Safety and Efficacy of TaurusOne® Transcatheter Aortic Valve Replacement System With Retrievable Delivery Catheter System

Study Overview
=================
Brief Summary
-----------------
The TaurusOne® transcatheter aortic valve system with retrievable delivery catheter system is evaluated the safety and effectiveness for the delivery of artificial aortic valve in a prospective, multicenter, single-arm clinical trial.

Detailed Description
-----------------
The TaurusOne® transcatheter aortic valve system with retrievable delivery catheter system is evaluated the safety and effectiveness for the delivery of artificial aortic valve in a prospective, multicenter, single-arm clinical trial. According to the inclusion and exclusion criteria, sixty patients are planed been enrolled and implanted with TaurusOne® .Patients are seen at pre and post procedure, discharge, 30 days. The main follow-up included clinical symptoms and signs, cardiac ultrasound, CT, etc. The outcome included immediate device success, procedure success, And the major cardiovascular and cerebrovascular adverse events (MACCE, including mortality, stroke, myocardial infarction, reoperation, arrhythmia, conduction block).

Official Title
-----------------
A Prospective，Multicenter, Single-arm Clinical Trial to Evaluate Safety and Efficacy of TaurusOne® Transcatheter Aortic Valve Replacement System With Retrievable Delivery Catheter System

Conditions
-----------------
Aortic Stenosis

Intervention / Treatment
-----------------
* Combination Product: The experimental apparatus consisted of artificial aortic valve, transporter and grip-loading system.


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Patients who are willing to participate and sign the informed consent and can cooperate with the whole trial process; Age ≥70 years old; Patients with severe calcified aortic stenosis confirmed by echocardiography (trans-aortic valve flow velocity ≥ 4.0m /s, or trans-active valvular pressure difference ≥40mmHg (1mmHg=0.133kPa), or aortic valve orientation area < 0.8cm2, or effective aortic valve orifice the product index is < 0.5cm2/m2); Appear obvious symptoms caused by aortic stenosis, NYHA class Ⅱ or higher; The cardiac team (at least two specialists in cardiovascular surgery) assessed the patient as unsuitable for routine surgery ; The life expectancy of the patient after implantation of the prosthetic valve was evaluated by the cardiac team (at least two specialists in cardiovascular surgery) as more than one year; Patients with aortic ring diameter ≥18mm and ≤29mm (cardiac CT measurement); The diameter of the ascending aorta of the patient was < 50mm. Exclusion Criteria: Patients with bacteremia or toxemia; previous history or active endocarditis; Acute myocardial infarction (Q-wave MI, or non-Q-wave MI with increased creatine kinase isoenzyme and/or troponin T) within 30 days; Echocardiography found any intracardiac mass, left ventricle or atrial thrombosis, vegetations; Symptomatic atrial fibrillation that cannot be improved by medication; Familial hypertrophic cardiomyopathy; Mitral valve and tricuspid valve insufficiency (reflux Ⅱ level above); Prior aortic valve grafts (mechanical or biological valve stents); Known allergy to contrast agent, aspirin, heparin, ticlopidine, nickel-titanium memory alloy, or bovine products; Known to be contraindication or allergic to all anticoagulant regimens, or unable to use anticoagulant during the test; Other serious diseases that may reduce life expectancy to less than 12 months (e.g. clinically recurrent or metastatic cancer, congestive heart failure, etc.) Current drug abuse problem (e.g., alcohol, cocaine, heroin, etc.); Plan to undergo surgery that may cause nonadherence to protocol or confusion in data interpretation. Cerebrovascular accident (CVA) in the past 6 months; Patients with common or internal carotid or vertebral artery stenosis (> 70%); WBC count < 3×109/L, platelet count < 50×109/ L; Hemoglobin < 90g/L; Patients with severe coagulation dysfunction; Severe left ventricular dysfunction, left ventricular ejection fraction < 20%; Abdominal or thoracic aortic aneurysm; Hepatic encephalopathy or acute active hepatitis; Receiving dialysis or a baseline creatinine level of > 3.0 mg/dL (266μmol/L); Have bleeding tendency or history of coagulation disease or refuse blood transfusion; Have active gastric ulcer or active gastrointestinal (GI) bleeding; Suffer from neurological diseases that seriously affect the ability to move or live in daily life; People with mental illness or mental disorder who cannot express themselves normally; Need emergency surgery for any reason; Screening participants who had participated in other drug or medical device clinical trials within the previous 3 months; Other conditions considered by the investigator to be inappropriate for participation in this clinical trial.

Ages Eligible for Study
-----------------
Minimum Age: 70 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Interventional Model Description: Preliminary data from the TaurusOne® clinical trial show good safety and efficacy in this trial without altering the artificial aorta To evaluate the safety and effectiveness of a transporter with a recoverable function. Take TaurusOne® in a clinical trial of compounding Endpoint event incidence was used as a target control.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: A single set of test<br>The experimental apparatus consisted of artificial aortic valve, transporter and grip-loading system. | Combination Product: The experimental apparatus consisted of artificial aortic valve, transporter and grip-loading system.<br>* Using the grip-loading system, the artificial aortic valve was squeezed and loaded into the sheath of the transporter through the vascular approach.The artificial aortic valve is delivered and positioned at the correct anatomical position for release. For example, the artificial main valve is displayed after partial release If the aortic valve is not in the correct anatomical position, the artificial aortic valve can be recovered and placed into the sheath tube of the transporter for re-positioning and release.<br>* Other names: The TaurusOne® transcatheter aortic valve replacement system features a retrievable delivery catheter system;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Composite event rate at 30 days | Patient-oriented composite event including all-cause death，severe stroke，myocardial infarction, permanent pacemaker implantation，surgical reoperation and valve-in-valve. | 30 days after procedure | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Device success rate (immediately after procedure) | Device success is defined as Vascular access, artificial aortic valve delivery and release were successful, and the delivery catheter was successfully withdrawn. The artificial aortic valve was implanted in an anatomically accurate position. The artificial aortic valve met the expected requirements (mean transvalvular pressure difference < 20mmHg or maximum flow rate < 3m/s; No serious manual initiative valve regurgitation or perivalvular leakage) | Immediately after procedure | 
| Procedure success rate | Procedure success is defined as the artificial aortic valve successfully implanted in the correct anatomical position 72h after surgery or before discharge without severe artificial aortic valve regurgitation or perivalvular leakage. | 72 hours after procedure/prior to discharge | 
| Cardiac function improvement | Cardiac function improvement is accessed by NYHA cardiac function classification increases from baseline to 30 days. | 30 days after procedure | 
| Quality of life of patients | Quality of Life of patients accessed by EuroQol-5 Dimensions (EQ-5D) Questionnaire. The higher scores mean a worse health state. Recording changes from baseline to 30 days. | 30 days after procedure |