Team Guide - Dr. Daniel Phillips Project Sponsor - Dr. Michel Berg Team Members Alan StrandburgChris...
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Transcript of Team Guide - Dr. Daniel Phillips Project Sponsor - Dr. Michel Berg Team Members Alan StrandburgChris...
Team Guide - Dr. Daniel Phillips
Project Sponsor - Dr. Michel Berg
Team MembersAlan Strandburg Chris AbramoNtongho Amin Gordon Yeung Nick Columbare Albert Lam
Automatic Home Medication Dispenser
Project # P07009
Project Background
• Warfarin is an anticoagulant used for blood clotting medical conditions.
• Dosages of Warfarin need to be frequently adjusted to maintain effectiveness.
• For the first few months of the regimen, adjustments are made based on weekly or bi-weekly blood test results. This requires frequent coordination with the physician, patient and pharmacist.
Problem Statement
• Frequent coordination between the physician, patient, and pharmacist is – Time consuming– Inconvenient– Increases chance of dosage error
Solution: A real-time adaptive system needs to
be developed.
Fundamental Concept
• Using a computer, the doctor programs the daily dosages for the patient.
• This schedule is sent through the internet and connects to the automatic pill dispenser.
• At a designated time, the unit will sound an alarm, reminding the patient to take his/her medication.
• User pushes a button and the correct combination of pills are dispensed.
• Patient brings device to the pharmacist to be refilled.
Objective/Scope
• Create a prototype Warfarin dispensing device
• Unit used for demonstration of concept
• Must reliably dispense medication in accurate doses
• Communicates with physician via a computer interface
• Equipped with operating checks and alerts
• Easily refillable by the pharmacist
• Easy to use and simple user interface
• Spill-proof design
• Minimize future manufacturing cost
Friction Hinges / Vented Assembly
• Friction hinges– Supports weight of lid– Cover can be rotated and
held open at various positions
– Prevents the lid from violently dropping closed
• Outer housing – Easily removed for
maintenance and cleaning– Four screws fasten the
outer housing to the unit– The case mounted
electronics are harnessed to facilitate removal
– Venting the housing offers ample convective cooling for the electronics.
Slotted Tubes• Tube Configuration
– Consistent orientation – Minimized jamming / damage
to the pills• Slotted feature
– Directs pill following mechanism
• Material requirements – Rigid– Corrosion resistant– Machinable – Manufactured in seamless
tubing – 9mm inner diameter
• Stainless steel tubes were determined to satisfy these requirements.– Original material – polycarbonate
Stainless Steel Plates
• Machined from stainless steel• Material selection
– Durability – Reduction of sliding friction
Micro-Servos• Original design used larger
servo-motors – Design deficiencies
• Separate mounting platform
• Clearance and alignment liabilities
• Required more operating space
• Final Design used micro servo-motors– More compact and efficient– Pushing motion – Eliminated the need for a
separate mounting platform
– Reduced the size, complexity, machining time, and cost of the unit
Power- Battery powered by 7.2V Lithium Ion.
- Also accepts wall power.
- Voltage is regulated to 5Vdc.
- Battery recharged using a MAX745 smart Lithium Ion recharging chip.
- The chip supplies a regulated charging current of 4A to the battery.
Speaker Amplifier
R410
0
R510k
Speaker8
C10242ufC11
.05uf
3
25
6
14 87
+
-
U1
LM386
C12
4.7uf
R610
VCC
GPIO Pin 29
Headphone Jack
GPIO pin 35
Functional Block Diagram
WallPower
LCD Screen
CONNECTOR GPIO
A B
Thermistor
C
I
G
D
Flat Ribbon Cable
EF
Amplifier
HMessage Button
Dispense Button
J
J
L
L
Battery
CupDetectSwitch
Audio Outlet
Power Jack
50 pins LCD interface
CONNECTOR A CONNECTOR B
K
M
Serial Port
N
Motor 1 Motor 2 Motor 3
Message LED
Motor 4
Dispense LED
Motor 5 Motor 6
Speaker
SV203Controllerboard
O
P
Motor Control
U 9 A
7 4 L S 0 4
12
Motor 1 Motor 2 Motor 4Motor 3 Motor 5 Motor 6
C O N S 2 P in 1C O N S 1 P in 1 C O N S 4 P in 4C O N S 3 P in 3 C O N S 6 P in 6C O N S 5 P in 5
C O N B 2 P in 1 2C O N B 2 P in 1 1 C O N B 2 P in 1 0C O N B 2 P in 9 C O N B 2 P in 8C O N B 2 P in 7
BlkBlk BlkBlk W BlkBlk W W W W W
RedRedRed RedRedRed
C O N B 2 P in 1 6C O N B 2 P in 1 3 C O N B 2 P in 1 8C O N B 2 P in 1 5C O N B 2 P in 1 4 C O N B 2 P in 1 7
V C C
0
S e ria l P o rt P in 7
C O N J 3 P in 9
SV203 PONTECHCONTROLL BOARD
C O N J 1 P in 5
Pill Slide
Consists of two angles:– Primary slide angle
• angle at which all the pills would slide at– Secondary slide angle
• allows pills from the outermost tubes to be moved towards the center of the unit and into the cup
• Angles were researched and tested to ensure that the pills would not become stuck after they are ejected from the pill plates
Pill Follower Assembly
• Meets the customer requirement of being spill proof• Spring
– provides sufficient force to keep pills from disorienting when unit is inverted
• Self contained one-piece unit
Pill Loading Device• Loading Device
– Relatively quick loading with short initial learning curve
– Pills poured into the funnel and are stacked within the polycarbonate tube
– Release pin stops pills at end of tube
– Using slot as guide, mechanism is lowered over SS tubes
– Pin is released and pills fall into tube
– Maintains consistent and reliable pill orientation
Handle with Sensor Switch
• Modeled in vision of customer provided example• Presence of handle is detected through micro-
switch• Secured through locking grab catch• Stability in unit
Accomplished Design Requirements
ME Requirements:• Enable one pill to be moved from a bulk
compartment to delivery compartment at a time.• Contain one month supply of Warfarin. • Enclosed and latched with tamper evident
indicator.• Deliver correct dose without error.• Rapid delivery of dose after dose button push.• Quickly demonstrable.• Loading of device done easily and quickly.• Spill-proof.• Large / easily visible buttons for dose retrieval
and information.• Reasonably quiet. • Easy to use latching cup handle.
Accomplished Design Requirements
EE Requirements:• Backlit color screen with large characters for
messages.• Rapid delivery of dose after dose button push.• Quickly demonstrable.• Alert for service when pill supply is low.• Delivery compartment with removable dose cup
needs to be in place prior to dispensing. • Audio/visual alarm to alert patient that it is time
to take medication.
Accomplished Design Requirements
CE Requirements:• Remote dose programming through interactive
software interface.• Programmable messages from programmer to
dispenser.• Rapid delivery of dose after dose button push.• Update dosing information by physician.• Quickly demonstrable.• Alert for service when pill supply low.• Audio/visual alarm to alert patient that it is time
to take medication.