Direct your attention to device critical failures, as not all device failures are equal in importance.
Remember that approaches such as failure modes and effect analysis (FMEA), fault tree analysis (FTA), design review and parts review are useful to obtain immediate results.
Train your mind to be a cost-conscious reliability professional because management usually approves only those reliability-related decisions that are considered cost-effective.
Use simple and straightforward reliability methods and techniques. Seriously consider using methods such as FMEA and qualitative FTA. Remember that the responsibility of device reliability rests with the manufacturer during its design and maufacture, and in the field use, it is generally the responsibility of the user.
Past experience has shown that a simple failure reporting system is generally more beneficial in terms of improving medical(portable ultrasound machine) device reliability rather than having a large number of spares or standbys.