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Pacemaker.py
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Pacemaker.py
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from time import time
from heart_activity import POLARIZED, DEPOLARIZING, REFRACTORY, REPOLARIZING, FIBRILLATION, AFIB
class ModeSwitching:
def __init__(self, heart):
self.heart = heart
self.sys = HardwareSystem(heart)
self.VVI = VVI(self.sys)
self.VDD = VDD(self.sys)
self.time_of_last_AFib = 0
self.AFib_Check_Period = 2000
self.Mode = ''
def check_for_AFib(self):
if self.heart.rhythm.A_state == AFIB:
self.time_of_last_AFib = time()
def recent_AFib(self):
if (time() - self.time_of_last_AFib) * 1000 <= self.AFib_Check_Period:
return True
else:
return False
def run(self):
# Determine which state it's in
self.check_for_AFib()
if self.recent_AFib():
self.Mode = 'VVI'
self.VVI.run()
else:
self.VDD.run()
self.Mode = 'VDD'
return self.sys.IO_PaceActive
PACE = 0
VB = 1
VRP = 2
LRLONLY = 3
LRLANDPSYNC = 4
class VVI:
'''VVI and VDD classes store the logic within the state diagram, and when to switch around'''
def __init__(self, hardwareSystem=None):
self.pState = VB
if hardwareSystem is not None:
self.sys = hardwareSystem
else:
self.sys = HardwareSystem()
self.sys.setVBTimer()
self.pastState = VB
self.Mode = 'VVI'
### In this case, run() acts the same as the while loop in the example C code
### because run() runs on every frame
def run(self):
if self.pState != self.pastState:
self.pastState = self.pState
print(self.pState)
if self.pState == PACE:
self.processPaceState()
elif self.pState == VB:
self.processVBState()
elif self.pState == VRP:
self.processVRPState()
elif self.pState == LRLONLY:
self.processLRLOnlyState()
else:
raise Exception("Invalid State")
return self.sys.IO_PaceActive
def processPaceState(self):
if not self.sys.VPaceTimerActive:
self.sys.VPaceOn()
self.sys.setVPaceTimer()
return
if self.sys.VPaceTimer_expired():
self.sys.VPaceOff()
self.sys.clearVPaceTimer()
self.pState = VB
return
return
def processVBState(self):
if not self.sys.VBTimerActive:
self.sys.setVBTimer()
return
if self.sys.VBTimer_expired():
self.sys.clearVBTimer()
self.pState = VRP
return
return
def processVRPState(self):
if not self.sys.VRPTimerActive:
self.sys.setVRPTimer()
return
if self.sys.VRPTimer_expired():
self.sys.clearVRPTimer()
self.pState = LRLONLY
# self.sys.setLRLTimer()
return
return
def processLRLOnlyState(self):
if self.sys.LRL_timer_expired():
self.sys.clearLRLTimer()
self.sys.setLRLTimer()
self.pState = PACE
return
if self.sys.Ventricular_Sensed():
self.sys.clearLRLTimer()
self.sys.setLRLTimer()
self.pState = VB
return
return
class VDD(VVI):
def __init__(self, hardwareSystem=None):
self.pState = VB
if hardwareSystem is not None:
self.sys = hardwareSystem
else:
self.sys = HardwareSystem()
self.sys.setVBTimer()
self.pastState = VB
self.Mode='VDD'
def run(self):
if self.pState != self.pastState:
self.pastState = self.pState
print(self.pState)
if self.pState == PACE:
self.processPaceState()
return
elif self.pState == VB:
self.processVBState()
return
elif self.pState == VRP:
self.processVRPState()
return
elif self.pState == LRLONLY:
self.processLRLandPSyncState()
return
else:
raise Exception("Invalid State")
def processLRLandPSyncState(self):
self.processLRLOnlyState()
# If pacing due to LRL, skip the P Sync step
if self.pState == PACE:
self.sys.clearAVITimer()
return
self.processPSyncState()
def processPSyncState(self):
if self.sys.Atrial_Sensed() and not self.sys.AVITimerActive:
self.sys.setAVITimer()
if self.sys.AVITimerExpired():
self.sys.clearAVITimer()
self.sys.clearLRLTimer()
self.sys.setLRLTimer()
print("AVI Timer Expired")
self.pState = PACE
if self.sys.Ventricular_Sensed():
self.sys.clearAVITimer() # processLRLOnlyState() will take care of the LRL timer
self.pState = VB
return
class HardwareSystem():
'''Class that represents the physical systems and hardware of the pacemaker device
If the pacing mode program is the software, this is the firmware/hardware/OS
The pacing mode classes (VVI and VDD) store the logic for the state diagram, this class
handles the steps that occur in each state'''
def __init__(self, heart):
# Save "Heart" object for IO
self.heart=heart
# Pacing voltage (in millivots)
self.pacing_voltage = 0.5
# Initialize parameters about the IO and interval timings
self.LRLInt = 1000
self.VPaceInt = 10
self.VBInt = 100
self.VRPInt = 200
self.AVIInt = 200
self.PVARP_Int = 250 # Post-ventricular atrial refractory period
self.IO_VSensorActive = True
self.IO_ASensorActive = True
self.IO_PaceActive = False
self.LRLTimerActive = False
self.AVITimerActive = False
self.LRLTimerEndValue = None
self.VPaceTimerEndValue = None
self.VBTimerEndValue = None
self.VRPTimerEndValue = None
self.VPaceTimerActive = False
self.VBTimerActive = False
self.VRPTimerActive = False
def current_time(self):
'''Function that represents the hardware's onboard timing circuitry'''
return time()*1000
##### LRL Functions: #####
def LRL_timer_expired(self):
if self.LRLTimerActive and self.current_time() >= self.LRLTimerEndValue:
return True
else:
return False
def clearLRLTimer(self):
self.LRLTimerActive = False
def setLRLTimer(self):
print('LRL Timer Set')
self.LRLTimerActive = True
self.LRLTimerEndValue = self.current_time() + self.LRLInt
##### Atrioventricular Interval Functions (p wave sync): #####
def AVITimerExpired(self):
if self.AVITimerActive and self.current_time() >= self.AVITimerEndValue:
return True
else:
return False
def clearAVITimer(self):
self.AVITimerActive = False
def setAVITimer(self):
self.AVITimerActive = True
self.AVITimerEndValue = self.current_time() + self.AVIInt
##### Sensing Functions: #####
def Ventricular_Sensed(self):
# First, make sure IO Ventricular Sensor is on
if self.IO_VSensorActive:
if self.heart.rhythm.V_state == DEPOLARIZING:
return True
else:
return False
def Atrial_Sensed(self):
# First, make sure IO Atrial Sensor is on
if self.IO_ASensorActive:
if self.heart.rhythm.A_state == DEPOLARIZING:
return True
else:
return False
##### VPace Functions #####
def VPaceOn(self):
self.IO_ASensorActive = False
self.IO_VSensorActive = False
self.IO_PaceActive = True
def VPaceOff(self):
self.IO_PaceActive = False
def setVPaceTimer(self):
self.VPaceTimerActive = True
self.VPaceTimerEndValue = self.current_time() + self.VPaceInt
def VPaceTimer_expired(self):
if self.VPaceTimerActive and self.current_time() >= self.VPaceTimerEndValue:
return True
else:
return False
def clearVPaceTimer(self):
self.VPaceTimerActive = False
##### VB Functions: #####
def setVBTimer(self):
self.VBTimerActive = True
self.IO_VSensorActive = False
self.VBTimerEndValue = self.current_time() + self.VBInt
def clearVBTimer(self):
self.VBTimerActive = False
self.IO_VSensorActive = True
self.IO_ASensorActive = True
def VBTimer_expired(self):
if self.VBTimerActive and self.current_time() >= self.VBTimerEndValue:
return True
else:
return False
##### VRP Functions #####
def setVRPTimer(self):
self.VRPTimerActive = True
self.VRPTimerEndValue = self.current_time() + self.VRPInt
def clearVRPTimer(self):
self.VRPTimerActive = False
def VRPTimer_expired(self):
if self.VRPTimerActive and self.current_time() >= self.VRPTimerEndValue:
return True
else:
return False
if __name__ == '__main__':
from heart_activity import Heart
heart = Heart()