Duo™ Operating Instructions 0070-10-0603-01 2 - 7
Operation Routine Operation
If a measurement cannot be obtained, the Duo automatically reinflates the cuff to 30 – 60
mmHg higher than the initial inflation pressure, but will not exceed the maximum cuff
pressure listed in the “NIBP Sub-System Functional Requirements”, section 5.2.6. This process
will only repeat three times and then an associated error code will be displayed. Refer to
"Information Codes and Error Codes" on page 2-13 for further information.
NOTE: Pressing the Clear/Next Patient key while there are no
measurements in progress will reset the NIBP cuff inflation
pressure to the default value for the selected patient size.
1. Select a blood pressure cuff that is appropriate for the size of the patient. Measure the
circumference of the patient's limb for the best results.
NOTE: Using a correctly sized cuff, among other considerations,
has a direct bearing on the accuracy of the obtained NIBP
measurements. A cuff that is too narrow for the limb will
result in erroneously high readings. Selection of the cuff size
should be based on the circumference of the patient’s limb.
The design dimensions of the cuffs and their intended use
are based on recommendations made by the American
Heart Association.
CAUTION: Use only Mindray DS blood pressure cuffs and hoses with
the Duo.
2. Attach the NIBP cuff to the NIBP extension hose.
3. Attach the NIBP extension hose to the NIBP pneumatic fitting on the Duo.
4. Apply the cuff to the patient as shown in FIGURE 2-3. Ensure that the cuff is deflated and
lies directly against the patient's skin. The cuff should fit snugly. There should be no
clothing between the patient’s skin and the cuff.
CAUTION: The cuff must be properly applied to the patient's limb
before inflating. If it is inflated without being securely
wrapped, damage to the cuff can result.
FIGURE 2-3 Application of the Blood Pressure Cuff
5. Ensure that the appropriate patient size has been selected on the Duo.
6. Press the NIBP Start/Stop key to begin the NIBP measurement.
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