CN102500001A - Measuring and control system for suction device - Google Patents

Abstract

The invention relates to a measurement and control system of a suction device, which includes a vacuum pump, a suction bottle, a suction bottle cap, a suction tube, a suction hose, an electromagnetic vacuum valve, a controller, a pressure sensor, an amplifier, an alarm and a pressure setting circuit unit, the pressure The sensor is embedded and sealed in the suction bottle cap, the center of the pressure sensor coincides with the center of the suction bottle cap, the center line of the pressure sensor coincides with the vertical bisector of the suction tube and suction hose insertion hole on the suction bottle cap, and the wiring of the pressure sensor passes through the terminal It leads out of the suction bottle cap and is sealed and connected with the junction of the suction bottle cap. The present invention arranges the pressure sensor in the suction bottle cap, the measured pressure has small pulsation, and is pressed close to the patient's body, and the control of the suction process is accurate, and cooperates with the alarm circuit to prompt the operator to run safely.

Description

Measurement and Control System of Suction Device

technical field

The invention relates to a suction device for medical equipment, in particular to a system for measuring and controlling the suction device.

Background technique

At present, the automatic measurement and control system of medical suction devices generally consists of negative pressure suction devices, pressure sensing and amplification circuits, vacuum pumps, controllers and microprocessors. Before suction, the allowable value of negative pressure needs to be set in advance. When the system is running, the pressure sensing and amplifying circuit installed near the pump port in the suction device converts the measured negative pressure into an amplified electrical signal, which is then converted into The digital signal is passed to the microprocessor, and the feedback is controlled. When the negative pressure value reaches the preset value, the microprocessor controls the suction device to alarm or shut down, thereby achieving the purpose of automatic control of the negative pressure value.

Since the power source of the conventional suction device is a circulating vacuum pump, the air pressure at the pump port fluctuates greatly, and the pressure sensor is installed on the circuit board in the suction device. The measured values also fluctuate significantly.

In order to prevent suction damage to the patient, the set suction negative pressure allowable value is usually the safe negative pressure limit that the patient can bear, and in order to achieve rapid suction, it is always desirable to increase the differential pressure between the pump port and the end of the suction hose , to increase the suction flow, that is, to increase the negative pressure at the pump port as much as possible on the basis of ensuring the safety of the patient. In fact, the pressure that actually causes the patient's injury is generally not the transient pressure spike at the pump port that slightly exceeds the set value, but the effective pressure that breaks through the set value and continues to act on the patient for a period of time, so the pressure sensor The optimal setting should avoid the influence of fluid pressure gradient and pulsation between the pump port and the patient on the pressure measurement, directly measure the pressure at the patient's body at the end of the suction hose, and calculate the effective value or average value of the pressure at this place by the controller. Characterizes the effective pressure on the patient. In view of the fact that the peak air pressure at the pump port of the current suction equipment is likely to cause false alarms or stop operation of the suction device, the present invention proposes a new measurement and control technology for the suction equipment.

Contents of the invention

The present invention aims to solve the technical problems of simple measurement and control means of the existing suction device, low degree of intelligence, and great influence of pulsating negative pressure, and provides a measurement and control system of the suction device. The system sets the pressure sensor in the suction bottle cap, The negative pressure at the patient's body is detected, and the controller is used for pressure feedback control.

The technical solution of the present invention is: a measurement and control system of a suction device, including a vacuum pump, a suction bottle, a suction bottle cap, a suction tube, a suction hose, an electromagnetic vacuum valve, a controller, a pressure sensor, an amplifier, an alarm and a pressure setting The circuit unit is characterized by: the pressure sensor is embedded and sealed in the suction bottle cap, the center of the pressure sensor coincides with the center of the suction bottle cap, the center line of the pressure sensor and the vertical bisector of the suction tube and the suction hose insertion hole on the suction bottle cap Coincidentally, the wiring of the pressure sensor is led out of the suction bottle cap through the binding post, and is sealed and connected with the junction of the suction bottle cap.

The suction bottle cap is an insulating plastic thin bottle cap. There are two through holes passing through the suction tube and the suction hose on the suction bottle cap. The suction tube and the suction hose are respectively inserted in the two through holes. The vacuum pumps are connected together, a bypass is provided on the suction pipe, and an electromagnetic vacuum valve is installed on the bypass.

The thickness of the suction bottle cap at the contact point between the suction bottle cap and the pressure sensor is ≥1mm; the wiring of the pressure sensor is a shielded wire.

The signal input end of the controller is respectively connected with the pressure setting circuit unit and the amplifier, the amplifier is connected with the pressure sensor, the output end is connected with the alarm unit, and the electromagnetic vacuum valve is connected with the controller.

The beneficial effect of the present invention is that: the present invention sets the pressure sensor in the suction bottle cap, the measured pressure has small pulsation, and is close to the patient's body to be pressed, the control of the suction process is accurate, and the cooperation with the alarm circuit can prompt the operator to run safely.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a sectional view along A-A of the suction bottle cap in Fig. 1 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the measurement and control system of the suction device of the present invention comprises a vacuum pump, a suction bottle 6, a suction bottle cap 4, a suction tube 2, a suction hose 5, an electromagnetic vacuum valve 1, a controller, a pressure sensor 3, an amplifier , Alarm and pressure setting circuit unit. the

The pressure sensor 3 is embedded and sealed in the suction bottle cap 4, the center of the pressure sensor 3 coincides with the center of the suction bottle cap 4, the center line of the pressure sensor 3 is perpendicular to the insertion hole of the suction tube 2 and the suction hose 5 on the suction bottle cap 4 The bisector coincides, and the wiring of the pressure sensor 3 leads out of the suction bottle cap 4 through the binding post, and is sealed and connected with the junction of the suction bottle cap 4 .

The suction bottle cap 4 is an insulating plastic thin bottle cap. The suction bottle cap 4 is provided with two through holes passing through the suction tube 2 and the suction hose 5. The suction tube 2 and the suction hose 5 are respectively inserted in the two through holes. , wherein, the suction pipe 2 is connected with the vacuum pump, the suction pipe 2 is provided with a bypass, and the electromagnetic vacuum valve 1 is installed on the bypass.

The signal input end of the controller is respectively connected to the pressure setting circuit unit and the amplifier, the amplifier is connected to the pressure sensor 3, the output end is connected to the alarm unit, and the electromagnetic vacuum valve 1 is connected to the controller.

The suction bottle 6 collects the sucked fluid, and the air pressure signal in the suction bottle 6 output by the pressure sensor 3 embedded in the suction bottle cap 4 is amplified by the amplifier and output after nonlinear correction, and the controller receives the limit pressure setting signal and the output signal of the amplifier , when the air pressure signal exceeds the pressure setting value, the controller will send out an alarm and open the electromagnetic vacuum valve 1. The electromagnetic vacuum valve 1 adopts a small electromagnetic vacuum valve with the patent number ZL200810202846.8, which is installed on the bypass pipeline of the vacuum pump port, and is driven by the controller to operate. After opening, it can bypass the air flow of the vacuum pump and release the negative pressure of the pipeline. After the electromagnetic vacuum valve 1 is closed, there is no bypass suction, and the controller can receive a feedback signal after the electromagnetic vacuum valve 1 is activated.

As shown in Figure 2, there are two through holes passing through the suction tube 2 and the suction hose 5 on the suction bottle cap 4, the suction bottle cap 4 is made of insulating plastic thin bottle cap, and a strain gauge pressure gauge is embedded in the suction bottle cap 4. The thickness of the suction bottle cap at the contact point between the sensor 3 and the suction bottle cap 4 and the pressure sensor 3 is not less than 1mm, so as to ensure that the suction bottle cap has sufficient mechanical strength. The pressure sensor 3 and its wiring have no gap at the junction of the suction bottle cap 4 and the suction bottle cap 4, and the center of the pressure sensor 3 coincides with the center of the suction bottle cap 4, and the centerline of the pressure sensor 3 and the suction bottle cap 4. The vertical bisectors of the double holes overlap to ensure that the pressure sensor 3 can be axisymmetrically and uniformly stressed and deformed along with the pressure deformation of the suction bottle cap 4, and the pressure sensor 3 is wired out of the suction bottle cap by the terminal 7.

During operation, the allowable limit pressure is first set through the pressure setting circuit unit, and the suction device starts to operate after the pressure is confirmed.

During the suction process, the air pressure in the suction bottle 6 is lower than the ambient air pressure outside the bottle, so the plastic suction bottle cap 4 will undergo a slight concave deformation to varying degrees under the action of negative pressure, and the strain gauge pressure sensor 3 embedded in the bottle cap will pass through. The binding post 7 that leads to attract the bottle cap receives electric energy, and converts the deformation into an electric signal and transmits it to the amplifier for amplification and nonlinear correction. In view of the fact that the suction bottle cap 4 has no obvious deformation after being used for many times, the short-term deformation of the suction bottle cap 4 during operation can ignore the amount of plastic deformation, and is approximately an ideal elastic deformation. Due to the influence of the pressure gradient, the negative pressure at the pump port is not equal to the negative pressure at the terminal port of the suction hose 5, and the negative pressure at the vacuum pump port fluctuates greatly, and the suction bottle 6 acts as an accumulator in the pipeline. The pressure acting on the human body after the suction bottle 6 is just relatively stable, so the elastic deformation of the suction bottle cap 4 belongs to low-frequency deformation, and the pressure measured by the pressure sensor 3 is also a low-frequency amount. The pressure sensor 3 is located in the suction bottle cap 4. The frequency response requirements from the pressure sensor 3 to the controller circuit are reduced, and the hardware cost of the circuit is reduced. The measured pressure is not only convenient for data processing by the controller, but also approximates the pressure of the human body. In order to prevent interference, the connecting wire of the pressure sensor 3 adopts a shielded wire. When the wire connected to the pressure sensor 3 falls off or becomes loose, the controller drives the alarm circuit to issue a warning.

During the suction process, the controller receives the limit pressure setting signal and the output signal of the amplifier. When the measured negative pressure is lower than the pressure setting value, the suction device is operating normally. Otherwise, the controller will send out an alarm and open the electromagnetic vacuum valve 1. The electromagnetic vacuum valve 1 is installed at the vacuum pump port. After opening, it can bypass the vacuum pump airflow from the negative pressure source and release the negative pressure in the pipeline. When the measured value of the pressure sensor 3 is lower than the set pressure for a few seconds, the controller drives the Electromagnetic vacuum valve 1 is closed and continues to attract without bypass. After the electromagnetic vacuum valve 1 is activated, the controller can receive a feedback signal to confirm that the electromagnetic vacuum valve 1 is opened and closed successfully.

Claims (4)

1. the TT&C system of a suction device; Comprise vacuum pump, suction bottle (6), attraction bottle cap (4), suction catheter (2), attract flexible pipe (5), electromagnetic type vacuum valve (1), pressure transducer (3), controller, amplifier, warning and pressure setting circuit unit; It is characterized in that: said pressure transducer (3) is imbedded and is enclosed in and attracts in the bottle cap (4); Pressure transducer (3) center overlaps with attracting bottle cap (4) center; Pressure transducer (3) centrage overlaps with the perpendicular bisector that attracts bottle cap (4) to go up suction catheter (2) and attraction flexible pipe (5) patchhole; Pressure transducer (3) wiring is drawn through binding post and is attracted outside the bottle cap (4), and is tightly connected with attracting bottle cap (4) junction.

2. the TT&C system of suction device according to claim 1; It is characterized in that: said attraction bottle cap (4) is the thin bottle cap of ambroin class, attracts to have two through holes that pass through suction catheter (2) and attract flexible pipe (5) on the bottle cap (4), is inserted with suction catheter (2) in two through holes respectively and attracts flexible pipe (5); Wherein, Suction catheter (2) is connected with vacuum pump, and suction catheter (2) is provided with bypass, and electromagnetic type vacuum valve (1) is housed in the bypass.

3. the TT&C system of suction device according to claim 1 is characterized in that: the attraction bottle cap thickness >=1mm of said attraction bottle cap (4) and pressure transducer (3) contact position; Said pressure transducer (3) wiring is a shielding line.

4. the TT&C system of suction device according to claim 1; It is characterized in that: said controller signals input connects pressure setting circuit unit and amplifier respectively; Amplifier is connected with pressure transducer (3); Outfan connects alarm unit, and electromagnetic type vacuum valve (1) is connected with controller.

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