Negative pressure aspirator for aspirating pleural effusion

Abstract

The utility model belongs to the technical field of negative pressure aspirators, and particularly relates to a pleural effusion suction negative pressure aspirator which comprises a liquid storage bottle, a first connector and a second connector are arranged on the liquid storage bottle, the first connector is connected with a puncture needle assembly through a drainage tube, and the second connector is connected with a negative pressure assembly through a connecting tube. The puncture needle assembly comprises a needle seat connected with the drainage tube and a puncture needle connected with the needle seat, the negative pressure assembly comprises a vacuum pump connected with the connecting tube, a controller electrically connected with the vacuum pump and a piezoresistive sensor arranged in the needle seat, and the piezoresistive sensor is electrically connected with the controller. The controller controls the power of the vacuum pump according to the negative pressure information of the piezoresistive sensor, the negative pressure is detected through the piezoresistive sensor, and the detected pressure information is transmitted to the controller. When the controller detects that the negative pressure is abnormal, the power of the vacuum pump can be automatically adjusted, and then the negative pressure is automatically adjusted, so that the flow velocity stability is controlled.

Description

TECHNICAL FIELD

[0001] The utility model belongs to negative pressure aspirator technical field especially relates to a chest fluid suction negative pressure aspirator. BACKGROUND

[0002] In current clinical practice, the suction of pleural effusion mainly relies on the use of large aperture puncture needle (such as 16G thick needle) and manual injector (usually 100ml empty needle) for multiple suction. However, this technique has several problems:

[0003] 1. Suction speed is difficult to control: in the process of manual suction, the operator must constantly push and pull the piston of the injector, and the speed often depends on the personal experience of the operator. If the operation is too fast, it may cause the pressure in the pleural cavity to drop sharply, thereby inducing pleural reaction (such as cough, chest pain and even shock);

[0004] 2. Negative pressure is difficult to balance: manual operation is difficult to accurately control the negative pressure, if the strength is too large, it is easy to cause mechanical damage (such as bleeding or pneumothorax) of the pleura, if the strength is too small, it is difficult to effectively suck out the viscous pleural effusion. SUMMARY

[0005] The utility model discloses a chest fluid suction negative pressure aspirator mainly solves the current chest fluid suction uses large aperture puncture needle and manual injector for multiple suction, and the problem that speed and negative pressure are not easy to control.

[0006] In order to achieve the purpose, the utility model provides a chest fluid suction negative pressure aspirator, including liquid storage bottle, be provided with first interface and second interface on the liquid storage bottle, the first interface is connected with puncture needle assembly through drainage tube, the second interface is connected with negative pressure component through connecting pipe, the puncture needle assembly includes the needle holder connected with drainage tube, the puncture needle connected with needle holder, the negative pressure component includes vacuum pump connected with connecting pipe, the controller electric connection with vacuum pump, the piezoresistive sensor arranged in needle holder, the piezoresistive sensor is electrically connected with controller, the power of vacuum pump is controlled according to the negative pressure information of piezoresistive sensor of controller, the liquid storage bottle bottom still is provided with drainage device.

[0007] Preferably, the drainage device includes a rotary seat rotatably disposed at the bottom of the liquid storage bottle, a mounting hole disposed on the rotary seat, and a top rod movably mounted in the mounting hole. The bottom of the liquid storage bottle is provided with a drainage hole in communication with the top rod. A flow channel is provided in the top rod, and the flow channel is connected between the top rod and the drainage hole.

[0008] Preferably, the drainage hole is provided with a silica gel valve.

[0009] Preferably, the rotating seat bottom is provided with a groove communicated with the mounting hole, the ejector rod bottom is located in the groove, the ejector rod is connected with an operating rod, one end of the operating rod is connected with the ejector rod, and the other end extends out of the rotating seat.

[0010] Preferably, the drainage tube and the connecting tube are both provided with a one-way valve electrically connected with the controller.

[0011] Preferably, the liquid storage bottle is further provided with a one-way air inlet valve electrically connected with the controller.

[0012] Preferably, the liquid storage bottle is a transparent liquid storage bottle with scales.

[0013] Preferably, the controller is an STM32 microcontroller.

[0014] The technical scheme provided by the utility model has at least the following technical effects:

[0015] 1. The pleural effusion negative pressure aspirator discloses a piezoresistor sensor for detecting negative pressure and transmitting the detected pressure information to the controller.

[0016] 2. In the case of excessive liquid accumulation in the liquid storage bottle or temporary extraction of liquid for detection, the liquid discharge device at the bottom of the liquid storage bottle can be used for liquid discharge, thereby realizing more convenient operation.

[0017] 3. The pleural effusion suction negative pressure aspirator can perform one-time continuous suction, which can avoid the inconvenience of repeatedly connecting and disconnecting the needle and increase the infection rate compared with manual suction. DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of the drawings.

[0019] Figure 1 It is a structure diagram of the pleural effusion suction negative pressure aspirator of the utility model embodiment one.

[0020] Figure 2 It is a sectional view of the liquid discharge device of the utility model embodiment two.

[0021] Figure 3 It is the utility model embodiment two Figure 2 The enlarged view of A in the utility model embodiment two.

[0022] Key reference numerals in the attached drawings: 1. Storage bottle; 2. First interface; 3. Second interface; 4. Drainage tube; 5. Needle seat; 6. Puncture needle; 7. Vacuum pump; 8. Controller; 9. One-way valve; 10. One-way air inlet valve; 11. Rotary seat; 12. Operating lever; 13. Groove; 14. Push rod; 15. Drain hole; 16. Flow channel. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Example 1: As Figure 1 As shown, a pleural effusion aspiration negative pressure suction device includes a reservoir bottle 1. The reservoir bottle 1 is made of transparent material and has a scale indicating the relative capacity, avoiding the error and inconsistency of traditional methods that calculate the total amount by adding the volumes of each tube. The reservoir bottle 1 is provided with a first interface 2 and a second interface 3. The first interface 2 is connected to a puncture needle assembly through a drainage tube 4, and the second interface 3 is connected to a negative pressure assembly through a connecting tube. The puncture needle assembly is used for puncturing the pleural cavity, and the negative pressure assembly is used to generate negative pressure to aspirate the effusion in the pleural cavity into the reservoir bottle 1.

[0026] The puncture needle assembly includes a needle seat 5 connected with the drainage tube 4, a puncture needle 6 connected with the needle seat 5, the puncture needle 6 adopts a 14G thin-walled puncture needle 6 (outer diameter 2.1mm, inner diameter 1.8mm), the negative pressure assembly includes a vacuum pump 7 connected with the connecting pipe, a controller 8 electrically connected with the vacuum pump 7, a piezoresistive sensor arranged in the needle seat 5, the vacuum pump 7 adopts a brushless motor vacuum pump 7, the controller 8 adopts an STM32 microcontroller 8, the controller 8 is surface-integrated with an LCD display screen, can display the cumulative liquid pumping volume, the current negative pressure value and the flow rate in real time, and is equipped with a physical knob (for presetting the target liquid pumping volume and the maximum negative pressure threshold value), the piezoresistive sensor is electrically connected with the controller 8, and the controller 8 controls the power of the vacuum pump 7 according to the negative pressure information of the piezoresistive sensor.

[0027] The specific controller 8 is automatically controlled by a resistance adaptive algorithm: based on a pleural effusion viscosity-pressure relationship model (formula: ΔP = 8μLQ / πr 4 ), ΔP represents negative pressure, μ represents the viscosity of the effusion; L represents the length of the drainage tube 4; Q represents the effusion pumping flow rate, and r represents the radius of the drainage tube 4. The piezoresistive sensor senses the negative pressure intensity in the needle seat 5, and transmits the negative pressure information to the controller 8, when the controller 8 senses that ΔP is abnormal, the power of the vacuum pump 7 is automatically adjusted, so that the Q value is stable.

[0028] Working principle: after the puncture needle 6 is successfully punctured, the target liquid pumping volume (such as 1200ml) and the maximum negative pressure limit value (such as-20kPa) are set through the physical knob;

[0029] After starting, the system pumps at an initial negative pressure of-10kPa, and the piezoresistive sensor samples the ΔP value once every 100ms, when it is detected that ΔP rises, the PID controller 8 increases the pump power in proportion (such as every ΔP+1kPa corresponds to negative pressure+0.5kPa), and maintains the flow rate at 3ml / s±0.5ml / s.

[0030] The one-way valve 9 electrically connected with the controller 8 is arranged on the drainage tube 4 and the connecting pipe, the one-way valve 9 is a one-way electromagnetic valve. When the system reaches the preset liquid pumping volume, the electromagnetic valve will be automatically closed. In addition, the top of the liquid storage bottle 1 is also provided with a one-way air inlet valve 10 electrically connected with the controller 8, and the air inlet valve is also an electromagnetic valve. Through the instruction of the controller 8, the one-way air inlet valve 10 can also be controlled to carry out air inlet operation, so as to allow external air to enter the liquid storage bottle 1 to improve the negative pressure value.

[0031] Embodiment two: as Figure 2 , Figure 3The embodiment is based on the embodiment one, and the liquid discharging device is further arranged at the bottom of the liquid storage bottle 1; in the case that the liquid in the liquid storage bottle 1 is too much or needs to be temporarily extracted for detection, the liquid discharging device at the bottom of the liquid storage bottle 1 can be used to discharge the liquid, so that more convenient operation is realized; the liquid discharging device comprises a rotating seat 11 arranged at the bottom of the liquid storage bottle 1, a mounting hole arranged on the rotating seat 11, and a top rod 14 movably mounted in the mounting hole; the mounting hole is a cylindrical hole, and the top rod 14 is a cylindrical rod matched with the mounting hole; the bottom of the liquid storage bottle 1 is provided with a liquid discharging hole 15 communicated with the top rod 14; the top rod 14 is provided with a flow channel 16 penetrating through the top rod 14 from top to bottom; the inlet of the flow channel 16 is located on the side wall of the top rod 14; the accumulated liquid in the liquid storage bottle 1 can flow out of the top rod 14 through the flow channel 16 and the liquid discharging hole 15, and the flow channel 16 and the liquid discharging hole 15 can be controlled to be connected or disconnected by moving the top rod 14.

[0032] Working principle: in the case that the accumulated liquid in the liquid storage bottle 1 needs to be discharged, the suction system should be closed first to stop operation. Then, the rotating seat 11 is rotated to adjust the position of the top rod 14 to be aligned with the liquid discharging hole 15. Then, the top rod 14 is moved upward to be inserted into the liquid storage bottle 1, so that the flow channel 16 is connected with the inside of the liquid storage bottle 1, and the accumulated liquid can be discharged through the flow channel 16. In order to facilitate the movement of the top rod 14, the bottom of the rotating seat 11 is designed with a groove 13 communicated with the mounting hole, and the bottom of the top rod 14 is located in the groove 13. One side of the top rod 14 is connected with an operating rod 12, one end of the operating rod 12 is connected with the top rod 14, and the other end of the operating rod 12 extends to the outside of the rotating seat 11, so that the top rod 14 can be easily moved up and down through the operating rod 12. After the accumulated liquid is discharged, the container can be placed below the top rod 14 for collection. After the collection is completed, the top rod 14 is moved downward, and the rotating seat 11 is rotated again to make the top rod 14 deviate from the liquid discharging hole 15. In order to enhance the sealing performance of the liquid discharging hole 15, a silica gel valve (for example, a cross-shaped silica gel valve) is arranged in the liquid discharging hole 15.

[0033] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. A pleural effusion suction negative pressure aspirator, characterized by, The application relates to a liquid storage bottle, which comprises a liquid storage bottle (1), a first interface (2) and a second interface (3) arranged on the liquid storage bottle (1), wherein the first interface (2) is connected with a puncture needle assembly through a drainage tube (4), the second interface (3) is connected with a negative pressure assembly through a connecting tube, the puncture needle assembly comprises a needle seat (5) connected with the drainage tube (4) and a puncture needle (6) connected with the needle seat (5), the negative pressure assembly comprises a vacuum pump (7) connected with the connecting tube, a controller (8) electrically connected with the vacuum pump (7), a piezoresistance sensor arranged in the needle seat (5), the piezoresistance sensor is electrically connected with the controller (8), the controller (8) controls the power of the vacuum pump (7) according to the negative pressure information of the piezoresistance sensor, and the bottom of the liquid storage bottle (1) is further provided with a liquid discharge device.

2. The pleural effusion suction negative pressure aspirator according to claim 1, wherein, The liquid discharge device comprises a rotating seat (11) rotatably arranged at the bottom of the liquid storage bottle (1), a mounting hole arranged on the rotating seat (11), a top rod (14) movably arranged in the mounting hole, a liquid discharge hole (15) arranged at the bottom of the liquid storage bottle (1) and communicated with the top rod (14), and a flow channel (16) arranged in the top rod (14) and penetrating the top rod (16) from top to bottom, wherein the movement of the top rod (14) can control the on-off between the flow channel (16) and the liquid discharge hole (15).

3. The pleural effusion suction negative pressure aspirator of claim 2, wherein, The liquid discharge hole (15) is provided with a silica gel valve.

4. The pleural effusion suction negative pressure aspirator according to claim 2, wherein, The bottom of the rotating seat (11) is provided with a groove (13) communicated with the mounting hole, the bottom of the top rod (14) is located in the groove (13), one side of the top rod (14) is connected with an operating rod (12), one end of the operating rod (12) is connected with the top rod (14), and the other end of the operating rod (12) extends out of the rotating seat.

5. The pleural effusion suction negative pressure aspirator according to claim 1, wherein, The drainage tube (4) and the connecting tube are provided with a one-way valve (9) electrically connected with the controller (8).

6. The pleural effusion suction negative pressure aspirator of claim 1, wherein, The top of the liquid storage bottle (1) is further provided with a one-way air inlet valve (10) electrically connected with the controller (8).

7. The pleural effusion suction negative pressure aspirator of claim 1, wherein, The liquid storage bottle (1) is a transparent liquid storage bottle (1) with a scale.

8. The pleural effusion suction negative pressure aspirator of claim 1, wherein, The controller (8) is an STM32 microcontroller (8).

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