Pulse Acquisition Requirements; Artifact Rejection Requirements; Parameter Determination Requirements; Major Hardware Components - Datascope Accutorr Plus Service Manual

CPU/NIBP Module Assembly with LCD Display
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Pulse Acquisition Requirements

Pulse amplitudes from 0.06 mmHg to 12 mmHg are recognized. Pulse rates can range
from 30 bpm to 250 bpm. The software discriminates pulses from the digitized pulse
channel signal, and characterizes the pulses for amplitude, DC pressure, and pulse period.
False triggering, due to the dicrotic notch or noise, is minimized.

Artifact Rejection Requirements

The software provides means of artifact rejection, both during acquisition and during
subsequent processing of the pulse array. Means of rejecting artifacts include attention to
the timing and amplitude of pulses relative to adjacent pulses. If motion artifact is detected
during acquisition, the software may cause temporary suspension of the bleed down
process until a quiescent patient condition returns.

Parameter determination Requirements

Pulses that are deemed acceptable after artifact processing are entered in the pulse array.
Heart rate is taken to be the average rate of the pulse array data. Pulse periods differing
excessively from the median are ignored. Pulses that do not appear to fit the amplitude
envelope are removed. The systolic, diastolic, and mean pressures are then calculated in
accordance with standard algorithms. A fair amount of data manipulation and computation
is required in the parameter determination. The results are reported no more than one
second from the termination of the pulse acquisition phase.

Major Hardware Components

CPU

A microcontroller (min. 16MHz) with three (3) serial communication controllers (SCC), a
serial communication port (SCP), programmable chip select lines (to minimize glue
logic), a IDMA controller, and parallel I/O ports for discrete signals.

Flash Memory

512K x 16 Flash ROM used for program storage and execution. A Flash ROM is used also
for downloading new revisions of software via the CPU's serial I/O lines (SCC).

Battery Backed Up Static RAM

512K x 16 static ram is used for data storage, trend information, etc. This memory is used
for data storage. Therefore, a battery back up is provided.

Nonvolatile RAM

Nonvolatile ram is used for configuration and serial number information. This memory
requires a battery back up.
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Theory of Operation
Accutorr Plus Service Manual