35
a
nnual
I
nsPectIon
and
t
estIng
V. Accuracy Tests
Calibration is not required in order to maintain delivery accuracy. The pump does not require the use of
stored calibration values in order to achieve or maintain delivery accuracy.
Note:
Perform either the gravimetric test or the volumetric test, but not both.
☐
Gravimetric Accuracy Testing
Description:
A CADD
™
medication cassette reservoir is partially filled with water and weighed. The cassette is
then attached to the pump, and the pump is set to deliver a certain amount of water. The cassette is
then removed and weighed again. The amount of water delivered is compared to the amount that
the pump should have delivered.
Nominal system accuracy is given in the technical specifications section for the pump. The nominal
test conditions are: degassed water at 25 ± 5°C without back pressure.
Equipment needed:
•
CADD
™
medication cassette reservoir with attached CADD
®
extension set
or
CADD
™
medication cassette reservoir with Flow Stop feature with attached CADD
®
extension set
•
50 or 60 mL syringe
•
A balance accurate to 0.1 g
•
40 mL room temperature water
Procedure:
1. Fill the syringe with 40 mL water.
2. Transfer the water into a CADD
™
medication cassette reservoir. Remove any air from the
CADD
™
medication cassette reservoir by aspirating the air with the syringe.
3. Fill the syringe with 3–5 mL water.
4. Attach the syringe to the end of the CADD® extension set that does
not
contain the anti-siphon
valve. Prime the tubing so it is filled with fluid to the end of the CADD® extension set.
5. Secure the clamp as close as possible to the distal end (anti-siphon valve end) of the CADD
®
extension set. This should assure a minimum water loss from the tubing when the syringe is
removed.
6. Remove the CADD
®
extension set from the syringe and attach it to the CADD
™
medication
cassette reservoir.
7. Weigh the entire CADD
™
medication cassette reservoir/CADD
®
extension set assembly and
record the weight. This is the
predelivery weight,
and includes the filled CADD
™
medication
cassette reservoir, and CADD® extension set.
8. Attach the CADD
™
medication cassette reservoir to the pump.
9. Program the reservoir volume to 20 mL. This value is the
intended delivery volume
. (1 mL
water at 20°C weighs 1 g.)
10. Open the clamp.
11. Program a continuous rate of 0 mL/hr and a PCA dose of 20.0 mL.
12. Start the pump and deliver a PCA dose of 20 mL.
13. Again secure the clamp as close as possible to the distal end (anti-siphon valve end) of the
CADD
®
extension set.
14. Remove the CADD
™
medication cassette reservoir from the pump and weigh the entire
CADD
™
medication cassette reservoir/CADD
®
extension set assembly. This is the
postdelivery weight
.
15. Calculate the difference in weight between the predelivery weight and the postdelivery weight.
This is the
weight of the amount delivered
.
