RESUMEN
This study aimed to validate the accuracy of the test device (TMB-2296-BT) blood pressure (BP) monitor in adults according to International Standard Organization (ISO) 81060-2:2018 + Amd.1:2020 universal standard protocol, which is a digital monitor. Three trained observers used the same arm sequential method to compare the SBPs and DBPs measured by the test device with those measured by the reference device (mercury sphygmomanometer). For the test device with cuff ranging from 22 to 32 cm, there are 88 adults, with a male-to-female ratio of 35 : 53. The mean difference and SD between reference BPs and test device BPs readings were (0.21 ± 2.59)/(0.66 ± 2.12) mmHg for SBP/DBP for criterion 1, and (0.21 ± 2.07)/(0.66 ± 1.76) mmHg for SBP/DBP for criterion 2. For the test device with cuffs ranging from 22 to 42 cm, there are 87 adults, with a male-to-female ratio of 49 : 38. The mean difference and SD between reference BPs and test device BPs readings were (-1.62 ± 2.80)/(0.12 ± 3.01) mmHg for SBP/DBP for criterion 1, and (-1.62 ± 2.35)/(0.12 ± 2.60) mmHg for SBP/ DBP for criterion 2. And for the test device with cuff arm circumference sizes of 22-32 cm and 22-42 cm fulfilled both validation criterion 1 and 2 of the ISO 81060-2:2018 + Amd.1:2020 standard and can be recommended for both clinical and self/home BP measurement in adults.
RESUMEN
The objective of this study is to evaluate the accuracy of the wrist blood pressure (BP) monitor (TMB-2285-BT) in general population according to international standard of ISO 81060-2:2018+Amd.1:2020. The TMB-2285-BT BP monitor is an oscillometric device measuring BP from wrist. A single cuff for wrist sizes of 13.5-21.5â cm was used for the test device. The study was performed according to the 'International Standard (ISO 81060-2:2018 + Amd.1:2020) protocol' using the same-arm sequential BP measurement method. Subjects (n ≥ 85) fulfilling the age, gender, BP, and cuff distribution criteria of the protocol were enrolled. For criterion 1, the mean difference of SBP and DBP between the test device and the reference device was -0.27 mmHg and -0.80 mmHg, respectively. For criterion 2, the SD of the averaged paired determinations of SBP and DBP for the test device and the reference device was 2.60 and 2.06 mmHg, respectively, both of which were less than 6.95 and 6.89 mmHg. The accuracy of the test device fulfilled the requirements of the criterion 1 and 2 of ISO 81060-2:2018 + Amd.1:2020. The TMB-2285-BT wrist BP monitor can be recommended for home BP measurement for general population.
RESUMEN
Gas sensing performance characterization systems are essential for the research and development of gas sensing materials and devices. Although existing systems are almost completely automatically operated, the accuracies of gas concentration control and of pressure control and the ability to simultaneously detect different sensor signals still require improvement. In this study, a high-precision gas sensing material characterization system is developed based on vacuum technology, with the objective of enabling the precise and simultaneous measurement of electrical responses. Because of the implementation of vacuum technology, the gas concentration control accuracy is improved more than 1600 times, whereas the pressure of the test ambient condition can be precisely adjusted between vacuum and 1.2 bar. The vacuum-assisted gas-exchanging mechanism also enables the sensor response time to be determined more accurately. The system is capable of performing sensitivity, selectivity, and stability tests and can control the ambient relative humidity in a precise manner. More importantly, the levels of performance of three different optical signal measurement set-ups were investigated and compared in terms of detection range, linearity, noise, and response time, based on which of their scopes of application were proposed. Finally, single-period and cyclical tests were performed to examine the ability of the system to detect optical and electrical responses simultaneously, both at a single wavelength and in a spectral region.
