Drive device for a membrane fluid pump and operating method
First Claim
1. A drive device for a membrane fluid pump, the drive device comprising:
- a working pump, the working pump connected to the membrane fluid pump via a pressure line in order to drive the membrane fluid pump, and the working pump having a hollow cylinder and a working piston configured to oscillate axially therein between two reversal points for contraction and expansion of a working chamber in the working pump, the working chamber being in a pressure exchanging connection with the pressure line; and
a control unit configured to control a movement of the working piston between the two reversal points, the controlled movement of the working piston comprising three temporally successive phases,wherein in a first phase the working piston is accelerated to a speed that is greater than a speed at the end of the first phase,wherein in a second phase the working piston is moved such that a specified speed of the working piston, a specified relative pressure in the working chamber, or a specified force of the working piston is kept substantially constant,andwherein in a third phase the working piston is moved at a negative acceleration.
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Accused Products
Abstract
A drive device is provided comprising a working pump, the working pump connected to a membrane fluid pump, and the working pump having a working piston able to oscillate axially between two reversal points for contracting and expanding a working chamber, and a control unit for controlling a movement of the working piston between the two reversal points. The controlled movement of the working piston comprises three temporally successive phases, in a first phase the working piston is accelerated to a speed that is greater than a speed at the end of the first phase, in a second phase the working piston is moved such that a specified speed of the working piston, a specified relative pressure in the working chamber, or a specified force of the working piston is substantially kept constant, and in a third phase the working piston is moved at a negative acceleration.
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Citations
24 Claims
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1. A drive device for a membrane fluid pump, the drive device comprising:
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a working pump, the working pump connected to the membrane fluid pump via a pressure line in order to drive the membrane fluid pump, and the working pump having a hollow cylinder and a working piston configured to oscillate axially therein between two reversal points for contraction and expansion of a working chamber in the working pump, the working chamber being in a pressure exchanging connection with the pressure line; and a control unit configured to control a movement of the working piston between the two reversal points, the controlled movement of the working piston comprising three temporally successive phases, wherein in a first phase the working piston is accelerated to a speed that is greater than a speed at the end of the first phase, wherein in a second phase the working piston is moved such that a specified speed of the working piston, a specified relative pressure in the working chamber, or a specified force of the working piston is kept substantially constant, and wherein in a third phase the working piston is moved at a negative acceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A cardiac support system comprising:
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a membrane blood pump; an inlet cannula connected to the membrane blood pump, the inlet cannula configured to supply blood from a ventricle and/or an atrium of a heart to the membrane blood pump; an outlet cannula connected to the membrane blood pump, the outlet cannula configured to conduct the blood out of the membrane blood pump into a blood vessel; a working pump, the working pump connected to the membrane blood pump via a pressure line in order to drive the membrane blood pump, and the working pump having a hollow cylinder and a working piston configured to oscillate axially therein between two reversal points for contraction and expansion of a working chamber in the working pump, the working chamber being in a pressure exchanging connection with the pressure line; and a control unit configured to control a movement of the working piston between the two reversal points, the controlled movement of the working piston comprising three temporally successive phases, wherein in a first phase the working piston is accelerated to a speed that is greater than a speed at the end of the first phase, wherein in a second phase the working piston is moved such that a specified speed of the working piston, a specified relative pressure in the working chamber, or a specified force of the working piston is kept substantially constant, and wherein in a third phase the working piston is moved at a negative acceleration.
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15. A method for operating a drive device for a membrane fluid pump, the drive device comprising a working pump, the working pump connected to the membrane fluid pump via a pressure line in order to drive the membrane fluid pump, and the working pump having a hollow cylinder and a working piston configured to oscillate axially therein between two reversal points for contraction and expansion of a working chamber in the working pump, the working chamber being in a pressure exchanging connection with the pressure line, the method comprising moving the working piston in three temporally successive phases by:
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accelerating, in a first phase, the working piston to a speed that is greater than a speed of the working piston at an end of the first phase, moving, in a second phase, the working piston such that a predefined speed of the working piston, a predefined relative pressure in the working chamber, or a predefined force of the working piston is kept substantially constant, and deaccelerating the working piston in a third phase. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification