Patent
Cardiac flow measurement system and method
Steven D. Nielson,Peter Willshaw +1 more
TLDR
In this paper, the volume of blood pumped by an artificial ventricle or ventricular assist device is extracorporeally monitored as a function of the volume used to drive the ventricles.Abstract:
The volume of blood pumped by an artificial ventricle or ventricular assist device is extracorporeally monitored as a function of the volume of fluid used to drive the ventricle. The ventricle is divided into two chambers by a flexible diaphragm. Fluid is alternately supplied to one chamber during systole and then removed from that chamber during diastole. In the preferred embodiment, during systole the rate of fluid flow is sensed by establishing a differential pressure between two points in the fluid's flow path. The differential pressure is converted to a proportional voltage which may be integrated to provide the desired volume over a given time interval, which corresponds to the cardiac output within ±5-10%.read more
Citations
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Patent
High-frequency transvalvular axisymmetric blood pump
TL;DR: A high-frequency transvalvular blood pump (10) for temporary cardiac assist devices provides suction to decompress the ventricular cavity during both systole and diastole.
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Redundant piston pump for the operation of single or multiple chambered pneumatic blood pumps
TL;DR: In this paper, a pneumatic driver for a blood pump is described, in which a pair of pistons are contained in a common cylinder and their stroke rates and lengths are selectively controlled by a controller which non-invasively senses the circulatory system requirements of the patient in which the blood pump was implanted.
References
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Patent
Flow meter for indirectly measuring the flow of blood from a blood pump
J Joyce,F Villarroel +1 more
TL;DR: In this article, a flow meter is used to measure the flow of blood from a PULSATILE BLOOD PUMP without the need of entering the BLOOD STREAM itself to secure a measure.
Patent
Automatic operation of blood circulating pump - with hydraulic or pneumatic diaphragm pump and diaphragm position detector
TL;DR: In this article, a diaphragm position detector which emits a pulse in both end positions of the diaphrasms operates a trigger for signalling the end position of the daphrasm, which operates a bistable switch which operates an electromagnetic valve in the pipe leading from the hydraulic or pneumatic energy store to the pump.