A ventricular assist device
A cardiac ventricular assist device or VAD (1) comprising a pumping unit (3-6) with a variable-volume chamber (3) capable of receiving a mass of blood, as well as a control unit (8) to control the pumping unit (3-6) to obtain contraction of the variable-volume chamber (3), with consequent expulsion...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A cardiac ventricular assist device or VAD (1) comprising a pumping unit (3-6) with a variable-volume chamber (3) capable of receiving a mass of blood, as well as a control unit (8) to control the pumping unit (3-6) to obtain contraction of the variable-volume chamber (3), with consequent expulsion of the blood collected in the chamber (3), and expansion of the variable-volume chamber (3) consequent on the flow of blood into the chamber (3). Likewise present are a flow line (7), such as a transcutaneous line, for a gaseous flow caused by the contraction and expansion of the variable-volume chamber (3). A sensor (10) sensitive to the gaseous flow in the flow line (7) generates a flow-meter signal that is indicative of the expulsion and inflow of blood with regard to the variable-volume chamber (3). The control unit (8) is sensitive to said flow-meter signal and utilises that signal to control the pumping unit (3-6), for example to cause the pumping unit (3-6) to operate in a condition of synchronous counterpulsation with regard to the natural heart, that is with the variable-volume chamber (3) capable of receiving blood from the assisted heart (C) when it is in a systolic phase and the variable-volume chamber (3) that expels the blood collected in the chamber (3), when the assisted heart (C) is in a diastolic phase. |
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