We present ultrathin, flexible and stretchable epidermal health monitoring devices that contain physiological sensors, an analog front end processor, a core microprocessor, flash memory module, ...rechargeable battery, and a wireless communication (Bluetooth low energy) module. The system is mechanically matched to the Young's modulus of human skin and designed to record heart rate, electromyography signals, activity, respiration and sleep quality to facilitate continuous (electro-)physiological data recording outside of the hospital setting.
In this investigation, the "archipelago" design is presented as a platform for skin-mounted wearable and stretchable electronics. The electronic components of the design were distributed between ...islands connected by stretchable serpentine structures. The analytical results show that at 20% overall elongation, the serpentines stretch 60% due to the rigidity of the islands. This 20% elongation is defined as the system stretchability. The 60% elongation on the serpentines is defined as the effective stretchability. At 60% effective stretch, the calculated equivalent plastic strain in a serpentine interconnect is 0.67%, which is well below the fracture limit of copper. Elongation experiments show that the archipelago structure has the system stretchability up to 76% for one-time-stretching, translating to 228% of the effective stretchability on the serpentines. Fatigue-tension experiments show that at 20% system stretch, the archipelago structure can withstand on average 71,950 cycles without electrical or mechanical degradation.
Background: Hemodialysis (HD) is one of the most common causes of blood-borne infections. In order to prevent viral hepatitis and confront with the virus on the next step, health providers specify ...infected patients by screening and vaccination. This study is designed to investigate the prevalence of Hepatitis B virus (HBV) and Hepatitis C virus (HCV) infections in HD patients in Mazandaran, Iran. Methods: The medical records of 216 patients referred to the hemodialysis centers were evaluated in this cross-sectional study between 2019 and 2020. The collected data was analyzed using t-test and Chi-square. Results: Among 216 patients, 106 cases were female (49.07%) and 110 subjects were male (50.9%). The mean age was 40.1 y/o in females and 50.9 y/o in the male patients. The study recorded nine HBs-Ag positive (prevalence: 0.06%) and 15 HCV-Ab positive (prevalence: 6.94%) patients. Also, the most common co-morbidities were diabetes and hypertension. It was observed that 13 patients from 34 patients with negative HBs-Ag (who had 10-100 U HBs-Ab in the first stage) experienced sudden drop in the antibody titration to less than 10 U (P < 0.05). From 50 HBs-Ag negative patients with HBs-Ab more than 100 U in the first stage, antibody titration of five patients was decreased to less than 10 U in the second stage (P < 0.05). Conclusions: The prevalence of HCV and HBV was low in HD patients in Mazandaran province. However, due to the large number of patients with non-protective HBs-Ab levels, there is a risk of an increased prevalence of the disease.
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Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
