Flow controlled blood pump system
First Claim
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1. A system for pumping blood comprising:
- a) a rotodynamic pump including;
i) a housing defining a chamber and an inlet and outlet in fluid communication with the chamber; and
ii) an impeller disposed within the chamber for urging fluid from the inlet toward the outlet;
iii) the pump having a performance curve at a nominal operating speed of the pump, the performance curve relating changes in the pressure differential across the pump to changes in flow through the pump;
b) a driver for imparting rotational motion to the impeller;
c) a power supply for supplying power to the driver;
d) a regulator for regulating the power supplied from the power supply to the driver;
e) flow limiting characteristics that maintain the flow through the pump within predefined limits throughout a wide range of pressure differentials across the pump, wherein the pump further comprises an axial extension connected to the housing having a conical tip and wherein the impeller comprises a plurality of blades configured to accommodate the conical tip.
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Abstract
A system for pumping blood to assist or assume the cardiac function of a patient is characterized by a blood pump that exhibits a steep performance curve such that only small changes in pump flow occur for large changes in differential pressure across the pump. The pump therefore exhibits flow-limiting characteristics to protect the physiological system against harmful flow rates or pressures. Pump flow may also be limited by controlling the current provided to a driver from a power supply or by suitable restrictions within or external to the pump housing.
57 Citations
14 Claims
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1. A system for pumping blood comprising:
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a) a rotodynamic pump including; i) a housing defining a chamber and an inlet and outlet in fluid communication with the chamber; and ii) an impeller disposed within the chamber for urging fluid from the inlet toward the outlet; iii) the pump having a performance curve at a nominal operating speed of the pump, the performance curve relating changes in the pressure differential across the pump to changes in flow through the pump; b) a driver for imparting rotational motion to the impeller; c) a power supply for supplying power to the driver; d) a regulator for regulating the power supplied from the power supply to the driver; e) flow limiting characteristics that maintain the flow through the pump within predefined limits throughout a wide range of pressure differentials across the pump, wherein the pump further comprises an axial extension connected to the housing having a conical tip and wherein the impeller comprises a plurality of blades configured to accommodate the conical tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for pumping blood comprising:
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a) a rotodynamic pump including; i) a housing defining a chamber and an inlet and outlet in fluid communication with the chamber; and ii) an impeller disposed within the chamber for urging fluid from the inlet toward the outlet; iii) the pump having a performance curve at a nominal operating speed of the pump relating changes in the pressure differential across the pump to changes in flow through the pump, wherein the performance curve of the pump exhibits a change in flow of no more than 1 liter-per-minute for a change in pressure of 50 mm-Hg between the pump inlet and pump outlet; b) a driver for imparting rotational motion to the impeller c) a power supply for supplying power to the driver; d) a regulator for regulating the power supplied from the power supply to the driver; e) flow limiting characteristics that maintain the flow through the pump within predefined limits throughout a wide range of pressure differentials across the pump; f) means to vary the pump output performance curve, wherein the means to vary the pump output performance curve comprises a digital computer executing an algorithm that controls a set point according to measurement of pump input rpm, motor current, motor power, or a combination thereof; and wherein the pump further comprises an axial extension connected to the housing having a conical tip and wherein the impeller comprises a plurality of blades configured to accommodate the conical tip. - View Dependent Claims (11, 12, 13, 14)
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Specification