CN111067557A - Patient breath holding monitoring device and method applied to CT scanning - Google Patents
Patient breath holding monitoring device and method applied to CT scanning Download PDFInfo
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Abstract
The invention discloses a patient breath-holding monitoring device and method applied to CT scanning. The breathing mouthpiece comprises a biting part and a combining part, and the bottom opening of the biting part is communicated with the combining part; the breath-holding monitoring host comprises a shell, a breath sensor and a host circuit board, wherein the breath sensor is connected to the conductor groove of the host circuit board through a conductive plug, the shell is provided with a main air passage and an air inlet and outlet of the breath sensor, and the main air passage of the breath sensor is communicated with the air inlet and outlet; the two ends of the air duct are respectively provided with a connector, one connector of the air duct is communicated with the joint part of the breathing mouthpiece, and the other connector of the air duct is communicated with the main air passage of the breathing sensor. By implementing the invention, the breath holding condition of the patient during CT scanning is directly monitored by placing the breathing mouthpiece at the mouth of the patient, the quality of CT scanning images is improved, and the accuracy of CT diagnosis results is improved.
Description
Technical Field
The invention relates to the field of medical detection equipment, in particular to a patient breath holding monitoring device and method applied to CT scanning.
Background
Radiologists often find at chest-abdominal CT scans: the image is unclear, misdiagnosis or incomplete scanning due to the artifact caused by the motion. The main reason for this is the motion artifact caused by the breathing or swallowing movement of the patient during the scanning process, which affects the quality of the CT scanning image, and thus the lesion part cannot be clearly identified. The common chest examination generally needs breathing for two times, one time is positioning image, and the other time is formal tomography. In order to avoid the increase of the radiation amount caused by the supplementary scanning and the repeated scanning, the amount of each inspiration of the patient is kept as consistent as possible, and the breath holding during the scanning process is ensured. Because the patient does not hold up during the CT scanning process, the breathing movement is generated, and the CT image is blurred. If the patient does not hold his breath during the CT scan, the CT images will be overlapped and blurred, which seriously affects the quality of the images and hinders the diagnosis of the doctor. Therefore, it is necessary to provide a device for detecting the breath holding of a patient by monitoring the flow of gas to monitor the breath holding of the patient, so as to improve the quality of CT images and assist a doctor in improving the diagnosis accuracy of CT scanning.
Disclosure of Invention
In order to overcome the above problems, the present invention provides a device and a method for monitoring breath holding of a patient for CT scanning, which aims to solve the technical problem of how to detect the breath holding degree of the patient during CT scanning to improve the quality of CT scanning images.
In order to achieve the purpose, the invention provides a patient breath-holding monitoring device, which comprises a breathing mouthpiece, an air duct and a breath-holding monitoring host, wherein the breathing mouthpiece is connected with the breath-holding monitoring host into an integral structure through the air duct, and the breath-holding monitoring host comprises: the breathing mouthpiece comprises a biting part and a combining part, and an opening at the bottom of the biting part is communicated with the cylindrical combining part; the breath-holding monitoring host comprises a shell, a breathing sensor and a host circuit board, wherein the breathing sensor and the host circuit board are arranged in the shell, the breathing sensor is connected to a conductor groove of the host circuit board through a conductive plug, the shell is provided with a main air passage and an air inlet and outlet of the breathing sensor, and the main air passage and the air inlet and outlet of the breathing sensor are communicated; the two ends of the air duct are respectively provided with a connector, one connector at one end of the air duct is communicated with the joint part of the breathing mouthpiece, and the connector at the other end of the air duct is communicated with the main air passage of the breathing sensor; host computer circuit board includes signal conditioning circuit, AD drive circuit, AD converting circuit, singlechip and bluetooth module, wherein: the respiration sensor is used for detecting the respiratory airflow of a patient from the air inlet and the air outlet, converting the detected respiratory airflow into an airflow electrical signal and outputting the airflow telecommunication to the signal conditioning circuit; the signal conditioning circuit is used for performing signal conditioning on the airflow electrical signal to remove signal noise interference and realize voltage following, and outputting the conditioned airflow electrical signal to the A/D driving circuit; the A/D driving circuit is used for differentially amplifying the airflow electrical signal output by the signal conditioning circuit and outputting the amplified airflow electrical signal to the A/D conversion circuit; the A/D conversion circuit is used for converting the airflow electrical signal output by the A/D driving circuit into an airflow digital signal and transmitting the airflow digital signal to the singlechip; the single chip microcomputer is used for reading the airflow digital signals from the A/D conversion circuit, calculating respiratory airflow data of a patient, and sending the respiratory airflow data of the patient to the wireless terminal through the Bluetooth module to be displayed.
Preferably, two sides of the edge of the inner opening of the biting part are respectively provided with a biting sheet, the upper surface and the lower surface of each biting sheet are respectively provided with anti-skid particles, and the arc outer side of each biting sheet is provided with an anti-skid patch.
Preferably, the output end of the respiration sensor is connected to the input end Vin1 of the signal conditioning circuit, the output end Vin2 of the signal conditioning circuit is connected to the input end Vin2 of the a/D driving circuit, the output end IN + of the a/D driving circuit is connected to the input end IN + of the a/D converter, the a/D converter is connected to the input end pin of the single chip microcomputer through the SPI bus, and the output end pin of the single chip microcomputer is connected to the input end of the bluetooth module.
Preferably, the host circuit board further comprises a built-in power supply, the power supply access terminals VCC of the respiration sensor, the signal conditioning circuit, the a/D driving circuit, the a/D conversion circuit, the single chip microcomputer and the bluetooth module are all connected to the output end of the built-in power supply, a power switch is arranged on one side of the shell of the screen gas monitoring host, and the power switch is electrically connected to the built-in power supply.
Preferably, the signal conditioning circuit comprises two proportional resistors R1 and R4, an operational amplifier of OPA4340 type, and a filter circuit composed of a resistor R2 and a capacitor C4.
Preferably, the a/D driving circuit includes an ADC driver of ADA4941 type, six voltage dividing resistors R16-R20 and R22, a matching resistor R21, and three filter capacitors C13, C14, and C17.
Preferably, the a/D conversion circuit includes an a/D conversion chip with model number AD7691, a filter circuit composed of two resistors R10 and R12 and two capacitors C10 and C11, three voltage dividing resistors R5, R6 and R8, three filter capacitors C5, C8 and C9, and four impedance matching resistors R9, R11, R13 and R14.
Preferably, the single chip microcomputer is a single chip microcomputer with a model number of 89C2051, pins XTAL 1-XTAL 2 of the single chip microcomputer are connected with an oscillation circuit formed by capacitors C6-C7 and a crystal oscillator Y1, a pin P1.0 is connected with a diode D2 and a resistor R7 in series, and a pin VPP/Rst is connected with a voltage protection circuit formed by a diode D1, a resistor R3 and a capacitor C1 and is connected with two filter capacitors C2-C3.
Preferably, the biting part is in the shape of a semicircular arc sheet, the screen monitoring host is in the shape of a cuboid or a cube, and the air guide pipe is an L-shaped hollow medical plastic pipe.
In another aspect, the present invention further provides a patient breath holding monitoring method applied to CT scanning, which is applied to the patient breath holding monitoring device, and the method includes the following steps: placing the breathing mouthpiece in the mouth of a patient, and starting a power switch of the breath-holding monitoring host; the method comprises the steps that the Bluetooth of the wireless terminal is opened to be matched with the Bluetooth of the patient breath-holding monitoring device, and a breath warning threshold value is set on breath-holding monitoring app software of the wireless terminal; detecting the respiratory airflow of a patient from an air inlet and an air outlet by using a respiratory sensor, and converting the detected respiratory airflow into an airflow electrical signal; the gas flow electric signal is subjected to signal conditioning through a signal conditioning circuit so as to remove signal noise interference and realize voltage following; the air flow electric signal output by the signal conditioning circuit is subjected to differential amplification through an A/D driving circuit; converting the airflow electrical signal output by the A/D driving circuit into an airflow digital signal through an A/D conversion circuit; reading the airflow digital signal from the A/D conversion circuit by using the singlechip and calculating respiratory airflow data of the patient; the method comprises the steps that the Bluetooth is controlled by a single chip microcomputer to send respiratory airflow data of a patient to a breath-holding monitoring app software interface of a wireless terminal for display; when the respiratory air flow of the patient is lower than a preset respiratory air warning threshold value, the breath-holding monitoring app software sends an alarm sound through a loudspeaker of the wireless terminal to prompt the patient to hold the breath again.
Compared with the prior art, the patient breath holding monitoring device and method applied to CT scanning can detect the breath holding condition of a patient in a CT detection state, doctors can guide the patient to hold the breath and inhale the breath correctly, and motion artifacts caused by abdominal breathing motion of the patient during breath holding and inhaling are prevented, so that CT scanning images obtained during CT lung scanning are clearer, and the quality of the CT scanning images is improved. In addition, the device of the invention is placed in the mouth of the patient through the breathing mouthpiece to directly monitor the breathing gas condition of the patient, and the breathing gas quantity of the fluctuating movement of the abdomen is more accurate than that of the breathing gas monitoring device placed in the lung abdomen when the breathing gas of the patient is monitored, so that the CT scanning image is clearer, and the CT diagnosis result is more accurate.
Drawings
Fig. 1 is a perspective view of a preferred embodiment of a patient breath-hold monitoring device for CT scanning according to the present invention.
Fig. 2 is an enlarged perspective view of the breathing mouthpiece of fig. 1.
Fig. 3 is a cross-sectional block diagram of a preferred embodiment of a patient breath-hold monitoring device for use in CT scanning according to the present invention.
Fig. 4 is a block diagram of the electrical circuitry of the breath-hold monitoring host of fig. 3.
Fig. 5 is a circuit layout diagram of the monitoring host circuit board of fig. 3.
FIG. 6 is a flowchart illustrating a method for monitoring breath-holding of a patient in a CT scan according to a preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of a patient breath-holding monitoring device applied to CT scanning according to the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the above objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and preferred embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a perspective view of a preferred embodiment of a patient breath-hold monitoring device for CT scanning according to the present invention; referring to fig. 1, the patient breath-holding monitoring device comprises a breathing mouthpiece 1 capable of being placed in the mouth, an air duct 2 and a breath-holding monitoring host 3, wherein the breathing mouthpiece 1 is connected with the breath-holding monitoring host 3 through the air duct 2 to form an integrated structure. Two ends of the air duct 2 are respectively provided with a connector, one connector of one end of the air duct 2 is communicated with the joint part 12 of the breathing mouthpiece 1, the connector of the other end of the air duct 2 is communicated with the main air passage 33 of the breath-holding monitoring host machine 3, and the main air passage 33 of the breath-holding monitoring host machine 3 is communicated with the air inlet and outlet 34. In addition, a power switch 36 is arranged on one side of the housing of the breath-holding monitoring host 3, and is used for controlling the on and off operations of the breath-holding monitoring host 3. In this embodiment, the breathing mouthpiece 1 is made of a medical plastic material, the breathing mouthpiece 1 is a device which can be put into the mouth of a patient for free breathing, and the breathing mouthpiece 1 is a disposable breathing mouthpiece, so that the infection caused by repeated use of the patient is avoided. The air duct 2 is a hollow medical plastic tube in an L shape, the shell of the breath-holding monitoring host 3 is made of environment-friendly PVC plastic materials, and the breath-holding monitoring host 3 is in a cuboid or cubic shape.
As shown in fig. 2, fig. 2 is an enlarged perspective view of the breathing mouthpiece 1 in fig. 1. In this embodiment, the breathing mouthpiece 1 includes a biting part 11 and a combining part 12, the biting part 11 is in a shape of a semicircular arc sheet, the bottom opening of the biting part 11 is communicated with the cylindrical combining part 12, and the joint of the two forms a sealing connection, so that the air leakage does not occur when a patient breathes. Two sides of the edge of the inner side of the opening of the biting part 11 are respectively provided with a biting sheet 13, the upper surface and the lower surface of each biting sheet 13 are respectively provided with anti-slip particles 14, and the arc outer side of each biting sheet 13 is provided with an anti-slip patch 15 for improving the tooth biting degree. The teeth of the patient can bite the bite piece 13, and the breathing mouthpiece 1 can be bitten by the teeth of the patient through the anti-slip particles 14 and the anti-slip patches 15 on the bite piece 13, so that the breathing mouthpiece 1 put into the mouth of the patient cannot fall off and fall off, and the stable effect of teeth biting can be improved.
Referring to fig. 3, fig. 3 is a cross-sectional view of a preferred embodiment of a breath-hold monitoring device for a patient in CT scan according to the present invention. In this embodiment, breath-holding monitoring host 3 includes shell 30, respiratory sensor 31 and host computer circuit board 32, place in shell 30 in respiratory sensor 31 and the host computer circuit board 32, shell 30 adopts the PVC plastic material of environmental protection to make. The housing 30 is opened with a main air passage 33 and an air inlet and outlet 34 of the respiration sensor 31, the main air passage 33 of the respiration sensor 31 is communicated with the air inlet and outlet 34 and is communicated with the outside air, so that the patient can breathe smoothly, and the respiration sensor 31 can measure the respiratory airflow passing through the main air passage 33. The respiration sensor 31 is a gas flow sensor with the model number of NK-FS6022, is specially designed for a portable respirator in a hospital, can be suitable for a baby respirator and an adult respirator, can sense the micro response flow and has extremely high accuracy of sensing the flow. The respiration sensor 31 is connected to the conductor slot of the host circuit board 32 through the conductive plug 35, so that the respiration sensor 31 can input the detected respiration airflow electrical signal to the single chip microcomputer 324 of the host circuit board 32 for processing.
In this embodiment, the breathing mouthpiece 1 is connected with the breath-holding monitoring host 3 through the airway tube 2 to form an integral structure. One end interface of the air duct 2 is seamlessly connected and communicated with the joint part 12 of the breathing mouthpiece 1, and the other end interface is seamlessly connected and communicated with the main air passage 33 of the breathing sensor 31. According to the invention, the two ends of the air duct 2 are provided with the interfaces, and are respectively screwed with the joint part 11 of the breathing mouthpiece 1 and the main air duct 33 of the breath-holding monitoring host 3 and communicated with each other, so that the connection among the breathing mouthpiece 1, the air duct 2 and the breath-holding monitoring host 3 is of a detachable structure, and the disposable breathing mouthpiece 1 or the air duct 2 can be conveniently replaced by a doctor when the disposable breathing mouthpiece 1 or the air duct 2 is used.
Referring to fig. 4 and 5, fig. 4 is a schematic block circuit diagram of breath hold monitoring host 3 of fig. 3; fig. 5 is a circuit layout diagram of the monitoring host circuit board 32 of fig. 3. In the present embodiment, the respiration sensor 31 is electrically connected to a host circuit board 32, and the host circuit board 32 includes, but is not limited to, a signal conditioning circuit 321, an a/D driving circuit 322, an a/D converting circuit 323, a single chip microcomputer 324, a bluetooth module 325, and an internal power source 326. The breath sensor 31, the signal conditioning circuit 321, the a/D driving circuit 322, the a/D conversion circuit 323, the single chip microcomputer 324 and the bluetooth module 325 are electrically connected in sequence, the breath sensor 31, the signal conditioning circuit 321, the a/D driving circuit 322, the a/D conversion circuit 323, the single chip microcomputer 324 and the bluetooth module 325 are all connected to a built-in power source 326, the built-in power source 326 can be a 5V small button lithium battery and is used for supplying power to the circuit elements, a power switch 36 is arranged on one side of the shell of the breath-holding monitoring host 3, and the power switch 36 is electrically connected to the built-in power source 326 and can be used for opening or closing the built-in power source 326, so that the opening and closing operations of the breath-holding monitoring host 3 are controlled.
The respiration sensor 31 is configured to convert the detected respiratory airflow into an analog airflow electrical signal, and output the airflow electrical signal to the signal conditioning circuit 321. In the prior art, the respiration sensor 31 adopted in this embodiment is a gas flow sensor available in the model NK-FS6022, and can directly convert the detected respiratory gas flow into an analog gas flow electrical signal, and the structural principle and the signal conversion principle of the respiration sensor NK-FS6022 are not described herein again.
The signal conditioning circuit 321 is configured to perform signal conditioning on the airflow electrical signal to remove signal noise interference and implement voltage following, and input the conditioned airflow electrical signal to the a/D driving circuit 322. The signal conditioning circuit 321 includes two proportional resistors R1 and R4, an operational amplifier of OPA4340, and a filter circuit (the specific circuit connection is shown in fig. 5) composed of a resistor R2 and a capacitor C4, and the input voltage of the voltage input terminal VCC is 5V. The signal conditioning circuit 321 can condition the airflow electrical signal to complete voltage following. The voltage is then passed through a low pass filter to filter out high frequency signals interfering with the electrical airflow signal output by the respiration sensor 31.
The A/D driving circuit 322 comprises an ADC driver with the model of ADA4941, six divider resistors R16-R20 and R22, a matching resistor R21 and three filter capacitors C13, C14 and C17, and the specific circuit connection is as shown in FIG. 5. The a/D driving circuit 322 is configured to receive the airflow electrical signal output by the signal conditioning circuit 321, perform signal differential amplification, and input the amplified airflow electrical signal to the a/D conversion circuit 323 for digital-to-analog conversion.
The A/D conversion circuit 323 comprises an A/D conversion chip with the model number of AD7691, a filter circuit consisting of two resistors R10 and R12 and two capacitors C10 and C11, three voltage dividing resistors R5, R6 and R8, three filter capacitors C5, C8 and C9, and impedance matching resistors R9, R11, R13 and R14, wherein the specific circuit connection is as shown in FIG. 5. The a/D conversion circuit 323 is used to convert the analog electric airflow signal into an digital airflow signal and transmit the digital airflow signal to the single chip microcomputer 324. In this embodiment, the a/D sampling rate of the a/D conversion circuit 323 is 1kHz, so a high-performance successive approximation type a/D conversion chip AD7691 is used in cooperation with the single-ended differential ADC driver ADA4941-1 to form a high-precision a/D converter.
The single chip microcomputer 324 is a single chip microcomputer with a model number of 89C2051, pins XTAL 1-XTAL 2 of the single chip microcomputer 324 are connected with an oscillation circuit formed by capacitors C6-C7 and a crystal oscillator Y1, a pin P1.0 is connected with a diode D2 and a resistor R7 which play a monitoring role in the running state in series, a pin VPP/Rst is connected with a voltage protection circuit formed by a diode D1, a resistor R3 and a capacitor C1 and connected with two filter capacitors C2-C3, and the specific circuit connection is as shown in FIG. 5. The single chip microcomputer 324 is used for reading the airflow digital signal from the A/D conversion circuit 323, calculating respiratory airflow data of a patient, and sending the respiratory airflow data of the patient to a wireless terminal (such as a mobile phone, a wireless notebook computer and the like) through a Bluetooth module 325 for display, wherein the Bluetooth module 325 is a Bluetooth module with the model number of nRF24L01, and can send the respiratory airflow data of the patient to a breath-holding monitoring app of the wireless terminal for display.
As shown IN fig. 5, the output terminal of the respiration sensor 31 is connected to the input terminal Vin1 of the signal conditioning circuit 321, the output terminal Vin2 of the signal conditioning circuit 321 is connected to the input terminal Vin2 of the a/D driving circuit 322, the output terminal IN + of the a/D driving circuit 322 is connected to the input terminal IN + of the a/D conversion circuit 323, the a/D conversion circuit 323 is connected to the input pins (four pins of P3.0/RxD, P3.1/TxD, P3.3 and P3.4, respectively) of the single chip microcomputer 324 through SPI buses (including four signal lines of SDI1, SCK1, SDO1 and CNV 1), and the output pins (seven pins of P1.0/RxD, P3.1/TxD, P3.3 and P3.4, respectively) of the single chip microcomputer 324 are connected to the input terminal of the bluetooth module 325 (seven pins of VCC, CSN, CE, MOSI, SCK, misq and IRQ, respectively). The power supply access terminals Vcc of the respiration sensor 31, the signal conditioning circuit 321, the a/D driving circuit 322, the a/D conversion circuit 323, the single chip microcomputer 324 and the bluetooth module 325 are all connected to the output terminal of the built-in power supply 326. In this embodiment, VCC is 5V, VIO is 3.3V, reference voltage VREF is 2.5V, SDI, SCK, SDO, CNV are all connected to the pins of the single chip microcomputer 89C2051, and the a/D conversion signal, i.e., the CNV signal, is obtained by the single chip microcomputer 89C2051 by using the IO port to generate frequency. On the CNV rising edge, the A/D conversion chip AD7691 samples the voltage difference between the IN + and IN-pins. The voltage swings on the two pins, IN + and IN-, are typically between 0V to VREF, IN opposite phases.
In this embodiment, the operational amplifier with the model number of OPA4340, the ADC driver with the model number of ADA4941, the a/D conversion chip with the model number of AD7691, the single chip with the model number of 89C2051, and the peripheral matching circuit (e.g., the voltage divider circuit, the filter circuit, the impedance matching circuit, and the oscillator circuit) respectively connected to the bluetooth module with the model number of nRF24L01 are connection circuits specified in the existing specification of the above-mentioned components and are therefore the prior art, and this embodiment is not described in detail.
In this embodiment, the airflow electrical signal output from the output terminal of the NK-FS6022 respiration sensor 31 is input to the operational amplifier OPA4340 via the input terminal Vin1 of the signal conditioning circuit 321 to perform signal conditioning and signal following. The operational amplifier OPA4340 inputs the input terminal IN + of the a/D driver circuit 322 for the airflow electrical signal to the ADC driver ADA4941 via the output terminal Vin2 of the signal conditioning circuit 321 for differential amplification, and then sends the amplified airflow electrical signal to the a/D converter circuit 323 (a/D converter chip AD 7691) for a/D conversion into an airflow digital signal. The A/D conversion chip AD7691 carries out data interaction with the singlechip 89C2051 in an SPI communication mode. The singlechip 89C2051 converts the voltage value of the read airflow digital signal into specific respiratory airflow data, simulates an SPI bus signal through an I/O port of the singlechip 89C2051, sends the respiratory airflow data to a wireless terminal (such as a mobile phone, a wireless notebook computer and the like) through an nRF24L01 Bluetooth chip, and displays the respiratory airflow data on a breath-holding monitoring app of the wireless terminal.
The invention also provides a patient breath holding monitoring method applied to CT scanning, which is applied to the patient breath holding monitoring device. Referring to fig. 6, fig. 6 is a flowchart illustrating a method for monitoring breath-holding of a patient according to a preferred embodiment of the present invention. The patient breath-hold monitoring method comprises the following steps: step S21, placing the breathing mouthpiece 1 in the mouth of a patient, and turning on a power switch of the breath-holding monitoring host machine 2; step S22, the Bluetooth of the wireless terminal is opened to be paired with the Bluetooth of the breath-holding monitoring host, and a breath warning threshold value is set on the breath-holding monitoring app software of the wireless terminal; step S23, detecting the respiratory airflow of the patient from the air inlet and outlet by the respiratory sensor 31, and converting the detected respiratory airflow into an airflow electrical signal; step S24, the signal conditioning circuit 321 conditions the airflow electrical signal to remove signal noise interference and implement voltage following; step S25, the a/D driving circuit 322 differentially amplifies the airflow electrical signal output by the signal conditioning circuit; a step S26 of converting the airflow volume electric signal output from the a/D drive circuit 322 into an airflow volume digital signal by the a/D conversion circuit 323; step S27, reading the airflow digital signal from the A/D conversion circuit 323 by using the singlechip and calculating the respiratory airflow data of the patient; step S28, the single chip microcomputer 324 sends the respiratory airflow data of the patient to a breath-holding monitoring app software interface of the wireless terminal for display through the Bluetooth module 325; step S29, when the respiratory airflow of the patient is lower than the preset respiratory airflow warning threshold, the breath-holding monitoring app software sends an alarm sound through a loudspeaker of the wireless terminal to prompt the patient to hold the breath again.
Referring to fig. 7, fig. 7 is a schematic view of the usage status of the patient breath-hold monitoring device of the present invention. The doctor guides the patient to lie down on the CT bed, and the doctor passes through air duct 2 with disposable breathing mouthpiece 1 and the seamless connection of interface of holding a breath monitoring host computer 3, lets the patient open mouth again and lets patient's tooth bite and hold portion 11 in breathing mouthpiece 1 places the mouth of patient, and patient's nose position is cliied to doctor's reuse clip, and the patient begins to breathe with the mouth this moment, and the breathing air flow is through holding a breath sensor 31 of gas monitoring host computer 3. The doctor turns on a power switch of the breath-holding monitoring host 3, takes out the wireless terminal (such as a mobile phone) provided with the breath-holding monitoring app, and turns on the mobile phone Bluetooth to complete pairing. The current patient incoming and outgoing air flow is displayed in the mobile phone app software, a doctor guides a patient to inhale air and then hold breath, the currently obtained inhaled air flow is set as a warning threshold value, then CT scanning equipment is started to start CT scanning on the patient, the breath sensor 31 continuously monitors the breath flow of the patient, and if the breath flow of the patient is lower than the set warning threshold value, the mobile phone app sends an alarm sound through a mobile phone loudspeaker to perform breath holding operation again.
The patient breath holding monitoring device and method applied to CT scanning can detect the breath holding condition of a patient in a CT scanning state, a doctor can guide the patient to hold the breath and inhale the breath correctly, and motion artifacts caused by abdominal breathing motion of the patient during breath holding and inhaling are prevented, so that CT scanning images obtained during CT lung scanning are clearer, and the quality of the CT scanning images is improved. The patient breath holding monitoring device is placed in the mouth of a patient through the breathing mouthpiece to directly monitor the breathing gas condition of the patient, and the breathing gas quantity of the fluctuating movement of the abdomen is more accurate than that of the breath holding monitoring device placed on the lung abdomen when the breathing gas of the patient is monitored, so that a CT scanning image is clearer, and a CT diagnosis result is more accurate.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent functions made by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a be applied to patient's breath-holding monitoring devices of CT scanning, its characterized in that, the device are including breathing the difficult mouth of a piece, air duct and breath-holding monitoring host computer, the breathing difficult mouth of a piece passes through the air duct and is connected structure as an organic whole with breath-holding monitoring host computer, wherein:
the breathing mouthpiece comprises a biting part and a combining part, and an opening at the bottom of the biting part is communicated with the cylindrical combining part;
the breath-holding monitoring host comprises a shell, a breathing sensor and a host circuit board, wherein the breathing sensor and the host circuit board are arranged in the shell, the breathing sensor is connected to a conductor groove of the host circuit board through a conductive plug, the shell is provided with a main air passage and an air inlet and outlet of the breathing sensor, and the main air passage and the air inlet and outlet of the breathing sensor are communicated;
the two ends of the air duct are respectively provided with a connector, one connector at one end of the air duct is communicated with the joint part of the breathing mouthpiece, and the connector at the other end of the air duct is communicated with the main air passage of the breathing sensor;
host computer circuit board includes signal conditioning circuit, AD drive circuit, AD converting circuit, singlechip and bluetooth module, wherein:
the respiration sensor is used for detecting the respiratory airflow of a patient from the air inlet and the air outlet, converting the detected respiratory airflow into an airflow electrical signal and outputting the airflow telecommunication to the signal conditioning circuit;
the signal conditioning circuit is used for performing signal conditioning on the airflow electrical signal to remove signal noise interference and realize voltage following, and outputting the conditioned airflow electrical signal to the A/D driving circuit;
the A/D driving circuit is used for differentially amplifying the airflow electrical signal output by the signal conditioning circuit and outputting the amplified airflow electrical signal to the A/D conversion circuit;
the A/D conversion circuit is used for converting the airflow electrical signal output by the A/D driving circuit into an airflow digital signal and transmitting the airflow digital signal to the singlechip;
the single chip microcomputer is used for reading the airflow digital signals from the A/D conversion circuit, calculating respiratory airflow data of a patient, and sending the respiratory airflow data of the patient to the wireless terminal through the Bluetooth module to be displayed.
2. The patient breath-hold monitoring device of claim 1, wherein a respective engaging piece is disposed on each of two sides of an inner edge of the opening of the engaging portion, the upper and lower surfaces of each engaging piece are provided with anti-slip particles, and the outer side of the arc of each engaging piece is provided with an anti-slip patch.
3. The patient breath-hold monitoring device of claim 1, wherein an output of the respiration sensor is connected to an input terminal Vin1 of a signal conditioning circuit, an output terminal Vin2 of the signal conditioning circuit is connected to an input terminal Vin2 of an a/D driving circuit, an output terminal IN + of the a/D driving circuit is connected to an input terminal IN + of an a/D converter, the a/D converter is connected to an input terminal pin of a single chip microcomputer through an SPI bus, and the output terminal pin of the single chip microcomputer is connected to an input terminal of a bluetooth module.
4. The patient breath-holding monitoring device of claim 1, wherein the host circuit board further comprises a built-in power supply, the power supply input terminals VCC of the respiration sensor, the signal conditioning circuit, the a/D driving circuit, the a/D converting circuit, the single chip microcomputer and the bluetooth module are all connected to the output terminal of the built-in power supply, and a power switch is disposed on one side of the housing of the breath-holding monitoring host and electrically connected to the built-in power supply.
5. The patient breath-hold monitoring device of claim 1, wherein said signal conditioning circuit comprises two proportional resistors R1 and R4, an operational amplifier model OPA4340, a filter circuit consisting of resistor R2 and capacitor C4.
6. A patient breath-hold monitoring device according to claim 1, wherein said a/D driver circuit comprises an ADC driver of the type ADA4941, six voltage dividing resistors R16-R20 and R22, a matching resistor R21 and three filter capacitors C13, C14 and C17.
7. A patient breath-hold monitoring device as claimed in claim 1, wherein said a/D conversion circuit comprises an a/D conversion chip of type AD7691, a filter circuit consisting of two resistors R10, R12 and two capacitors C10, C11, three voltage dividing resistors R5, R6, R8, three filter capacitors C5, C8, C9 and four impedance matching resistors R9, R11, R13, R14.
8. The patient breath-holding monitoring device of claim 1, wherein the single chip microcomputer is a type 89C2051 single chip microcomputer, pins XTAL 1-XTAL 2 of the single chip microcomputer are connected with an oscillating circuit consisting of capacitors C6-C7 and a crystal oscillator Y1, a pin P1.0 is connected with a diode D2 and a resistor R7 in series, a pin VPP/Rst is connected with a voltage protection circuit consisting of a diode D1, a resistor R3 and a capacitor C1, and two filter capacitors C2-C3 are connected.
9. The patient breath-hold monitoring device of claim 1, wherein the bite-holding portion is in the shape of a semicircular arc, the breath-hold monitoring host is in the shape of a cuboid or a cube, and the airway tube is an L-shaped hollow medical plastic tube.
10. A method of monitoring breath hold of a patient for use in a patient breath hold monitoring apparatus as claimed in any one of claims 1 to 9, the method comprising the steps of:
placing the breathing mouthpiece in the mouth of a patient, and starting a power switch of the breath-holding monitoring host;
the method comprises the steps that the Bluetooth of the wireless terminal is opened to be matched with the Bluetooth of the patient breath-holding monitoring device, and a breath warning threshold value is set on breath-holding monitoring app software of the wireless terminal;
detecting the respiratory airflow of a patient from an air inlet and an air outlet by using a respiratory sensor, and converting the detected respiratory airflow into an airflow electrical signal;
the gas flow electric signal is subjected to signal conditioning through a signal conditioning circuit so as to remove signal noise interference and realize voltage following;
the air flow electric signal output by the signal conditioning circuit is subjected to differential amplification through an A/D driving circuit;
converting the airflow electrical signal output by the A/D driving circuit into an airflow digital signal through an A/D conversion circuit;
reading the airflow digital signal from the A/D conversion circuit by using the singlechip and calculating respiratory airflow data of the patient;
the method comprises the steps that the Bluetooth is controlled by a single chip microcomputer to send respiratory airflow data of a patient to a breath-holding monitoring app software interface of a wireless terminal for display;
when the respiratory air flow of the patient is lower than a preset respiratory air warning threshold value, the breath-holding monitoring app software sends an alarm sound through a loudspeaker of the wireless terminal to prompt the patient to hold the breath again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911168548.6A CN111067557A (en) | 2019-11-25 | 2019-11-25 | Patient breath holding monitoring device and method applied to CT scanning |
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| CN201911168548.6A CN111067557A (en) | 2019-11-25 | 2019-11-25 | Patient breath holding monitoring device and method applied to CT scanning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021237546A1 (en) * | 2020-05-28 | 2021-12-02 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for patient monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021237546A1 (en) * | 2020-05-28 | 2021-12-02 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for patient monitoring |
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