Development of Lung Vibration Equipment

Inclusion Criteria: * Male or female * Aged 18-59 years * Inpatients at Burapha University Hospital, Mueang District, Chonburi Province, with pulmonary secretion retention * Referred by their attending physician for enhanced secretion clearance through physical therapy methods Exclusion Criteria: * Having inflamed wounds on the chest or back * Having unstable vital signs, defined as: resting heart rate \<60 or \>100 beats per minute; blood pressure \<90/60 or \>120/80 mmHg; respiratory rate \<12 or \>20 breaths per minute; oxygen saturation \<95%; and body temperature \>37°C * Having a bleeding tendency, defined as a platelet count \<20,000 per cubic millimeter * Taking medications that increase bleeding risk within 7 days prior to participation, including: Anticoagulants (such as Warfarin, Dabigatran, Rivaroxaban, Apixaban, Edoxaban), Antiplatelet agents (such as Aspirin, Clopidogrel, Dipyridamole, Prasugrel, Ticagrelor) * Having an International Normalized Ratio (INR) \>1.1 for those not on anticoagulants, and \>3.0 for those on anticoagulants * Having subcutaneous emphysema * Experiencing severe hemoptysis (coughing up blood) * Having chest wall pain * Having acute spinal cord injury, rib fractures, or conditions associated with high fracture risk * Having skin grafts or burn wounds * Being admitted to intensive care units (ICU, RICU, or CICU) * Having untreated pneumothorax * Having an acute inflammatory process of the respiratory system * Having inflammatory or infect…