Medical negative pressure suction device and adjustment method thereof

Abstract

The present invention relates to a medical negative pressure suction device. The present invention solves the problem in the prior art that negative pressure regulation is difficult, regulation needs to be controlled by a negative pressure center, and there is a certain delay. The key points of the technical solution are as follows: it includes a two-level regulator arranged on the wall at the use site, each of the two-level regulators is provided with a first negative pressure connecting pipe and a second negative pressure connecting pipe connected to the negative pressure center, the first negative pressure connecting pipe and the second negative pressure connecting pipe are each provided with an independent solenoid valve, the two-level regulator is also provided with a controller for controlling the solenoid valve, the solenoid valves are electrically connected to the controller through a corresponding drive circuit, the controller is also electrically connected to two regulating circuits, each regulating circuit corresponds to a solenoid valve, the first negative pressure connecting pipe and the second negative pressure connecting pipe are connected in parallel and extend to form a negative pressure hose, and a negative pressure suction port is provided at the ends of the first negative pressure connecting pipe and the second negative pressure connecting pipe.

Description

Technical Field

[0001] The invention belongs to a negative pressure suction device, and relates to a medical negative pressure suction device and a regulating method thereof. Background Art

[0002] The negative pressure suction device is a tool that creates a negative pressure state in its suction head by a certain method, and the material outside the suction head is squeezed toward the suction head, thereby achieving the "suction" effect. In the medical process, it mainly plays the role of absorbing tissue fluid and providing auxiliary functions for surgery. At present, the negative pressure suction device is operated in a centralized manner with a negative pressure center, and the adjustment during surgery is relatively cumbersome.

[0003] Chinese patent CN208598872U disclosed a portable negative pressure suction device in 2017, and its structure includes a negative pressure suction device body, a negative pressure suction bottle, a sealed vacuum bottle, a fixing frame, a supporting leg, a negative pressure suction device, a barometer and a universal wheel. A negative pressure suction bottle is provided on the left side of the top of the negative pressure suction device body, and a barometer is connected to the top of the negative pressure suction bottle through a pipeline. A pressure regulating valve is provided on the right side of the barometer, and a first connecting pipe is connected to the left side of the top of the negative pressure suction bottle through a pipeline, and a negative pressure suction device is provided at the bottom of the first connecting pipe. A second connecting pipe is provided on the right side of the top of the negative pressure suction bottle, and a sealed vacuum bottle is provided at the bottom of the second connecting pipe. A fixing seat is provided at the bottom of the negative pressure suction bottle and the sealed vacuum bottle, and fixing frames are welded on both sides of the top of the negative pressure suction device body. Although this technical content can be sucked by on-site adjustment, due to the limitation of the structure of the negative pressure suction bottle itself adopted by the negative pressure suction device, the negative pressure provision range is limited, and the adjustable range is subject to certain restrictions, and there is a large room for improvement. Summary of the invention

[0004] The present invention solves the problem in the prior art that negative pressure regulation is difficult, regulation needs to be controlled by a negative pressure center, and there is a certain delay, and provides a medical negative pressure suction device and a regulation method thereof.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a medical negative pressure suction device, which is connected to a negative pressure center through a connecting tube, and the negative pressure center provides negative pressure and performs primary regulation, including a secondary regulator arranged on the wall of the use site, each of which is equipped with a first negative pressure connecting tube and a second negative pressure connecting tube connected to the negative pressure center, and an independent solenoid valve is arranged on the first negative pressure connecting tube and the second negative pressure connecting tube, and a controller for controlling the solenoid valve is also arranged in the secondary regulator, and the solenoid valve is electrically connected to the controller through a corresponding driving circuit, and the controller is also electrically connected to two regulating circuits, each regulating circuit corresponds to a solenoid valve, the first negative pressure connecting tube and the second negative pressure connecting tube are connected in parallel and extend to form a negative pressure hose, and a negative pressure suction port is arranged at the ends of the first negative pressure connecting tube and the second negative pressure connecting tube, and a mechanical interlocking button is arranged near the end of the negative pressure hose, and the regulating slider of the regulating circuit is installed on the negative pressure hose near the interlocking button. The present invention solves the problem of the prior art by adopting a two-level regulation method. The negative pressure regulation provided by the negative pressure center is the first-level regulation, and a second-level regulator is added thereafter. The actual negative pressure is controlled by controlling the opening of the solenoid valves independently configured on the first negative pressure connecting pipe and the second negative pressure connecting pipe. In the present invention, a first negative pressure connecting pipe and a second negative pressure connecting pipe are configured, and mainly automatic and manual negative pressure suction methods are adopted. During automatic suction, the manual suction method can be locked by a mechanical interlocking button. Of course, the controller itself also has an interlocking of the two working modes. Furthermore, through this design method, two different negative pressures can be designed for suction. The manual method can be operated in a manner similar to clicking to suck a small amount of tissue fluid, while the automatic method can be used to suck more tissue fluid.

[0006] Preferably, the mechanical interlocking button includes a button body, a rectangular frame, a normally open extension block, a normally closed extension block and a normally open convex ball and a normally closed convex ball, the button body includes a button top, a button neck and a button column, the rectangular frame is sleeved on the first negative pressure connecting tube and the second negative pressure connecting tube, the button body is inserted into the rectangular frame, the button top is fixedly connected to the upper end of the button column through the button neck, the outer side of the button neck is sleeved with an upper spring, the upper end of the upper spring abuts against the lower end surface of the button top, the lower end of the upper spring abuts against the upper surface of the rectangular frame, and the button column is located at the first negative pressure connecting tube. Between the first negative pressure connecting tube and the second negative pressure connecting tube, the height of the button column is less than the height of the rectangular frame, the lower end of the button column extends horizontally to form a normally closed extension block, the normally closed extension block protrudes upward and is provided with a normally closed convex ball, the lower part of the normally closed extension block is an active cavity, the upper end of the button column extends horizontally to form a normally open extension block, the normally open extension block abuts against the inner surface of the rectangular frame, the normally open extension block protrudes downward and is provided with a normally open convex ball, the first negative pressure connecting tube is placed between the normally closed convex ball and the inner surface of the rectangular frame, and the second negative pressure connecting tube is placed between the normally open convex ball and the inner surface of the rectangular frame. In the present invention, in order to reduce the possibility of sudden changes in negative pressure, it is necessary to add a mechanical method for interlocking to improve safety. In the present technical solution, a mechanical method is used to interlock the first negative pressure connecting tube and the second negative pressure connecting tube, thereby improving safety and making the present invention have only a single operating mode.

[0007] Preferably, a spring slot is provided at the lower end of the button column, a lower spring is arranged in the spring slot, and the lower end surface of the lower spring abuts against the inner surface of the rectangular frame. The design of the upper and lower springs ensures the rebound force of the present invention, and will not cause the rebound to fail to reach the position due to spring problems.

[0008] Preferably, the controller is also electrically connected to a switching switch K1 for switching between manual and automatic, the input end of the switching switch K1 is connected to the power supply through the voltage stabilizing chip U1, the automatic adjustment output end of the switching switch K1 is grounded through the diode D3, the resistor R4 and the adjustment resistor RT1 in sequence, the input end of the adjustment resistor RT1 is electrically connected to the controller, the manual adjustment output end of the switching switch K1 is grounded through the diode D4, the resistor R5 and the adjustment resistor RT2 in sequence, the input end of the adjustment resistor RT2 is electrically connected to the controller, and the adjustment ends of the adjustment resistors RT1 and RT2 are installed on the negative pressure hose near the interlocking button as adjustment sliders.

[0009] Preferably, the drive circuit structures corresponding to the solenoid valves are all the same.

[0010] Preferably, a driving circuit electrically connected to the controller includes a diode D1, an inductor L1, a field effect transistor Q1, a transistor Q2, a resistor R1 and a resistor R2, wherein the anode of the diode D1 is connected to the power supply, the cathode of the diode D1 is connected to the input end of the solenoid valve M1 through the inductor L1, the output end of the solenoid valve M1 is connected to the drain of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded through the resistor R1, the source of the field effect transistor Q1 is also connected to the base of the transistor Q2, the gate of the field effect transistor Q1 is connected to the first end of the resistor R3, the second end of the resistor R3 is electrically connected to the controller, the collector of the transistor Q2 is connected to the first end of the resistor R3, and the first end of the resistor R3 is grounded through the resistor R2.

[0011] Preferably, the controller is also electrically connected to an indicator, which is an LED indicator, and the controller is also connected to a segment code display screen for displaying the current negative pressure value, and the segment code display screen and the LED indicator are both installed on the surface of the secondary regulator. The segment code display screen is used to display the data of the current negative pressure value, and the LED indicator indicates the current manual operation mode.

[0012] A method for adjusting a medical negative pressure suction device, applicable to the medical negative pressure suction device as described above, comprises the following steps:

[0013] Step 1: The controller determines the current working mode of the medical negative pressure suction device according to the switching value of the current switching switch K1. If it is in manual mode, the manual step 1 is executed; if it is in automatic mode, the automatic step 1 is executed; if it is in closed mode, all solenoid valves are closed;

[0014] Automatic step 1: the controller controls the opening of the solenoid valve on the second negative pressure connecting pipe according to the resistance value of the adjusting resistor RT2, the controller sets the solenoid valve on the first negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the first negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT1;

[0015] Automatic step 2, adjusting the opening of the solenoid valve on the second negative pressure connecting pipe in real time according to the resistance value of the adjusting resistor RT2, the medical negative pressure suction device continuously provides negative pressure, if the switching value of the switching switch K1 needs to be switched to the manual step, then execute the manual step 1, otherwise continue to execute the automatic step 2;

[0016] Manual step 1: the controller controls the opening of the solenoid valve on the first negative pressure connecting pipe according to the resistance value of the adjusting resistor RT1, the controller sets the solenoid valve on the second negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the second negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT2;

[0017] Manual step two, adjust the opening of the solenoid valve on the first negative pressure connecting tube in real time according to the resistance value of the adjusting resistor RT1, and the medical negative pressure suction device provides negative pressure according to the action of the interlocking button. If it is necessary to switch to the automatic step according to the switching value of the switching switch K1, execute automatic step one, otherwise continue to execute manual step two.

[0018] The present invention can perform two-level adjustment on site, and can also perform manual and automatic suction according to usage requirements, thereby achieving better usage effects.

[0019] Preferably, when the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve is greater than a threshold and the working mode is switched, the preset adjustment sub-step is started:

[0020] Preset adjustment sub-step 1, calculating the delay time corresponding to the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve;

[0021] The preset adjustment sub-step 2 is to determine the number of consecutive instantaneous opening values ​​when the solenoid valve is opened according to the length of the delay time, and to set a number of instantaneous opening values ​​in an evenly divided manner according to the number of instantaneous opening values;

[0022] In the preset adjustment sub-step three, the solenoid valve works in a manner of changing the instantaneous opening value for several consecutive times until the delay ends, and the opening value of the solenoid valve is equal to the instantaneous opening value when the solenoid valve is initially preset to be opened, and the preset adjustment sub-step ends. The present invention makes a clear distinction between the negative pressures between manual and automatic through reasonable adjustment, but does not make the difference between the negative pressures too large. Through reasonable control, when the manual mode is required, the interlock button can be operated in a manner similar to clicking, and a small amount of tissue fluid can be absorbed by the instantaneous negative pressure, while the automatic mode can continuously absorb more tissue fluid. In the process of switching between manual and automatic, the preset delay time can be used to prevent the occurrence of problems such as backflow and organ damage caused by sudden changes in negative pressure, which is a reliable safety measure.

[0023] The substantial effect of the present invention is as follows: the present invention solves the prior art by adopting a two-level regulation method. The negative pressure regulation provided by the negative pressure center is the first-level regulation, after which a second-level regulator is added. The actual negative pressure is controlled by controlling the opening of the solenoid valves independently configured on the first negative pressure connecting pipe and the second negative pressure connecting pipe. In the present invention, a first negative pressure connecting pipe and a second negative pressure connecting pipe are configured, and mainly automatic and manual negative pressure suction methods are adopted. During automatic suction, the manual suction method can be locked by a mechanical interlocking button. Of course, the controller itself also has an interlocking of the two working modes. Furthermore, through this design method, two different negative pressures can be designed for suction. The manual method can be operated in a manner similar to clicking to suck a small amount of tissue fluid, while the automatic method can be used to suck more tissue fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall schematic diagram of the present invention;

[0025] Figure 2 A circuit diagram of the control circuit in the present invention;

[0026] Figure 3 A schematic diagram of the structure of the interlocking button in the present invention;

[0027] Figure 4 A schematic diagram of a secondary controller in the present invention;

[0028] In the figure: 1. first negative pressure connecting pipe, 2. second negative pressure connecting pipe, 3. secondary regulator, 4. adjusting slider, 5. interlocking button, 6. negative pressure suction port, 7. segment code display screen, 8. LED indicator, a1. button top, a2. upper spring, a3. lower spring, a4. button column, a5. rectangular frame, a6. normally closed convex ball, a7. normally open convex ball, a8. movable cavity, a9. first through-tube cavity, a10. second through-tube cavity. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below through specific embodiments.

[0030] Embodiment 1:

[0031] A medical negative pressure suction device (see attached Figure 1 To Attachment Figure 4), which is connected to the negative pressure center through a connecting pipe, and the negative pressure center provides negative pressure and performs primary regulation, including a secondary regulator 3 arranged on the wall at the use site, each of which is equipped with a first negative pressure connecting pipe 1 and a second negative pressure connecting pipe 2 connected to the negative pressure center, and an independent solenoid valve is arranged on the first negative pressure connecting pipe and the second negative pressure connecting pipe, and a controller for controlling the solenoid valve is also arranged in the secondary regulator, and the solenoid valve is electrically connected to the controller through a corresponding driving circuit, and the controller is also electrically connected to two regulating circuits, each regulating circuit corresponds to a solenoid valve, the first negative pressure connecting pipe and the second negative pressure connecting pipe are connected in parallel and extend to form a negative pressure hose, and a negative pressure suction port 6 is arranged at the ends of the first negative pressure connecting pipe and the second negative pressure connecting pipe, and a mechanical interlocking button 5 is arranged near the end of the negative pressure hose, and an adjusting slider 4 of the regulating circuit is installed on the negative pressure hose near the interlocking button. The mechanical interlocking button includes a button body, a rectangular frame a5, a normally open extension block, a normally closed extension block and a normally open convex ball a7, a normally closed convex ball a6, the button body includes a button top a1, a button neck and a button column a4, the rectangular frame is sleeved on the first negative pressure connecting tube and the second negative pressure connecting tube, the button body is inserted into the rectangular frame, the button top is fixedly connected to the upper end of the button column through the button neck, the outer side of the button neck is sleeved with an upper spring a2, the upper end of the upper spring abuts against the lower end surface of the button top, the lower end of the upper spring abuts against the upper surface of the rectangular frame, the button column is located at the first negative pressure connecting tube and Between the second negative pressure connecting tube, the height of the button column is less than the height of the rectangular frame, the lower end of the button column extends horizontally to form a normally closed extension block, the normally closed extension block protrudes upward and is provided with a normally closed convex ball, and the lower part of the normally closed extension block is an active cavity a8, the upper end of the button column extends horizontally to form a normally open extension block, the normally open extension block abuts against the inner surface of the rectangular frame, the normally open extension block protrudes downward and is provided with a normally open convex ball, the first negative pressure connecting tube is placed between the normally closed convex ball and the inner surface of the rectangular frame, which is the first tube cavity a9; the second negative pressure connecting tube is placed between the normally open convex ball and the inner surface of the rectangular frame, which is the second tube cavity a10. The lower end of the button column is provided with a spring groove, and a lower spring a3 is arranged in the spring groove, and the lower end surface of the lower spring abuts against the inner surface of the rectangular frame.The controller is also electrically connected to a switch K1 for switching between manual and automatic operation. The input end of the switch K1 is connected to the power supply through the voltage stabilizing chip U1. The automatic adjustment output end of the switch K1 is grounded through the diode D3, the resistor R4 and the adjustment resistor RT1 in sequence. The input end of the adjustment resistor RT1 is electrically connected to the controller. The manual adjustment output end of the switch K1 is grounded through the diode D4, the resistor R5 and the adjustment resistor RT2 in sequence. The input end of the adjustment resistor RT2 is electrically connected to the controller. The adjustment ends of the adjustment resistors RT1 and RT2 are installed on the negative pressure hose near the interlocking button as adjustment sliders. The drive circuit structures corresponding to the solenoid valves are the same. A driving circuit electrically connected to the controller includes a diode D1, an inductor L1, a field effect transistor Q1, a transistor Q2, a resistor R1 and a resistor R2, wherein the anode of the diode D1 is connected to a power supply, the cathode of the diode D1 is connected to the input end of the electromagnetic valve M1 through the inductor L1, the output end of the electromagnetic valve M1 is connected to the drain of the field effect transistor Q1, the source of the field effect transistor Q1 is connected to the ground through the resistor R1, the source of the field effect transistor Q1 is also connected to the base of the transistor Q2, the gate of the field effect transistor Q1 is connected to the first end of the resistor R3, the second end of the resistor R3 is electrically connected to the controller, the collector of the transistor Q2 is connected to the first end of the resistor R3, and the first end of the resistor R3 is grounded through the resistor R2. The controller is also electrically connected to an indicator, which is an LED indicator 8, and the controller is also connected to a segment code display screen 7 for displaying the current negative pressure value, and the segment code display screen and the LED indicator are both installed on the surface of the secondary regulator.

[0032] The present embodiment solves the existing technology by adopting a two-level regulation method. The negative pressure regulation provided by the negative pressure center is a first-level regulation. After that, a second-level regulator is added. The regulation is carried out on site. The actual negative pressure is controlled by controlling the opening of the electromagnetic valve independently configured on the first negative pressure connecting pipe and the second negative pressure connecting pipe. In the present invention, the first negative pressure connecting pipe and the second negative pressure connecting pipe are configured. The automatic and manual negative pressure suction methods are mainly adopted. When the suction is automatic, the manual suction method can be locked by a mechanical interlocking button. Of course, the controller itself also has an interlocking of the two working modes. Further, through this design method, two different negative pressures can be designed for suction. The manual method can be operated in a similar way to click to suck a small amount of tissue fluid, while the automatic method can be used to suck more tissue fluid. The design of the upper and lower springs ensures the rebound strength of the present invention, and will not cause the rebound to be in place due to spring problems. In the embodiment, in order to reduce the possibility of sudden changes in negative pressure, it is necessary to add a mechanical interlocking method to improve safety. In the present technical solution, a mechanical method is used to interlock the first negative pressure connecting pipe and the second negative pressure connecting pipe, thereby improving safety and making the present invention have only a single operating mode.

[0033] A method for adjusting a medical negative pressure suction device, applicable to the medical negative pressure suction device as described above, comprises the following steps:

[0034] Step 1: The controller determines the current working mode of the medical negative pressure suction device according to the switching value of the current switching switch K1. If it is in manual mode, the manual step 1 is executed; if it is in automatic mode, the automatic step 1 is executed; if it is in closed mode, all solenoid valves are closed;

[0035] Automatic step 1: the controller controls the opening of the solenoid valve on the second negative pressure connecting pipe according to the resistance value of the adjusting resistor RT2, the controller sets the solenoid valve on the first negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the first negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT1;

[0036] Automatic step 2, adjusting the opening of the solenoid valve on the second negative pressure connecting pipe in real time according to the resistance value of the adjusting resistor RT2, the medical negative pressure suction device continuously provides negative pressure, if the switching value of the switching switch K1 needs to be switched to the manual step, then execute the manual step 1, otherwise continue to execute the automatic step 2;

[0037] Manual step 1: the controller controls the opening of the solenoid valve on the first negative pressure connecting pipe according to the resistance value of the adjusting resistor RT1, the controller sets the solenoid valve on the second negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the second negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT2;

[0038] Manual step two, adjust the opening of the solenoid valve on the first negative pressure connecting tube in real time according to the resistance value of the adjusting resistor RT1, and the medical negative pressure suction device provides negative pressure according to the action of the interlocking button. If it is necessary to switch to the automatic step according to the switching value of the switching switch K1, execute automatic step one, otherwise continue to execute manual step two.

[0039] Preferably, when the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve is greater than a threshold and the working mode is switched, the preset adjustment sub-step is started:

[0040] Preset adjustment sub-step 1, calculating the delay time corresponding to the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve;

[0041] The preset adjustment sub-step 2 is to determine the number of consecutive instantaneous opening values ​​when the solenoid valve is opened according to the length of the delay time, and to set a number of instantaneous opening values ​​in an evenly divided manner according to the number of instantaneous opening values; the specific examples here are as follows:

[0042] When the difference between the instantaneous opening value of the set solenoid valve when it is opened and the current opening value of another solenoid valve is in the range of T1 to T2, a delay of 1 second is set and an instantaneous opening value is set. This instantaneous opening value is the average of the instantaneous opening value of the set solenoid valve when it is opened and the current opening value of another solenoid valve.

[0043] When the difference between the instantaneous opening value when the solenoid valve is set to open and the current opening value of another solenoid valve is in the range of T2 to T3, a delay of 1.5 seconds is set, and 2 instantaneous opening values ​​are set, and the 2 instantaneous opening values ​​are evenly divided according to the predetermined difference.

[0044] When the difference between the instantaneous opening value when the solenoid valve is set to open and the current opening value of another solenoid valve is in the range of T3 to T4, a delay of 2 seconds is set and 3 instantaneous opening values ​​are set, that is, the 3 instantaneous opening values ​​are evenly divided according to the predetermined difference.

[0045] In the preset adjustment sub-step three, the solenoid valve operates in a manner of changing a number of consecutive instantaneous opening values ​​until the delay ends, and the opening value of the solenoid valve is equal to the instantaneous opening value when the solenoid valve is initially preset to be opened, and the preset adjustment sub-step ends.

[0046] This embodiment makes the negative pressure difference between manual and automatic obvious through reasonable adjustment, but does not make the difference between the negative pressures too large. Through reasonable control, when the manual mode is needed, the interlock button can be operated in a similar way to clicking, and a small amount of tissue fluid can be sucked by instantaneous negative pressure, while the automatic mode can continuously suck more tissue fluid. In the process of switching between manual and automatic, the preset delay time can be used to prevent the occurrence of problems such as reflux and organ damage caused by sudden changes in negative pressure, which is a reliable safety measure.

[0047] In summary, this embodiment can perform two-level adjustment on site, and can also perform manual and automatic suction according to usage requirements, thereby achieving better usage results.

[0048] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A method for adjusting a medical negative pressure suction device, characterized in that: The following steps are involved: Step 1: The controller determines the current working mode of the medical negative pressure suction device according to the switching value of the current switching switch K1. If it is in manual mode, the manual step 1 is executed; if it is in automatic mode, the automatic step 1 is executed; if it is in closed mode, all solenoid valves are closed; Automatic step 1: the controller controls the opening of the solenoid valve on the second negative pressure connecting pipe according to the resistance value of the adjusting resistor RT2, the controller sets the solenoid valve on the first negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the first negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT1; Automatic step 2, adjusting the opening of the solenoid valve on the second negative pressure connecting pipe in real time according to the resistance value of the adjusting resistor RT2, the medical negative pressure suction device continuously provides negative pressure, if the switching value of the switching switch K1 needs to be switched to the manual step, then execute the manual step 1, otherwise continue to execute the automatic step 2; Manual step 1: the controller controls the opening of the solenoid valve on the first negative pressure connecting pipe according to the resistance value of the adjusting resistor RT1, the controller sets the solenoid valve on the second negative pressure connecting pipe to be closed, and presets the instantaneous opening value of the solenoid valve on the second negative pressure connecting pipe when it is opened according to the resistance value of the adjusting resistor RT2; Manual step 2, adjusting the opening of the solenoid valve on the first negative pressure connecting pipe in real time according to the resistance value of the adjusting resistor RT1, the medical negative pressure suction device provides negative pressure according to the action of the interlocking button, if the automatic step needs to be switched according to the switching amount of the switching switch K1, the automatic step 1 is executed, otherwise the manual step 2 is continued; The medical negative pressure suction device is connected to the negative pressure center through a connecting tube, and the negative pressure center provides negative pressure and performs primary regulation, including: a secondary regulator arranged on the wall of the use site, each of which is equipped with a first negative pressure connecting tube and a second negative pressure connecting tube connected to the negative pressure center, and an independent solenoid valve is arranged on the first negative pressure connecting tube and the second negative pressure connecting tube, and a controller for controlling the solenoid valve is also arranged in the secondary regulator, and the solenoid valve is electrically connected to the controller through a corresponding driving circuit, and the controller is also electrically connected to two regulating circuits, each regulating circuit corresponds to a solenoid valve, the first negative pressure connecting tube and the second negative pressure connecting tube are connected and extended in parallel to form a negative pressure hose, and a negative pressure suction port is arranged at the ends of the first negative pressure connecting tube and the second negative pressure connecting tube, and a mechanical interlocking button is arranged near the end of the negative pressure hose, and the regulating slider of the regulating circuit is installed on the negative pressure hose near the interlocking button; The mechanical interlocking button comprises a button body, a rectangular frame, a normally open extension block, a normally closed extension block, a normally open convex ball, and a normally closed convex ball. The button body comprises a button top, a button neck, and a button column. The rectangular frame is sleeved on the first negative pressure connecting tube and the second negative pressure connecting tube. The button body is inserted into the rectangular frame. The button top is fixedly connected to the upper end of the button column through the button neck. An upper spring is sleeved on the outer side of the button neck. The upper end of the upper spring abuts against the lower end surface of the button top, and the lower end of the upper spring abuts against the upper surface of the rectangular frame. The button column is located at the first negative pressure connecting tube. Between the connecting pipe and the second negative pressure connecting pipe, the height of the button column is less than the height of the rectangular frame, the lower end of the button column extends horizontally to form a normally closed extension block, the normally closed extension block protrudes upward and is provided with a normally closed convex ball, the lower part of the normally closed extension block is an active cavity, the upper end of the button column extends horizontally to form a normally open extension block, the normally open extension block abuts against the inner surface of the rectangular frame, the normally open extension block protrudes downward and is provided with a normally open convex ball, the first negative pressure connecting pipe is placed between the normally closed convex ball and the inner surface of the rectangular frame, and the second negative pressure connecting pipe is placed between the normally open convex ball and the inner surface of the rectangular frame; A spring groove is provided at the lower end of the button column, a lower spring is arranged in the spring groove, and the lower end surface of the lower spring abuts against the inner surface of the rectangular frame; The controller is also electrically connected to a switch K1 for switching between manual and automatic operation. The input end of the switch K1 is connected to the power supply through the voltage stabilizing chip U1. The automatic adjustment output end of the switch K1 is grounded through the diode D3, the resistor R4 and the adjustment resistor RT1 in sequence. The input end of the adjustment resistor RT1 is electrically connected to the controller. The manual adjustment output end of the switch K1 is grounded through the diode D4, the resistor R5 and the adjustment resistor RT2 in sequence. The input end of the adjustment resistor RT2 is electrically connected to the controller. The adjustment ends of the adjustment resistors RT1 and RT2 are installed on the negative pressure hose near the interlocking button as adjustment sliders. The drive circuit structures corresponding to the solenoid valves are all the same; A driving circuit electrically connected to the controller includes a diode D1, an inductor L1, a field effect transistor Q1, a transistor Q2, a resistor R1 and a resistor R2, wherein the anode of the diode D1 is connected to the power supply, the cathode of the diode D1 is connected to the input end of the electromagnetic valve M1 through the inductor L1, the output end of the electromagnetic valve M1 is connected to the drain of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded through the resistor R1, the source of the field effect transistor Q1 is also connected to the base of the transistor Q2, the gate of the field effect transistor Q1 is connected to the first end of the resistor R3, the second end of the resistor R3 is electrically connected to the controller, the collector of the transistor Q2 is connected to the first end of the resistor R3, and the first end of the resistor R3 is grounded through the resistor R2; The controller is also electrically connected to an indicator, which is an LED indicator. The controller is also connected to a segment code display screen for displaying the current negative pressure value. The segment code display screen and the LED indicator are both installed on the surface of the secondary regulator.

2. The method for adjusting the medical negative pressure suction device according to claim 1, characterized in that: When the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve is greater than the threshold and the working mode is switched, the preset adjustment sub-step is started: Preset adjustment sub-step 1, calculating the delay time corresponding to the difference between the instantaneous opening value of the preset solenoid valve when it is opened and the current opening value of another solenoid valve; The preset adjustment sub-step 2 is to determine the number of consecutive instantaneous opening values ​​when the solenoid valve is opened according to the length of the delay time, and to set a number of instantaneous opening values ​​in an evenly divided manner according to the number of instantaneous opening values; In the preset adjustment sub-step three, the solenoid valve operates in a manner of changing a number of consecutive instantaneous opening values ​​until the delay ends, and the opening value of the solenoid valve is equal to the instantaneous opening value when the solenoid valve is initially preset to be opened, and the preset adjustment sub-step ends.

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