RU190374U1 - Wearable device for drainage of human body cavities in the postoperative period with an impedance control system for the presence of exudate - Google Patents

Abstract

The utility model relates to medical equipment, in particular, wearable devices for drainage of human body cavities during the postoperative period. A device for effective removal of exudate creates negative pressure in the body's cavities to evacuate the exudate into a separate container after it enters the surgical area with an estimate of its amount using impedance measurements in this zone. At the same time, the device can be placed on the patient's body to preserve the mobility of the latter. In existing patents wearable aspirators are described, in which the negative pressure generated by the compressor is set by setting the maximum power limit by the user without taking into account the presence of exudate in the cavity being drained. The patented device solves the problem of reducing risk excessive injury to the wound cavity by optimizing the mode of supplying negative pressure to the drainage cavity, depending on ichiya it exudate.

Description

The invention relates to a medical product, in particular to wearable devices for the drainage of human body cavities during the postoperative period.

The main task of the device is the formation of negative pressure in the cavities of the human body to evacuate the exudate into a separate container after it enters the area of operational intervention with an assessment of its quantity by measuring the impedance in this area. In this case, the device can be placed on the patient's body to preserve the mobility of the latter.

Previous similar devices are described in patent documents EP 2010/004010 (07/02/2010), US 2004/0073151 A1, WO 2009/047524 A2, WO 2007/030599 A2, RU2543042C2 or EP 1905465 A1.

The closest analogue is the device described in RU2543042C2 "Device worn on the body of the user, ensuring the creation of a vacuum for medical use." The features that match the system described are:

- “A device that creates a vacuum on the user's body”;

“The vacuum generating device communicates through the suction tube to the wound or wound area.”

However, in the mentioned patents wearable aspirators are described, in which the magnitude of the constant negative pressure generated by the compressor is set by setting the maximum power limit by the user and does not take into account the presence of exudate in the drained cavity.

The constant negative pressure created in the drainage cavity, in the absence of exudate, can cause the cannula to stick to the walls of the wound cavity and create the risk of significant injury to the surrounding tissues. Therefore, the task of controlled evacuation of the exudate, with the possibility of switching on and off the negative pressure at the moment of absence of exudate in the wound canal, is relevant during the ongoing postoperative procedures.

The patented device solves the problem of reducing the unnecessary risk of injury to the wound cavity by optimizing the mode of supplying negative pressure to the drainable cavity, depending on the presence of exudate in it. This result is achieved due to the fact that the device contains an impedance sensor in its working part and a control unit that allows the system to respond to external events in accordance with a predetermined algorithm. The device regularly conducts measurements of the impedance value in the wound cavity and compares it with a certain threshold value set during device calibration. With the growth of the measured impedance value and the transition of the value above the impedance response threshold, the control unit turns on the compressor to create a negative pressure and evacuate the exudate from the wound cavity. When the measured impedance value decreases and the value goes below the impedance response threshold, the control unit turns off the compressor to stop the supply of negative pressure at the moment of absence of exudate in the wound cavity and to avoid the risk of excessive injury to the tissue surrounding the cannula.

The layout of the device depicted in figure 1.

The device contains a tube (2), which is connected at one end to a cannula (1) placed in the patient's body, and the other end to an exudate collection container (3), and the compressor (4) that forms a negative pressure is connected to the container by a tube (5 ). At the same time, the microcontroller control unit (6) controls the operation of the compressor, which creates a negative pressure through an adjustable power supply unit (7), which generates a PWM signal. At the same time, the data input / output unit (8) allows you to set parameters and output data for control by the user. At the same time, the impedance sensor (9) is placed in the cannula, connected to the microcontroller control unit and allows you to react to a lack of exudate event in the wound cavity, and the overflow sensor (10) is placed in the container for collecting exudate, connected to the microcontroller control unit and allows you to react to the event overflow container for collecting exudate and turn off the compressor device and display the overflow using an I / O unit with a beep sound.

The device works as follows. A generated sinusoidal signal is fed from the control unit to the impedance sensor. The measured voltage through the amplifier is fed to the control unit and converted to binary code for the subsequent calculation of the value of the impedance of the exudate. Thus, when the wound channel is filled with exudate, the impedance value drops to a certain threshold value in the sensor location area, serves as a signal of the accumulation of exudate in the corresponding area of surgical intervention. The achievement of this threshold serves as an event for which the control unit turns on the compressor, and then, when the exudate is removed from the surgical wound, the impedance in which increases, and when its certain threshold value is reached, the compressor is turned off.

This is achieved by optimizing the operation of the device and the removal of exudate upon its subsequent admission to the operating wound.

Claims (1)

A wearable device for drainage of human body cavities, containing a cannula with an impedance sensor, a tube connecting the cannula to an exudate collection container, a tube connecting the container to the compressor to create a negative pressure in the wound cavity, an impedance sensor, the output of which, in turn, is connected to a control unit that implements a predetermined algorithm for the operation of the device by regulating the voltage on the controlled power supply and includes, in addition to reacting to the events generated by the input unit Yes, the output of user data, as well as handling of events related to the overflow of the container and the presence of exudate in the wound cavity.

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