Wheelchair Automatic Docking Method for Body-Separated Nursing Bed Based on Grid Map

Abstract

To improve the mode and precision of wheelchair/nursing-bed automatic docking, a novel central embedded wheelchair/nursing-bed automatic docking method based on grid map is proposed. Firstly, Laplace operator and Iterative Closest Point (ICP) algorithm are used to filter and match Lidar point cloud, and the linear features of V-shaped artificial landmark are fitted by Split-merge method and least square method. Then Extended Kalman Filter (EKF) is used to fuse Inertial Measurement Unit (IMU) and odometer data to realize the localization of the bed and wheelchair. Meanwhile, the grid map is used for path planning. Based on the center-line of the two rear wheels and the angular bisector of V-shaped artificial landmark, the wheelchair pose is adjusted in real-time to ensure that the wheelchair gradually approaches the bed along the angular bisector of V-shaped artificial landmark. The yaw angle is reduced by using the improved Proportion Integration Differentiation (PID). 9 sets of experimental data, ie. (x, y,  ) were collected at different starting positions during the docking process. The results show that the yaw angle of the wheelchair during the docking process is controlled within 2.5°, and the distance deviation between the final position and the ideal position of the wheelchair after docking is controlled within 0.02m. In the case of light interference with different luminous fluxes, the docking can still maintain good performance. The proposed docking algorithm has the robust performance of rapid response and low steady error, which can greatly improves the self-care ability of the bedridden elderly, and reduces the labor intensity of the nursing staff.

Application of Clinical Pathway Teaching Model In nursing Teaching of Respiratory Department

“…Some scholars mentioned that medical college students lack of basic knowledge of traditional Chinese medicine theory and doctor-patient communication. Other scholars believe that the curriculum of medical college is mainly based on classroom teaching, ignoring the importance and insufficient attention of extracurricular practice and practice, resulting in poor teaching effect and difficult to achieve the expected goal [5,6]. Other scholars systematically analyze the physiological and psychological characteristics of patients, through clinical pathway teaching, make them master correct and effective life skills, improve their self-protection ability, and strengthen cooperation, exchange and learning with medical colleges [7,8].…”