A compliance restoration implant device includes a first compliant fluid container, a second compliant fluid container, and a conduit structure. The first compliant fluid container includes a first lumen that widens in response to fluid leaving the first compliant fluid container and narrows in response to the fluid entering the first compliant fluid container. The second compliant fluid container includes a second lumen that widens in response to the fluid leaving the second compliant fluid container and narrows in response to the fluid entering the second compliant fluid container. The conduit structure is coupled to the first compliant fluid container and the second compliant fluid container and is configured to pass fluid between the first compliant fluid container and the second compliant fluid container in response to changing pressure levels outside one of the fluid containers.

A compliance restoration implant device includes a first compliant fluid container, a second compliant fluid container, and a conduit structure. The first compliant fluid container includes a first lumen that widens in response to fluid leaving the first compliant fluid container and narrows in response to the fluid entering the first compliant fluid container. The second compliant fluid container includes a second lumen that widens in response to the fluid leaving the second compliant fluid container and narrows in response to the fluid entering the second compliant fluid container. The conduit structure is coupled to the first compliant fluid container and the second compliant fluid container and is configured to pass fluid between the first compliant fluid container and the second compliant fluid container in response to changing pressure levels outside one of the fluid containers.

A blood pump comprises a pump casing having a blood flow inlet and a blood flow outlet, and an impeller arranged in said pump casing so as to be rotatable about an axis of rotation. The impeller has blades sized and shaped for conveying blood from the blood flow inlet to the blood flow outlet. The blood pump also has an outflow cannula having an upstream end portion, a downstream end portion and an intermediate portion extending between the upstream end portion and the downstream end portion. The upstream end portion of the outflow cannula is connected to the pump casing such that blood is conveyed from the blood flow outlet of the pump casing into and through the intermediate portion of the outflow cannula towards the downstream end portion of the outflow cannula, wherein the downstream end portion has a blood flow outlet through which blood can exit the outflow cannula. At least a portion of the intermediate portion of the outflow cannula has an outer diameter that is larger than an outer diameter of the pump casing.

A blood pump comprises a pump casing having a blood flow inlet and a blood flow outlet, and an impeller arranged in said pump casing so as to be rotatable about an axis of rotation. The impeller has blades sized and shaped for conveying blood from the blood flow inlet to the blood flow outlet. The blood pump also has an outflow cannula having an upstream end portion, a downstream end portion and an intermediate portion extending between the upstream end portion and the downstream end portion. The upstream end portion of the outflow cannula is connected to the pump casing such that blood is conveyed from the blood flow outlet of the pump casing into and through the intermediate portion of the outflow cannula towards the downstream end portion of the outflow cannula, wherein the downstream end portion has a blood flow outlet through which blood can exit the outflow cannula. At least a portion of the intermediate portion of the outflow cannula has an outer diameter that is larger than an outer diameter of the pump casing.

A bidirectional intravascular blood pump system is disclosed for deployment in the descending aorta to improve perfusion in both upper and lower extremities. In some embodiments, the system includes a flexible stent housing containing an inflatable pump chamber and selectively inflatable proximal and distal check valves. In some embodiments, a controller sequences inflation and deflation of the pump components in coordination with the cardiac cycle. In some embodiments, the system capable of dynamically providing flow in opposite directions within the descending aorta to optimize systemic and cerebral perfusion. In some embodiments, the system can direct blood flow in either direction through the aorta by an inflation sequence of the check valves and pump chamber. In some embodiments, one or more bypasses in a check element, stent, and/or formed from selective inflation, enable pressurization of the aortic arch when timed with the closing of the aortic valve.

A bidirectional intravascular blood pump system is disclosed for deployment in the descending aorta to improve perfusion in both upper and lower extremities. In some embodiments, the system includes a flexible stent housing containing an inflatable pump chamber and selectively inflatable proximal and distal check valves. In some embodiments, a controller sequences inflation and deflation of the pump components in coordination with the cardiac cycle. In some embodiments, the system capable of dynamically providing flow in opposite directions within the descending aorta to optimize systemic and cerebral perfusion. In some embodiments, the system can direct blood flow in either direction through the aorta by an inflation sequence of the check valves and pump chamber. In some embodiments, one or more bypasses in a check element, stent, and/or formed from selective inflation, enable pressurization of the aortic arch when timed with the closing of the aortic valve.

A cardiac assist device includes an expandable cup with a pumping chamber having at least one inflow aperture, an outflow nozzle in communication with the chamber, and a volume displacement member inside the chamber. The volume displacement member is cyclically movable between a low-volume state and a high-volume state at a frequency F, wherein a displacement volume of blood Vd is displaced from the chamber through the nozzle during each cycle. When the volume displacement member moves at frequency F, the device increases momentum of blood flowing through the device such that flow rate of blood exiting the nozzle is substantially greater than the frequency F multiplied by the displacement volume Vd. In some embodiments, the volume displacement member includes a balloon having a proximal region that is distanced from an inner wall of the chamber more than a distal region of the balloon when the balloon is fully inflated.

A cardiac assist device includes an expandable cup with a pumping chamber having at least one inflow aperture, an outflow nozzle in communication with the chamber, and a volume displacement member inside the chamber. The volume displacement member is cyclically movable between a low-volume state and a high-volume state at a frequency F, wherein a displacement volume of blood Vd is displaced from the chamber through the nozzle during each cycle. When the volume displacement member moves at frequency F, the device increases momentum of blood flowing through the device such that flow rate of blood exiting the nozzle is substantially greater than the frequency F multiplied by the displacement volume Vd. In some embodiments, the volume displacement member includes a balloon having a proximal region that is distanced from an inner wall of the chamber more than a distal region of the balloon when the balloon is fully inflated.

An implantable medical device includes a functional unit, an introducer unit for introducing and/or navigating the functional unit in a lumen of body conduit(s) of a subject, and an elongated operable element connectable to a controller for operating the functional unit though the elongated operable element in a lumen of body conduit(s) of the subject. The functional unit, introducer unit, and elongated operable element may be in a slidable relationship for assembling and unassembling the implantable medical device in vivo. The implantable medical device is implantable, explantable, and operable in a lumen of body conduit(s) of a subject according to related methods.

An implantable medical device includes a functional unit, an introducer unit for introducing and/or navigating the functional unit in a lumen of body conduit(s) of a subject, and an elongated operable element connectable to a controller for operating the functional unit though the elongated operable element in a lumen of body conduit(s) of the subject. The functional unit, introducer unit, and elongated operable element may be in a slidable relationship for assembling and unassembling the implantable medical device in vivo. The implantable medical device is implantable, explantable, and operable in a lumen of body conduit(s) of a subject according to related methods.