A novel tapered plastic stent with an ultrafine delivery system for one-step endoscopic ultrasound-guided hepaticogastrostomy

A 76-year-old woman was admitted to our hospital with obstructive jaundice due to pancreas head cancer ([Fig. 1]). Endoscopic transpapillary biliary drainage was attempted but was unsuccessful owing to duodenal invasion. We therefore tried one-step endoscopic ultrasound-guided hepaticogastrostomy (EUS-HGS) using a novel stent system (Crane stent; SB-Kawasumi, Kanagawa, Japan). The stent system comprises a straight-type, 7-Fr, plastic stent with a tapered tip of 4.7 Fr, an inner catheter with an extremely fine 2.5-Fr tip designed for use with a 0.025-inch guidewire, and a pusher connected to the stent allowing it to be pulled back ([Fig. 2]). A stent with a length of 15 cm between the flaps was selected.

Fig. 1 Contrast-enhanced computed tomography showing: a dilated intrahepatic bile ducts; b pancreas head cancer (_*) invading the second part of the duodenum (†).

Fig. 2 A novel stent system (Crane stent; SB-Kawasumi, Kanagawa, Japan), which comprises a straight-type, 7-Fr, plastic stent with a 4.7-Fr tip, an inner catheter with a 2.5-Fr tip designed for use with a 0.025-inch guidewire, and a pusher connected to the stent. Inset: Image showing a 0.025-inch guidewire threaded through the delivery system. Source: SB-Kawasumi.

After puncturing B2 with a 19-gauge needle through the stomach, bile was aspirated as much as possible to reduce bile leakage. Following injection of a small amount of contrast, a 0.025-inch guidewire was inserted into the bile duct and the stent system was inserted over the guidewire without fistula dilation ([Video 1]). Finally, the stent was released in the stomach. The time from puncture to stent placement was 5 minutes. The post-procedure course was uneventful.

Video 1 One-step endoscopic ultrasound-guided hepaticogastrostomy with a novel, tapered, plastic stent with an ultrafine delivery system.

One-step EUS-HGS with a covered metal stent stowed in a thin delivery system has recently been reported to shorten procedure time and reduce bile leakage [1] [2]. Although the Crane stent is a plastic stent that cannot be stowed thinly, one-step stenting was possible by minimizing the gap between the guidewire and inner catheter, and between the inner catheter and stent ([Fig. 3]). The advantage of plastic stents is easy implantation [3], but bile leakage is more likely to occur than with covered metal stents [4]. However, as previously reported [5], bile leakage could be prevented even with plastic stents by aspirating bile sufficiently before stent insertion.

Fig. 3 The novel stent system (Crane stent; SB-Kawasumi, Kanagawa, Japan) compared with other devices with a 0.025-inch guidewire threaded. a A conventional endoscopic retrograde cholangiopancreatography catheter (01 20 21 1; MTW Endoskopie, Düsseldorf, Germany). b A 7-Fr plastic stent (Flexima Plus; Boston Scientific Japan, Tokyo, Japan). c A 7-Fr plastic stent (Through & Pass TYPE IT; Gadelius Medical, Tokyo, Japan). d A 7-Fr plastic stent (SUZAKU; Kaneka Medix, Osaka, Japan). With the exception of the SUZAKU stent, which was also designed for a 0.025-inch guidewire, the gap between the tip of the devices and guidewire is larger than for the Crane stent. Additionally, the Crane stent is tapered more than the other stents and has the smallest gap with the inner catheter.

This novel plastic stent system has the potential to make EUS-HGS easier, faster, and safer. Further investigations in a large cohort are warranted.

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Publikationsverlauf

Artikel online veröffentlicht:
16. Januar 2023

• References

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