Blood pump device and method of producing

Abstract

A pumping system for blood for a patient includes a sensorless pump having no sensors disposed in the pump itself for moving the blood, a motor and a blood transport port through which blood is received from the patient and is pumped into the patient. The system also includes a controller connected to the pump for controlling the pump so a desired flow rate of blood can be maintained by the pump.

1 . A pumping system for blood for a patient comprising:
 a sensorless pump having no sensors disposed in the pump itself for moving the blood, a motor and a blood transport port through which blood is received from the patient and is pumped into the patient; and   a controller connected to the pump for controlling the pump so a desired flow rate of blood can be maintained by the pump.   
   
   
       2 . A system as described in  claim 1  wherein the pump has back EMF and wherein the controller includes a back EMF sampler which senses the pump speed from the pump's back EMF. 
   
   
       3 . A system as described in  claim 2  wherein the pump includes a rotor and the sampler senses the speed of the rotor. 
   
   
       4 . A system as described in  claim 3  wherein the controller includes an interrogator which sends an error correction signal corresponding to a difference between a speed control setpoint signal and the sensed pump speed to the pump to maintain the desired flow rate of the pump. 
   
   
       5 . A system as described in  claim 4  including a cannulae connected to the port. 
   
   
       6 . A system as described in  claim 5  including a coating material covering a junction between inner surfaces of the port and cannulae so that a smooth transition surface is formed so blood can flow smoothly therefrom and collection areas for the blood are eliminated.