Pediatric VAD by Gryffindor 501
Firebolt Pump with Novel Technique to Create Pulsatile Flow
by Gryffindor - 501
Farida Akberali, Risa Aprilria, Kristina Barsten, Nicholas Brown, Cody Covington, Christine Elkins, Mark Felder, Lauren Fife
by Gryffindor - 501
Farida Akberali, Risa Aprilria, Kristina Barsten, Nicholas Brown, Cody Covington, Christine Elkins, Mark Felder, Lauren Fife
Pump design background:
- Based off of current technology from the Hemopump Cardiac Assist System and the Impella by Abiomed
- Both devices are used to assist/unload the heart
- Very small; can be implanted in the heart by a catheter inserted into the femoral artery
- The tiny pump uses axial flow to reduce myocardial workload and oxygen consumption, while increasing cardiac output, coronary- and end-organ perfusion
- All parts are made out of titanium
- The impeller is magnetically levitated in the middle of the shell
- reduces hemolysis
- no "wear and tear"
- Parts are shell, front magnetic bearing, impeller, rear magnetic bearing, motor, and battery
- The device has a diameter of 4.5 mm, length of 55 mm, and weight of 15 g.
- Can generate:
- Flow rate of 0.5 - 3.2 L/min
- Pressure of 100 - 140 mmHg
- Angular velocity of impeller is 19,000 - 22,000 rpm
- Requires a power of 3.5 - 4.2 Watts
- Designed for patients over 10 kg
- Inserted into the left ventricle and stabilized just above the aortic valve
- A strand of muscle will be wrapped around the aorta, just above the pump, to create a pulsatile flow
- Left latissimus dorsi will be cut where it terminates on the side of the ribs under the shoulder and peeled back until there is a strand 0.75 - 1 inch wide; do not denervate or detach the muscle
- Encircle the muscle around aorta and suture the free end to the strand so that it sits snuggly around the aorta without compressing it
- Insert the electrode from a modified pacemaker for muscular stimulation
- The chosen pacemaker is a Cardiomyostimulator Medtronic Model 4,710 Transform
- The pacemaker should be positioned in the left abdominal wall pocket
- One lead is connected to electrode and another to the pump
- The pacemaker will act as an integrating signal that integrates flow measurements and frequency of stimulation needed to increase/decrease pulsatility rate
- A voltage of 3.5 V is needed for stimulation of the muscle
- The muscle has a resistance of 200 ohms, therefore the necessary power is 0.06125 Watts
- This power will create a pulse of 95 bpm
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