24
3. Program the pump to deliver a continuous
rate of 30 ml/hr
4. Start the pump
5. Clamp the tubing halfway between the
fluid reservoir and the pump
6. The pump should alarm within three
activations after clamping the tubing
NOTE
Make sure the upstream occlusion sensor is
turned on in the Biomed Toolbox.
Accuracy Testing
Accuracy testing may be performed in
any delivery mode. This manual shows an
example of delivery accuracy testing with the
pump in the PCA delivery mode.
Gravimetric Accuracy Testing (Option 1)
Description
A CADD
™
medication cassette reservoir is
partially filled with water and weighed. The
reservoir is then attached to the pump and
the pump is set to deliver a certain amount
of water. The reservoir 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.
That is, under the test conditions described
below, the accuracy of the pump and reservoir
will be nominal with a 90% confidence level.
The nominal test conditions are as follows
degassed water at 25 ± 5°C without
back pressure.
Equipment needed
• 50‑ or 100‑ml CADD
™
medication cassette
reservoir
• 50‑ or 60‑ml syringe
• CADD
®
extension set with anti‑siphon valve
• A balance accurate to 0.1 g
• 40 ml of room temperature water
Procedure
1. Fill the 50‑ or 60‑ml syringe with 40 ml of
water. Transfer the water into a
CADD
™
medication cassette reservoir.
2. Remove any air from the CADD
™
Medication
Cassette reservoir by aspirating the air with
the syringe. Attach the CADD
®
extension set
with anti‑siphon valve. Prime the tubing so it is
filled with fluid to the end of the extension set
luer lock connector.
3. Secure the clamp as close to the extension set
luer lock connector as possible. This should
assure a minimum water loss from the tubing
when the syringe is removed.
4. Weigh the entire reservoir/extension set
assembly and record the weight. This is the
pre‑delivery weight. (This weight includes the
empty CADD
™
medication cassette reservoir,
extension set, and weight of the water.)
5. Attach the CADD
™
medication cassette
reservoir to the pump. Program the reservoir
volume to 20 ml. Now press the ENTER key.
This value is the intended delivery volume.
(One ml of water at 20°C weighs 1 gram.) Open
the clamp.
6. With the pump in Lock Level 0, program a
continuous rate of 0 ml/hr and a dose of 1.0 ml
(but do not deliver a Demand Dose). Start the
pump and deliver a clinician bolus of 20 ml.
7. Again, secure the clamp as close as possible
to the end of the extension set luer lock
connector. Remove the CADD
™
medication
cassette reservoir from the pump and weigh
the entire reservoir/extension set assembly.
This is the
postdelivery weight
.
8. Calculate the difference in weight between the
predelivery weight and the postdelivery weight.
This is the
weight of the amount delivered
.
9. Find the difference between the volume of the
amount delivered and the intended delivery
volume. This is the
inaccuracy volume
.
10. Divide the inaccuracy volume by the intended
delivery volume and multiply by 100. This is
the
accuracy error percentage
(See Table 14).
11. If the accuracy error percentage is greater
than ± 6%, repeat the test with a new reservoir.
If the pump fails a second time, call Smiths
Medical’s Customer Service Department.
Table 14. Gravimetric percentage calculation
Pre-
Post
Weight of
Intended Inaccuracy
Accuracy
Accuracy
Delivery Delivery
Amount
Delivery Volume
Error
Error Percentage
Weight
Weight
Delivered
Volume
61.1 g
41.6 g
19.5 g = 19.5 ml
20 ml
‑0.5 ml
‑0.5 ml ÷ 20.0 ml = ‑0.025 x 100 = ‑2.5%
‑0.025
