To Evaluate the Feasibility, Preliminary Safety and Performance of Rezūm System in BPH Treatment in China

International prostate symptom score (IPSS) is a questionnaire used to indicate the severity of LUTS symptoms, There are 7 questions relating to different symptoms subjects be experiencing.

7 questions about patients' urinating include Incomplete emptying, Frequency, Intermittency, Urgency, Weak stream, Straining and Nocturia, every question have 0-5 scores according to Prostate Symptom, the higher score mean patient have more severe the symptoms.

IPSS total score: the minimum score is 0 and maximum score are 35. IPSS total 0-7 scores are mild symptoms, IPSS total 8-19 scores are moderate symptoms and IPSS total 20-35 scores are severe symptoms The change was the value at the baseline minus the value at last follow-up date, anywhere between month 3 - month 6 minus

Composite device related serious complications for this endpoint are defined as:

• Device perforation of the rectum or GI tract;
• Device related formation of fistula between the rectum and urethra;
• De novo severe urinary retention lasting more than 21 consecutive days post treatment.

Rezūm procedure time is refers to the urethral entry of the catheter by Rezūm and exit after the ablation of the catheter by Rezūm

Length of Catheterization is the date from date of catheter implantation to date of catheter removal

The change of Peak Flow Rate (Qmax) from baseline to the last follow-up date, anywhere between month 3 - month 6 post Rezūm procedure. Which are the value at the last follow-up date, anywhere between month 3 - month 6 minus value at baseline

The change of Post Void Residual Urine Volume (PVR）from baseline to the last follow-up date, anywhere between month 3 - month 6 post Rezūm procedure. The change are the baseline value minus the value at the last follow-up date, anywhere between month 3 - month 6 minus.

The change of Quality of Life from baseline to the last follow-up date, anywhere between month 3 - month 6 post Rezum procedure. There is only 1 question about Quality of life due to urinary symptoms which is 'If you were to spend the rest of your life with your urinary condition the way it is now, how would you feel about that?' This question have 0-6 scores according to patient's satisfaction about Quality of Life, the higher score mean patient have poor satisfaction.

The change was the baseline value minus the value at the last follow-up date, anywhere between month 3 - month 6.

The change of Ejective function-Male Sexual Health Questionnaire Short Form- Ejaculation dysfunction（MSHQ-EjD ) from baseline to the last follow-up date, anywhere between month 3 - month 6 post Rezum procedure. Ejective function (MSHQ-EjD) is a questionnaire used to assess the ejective function. There are 4 questions relating to Ejaculation dysfunction which need patients to answer.

3 questions about patients' ejective function assessing include completion of ejaculation, Strength of ejaculation and Volume of semen when ejaculation. Every question have 0-5 scores according to assessing the ejective function, the lower score mean patient have more severe the ejective function.

MSHQ-EjD total score: the minimum score is 0 and maximum score are 15. The change are the value at the last follow-up date, anywhere between month 3 - month 6 minus value at baseline

The change of the International Index of Erectile Function(IIEF) from baseline to the last follow-up date, anywhere between month 3 - month 6 post Rezum procedure. Erectile Function(IIEF) is a questionnaire used to assess the Sexual Health Inventory of men. There are 5 questions relating to Erectile Function which need patients to answer. Every question have 0-5 scores, the lower score mean patient have more severe the Erectile Function.

The IIEF-5 is administered as a screening instrument for the presence & severity of ED in conjunction with the clinical assessment. The score is the sun of the responses to the five items, so that overall score may range from 0 to 25. A score of 20 or higher indicates a normal degree of erectile functioning. Low scores (10 or less) indicate moderate to severe ED.

The change are the value at the last follow-up date, anywhere between month 3 - month 6 minus value at baseline