Medical Applications User Guide (pdf) - Freescale Semiconductor

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Anesthesia Monitor 13.1 Introduction An anesthesia monitor is a machine that administers anesthesia to patients by one of two ways: intravenous or inhaled gas anesthesia. It exchanges respiratory gases and administers anesthetic gases, maintaining a balance of gases through the respiratory and cardiovascular system. 72 Medical Applications User Guide
13.2 Brief Theory As mentioned in Chapter 12, Ventilation and Spirometry, the hospital pipeline is the primary gas source at 50 PSI. This is the normal working pressure of gas machines. Oxygen is supplied at approximately 2000 PSI. Anesthesia flow is composed of different sections. The first is the gas supply and substance-delivery (Halotane, O2, and N2O) system. In this part the O2 and the N2O are mixed in the desired proportion. The mass flow controller indicates the amount of anesthetic substance delivered to the patient. The MCU controls the electromechanical valve that adjusts the flow rate and the volume of the gases (Halotane, O2, and N2O). 13.3 Pressure Sensor This sensor helps the principal MCU take the pressure of the O2 and N2O. This measurement and the concentration of the substance are the variables that control the valves. To see the configuration of the pressure sensor and the Freescale portfolio, see Chapter 12, Ventilation and Spirometry. 13.4 Valve Control Using a sensor, the MCU takes the concentration of the substances in the blood. With these parameters, the MCU knows how much drug/air/oxygen needs to be delivered to the patient and the required power to apply to the valves. 13.5 Principal MCU The remainder of the process occurs in the vaporizer (there is a special apparatus to make this). Here, Halotane, O2 and N2O are mixed. These substances need to be vaporized so that the patient can breathe them and receive the necessary anesthesia. Therefore the principal MCU has to control the rate by adjusting the valves, depending on the pressure of the substances and their concentrations in the patient. Figure Anesthesia 12-1: 13-1: Anesthesia Unit Anesthesia MonitorUnit Unit Monitor Monitor Mass Flow Controller Mass Flow Controller Halotane Halotane O 2 O 2 N 2 O N 2 O Pressure Sensor Pressure Sensor Infrared Infrared Sensor Sensor Spectometer Sensor Finally, the patient breathes the anesthesia mixed through the mass flow controller. The Freescale Kinetis and the PXS20 MCUs are recommended for this application. Kinetis K60 MCUs The Kinetis K60 MCU family includes 512KB-1MB of flash memory, a single precision floating point unit, IEEE 1588 Ethernet, full- and high-speed USB 2.0 On-The-Go with device charge detect, Valve Valves Controls Display Display MCU/MPU Diagnostic and Therapy Devices Freescale Technology Optional MCU Optional Peripherals Analog Sensors Freescale Technology Optional USB Wireless Comm Wireless Comm Power Management Power Management hardware encryption, tamper detection capabilities and a NAND flash controller. 256-pin devices include a DRAM controller for system expansion. The Kinetis K60 family is available in 144 LQFP, 144 MAPBGA, and 256 pin MAPBGA packages. freescale .com/medical 73 Alarm Alarm Signal Conditioning Signal Conditioning MCU/MPU Keypad or Touch Screen Keyboard SPI/I 2 C SPI/I 2 C SPI/I 2 C Anesthesia Unit Monitor Figure 13-2: Anesthesia Application General Overview Figure 12-2: Anesthesia Application General Overview Mass Flow Controller Valve Controls Halotane O 2 N 2 O Pressure Sensor Infrared Sensor Spectometer Sensor Infrared Sensor Spectometer Sensor Display MCU/MPU MCU/MPU Alarm Signal Conditioning Halotane Keypad or Touch Screen SPI/I 2 C SPI/I 2 C SPI/I2 Valves Controls C MC9S08QG4 O 2 Mass Flow Controller USB N 2 O USB Wireless Comm Power Management
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Medical Applications User Guide TM
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freescale.com/medical 3 Introductio
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Introduction 1.1 Freescale Offers T
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Monebo Kenetic ECG Algorithms Free
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Home Portable Medical 2.1 Introduct
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3.2 Home Health Hub (HHH) Reference
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3.3 Power Management Every design n
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MC34704 The MC34704 is a multi-chan
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3.7 How it Works The external capac
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eliably monitor and manage non-crit
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