Fluid Flow Patterns Through Drainage Catheters: Clinical Observations in 99 Patients

Area of Science:

• Radiology
• Medical Devices
• Interventional Procedures

Background:

• Biliary and abdominopelvic fluid collections often require drainage using specialized catheters.
• Pigtail and biliary catheters are commonly employed for these drainage procedures.
• Understanding fluid dynamics within these catheters is crucial for optimizing drainage efficacy.

Purpose of the Study:

• To investigate and characterize fluid flow patterns through the side holes of pigtail and biliary drainage catheters.
• To determine the functional contribution of different side holes to overall catheter output.

Main Methods:

• Retrospective analysis of sinograms and cholangiograms in 99 patients undergoing biliary/abdominopelvic fluid drainage.
• Evaluation of contrast flow through 10.2-F pigtail (n=81) and biliary (n=18) catheters.
• Exclusion of cases with imaging artifacts or obscured side hole visualization.

Main Results:

• Contrast predominantly exited from the most proximal side hole in 91.9% of cases for both catheter types.
• Limited contrast flow was observed from the second (6.1%) and third (2.0%) most proximal side holes.
• No contrast egress was detected from distal side holes beyond the third most proximal.

Conclusions:

• The majority of fluid drainage occurs through the proximal side hole of pigtail and biliary catheters.
• Distal side holes contribute negligibly to total drainage, rendering the distal catheter segment potentially non-functional.
• Findings suggest potential for catheter design modification to improve drainage efficiency.