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Centrifugal Pump for Neuroendoscopy

Centrifugal Pump for Neuroendoscopy. Client: Joshua E. Medow, MD, Department of Neurological Surgery Advisor: William L. Murphy, PhD Team: Jenna Spaeth, Team Leader Kellen Sheedy, Communicator Laura Piechura, BWIG Holly Liske, BSAC. Neuroendoscopy.

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Centrifugal Pump for Neuroendoscopy

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  1. Centrifugal Pump for Neuroendoscopy Client: Joshua E. Medow, MD, Department of Neurological Surgery Advisor: William L. Murphy, PhD Team: Jenna Spaeth, Team Leader Kellen Sheedy, Communicator Laura Piechura, BWIG Holly Liske, BSAC

  2. Neuroendoscopy Jenna: Could you please add references for the photos? Also, the picture on the right was pretty low resolution on the overhead – is there another one that could replace it? Otherwise, this slide looks pretty cool  During neurosurgery, an endoscope provides real-time imaging of the cranial surface and a port for introducing surgical instruments

  3. Problem Definition • A non-peristaltic flow of saline over the cranial surface clears debris for visualization of the surgical field • Flow is disrupted with the introduction of surgical instruments • 30-75% change in flow rate • Flooding and poor visibility

  4. Neuroendoscopy

  5. Client Requirements • Centrifugal pump modulates saline flow • Bio-Pump®, Bio-Console®, flow sensor

  6. Design Specifications • Develop electrical interface of neuroendoscope and Bio-Pump®: • Bio-Pump® flow rate: • Current = 5.00 L/min • Desired = 0.15 L/min • Negative feedback: • Control of saline flow rate with insertion of surgical instruments • Adjustable flow and equilibration rates • Optimal flow rate = 85-115 mL/min • Error ≤ 10 mL/min

  7. Differential Amplifier Design Inverting operational amplifiers Noninverting operational amplifier Differential amplifier

  8. VC Vdiff VS

  9. Differential Amplifier Design Advantages Disadvantages • Adjustable response through amplifier and potentiometer selection • Simplicity • Potential for negative voltage output from differential amplifier • Minimal adjustment of feedback rate

  10. Comparator Design Magnitude comparator Bipolar transistors Inverting operational amplifiers Noninverting operational amplifiers Summing amplifier

  11. Vs Vs<Vc Vs=Vc Vs>Vc V1 V2 VΣ V3

  12. Vs Vs<Vc Vs=Vc Vs>Vc V1 V2 VΣ V3

  13. Vs Vs<Vc Vs=Vc Vs>Vc V1 V2 VΣ V3

  14. Disadvantages Comparator Design Advantages Adjustable feedback rate Resilience to all comparisons of Vs and Vc Smooth equilibration • Relative complexity

  15. Design Matrix

  16. Preliminary Testing

  17. Future Work • Select components to optimize feedback • Purchase and assemble components • Integrate with existing equipment • Test and evaluate design • Monitor flow rate with introduction of surgical instruments • Develop customized control of Bio-Console®

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