Transcript Slide 1

NeoNurBT
Wireless Data Transfer and Analysis for Neonatal Feeding Device
Department of Electrical and Systems Engineering
Daniel Fleischer (EE ’12), Matthew Sternberg (SSE ‘12), & Aaron Roth (EE ‘12) – Team 7, 2012
Advisor: Dr. Jay Zemel (ESE) & Dr. Barbara Medoff-Cooper (Nursing)
Motivation: More than half a million premature births occur in the United States each year. Researchers at the Children's Hospital of Philadelphia (CHOP) and University of Pennsylvania School of Nursing are currently
analyzing the feeding behaviors of premature babies and how they relate to management of care and disease. The NeoNur system has been developed to measure, process and store sucking pressures and breathing data.
The current system requires connection to a desktop computer via a serial to USB cable for processing and display. Our redesigned NeoNur system incorporates a wireless serial module that enables data transfer to
Bluetooth-enabled tablets. Additionally we developed a mobile application that allows the feeding data to be easily transferred from the NeoNur and displayed as a graph along with key data analysis metrics. This allows
nurses to quickly and easily analyze the feeding data and determine if disease symptoms are present. The NeoNur has future applicability in hospitals throughout the United States, other first world countries, and third world
countries. In using this device, nurses will have the information they need to help save many premature babies around the world.
User Interface
System Overview
When the user opens the application, the tablet will automatically
begin searching for the NeoNur. When the tablet is connected via
Bluetooth, the user will be notified by a popup as well as a green light on
the device. With one touch, the application will download and process the
data as well as display the results in graphical form for the user. If the user
would like additional data, they may check the boxes on the interface to
display analysis metrics, including maximum pressure, sucks per burst,
time between bursts, and breathing rate.
Hardware
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Previously, the procedure
to test feeding patterns
could only be carried out in
the laboratory setting taking
approximately 35 minutes
to complete. By decreasing
the form factor of the
device, we were able to
retrofit the circuit board to
fit within a standard baby
bottle and decrease that
time to 10 minutes.
600
500
A BlueSMiRF Gold Bluetooth cable replacement was used to
connect an HTC flyer tablet to the NeoNur bottle to enable wireless
data transfer. New circuit boards for the bottle were designed using
EAGLE CAD software and milled on the LPKF PCB Milling Machine
400
Figure 5: Cutting circuit board with PCB Milling Machine
300
Hardware and production software:
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200
100
0
250.208 125.888 147.904 121.024
140.48
Maximum Sucking Pressure:
114.08
109.248 106.432 106.432 121.024 106.432 108.448
8.9 kPa
Average Sucks/Burst:
3 S/b
Avg. Time Between Bursts:
3 sec
99.584
Average Sucking Rate:
Average Breathing Rate:
116.16
114.08
116.16
Figure 2: NeoNur System including Tablet and Bottle
25 s/min
47 b/min
Reset
Quit
Download Data
The application is compatible with any
Android tablet running SDK 2.2 or newer. It
was demonstrated on a 7” HTC Flyer tablet.
The NeoNur system consists of a retrofitted baby bottle as well as a
tablet computer with the NeoNur application. The application is
programmed to recognize the NeoNur bottle upon launch. The system
operates as shown below:
NeoNur
Figure 1: NeoNur Graphical User Interface (GUI)
Additionally, the data is saved in a
human readable format on the tablet’s
internal memory before any transformations
are performed in order to preserve the
integrity of the data, and allows the data to
be erased from the NeoNur for the next
feeding session. Each reading is tagged
with the date and time of the feeding but
lacks any nominal identification in order to
comply with HIPPA guidelines.
Production Software:
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Data Processor
Feeding Apparatus
Figure 3: Previous Neonatal Feeding Unit at CHOP
104.416 104.416 118.912 109.248
Eclipse IDE
Android ADT Plugin
Android SDK 2.2 (API 8)
Java SE6 JDK
HTC Flyer specs:
• Size: 7.7x4.8x0.52”
• Screen: 7” (diagonal)
• Bluetooth 3.0 with A2DP
• Battery: Rechargeable 4000 mAh
• Storage: 32 GB + micro SD
• RAM: 1 GB
• USB: Standard micro-USB
Pyroelectric
Breathing
Sensor
PIC18f14k50
Microcontroller
Tablet Computer
Piezoelectric
Pressure
Sensor
Graph Data
Streams
AT25P
Flash Memory
BlueSMiRF
Gold Bluetooth
Module
Tablet
Bluetooth
RFCOMM
Display Key
Analysis
Metrics
Transform Data
Streams
Analyze Data
Streams
Temporary
Data Storage
Data saved to
Internal
Memory
Figure 4: System Block Diagram (Hardware components are shown in blue, software components are shown in red)
CadSoft EAGLE circuit CAD
LPKF CircuitCAM
BoardMaster CAM software
LPKF S62 PCB Milling Machine
BlueSMiRF Gold - serial cable
replacement
Figure 6: NeoNur circuit board designed in EAGLE CAD
BlueSMiRF Gold specs:
• Size: 2.03x0.62x0.22”
• Class 1 Bluetooth radio
(0.15x0.6x1.9“)
• 100m range
• 25mA power consumption
• Serial TTL @ 2400-115200 bps
Figure 7: BlueSMiRF Gold
Applications
The NeoNur platform can be scaled for use across the United
States and the world. Due to the low cost components and open
source development platform, the system can be applied to both
first and third world settings in order to make an impact on the
mortality rates among premature neonates.
Additionally,
the redesigned
system allows
nursing teams to
easily carry the
device with them
in order to
achieve these
goals.
Figure 8: Percentage of births born preterm by continent (Time Magazine, 2007)