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( Divij Jayant ),( Atul Parashar ),( Ramesh Sharma ) 대한외상학회 2023 大韓外傷學會誌 Vol.36 No.4
Purpose: This study investigated the epidemiology, management, outcomes, and postoperative disabilities of degloving soft tissue injuries (DSTIs) treated at a tertiary care center in northern India. Methods: A prospective study of patients with DSTIs was conducted over 15 months. The type of degloving injury, the mechanism of injury, and any associated injuries were analyzed using the World Health Organization Disability Assessment Schedule (WHODAS) 2.0 along with the management, outcomes, and disabilities at a 3-month follow-up. Results: Among 75 patients with DSTIs, the average age was 27.5 years, 80.0% were male, and 76.0% had been injured in traffic accidents. The majority (93.3%) were open degloving injuries. Lower limbs were affected most often (62.7%), followed by upper limbs (32.0%). Fractures were the most commonly associated injuries (72.0%). Most patients required more than two procedures, including secondary debridement (41.3%), split skin grafting (80.0%), flap coverage (12.0%), or vacuum-assisted closure (24.0%), while five patients underwent conservative management for closed degloving injuries. Postoperative complications included surgical site infections (14.7%) and skin necrosis (10.7%). Two patients died due to septic shock and multiple organ dysfunction syndrome. The mean length of hospital stay was 11.5±8.1 days, with injuries affecting the lower limbs and perineum requiring longer hospital stays. The mean WHODAS 2.0 disability score at 3 months was 19. Most patients had mild disabilities. Time away from work depended largely upon the site and severity of the injury. Approximately 75% of patients resumed their previous job or study, 14% changed their job, and 8% stopped working completely due to residual disability. Conclusions: DSTIs are common injuries in trauma and management is challenging. Although open DSTI are clinically evident at secondary survey, closed degloving injuries may be missed in the primary survey, necessitating a high index of suspicion, thorough clinical examination, and protocol-based management. Primary preventive strategies (e.g., road safety protocols, preplacement training, and proper protective equipment in industries) are also needed to reduce the incidence of these injuries.
Wearable elbow rehabilitation system using self-powered sensors
Divij Bhatia(바티아 디비제이),Seong Hyeon Jo(조성현),Yusung Kim(김유성),Dong Hyun Kim(김동현),Hyung-Soon Park(박형순) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Increasing movement frequency and patient engagement is a crucial part of the rehabilitation process. One approach for integrating productive rehabilitation tasks with motivational features is through an interactive game. Furthermore, if moving the impaired body part can generate electricity to power the system it could motivate the patient even more. Therefore, in this work we developed a wearable elbow rehabilitation system using self-powered sensors based on the triboelectric nanogenerator. The system consisted of a 3D printed body integrated with the self-powered sensors that could provide real-time elbow joint motion data. After digitizing the acquired data, the elbow motion could manipulate objects in an interactive game made in Python language. We first provide detailed analysis of the system design and the triboelectric nanogenerator output which was enhanced using gears and material surface nano-patterning. Next we describe the sensor data processing circuit and game control using Arduino, based on the direction and extent of forearm motion. Finally we tested the wearable system and game on healthy subjects and stroke patients and analyzed the differences in subject performance which reflected their impairment level. We expect that our self-powered rehabilitation system could be used as a practical solution for home based elbow rehabilitation therapy.
Bhatia, Divij,Kim, Wook,Lee, Sangmin,Kim, Sang Woo,Choi, Dukhyun unknown 2017 Nano energy Vol.33 No.-
<P><B>Abstract</B></P> <P>Triboelectric nanogenerators (TENG) can effectively generate electrical energy from the otherwise wasted mechanical energy in our environment. However, since vibration energy scavengers are usually driven at their resonant frequency, vibrating TENGs (VTENG) can provide maximized output power only within a few Hz of input frequencies. Here, we report tandem TENGs which are able to optimally scavenge abundant vibration energy under a wide band of input frequencies (tens of Hz and beyond). We first investigate the dynamic response of a single VTENG by parametric analyses (external forces, mass, stiffness, and gap distance) according to input frequencies. Based on coupled behavior, we complete a design protocol for a single VTENG, providing optimal power generation at a given frequency. Finally, we demonstrate a tandem system of resonant VTENGs, where maximum output power can be produced over a broad range of input frequencies between 15 and 40Hz. It is expected that our design protocol enables optimal energy conversion for an individual TENG and that tandem design will be practically useful for consistently scavenging a wide band of vibration energy from environmental sources such as vehicles, wind, and waves.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We propose tandem triboelectric nanogenerators for wide bandwidth vibration energy scavenging. </LI> <LI> We conducted systematic parametric study for vibration type triboelectric nanogenerator (VTENG) to determine the design equations. </LI> <LI> We completed a design protocol for fabricating a resonant VTENG to ensure maximum power output. </LI> <LI> Finally, we demonstrated working tandem system of optimally designed VTENGs for targeted frequency range. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>