Bypass surgery refers to a class of surgery involving rerouting a tubular body part.^[1]

Types include:

• Vascular bypass surgery such as coronary artery bypass surgery, a heart operation, in which the internal thoracic artery and great saphanous vein are used to bypass the coronary artery.^[2]
• Cardiopulmonary bypass, a technique used in coronary artery bypass surgery
  • In on-pump bypass surgery, a heart-lung machine is used; in off-pump bypass surgery, the surgeon stabilizies the heart without use of the machine.^[3]
• Weight loss or Bariatric surgery:
  • Vertical banded gastroplasty surgery or "stomach stapling", the upper part of the stomach is permanently stapled to create a smaller pouch
  • Adjustable gastric band or "lap band", a band creates a pocket in the stomach that can be adjusted with a port placed just under the skin
  • Roux-en-Y gastric bypass surgery, the small intestine is connected to the upper part of the stomach
  • Partial ileal bypass surgery, shortening the final portion of the small intestine
  • Popliteal bypass surgery, to treat diseased leg arteries above or below the knee
  • Jejunojejunostomy, surgery that connects two portions of small intestine and is no longer used
    • Ileojejunal bypass, surgery that connects the middle and final portions of the small intestine that was experimental and is no longer used.