Hydraulically actuated cardiac prosthesis with three-way ventricular valving
First Claim
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1. An implantable hydraulically actuated total cardiac prosthesis comprising:
- a pair of blood pumping chambers each having a blood inlet, a blood outlet and a flexible portion;
a pair of actuation chambers each adapted to contain actuation fluid, one of said actuation chambers being operatively associated with one of said blood pumping chambers and the other of said actuation chambers being operatively associated with the other of said blood pumping chambers to cause displacement of the flexible portion of said blood pumping chambers in response to changes in volume of actuation fluid in their associated actuation chambers;
an actuation fluid reservoir;
actuation fluid pumping means separate from and in fluid communication with said reservoir for pumping actuation fluid therefrom; and
a separate three-way valve means associated with each of said actuation chambers, each of said valve means being in fluid communication with its associated actuation chamber, said pumping means and said reservoir, and being adapted to alternately and repetitively direct actuation fluid from said pumping means to its associated actuation chamber and then from its associated actuation chamber to said reservoir;
said reservoir comprising a separate compliant zone associated with each of said actuation chambers, defined at least in part by a flexible wall portion made from biocompatible elastomeric material, said compliant zones communicating with each other, said pumping means and said valve means by flexible ducting.
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Abstract
A cardiac prosthesis having an hydraulically actuated compressible blood pump. An actuation chamber adjacent the blood pump receives hydraulic actuation fluid from an actuator pump through a three-way ventricular dump valve to compress the blood pump during systole and eject blood therefrom. During diastole the actuation fluid is permitted to drain from the actuation chamber through the three-way valve into a reservoir.
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Citations
28 Claims
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1. An implantable hydraulically actuated total cardiac prosthesis comprising:
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a pair of blood pumping chambers each having a blood inlet, a blood outlet and a flexible portion; a pair of actuation chambers each adapted to contain actuation fluid, one of said actuation chambers being operatively associated with one of said blood pumping chambers and the other of said actuation chambers being operatively associated with the other of said blood pumping chambers to cause displacement of the flexible portion of said blood pumping chambers in response to changes in volume of actuation fluid in their associated actuation chambers; an actuation fluid reservoir; actuation fluid pumping means separate from and in fluid communication with said reservoir for pumping actuation fluid therefrom; and a separate three-way valve means associated with each of said actuation chambers, each of said valve means being in fluid communication with its associated actuation chamber, said pumping means and said reservoir, and being adapted to alternately and repetitively direct actuation fluid from said pumping means to its associated actuation chamber and then from its associated actuation chamber to said reservoir; said reservoir comprising a separate compliant zone associated with each of said actuation chambers, defined at least in part by a flexible wall portion made from biocompatible elastomeric material, said compliant zones communicating with each other, said pumping means and said valve means by flexible ducting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An implantable hydraulically actuated total cardiac prosthesis comprising:
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a pair of blood pumping chambers each having a blood inlet, a blood outlet and a flexible portion; a pair of actuation chambers each adapted to contain actuation fluid, one of said actuation chambers being operatively associated with one of said blood pumping chambers and the other of said actuation chambers being operatively associated with the other of said blood pumping chambers to cause displacement of the flexible portion of said blood pumping chambers in response to changes in volume of actuation fluid in their associated actuation chambers; an actuation fluid reservoir; actuation fluid pumping means separate from and in fluid communication with said reservoir for pumping actuation fluid therefrom, said actuation fluid pumping means comprising a two-sided reversible pump and a drive motor therefor, each side of said reversible pump alternately serving as an inlet and an outlet, a separate flow path communicating each side of said reversible pump with said reservoir, and check valve means in each of said flow paths for permitting flow of actuation fluid along said flow paths only from said reservoir to said reversible pump; and
a separate three-way valve means associated with each of said actuation chambers, each of said valve means being in fluid communication with its associated actuation chamber, said pumping means and said reservoir, and being adapted to alternately and repetitively direct actuation fluid from said pumping means to its associated actuation chamber and then from its associated actuation chamber to said reservoir. - View Dependent Claims (28)
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Specification