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Related Experiment Videos

Enlarging pediatric i.v. catheters

A Mapes1, B R Jones

  • 1Department of Anesthesiology, University of California, School of Medicine, Davis 95616-8634.

Pediatric Emergency Care
|February 1, 1994
PubMed
Summary
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The Streamline intravenous catheter, made of hydrogel, expands in saline, significantly increasing flow rates up to 43% for the 22-gauge model. This swelling effect enhances fluid delivery performance over time.

Area of Science:

  • Biomaterials Science
  • Medical Device Engineering
  • Fluid Dynamics

Background:

  • The Streamline intravenous catheter utilizes an elastomeric hydrogel (Aquavene) that responds to aqueous environments.
  • Material properties of hydrogels can influence device performance in clinical settings.

Purpose of the Study:

  • To quantify the changes in flow rate for different gauges of the Streamline intravenous catheter during hydration.
  • To assess the impact of hydrogel swelling on intravenous catheter performance.

Main Methods:

  • Three gauges of Streamline catheters (22-, 24-, and 26-gauge) were hydrated in 37°C normal saline for 90 minutes.
  • Flow rates were measured every 15 minutes by timing the passage of 10 ml of saline.
  • Ten replicate tests were conducted for each gauge at each time point.

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Main Results:

  • All tested catheter gauges demonstrated a significant increase in flow rate over the 90-minute hydration period.
  • Flow rates reached a maximum at the 75-minute mark, with increases of 43%, 39%, and 32% for 22-, 24-, and 26-gauge catheters, respectively.
  • Despite swelling, no catheter's maximum flow rate exceeded the initial flow rate of the next larger gauge.

Conclusions:

  • The elastomeric hydrogel composition of the Streamline catheter leads to increased flow rates due to hydration-induced swelling.
  • The swelling effect provides a measurable performance enhancement for intravenous fluid delivery.
  • Understanding these material-driven performance changes is crucial for optimizing catheter selection and use.