"To relieve the obstruction" means to remove or lessen something that is blocking or clogging a pathway, object, or process in order to allow for smoother functioning or progress. Full definition
Treatment of UO consists of sedating the cat and relieving the obstruction by placing a urinary catheter into the urethra. (tuftscatnip.com)
Other therapeutic endoscopic procedures Dr. Siddiqui performs include endoscopic retrograde cholangiopancreatography (ERCP) with removal of stones and stenting of tumors to relieve obstruction in both the bile and pancreatic ducts, drainage of pancreatic cysts, nerve block for pain related to pancreatic cancer, radiofrequency ablation of Barrett's esophagus, and endoscopic mucosal resection (EMR) of large polyps or small tumors in the GI tract. (uchospitals.edu)
Stent placement, which involves the insertion of an expandable, metal tube to relieve obstructions of the stomach and allow the patient to continue eating. (uchospitals.edu)