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Ventricular assist device capable of promoting recovery of cardiac function
| Details |
Inventors: Miyawaki, Fujio;
Assignee:
Primary Examiner: Bockelman; Mark
Assistant Examiner:
Attorney, Agent or Firm: McDermott, Will & Emery
A ventricular assist device 10 includes a blood conduit 14, which carries the blood ejected from the ventricle to the ventricular assist device, a one-way valve 22, which is provided in the blood conduit and can open only toward the ventricular assist device, an afterload-controlling chamber 11, which temporarily stores the blood ejected from the ventricle, a pressure sensor 23, which measures the pressure in the afterload-controlling chamber, a blood pump 25 and a control unit 26 thereof, a blood conduit 16 that carries the blood to an artery, and a probe 27 for measuring blood flow rate and a flowmeter 28, which control the flow rate of the blood pump 25. The pressure of the afterload-controlling chamber 11 is controlled so as to keep the one-way valve closed during ventricular diastole, and also controlled so as to direct all the blood ejected from the ventricle into the afterload-controlling chamber 11 during ventricular systole. Therefore, a new ventricular assist device can be provided, which enables the native heart to eject blood with very low ejection resistance and ensures sufficient ventricular relaxation and filling. |
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DETAILED DESCRIPTION What is claimed is: 1.
A ventricular assist device to be provided between a ventricle of a native heart and an artery, comprising: a first blood conduit carrying blood from said ventricle to said ventricular assist device; a one-way valve, which is provided in said blood conduit and can open only toward said ventricular assist device; an afterload-controlling chamber temporarily storing the blood ejected from said ventricle; a blood pump providing blood temporarily stored in said afterload-controlling chamber for the artery; and pressure maintaining means for maintaining pressure in said afterload-controlling chamber within a predetermined range.
2.
The ventricular assist device as defined in claim 1, wherein said predetermined range of pressure during ventricular systole is a pressure range that is lower than arterial pressure, and said predetermined range during ventricular diastole is a pressure range that keeps said one-way valve closed.
3.
The ventricular assist device as defined in claim 2, further comprising pressure adjusting means for maintaining the pressure of said afterload-controlling chamber within a predetermined range.
4.
The ventricular assist device as defined in claim 2, further comprising a flowmeter measuring flow rates of blood pumped into said artery by said blood pump.
5.
The ventricular assist device as defined in claim 4, further comprising means for controlling the flow rate of said blood pump on the basis of the flow rate measured with said flowmeter.
6.
The ventricular assist device as defined in claim 5, wherein said control means controls flow rate of said blood pump additionally on the basis of the pressure measured by said pressure-measuring means.
7.
The ventricular assist device as defined in claim 1, further comprising: pressure-measuring means for measuring the pressure of said afterload-controlling chamber, wherein said blood pump includes means for controlling the flow rate of said blood pump on the basis of said pressure measured by said pressure-measuring means
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