Medical Applications User Guide (pdf) - Freescale Semiconductor
Medical Applications User Guide (pdf) - Freescale Semiconductor
Medical Applications User Guide (pdf) - Freescale Semiconductor
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Diagnostic and Therapy Devices<br />
15.3<br />
Patient Height and Weight<br />
The patient’s height is taken by an ultrasonic<br />
sensor which measures the distance between<br />
the head and the sensor. An MCU takes the<br />
data produced by the transducer and uses an<br />
equation to calculate the distance between<br />
the sensor and the head, then calculates the<br />
difference between this distance and the total<br />
distance to the floor.<br />
The patient’s weight is taken by a pressure<br />
sensor. This operation is explained in the<br />
“Ventilation and Respiration” application<br />
article. In general, after signal conditioning<br />
produces a voltage, this voltage is passed<br />
through the ADC of a MCU to be processed<br />
and then passed by RS-232 or USB to the<br />
principal MPU. The general block diagram<br />
shows that the weight of the patient is passed<br />
through RS-232, although you can transmit<br />
by USB (optional). If RS-232 is used, it is<br />
necessary to add a MAX232 device according<br />
to the protocol (see Figure 15-4).<br />
15.4<br />
Patient Interface<br />
The patient has an interface to communicate<br />
with the admission machine. This interface is<br />
composed of a touch screen display, LEDs<br />
and a buzzer to warn if a decision must be<br />
made or if a process is finished. This module<br />
is developed with a secondary MCU, such as<br />
the <strong>Freescale</strong> S08QE.<br />
Figure 14-3: Portable Monitoring System<br />
Figure 15-3: Portable Monitoring System<br />
Figure 14-4: 15-4: Measuring Patient Height Height<br />
Anesthesia Unit Monitor<br />
Mass Flow Controller<br />
Halotane<br />
Height<br />
Ultrasonic<br />
Sensor<br />
Transmitter Receptor<br />
D=1/2Vt<br />
O<br />
Pressure<br />
2<br />
Sensor<br />
Figure 15-5: Configuration to Measure Patient Weight<br />
Figure 14-5: Configuration to Measure Patient Weight<br />
N O 2<br />
Infrared<br />
SPI/I<br />
Sensor<br />
MCU/MPU<br />
<strong>Freescale</strong> Pressure Sensors<br />
MPXx5004<br />
MPXx5004<br />
Optional Instrument<br />
Amplifier<br />
MPXC2011DT1<br />
MPXx12<br />
MPXx5010<br />
MPXx2010<br />
Spectometer<br />
Sensor<br />
MPXV 2053GVO<br />
MPXV5100<br />
ADC<br />
Display<br />
Keypad or<br />
Touch Screen<br />
2 SPI/I<br />
C<br />
2C <strong>Freescale</strong> Technology<br />
Optional<br />
Valve<br />
Controls<br />
Wireless<br />
Comm<br />
SCI<br />
Power<br />
Management<br />
MAX232<br />
80 <strong>Medical</strong> <strong>Applications</strong> <strong>User</strong> <strong>Guide</strong><br />
Alarm<br />
Signal<br />
Conditioning<br />
USB
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