Evaluation of Safety and Efficacy of Pivot Balloon to Monitoring Acute RV Failure and Reduction of FTR

Inclusion Criteria: * Adult males and females aged 20 years or above * Target of Thoracic Surgery for TR and patients above the severe level on the criteria presented in the Classification of TR Grade based on echocardiogram, among those with TR, for whom a surgical treatment has been decided * An individual who voluntarily agreed to the participation in the clinical trial and signed the written consent * An individual who is able to understand and comply with the instructions and who can participate in the period before the clinical trial Exclusion Criteria: * Uncontrolled hyperthyroidism * A recent formation of soft blood clot or embolic material * Uncorrected coagulopathy * Prohibition of anticoagulant agents * Previous insertion of a device such as an Implantable Cardioverter Defibrillator (ICD) or a pacemaker * Presence of malignant tumor or benign tumor such as myxoma in the heart * Presence of a symptom of active infection * Chronic pulmonary disease * Congenital tricuspid valve insufficiency * Pregnant or lactating mother, or a female patient planning pregnancy during the period of clinical trial, or a female not using an approved contraceptive with the possibility of pregnancy * Participation in another clinical trial 30 days prior to the screening * In addition, anyone showing a clinical finding deemed to be unsuitable for the clinical trial by the Principal Investigator or the Investigator