Chapter 31 of 62
Bridge | MedSource IV Catheter Product Training
IV Catheter 101 — Fundamentals
This module provides a foundational understanding of peripheral IV catheter technology. IV catheters are among the most commonly used medical devices worldwide, yet significant knowledge gaps persist regarding their design, safety features, and proper usage.
A peripheral IV catheter consists of several key components: the catheter hub, the flexible catheter tube (cannula), the introducer needle with bevel, a flash chamber for blood visualization, and — in modern safety catheters — an integrated needlestick prevention mechanism.
Catheter gauge sizes range from 14G (largest, for trauma and rapid fluid resuscitation) to 26G (smallest, for neonatal and pediatric use). The most common sizes used in outpatient and wellness settings are 20G (general purpose), 22G (smaller veins and elderly patients), and 24G (pediatric and fragile veins).
The catheter material — typically FEP (fluorinated ethylene propylene) or polyurethane — determines flexibility, kink resistance, and biocompatibility. Bridge IV catheters, manufactured by MedSource Labs, use advanced polymer formulations optimized for patient comfort and extended dwell time.
Understanding flow rates is essential: a 20G catheter delivers approximately 60 mL/min, a 22G approximately 36 mL/min, and a 24G approximately 22 mL/min. These rates directly impact your infusion time calculations and patient throughput.
Key Points
- Modern IV catheters integrate safety mechanisms to prevent needlestick injuries
- Gauge selection depends on infusion type, vein size, patient age, and solution viscosity
- Catheter material affects flexibility, biocompatibility, and dwell time
- Flow rate is determined by catheter gauge — larger gauge means faster flow
- Bridge | MedSource IV catheters are engineered for outpatient, wellness, and in-home settings