Index: simulator/plugins/heparin/loader.py
===================================================================
diff -u -rf4523ffcaff0d27f7392c943f0a487fcb01a7d34 -r967521dff94783ce48b50abc8db6bcd67bb501bf
--- simulator/plugins/heparin/loader.py	(.../loader.py)	(revision f4523ffcaff0d27f7392c943f0a487fcb01a7d34)
+++ simulator/plugins/heparin/loader.py	(.../loader.py)	(revision 967521dff94783ce48b50abc8db6bcd67bb501bf)
@@ -9,7 +9,8 @@
 # parent
 from simulator.dynamicloader import DynamicLoader
 # hd Simulator
-from dialin.ui.hd_simulator import HDSimulator, TXStates
+from simulator.interface import SimulationInterface
+from dialin.ui.hd_simulator import TXStates
 # plugin specific
 # -- None --
 
@@ -28,9 +29,8 @@
 
     requested_state: TXStates
 
-    def __init__(self, hd_simulator: HDSimulator):
-        super().__init__(os.path.dirname(__file__), hd_simulator)
-        print(" ---------- ", self.hd_simulator)
+    def __init__(self, interface: SimulationInterface):
+        super().__init__(os.path.dirname(__file__), interface)
         self.requested_state = TXStates.HEPARIN_STATE_PAUSED
 
     def _init_loader(self):
@@ -77,7 +77,7 @@
         else:
             self.requested_state = TXStates.HEPARIN_STATE_DISPENSING
 
-        self.hd_simulator.cmd_set_heparin_pause_resume_response(True, 0, self.requested_state)
+        self.interface.hd.cmd_set_heparin_pause_resume_response(True, 0, self.requested_state)
         self.lblAction.setText('Accepted ')
 
     @Slot()
@@ -87,7 +87,7 @@
         :return: none
         """
         reason = self.spnRejectReason.value()
-        self.hd_simulator.cmd_set_heparin_pause_resume_response(False, reason, self.requested_state)
+        self.interface.hd.cmd_set_heparin_pause_resume_response(False, reason, self.requested_state)
         self.lblAction.setText('Rejected ' + "{}".format(reason))
 
     @Slot()
@@ -98,5 +98,5 @@
         :return: none
         """
         volume = value * 0.1
-        self.hd_simulator.cmd_set_treatment_heparin_data(volume)
+        self.interface.hd.cmd_set_treatment_heparin_data(volume)
         self.lblCumulative.setNum(volume)