Installation Instructions Part 1

Implantable Insulin Pump
15
The Medication Reservoir stores approximately 15 ml or 6,000 units of
a special U-400 insulin. Depending on an individual’s insulin require-
ments, the medication reservoir is refilled once in approximately every
two to three months. The medication reservoir is maintained at a negative
pressure (vacuum) at all times to allow for safe and reliable filling. This
vacuum prevents any risk of insulin leakage in the event of a breach in the
Pump case or reservoir. The reservoir is refilled with a special needle
(MiniMed Refill Needle MMT-4102). The fill port has a 20 micron filter
to prevent particulate material from entering the Pump and a redundant
septum and valve configuration to prevent entry of body fluids.
The Pumping Mechanism is a solenoid-operated, hermetically-welded
pulsatile system. The pumping mechanism is designed to seal automati-
cally to prevent leakage both into and out of the reservoir under physio-
logic temperatures and pressures. The mechanism is designed to provide
an insulin delivery accuracy of +
10% from its labeled stroke volume.
Individual Pumps are calibrated to one of seventeen different stroke vol-
umes, ranging from 0.42 µL to 0.58 µL per stroke, in increments of
0.01 µL.
The Microelectronics act as the brain of the Pump. The microelectronics
contain two microprocessors which monitor and control all pump-stroke
activity. All commands delivered from the PPC via RF telemetry to the
Pump are then acknowledged back at the PPC. The Pump has a large
memory which stores Pump specifications and programming history.
The Antenna receives radiowaves from the PPC and delivers PPC pro-
gramming commands to the Pump microelectronics.
The Battery is a custom-made lithium carbon mono-fluoride power cell,
which supplies energy to the pumping mechanism and microelectronics.
It is similar to batteries used in pacemakers and is designed to provide 6 to
10 years of service, depending on the infusion rate (refer to pump specifi-
cations).
The Tone Transducer emits beeps to indicate certain alarm conditions.
These beeps are designed to be audible through the skin and can be set
with the PPC to one of two volumes. The Pump can also be programmed
to emit beeps that signal a programmed change in the medication delivery
rate.
Dmp9196021-011_c.book Page 15 Thursday, April 4, 2002 8:15 AM