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US 5,429,584 AGranted
Cardiac assist method and apparatus
AssigneeMcGill University
InventorRay C. Chiu
Life of this patent
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AssigneeMcGill University
InventorRay C. Chiu
Estimating the term…
A copulsation and counterpulsation cardiac assist device, wherein the copulsation means includes an extra ventricular cup having and expansible envelope for compressing the heart during systole, and the counterpulsation means comprises a peri-aortic jacket including a fluid expansible balloon for compressing a portion of the aorta during diastole. Belows are provided to be activated by the latissimus dorsi muscles respectively for alternating the supply of fluid pressure to the copulsation device and the counterpulsation device. A heart sensor senses the heart rate, and a pulse train device activates each of the muscles in alternate fashion to contract the respective muscles for producing the required alternating fluid pressure flow. A negative pressure booster includes separate flow chambers through which the alternating fluid pressure flows and a reciprocating pump induces negative pressure in the other of the chambers when fluid pressure flows one chamber to enhance withdrawal of the fluid from a respective one of the copulsation device and the counterpulsation device.
A copulsation and counterpulsation cardiac assist apparatus comprising copulsation means including a peri-cardiac assist means including a fluid expansible envelope for compressing the heart during systole and counterpulsation means comprising a peri-aortic jacket means including a fluid expansible balloon for compressing a portion of the aorta during diastole, muscle powered fluid pressure means provided for supplying alternating fluid pressure to the copulsation means and to the counterpulsation means, means provided for sensing the heart rate and means for producing a stimulating pulse to selected muscles to contract such muscles in response to signals from the means for producing the required alternating fluid pressure flow, negative pressure booster means including adjacent separate flow chambers through which the alternating fluid pressures flow, and a reciprocating pump means having at least a pump element in each of the chambers such that when the fluid pressure flows through one chamber, it induces a pump means to provide a negative pressure in the other chamber to enhance withdrawal of the fluid from a respective one of the copulsation means and counterpulsation means.
A cardiac assist system comprising:
A method of assisting systole and diastole comprising:
Dependencies are inferred from the claim text.