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Epidural multiorifice catheters function as single-orifice catheters: an in vitro study
Allison J Fegley1, Jerrold Lerman, Richard Wissler
1Strong Memorial Hospital, University of Rochester, Rochester, New York, USA.
Anesthesia and Analgesia
|August 21, 2008
Summary
Multiorifice catheters function as single-orifice devices at low infusion rates. Higher rates and manual injections activate multiple orifices, impacting catheter pressure and function.
Area of Science:
- Medical Devices
- Fluid Dynamics
- Catheter Technology
Background:
- Multiorifice catheters are designed for precise fluid delivery.
- Understanding orifice activation is crucial for safe and effective use.
Purpose of the Study:
- To determine the flow rates activating selective orifices in 20-gauge multiorifice catheters.
- To compare catheter pressures between different multiorifice catheter brands.
Main Methods:
- In vitro saline infusion through Portex and Braun 20-gauge multiorifice catheters.
- Utilized Baxter, Abbott Laboratories, and Alaris infusion pumps.
- Recorded orifice activation and catheter pressure at varying infusion rates (1-360 mL/h) and during manual injection.
Main Results:
- Infusion rates below 80 mL/h activated one orifice.
- Rates between 100-280 mL/h activated two orifices.
- Rates above 300 mL/h activated three orifices.
- Braun catheters exhibited 40% greater pressure than Portex catheters.
- Manual injections consistently activated all three orifices.
Conclusions:
- Twenty-gauge multiorifice catheters behave as single-orifice catheters at clinically relevant continuous infusion rates.
- Multiorifice catheters function as intended during manual bolus injections.
- Catheter brand significantly influences internal pressure dynamics.
