Endoscopic biliary drainage (EBD) is one of the effective methods for palliation of malignant biliary obstructions and bridging of benign bile duct stricture. Unfortunately, although many kinds of biliary stents have been used to matain patency
of
bile
duct, the long term functioning of these biliary stents is limited by clogging, dislodgement, inward migration. In as far as malfunction of implanted stents can not be prevented, exchange of the stents remain important. So, e report on the
results
of
endoscopic retrievals by using 4 different devices; Dormia basket, Soehendra retrieval device, polypectomy snare and biliary stent retrieval forceps in 132 pateitns. Total success rate of Dormia basket was 91.0% (71/78), Soehendra retrieval
device
95%
(19/20). The 5 of 7 patitns who had failure of retrieval by Dormia basket were attempted by polypectomy snare, the other 2 patients by retrieval forceps. The one who had failure of retrieval device was attempted by retrieval forceps. Total
success
rate
of polypectomy snare was 81.3% (13/16), retrieval forceps 100% (26/26). In cases with clogged stents or indwelled stents beyond 3 months, each success rates of 4 endoscopic retrieval methods were not different; Dormia basket 100% (66 of 66
cases),
polypectomy snare was 100% (8 of 8 cases), retrieval forceps 100% (22 of 22), and Soehendra retrieval device 95% (19/20). In the cases with dislodged stents, the highest success rate for retrieval of stent among 4 endoscopic methods was shown in
retrieval forceps; Dormias basket was 50% (4 of 8 cases), polypectomy snare 50% (2 of 4 cases), and retrieval forceps 100% (4 of 4). In cases with inward migrated stents, the success rate of polypectomy snacre was better than Dormia basket;
Dormia
basker 25% (1 of cases), polypectomy snare 75% (3 of 4 cases).
These results indicated that in the cass with dislodged stent outide the bile duct, endoscopic retrieval of the stent by using the retrieval forceps will be more profitable, and in the cases with migrated inwared the bile duct, endoscopic
retrieval
of
the stent by using the polypectomy snare will be more profitable. Soehendra device had the advantages that withdrawal and reinsertion of the endoscope was obviated and the new stent can be implanted at same site without losing the original
pathway,
but
the device was difficult or not profitable in the cases who had the dislodged stents outside or inside the bile ducts.
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