Bracco ACIST CVi CMS2000, User Manual, Page: 21 / 92

ACIST System Overview
P/N 900468-001 Rev. 02 ACIST Medical Systems, Inc. Section 1 System Overview 7
Injector Head Electronics
The Computer System
The electrical control system includes a digital computer that receives
input signals from the control panel and provides signals to display
data, alerts, status information, and operator prompts.
The computer system consists of two microprocessors. Major
functions such as the injection motor movement and saline pump
motor movement are monitored by both microprocessors. The
computer system controls the motion of the syringe plunger through a
motor drive circuit that includes a motor, a motor ampli
fi er, an optical
encoder, a potentiometer, and an A/D converter.
Injection Motor Control
The injection motor ampli fi er provides a drive signal to the motor in
response to a control voltage. Forward, reverse, and brake signals
come from the computer, and a speed feedback signal from an
optical encoder is used to control speed. The outputs of the optical
encoder and potentiometer are supplied to the computer through an
A/D converter as speed monitor and position monitor signals. These
allow the computers to check motor speed, motor direction, and
position (volume is a calculated value).
Saline Pump Control
The saline pump is driven under the control of the computers through
the pump motor and the motor driver. The computer supplies a drive
signal to the motor to operate the pump for saline
fl ush and KVO
operations.
The Control Panel
The control panel consists of the touchscreen, a standby button,
audible indicators, and an armed light. It also has connectors for
connection to the injector head and the hand controller. The control
panel can be mounted on the injector head or on a patient table (bed)
rail mount. The control panel has a swivel base, allowing it to be
easily rotated to a position for optimal viewing.
Standby Button
When you press the Standby button it immediately disables the
operation of the ACIST injection system. To re-enable the system you
press the Standby button again, then press OK on the screen. When
the Standby button is engaged the system will not inject contrast. This
is indicated by the NO INJECTION icon on the face of the button.
Armed Light
A green light illuminates when the system is ready to perform an
injection.
Injector Head Electronics