ZHCU623 January   2019

 

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2.4.3 Wearer Comfort

This design used a 2-layer flex PCB to reduce thermal mass and maximize board flexibility. The primary benefit of flexibility is the ease and comfort for the wearers, which improves the likelihood that the patch will remain static on the patient. Regions such as the RF portion that require solid ground planes should be kept as small as possible to minimize the portion of the board that feels rigid to the wearer. Wearer comfort can not be quantified, so it important to consider this factor in the design of any final products. It may be desirable to enclose a final system in soft-gauze or various types of bandages to pad between the board and the wearer. If this is done, take care to ensure that the thermal path between the TMP117 and the wearer's skin is still optimized for response time and accuracy. The final product must also be characterized with the expected packaging included. The recommendations listed in the Layout considerations for wearable temperature sensing (SNOAA03) and Design challenges of wireless patient temperature monitors (SNOAA07) application reports may help the designer improve system response time and accuracy.