Multipurpose cardiocirculatory assist cannula and methods of use thereof
First Claim
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1. A multipurpose cardiocirculatory assist device comprising:
- a hollow elongated cannula having a diameter sufficiently small for insertion into a human artery leading to the aorta, said cannula having a leading tip at the upstream end and a trailing end at the downstream end thereof, wherein upstream and downstream relate to the direction of blood flow during arterial usage;
electrode means at the leading tip of said cannula for pacing the heart;
blood pump means to pump blood from the left ventricle during cardiac systole and into the aorta during cardiac diastole, including inlet valve means along said cannula and adapted to be disposed within the left ventricle during usage for allowing blood to pass into said blood pump means, and outlet valve means along said cannula downstream from said inlet valve means and adapted to be disposed within the aorta during usage for allowing blood to pass out of said blood pump means; and
supplementary heart pumping assist means comprising balloon pump means including a balloon connected to said cannula disposed downstream from said outlet valve means, said balloon pump means causing inflation of said balloon during cardiac diastole and deflation of said balloon during cardiac systole.
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Abstract
A method and device for assisting cardiocirculation includes inserting a cannula in the axillary or subclavian artery, which cannula has associated therewith a blood pump, a balloon pump which responds to EKG signals, and a heart pacer which triggers the EKG and is capable of responding to and reversing ventricular extra systoles, and maneuvering the cannula into the aorta and left ventricle. The device functions by directly unloading surplus blood from the left ventricle of the heart, thereby reducing the work load of the heart so that it may in time recover from a serious if not critical insult.
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Citations
19 Claims
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1. A multipurpose cardiocirculatory assist device comprising:
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a hollow elongated cannula having a diameter sufficiently small for insertion into a human artery leading to the aorta, said cannula having a leading tip at the upstream end and a trailing end at the downstream end thereof, wherein upstream and downstream relate to the direction of blood flow during arterial usage; electrode means at the leading tip of said cannula for pacing the heart; blood pump means to pump blood from the left ventricle during cardiac systole and into the aorta during cardiac diastole, including inlet valve means along said cannula and adapted to be disposed within the left ventricle during usage for allowing blood to pass into said blood pump means, and outlet valve means along said cannula downstream from said inlet valve means and adapted to be disposed within the aorta during usage for allowing blood to pass out of said blood pump means; and supplementary heart pumping assist means comprising balloon pump means including a balloon connected to said cannula disposed downstream from said outlet valve means, said balloon pump means causing inflation of said balloon during cardiac diastole and deflation of said balloon during cardiac systole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14)
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11. driving said supplementary heart pumping assist means,
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13. A method for augmenting the action of an ailing heart having a left ventricle and associated aorta, comprising:
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inserting a catheter tip having spaced apart inlet and outlet check valves thereon into the aorta, through the aortic valve and into the left ventricle, said inlet check valve being located adjacent the tip end of the catheter so that blood may be sucked into the catheter from the left ventricle, said outlet check valve being proximally spaced from the tip end of the catheter so as to be located outside the aortic valve permitting blood within the catheter to be pumped directly into the aorta, said catheter further including supplementary heart pumping assist means comprising balloon pump means including a balloon connected to said catheter proximally spaced from said outlet check valve so as to be located in the transverse arc of the aorta distal to the outflow tract of the carotic artery after said inserting step; sequentially sucking blood from said left ventricle by way of said inlet valve of the catheter during systolic pulsation and on reverse cycle, forcing all of said sucked blood back through the catheter and into said aorta via said outlet valve; and inflating said balloon during cardiac diastole and deflating said balloon during systolic pulsation.
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15. A cardiocirculatory assist device, comprising:
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a hollow elongated cannula having a diameter sufficiently small for insertion into a human artery leading to the aorta; a heart pumping assist means comprising balloon pump means including a balloon connected to said cannula, said balloon pump means causing inflation of said balloon during cardiac diastole and deflation of said balloon during cardiac systole;
said heart pumping assist means further including drive means connected to said cannula for supplying gas for inflation and deflation of said balloon pump means;a chamber connected between said drive means and said balloon; and elastic diaphragm means connected within said chamber for preventing gas from said drive means from directly entering said balloon, wherein the balloon side of said diaphragm is airtight and has a preset pressure therein whereby inflation of said balloon is dependent on the position of said diaphragm means.
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16. A heart assist device for pumping blood directly from the left ventricle into the aorta past the artic vlve, comprising:
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catheter means including an elongated member with an axial bore therein and having a distal end for insertion into the left ventricle, said distal end having a tip portion, said tip portion having therein an opening in fluid communication with said bore, said distal end also being provided with a second set of openings axially spaced from said tip opening, said second set of openings also communicating with said bore; first check valve means associated with said tip opening and closing same during first predetermined intervals and opening same during second predetermined intervals; second check valve means associated with said second set of openings and closing said second set of openings during said second predetermined intervals and opening same during said first predetermined intervals; and supplementary heart pumping assist means comprising balloon pump means including a balloon connected to said catheter means proximally spaced from said second check valve means, said balloon pump means causing inflation of said balloon during cardiac diastole and deflation of said balloon during cardiac systole.
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17. A heart assist device for pumping blood directly from the left ventricle into the aorta past the aortic valve comprising catheter means including an elongated member with an axial bore therein and having a distal end for insertion into the left ventricle, said distal end having a tip portion, said tip portion having therein an opening in fluid communication with said bore, said distal end also being provided with a second set of openings axially spaced from said top opening, said second set of openings also communicating with said bore, first check valve means associated with said tip opening and closing same during first predetermined intervals and opening same during second predetermined intervals, second check valve means associated with said second set of openings and closing said second set of openings during said second predetermined intervals and opening same during said first predetermined intervals, and channel means within the wall of said catheter means for introducing electrode means through said catheter means directly into the left ventricle.
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18. A method for augmenting the action of an ailing heart having a left ventricle and associated aorta, comprising:
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inserting a catheter tip having spaced apart inlet and outlet check valves thereon into the aorta, through the aortic valve and into the left ventricle, said inlet check valve being located adjacent the tip end of the catheter so that blood may be sucked into the catheter from the left ventricle, said outlet check valve being proximally spaced from the tip end of the catheter so as to be located outside the aortic valve permitting blood within the catheter to be pumped directly into the aorta, said catheter further including electrode means at the tip end of the catheter for pacing the heart; sequentialy sucking blood from said left ventricle by way of said inlet valve of the catheter during systolic pulsation and on reverse cycle, forcing all of said sucked blood back through the catheter and into said aorta via said outlet check valve; and supplying electrical pulses through said electrode means to ensure a constant heart beat.
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19. A heart assist device for pumping blood directly from the left ventricle into the aorta past the aortic valve, comprising:
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catheter means including an elongated member with an axial bore therein and having a distal end for insertion into the left ventricle, said distal end having a tip portion, said tip portion having therein an opening in fluid communication with said bore, said distal end also being provided with a second set of openings axially spaced from said tip opening, said second set of opening also communicating with said bore; first check valve means associated with said tip opening and closing same during first predetermined intervals and opening same during second predetermined intervals; second check valve means associated with said second set of openings and closing said second set of openings during said second predetermined intervals and opening same during said first predetermined intervals; and electrode means at the tip portion of said catheter means for pacing the heart.
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Specification