The hidden "anchor" inside the bladder: How does a catheter stay in place without falling out? ​It seems like magic, but it is actually brilliant engineering. When a patient cannot urinate—whether due to surgery, a blockage like an enlarged prostate, or nerve damage—the bladder becomes a dangerous pressure cooker that can damage the kidneys. Enter the Foley catheter. ​The process is precise: a flexible, sterile tube is guided through the urethra and into the bladder. But here is the "crazy facto