Bloom pump system
First Claim
1. A blood pump system comprising:
- a roller pump for pumping blood through a flexible tube;
a low voltage D.C. motor having an output shaft;
an electrical control circuit for applying necessary voltage for driving said motor at a predetermined speed;
gearing means connecting the output shaft of said motor to drive said roller pump;
means coupled to said motor for controlling the speed of said motor;
means connected to said coupled means for determining the blood flow rate being pumped through the tube by said pump;
means for visually displaying a digital readout of said flow rate;
wherein said roller pump includes;
an arcuate bearing surface defining an arc of approximately 168°
adapted to carry a flexible tube through which blood may pass;
a pair of 180°
spaced apart, pivotally mounted rollers whose axes travel along a circular path concentric with said bearing surface whereby said rollers occlude the tube so as to allow blood to be pumped therethrough;
means connected to said gearing means for rotating said rollers around said circular path; and
lead ramps extending from each end of said bearing surface, each of said ramps extending substantially tangent to the end of said surface from which said respective ramp extends, said 168°
arc and said tangent ramps providing the optimal torque peak reduction for said motor to drive said pump and the optimal graduated change in cross section of the bore of the tube as each of said rollers approach and recede from the points of occlusion of the tube.
1 Assignment
0 Petitions
Accused Products
Abstract
A blood pump system in which a roller pump is provided for pumping blood through a flexible tube. A low voltage D.C. motor is provided having an output shaft. An electrical control circuit is connected to the motor for applying the necessary voltage to drive the motor at a predetermined speed. Gearing means are provided connecting the motor'"'"'s output shaft to drive the roller pump. Means are optically coupled to the motor for controlling the speed of the motor. Means are connected to the optically coupled means to determine the blood flow rate being pumped through the tube by the pump. Means are provided which display a digital readout of the flow rate. The roller pump is provided with an arcuate bearing surface, which carries the flexible tube, the bearing surface defining an arc of approximately 168°. Lead ramps extend from each end of the bearing surface and are substantially tangent to the end of the surface from which the respective ramp extends. Means are provided for allowing a variable rate of independently adjusting the radial deflection of each of the rollers of the roller pump. The system is also provided with isolation means for reducing leakage current and thus lowering the potential shock hazard to the patient from A.C. line voltage. Motor runaway and overspeed protection are also provided.
88 Citations
27 Claims
-
1. A blood pump system comprising:
-
a roller pump for pumping blood through a flexible tube; a low voltage D.C. motor having an output shaft; an electrical control circuit for applying necessary voltage for driving said motor at a predetermined speed; gearing means connecting the output shaft of said motor to drive said roller pump; means coupled to said motor for controlling the speed of said motor; means connected to said coupled means for determining the blood flow rate being pumped through the tube by said pump; means for visually displaying a digital readout of said flow rate;
wherein said roller pump includes;an arcuate bearing surface defining an arc of approximately 168°
adapted to carry a flexible tube through which blood may pass;a pair of 180°
spaced apart, pivotally mounted rollers whose axes travel along a circular path concentric with said bearing surface whereby said rollers occlude the tube so as to allow blood to be pumped therethrough;means connected to said gearing means for rotating said rollers around said circular path; and lead ramps extending from each end of said bearing surface, each of said ramps extending substantially tangent to the end of said surface from which said respective ramp extends, said 168°
arc and said tangent ramps providing the optimal torque peak reduction for said motor to drive said pump and the optimal graduated change in cross section of the bore of the tube as each of said rollers approach and recede from the points of occlusion of the tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A blood pump system comprising:
-
a roller pump for pumping blood through a flexible tube; a low voltage D.C. motor having an output shaft; an electrical control circuit for applying necessary voltage for driving said motor at a predetermined speed; gearing means connecting the output shaft of said motor to drive said roller pump; means coupled to said motor for controlling the speed of said motor; means connected to said coupled means for determining the blood flow rate being pumped through the tube by said pump; and means for visually displaying a digital readout of said flow rate;
wherein said electrical control system comprises;rectifier means for rectifying an incoming A.C. line voltage to a D.C. voltage; means electrically connected to said rectifier means for transforming the D.C. voltage to provide a series of relatively low voltage pulses; means electrically connected to said transforming means for controlling said transforming means to maintain the D.C. voltage output from said transforming means below a predetermined voltage level; and means electrically connected to the output of said transforming means for controlling the input of said output pulses from said transforming means to said motor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
-
-
19. A improved control system for driving a blood pump comprising:
-
rectifier means for rectifying an incoming A.C. line voltage to a D.C. voltage; means electrically connected to said rectifier means for transforming the D.C. voltage to provide a series of relatively low voltage pulses; means electrically connected to said transforming means for controlling said transforming means to maintain the D.C. voltage output from said transforming means below a predetermined voltage level; a D.C. motor for providing the necessary torque to drive a blood pump; means electrically connected to the output of said transforming means for controlling the input of said output pulses from said transforming means to said motor; means coupled to said motor for determing a frequency representative of the rotational output speed of said motor; means electrically connected to said frequency determining means for converting the output of said frequency determining means from frequency to voltage; means for generating an error signal representing the difference between the voltage representing the speed at which said motor is set and the output voltage of said converting means, said error signal being connected to said input controlling means to control the duty cycle of the pulses supplied to said motor thereby determining the speed of the motor; means coupled to said frequency determining means for determining the blood flow rate through said blood pump which is a constant of proportionality times the rotational speed of said motor; and means for visually displaying a digital readout of said flow rate. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
-
-
27. A blood pump system comprising:
-
a roller pump for pumping blood through a flexible tube; a low voltage D.C. motor having an output shaft; an electrical control circuit for applying necessary voltage for driving said motor at a predetermined speed; gearing means connecting the output shaft of said motor to drive said roller pump; means coupled to said motor for controlling the speed of said motor; means connected to said coupled means for determining the blood flow rate being pumped through the tube by said pump; means for visually displaying a digital readout of said flow rate; and resettable electronic latching means electrically connected to said motor and responsive to motor current and voltage signals for protecting against motor overload and motor runaway by disabling said motor when motor current or voltage exceed preset levels, respectively.
-
Specification