tube.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The basic implementation examples are as follows: Figure 1-2 The image shows a needle insertion depth control component for a fire needle device, comprising a needle insertion drive unit, a depth limiting unit, and a movement depth limiting unit located inside the fire needle housing 1 and on one side of the fire needle assembly. The fire needle housing 1 adopts a gun-type structure. The needle insertion drive unit drives the fire needle assembly to insert the needle. The needle insertion drive unit includes a trigger 21 and an electromagnet 23. The fire needle assembly includes a needle holder 2, an iron core 3, and a fire needle part. The two sides of the iron core 3 are respectively connected to the fire needle part and the needle holder 2. A through hole is provided on the gripping part of the fire needle housing 1, and the trigger 21 is slidably connected in the through hole. The trigger 21 can automatically reset (a spring can be provided between the trigger 21 and the fire needle housing 1). A conductive block is fixed on the trigger 21, which is used to connect the circuit of the electromagnet 23 on the controller 22 to the power supply. The iron core 3 can move inside the electromagnet 23, and the iron core 3 can generate a magnetic attraction force with the electromagnet 23. A slot is provided on one side of the fire needle housing 1 for the needle holder 2 to move. A reset element 18 (specifically a reset spring) is provided between the needle holder 2 and the electromagnet 23. One end of the reset element 18 contacts the cylindrical end face of the electromagnet 23, and the other end is stuck inside the needle holder 2. The reset element 18 is coaxial with the iron core 3, and its diameter is larger than the diameter of the iron core 3, and also slightly larger than the inner diameter of the electromagnet 23.

[0024] The fire needle part includes a fixing rod 4, a needle handle 24 and a needle 5. One end of the fixing rod 4 is coaxially fixed to the electromagnet 23, and the other end of the fixing rod 4 is threadedly connected to one end of the needle handle 24. The other end of the needle handle 24 is coaxially fixed to the needle 5.

[0025] The depth limiting unit includes a first fixed base 11, a maximum needle depth limiting switch 13, and a 0-position needle depth limiting switch 14. The first fixed base 11 is fixed inside the needle housing 1. The maximum needle depth limiting switch 13 and the 0-position needle depth limiting switch 14 are mounted on the first fixed base 11. The line connecting the maximum needle depth limiting switch 13 and the 0-position needle depth limiting switch 14 is parallel to the needle insertion direction of the needle assembly. The maximum needle depth limiting switch 13 is located on the side closer to the electromagnet 23. The moving depth limiting unit includes a drive structure, a controller 22, a second fixed base 12, a moving depth limiting switch 17, and a needle holder contact rod 19. The controller 22 is connected to the drive structure, the maximum needle depth limiting switch 13, the 0-position needle depth limiting switch 14, and the moving depth limiting switch 17. The second fixed base 12 is provided with a fixed base contact rod 15. The driving structure is used to drive the second fixed base 12 to reciprocate in a direction parallel to the needle insertion direction of the needle assembly. The fixed base contact rod 15 is located between the maximum needle insertion depth limit switch 13 and the 0-position needle insertion depth limit switch 14. When the fixed base contact rod 15 touches the maximum needle insertion depth limit switch 13 and the 0-position needle insertion depth limit switch 14, the maximum needle insertion depth limit switch 13 and the 0-position needle insertion depth limit switch 14 will send a signal to the controller 22, and the controller 22 will send a stop command to the driving structure.

[0026] The depth limit switch 17 is mounted on the second fixed base 12, and the needle holder contact rod 19 is fixed on the needle holder 2 of the needle assembly. The line connecting the needle holder contact rod 19 and the depth limit switch 17 is parallel to the needle insertion direction of the needle assembly. When the needle holder contact rod 19 touches the depth limit switch 17, the depth limit switch 17 sends a signal to the controller 22, and the controller 22 sends a power-off command to the needle insertion drive unit. The needle assembly springs back to its original position under the action of the reset member 18. When the needle device is turned on, the controller 22 sends a reset command to the drive structure.

[0027] The outer side of the needle housing 1 is equipped with two depth adjustment buttons: a "+" button 8 for increasing the needle insertion depth and a "-" button 9 for decreasing the needle insertion depth. The two depth adjustment buttons are respectively connected to the controller 22. After pressing the depth adjustment button, the controller 22 controls the drive structure to drive the second fixed seat 12 to move back and forth. Each time the depth adjustment button is pressed, the drive structure drives the second fixed seat 12 to move a first distance. Pressing and holding the depth adjustment button once drives the drive structure to move the second fixed seat 12 a second distance.

[0028] The fire needle housing 1 is provided with a sliding groove, the sliding direction of the sliding groove is parallel to the needle insertion direction of the fire needle assembly, and the needle seat 2 is provided with a guide block 20, which is slidably connected in the sliding groove.

[0029] The drive structure includes a stepper motor 10, a drive chip, and a screw 16. The stepper motor 10 is fixed inside the needle housing 1. The output of the stepper motor 10 is used to drive the screw 16 to rotate. The drive chip is located inside the stepper motor 10 and is used to receive signals from the controller 22 to reverse the direction of rotation and determine the number of rotations (it receives high and low level signals output by the controller 22, and the drive chip determines the forward and reverse direction of the stepper motor 10. At the same time, it receives pulse signals output by the controller 22. The number of pulses determines the number of rotations of the stepper motor 10. The number of rotations corresponds to the distance moved by the second fixed seat 12 and the movement depth limit switch 17). The second fixed seat 12 is threadedly connected to the screw 16 and slidably connected inside the needle housing 1. The length direction of the screw 16 and the sliding direction of the second fixed seat 12 are both parallel to the needle insertion direction of the needle assembly.

[0030] A connecting tube 25 is fixed to the front end of the gun barrel of the fire needle housing 1. A heating unit for heating the needle 5 is fixed inside the connecting tube 25. The heating unit includes a heating tube fixing component and a heating tube fixed to the heating tube fixing component (the specific structure can be found in the prior art section of the background section). A temperature sensor is fixed to the connecting tube 25. The heating tube fixing component is fixed inside the connecting tube 25. The needle 5 can reciprocate along its length inside the heating tube, and the needle 5 can pass through the connecting tube 25 or be completely inside the connecting tube 25. A heating circuit and a heat preservation circuit are connected to the controller 22. The temperature sensor is connected to the controller 22. The heating tube is connected to both the heating circuit and the heat preservation circuit. The heating circuit and the heat preservation circuit operate intermittently. The heating circuit and the heat preservation circuit are existing technologies, such as the heating and heat preservation functions of a water dispenser; therefore, their specific structures will not be described in detail in this technical solution. The temperature sensor is connected to the controller 22.

[0031] The outside of the fire needle housing 1 is also equipped with a power button and a heating button 7 that are connected to the controller 22.

[0032] The fire needle housing 1 is equipped with a display screen 6, which is connected to the controller 22. The display screen 6 is used to display the moving distance of the second fixed base 12, the temperature detected by the temperature sensor, and the alarm messages of the second fixed base 12 touching the maximum needle depth limit switch 13 and the 0-position needle depth limit switch 14.

[0033] The specific implementation process is as follows:

[0034] After the fire needle device is turned on, the controller 22 automatically sends a reset command to the stepper motor 10. The stepper motor 10 rotates, driving the second fixed seat 12 to move towards the 0-position needle depth limit switch 14 until the fixed seat contact rod 15 touches the 0-position needle depth limit switch 14. The 0-position needle depth limit switch 14 sends a signal to the controller 22, and the controller 22 sends a stop command to the stepper motor 10. According to the patient's actual situation, press the "+" button 8 a corresponding number of times. If you need to press it more or adjust the needle depth, press the "-" button 9. Each time the "+" button 8 is pressed, the controller 22 controls the stepper motor 10 to rotate a set number of revolutions, causing the second fixed seat 12 to move a first distance towards the maximum needle depth limit switch 13. Each time the "-" button 9 is pressed, the controller 22 controls the stepper motor 10 to rotate a set number of revolutions in the opposite direction, causing the second fixed seat 12 to move a first distance towards the 0-position needle depth limit switch 14. Press and hold the "+" button 8 or the "-" button 9 to move the second fixed base 12 a second distance. If the second fixed base 12 touches the maximum needle depth limit switch 13, the maximum needle depth limit switch 13 sends a signal to the controller 22, and the controller 22 sends a stop command to the stepper motor 10. The final distance moved by the second fixed base 12 will be displayed on the display screen 6.

[0035] After setting the needle insertion depth parameters, the heating unit inside the fire needle housing 1 is turned on. The heating unit heats the needle 5. When the temperature reaches the set treatment temperature, the trigger 21 is pressed, the conductive block connects the circuit, the electromagnet 23 is energized, and the iron core 3 located in the inner cavity of the electromagnet 23 drives the fire needle assembly forward under the action of the magnetic field. At the same time, the needle seat 2 compresses the reset piece 18. When the needle seat contact rod 19 triggers the movement depth limit switch 17 on the second fixed seat 12, the movement depth limit switch 17 sends a signal to the controller 22. The controller 22 disconnects the circuit, the electromagnet 23 is de-energized, the magnetic field disappears, and the force pushing the fire needle assembly forward disappears. At this time, under the action of the rebound force of the reset piece 18, the fire needle assembly resets.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A needle insertion depth control component for a fire needle device, characterized in that: The device includes an insertion drive unit, a depth limiting unit, and a moving depth limiting unit located inside the needle housing (1) and on one side of the needle assembly. The insertion drive unit drives the needle assembly to insert the needle. The depth limiting unit includes a first fixed base (11), a maximum insertion depth limiting switch (13), and a 0-position insertion depth limiting switch (14). The first fixed base (11) is fixed inside the needle housing (1). The maximum insertion depth limiting switch (13) and the 0-position insertion depth limiting switch (14) are mounted on the first fixed base (11). The line direction of the needle depth limit switch (14) is parallel to the needle insertion direction of the needle assembly; the moving depth limit unit includes a drive structure, a controller (22), a second fixed seat (12), a moving depth limit switch (17), and a needle holder contact rod (19); the controller (22) is connected to the drive structure, the maximum needle depth limit switch (13), the 0-position needle depth limit switch (14), and the moving depth limit switch (17); the second fixed seat (12) is provided with a fixed seat contact rod (15), and the drive structure is used to drive the second fixed seat (12) along the needle insertion direction of the needle assembly. The needle holder moves back and forth in a parallel direction, and the fixed seat contact rod (15) is located between the maximum needle depth limit switch (13) and the 0-position needle depth limit switch (14); when the fixed seat contact rod (15) touches the maximum needle depth limit switch (13) and the 0-position needle depth limit switch (14), the maximum needle depth limit switch (13) and the 0-position needle depth limit switch (14) will send a signal to the controller (22), and the controller (22) will send a stop command to the drive structure; the moving depth limit switch (17) is installed on the second fixed seat (12); the needle holder The contact rod (19) is fixed on the needle seat (2) of the needle assembly. The line connecting the needle seat contact rod (19) and the moving depth limit switch (17) is parallel to the needle insertion direction of the needle assembly. When the needle seat contact rod (19) touches the moving depth limit switch (17), the moving depth limit switch (17) sends a signal to the controller (22). The controller (22) sends a power-off command to the needle insertion drive unit. The needle assembly rebounds and resets under the action of the reset member (18). When the needle device is turned on, the controller (22) sends a reset command to the drive structure.

2. The needle insertion depth control component of the fire needle device according to claim 1, characterized in that: The outer side of the fire needle housing (1) is provided with two depth adjustment buttons, one is a "+" button (8) to increase the needle insertion depth, and the other is a "-" button (9) to decrease the needle insertion depth. The two depth adjustment buttons are respectively connected to the controller (22). After pressing the depth adjustment button, the controller (22) controls the drive structure to drive the second fixed seat (12) to move back and forth. Each time the depth adjustment button is pressed, the drive structure drives the second fixed seat (12) to move a first distance. Pressing and holding the depth adjustment button once drives the drive structure to move the second fixed seat (12) a second distance.

3. The needle insertion depth control component of the fire needle device according to claim 1, characterized in that: The fire needle housing (1) is provided with a sliding groove, the sliding direction of the sliding groove is parallel to the needle insertion direction of the fire needle assembly, and the needle seat (2) is provided with a guide block (20), the guide block (20) is slidably connected in the sliding groove.

4. The needle insertion depth control component of the fire needle device according to claim 1, characterized in that: The driving structure includes a stepper motor (10), a driving chip, and a screw (16). The stepper motor (10) is fixed inside the needle housing (1). The output end of the stepper motor (10) is used to drive the screw (16) to rotate. The driving chip is located inside the stepper motor (10) and is used to receive signals from the controller (22) to perform forward and reverse rotation and determine the number of rotations. The second fixing seat (12) is threaded onto the screw (16) and slidably connected inside the needle housing (1). The length direction of the screw (16) and the sliding direction of the second fixing seat (12) are both parallel to the needle insertion direction of the needle assembly.

5. The needle insertion depth control component of the fire needle device according to claim 1, characterized in that: The needle drive unit includes a trigger (21) and an electromagnet (23). The fire needle assembly includes a needle holder (2), an iron core (3), and a fire needle part. The two sides of the iron core (3) are respectively connected to the fire needle part and the needle holder (2). The fire needle housing (1) is provided with a through hole. The trigger (21) is slidably connected in the through hole. The trigger (21) can automatically reset. A conductive block is fixed on the trigger (21). The conductive block is used to connect the circuit of the electromagnet (23) on the controller (22) to the power supply. The iron core (3) can move inside the electromagnet (23). The iron core (3) can generate a magnetic attraction force with the electromagnet (23).

6. The needle insertion depth control component of the fire needle device according to claim 1, characterized in that: The fire needle housing (1) is provided with a display screen (6) on the outside. The display screen (6) is connected to the controller (22). The display screen (6) is used to display the moving distance of the second fixed base (12).

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