Method and apparatus for a pulsatile blood pump with no hemolysis

Claim 2

A pulsatile blood pump having transducer means for housing a "C" shaped magnet providing a constant magnetic field between the north and south poles of said magnet, and tray means being insertable into a cavity of said transducer means, said pulsatile blood pump comprising: a disposable insert for insertion into an extracorporeal circuit, said disposable insert comprising: a central section having a rectangular outer surface and a constant tubular bore, said central section comprising a first electric field plate and a second electric field plate being disposed on diametrically opposite sides of said outer surface of said central section, said first and second electric field plates being respectively connected to negative and positive terminals of a voltage source for generating an electric field between said first and second electric field plates, said electric field being perpendicular to said magnetic field; and first and second end sections each having a conical shape for enabling said disposable insert to be inserted into said extracorporeal circuit, said first and second end portions each having a constant tubular bore diametrically equal to the constant tubular bore of said central section for enabling blood to flow unimpaired through said disposable insert.

Claim 3

The pulsatile blood pump as set forth in claim 1, further comprising: said first and second field plates each having a prong extending therefrom; and a pair of sockets in said tray means for receiving said prongs in order to connect said first and second field plates respectively to said negative and positive terminals of said voltage source.

Claim 4

The pulsatile blood pump as set forth in claim 1, further comprising: an electromagnetic flow transducer disposed in said extracorporeal circuit, downstream from said disposable insert, for detecting velocity of blood flowing from said disposable insert and generating a voltage proportional to the velocity of blood flow; first means, responsive to said voltage, for displaying a value corresponding to mean blood flow and generating an analog pulsatile blood flow signal; second means, responsive to said analog pulsatile blood flow signal, for displaying a waveform indicative of said analog pulsatile blood flow signal; said voltage source generating a high direct current voltage, for connection to said first and second electric field plates, in response to binary control signal; and control means for generating said binary control signal in response to a user selected one of a plurality of selectable pulsatile blood flow waveforms.

Claim 5

The pulsatile blood pump as set forth in claim 3, further comprising: means, under user control, for adjusting said high direct current voltage for setting a desired mean blood flow rate.

Claim 6

The pulsatile blood pump as set forth in claim 3, said first means comprising: square wave electromagnet coil drive means, responsive to a timing signal output by a timing generator, for generating a magnetic drive voltage for driving an electromagnet housed in said electromagnetic flow transducer; high impedance differential amplification means for receiving said voltage generated by said electromagnetic flow transducer for outputting an amplified signal; synchronous demodulator means, responsive to said timing signal, for outputting a demodulated signal by demodulating said amplified signal; amplifier means for generating said pulsatile blood flow signal by amplifying said demodulated signal; low pass filter means for generating a mean blood flow signal, said mean blood flow signal being supplied to a three segment display for display as said value corresponding to said mean blood flow; and scaling means for outputting a scaled voltage by scaling said mean blood flow signal, said scaled voltage being provided to said second means for display superimposed over said analog pulsatile blood flow waveform.

Claim 7

The pulsatile blood pump as set forth in claim 3, said second means comprising: a resettable digital clock for generating a clock timing signal and a digital elapsed time counting chain; and a three color display for displaying said waveform indicative of said analog pulsatile blood flow signal.

Claim 8

The pulsatile blood pump as set forth in claim 5, further comprising: a resettable digital clock for generating a clock timing signal and a digital elapsed time counting chain.

Claim 9

The pulsatile blood pump as set forth in claim 7, further comprised of said second means receiving said clock timing signal, said digital elapsed time counting chain, a signal representative of systolic blood pressure, said pulsatile blood flow signal and said scaled voltage and deriving a scaled pulse rate signal, a scaled stroke volume signal a scaled peak blood flow signal and a scaled blood pressure signal for display on an alphanumeric display.

Claim 10

A pulsatile blood pump having transducer means for housing a "C" shaped magnet providing a constant magnetic field between the north and south poles of said magnet, and tray means having a plurality of slide terminals, said tray means being insertable into a cavity of said transducer means, said pulsatile blood pump comprising: a disposable insert for insertion into an extracorporeal circuit, said disposable insert comprising: a central section having a rectangular outer surface and a constant tubular bore, said central section comprising a first electric field plate and a second electric field plate being disposed on diametrically opposite sides of said outer surface of said central section, said first and second electric field plates being respectively connected to negative and positive terminals of a voltage source for generating an electric field between said first and second electric field plates, said electric field being perpendicular to said magnetic field; and first and second end sections each having a conical shape for enabling said disposable insert to be inserted into said extracorporeal circuit, said first and second end portions each having a constant tubular bore diametrically equal to the constant tubular bore of said central section for enabling blood to flow unimpaired through said disposable insert; an electromagnetic flow transducer disposed in said extracorporeal circuit, downstream from said disposable insert, for detecting velocity of blood flowing from said disposable insert and generating a voltage proportional to the velocity of blood flow; first means, responsive to said voltage, for displaying a value corresponding to mean blood flow and generating an analog pulsatile blood flow signal; second means, responsive to said analog pulsatile blood flow signal, for displaying a waveform indicative of said analog pulsatile blood flow signal; said voltage source generating a high direct current voltage, for connection to said first and second electric field plates, in response to binary control signal; and control means for generating said binary control signal in response to a user selected one of a plurality of selectable pulsatile blood flow waveforms.

Claim 11

A pulsatile blood pump having transducer means for housing a "C" shaped magnet providing a constant magnetic field between the north and south poles of said magnet, and tray means having a plurality of slide terminals, said tray means being insertable into a cavity of said transducer means, said pulsatile blood pump comprising: a disposable insert for insertion into an extracorporeal circuit, said disposable insert comprising: a central section having a rectangular outer surface and a constant tubular bore, said central section comprising a first electric field plate and a second electric field plate being disposed on diametrically opposite sides of said outer surface of said central section, said first and second electric field plates being respectively connected to negative and positive terminals of a voltage source for generating an electric field between said first and second electric field plates, said electric field being perpendicular to said magnetic field; and first and second end sections each having a conical shape for enabling said disposable insert to be inserted into said extracorporeal circuit, said first and second end portions each having a constant tubular bore diametrically equal to the constant tubular bore of said central section for enabling blood to flow unimpaired through said disposable insert; an electromagnetic flow transducer disposed in said extracorporeal circuit, downstream from said disposable insert, for detecting velocity of blood flowing from said disposable insert and generating a voltage proportional to the velocity of blood flow; first means, responsive to said voltage, for displaying a value corresponding to mean blood flow and generating an analog pulsatile blood flow signal; second means, responsive to said analog pulsatile blood flow signal, for displaying a waveform indicative of said analog pulsatile blood flow signal; said voltage source generating a high direct current voltage, for connection to said first and second electric field plates, in response to binary control signal; and control means for generating said binary control signal in response to a user selected one of a plurality of selectable pulsatile blood flow waveforms.

Claim 12

The pulsatile blood pump as set forth in claim 9, further comprising: means, under user control, for adjusting said high direct current voltage for setting a desired mean blood flow rate.

Claim 13

The pulsatile blood pump as set forth in claim 9, said first means comprising: square wave electromagnet coil drive means, responsive to a timing signal output by a timing generator, for generating a magnetic drive voltage for driving an electromagnet housed in said electromagnetic flow transducer; high impedance differential amplification means for receiving said voltage generated by said electromagnetic flow transducer for outputting an amplified signal; synchronous demodulator means, responsive to said timing signal, for outputting a demodulated signal by demodulating said amplified signal; amplifier means for generating said pulsatile blood flow signal by amplifying said demodulated signal; low pass filter means for generating a mean blood flow signal, said mean blood flow signal being supplied to a three segment display for display as said value corresponding to said mean blood flow; and scaling means for outputting a scaled voltage by scaling said mean blood flow signal, said scaled voltage being provided to said second means for display superimposed over said analog pulsatile blood flow waveform.

Claim 16

The method as set forth in claim 12, further comprising the steps of: generating a voltage proportional to a volume rate of flow of blood being pumped by said blood pump; deriving an analog pulsatile blood flow signal and a mean blood flow signal in response to said voltage generated by said step of generating a voltage; gain scaling said mean blood flow signal; displaying a waveform indicative of said analog pulsatile blood flow signal; and superimposing said gain scaled blood flow signal over the displayed waveform.

Claim 17

The method as set forth in claim 12, said step of generating a binary control signal comprises generating a sixteen bit binary signal by a microprocessor control unit.