Research On The Influence Of Resistive Heating Blanket Heating Process On Airflow And Biological Particle Diffusion In Operating Room

Due to anesthesia and other effects,patients in the hospital during the surgery,the metabolic rate is low,the core temperature in the body will often drop significantly,the too low core temperature has an important impact on the postoperative recovery of patients,and even endanger the safety of life.To effectively prevent the temperature of patients from falling significantly during surgery,local heating methods are usually adopted to cover patients with heating and insulation,among which resistance heating blanket is one of the most commonly used methods.However,there are few studies on the effect of local hot plumes formed during the heating process of resistance heating blanket on airflow disturbance in operating room and the effective elimination of biological particles.To investigate the influence of the heating process of the resistance heating blanket on the flow field and biological particle diffusion in the operating room of a hospital,the model bacteria emission experiment and numerical simulation study were carried out in a full-size standard operating laboratory.Firstly,Bacillus subtilis was used as the model bacterium,and the concentration of bacterial solution was 1.415×10~7CFU/m L.Bioaerosol release experiments were carried out at two different release locations,repeated three times in each working condition.Under the vertical ceiling air supply mode,airflow velocity and spatial concentration of biological particles were measured at different typical locations.Based on the actual size of the standard laboratory and the arrangement of the experimental process,the corresponding numerical model was established,and the measured data obtained from the laboratory were compared with the simulation data to further verify the reliability of the numerical simulation.Then,the influence of the resistance heating blanket on airflow disturbance and biological particle distribution in operation area under three different covering modes(Surgical table cover;The patient is covered above the body;Both the operating table and the patient’s body are covered)of the resistive heating blanket was studied.The results show that the vertical unidirectional flow is easily affected by the heat flow generated by local heating.The heat generated by the resistive heating blanket reduces the airflow velocity above the patient and increases the concentration of biological particles above the patient.The heating process of the heating blanket has a great influence on the airflow disturbance in front of the doctor,but has little influence on the airflow disturbance and biological particle diffusion in the back of the doctor.In addition,different covering methods of the resistive heating blanket had different effects on airflow and biological particle distribution in the operating area.The concentration of biological particles above the operating table increased significantly when patients were covered with a heating blanket,but did not increase when the heating blanket wasspread on the operating table.At present,the resistance heating blanket can effectively maintain the core temperature of patients,but is not conducive to the control of biological particles around patients,and increases the potential infection risk of patients to a certain extent.In the future,more appropriate heating methods for patients need to be studied.This study can provide a scientific basis and suggestions for the selection of patients with covered heating and insulation during the existing surgical procedures.