Without artificial airway though oral,nasal or airway incision,the bi-level positive airway pressure(BiPAP)has been widely employed for respiratory patients.In an effort to investigate the therapeutic effects and measures for the respiratory patients under the noninvasi...MORE Without artificial airway though oral,nasal or airway incision,the bi-level positive airway pressure(BiPAP)has been widely employed for respiratory patients.In an effort to investigate the therapeutic effects and measures for the respiratory patients under the noninvasive Bi-PAP ventilation,a therapy system model was des...