Important Information
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2016-2017 SR Research Ltd.
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more than one power source to the USB cable could damage the Host PC or the
USB cable.
The EyeLink Portable Duo is intended to be powered by two USB 3.0 ports on
the Host PC. Desktop and laptop computers are typically certified to IEC 60950
or equivalent, which provides electrical protection for the operator. However
only IEC 60601-1 power sources or computers meet the level of safety required
for patient contact in medical environments. The eye tracker safely isolates the
participant from all connections to the Host PC through its enclosure (and its
USB cable jacket), so IEC 60950 certified computers may be used to power it.
However, the participant is still at risk to indirect contact with the computer
and its peripherals, for example by contact with the operator. See section 6.1.3
for rules to prevent this.
6.1.2 Disconnection
Should disconnection of the EyeLink Portable Duo eye tracker be required for
safety (for example, during maintenance or a fault in the eye tracker, the Host
PC, or other networks or devices connected to the Host PC), the eye tracker may
be rendered safe by unplugging both USB connectors from the Host PC. This
ensures complete isolation from all ports of the Host PC, including network and
power.
If accidental reconnection could cause a hazard (e.g., if someone who is not
aware of the issue reconnects the USB connectors to the power source), it is
recommended that the connector end of the USB cable be coiled up, marked
with a tag, or placed in a plastic bag to prevent reconnection by unauthorized
persons.
6.1.3 Maintaining Participant Isolation
WARNING:
The operator should avoid simultaneously contacting the
participant and the computer, or any device connected with cables to the Host
PC, such as a keyboard or mouse, that were not included with the system and
clearly identified as suitable for contact with the participant.
It is the responsibility of those involved with the patient’s case, and the
responsible organization (e.g. hospital) to decide if a participant is allowed to be
exposed to the same levels of risk of electrical shock as the operator of the eye
tracker and other IT equipment. For this reason, the rules below should be
followed by operators and maintenance personnel to ensure that participants
remain safely isolated from the Host PC and its peripherals:
1)
Keep all devices connected by cables to the Host PC (including mouse
and keyboard), and the computer itself, out of the participant accessible
area (defined to be within arm’s reach [120cm] of the participant. This
includes participant response devices unless a USB isolator is used, the
device is wireless, or the device is certified to EN 60601-1.
