Abstract: Hydraulic pulsation equipment is intended for varying the volume of a chamber of a perfusion pump by alternatively inflating and deflating the same by means of a movement transmitting liquid fluid. It comprises a lung body provided with an elastic and deformable frontal membrane over which an external piston, which can be moved alternatively in both directions, enters into contact, and said piston originates from one of the sides of a control console. This console also has an enveloping ring head that surrounds the external piston, while constituting the fixation means of the lung body, which has a terminal narrowing connected to an intermediate tubular duct culminating in the chamber of the perfusion pump, and the movement transmitting liquid fluid is located in a space comprising a front part of the lung body, the intermediate tubular duct and the chamber of the perfusion pump.

Abstract: In blood perfusion during cardiac surgery or ventricular assistance, for treating cardiac insufficiency, use is currently made of a centrifugal pump that generates a linear flow in the circulatory system, counter to the pulsating flow generated by the heart. According to the invention, a pulsating linear flow is achieved for blood perfusion by providing, in the interior wall of the chamber or casing of the pump (3), an elastic lining (8) in the form of a bell-shaped membrane that inflates and deflates, producing variations in volume and changes in pressure that give rise to a pulsating effect in the flow at the outlet (6) from the pump (3). At the inlet (5) to the pump (3) there is a non-return valve formed by an annular thickening (11).

Abstract: The equipment comprises an impulsion pump (5-5′) with a displaceable piston (7), that adopts a bellows shape, located in the inside of the same, the chamber of the pump receiving the patient's venous blood from a reservoir (4). In the communication (16) between the reservoir and the chamber a float valve (17) has been provided for, a valve that closes the passage when the piston (7) impels the blood through a nozzle (15), passing through a valve (22), then through a heat exchanger (28) and then through an oxygenator (29) from which the oxygenated blood is sent once again to the patient. The shaft (9) of the nozzle (7) is operated by a mechanism (14) that transforms the rotating and alternate movements of a servomotor (12) into linear movements, the operation of this servomotor (12) being controllable by means of a computerized console, permitting a pulsatile blood flow to be provided with adjustable flow and frequency.

Abstract: An extracorporeal blood pump for cardiac surgery is disclosed having a housing with a cylindrical cavity, radially-spaced input and output ports and a pair of radial blades within the cavity. The blades are supported on independent, concentric axles such that one blade can remain between the ports while the other blade rotates to create independent input and output chambers. Magnetic elements attached to the axles are in magnetic coupling relation to corresponding magnetic elements of two independent motors. The blades and magnetic elements corrected thereto are covered in plastic and are hermetically sealed within the housing. A programmable logic controller controls the motion and the blades to simulate the pulsatile pumping of a human heart. The axles of the blades can extend out one side of the housing for engagement by a manual activation device operable to continuously alternately rotate one of the axles one half rotation while holding the other axle motionless.