P14006 Bath Tub Lift Phase II Review - Rochester Institute of...
Transcript of P14006 Bath Tub Lift Phase II Review - Rochester Institute of...
P14006 Bath Tub Lift Phase II Review Amos Baptiste Jeremy Czeczulin Andrew Hughes Richard Prilenski
Introductions Name Major/Role
Amos Baptiste Industrial & Systems Engineer/Team Leader
Jeremy Czeczulin Mechanical Engineer
Andrew Hughes Mechanical Engineer
Richard Prilenski Mechanical Engineer
Agenda • Phase I Overview
• Problem Definition • Customer & Engineering Requirements • Action Items • Customer Update
• Functional Decomposition • Concept Generation • Concept Selection • Project Plan (WK 6-9) • Team Assessment
P14006 Problem Statement • Bathtub lift – a device that provides assistance to an individual with
physical disabilities, including limited balance, coordination, or mobility
• Can reduce the difficulties of raising and/or lowering an individual into the tub by utilizing a powered seat and a simple control module
• As population grows the number of aged individuals will greatly increase making demand for assist devices increase
• Project motivation – Theresa Loce • Improve the current design • Current device does not meet her needs • Powered lift that is sturdy, comfortable, easy to use/clean, makes
minimal noise, and takes into account physical limitations of user • Ultimate goal – user maintains autonomy and privacy
Project Deliverables • Effectively assist the user for bathing purposes • Device is easy to access from starting position • Minimized operating time • Provide a comfortable and supportive seating area • Accessible to 10th-70th percentile for both genders, regardless
of age • Reasonably lightweight and portable, able to be transported
Current State • Current device is not stable; client
feels unsafe • Current model not in production • Parts have been replaced/fixed due
to wear & do not always work • User has difficulty accessing chair • New toilet device introduces new
design issues
Stakeholders Power
Interest
• Sonaris • Hoyer • Other Bath Tub
Manufacturers
• Wheel chair users/handicap
• Hospitals (RGH) • Nursing Homes • Suppliers/Vendors
(Southside Medical Supply)
• Theresa Loce • Elizabeth
DeBartolo • Art North • R.I.T
Action Items • Completed Since Phase I Review
• Updated & refined Customer and Engineering Requirements.
• Updated Risk Assessment by identifying owners and implementing a scoring system.
• Explored how the current device is cleaned. • Research battery power vs. water power
(hydraulic).
Customer Requirements Customer Need Importance Description
CN01 1 Chair turns 180-360 degrees
CN02 1 Chair has handles/armrests
CN03 1 Requires minimal setup
CN04 1 Comfortable and safe to use
CN05 1 Operates through a water-powered system
CN06 1 Sturdy attachment to tub; cannot move
CN07 1 Non-corrosive
CN08 1 Easy to use
CN09 1 Easy to clean
CN10 1 No use of Nickel - allergic
CN11 1 Able to lift at least 150 lbs
CN12 1 Accessible to 10th percentile women (height)
CN13 1 Controls/handles must be easy to use
CN14 1 Compatible with existing tub/system
CN15 2 Easy to maintain/fix
CN16 1 Takes 0-5 minutes to rise
CN17 2 Minimal noise
CN18 2 Flexible temperature control
CN19 1 Can recline to lay user flat in tub
CN20 2 Can fold down to fit in car
CN21 2 Lightweight
CN22 1 Partially/fully powered by battery (water alternative)
Engineering Requirements Number Source Function Specification (metric) Unit of Measure Marginal Value Ideal Value Comments/Status
S1 CN01/CN11/CN17 System Rotation of chair degrees 180 >= 180
S2 CN02/CN04/CN08/CN12/CN12/CN14 System Width of armrests in 17-19 17 1/2
S3 CN03/CN09/CN15 System Time to get device in/out of tub minutes 0-2 1
S4 CN04/CN12/CN14 System Correctly dimensioned seating area in^2 < 17 x 15 17 x 15 Must fit within tub
S5 CN03/CN04/CN05/CN06/CN08/CN11/CN13/CN14/CN16/CN17 System Uses faucet to raise client psi 30-80 60
S6 CN02/CN07/CN08/CN09/CN14 System Chair secured to tub using suction cups psi secure equivalent of
150 lbs secure equivalent
of 150-250 lbs
S7 CN02/CN07 System Long lasting material year 100-120 120-260
S8 CN04/CN15/CN08 System Time to engage hydro lift seconds 5-Jan 3-Jan
S9 CN04/CN07/CN09/CN10/CN15 System Material use, fixture design minutes 2-5 3
S10 CN02/CN04/CN10 System Concentration of nickel % 0 0 Client allergy
S11 CN11 System Lifting capabilities lbs 150 >= 150
S12 CN12/CN04 System Height of user in 58 - 62 60 Women's 10th percentile
S13 CN13/CN04 System Diameter of lever in 1.5 - 2.5 2
S14 CN14 System Dimensions of device/fixture in 18 - 19 19
S15 CN16 System Rising time minutes 5 <= 5
S16 CN17 System Noise dB 30 <= 30
S17 CN18 System Operates on wide range of temperatures Fahrenheit 70-110 60-130
S18 CN19/CN04/CN08/CN11/CN12/CN14/CN15/CN16/CN17 System Chair reclining ability degrees 40-90 90
S19 CN20/CN03 System Compact transport design ft^3 (LxWxH) 20-27(L) x 16-19(W) x 20-30(H)
25(L) x 17.5(W) x 30(H)
Dimensions restricted to tub size
S20 CN21/CN09 System Lightweight system design lbs 20-30 25
S21 CN22/CN01/CN04/CN08/CN13/CN19 System Device powered by battery V 12-15 13.2 Alternative to hydraulic
Engineering Matrix
Engi
neer
ing
Requ
irem
ent
Rota
tion
of c
hair
Wid
th o
f arm
rest
s
Tim
e to
get
dev
ice
in/o
ut o
f tub
Corr
ectly
dim
enio
ned
seat
ing
area
Use
s fa
ucet
to ra
ise c
lient
Chai
r sec
ured
to u
sing
suct
ion
cups
Long
last
ing
mat
eria
l
Tim
e to
eng
age
hydr
o lif
t
Mat
eria
l use
, fix
ture
des
ign
Conc
entr
atio
n of
nic
kel
Lift
ing
capa
bilit
ies
Heig
ht o
f use
r
Diam
eter
of l
ever
Dim
ensio
ns o
f dev
ice/
fixtu
re
Risin
g tim
e
Noi
se
Ope
rate
s on
wid
e ra
nge
of te
mpe
ratu
res
Recl
inin
g ab
lity
Com
pact
tran
spor
t de
sign
Ligh
twei
ght
syst
em d
esig
n
Devi
ce P
ower
ed b
y Ba
tter
y
# S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
Customer Need Priority #
Device turns at least +/- 90 degrees 1 CN01 x x
Device has handles/armrests 1 CN02 x x x
Requires minimal setup 1 CN03 x x x
Comfortable and safe to use 1 CN04 x x x x x x x x x x
Operated through a water-powered system 1 CN05 x
Sturdy attachment to tub; cannot move 1 CN06 x x
Non-corrosive 1 CN07 x x x
Easy to use 1 CN08 x x x x x x
Easy to clean 1 CN09 x x x x
No use of nickel - allergic 1 CN10 x x
Able to lift at least 150 lbs 1 CN11 x x x x
Accessible to 10th percentile women (height) 1 CN12 x x x x
Controls/handles must be easy to use 1 CN13 x x x x
Compatible with existing tub/system 1 CN14 x x x x x x x
Easy to maintain/fix 2 CN15 x x x x
Takes 0-5 minutes to rise 1 CN16 x x x
Minimal noise 2 CN17 x x x
Flexiblle temperature control 2 CN18 x
Can recline to lay user flat in tub 1 CN19 x x
Can fold down to fit in car 2 CN20 x
Lightweight 2 CN21 x
Partially/fully powered by water (altenrative) 1 CN22 x
Uni
t
Deg
in
min
in^2
psi
psi
year
sec
min
%
lbs in
in
in
min
dB
F deg
ft^3
lbs V
Customer Update • Follow up questions to initial interview • Explain the broadened project scope • Explain the new project direction • Obtain client opinion on system design
• Battery vs. hydraulic, rotate vs slide, etc. • New restrictions due to new bathroom setup
Functional Decomposition
Raise Device
Raise device
Engage switch
Water power Battery power
Transfer to Device
Transfer to the device
Get to device
Transfer/slide arms to device
Assist user's legs to device
Platform/seat extension comes
out
Rotate Device
Rotate device
Use battery Use water power
User manually rotates
Lower/raise device
Lower/raise device
Engage switch
Water power Battery power
Transition from Device
Transition from device
Rotate user Let user's legs down
Extensions lower
Get off device
Manually transfer from device
Lower device
Disengage switch
Morphological Analysis
1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane
2 Transfer DeviceGetting items for support (trapeze
handle)Use of crutches Automation to lift user to
the devicePersonal assistant to help
user to deviceIncorporate user's assist
device
3 Assist Legs ManuallyPersonal
Assistant to help legs be secured
Water power Battery power (platform slides out)
Remote control Reclining Platform
4 Rotate/Slide Device
Manually Water power Battery power Personal assistant Spring loaded Remote Control
5 Lower Device Water Power Battery Power Inflation Under chair Remote Control Magnetic Repulsion Chair Crane
6 Turn on Water to fill tub
Manually turn knob
Personal Assistant
Remote Control Relocate knobs
61 2 3 4 5Sub function
Solutions
Sub function
Solutions
Base Design
Base Design
1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion
Chair Crane
2 Transfer DeviceGetting items for support (trapeze
handle)Use of crutches Automation to lift
user to the device
Personal assistant to help
user to device
Incorporate user's assist
device
3 Assist Legs ManuallyPersonal
Assistant to help legs be secured
Water powerBattery power
(platform slides out)
Remote control Reclining Platform
4 Rotate/Slide Device
Manually Water power Battery power Personal assistant
Spring loaded Remote Control
5 Lower Device Water Power Battery Power Inflation Under chair
Remote Control Magnetic Repulsion
Chair Crane
6 Turn on Water to fill tub
Manually turn knob
Personal Assistant
Remote Control Relocate knobs
5 61 2 3 4Sub function
Solutions
Base Battery Design
Base Battery Design
1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion
Chair Crane
2 Transfer DeviceGetting items for support (trapeze
handle)Use of crutches Automation to lift
user to the device
Personal assistant to help
user to device
Incorporate user's assist
device
3 Assist Legs ManuallyPersonal
Assistant to help legs be secured
Water powerBattery power
(platform slides out)
Remote control Reclining Platform
4 Rotate/Slide Device
Manually Water power Battery power Personal assistant
Spring loaded Remote Control
5 Lower Device Water Power Battery Power Inflation Under chair
Remote Control Magnetic Repulsion
Chair Crane
6 Turn on Water to fill tub
Manually turn knob
Personal Assistant
Remote Control Relocate knobs
5 61 2 3 4Sub function
Solutions
Fully Battery Powered
Fully Battery Powered
1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion
Chair Crane
2 Transfer DeviceGetting items for support (trapeze
handle)Use of crutches Automation to lift
user to the device
Personal assistant to help
user to device
Incorporate user's assist
device
3 Assist LegsPersonal
Assistant to help legs be secured
Water powerBattery power
(platform slides out)
Remote control Reclining Platform
4 Rotate/Slide Device
Manually Water power Battery power Personal assistant
Spring loaded Remote Control
5 Lower Device Water Power Battery Power Inflation Under chair
Remote Control Magnetic Repulsion
Chair Crane
6 Turn on Water to fill tub
Manually turn knob
Personal Assistant
Remote Control Relocate knobs
5 61 2 3 4Sub function
Solutions
Crane Device
Crane Device
1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion
Chair Crane
2 Transfer DeviceGetting items for support (trapeze
handle)Use of crutches Automation to lift
user to the device
Personal assistant to help
user to device
Incorporate user's assist
deviceChair Crane
3 Assist LegsPersonal
Assistant to help legs be secured
Water powerBattery power
(platform slides out)
Remote control Reclining Platform
4 Rotate/Slide Device
Manually Water power Battery power Personal assistant
Spring loaded Remote Control No rotation/sliding
5 Lower Device Water Power Battery Power Inflation Under chair
Remote Control Magnetic Repulsion
Chair Crane
6 Turn on Water to fill tub
Manually turn knob
Personal Assistant
Remote Control Relocate knobs
5 6 71 2 3 4Sub function
Solutions
Concept Selection # 1 Criteria
Base (Existing) Design Base Battery Design Fully Battery Powered Design Crane Design
1 Raise Device + + +
2 Transfer Device S + +
3 Assist Legs S + +
4 Rotate/Slide Device - + +
5 Lower Device + + +
6 Turn on Water to Fill Tub S S +
7 Affordable - - -
8 Fits Time Constraints + - -
9 Safety - + -10 Light Weight - - -11 Portable - - -
+ 3 6 6- 5 4 5
DATU
M
Concept Selection # 2
Criteria
Base (Existing) Design Base Battery Design Fully Battery Powered Design Crane Design
1 Raise Device - S S
2 Transfer Device - - +
3 Assist Legs - - -
4 Rotate/Slide Device - - +
5 Lower Device - S S
6 Turn on Water to Fill Tub S S +
7 Affordable + + -
8 Fits Time Constraints + + -
9 Safety - - -10 Light Weight + S +11 Portable + S -
+ 4 2 4- 6 4 5
DATU
M
Risk Assessment ID Risk Item Cause Effect Likelihood Severity Importance Actions to minimize Owner
1 User injury due to falling/slipping off device
No adding arm rails. Combination of material, water and human skin not having enough friction causing user to slip.
Minor to severe injury to the customer/user 1 3 3 Implement a safety device and use high
friction materials Team
2 Moderate the water temperature
Water temperature is not properly set
User may sustain burns or experience cold temperatures 1 2 2 Test water before getting into the tub Team
3 Water power supply inconsistent
Psi level jump due to drop in water pressure
User may experience discomfort while operating device due to rough motions
1 1 1 Run a test to see if users water pressure is consistent Team
4 Electric power supply inconsistent
Charge from battery may not be sufficient to operate device when running low
User may experience longer operation times or may become trapped in tub
2 3 6 Apply a warning system/visual indicator that the battery is low. Team
5 Device weight capacity Device not able to lift well over the minimum requirement
Device fails under heavy loading, trapping and possibly injuring user 1 3 3 Through testing device must lift >150
lbs Team
6
Not being able to fulfill requirements of broad user base (height/weight differences)
Not conducting an ergonomics study on the stature of the users percentile and their reach
User may be too big or too small for device. User may get injured due to lack of space or not being able to reach certain items. Customer dissatisfaction
2 2 4
Have multiple team members measure the dimension of the tub and for every step of the process, re-measure to verify meeting constraints
Team
7 Fixture dimensions
Measurement errors of the bath tub and the device. Not considering thickness of materials in specs.
Device not able to fit in the tub. Customer not being able to use the device.
2 3 6
Have multiple team members measure the dimension of the tub and for every step of the process, re-measure to verify meeting constraints
Team
8 Safety of user’s legs When fixture is lowering it does not allow enough room for legs
Minor to sever injury to the customer/users legs 1 3 3
Apply a foot rest at the base of the device so the user can place their feet before operating
Team
9 Transfer from starting position to the device
Unsafe transition from starting position to the device Possible falling injury 1 3 3
Option1: Having the device being able to slide out the tub for the user to access. Option 2: Ensure that the device can rotate out of the tub and is stable for users that can stand to use as support.
Team
10 Not being able to meet deadlines/milestones
Not having a well developed project plan and keeping it updated
Product delay which may lost customers trust 2 2 4 Have daily or weekly updates on
assignments and if help is needed Team
11 Going over budget Not keeping track of budget or knowing what the budget is
Having to ask for more or falling short on supplies to develop the product.
1 1 1 Schedule to audit budget every 2 weeks. Team
12 All team members not being able to meet
Miscommunication or lack of communication between team members
Team members missing meetings or not being active in their roles 2 1 2
Communicate with team verbal and text/email when and where will meetings will take place.
Team
Benchmarking • Current Models:
• Maximum weight supported 200-375 lbs • Uses suction cups for stability • Uses a waterproof hand remote • Powered by a rechargeable battery • Minimum lift height range 2.5”-5” • Maximum lift height range 17”-21” • Product total weight 19-27.5 lbs • Around 7 lifts per battery charge • Duration of Stroke: Up-50s Down-35s
Benchmarking • Went to South Side Medical Supply that provided assisting
devices • The devices in the store were not powered, they were only
stationary • Thus, no readily available powered bathtub lift device to
consumers
Benchmarking
Specifications
Battery Power
Benchmarking
Many accessories
Portable
Benchmarking (Battery)
Benchmarking (Battery)
Benchmarking (Hydraulic)
Project Plan (WK 6-9)
Project Plan (WK 6-9)
Team Assessment • Team has become better at communicating, coordinating
meetings, and openly sharing ideas • Members are further finding their roles/strengths within the
team • Additionally, members are willing to step in to help other team
mates • Though team communication has improved, it has become
more difficult for all members to attend meetings due to increase in workload/outside obligations
• Team has become closer as a whole, but has many new challenges thanks to changes in the client situation
Questions?