1.
Sarns 8000
a)
Advantages
i)
Power
leads accessible from front
ii)
Easy
to operate alarm status
iii)
Delayed
reversing
iv)
Clutchable
hand cranking
v)
Easy
to wheel
vi)
Can
hand crank with lids closed
vii)
Alarm
status turns off both main & cardioplegia
b)
Disadvantages
i)
Hinge
occlusion mechanism - not as secure as COBE
ii)
Bulky
iii)
Tilted
operating panels (if spill)
iv)
Clamp
trays at front
v)
Individual
collars
2.
COBE
a)
Advantages
i)
Compact
design
ii)
Easy
to operate alarm status (in standard configuration cf computer configuration)
iii)
Difficult
to wheel
b)
Disadvantages
i)
Difficult
to access power outlets
ii)
Computer
configuration - difficult to control
iii)
Non
clutchable cranking
iv)
Lids
must be open to crank
3.
Stockert
a)
Advantages
i)
Rotating
head turrets
b)
Disadvantages
i)
Difficult
to control alarms
ii)
Flat
control surface - poor spill control; items could be dropped directly on &
damage
iii)
Opaque
pump covers - difficult to see
iv)
Preloading
tubing line inserts (had to be initially removed)
4.
Gambro/Jostra
a)
Advantages
i)
Fully
computerised - down loads everything
ii)
Fully
automated everything
iii)
Runs
from transformer- not so subject to current surges [converts AC to DC]
iv)
Universal
collars
b)
Disadvantages
i)
More
complex to operate?
ii)
Unique
operating procedures - non intuited
iii)
During
failures - requires codes to be switched into manual override
iv)
Non
modular design - if base fails (or computer system) the whole system goes down
1.
Standard
Class A electrical system
2.
Connected
to heart isolated area with isolated power supply
220 V 50 Hz
|
Power Consumption |
Biomedicus |
SARNS 7000 |
SARNS 8000 |
COBE |
|
Pump Module |
1.5
amp |
1/8 hp motor |
Current
rating: 0.7 amps |
150
watts typical 280
watts max 1.5
amp circuit breaker |
|
Base |
|
|
Current
rating: 6 amps (4 pump base) |
|
|
Leakage current |
|
|
|
20
mA
Max |
|
|
|
|
|
|
Power[Watts]
= volts x amps
If
consumption given in watts can disregard voltage supplied (ie 110 vs 240]
|
|
Sarns 8000 |
|
Emergency power |
2
x 12V batteries Automatic
battery backup provides power to two pumps, all safety systems and
accessories for 25 minutes Switchover
from main power to battery backup is automatic & immediate, providing
uninterrupted power supply Battery
unit is built into the power base Can
be recharged automatically when connected to AC current |
|
Power supply |
Protected
power cords from spills but easily accessible Fully
loaded current rating of 6 amps for 4 pump base |
|
Lighting |
High
intensity low voltage quartz lamp Goose
neck Power
to the lamp is uninterrupted if have an installed battery module |
|
IV poles &
accessories |
Sturdy
poles make it easy to mount monitors & additional equipment Adjustable
height Shelving Stopwatches (additional
for Cobe) |
|
Design |
Solid
stainless steel base |
|
Alarms |
Ergonomically
positioned See question relating
to positioning of various equipment on pump |
1.
Battery
systems
a)
Incorporated
in console (pump base)
i)
Can
allocate power to eg pump 1 & pump $ & level detection
ii)
year
life
b)
Separate
unit
i)
Supplies
whole pump
c)
Hospital
generator should cut over in 5 seconds (as are working in A area - gets
priority)
1.
ECMO
a)
Single
pump
b)
Pillow
alarm system option
i)
If
decreased venous return will collapse thereby stopping pump flow [servo
control]
ii)
Not
necessary in adults as may have a soft shell reservoir
c)
Soft
shell venous reservoir option
2.
Adults
a)
4
– 5 pump heads
3.
Pediatrics
a)
Smaller
sweep stroke pump heads
i)
To
reduce stroke volume
ii)
As
only need to pump small volumes per minute
iii)
Allows
greater control of pump speeds
b)
Finer
resolution pump speed control mechanisms
c)
?
Venous return clamp mechanisms
|
|
SARNS 7000 |
SARNS 8000 |
COBE |
|
Design |
Double-roller
peristaltic pump |
Microprocessor
controlled Double-roller peristaltic pump |
Double-roller
peristaltic pump |
|
Maximum revs &
swept stroke |
5
- 250 RPM |
1
- 250 RPM |
1
- 250 RPM |
|
Occlusion mechanism
& tubing collets (collars) |
Single
control occlusion setting; individual tube clamp mechanisms Whole
collar mechanism completely surrounds tubing Too narrow a collar
-pinch tubing & increase haemolysis 2° turbulence; too large a collar -
tubing can walk via pump head |
Single
control occlusion setting; individual tube clamp mechanisms Whole
collar mechanism completely surrounds tubing |
Occlusion
thumbwheel moves both tubing rollers out or inwards in unison; universal
tubing clamp adjustment knobs Collar
mechanism; only half holds tubings & inset easy to fall out - partial
distortion of tubing seen |
|
Rev counters &
flow indicators |
Numeric
display of roller assembly speed (RPM) {via strobe timing mechanism} and
computed flow rates (L/min) based on RPM & size of tubing used in pump
head |
Multiple
checks of pump speed include optical tachometer that measures pump speed
directly from the drive shaft; alerts regarding overspeed, tachometer loss,
pump jam, belt slip |
Flow
via rpm rpm
can change with malalignment etc - possibility of inaccurate flow
measurements |
|
Indicators of ‘running
hours’ |
Located
behind used for maintenance
& pump rotation |
Located
underneath |
Located
on back panel - indicates total hours pump has been on |
|
Pulsatile & non
pulsatile |
Extra
module required |
Extra
module required |
Extra
module required |
|
Ventricular support |
Require
reservoir (not required with vortex pump) as danger of sucking in air |
||
|
Manual crank mechanism |
Non
reversing (counter-clockwise only via a one way clutch) handcrank mounted on
a storage bracket at the rear of the pump {first switch pump off} Can
be cranked with lids closed ( but if power goes back on - will have crank
pulled out off hand) |
Hand
crank inserted into either one of the two rollers; no direction limiting
device Require
lid to be open |
|
|
Effective working life |
Expect
approx 10 years |
||
|
|
SARNS 7000 |
SARNS 8000 |
COBE |
|
Resettable fuses |
Button
that pops out near power inlet |
Circuit
breaker in front control panel |
Circuit
breaker located on back panel - to protect against electrical overload 1.5
Amps @ 240 V |
|
Slave control of pump
by pressure & low level alarm |
Nothing |
Alert
mode - begins to slow; Stops on alarm - must be manually activated |
Remote
Control Knob: allows pump to respond to pressure limits or another blood pump
(master/slave); not affected by AEPS input |
|
Runaway control alarms
& protection |
Motor
control overspeed detection circuit |
Includes
3 overspeed detection conditions controlled by pump electronics, pump
microprocessor |
Runaway
protection circuit which monitors actual pump motor speed in relation to the
SPEED control setting. If an overspeed condition is detected, the rotation of
the pump head is stopped |
|
Overcurrent (pump jam) |
Present
- but higher threshold than 8000 |
Within
1 sec of motor current exceeding 8 amp, the pump stops & displays “pump
jam” |
Present
- but higher threshold than 8000 |
|
Pump direction safety
switches |
To
reverse pump: press stop switch; lift reverse switch cover, press & hold
switch; release reverse switch; operate speed control |
Intentional
controls require that dual forward, reverse & computer switches be pushed
simultaneously to ensure deliberate activation |
Two
stage safety interlock switch |
|
Safety pump covers |
Simple
perspex cover |
Cover
interlock prevents spills into pump head & pump jams as pump only
operates when cover is closed |
Perspex
cover activates cover switch - lifting of cover stopes pump head |
|
|
SARNS 7000 |
SARNS 8000 |
COBE |
|
Tubing occlusion
Adjustment |
Prior
to every case |
|
Prior
to every case |
|
Flow rate Calibration |
|
|
Every
500 hours or whenever tubing type is changed or occlusion adjusted |
|
Pump rotation |
|
|
Every
500 hours To
maintain even wear on all pumps in a system (especially arterial pump) |
|
General pump
operations |
Run
pump from 0 - 250 RPM in forward & reverse while observing for roller
assembly rotating smoothly and evenly with no unusual noises |
|
|
|
Overspeed detection |
Handcrank
pump head while in a forward mode but at initially zero RPM (ie speed
controller max anticlockwise) up to 100 RPM - after a few seconds ‘forward’
should go out & ‘stop’ should glow |
|
Every
100 hours With
pump ON; set to 2 RPM; manually rapidly rotate roller with hand crank while
depressing cover switch; digital display should flash and pump head should
stop rotating after release of handcrank |
|
Drive belt tension |
Check
twice a year |
|
|
|
Lubrication |
Tube
guide rollers every month Occlusion
knob every month |
|
|
|
Cable check |
|
|
Every
250 hours Check
for condition of cables |
|
Fan Guard check |
|
|
Every
250 hours |
|
Leakage current |
|
|
|
|
Alarm checks |
|
|
|
1.
Do
Not use acetone based cleaning solutions
2.
Clean
exterior of blood pump after each use
3.
Wipe
with damp cloth
4.
Acceptable
solutions:
a)
Water
b)
Mild
detergents
c)
Dilute
solutions of sodium hypochlorite
5.
Keep
cleaning solutions out of electrical receptacles on the pump rear panel
6.
Clean
fluid spills into pump head immediately
7.
Large
volume spills require inspection of internal components by technician