Model Prof. Dr. U. Will

Ring Knife

The ring knife has been developed to provide access to the target lesion using RF current in connection with an endosonographic intervention. The ring knife set consists of a ring knife with pushed and connected pusher and a preloaded 3-flap straight endoprosthesis. After creating access to the target lesion, the endoprosthesis can be placed for drainage without changing instruments.

Example of Use

Ring knife for EUS-guided internal bile duct and pancreatic duct drainage

Figure 4

Jaundice caused by local recurrence of gastric cancer:

1. Transjejunal EUS-puncture of the biliary tract
2. The ring knife is pushed into the common biliary duct

Figure 5

X-ray control of the ring knife feed:

1. Good visibility of the knife
2. Widening of the tumor stenosis by ring knife

Figure 6

Transjejunal-transhepatic insertion of a covered metal stent. Bridging of the tumor stenosis of the bile duct and restorati-on of the orthograde drainage.

Example of Use

Ring knife for the therapy of pseudocysts

Figure 1

After EUS-FNA of a pseudocyst, the ring knife is positioned above the lying guide wire and a cystostomy is performed.

Figure 2

Figure 3

After the cystostomy a drainage is introduced via the ring knife support system during the same session.