ABSTRACT
A protective device was designed that can be worn on the elderly, which consists of protective airbag, control box and protective mechanism. The combined acceleration, combined angular velocity and human posture angle are selected as the parameters to determine the fall, and the threshold algorithm and SVM algorithm are used to detect the fall. The protective mechanism is an inflatable device based on CO2 compressed air cylinder, and the equal-width cam structure is applied to its transmission part to improve the puncture efficiency of the compressed gas cylinder. A fall experiment was designed to obtain the combined acceleration and angular velocity eigenvalues of fall actions (forward fall, backward fall and lateral fall) and daily activities (sitting-standing, walking, jogging and walking up and down stairs), showing that the specificity and sensitivity of the protection module reached 92.1% and 84.4% respectively, which verified the feasibility of the fall protection device.
Subject(s)
Humans , Aged , Monitoring, Ambulatory , Activities of Daily Living , Wearable Electronic Devices , Walking , Acceleration , AlgorithmsABSTRACT
Objective To discuss the clinical effect of prophylactic abdominal aorta balloon occlusion with Fogarty catheter before cesarean section in treating delivery woman with pernicious placenta previa.Methods The clinical data of 12 delivery women with pernicious placenta previa,who received prophylactic abdominal aorta balloon occlusion with Fogarty catheter before cesarean section,were retrospectively analyzed.The curative effect was evaluated.Results The average intraoperative blood loss in the 12 patients was (1256±318) ml.The uterus was successfully retained in 9 patients.Hysterectomy had to be carried out in 3 patients because of refractory hemorrhage;one of them had to receive total hysterectomy together with bladder repair as the placenta had penetrated into the bladder wall.After delivery no complications,such as infection,delayed hemorrhage,lower limb thrombosis,etc.,occurred.All 12 neonates were born smoothly.Conclusion Prophylactic abdominal aorta balloon occlusion with Fogarty catheter before cesarean section can effectively reduce intraoperative blood loss and help save the uterus.Therefore,it is a safe and effective therapeutic means for delivery woman with pernicious placenta previa before the performance of cesarean section.