Nephrostomy catheters
Ring
A flexible tube intended for percutaneous placement in the abdomen to establish a channel for temporary or prolonged drainage of an obstructed biliary tract, for splinting of the bile duct during healing, or for preventing stricture of the bile duct. It is distally inserted into the common bile duct, hepatic ducts (transhepatic biliary drainage), or gallbladder (cholecystostomy drainage); disposable devices dedicated to drain introduction may be included with the device. It may be used in conjunction with a low negative pressure system and is available in various designs (e.g., silicone Y- or T-tube, catheter-like, with perforations). This is a single-use device.
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Where to buy Ring
Contact Cook Incorporated directly; they can quote, ship, or point you to the distributor for your country.
From cookmedical.com, checked October 2026.
No reply, or outside their markets? Send us a request and we route it to a rep or distributor for your country.
Ring models and sizes
From the FDA Global Unique Device Identification Database. Confirm with the manufacturer's instructions for use.
| Model / catalog no. | Size | MRI | Status |
|---|---|---|---|
| G06728 | — | MR Conditional | Available |
| G06909 | — | MR Conditional | Available |
| G06990 | — | MR Conditional | Available |
| G10274 | — | MR Conditional | Available |
| G11956 | — | MR Conditional | Available |
| G12586 | — | MR Conditional | Available |
| G12643 | — | MR Conditional | Available |
Procedures that use nephrostomy catheters
Frequently asked questions
What is Ring used for?
A flexible tube intended for percutaneous placement in the abdomen to establish a channel for temporary or prolonged drainage of an obstructed biliary tract, for splinting of the bile duct during healing, or for preventing stricture of the bile duct. It is distally inserted into the common bile duct, hepatic ducts (transhepatic biliary drainage), or gallbladder (cholecystostomy drainage); disposable devices dedicated to drain introduction may be included with the device. It may be used in conjunction with a low negative pressure system and is available in various designs (e.g., silicone Y- or T-tube, catheter-like, with perforations). This is a single-use device.
Who makes Ring?
Ring is made by Cook Incorporated. It is listed under nephrostomy and nephroureteral catheters in our device library.
What sizes does Ring come in?
The FDA device database does not list sizes for Ring. Check the instructions for use or ask a Cook Incorporated representative.
Is Ring MRI safe?
The FDA device database lists Ring as MR Conditional. Always follow the specific MRI conditions in the labeling.
Is Ring FDA cleared?
Ring is registered in the FDA's Global Unique Device Identification Database (GUDID).
How do I contact a Cook Incorporated sales representative?
Cook Incorporated has not listed representatives on LA Vascular yet. Visit the Cook Incorporated company page for contact details.
Models, sizes and MRI status come from the FDA Global Unique Device Identification Database (GUDID); descriptions marked "provided by the manufacturer" are reviewed before publishing. Not an endorsement; follow the manufacturer's instructions for use.