Hitachi L44 Instruction Manual page 13

4) Using a sterile probe cover to protect the probe is recommended.
The probe cover should be allergy free material to avoid allergic
reaction. Between the probe and the probe cover, acoustic coupling
gel is required as a couplant.
5) Place the probe on the examination site and adjust the probe's
position for a clear view of the desired image.
6) After using the probe and the elasto coupler perform the
reprocessing procedure in accordance with the procedure stated
in "5. Reprocessing procedure" every time immediately after
completing the ultrasound examination.
7) Store the probe and the elasto coupler in the environment
indicated in "6. Maintenance and Safety Inspection".
( 7 ) Q1E-EP1370