Where to buy multi-parameter monitor in Guangdong

Telephone cell phone
Model
Type multi-parameter bedside monitor
Large screen, true color LCD high-definition display, Chinese and English interface
Real-time display of ECG and blood oxygen It has three waveforms: saturation and respiration, and displays heart rate/pulse, body temperature, respiration, blood oxygen saturation, blood pressure and other values on the same screen. The end-respiratory monitoring function is optional
Blood pressure measurement is divided into manual, Periodic and fast measurement
It has various display methods such as standard interface, large character interface, multi-trend coexistence interface, oxygenation respiration graph interface, etc.
The color of the waveform interface can be set as needed
It has screen freezing , Setting storage function
With data trend and ECG waveform playback function for more than one hour
Can store blood pressure, heart rate, body temperature, blood oxygen saturation, respiration and other trend data during group pressure measurement
Can Optional built-in recorder to record a variety of waveforms and events
Has three-level alarm settings and alarm upper and lower limit adjustment functions
Anti-defibrillation, anti-high-frequency electrosurgical, can be used simultaneously with a pacemaker
br/> On-board power supply system, AC and DC, working time can reach more than minutes when power is off
Measurement principle and measurement performance of multi-parameter monitor
[Abstract] This article introduces the main features of multi-parameter monitor Components and measurement principles, as well as measurement performance requirements for the most commonly used parameters of ECG, respiration, non-invasive blood pressure, pulse, and blood oxygen saturation.
[Keywords] ECG, blood pressure, blood oxygen saturation, respiration
A multi-parameter monitor is a device that can continuously measure and control patient physiological parameters for a long time, and has storage, display, analysis and control functions. , and a device or system that issues an alarm for parameters that exceed the set range.
The application purpose of multi-parameter monitors is to provide medical staff with vital sign information of monitored patients in clinical settings, and to assist medical staff in diagnosis and treatment.
Basic structure
The multi-parameter monitor is mainly composed of four parts: signal acquisition, analog processing of signals, digital processing of signals, display, recording and alarm part, which picks up the human body's ECG, blood pressure, etc. through electrodes and sensors.< br/>Physiological parameter signals such as respiration and blood oxygen saturation. The collected signals are amplified through analog circuits, while noise and interference signals are reduced to improve the signal-to-noise ratio, and useful signals are sampled, modulated, demodulated, and impedance matched. The analog signals of human physiological parameters are converted into digital signals by the analog-to-digital converter and sent to the digital processing part. This part is a very critical part of the monitoring system and consists of analog-to-digital converters, microprocessors, memories, etc. Composed to perform calculation, analysis, and diagnosis on signals. The display, recording and alarming part of the signal is the part where the monitor communicates information with people. The screen displays the curves of various monitored parameters changing with time for doctors to analyze, while the recorder records the monitoring parameters as files. Save, and when the measured parameter exceeds a certain standard value, an alarm will be issued to prompt medical personnel to perform rescue operations in a timely manner.
Measurement principle
The signals monitored by multi-parameter monitors are usually ECG, non-invasive blood pressure and invasive blood pressure, blood oxygen saturation, respiratory and end-tidal carbon dioxide partial pressure,
body temperature , cardiac output, etc. According to clinical needs, different monitors have different emphases and have different configurations.
ECG monitoring
ECG is the most commonly used monitoring item. The electrochemical activity of excitable cells in the myocardium causes electrical excitement in the myocardium. Cause mechanical contraction of the heart. The closing and action current generated by this exciting process of the heart flows in the volume conductor of the human body and spreads to various parts of the body, causing current difference changes in different surface parts of the human body. Electrocardiogram records the changing potential difference on the body surface in real time. Multi-parameter monitors can generally monitor one or more leads, and can display the waveform of one or two leads at the same time and extract it through waveform analysis. Heart rate parameters can be obtained. A powerful monitor can monitor the leads. Through monitoring,
abnormal heart rhythms and various heart rhythm disorders can be found, such as premature atrial and ventricular contractions, myocardial blood supply, electrolyte disorders, etc.
Non-invasive blood pressure monitoring
Blood pressure refers to the pressure of blood on the blood vessel wall. During each contraction and relaxation of the heart, the pressure of the blood flow on the blood vessel wall also changes. Clinically, it is usually corresponded to the arterial blood vessels at the same height of the human upper arm and the heart
The systole and diastole phases of the heart The pressure values used to represent the blood pressure of the human body are called systolic blood pressure (or high pressure) and diastolic blood pressure (or low pressure) respectively. Blood pressure measurement methods include direct measurement and indirect measurement. The indirect measurement method is a non-invasive blood pressure measurement, often called non-invasive blood pressure. Measurement methods include auscultation, oscillation (also called oscillometric method), and ultrasonic Doppler, which can measure systolic blood pressure, diastolic blood pressure, and mean blood pressure. The multi-parameter monitor uses the vibration method
to measure non-invasive blood pressure. When the monitor automatically inflates the cuff to a certain pressure (usually ~ ), it completely compresses the arterial blood vessels and blocks the arterial blood flow. After starting to deflate, The cuff pressure gradually decreases,
The pulsation of the arterial blood flow on the arterial vessel wall will produce an oscillation wave in the gas within the cuff, which can be obtained by measuring, recording and analyzing the pressure oscillation wave of the cuff during the deflation process. Systolic blood pressure, diastolic blood pressure and mean blood pressure at the measured site.
Blood oxygen saturation monitoring
Oxygen is an indispensable substance in life activities. The available oxygen molecules in the blood are transported to various tissues throughout the body by combining with hemoglobin to form oxyhemoglobin. The parameter used to characterize the ratio of oxygenated hemoglobin to blood is called oxygen saturation. Pulse oximetry is based on Lambert-Beer's law (photoelectric technology is used to measure blood oxygen saturation. According to the different light absorption characteristics of hemoglobin and oxygenated hemoglobin in the blood, by using two different wavelengths of red After light and infrared light pass through the tissue respectively, they are converted into electrical signals by the photoelectric receiver. At the same time, the absorption signals of other components in the tissue, such as skin, bones, muscles, venous blood, etc. are also used. Constant, but only the absorption signals in the arteries and pulses change periodically with the pulse, which is obtained by processing the received signals.
Respiratory monitoring
Respiratory monitoring It monitors the patient's respiratory rate, which is the number of breaths per unit time. There are generally three measurement methods: impedance method, direct measurement of respiratory airflow method (thermal respiration measurement) and airway pressure method. Among multi-parameter monitors
Respiration measurements mostly use the thoracic impedance method. During the human body's breathing process, the thoracic muscles alternately relax and deform, and the electrical impedance of the body tissue also changes alternately. The movement of the thoracic cage during the human body's breathing process will cause changes in the body's body resistance.
Change, the amount of change is ~, which is called respiratory impedance. The monitor generally injects a safe current into the human body with a sinusoidal constant current of carrier frequency through two electrodes of the lead, thereby picking up on the same electrodes. Respiration
Signal of changes in respiratory impedance. This change diagram of respiratory impedance describes the dynamic waveform of respiration, and the respiratory rate parameters can be extracted.
Body temperature monitoring
Body temperature measurement in the monitor Generally, a thermistor with a negative temperature coefficient is used as a temperature sensor. Generally, monitors provide one body temperature, and high-end instruments can provide two channels of body temperature. The types of body temperature probes are also divided into body surface probes and body cavity probes
They are used to monitor body surface and intracavity body temperature respectively. During measurement, the operator can place the temperature probe on any part of the patient's body as needed. Since different parts of the human body have different temperatures, the temperature value measured by the monitor at this time is
It is the temperature value of the part where the probe is placed on the patient's body. This temperature may be different from the temperature value of the mouth or armpit.
Invasive blood pressure monitoring
During some serious surgeries, blood pressure can be measured in real time. The monitoring of changes has very important clinical value. In this case, invasive blood pressure monitoring technology needs to be used. The principle is to first puncture the catheter and implant it into the blood vessel of the measured site, and the external port of the catheter is directly Connect to the pressure sensor and inject physiological saline into the catheter. Since the fluid has a pressure transmission effect, the intravascular pressure will be transmitted to the external pressure sensor through the liquid in the catheter. Thus, the dynamics of intravascular pressure changes can be obtained
State waveform, through specific calculation methods, systolic blood pressure, diastolic blood pressure and mean blood pressure can be obtained. Measurement performance requirements
Commonly used monitoring parameters of multi-parameter monitors mainly include ECG, respiration, body temperature, non-invasive blood pressure, and pulse oximetry. Monitoring parameters for degree and invasive pressure expansion include cardiac output, carbon dioxide, anesthetic gas, and oxygen. According to (Fujian)
"Multiple Parameter Monitor" calibration procedures, the measurement performance of ECG, respiration, non-invasive blood pressure, and pulse oximetry, which are commonly used in general hospitals, are introduced as follows
ECG Monitoring< br/> ) Maximum allowable error in voltage measurement. ) The voltage measurement deviation caused by polarization voltage does not exceed. ) The noise level should be no greater than (peak-to-peak). ) Maximum allowable error of scanning speed. ) The input loop current should not be greater than. )
The amplitude-frequency characteristics take the sine wave as the reference value. Within (~), the maximum allowable deviation of the amplitude + to. For monitors with diagnostic functions, within (~), the maximum allowable deviation of the amplitude + to. ) The common mode rejection ratio should be no greater than. )
When the heart rate is within the range of (~) beats/min, the maximum allowable error (+ characters of the displayed value) should be no greater than the heart rate alarm occurrence time. The preset lower limit of the heart rate alarm is beats/min, and the upper limit is beats/min. Maximum allowable error (+ characters of the displayed value).
Non-invasive blood pressure monitoring
) Static pressure measurement range (~maximum allowable indication value for first calibration, maximum allowable indication value for subsequent calibration and in-use inspection, indication value Repeatability is not greater than The maximum allowable value is times/min.
Respiratory monitoring
The respiratory frequency is within the range of (~) times/min, and the maximum allowable value is times/min.
Conclusion
National Metrology Verification Regulations Calibration procedures have been formulated for the ECG and non-invasive blood pressure parameters of multi-parameter monitors. Some provincial metrology verification agencies have also formulated local calibration procedures for commonly used monitoring parameters ECG, respiration, non-invasive blood pressure, and pulse oximetry.
At present, there are no testing standards for parameters such as invasive pressure, cardiac output, carbon dioxide, and anesthetic gases. It is recommended that relevant departments establish standards as soon as possible, improve measurement equipment, formulate calibration procedures, and accurately evaluate the performance of various monitoring parameters of multi-parameter monitors. Carry out verification.
Ensure the effectiveness and safety of clinical use. It is of great significance to reduce clinical risks.