Medical Applications User Guide (pdf) - Freescale Semiconductor

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Home Portable Medical 4.5 Obtaining Pressure Measurements The basic function of a blood pressure monitor is to measure arterial pressure. One method to obtain this measurement is to use a pressure sensor that measures the present pressure. The variations in pressure change the velocity of a motor that controls an air pump. The air chamber presses the arm up to the systolic pressure. When systolic pressure is reached, the valve can deflate the cuff around the arm gradually. At the same time, the pressure sensor takes the measurements. Some useful areas for Freescale sensors include the following health care monitoring applications: • Blood pressure (BP) monitors • Invasive BP monitors • Intrauterine BP monitors • Hospital bed controls • Respirators • Sleep apnea monitors • Sports diagnostic systems • Dialysis equipment • Drug delivery for inhalers • Physical therapy Freescale pressure sensors are specifically designed for applications where high quality and reliability are especially important. Freescale sensors offer a wide range of functions and features, from basic to fully amplified and temperature-compensated devices. The amplified series can easily be connected to an MCU. The low-voltage pressure sensor series is designed to meet power efficiency demands to extend longevity for simpler, costsensitive medical and portable electronics. Freescale pressure sensors combine advanced micro-machining techniques, thinfilm metallization and bipolar semiconductor processing that provides accurate and highly reliable sensors at competitive prices. Figure 4-4: Heartbeat Versus Diastolic Pressure Figure 4-4: Heartbeat Versus Diastolic Pressure 2500 2000 1500 1000 Figure 4-6: Freescale Pressure Sensors Figure 4-6: Freescale Pressure Sensors MPAK MPAK Axial Port Small Outline Package (SOP) 500 Case 482 Super Small Outline Package (SSOP) Case Tire 1317 Pressure Axial Basic Monitor Port Element Through Hole 492B 26 Medical Applications User Guide SBP MAP 0 1 458 915 1372 1829 2286 2743 3200 3657 4114 4571 5028 5485 5942 6399 6856 Vacuum Port Side Port DBP Dual Port Axial Port Unibody Medical Chip Pak Dual Port Through Hole Axial Port Gauge Port Through Hole Axial Port Heartbeat Pressure Figure 4-5: Flexis MCU Blood Pressure Monitor Reference Design Block Diagram Figure 4-5: Flexis Microcontroller Blood Pressure Monitor Reference Design Block Diagram Motor Control Air Chamber OLED Display Valve DC Motor (Air Pump) Power Stage USB Connector (Type B) Batteries SPI (3) GPIO (3) TPM (1) Power Stage MPXV5050GP (Pressure Sensor) High Pass Filter MC9S08JM60 USB MCU Power Supply (3.3, 12V) ADC (1) MCU MC9S08QE 128 SCI (2) ADC (1) TPM (1) SPI (4) Ctrl (2) GPIO (1) GPIO (39) I 2 C (2) MC13202 (ZigBee ® Transceiver) MPR083 (Capacitive Touch) Non-Volatile Memory Low Pass Filter (RC) Audio Amplifier Electrodes (5) Speaker Case 423A PCB Antenna Through Hole Axial Port
4.6 Blood Pressure Monitor Reference Design For more information on how to build a blood pressure monitor with the Flexis QE MCU family, download the following PDF documents from freescale.com: • Application note AN4328: Blood Pressure Monitor Fundamentals and Design. This application note describes the implementation of a basic blood pressure monitor using the MK53N512, MC9S08MM128 or MCF51MM256 medical oriented MCUs, pressure sensors, as well as the MED-BPM development board. Code is provided so development is faster. The block diagram is shown on Figure 4-8. • Application note AN3500: Blood Pressure Monitor Using Flexis QE128 and Pressure Sensors • Design reference manual DRM101: Blood Pressure Monitor Using the Flexis QE128 Family and Pressure Sensors Find more information about the components of a blood pressure sensor in this guide: • For Inertial Sensor, see Chapter 9, Hearing Aids Introduction. • For Wireless Communication, Power Management, Keypad and Speaker Implementation modules, see Chapter 3, Telehealth Systems Introduction. • For LCD screen connection, see Chapter 6, Blood Glucose Meter Introduction. • For Pressure Sensor implementation and Motor Control devices, see Chapter 12, Ventilation and Spirometry Introduction. Figure 4-7: Pressure Gauge Block Diagram Figure 4-8: Pressure Gauge Block Diagram Motor Control Air Chamber Home Portable Medical freescale .com/medical 27 Valve DC Motor (Air Pump) Power Stage Figure 4-8: MED-BPM Block Diagram Figure 4-9: MED-BPM Block Diagram GPIO GPIO Optocoupler Low-Pass Filter Buffer with Internal OpAmp Air Pump Air Value ADC High-Pass Filter TPM (1) Power Stage MPXV5050GP (Pressure Sensor) Arm Cuff High Pass Filter Pressure Sensor MP3V5050 ADC (1) ADC (1) Signal Amplifier with Internal OpAmp TPM (1) SPI (4) Ctrl (2) MCU MC9S08QE 128 Low-Pass Filter Freescale Technology MM/KSX Internal Non Electrical Connection ADC
Page 1 and 2: Medical Applications User Guide TM
Page 3 and 4: freescale.com/medical 3 Introductio
Page 5 and 6: Introduction 1.1 Freescale Offers T
Page 7 and 8: Monebo Kenetic ECG Algorithms Free
Page 9 and 10: Home Portable Medical 2.1 Introduct
Page 11 and 12: 3.2 Home Health Hub (HHH) Reference
Page 13 and 14: 3.3 Power Management Every design n
Page 15 and 16: MC34704 The MC34704 is a multi-chan
Page 17 and 18: 3.7 How it Works The external capac
Page 19 and 20: eliably monitor and manage non-crit
Page 21 and 22: 3.19 Standard Medical USB Communica
Page 23 and 24: Freescale has developed sample code
Page 25: 4.2 Heartbeat Detection The heartbe
Page 29 and 30: MCF51MM: Flexis 32-bit ColdFire V1
Page 31 and 32: Heart Rate Monitor 5.1 Introduction
Page 33 and 34: Instrumentation amplifier requireme
Page 35 and 36: 6.2 Test Strip A test strip consist
Page 37 and 38: fully featured products at lower co
Page 39 and 40: Freescale’s Xtrinsic acceleromete
Page 41 and 42: 7.2 Signal Acquisition This applica
Page 43 and 44: AN4327 Pulse Oximeter Fundamentals
Page 45 and 46: 8.2 Electrocardiography (ECG) Acqui
Page 47 and 48: Xtrinsic Touch-Sensing Software Xtr
Page 49 and 50: • Internal voltage reference •
Page 51 and 52: 9.2 Microphone Amplifier The microp
Page 53 and 54: 9.5 Digital Signal Processor The di
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Page 57 and 58: 10.4 Filtering ECG The ECG has thre
Page 59 and 60: Features: • ColdFire V1 core deli
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Page 67 and 68: • i.MX Processors The most versat
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Page 71 and 72: S08MM: Flexis 8-bit MCUs The 9S08MM
Page 73 and 74: 13.2 Brief Theory As mentioned in C
Page 75 and 76: Vital Signs 14.1 Introduction A vit
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14.6 Motor Control with Freescale D
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State-of-the-art technology—inclu
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15.5 Communication Interfaces USB P
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15.7 Multimedia Applications with i
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16.2 Ultrasonic Probe The ultrasoni
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segments. Devices start from 128 KB
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Powered Patient Bed 17.1 Introducti
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accelerometer is required. The Free
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Table 17-1. Freescale Technologies
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18.2 Ultrasound Ultrasound is a non
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The depth in color used in the fina
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significant amount of precision ana
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All the devices featured are pin co
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Summary Summary Applications Freesc
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Appendix Digital Signal Processing
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Freescale Technologies • ColdFire
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ADC Analog-to-digital converters (A
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freescale .com/medical
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Medical Applications User Guide (pdf) - Freescale Semiconductor

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