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CC BY 4.0 · Endoscopy 2025; 57(S 01): E271-E272
DOI: 10.1055/a-2559-9546
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Novel self-expandable metal stent with dumbbell-shape and spiral cover to prevent stent-related cholecystitis

Haruo Miwa 
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Yugo Ishino
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Shotaro Tsunoda
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Ritsuko Oishi
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Kazuki Endo
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Yuichi Suzuki
1   Gastroenterological Center, Yokohama City University Medical Center, Yokohama, Japan (Ringgold ID: RIN26437)
,
Shin Maeda
2   Department of Gastroenterology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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Covered self-expandable metal stents (cSEMS) are commonly used to treat malignant distal biliary obstruction (MDBO) [1]; however, they can lead to cholecystitis [2] [3]. A novel stent – the HILZO dumbbell-shaped stent with spiral cover (ABIS Inc., Hyogo, Japan) was designed to prevent stent-related cholecystitis [4]. The dumbbell-shaped proximal end creates space around the orifice of the cystic duct (OCD), while the spiral outer cover facilitates bile flow ([Fig. 1], [Fig. 2]). Herein, we report two cases of MDBO in which the novel cSEMS was placed beyond the OCD ([Video 1]).

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Fig. 1 A novel HILZO dumbbell-shaped stent with spiral cover (ABIS Inc., Hyogo, Japan) is designed to prevent stent-related cholecystitis.
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Fig. 2 The spiral outer cover allows bile to flow out through the gaps (arrows).

Qualität:
The novel HILZO dumbbell-shaped stent with spiral cover (ABIS Inc., Hyogo, Japan) can prevent stent-related cholecystitis in patients with malignant distal biliary obstruction.Video 1

Case 1: A 62-year-old woman with MDBO secondary to pancreatic cancer was referred to our hospital. Endoscopic retrograde cholangiopancreatography was performed due to recurrent biliary obstruction after initial cSEMS placement. Cholangiography revealed the OCD above the biliary stricture. The novel cSEMS (8 mm, 7 cm) was deployed to cover the OCD with the covered part of the stent. Although contrast medium pooled in the cystic duct during the procedure, it flowed out and was replaced by air immediately after cSEMS placement ([Fig. 3]). The patient was discharged without complications.

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Fig. 3 Case 1. a Cholangiography revealed the orifice of the cystic duct (arrows) above the stricture. b The novel HILZO stent (ABIS Inc., Hyogo, Japan) was deployed from the common hepatic duct to the duodenum. c Contrast agent that had pooled in the cystic duct flowed out after stent placement.

Case 2: An 80-year-old woman with MDBO due to pancreatic cancer was admitted to our hospital. Cholangiography revealed the OCD at the proximal end of the biliary stricture. Initially, transpapillary gallbladder drainage was attempted to prevent stent-related cholecystitis; however, a guidewire could not be advanced into the gallbladder due to the highly angulated cystic duct. Therefore, the novel cSEMS (8 mm, 7 cm) was placed beyond the OCD. Stent deployment was successfully performed from the common hepatic duct to the duodenum ([Fig. 4]). The patient was discharged without any complications, and follow-up computed tomography showed a collapsed gallbladder compared with before cSEMS placement ([Fig. 5]).

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Fig. 4 Case 2. a Cholangiography revealed the orifice of the cystic duct at the proximal end of the biliary stricture. b The novel HILZO stent (ABIS Inc., Hyogo, Japan) was successfully placed.
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Fig. 5 Case 2: Computed tomography showed the gallbladder collapse compared with before placement of the novel HILZO stent (ABIS Inc., Hyogo, Japan). a Before stent placement. b After stent placement.

To the best of our knowledge, this is the first report of a novel HILZO stent used to prevent stent-related cholecystitis in patients with MDBO.

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Artikel online veröffentlicht:
27. März 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/).

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