Fluid pump
First Claim
1. A pump for pumping a fluid comprising:
- at least one linear electromagnetic motor;
at least one pump drive head, coupled to said linear electromagnetic motor, said pump drive head configured for movement in a linear direction;
at least one fluid housing, responsive to said linear movement of said at least one pump drive head, and defining a deformable fluid chamber configured to contain a fluid, said fluid housing including a first and at least a second port, wherein said first port is configured to allow said fluid to flow substantially into said deformable fluid chamber and said second port is configured to allow said fluid to flow substantially out of said deformable fluid chamber, wherein said pump drive head is configured to deform said deformable fluid chamber causing a pressure differential within said deformable fluid chamber thus changing the volume of said deformable fluid chamber and forcing said fluid in or out said deformable fluid chamber through said first and second ports respectively; and
a controller, coupled to said at least one linear motor, and configured to apply an energizing current to said linear electromagnetic motor in a predetermined waveform based upon a maximum positive energizing current value (systole) setting established in said controller, a maximum negative energizing current value (diastole) setting established in said controller, a cycle rate setting established in said controller, and the ratio of maximum positive to maximum negative energizing current value established in said controller such that said controller is configured to cause a maximum volume of fluid for a given pressure at a predetermined time and target pressure to be displaced within said fluid chamber.
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Accused Products
Abstract
A pumping system 10 provides a physiological pulsatile flow and includes controller 121, a pump drive head 50 coupled to a motor 12 and a fluid housing 52 having at least one port 60. The port 60 includes a ball valve retainer region 69, a valve seat 73, and an occluder ball 71 disposed in the ball valve retainer region 69. During operation, the motor 12 forces the fluid in and out the fluid housing 52 and causes the occluder ball 71 to move from a first position whereby the fluid cannot pass through the port 60, to a second position whereby the fluid moves annular to and generally around the occluder ball 71. This movement creates a slight flow reversal that “breaks up” any blood clots that may form. The pumping system may be used as part of a cardiopulmonary bypass system, a ventricular assist device (VAD) and/or a heart pump.
271 Citations
18 Claims
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1. A pump for pumping a fluid comprising:
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at least one linear electromagnetic motor; at least one pump drive head, coupled to said linear electromagnetic motor, said pump drive head configured for movement in a linear direction; at least one fluid housing, responsive to said linear movement of said at least one pump drive head, and defining a deformable fluid chamber configured to contain a fluid, said fluid housing including a first and at least a second port, wherein said first port is configured to allow said fluid to flow substantially into said deformable fluid chamber and said second port is configured to allow said fluid to flow substantially out of said deformable fluid chamber, wherein said pump drive head is configured to deform said deformable fluid chamber causing a pressure differential within said deformable fluid chamber thus changing the volume of said deformable fluid chamber and forcing said fluid in or out said deformable fluid chamber through said first and second ports respectively; and a controller, coupled to said at least one linear motor, and configured to apply an energizing current to said linear electromagnetic motor in a predetermined waveform based upon a maximum positive energizing current value (systole) setting established in said controller, a maximum negative energizing current value (diastole) setting established in said controller, a cycle rate setting established in said controller, and the ratio of maximum positive to maximum negative energizing current value established in said controller such that said controller is configured to cause a maximum volume of fluid for a given pressure at a predetermined time and target pressure to be displaced within said fluid chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A cardiopulmonary bypass system configured to provide physiological pulsatile blood flow, the system comprising at least a first pump including:
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at least a first linear electromagnetic motor; at least one pump drive head coupled to said at least a first linear electromagnetic motor, said pump drive head configured for moving in a linear direction; at least a first deformable fluid housing, responsive to said linear movement of said a least one pump drive head, defining a fluid chamber configured to contain blood, said first deformable fluid housing including an inlet and an outlet port configured for allowing said blood to pass generally into and generally out of said fluid housing respectively, each port including a ball valve configured for moving between a first and a second position wherein in said first position said fluid can pass through said port and wherein in said second position said fluid cannot pass through said port, wherein said pump drive head is configured to deform said deformable fluid chamber causing a pressure differential within said deformable fluid chamber which causes said ball valves to move from said first to said second position and creates a slight reversal in the flow of said blood in said deformable fluid chamber, wherein said first pump is configured to pump said blood from a venous reservoir into said input port and into a heat exchanger, an oxygenator and an arterial filter all coupled to said outlet port of said at least a first pump and into a patient'"'"'s arterial system; and a controller, coupled to said at least one linear motor, and configured to apply an energizing current to said linear electromagnetic motor in a predetermined waveform based upon a maximum positive energizing current value (systole) setting established in said controller, a maximum negative energizing current value (diastole) setting established in said controller, a cycle rate setting established in said controller, and the ratio of maximum positive to maximum negative energizing current value established in said controller such that said controller is configured to cause said pump to provide physiological pulsatile blood flow by ensuring that a maximum volume of blood for a given pressure at a predetermined time and target pressure is displaced within said fluid chamber and within a patient'"'"'s arterial system. - View Dependent Claims (15, 16, 17, 18)
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Specification