Pumps for Human Blood Pressure Simulation - Microsurgery: Advances, Simulations, and Applications - page 221

physical properties change with temperature and dynamic low.
When the blood pressure is simulated within silicone vasculature,
every low pulse is visualized with the cross-section variation of
silicone vasculature and when the Y -connectors used as catheter
insertion ports are open, the circulating warm luid will start leaking
as blood does in a real intervention. For this purpose, we constructed
a portable luid control system that uses a magnetic drive pump with
pressure feedback for bounding maximum and minimum pressure
of pre-programmed waveforms proile. This simulator recreates a
pulsed low with frequency in the range of 50-150 bpm and with
an amplitude range of 20-65 mmHg with minimum pressure range
of 75-140 mmHg. Additionally temperature control was added to
the circulating luid to set the temperature in a range of 30-40°C
(Figs. 6.20 and 6.21).
The system operation is controlled using a microcontroller
PIC18F1320; the motion of the pump was controlled through
a PWM interface and DC motor drive, the variation of the PWM
signal is deined by the parameters set by the user and the pressure
sensor feedback. The luid is heated though a ceramic heater that
is controlled in a binary state according to the desired temperature
and the voltage level measured in a thermistor.
140mmHg
1223 ms
90mmHg
Figure 6.20 Portable system for human blood pressure simulation and
low temperature control (Left). Human pressure waveform at
50 bpm simulated using magnetic drive pump with feedback
control of pressure limits and pre-programmed wave proile
(right).