Heartus Pumpus: A Pediatric Artificial Heart Design
The device will be a modified form of a pulsatile ram pump similar to a Hag fish heart. It will consist of four magnets, outer shell, inner wall, a central chamber, and an electric motor. The speed of the electric motor will determine pulse rate. The magnets will propel the ram into either chamber generating the pressure gradient.
The basis of this device is to have two chambers, one for the pulmonary circulation and the other the systematic circulation. Each chamber is between the outer shell and inner wall made of neoprene, a rubber-like material. The internal mechanical components are encased by a neoprene covering, which can endure repeated stretching. To generate the pressure gradients the device will decrease the volume of a chamber, forcing blood to the pressure desired before it is ejected (in the correct direction with the use of valves).
To provide oscillating movement, two more magnets will be in the center chamber connected to an axle driven by our electric motor. These magnets orientation will be to attract each other, so one side will have North Pole facing out while the other South Pole facing out. Both magnets on the ends of the rod will have their South poles facing towards the center. So the center North face will always attract the edges of the rod while the center South face will always repel. As the center rotates 180 degrees, the rod will oscillate the opposite direction. The rod is fixed to a perpendicular, one dimensional movement from the center of the two chambers and magnets.
The axle speed, in RPM, will determine how fast the pulse rate is. There will be one rotation per pulse. The electric motor will rotate through a gear reduction and rotate the axle connected to the central magnets. The gear reduction will be such that a small electric motor can provide the torque necessary to turn the inside magnets at the expense of RPM.
The 502 Slytherin Design Team consisted of: Chad Thompson, Simone Goines, Sonia Kinra, Rachel Schafer, Elsie Ponce, Melissa Giese, and Ashley Labonte
The basis of this device is to have two chambers, one for the pulmonary circulation and the other the systematic circulation. Each chamber is between the outer shell and inner wall made of neoprene, a rubber-like material. The internal mechanical components are encased by a neoprene covering, which can endure repeated stretching. To generate the pressure gradients the device will decrease the volume of a chamber, forcing blood to the pressure desired before it is ejected (in the correct direction with the use of valves).
To provide oscillating movement, two more magnets will be in the center chamber connected to an axle driven by our electric motor. These magnets orientation will be to attract each other, so one side will have North Pole facing out while the other South Pole facing out. Both magnets on the ends of the rod will have their South poles facing towards the center. So the center North face will always attract the edges of the rod while the center South face will always repel. As the center rotates 180 degrees, the rod will oscillate the opposite direction. The rod is fixed to a perpendicular, one dimensional movement from the center of the two chambers and magnets.
The axle speed, in RPM, will determine how fast the pulse rate is. There will be one rotation per pulse. The electric motor will rotate through a gear reduction and rotate the axle connected to the central magnets. The gear reduction will be such that a small electric motor can provide the torque necessary to turn the inside magnets at the expense of RPM.
The speed of the electric motor will be determined by an artificial pacemaker that monitors the oxygen levels of the patient. The power supply will be provided by an implantable battery that is charged wirelessly from a larger battery outside of the body via magnetic induction. This technology is known as transcutaneous energy transfer. This allows for practical life applications like showering so that the larger power source does not have to be worn all the time.
The 502 Slytherin Design Team consisted of: Chad Thompson, Simone Goines, Sonia Kinra, Rachel Schafer, Elsie Ponce, Melissa Giese, and Ashley Labonte
posted by Rachel at 8:31 PM
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