Skip to main content

CENTRAL MONITOR

  •  Central Monitor


  • With central monitoring, the measured physiological parameters of patient are displayed and recorded at a central station. It shows physiological parameters of all the patients at one location usually nursing station and thus assists the nursing staff.
  • Usually, the signal conditioners are mounted at the bedside and the display & alarms, etc. are located in a central station.
  • The central station monitoring equipment may use a multi-microprocessor architecture to display a smooth waveforms, alphanumerics and graphics on a single display.
  •  It generates audible and visual alarms if preset vital sign limits are exceeded.
  • It displays the patient’s vital signdata. By watching this data, the nursing staff can detect problems before they reach the alarm stage.
  • It provides a recordingof the ECG and sometimes of other parameters.
  •  The information for thecentral monitor is collected from the bedside. Each bedside cable contains as many as fifteen analog signals representing physiological parameters, which may include blood pressures, ECG, heart rate, respiration rate, pulse rate, SpO2, end-tidal CO2 and body temperature.
  • Physiological values arethen sampled and digitized at appropriate rates by a 10-bit analog-to-digital converter. ECG waveforms are sampled every two milliseconds to maintain the 0–100 Hz bandwidth. Slowly varying variables such as temperature are sampled every four seconds.
  •  The trend memory can hold patient data for 24h. It contains 6K words of CMOS RAM.

Labels:

Comments

Post a Comment

Popular posts from this blog

MICROPROCESSOR BASED VENTILATOR

Microprocessor based Ventilator   Figure shows the block diagram of microprocessor controlled ventilator.(given below). It consists of two inter-connected systems: The Pneumatic flow system and an Electronic control system. The pneumatic flow system enables the flow of gas through the ventilator. Oxygen and medical grade air enter the ventilator at 3.5 bar (50 psi) pressure. These gasses enter the air/oxygen mixer where they combine and gasses then enter a large reservoir tank. An electronically controlled flow valve proportions the gas flow from the reservoir tank to the patient breathing circuit.   As the gasses leave the ventilator, they pass by an oxygen analyzer, a safety ambient air inlet valve and a back-up mechanical over pressure valve. The microprocessor controls each valve to deliver the desired inspiratory air and oxygen flows for mandatory and spontaneous ventilation. The electronic control system may use one or...
Post a Comment
Read more

Anasthesia machine and it's block diagram.

Anaesthesia Machine: An anaesthesia machine is a device which is used to deliver variable gas mixture of anaesthetic gas and air/oxygen gases to the patient’s respiratory system.   Need Of Anaesthesia Machine: Surgical Operations normally carried out under some form of Anaesthesia. The functions of anaesthesia are:         1)      It ensures that the patient does not feel pain and minimizes patient discomfort.         2)      It provides the surgeon with favourable conditions for the work. Examples: Diethyl ether, Chloroform, Halothane, cyclopropane and Nitrous oxide. ·        Anaesthesia Machine block diagram:     Anaesthesia machine is consists of two subsystems : (i)         Gas supply system: Gases are provided to the anaesthesia machine...
Post a Comment
Read more

DC defibrillator principle & defibrillator.

                          DC DEFIBRILLATOR:   In almost all present-day DC defibrillators, an energy storage capacitor is charged at a relatively slow rate (seconds) from the AC line by means of a step-up transformer and rectifier arrangement or from a battery and a DC to DC converter arrangement the energy stored in the capacitor is then delivered at relatively rapid rate (millisecond) to the chest of the patient.             The basic circuit diagram of a DC defibrillator is shown in Figure. A variable auto-transformer T1 forms the primary of a high voltage transformer T2. The output voltage of the transformer is rectified by a diode rectifier and is connected to a vacuum type high voltage change-over switch. In position A, the switch is connected to on...
Post a Comment
Read more