CN201664463U - A hand-held low-power wound negative pressure therapy instrument - Google Patents

Abstract

The utility model relates to a hand-held negative pressure wound therapeutic apparatus of low power consumption. One end of a rubber tube of medical use is inserted in a wound dressing cavity, and the other end of a rubber tube of medical use is connected to a mini air pump. A button for setting parameter is used to control circuit, and an air pressure sensor which collects the air pressure in the suction pipe of the mini air pump inputs the signal to a MCU circuit for treatment. The MUC circuit outputs the control signal to an air pump, a buzzer-driven circuit and a solenoid valve driven circuit, and the output work state index is displayed on a LCD display. A regulated power supply circuit provides power desired for each circuit. The utility model is advantageous in that firstly user-friendly performance, convenient carrying and low noise are achieved; secondly a plurality of treatment modes with high intellectualization are provided; thirdly power supply of over six hours is achieved by using three common batteries of 1.5V and battery replacing is easy; fourthly the hand-held negative pressure wound therapeutic apparatus of low power consumption is suitable for small wound treatment.

Description

A hand-held low-power wound negative pressure therapy instrument

technical field

The utility model relates to a medical device, in particular to a hand-held low-power wound surface negative pressure therapeutic instrument.

Background technique

Negative pressure wound therapy (NPWT) is a new method to accelerate wound healing that has emerged in recent years and has been widely used in the treatment of a series of difficult-to-heal wounds, including acute, chronic, and infected wounds. This technology not only enhances the drainage effect of the wound surface, but also can significantly speed up the closure of the infected cavity, promote wound healing, greatly reduce the use of antibiotics, effectively prevent the occurrence of infection, shorten the hospitalization time of patients, relieve the pain of patients, and reduce the number of medical staff. workload. At present, there are negative pressure therapy devices using this technology in the Chinese market, such as the Zn100 negative pressure therapy device for wounds produced by Beijing Dimedel Technology Co., Ltd. Although this product can achieve the above functions, it is expensive and too large. Especially when used outdoors, it is not easy to carry, and because the power of the air pump is large, the noise is high during work, which seriously affects the mood of the patient.

Contents of the invention

The utility model aims at the problem that the wound negative pressure therapeutic instrument is expensive and inconvenient to carry, and proposes a hand-held low-power wound negative pressure therapeutic instrument, which is designed with an ultra-low power consumption single-chip processor and a miniature air pump, and uses an LCD Display information such as negative pressure parameters and working modes. Compared with this type of product on the market, it is cheap, smart to use, easy to carry, low noise, and provides multiple treatment modes at the same time, with a high degree of intelligence.

The technical scheme of the utility model is: a hand-held low-power wound negative pressure treatment instrument, including a wound dressing chamber, a medical rubber tube, and a micro air pump. One end of the medical rubber tube is inserted into the wound dressing chamber, and the other end is connected to a micro air pump. It also includes a single-chip microcomputer circuit, a regulated power supply circuit, a button control circuit, an air pump, a buzzer drive circuit, a solenoid valve drive circuit, an air pressure sensor, an LCD display, a button control circuit for setting parameters, and an air pressure sensor for collecting the air pressure in the exhaust pipe of a micro air pump The signal is input to the single-chip microcomputer circuit for processing, the single-chip microcomputer circuit outputs control signals to the air pump, buzzer drive circuit and solenoid valve drive circuit, and the output working status indicators are displayed on the LCD display, and the regulated power supply circuit provides the required power for each circuit.

The MSP430F149 model single-chip microcomputer is selected for the single-chip circuit, the ULN2003A chip is selected for the air pump and the buzzer drive circuit, the output signal of the IO port of the single-chip microcomputer is amplified by the signal of the ULN2003 chip, the P1.0 of the single-chip microcomputer is connected to the first channel of ULN2003A, and the P1. 1 Connect to the second channel of ULN2003A.

The air pressure sensor is connected in series through a 4.7K and 2K resistor, and the signal is dropped and then transmitted to the P6.0AD conversion port of the single-chip microcomputer.

The micro air pump adopts a diaphragm vacuum pump-GAST, the model of the air pressure sensor is MPXV7025G, and the model of the solenoid valve is KSV04E-3A DC3V.

The beneficial effect of the utility model is that: the utility model handheld low-power wound negative pressure therapy instrument has the advantages of dexterous use, convenient portability, low noise, and provides multiple treatment modes at the same time, with a high degree of intelligence. Powered by V battery, it can supply power for more than 6 hours continuously, and it is easy to replace the battery. It is mainly used for the treatment of small wounds.

Description of drawings

Fig. 1 is the structural block diagram of the utility model hand-held low-power wound negative pressure therapy instrument;

Fig. 2 is the circuit diagram of the MSP430 single-chip microcomputer of the utility model hand-held low-power wound negative pressure therapy instrument;

Fig. 3 is the circuit diagram of the stabilized power supply of the handheld low-power wound negative pressure treatment instrument of the present invention;

Fig. 4 is a key control circuit diagram of the hand-held low-power wound negative pressure therapeutic instrument of the present invention;

Fig. 5 is the drive circuit diagram of the air pump and buzzer of the utility model handheld low-power wound negative pressure treatment instrument;

Fig. 6 is a driving circuit diagram of the solenoid valve of the handheld low-power wound negative pressure treatment instrument of the present invention;

Fig. 7 is a working circuit diagram of the air pressure sensor of the hand-held low-power wound negative pressure therapy instrument of the present invention.

Detailed ways

As shown in Figure 1, the structural block diagram of the handheld low-power wound treatment instrument includes a wound dressing chamber, a medical rubber tube, a micro air pump, a single-chip microcomputer circuit 1, a regulated power supply circuit 5, a button control circuit 6, an air pump, and a buzzer drive Circuit 7, solenoid valve drive circuit 8, air pressure sensor 9, LCD display 10, one end of the medical rubber tube is inserted in the wound dressing chamber, one end is connected to the micro air pump, the button for setting parameters controls the circuit 6 and collects the air pressure in the air pressure of the micro air pump exhaust pipe The sensor 9 inputs the signal into the single-chip microcomputer circuit 1 for processing, and the output of the single-chip microcomputer circuit 1 controls the solenoid valve through the solenoid valve drive circuit 8, controls the buzzer and the micro air pump through the drive circuit 7, and outputs the working status index to the LCD display 10 for display, voltage stabilization The power circuit 5 provides required power for each part of the circuit.

The button control circuit 6 can set the negative pressure parameter. When the air pump starts to work, the air pressure sensor 9 continuously collects the air pressure in the suction pipe. When the set air pressure parameter is reached, the air pump stops working. Under the action of negative pressure, the medical sponge can absorb the congestion and excrement in the wound dressing chamber.

As shown in Figure 2, the MSP430 single-chip circuit 1 includes a single-chip microcomputer, a reset circuit 2, a crystal oscillator circuit 3, and a power detection circuit 4. In the entire circuit, two power supplies are provided, and the surrounding circuits of the single-chip microcomputer and the button control circuit are powered by a 3.3V power supply. The air pump and buzzer drive circuits are powered by 4.5V. Reset circuit 2, when you need to reset the negative pressure parameters and working mode, you can press the reset button to start again; crystal oscillator circuit 3, provide 8MHZ driving signal for the single-chip microcomputer; power detection circuit 4, when the battery power is low, the most obvious It means that the battery power supply voltage is lowered, but since the normal power supply voltage of the battery is 4.5V, and the power supply voltage of the single-chip microcomputer is not allowed to exceed 3.3V, in order to be able to collect the battery voltage signal, here we use two resistors in series to step down, and then the step-down signal It is transmitted to the P6.1 interface of the microcontroller for AD conversion; Figure 3 is the power control circuit, the P4.5 interface is connected to both ends of the series battery, and then the AMS117-3.3 chip is stepped down to generate a 3.3V voltage for the microcontroller and its peripherals The circuit is used, the capacitors before and after the chip can eliminate the interference signal and stabilize the voltage at a constant value; Figure 4 shows the switch control circuit, there are three control switches, namely S1 start/stop switch, S2 mode selection switch and S3 parameter setting Switches, S1, S2, and S3 are respectively connected to P1.4, P1.5, and P1.6 of the MSP430F149 single-chip microcomputer; Figure 5 is the driving circuit, because the driving capacity of the IO port of the single-chip microcomputer is insufficient, and the driving voltage of the micro air pump needs 4.5V, so use The ULN2003A chip can improve the driving ability, and can amplify the 3.3V weak current signal output by the microcontroller to a 4.5 strong current signal. As shown in Figure 5, P1.0 of the microcontroller is connected to the first channel of ULN2003A, and P1.1 is connected to ULN2003A Figure 6 is the solenoid valve drive circuit, the working voltage of the solenoid valve is 3V, so it can be directly driven by a triode circuit; Figure 7 is the air pressure sensor circuit, the working voltage is 4.5V, and a 4.7K and 2K resistor is used Connected in series, drop the output signal to 3V and then transmit it to P6.0 for AD conversion by the single-chip microcomputer.

When using the device, first press the S1 button for 3 seconds, the negative pressure therapy device starts to start, and enters the programming mode before work. The device has three working modes: In mode A, when the air pressure in the dressing cavity reaches the set When the air pressure reaches the set parameter, the air pump stops working, and when the air pressure is lower than the set air pressure, the air pump restarts until it reaches the set air pressure again and stops and circulates continuously; in B mode, when the air pressure in the dressing cavity reaches the set parameter, it keeps The air pressure remains unchanged for 5 minutes, then deflate through the control solenoid valve, and recirculate the pumping after 30 seconds; in C mode, the air pump works continuously, and the maximum negative pressure can reach 180mmHG, until the pumping ends when the stop button is pressed. Patterns should be used sparingly. After pressing S2 to set the working mode, press S1 to enter the negative pressure parameter setting. The initial setting value is negative 50mmHG. Each time S3 is pressed, it will increase by 15mmHG. When it reaches the maximum value, it will return to negative 50mmHG. Then press S1 to exit the programming mode, and when you press S1 again, the micro air pump starts to pump air and enters normal operation. In the process of medical treatment, the current air pressure in the exhaust pipe and the accumulated medical treatment time are dynamically displayed. If the set negative pressure value cannot be reached within 1 minute, an alarm will be issued automatically, the buzzer will sound, and the air leakage icon will be displayed. Occasionally, medical staff will be required to redress the wound. If during the medical treatment, press S1 to suspend the medical treatment, and press S1 again to restart the medical treatment. At the end of use, just press and hold the S1 button for 3 seconds, the buzzer will sound twice, and the controller will automatically shut down.

Claims (4)

1. the low-power consumption Wound-surface negative pressure therapeutic instrument of a hand-held, comprise the wound dressing chamber, medical rubber hose, micro air pump, medical rubber hose one end is inserted in the wound dressing chamber, one end connects micro air pump, it is characterized in that, also comprise single chip circuit, voltage-stabilized power supply circuit, the button control circuit, air pump, buzzer drive circuit, driving circuit for electromagnetic valve, baroceptor, LCD display, the button control circuit that parameter is set is input to signal in the single chip circuit with the baroceptor of gathering micro air pump exhaust tube internal gas pressure to be handled, single chip circuit outputs a control signal to air pump, buzzer drive circuit and driving circuit for electromagnetic valve, the output services state index shows that to LCD display voltage-stabilized power supply circuit provides required power supply for each circuit.

2. according to the low-power consumption Wound-surface negative pressure therapeutic instrument of the described hand-held of claim 1, it is characterized in that, described single chip circuit is selected MSP430F149 model single-chip microcomputer for use, described air pump, buzzer drive circuit are selected the ULN2003A chip for use, single-chip microcomputer IO mouth output signal is amplified by the ULN2003 chip signal, the P1.0 of single-chip microcomputer inserts the first passage of ULN2003A, and the P1.1 of single-chip microcomputer inserts the second channel of ULN2003A.

3. according to the low-power consumption Wound-surface negative pressure therapeutic instrument of the described hand-held of claim 1, it is characterized in that described baroceptor output signal is carried out the AD conversion through a 4.7K and 2K resistance series connection dividing potential drop with being transferred to single-chip microcomputer P6.0 after the signal drops.

4. according to the low-power consumption Wound-surface negative pressure therapeutic instrument of the described hand-held of claim 1, it is characterized in that described micro air pump adopts diaphragm type vacuum pump-GAST, the baroceptor model is MPXV7025G, and electromagnetic valve model is KSV04E-3A DC3V.

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