AN206 Vishay Semiconductors, AN206 Datasheet

AN206

Manufacturer Part Number

AN206

Description

DG406 Multiplexer Optimizes Medical Simulator

Manufacturer

Vishay Semiconductors

Datasheet

1.AN206.pdf (3 pages)

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AN206

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AN206

Quantity:

5 510

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Introduction

A patient monitoring system collects information from several

transducers connected to a patient. The transducers convert

physiologic electromechanical activity into electrical signals

which are routed to a data acquisition module for digitization.

The digitized data is then processed and displayed on the

monitor screen. Additionally, bedside patient information can

be relayed to a central nursing station, a hospital information

system, or a doctor’s office.

Patient monitors must provide reliable data at all times. For this

reason, it is imperative to have an accurate means for

calibration and troubleshooting of patient monitoring

instrumentation. This function can be accomplished by using

a patient simulator which generates electrical signals similar to

those produced by the transducers.

For this application note, a patient simulator was designed and

built. The simulator consisted of a personal computer

peripheral device and had to be capable of producing the static

display of all numerics and graphics associated with the

following three human parameters: a) body temperature,

b) blood oxygen saturation level, c) heart pulse rate. Having

these capabilities greatly enhances the ability to perform fine

calibration and troubleshooting.

Document Number: 70604

10-Aug-99

Bedside Monitor

DG406 Multiplexer Optimizes Medical Simulator

From Patient

FIGURE 1. A Typical Medical Information System

Controller

Network

Performance Goals

The simulator design goals were as follows:

Theory of Operation

The commands to modify the simulated parameters are sent

from a PC over an RS-232 line to the peripheral device. A

microcontroller containing a UART receives these commands

as 8-bit frames and processes the data. After processing, the

microcontroller uses its I/O port bits to send data to the

parameter generation hardware. The parameter’s signal is

modified as specified by the down-loaded command. The

modified signals are then output to the patient monitor to

produce the appropriate visual displays.

Body temperature: from –1 C to 46 C in 0.1 C

increments, with an accuracy of

Blood oxygen saturation level: sixteen independent

values in the range of 60% to 100%.

Heart pulse rate: fifteen independent values in the range

of 30 to 300 pulses/min.

www.vishay.com FaxBack 408-970-5600

Central Nursing Station

Doctor’s Office PC

Vishay Siliconix

0.1 C.

AN206

6-1

Related parts for AN206

AN206 Summary of contents

Page 1

... The parameter’s signal is modified as specified by the down-loaded command. The modified signals are then output to the patient monitor to produce the appropriate visual displays. Central Nursing Station Network Controller Doctor’s Office PC www.vishay.com FaxBack 408-970-5600 AN206 Vishay Siliconix 0.1 C. 6-1 ...

Page 2

... AN206 Vishay Siliconix PC RS-232 Design Considerations The temperature parameter was simulated by using a discrete resistor array and a pair of analog multiplexers as illustrated in Figure 3. A discrete resistor value representing a known temperature was placed between the same channel of two analog multiplexers. Using its I/O lines, the microcontroller simultaneously selects one of the 16 resistors ...

Page 3

... Considerable time was spent shopping around for these three devices. Viewing from the better than expected results of the overall design obvious that the time spent in search of these devices was well worth it. AN206 Vishay Siliconix Programmable Counter Frequency Out to ...

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