In order to characterize the characteristics of pathological tremor of human upper limb, a simulation system of pathological tremor of human arm was provided and its dynamic response was analyzed. Firstly, in this study, a two-degree-of-freedom human arm dynamic model was established and linearized according to the arbitrary initial angle of joints. After solving the analytical solution of steady-state responses of the joints, the numerical solution was used to verify it. The results of theoretical analysis show that the two natural frequencies of the developed dynamic model are 2.9 Hz and 5.4 Hz, respectively, which meet the characteristic frequency range of pathological tremors. Then, combined with the measured parameters of human arm, a tremor simulation system was built, and the measured results of joint responses are in good agreement with the theoretical and simulation analysis results, which verifies the effectiveness of the theoretical model. The results show that the human arm pathological tremor simulation system designed in this paper can characterize the frequency and response amplitude of the human upper limb pathological tremor. Moreover, the relevant research lays a theoretical foundation and experimental conditions for the subsequent development of wearable tremor suppression devices.
Objective To explore the feasibility and safety of tension-free vaginal tape-obturator for female stress urinary incontinence under the daytime surgical mode based on the concept of enhanced recovery after surgery. Methods The clinical data of female patients with stress urinary incontinence at the First Affiliated Hospital of Kunming Medical University between June 2019 and June 2023 were retrospectively analyzed. According to the perioperative management mode of patients, they were divided into daytime surgery group and routine surgery group. The basic, intraoperative, and postoperative conditions of two groups of patients were compared. Results Finally, 183 patients were included, including 91 in the routine surgery group and 92 in the daytime surgery group. All patients successfully completed the surgery. There was no statistically significant difference in age, preoperative comorbidities, surgeon in chief, or operation duration between the two groups of patients (P>0.05). The preoperative waiting time after hospitalization [(0.00±0.00) vs. (2.42±0.58) d], hospitalization expenses [(13815.10±2906.01) vs. (18095.21±3586.67) yuan], total surgical expenses [(3961.36±707.35) vs. (4440.19±1016.31) yuan], anesthesia expenses [(718.53±61.06) vs. (755.30±74.65) yuan], western medicine expenses [(818.07±259.30) vs. (1282.14±460.75) yuan], total hospitalization duration [(1.11±0.31) vs. (5.77±1.30) d], and postoperative hospitalization duration [(1.11±0.31) vs. (3.35±1.42) d] in the daytime surgery group were lower than those in the routine surgery group (P<0.05). There was no significant difference between the two groups in postoperative complications (respiratory complications, fever, nausea and vomiting, vaginal bleeding, urinary retention, peritonitis), satisfaction, postoperative pain or self perception of symptom improvement (P>0.05). Conclusion The daytime surgery for female stress urinary incontinence based on the concept of enhanced recovery after surgery is safe and feasible, which can shorten hospitalization duration and reduce hospitalization costs.