Embedded Files
The final design is a highly portable and adjustable device that is designed specifically to perform high quality compressions inside the NICU
CAD Model of Final Design, and Real-Life Counterpart
Stand
A Sturdy Foundation
Easily maneuverable to avoid impeding caregivers when compressions are not required
Locking handles for rapid adjustment
Steel and gussets plates form rigid base for compressions
Stand does not 'walk' from original position when compressions applied
Technical Specs
Comprised of a variety of 80/20 Aluminum T-slot commercial off-the-shelf components
Reinforced with laser-cut steel gussets
Maximum +0.25" vertical deflection of actuator cantilever tip when fully loaded
Actuator
Actuator
The Heart of the Device
Performs compressions at proper depth and frequency
Compact profile ensures nurses maintain lines of sight to the newborn
Arduino controlled
Technical Specs
Festo Electric Cylinder, MPN 8118271
24V 3A
Linear speed: 210mm/s
50mm stroke
Transition Device
Transition Device
How it Works:
Operates by placing fingers on Applicator wings for manual compressions
During manual CPR, the spring force of the baby is used to return the applicator to its initial position
When powered compressions begin, an interference fit created by an O-ring locks the shaft and applicator together; allowing the two to move in tandem.
At All Times:
Linear Encoder tracks applicator position
- Recorded motion profile can be used for powered compressions
This provides an extra degree of safety, and assists with device acceptance!
24-bit Binary Signal Output Of Caliper to Arduino Serial Monitor
The encoder, a repurposed digital caliper, outputs its position data as a 24-bit binary signal. This data can then be used to create a motion curve that will be applied by the stepper motor onto the patient.
In the future, it is recommended that a linear encoder with less dynamic noise be utilized, as the output from the digital caliper used was unusable after significant smoothing.
Demonstration of Applicator Bayonet Systems
A Gentle Touch
The end effector of the device is comprised of a flexible plastic plate encased in soft silicone
With minimal lubrication, the applicator avoids excessive damage to the chest skin of neonates
Cross-Section of Silicone Applicator With Encased Plate
Operation Timeline
Operation Timeline
Nurse is applying compressions
Roll device up to bed
Adjust starting height
Nurse applies compressions on the applicator
Device records compression depth and frequency
Actuator performs compressions at the same depth and frequency of nurse
Compressions end when breathing has returned
Summary of Performance
Summary of Performance
Tracked Compression Depth from Laerdal Resusci Baby Mannequin
Deficiencies in the second/middle stroke were addressed with further controls tuning. Yellow arrows indicate lacking compressions.
The resuscitator was able to complete the following tasks:
Apply compressions at a rate of 120 compressions per minute and at a depth of ~40mm
Pause every three compressions to allow for respirations
Do all of the above without obstructing the NICU personnel
Page updated
Report abuse