System Fluid Performance; Factors Affecting Flow Rates; Maximum Flow Rate Performance - Bayer HealthCare MEDRAD Stellant Operation Manual

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MEDRAD Stellant CT Injection System with Certegra

17.7 System Fluid Performance

The performance of the injection system has been tested with disposables supplied by Bayer with a
pressure rating greater than 325 psi (2241 kPa) and the catheters in Table 17 - 2.

17.7.1 Factors Affecting Flow Rates

An injector's ability to generate pressure is only one factor affecting maximum flow rates. Other factors
include:
If problems are experienced achieving the desired flow rate, please contact a Clinical representative for
suggestions that may increase it.

17.7.2 Maximum Flow Rate Performance

Maximum flow rates were achieved using the following catheters, with inner diameters (ID) and
lengths as noted. Contrast was heated to 37° C ± 1° C. System programmable pressure limit of 325
psi (2241 kPa) was used for testing.
NOTE: Individual results may vary. Maximum flow rate performance results were met using the
Table 17 - 2: Steady State Maximum Flow Rate Using 60-inch LPCT from Bayer
18 Gauge
Fluid
ID: 0.876 mm – 0.978 mm
Length: 2.95 cm (1.16 in.)
Ultravist 300 8.5 mL/s
Ultravist 370 8.5 mL/s
0.9% Saline 8.5 mL/s
17 - 88
• Injection monitoring is performed in the injector head to detect over rate or over volume con-
ditions due to system faults. The delivered volume is also monitored against the total pro-
grammed volume for the injection.
• When a fault condition, hold or stop is detected, the injection will stop within 5 mL.
• Once the system has disarmed, a tone sounds and a stall message displays on the display
screen.
• Catheter diameter
• Viscosity (thickness) of the fluid
• Tube length
• Number of tubing sections
• Tube diameter
• Temperature of the fluid, tube, and syringes during the injection
• Maximum pressure setting on the injector
components and conditions described in this section. Different components and/or conditions
may lead to different results.
20 Gauge
ID: 0.800 mm
Length: 2.54 cm (1.00 in.)
7.0 mL/s
7.0 mL/s
7.0 mL/s
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Workstation
Catheter
22 Gauge
ID: 0.546 mm – 0.648 mm
Length: 2.54 cm (1.00 in.)
6.0 mL/s
5.0 mL/s
6.0 mL/s
24 Gauge
ID: 0.445 mm – 0.521 mm
Length: 1.91 cm (0.75 in.)
4.0 mL/s
3.0 mL/s
4.0 mL/s