Some of the semen that travels from the seminal vesicles to the urethra will move up into the bladder. He said the semen is harmless in the bladder as long as it can be urinated out again. The balloon at the very end of the catheter is inflated to position the microwave antenna in the prostate. Chilled water is circulated through the catheter to protect healthy urethral tissue. The heat shrinks the tissue and eliminates obstruction of the urethra.
Chilled water continues to circulate after the microwave is turned off to eliminate residual heat.
And then the catheter is removed. There are strong identifiable risk factors that determine who will have prostatic hyperplasia. Hyperplasia can occur in a man as early as his 30s, but symptoms wouldn't appear until his 50s.