Attakorn Suwananthawong and Dulyachot Cholaseuk, "A STUDY ON ERGONOMIC EGG-SHAPED FOUR-BAR LINKAGE PROPULSION MECHANISM FOR MANUAL WHEELCHAIRS" , 29 June 2020​.

Abstract
Most manual wheelchair users use conventional push-rim wheelchairs. Although manual push-rim wheelchairs help promotes a good lifestyle, the non-ergonomic, high muscular demand of non-continuous push motions can trigger severe upper extremity injuries. In this study, a new four-bar linkage propulsion mechanism is introduced. The mechanism was designed to provide continuous propulsion while allowing the wrist movement to follow the ergonomic egg-shaped path. A prototype was built and tested. User opinions
indicated that they experienced a more comfortable ride than in the conventional push-rim wheelchair. Overall, the use of the four-bar linkage mechanism causes less strain to muscles and should reduce fatigue during prolonged usages.​

mamom J., Ruchiwit M, Hain D. "​Strategies of Repositioning for Effective Pressure Ulcer Prevention in Immobilized Patients in Home-Based Palliative Care: An Integrative Literature Reviews", June 2020​

Abstract
          An integrative literature review was conducted to assess available scientific evidence about best strategies of repositioning along with medical devices in the prevention of pressure ulcers in immobilized patients in home-based palliative care. It is important to have evidence-based strategies and principles to prevent pressure ulcers in immobilized patients receiving homebased palliative care. However, there is a lack of consistency in protocol especially in Thailand. This review was done first by searching related literature through electronic databases including Cochrane, PubMed, Web of Science, Scopus, MEDLINE, ProQuest, and CINAHL that were published between 2010 and 2019. The PRISMA guidelines were used to structure the review. The findings of the review indicated that the best method or repositioning was 30° lateral tilt every 2-3 hours. However, alternative strategies, such as a combination involving medical devices such as a special mattress or automatic bed that can extent the duration of repositioning from every two hours to three to four. There is a need for further research examining the effectiveness of 3-hourly repositioning with use of a medical device that could reduce risk of pressure ulcers while reducing the burden on family caregiver.