Cerebrospinal fluid drainage flow rate control device and method

Abstract

The invention discloses a cerebrospinal fluid drainage flow velocity control device and method.The device comprises a base and a mounting plate, the mounting plate is provided with a lifting plate in sliding connection, the lifting plate is connected with a lifting driving mechanism, the lifting plate is provided with a metering cylinder, a liquid outlet in the bottom of the metering cylinder is connected with a liquid storage bottle through a hose, and the liquid storage bottle is arranged on the mounting plate; a liquid inlet in the top of the metering cylinder is connected with a Murphy dropper, the Murphy dropper is connected with a drainage tube, a stop valve is installed on the drainage tube and connected with a stop valve switching mechanism, and a valve element is arranged at the bottom of the inner side of the metering cylinder and connected with a valve element switching mechanism; and an air exhaust opening of the air exhaust assembly is connected with an air exhaust connector on the liquid storage bottle through a hose. The device is provided with the dripping speed monitoring unit, and the height of the drainage tube is automatically adjusted by comparing the current drainage speed with the set drainage speed, so that the drainage speed is changed, and the requirements of a patient for the drainage amount and the drainage speed in different stages are met.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary devices, and particularly relates to a cerebrospinal fluid drainage flow rate control device and method. Background Art

[0002] Most neurosurgical patients are critically ill and need to indwell various drainage tubes after surgery. Improper tube care can lead to conditions such as bleeding, infection, and exacerbation of the condition, even endangering life. Safe and effective drainage after surgery is the key and guarantee for the success of the surgery.

[0003] Important drainage tubes after neurosurgery include ventricular drainage tubes and lumbar cistern drainage tubes.

[0004] The purposes of ventricular drainage include: (1) rescuing the critical state of intracranial hypertension caused by blocked cerebrospinal fluid circulation, such as cerebral hemorrhage and acute obstructive hydrocephalus; (2) intracranial pressure monitoring in the cerebral ventricle and therapeutic cerebrospinal fluid external drainage after ventricle surgery; (3) intracranial tumors combined with intracranial hypertension, and ventricular drainage is performed before surgery to prevent sudden drop in intracranial pressure during surgery from causing brain hernia; (4) intracranial infections that require intraventricular drug injection and irrigation. The following points need to be noted during ventricular drainage: (1) The height of the drainage tube: When lying flat, the opening of the drainage tube needs to be 10-15 cm higher than the lateral ventricle (i.e., the level of the external auditory canal). When lying on the side, based on the median sagittal plane as the baseline, it is 15-18 cm higher; (2) Keep the drainage unobstructed. The liquid in the tube fluctuating up and down with the patient's breathing, pulse, etc. indicates unobstructed. The drainage tube should not be compressed, twisted, or folded, and avoid pulling.

[0005] The purposes of lumbar cistern drainage include: (1) draining the hemorrhage and bloody cerebrospinal fluid in the subarachnoid space, such as after aneurysm embolization; (2) treating various cerebrospinal fluid leaks and incision leaks; (3) for intracranial infections, it can continuously drain the infected cerebrospinal fluid and perform intrathecal injection of antibacterial drugs for treatment. The following points need to be noted during lumbar cistern drainage: (1) The patient's body position and the height of the drainage tube: The drainage tube is generally 10-15 cm higher than the external auditory canal plane, and the height can be adjusted by the doctor according to the patient's intracranial pressure during lumbar puncture or according to the daily drainage volume. Note that during continuous lumbar cistern drainage, the patient needs to stay in bed absolutely. If the height of the patient's head changes, the drainage height needs to be readjusted to maintain the intracranial pressure at a normal level. (2) Keep the drainage unobstructed: Fix it properly to prevent folding and twisting. The diameter of the lumbar cistern drainage tube is 1 mm, and the lumen is relatively thin and easy to block. When the drainage is not smooth, the drainage height can be reduced. When it is suspected that the blood clot is blocked, the drainage tube can be squeezed or flushed. It is forbidden to squeeze the drainage tube inward to prevent retrograde infection. (3) Drainage speed and drainage volume: Generally, it is appropriate to be 10-15 mL / h, and the daily drainage volume is 200-300 mL. Too fast or excessive drainage speed is likely to cause low-pressure headache and pneumocephalus (same as the ventricular drainage tube).

[0006] There are many difficulties in clinical work. First: the fixation of the drainage tube. The traditional method is to directly place it on the bed or fix it to the head of the bed with adhesive tape or a tie, which is inconvenient for observation. It is easy to pull the drainage tube due to the gravity of the drainage bag or cause unplanned extubation. Second: the height of the drainage tube. Clinically, the height of the drainage bottle is mostly determined by visual inspection or empirically according to the amount of drainage, lacking objective and accurate evaluation. There are also various drainage tube hooks on the market. Although these hooks have height scales, they require manual operation. Repeatedly adjusting the height of the drainage tube increases the nursing workload. Since medical staff cannot always monitor at the bedside and family members do not have relevant knowledge, when the patient's condition changes, serious consequences are likely to occur due to untimely adjustment of the drainage tube height, threatening the patient's safety. Third: the drainage speed. Different cerebrospinal fluid drainage speeds have a significant impact on the body. Excessive and too-fast drainage will cause serious consequences such as subarachnoid cavity collapse and brain hernia. While too-slow drainage speed can delay the extubation time, increase the risk of intracranial infection, and increase the treatment cost. Multiple studies have shown that a drainage speed of 10 ml / h can obtain the best drainage effect. However, due to the above objective reasons, the actual drainage speed is difficult to control. Therefore, ensuring a drainage speed of 10 ml / h is not only a difficulty in nursing work but also a key point in ensuring the treatment effect. Summary of the Invention

[0007] 1. Technical problems to be solved: the fixation of the drainage tube during cerebrospinal fluid drainage and how to control the height to control the drainage speed.

[0008] In view of the above technical problems, the present invention provides a cerebrospinal fluid drainage flow rate control device and method.

[0009] 2. Technical solutions: A cerebrospinal fluid drainage flow rate control device includes a base and a mounting plate. The mounting plate is provided with a lifting plate connected in a sliding manner. The lifting plate is connected to a lifting drive mechanism. A measuring cylinder is provided on the lifting plate. The bottom liquid outlet of the measuring cylinder is connected to a storage bottle through a hose. The storage bottle is arranged on the mounting plate. The top liquid inlet of the measuring cylinder is connected to a Murphy drip chamber. The Murphy drip chamber is connected to a drainage tube. A stop valve is installed on the drainage tube. The stop valve is connected to a stop valve switch mechanism. A valve core is provided at the inner bottom of the measuring cylinder. The valve core is connected to a valve core switch mechanism. The mounting plate is also provided with an air extraction assembly. The air extraction port of the air extraction assembly is connected to an air extraction joint on the storage bottle through a hose. A liquid level gauge is provided on the measuring cylinder. A drip speed monitoring unit is provided on one side of the Murphy drip chamber. The mounting plate is also provided with a laser locator. The laser locator is horizontally rotatably connected to a lifting seat. The lifting seat is connected to a lifting assembly. A scale is provided on the lifting seat. A displacement sensor is also provided on the lifting seat. The displacement sensor, the liquid level gauge, the drip speed monitoring unit, and the lifting drive mechanism are all electrically connected to a display controller.

[0010] Further, the lifting drive mechanism includes a lifting motor. The movable end of the lifting motor is fixedly connected to a screw rod. The screw rod is threadedly connected to a lifting nut. The lifting nut is fixedly connected to a first slider. The first slider is slidably connected to a slide rail. The first slider is fixedly connected to a lifting seat.

[0011] Further, the stop valve switching mechanism includes a cylinder. The movable end of the cylinder is fixedly connected to a rack. The rack meshes with a spur gear. The spur gear meshes with a sector gear plate. The gear plate is fixedly connected to the drive shaft of the stop valve.

[0012] Further, the valve core switching mechanism includes a first connecting plate hinged to the movable end of the cylinder. The first connecting plate is hinged to a second connecting plate. The middle position of the second connecting plate is hinged to a first fixing seat. The first fixing seat is arranged on the lifting plate or the side wall of the metering cylinder. The second connecting plate is hinged to a third connecting plate. The third connecting plate is hinged to a pull rod. The pull rod is slidably connected to a positioning sleeve. The bottom of the pull rod is fixedly connected to the valve core.

[0013] Preferably, an annular retaining piece is arranged on the pull rod. A spring is sleeved on the outer side of the pull rod between the annular retaining piece and the positioning sleeve.

[0014] Further, the air extraction assembly includes an air extraction airbag. An air extraction port and an air outlet are arranged on the airbag. One-way valves are arranged on both the air extraction port and the air outlet. The bottom of the airbag is fixed on a fixing plate. A guide post is arranged on the fixing plate. A sliding plate is slidably connected to the guide post. The sliding plate is fixed on the top of the airbag. The top of the sliding plate is hinged to a fourth connecting plate. The fourth connecting plate is hinged to a fifth connecting plate. The fifth connecting plate is hinged to a sixth connecting plate. The sixth connecting plate is hinged to the movable end of the cylinder. The middle position of the fifth connecting plate is hinged to a second fixing seat. The second fixing seat is fixed on the mounting plate.

[0015] Preferably, the hinge shaft at the middle position of the fifth connecting plate is close to the sixth connecting plate.

[0016] Further, the lifting assembly includes a second slider fixedly connected to the lifting seat. The second slider is slidably connected to a chute on the mounting plate. A through screw hole is arranged at the top of the second slider. A locking bolt is threadedly connected in the screw hole.

[0017] Further, a buzzer alarm is arranged in the display controller.

[0018] A method for controlling the flow rate of cerebrospinal fluid drainage includes the following steps: S1: Adjust the height and horizontal orientation of the laser locator so that the laser irradiation line of the laser locator is flush with the plane of the patient's external auditory canal. The displacement sensor monitors the displacement value. The display controller determines the initial height of the laser locator according to the displacement value. This height serves as the reference height for adjusting the height of the drainage tube. S2: Adjust the height of the lifting plate through the lifting drive mechanism. At this time, the height of the end of the drainage tube (the end connected to the Murphy's dropper) changes, and the drainage speed changes with this height. The drip speed monitoring unit monitors the drip speed during drainage in real time and further converts it into the drainage speed. If it does not meet the set value, the height of the end of the drainage tube is adjusted in real-time gradient until it meets the set value, thereby maintaining the dynamic balance of the drainage speed; if the set value still cannot be reached after adjustment, the buzzer alarm is activated for alarm; S3: When the liquid level gauge monitors that the volume of cerebrospinal fluid drained reaches the set value, the cylinder drives to close the stop valve, and at the same time opens the valve core of the measuring cylinder and evacuates the liquid storage bottle to form a negative pressure, quickly sucking the cerebrospinal fluid collected in the measuring cylinder into the liquid storage bottle under negative pressure. When resetting, the next collection is automatically carried out. The amount of cerebrospinal fluid collected in the next collection and the drainage speed are set by the display controller, and the dynamic balance of the drainage speed is maintained in the same way as in S2.

[0019] 3. Beneficial effects: The present invention provides a device and method for controlling the flow rate of cerebrospinal fluid drainage. The device is provided with a drip speed monitoring unit, which measures the current drainage speed by monitoring the drip speed of cerebrospinal fluid droplets, and autonomously adjusts the height of the drainage tube according to the comparison between the current drainage speed and the set drainage speed, thereby changing the drainage speed to meet the needs of patients for the drainage volume and drainage speed at different stages. The whole process maintains dynamic monitoring and correction to ensure the stable operation of the device. In addition, after a stage of drainage task, the stop valve on the drainage tube can be closed at the same time, the valve core of the measuring cylinder is opened, and the liquid storage bottle is evacuated to generate a negative pressure, quickly emptying the cerebrospinal fluid collected in the measuring cylinder, avoiding blockage, and quickly switching to the next stage of collection task, shortening the interval time between two collection tasks. Brief description of the drawings

[0020] Figure 1 is the overall structural schematic diagram of the device for controlling the flow rate of cerebrospinal fluid drainage of the present invention; Figure 2 is the partial structural schematic diagram of the device for controlling the flow rate of cerebrospinal fluid drainage of the present invention; Figure 3 is for the present invention Figure 2 enlarged view of part A; Figure 4 is the installation structural schematic diagram of the laser locator of the present invention. Detailed implementation manners

[0021] The present invention will be specifically described below with reference to the drawings.

[0022] As shown in the attached Figure 1 to the attached Figure 4 , Example 1: A cerebrospinal fluid drainage flow rate control device comprises a base 1 and a mounting plate 2, a lifting plate 3 with a sliding connection is provided on the mounting plate 2, the lifting plate 3 is connected to a lifting drive mechanism 4, a metering cylinder 5 is provided on the lifting plate 3, a bottom liquid outlet of the metering cylinder 5 is connected to a liquid storage bottle 6 through a hose, the liquid storage bottle 6 is arranged on the mounting plate 2, a top liquid inlet of the metering cylinder 5 is connected to a Murphy-type dropper 7, the Murphy-type dropper 7 is connected to a drainage tube 8, a stop valve 9 is installed on the drainage tube 8, the stop valve 9 is connected to a stop valve switch mechanism 10, a valve core 11 is provided at the inner bottom of the metering cylinder 5, the valve core 11 is connected to a valve core switch mechanism 12, an exhaust component 13 is also provided on the mounting plate 2, and an exhaust port of the exhaust component 13 is connected to a stop valve switch mechanism 12 through a hose. An exhaust joint is provided on the liquid storage bottle 6, a liquid level meter 14 is provided on the metering cylinder 5, a drip rate monitoring unit 15 is provided on one side of the Murphy-type dropper 7, and the unit is a prior art. The number of droplets dripping within a certain period of time is collected by image acquisition technology, so as to further calculate the drainage volume. A laser locator 16 is also provided on the mounting plate 2, and the laser locator 16 is horizontally rotated and connected to a lifting seat 17, and the lifting seat 17 is connected to a lifting component 18. A scale 19 is provided on the lifting seat 17, and a displacement sensor 20 is also provided on the lifting seat 17. The displacement sensor 20, the liquid level meter 14, the drip rate monitoring unit 15 and the lifting drive mechanism 4 are all electrically connected to a display controller 21, and a buzzer alarm is provided in the display controller 21.

[0023] When using the cerebrospinal fluid drainage flow rate control device of this embodiment, first rotate the laser locator 16 horizontally toward the patient's head, and then adjust the height of the lifting seat 17 so that the laser irradiation line of the laser locator 16 is flush with the patient's external auditory canal plane. At this time, the displacement sensor 20 is displaced, and the display controller 21 determines the initial height of the laser locator 16 according to the displacement value, and this height is used as the reference height for adjusting the height of the drainage tube 8; adjust the height of the lifting plate 3, and the position of the terminal tube opening of the drainage tube 8 changes synchronously with the height of the lifting plate 3. When the height of the drainage tube 8 changes relative to the reference height, the drainage speed will change. The height of the drainage tube 8 is dynamically adjusted according to the current drainage speed monitored by the drip rate monitoring unit 15 to make it consistent with the set drainage speed.

[0024] Embodiment 2: The lifting drive mechanism 4 includes a lifting motor 41, the movable end of the lifting motor 41 is fixedly connected to a screw rod 42, the screw rod 42 is threadedly connected to a lifting nut 43, the lifting nut 43 is fixedly connected to a first slider 44, the first slider 44 is slidably connected to a slide rail 45, and the first slider 44 is fixedly connected to the lifting seat 3. The lifting motor 41 drives the screw rod 42 to rotate, and the screw 42 drives the lifting nut 43 to move up and down, thereby driving the lifting plate 3 connected to the first slider 44 to slide up and down, and the height of the drainage tube 8 changes synchronously with the height change of the lifting plate 3.

[0025] Embodiment 3: The stop valve switching mechanism 10 includes a cylinder 101. The movable end of the cylinder 101 is fixedly connected to a rack 102. The rack 102 meshes with a spur gear 103, and the spur gear 103 meshes with a sector gear plate 104. The gear plate 104 is fixedly connected to the drive shaft of the stop valve 9. The cylinder drives the rack 102 to move. The rack 102 drives the spur gear 103 to rotate, and the spur gear 103 drives the gear plate 104 to rotate, thereby rotating the drive shaft of the stop valve 9.

[0026] Embodiment 4: The valve core switching mechanism 12 includes a first connecting plate 121 hinged to the movable end of the cylinder 101. The first connecting plate 121 is hinged to a second connecting plate 122. The middle position of the second connecting plate 122 is hinged to a first fixing seat 123. The first fixing seat 123 is arranged on the lifting plate 3 or the side wall of the metering cylinder 5. The second connecting plate 122 is hinged to a third connecting plate 124. The third connecting plate 124 is hinged to a pull rod 125. The pull rod 125 is slidably connected to a positioning sleeve 126. The bottom of the pull rod 125 is fixedly connected to the valve core 11.

[0027] The cylinder 101 pushes the first connecting plate 121 downward. The first connecting plate 121 pushes the second connecting plate 122 to rotate. The second connecting plate 122 drives the third connecting plate 124 to pull the pull rod 125 upward, thereby lifting the valve core 11 upward to open the liquid outlet below the metering cylinder 5.

[0028] Preferably, an annular retaining plate 127 is provided on the pull rod 125. A spring 128 is sleeved on the outer side of the pull rod 125 between the annular retaining plate 127 and the positioning sleeve 126. After the valve core switching mechanism 12 fails, the spring 128 will drive the annular retaining plate 127 to move downward, thereby pressing the valve core 11 tightly to avoid liquid leakage, thus avoiding measurement errors in the drainage volume.

[0029] Embodiment 5: The air extraction assembly 13 includes an air extraction airbag 131. The airbag 131 is provided with an air extraction port and an air outlet. Check valves are provided on both the air extraction port and the air outlet. The bottom of the airbag 131 is fixed to a fixing plate 132. A guide post 133 is provided on the fixing plate 132. A sliding plate 134 is slidably connected to the guide post 133. The sliding plate 134 is fixed to the top of the airbag 131. The top of the sliding plate 134 is hinged to a fourth connecting plate 135. The fourth connecting plate 135 is hinged to a fifth connecting plate 136. The fifth connecting plate 136 is hinged to a sixth connecting plate 137. The sixth connecting plate 137 is hinged to the movable end of the cylinder 101. The middle position of the fifth connecting plate 136 is hinged to a second fixing seat 138. The second fixing seat 138 is fixed to the mounting plate 2.

[0030] Preferably, the hinge shaft at the middle position of the fifth connecting plate 136 is close to the sixth connecting plate 137.

[0031] In this embodiment, the cylinder 101 drives the sixth connecting plate 137 to move downward. The sixth connecting plate 137 pushes the fifth connecting plate 136 to rotate. The fifth connecting plate 136 lifts the sliding plate 134 through the fourth connecting plate 135, thereby pulling the airbag 131 to inhale, generating negative pressure in the liquid storage bottle 6, facilitating the rapid inhalation of the cerebrospinal fluid collected in the measuring cylinder 5, avoiding blockage, reducing the interval time between two drainages, and thus reducing the impact on the patient caused by interrupted drainage.

[0032] Embodiment 6: The lifting assembly 18 includes a second slider 181 fixedly connected to the lifting seat 17. The second slider 181 is slidably connected to the chute 182 on the mounting plate 2. A through screw hole is provided at the top of the second slider 181, and a locking bolt 183 is threadedly connected in the screw hole. The second slider 181 is locked by the locking bolt 183 and fixed at a set height.

[0033] Embodiment 7: The following provides a method for controlling the flow rate of cerebrospinal fluid drainage, including the following steps: S1: Adjust the height and horizontal orientation of the laser locator 16 so that the laser irradiation line of the laser locator 16 is flush with the plane of the patient's external auditory canal. The displacement sensor 20 monitors the displacement value, and the display controller 21 determines the initial height of the laser locator 16 according to the displacement value, and this height serves as the reference height for adjusting the height of the drainage tube 8. S2: Adjust the height of the lifting plate 3 through the lifting drive mechanism 4. At this time, the height of the end of the drainage tube 8 (the end connected to the Murphy's dropper 7) changes, and the drainage speed changes with this height. The drip speed monitoring unit 15 monitors the drip speed during drainage in real time and further converts it into the drainage speed. If it does not meet the set value, the height of the end of the drainage tube 8 is adjusted in real-time gradient until it meets the set value, thereby maintaining the dynamic balance of the drainage speed; if the set value still cannot be achieved after adjustment, the buzzer alarm is activated for alarm. S3: When the liquid level gauge 14 monitors that the volume of the drained cerebrospinal fluid reaches the set value, the cylinder 101 drives to close the stop valve 9, and at the same time opens the valve core 11 of the measuring cylinder 5 and evacuates the liquid storage bottle 6 to form negative pressure, quickly sucking the cerebrospinal fluid collected in the measuring cylinder 5 into the liquid storage bottle 6 under negative pressure. When resetting, the next collection is automatically performed. The amount of cerebrospinal fluid collected next time and the drainage speed are set by the display controller 21, and the dynamic balance of the drainage speed is maintained in the same manner as in S2.

[0034] Although the present invention has been disclosed above with preferred embodiments, they are not used to limit the present invention. Any person skilled in this art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the protection scope of the claims of this application.

Claims

1. A cerebrospinal fluid drainage flow rate control device, characterized in that: The utility model comprises a base and a mounting plate, wherein a lifting plate with a sliding connection is provided on the mounting plate, the lifting plate is connected to a lifting drive mechanism, a metering cylinder is provided on the lifting plate, a liquid outlet at the bottom of the metering cylinder is connected to a liquid storage bottle through a hose, the liquid storage bottle is arranged on the mounting plate, a liquid inlet at the top of the metering cylinder is connected to a Murphy-type dropper, the Murphy-type dropper is connected to a drainage tube, a stop valve is installed on the drainage tube, the stop valve is connected to a stop valve switching mechanism, a valve core is provided at the inner bottom of the metering cylinder, the valve core is connected to the valve core switching mechanism, a vacuum assembly is also provided on the mounting plate, a vacuum port of the vacuum assembly is connected to a vacuum joint on the liquid storage bottle through a hose, a liquid level meter is provided on the metering cylinder, a dripping rate monitoring unit is provided on one side of the Murphy-type dropper, a laser locator is also provided on the mounting plate, the laser locator is horizontally rotated and connected to a lifting seat, the lifting seat is connected to the lifting assembly, a scale is provided on the lifting seat, a displacement sensor is also provided on the lifting seat, and the displacement sensor, the liquid level meter, the dripping rate monitoring unit and the lifting drive mechanism are all electrically connected to a display controller.

2. A cerebrospinal fluid drainage flow rate control device according to claim 1, characterized in that: The lifting drive mechanism comprises a lifting motor, a movable end of the lifting motor is fixedly connected to a screw rod, the screw rod is threadedly connected to a lifting nut, the lifting nut is fixedly connected to a first slider, the first slider is slidably connected to a slide rail, and the first slider is fixedly connected to a lifting seat.

3. A cerebrospinal fluid drainage flow rate control device according to claim 1 or 2, characterized in that: The stop valve switch mechanism comprises a cylinder, a movable end of the cylinder is fixedly connected to a rack, the rack meshes with a spur gear, the spur gear meshes with a sector-shaped toothed plate, and the toothed plate is fixedly connected to a driving shaft of the stop valve.

4. A cerebrospinal fluid drainage flow rate control device according to claim 3, characterized in that: The valve core switch mechanism includes a first connecting plate hinged to the movable end of the cylinder, the first connecting plate is hinged to the second connecting plate, the middle position of the second connecting plate is hinged to the first fixed seat, the first fixed seat is arranged on the lifting plate or on the side wall of the metering cylinder, the second connecting plate is hinged to the third connecting plate, the third connecting plate is hinged to the pull rod, the pull rod is slidably connected to the positioning sleeve, and the bottom of the pull rod is fixedly connected to the valve core.

5. A cerebrospinal fluid drainage flow rate control device according to claim 4, characterized in that: The pull rod is provided with an annular baffle, and an outer sleeve of the pull rod between the annular baffle and the positioning sleeve is provided with a spring.

6. A cerebrospinal fluid drainage flow rate control device according to claim 5, characterized in that: The vacuum assembly includes a vacuum airbag, which is provided with a vacuum port and an air outlet, and both the vacuum port and the air outlet are provided with a one-way valve. The bottom of the airbag is fixed on a fixed plate, and a guide column is provided on the fixed plate. A sliding plate is slidably connected to the guide column, and the sliding plate is fixed to the top of the airbag. The top of the sliding plate is hinged to the fourth connecting plate, the fourth connecting plate is hinged to the fifth connecting plate, the fifth connecting plate is hinged to the sixth connecting plate, the sixth connecting plate is hinged to the movable end of the cylinder, and the middle position of the fifth connecting plate is hinged to the second fixed seat, and the second fixed seat is fixed to the mounting plate.

7. The cerebrospinal fluid drainage flow rate control device according to claim 6, characterized in that: The hinge axis at the middle position of the fifth connecting plate is close to the sixth connecting plate.

8. A cerebrospinal fluid drainage flow rate control device according to claim 1 or 7, characterized in that: The lifting assembly comprises a second sliding block fixedly connected to the lifting seat, the second sliding block is slidably connected to a sliding groove on the mounting plate, a screw hole is provided on the top of the second sliding block, and a locking bolt is threadedly connected to the inner thread of the screw hole.

9. The cerebrospinal fluid drainage flow rate control device according to claim 8, characterized in that: A buzzer alarm is arranged inside the display controller.

10. A cerebrospinal fluid drainage flow rate control method as claimed in claim 9, characterized in that: The following steps are involved: S1: Adjust the height and horizontal direction of the laser locator so that the laser irradiation line of the laser locator is flush with the plane of the patient's external auditory canal. The displacement sensor monitors the displacement value, and the display controller determines the initial height of the laser locator according to the displacement value. This height is used as the reference height for adjusting the height of the drainage tube. S2: The height of the lifting plate is adjusted by the lifting drive mechanism. At this time, the height of the end of the drainage tube (the end connected to the Murphy-type dropper) changes, and the drainage speed changes with the height. The dripping speed during drainage is monitored in real time by the dripping speed monitoring unit, and further converted into the drainage speed. If it does not meet the set value, the height of the end of the drainage tube is adjusted in real time until it meets the set value, thereby maintaining the dynamic balance of the drainage speed; if it still cannot reach the set value after adjustment, the buzzer alarm is activated to alarm; S3: When the volume of cerebrospinal fluid drained by the level meter reaches the set value, the cylinder drives the shut-off valve to close, and at the same time opens the valve core of the measuring cylinder and evacuates the liquid storage bottle to form a negative pressure, quickly pumping the cerebrospinal fluid collected in the measuring cylinder into the liquid storage bottle under negative pressure. When reset, the next collection is automatically carried out. The next amount of cerebrospinal fluid collected and the drainage speed are set by the display controller, and the dynamic balance of the drainage speed is maintained in the same way as S2.

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