Power-injectable catheters are specifically designed to withstand the rapid infusion of contrast media during CT or MRI scans using high-flow injectors. These devices may be either port-type systems or catheter-only systems without a reservoir, such as PICCs or midlines.
As highlighted in the presentation “What Is Power Injection Today” (Sergio Bertoglio, PICC Day 2024), several key considerations are essential for safe and effective use.
No Universal Standard for Flow Parameters
One important point is that there is no universal standard for flow rates or pressure limits across all devices. Parameters such as 5 mL/sec flow or 325 psi pressure do not apply uniformly. The pressures required for a given contrast-enhanced exam depend on multiple factors: the flow rate set on the injector, the viscosity and temperature of the contrast medium, the internal diameter and length of the catheter, and the overall patency of the line without any restrictions.
Pressure Demands in Clinical Practice
In routine clinical settings, injectors are typically set with a nominal pressure threshold of around 300 psi (approximately 20.4 atm or 20.7 bar). However, actual pressures during injection may exceed 350 psi. Such high pressures are necessary because contrast media are highly viscous liquids, and achieving the required injection flows at the catheter tip demands sustained pressure loads.
For catheter-only systems like PICCs or midlines, the pressure load is mitigated by several components along the fluid path, including the extension line between the injector and the catheter, the luer hub, and the overall length of the catheter.
Clarifying Flow Rate Requirements
It is also worth noting that a flow rate of 5 mL/sec is not a mandatory requirement for power injection. Instead, for a given volume of infused fluid, the actual achievable flow rate is primarily determined by the catheter’s internal diameter and length. Therefore, focusing only on flow rate without considering these physical parameters can be misleading.
Safety Checks and Manufacturer Guidance
Before any high-flow, high-pressure examination, catheter patency must always be verified. CT and MRI injectors are programmed to trigger an alarm and lockout when pressures exceed 270–300 psi, in compliance with the 2004 FDA Warning on this issue.
Ultimately, users are strongly advised to read the device’s Instructions for Use (IFUs) to obtain the manufacturer’s specific data on tolerated pressures and flow rates. If this information is not readily available, it should be requested directly from the manufacturer. Each catheter or device has unique specifications, and most can be considered power-injectable provided that the recommended flow rate and pressure parameters are strictly followed.
What can we provide for you?
Since our inception in 2001, Beijing L&Z has been dedicated to the fields of enteral and parenteral nutrition, providing comprehensive one-stop solutions to our clients. Our current catheter offerings include 3Fr single-lumen, 4Fr single-lumen, and 5Fr dual-lumen PICCs. Furthermore, leveraging our profound expertise in the neonatal market, we are about to provide a specialized 1.9Fr single-lumen PICC designed to meet the unique needs of neonatal patients.
Post time: May-11-2026