Which device filters a patient’s blood to remove excess water and waste products when the kidneys are damaged?

• A. Infusion Pump
• B. Dialysis Machine
• C. Medical Ventilator
• D. Surgical Laser

Answer: (B)

Dialysis replaces kidney function by filtering blood. When kidneys are damaged and can’t remove waste or excess fluid, a dialysis machine takes blood from the body, runs it through a filter called a dialyzer, and returns cleaned blood. The dialyzer uses diffusion to remove waste products like urea and creatinine and ultrafiltration to remove extra water, helping restore balance until kidney function can recover or another long-term solution is used. Other devices have different roles: an infusion pump delivers fluids or meds, a medical ventilator supports breathing, and a surgical laser cuts or reshapes tissue.