Board 551 - Technology Innovations Abstract Modifying MegaCode(r) Kid: Adding Chest Rise (Submission #221)

Introduction/Background HealthCare Simulation South Carolina (HCSSC) owns several VitalSim® manikins that do not have the capability for chest rise. However, these manikins have breath sounds. When HCSSC developed a particular need for a child manikin with both chest rise and breath sounds, but did not have the funds to purchase a new simulator, the simulation specialists at the Medical University of South Carolina (MUSC) Healthcare Simulation Center developed a method for adding chest rise to an existing MegaCode Kid®. Methods To create synchronized chest rise with the existing breath sounds in MegaCode® Kid, the MUSC simulation specialists created a circuit that “listens” for breath sounds and subsequently triggers a solenoid to inflate a SimMan replacement breathing bladder under the MegaCode® Kid’s chest skin. The circuit is comprised of the following components. Note: Components are standard and can be purchased from various outlets; prices are estimates: 1 LM224 Quad Operational Amplifier (Op-Amp) $0.25; 1 LM258 Dual Operational Amplifier (Op-AMP) $0.50; 2 LM555 Timers @ $0.20 = $0.40; 1 SPDT Reed Relay $3.00; 2 Solenoid Switches $0.0*; 1 NML0512 DC/DC converter $13.00; Miscellaneous resistors, capacitors and potentiometers $10.00 (*taken from existing supply of SimMan 2G solenoids). In addition to the components needed for the breathing circuit, a Laerdal replacement breathing bladder was used ($40.00). The total cost is less that $100. The attached image shows the wiring diagram for the breathing circuit. The breathing circuit is connected parallel to the input signal at one of the MegaCode® Kid lung speakers. That signal is connected to a high impedance differential amplifier with the output fed to an AC coupling inverting amplifier. That signal is fed to a comparator with hysteresis to prevent chatter. The output was fed to a blanking pulse generator, which was connected to a voltage follower. The voltage follower closes the N.O. reed relay. The reed relay triggers the 555 timer, which creates a short trigger pulse to a second timer. The second timer controls the time that the inhale solenoid is activated. The exhale solenoid is active when the inhale solenoid is inactive to allow the attached breathing bladder to deflate. The solenoids are attached to a SimMan® replacement breathing bladder, which is placed under the chest skin. To provide more realism of chest movement, a buffering layer was created using a folded defibrillator pad. Although this modification was developed at the MUSC center for MegaCode® kid, the same circuit could be applied to a variety of VitalSim® manikins. Results: Conclusion The modified Megacode® Kid has been used at the MUSC center during simulations requiring a breathing child-sized manikin. The cost to convert the Megacode® Kid was significantly lower than purchasing a new manikin with chest rise. Disclosures SimTunes Inc. - non-majority owner, Licensing outlet for Medical University of South Carolina simulation content, zero net revenue to date Laerdal Medical Corporation-receive royalties related to patent in simulation, COI management policy in place at MUSC.