A cardiocirculatory aiding device is disclosed generally comprising a housing with a cavity, an inlet, an outlet, and first and second sides with apertures therein, first and second shells mounted to the sides of the housing, and first and second membranes disposed between the housing and the shells
A cardiocirculatory aiding device is disclosed generally comprising a housing with a cavity, an inlet, an outlet, and first and second sides with apertures therein, first and second shells mounted to the sides of the housing, and first and second membranes disposed between the housing and the shells such that the membranes cover the apertures in the sides of the housing, thereby creating a central blood chamber and two outer gas chambers. A pump supplies gas through a duct into the gas chambers to cause the membranes to flex into the blood chamber to pump the blood in that chamber through the outlet. In some embodiments, the pump is external and the duct passes through an incision in the body. In some embodiments, the membranes are elastomer membranes.
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What is claimed is: 1. A method of aiding cardiac circulation, the method comprising: providing a housing having a cavity therein, a first sidewall with an outer surface, a first hole passing through the first sidewall into the cavity, a second sidewall with an outer surface, a second hole passing
What is claimed is: 1. A method of aiding cardiac circulation, the method comprising: providing a housing having a cavity therein, a first sidewall with an outer surface, a first hole passing through the first sidewall into the cavity, a second sidewall with an outer surface, a second hole passing through the second sidewall into the cavity, an inlet for communicating blood into the cavity, and an outlet for communicating blood out of the cavity; positioning a first membrane against the outer surface of the first sidewall of the housing such that the first membrane covers the first hole, the first membrane being substantially flat in an unflexed position, and positioning a second membrane against the outer surface of the second sidewall of the housing such that the second membrane covers the second hole, the second membrane being substantially flat in an unflexed position, such that the housing and the first and second membranes at least partially define a blood chamber; mounting a first shell having a concave inner surface to the outer surface of the first sidewall of the housing such that the first membrane and the concave inner surface of the first shell at least partially define a first gas chamber; mounting a second shell having a concave inner surface to the outer surface of the second sidewall of the housing such that the second membrane and the concave inner surface of the second shell at least partially define a second gas chamber; connecting a first end of the gas duct to the housing such that the duct is in fluid communication with said first and second gas chambers; and connecting a second end of the gas duct to a pump; and using the pump to communicate gas into the first and second gas chambers via said gas duct to cause said first and second membranes to flex through said first and second holes, respectively, and into the blood chamber and pump blood in the blood chamber through the outlet. 2. The method of claim 1, further comprising positioning the housing in a human body and positioning the pump outside of the human body. 3. The method of claim 2, further comprising connecting the inlet of the housing to an atrium. 4. The method of claim 1, further comprising controlling the volume flow of the blood pumped through the outlet by controlling the frequency at which the pump supplies the gas to the first and second gas chambers. 5. The method of claim 1, further comprising controlling the volume flow of the blood pumped through the outlet by controlling the amount of gas supplied to the first and second gas chambers by the pump. 6. The method of claim 1, wherein said first and second membranes comprise elastomer membranes. 7. A cardocirculatory aiding device, comprising: a housing having a generally bulbous profile, a substantially flat first sidewall with a hole passing therethrough and having an outer surface, and a substantially flat second sidewall with a hole passing therethrough and having an outer surface; a first shell with a concave inner surface mounted to the outer surface of the first sidewall of said housing; a second shell with a concave inner surface mounted to the outer surface of the second sidewall of said housing; a first membrane sandwiched between said first shell and the outer surface of the first sidewall of said housing such that said first membrane covers said first hole, said first membrane comprising an elastomer sheet having inner and outer side surfaces that is substantially flat in an unflexed position; a second membrane sandwiched between said second shell and the outer surface of the second sidewall of said housing such that said second membrane covers said second hole, said second membrane comprising an elastomer sheet having inner and outer side surfaces that is substantially flat in an unflexed position; wherein the first shell is mounted to the outer surface of the first sidewall of said housing via a first plurality of fasteners passing through the perimeter of said first shell, through the perimeter of said first membrane, and into the outer surface of the first sidewall of said housing, and the second shell is mounted to the outer surface of the second sidewall of said housing via a second plurality of fasteners passing through the perimeter of said second shell, through the perimeter of said second membrane, and into the outer surface of the second sidewall of said housing; wherein an inner surface of said housing and the inner side surfaces of said first and second membranes define a blood chamber, the outer side surface of said first membrane and the concave inner surface of said first shell define a first gas chamber, and the outer side surface of said second membrane and the concave inner surface of said second shell at least partially define a second gas chamber; an inlet and an outlet that communicate blood into and out of the blood chamber; a gas duct in fluid communication with said first and second gas chambers; and a pump connected to said gas duct, wherein said pump communicates gas into said first and second gas chambers via said gas duct that causes said first and second membranes to flex through said first and second holes, respectively, and into said blood chamber to pump blood in the blood chamber through said outlet. 8. A cardiocirculatory aiding device, comprising: a housing having a cavity therein, a first sidewall with an outer surface, a first hole passing through the first sidewall into the cavity, a second sidewall with an outer surface, and a second hole passing through the second sidewall into the cavity; first and second shells mounted to the outer surfaces of the first and second sidewalls of said housing, respectively, said first and second shells each having a concave inner surface; a first membrane sandwiched between said first shell and the outer surface of the first sidewall of said housing such that said first membrane covers said first hole, said first membrane being substantially flat in an unflexed position, said first membrane and the concave inner surface of said first shell at least partially defining a first gas chamber; a second membrane sandwiched between said second shell and the outer surface of the second sidewall of said housing such that said second membrane covers said second hole, said second membrane being substantially flat in an unflexed position, said second membrane and the concave inner surface of said second shell at least partially defining a second gas chamber; wherein said housing and said first and second membranes at least partially define a blood chamber; an inlet and an outlet that communicate blood into and out of the blood chamber; a gas duct in fluid communication with said first and second gas chambers; and a pump connected to said gas duct, wherein said pump communicates gas into said first and second gas chambers via said gas duct that causes said first and second membranes to flex through said first and second holes, respectively, and into said blood chamber and pump blood in the blood chamber through said outlet. 9. The device of claim 8, further comprising unidirectional valves for controlling flow through said inlet and said outlet. 10. The device of claim 9, wherein: said housing has a top end and a bottom end; said inlet and said outlet are located at the top end of said housing; and said gas duct is connected to said housing at the bottom end of said housing. 11. The device of claim 10, wherein each of the first and second sidewalls of said housing are substantially flat and have a generally bulbous profile, such that the width of each of the first and second sidewalls gradually decreases at the bottom end of said housing. 12. The device of claim 10, wherein said housing has a width that gradually decreases towards the bottom end of said housing. 13. The device of claim 8, wherein said pump comprises an electro-pneumatic unit that produces a pulsed gas supply. 14. The device of claim 13, wherein the frequency of said pulsed gas supply is variable. 15. The device of claim 14, wherein the frequency of said pulsed gas supply is variable both manually and automatically. 16. The device of claim 8, wherein said first and second membranes comprise elastomer membranes. 17. The device of claim 16, wherein said elastomer membranes comprise a silicon elastomer. 18. The device of claim 8, wherein said first and second shells are mounted to the first and second sidewalls of said housing via a plurality of fasteners arranged along the perimeters of said shells. 19. The device of claim 8, wherein the inner concave surfaces of said first and second shells are substantially spherical. 20. The device of claim 8, wherein said housing comprises polyoxymethylene. 21. The device of claim 8, wherein said device has only one inlet through which blood enters said blood chamber and only one outlet through which blood exits said blood chamber. 22. The device of claim 8, further comprising a haemocompatible duct connected to said inlet for connecting said housing to an atrium. 23. The device of claim 8, wherein said pump comprises a flexible manual pump. 24. The device of claim 8, wherein said duct comprises a flexible plastic material.
Broen, Kenneth E.; Brown, Corey D.; Evans, Don W. E.; Hansen, David J.; Mickelson, Anne F.; Nazarian, Richard A., Portable controller and power source for mechanical circulation support systems.
Bachman, Timothy A.; Bolyard, Nathan J.; Brown, Corey D.; Evans, Don W. E.; Knipfer, Michael A.; Nazarian, Richard A., Portable controller with integral power source for mechanical circulation support systems.
Bolyard, Nathan J.; Evans, Don William Eldon; Maniak, Jeremy J.; Broen, Kenneth E., Portable controller with integral power source for mechanical circulation support systems.
Bolyard, Nathan J.; Evans, Don William Eldon; Maniak, Jeremy John, Portable controller with integral power source for mechanical circulation support systems.
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