P14006 Bath Tub Lift Phase II Review Amos Baptiste Jeremy Czeczulin Andrew Hughes Richard Prilenski
Introductions Name Amos Baptiste Jeremy Czeczulin Andrew Hughes Richard Prilenski Major/Role Industrial & Systems Engineer/Team Leader Mechanical Engineer Mechanical Engineer 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 10 th -70 th 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 Theresa Loce Elizabeth DeBartolo Art North R.I.T Sonaris Hoyer Other Bath Tub Manufacturers Wheel chair users/handicap Hospitals (RGH) Nursing Homes Suppliers/Vendors (Southside Medical Supply) Interest
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 S4 CN04/CN12/CN14 System S5 CN03/CN04/CN05/CN06/CN08/CN11/C N13/CN14/CN16/CN17 S6 CN02/CN07/CN08/CN09/CN14 System Time to get device in/out of tub Correctly dimensioned seating area minutes 0-2 1 in^2 < 17 x 15 17 x 15 Must fit within tub System Uses faucet to raise client psi 30-80 60 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 S18 CN19/CN04/CN08/CN11/CN12/CN14/C N15/CN16/CN17 Operates on wide range of temperatures Fahrenheit 70-110 60-130 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) S20 CN21/CN09 System Lightweight system design lbs 20-30 25 Dimensions restricted to tub size S21 CN22/CN01/CN04/CN08/CN13/CN19 System Device powered by battery V 12-15 13.2 Alternative to hydraulic
Engineering Matrix # S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 Engineering Requirement Rotation of chair Width of armrests Time to get device in/out of tub Correctly dimenioned seating area Uses faucet to raise client Chair secured to using suction cups Long lasting material Time to engage hydro lift Material use, fixture design Concentration of nickel Lifting capabilities Height of user Diameter of lever Dimensions of device/fixture Rising time Noise Operates on wide range of temperatures Reclining ablity Compact transport design Lightweight system design Device Powered by Battery 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 Unit 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 Assist user's legs to device Transfer/slide arms 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 Get off device Lower device Extensions lower Manually transfer from device Disengage switch
Morphological Analysis Solutions Sub function 1 2 3 4 5 6 1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane 2 Transfer Device Getting 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 Manually Personal 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
Base Design
Base Design Sub function Solutions 1 2 3 4 5 6 1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane 2 Transfer Device Getting 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 Manually Personal 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
Base Battery Design
Base Battery Design Sub function Solutions 1 2 3 4 5 6 1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane 2 Transfer Device Getting 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 Manually Personal 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
Fully Battery Powered
Fully Battery Powered Sub function Solutions 1 2 3 4 5 6 1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane 2 Transfer Device Getting 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 Personal 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
Crane Device
Crane Device Sub function Solutions 1 2 3 4 5 6 7 1 Raise Device Water Power Battery Power Inflation Power Remote Control Magnetic Repulsion Chair Crane 2 Transfer Device Getting 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 Chair Crane 3 Assist Legs Personal 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 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
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 DATUM S S + 7 Affordable - - - 8 Fits Time Constraints + - - 9 Safety - + - 10 Light Weight - - - 11 Portable - - - + 3 6 6-5 4 5
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 DATUM S S + 7 Affordable + + - 8 Fits Time Constraints + + - 9 Safety - - - 10 Light Weight + S + 11 Portable + S - + 4 2 4-6 4 5
Risk Assessment ID Risk Item Cause Effect Likelihood Severity Importance Actions to minimize Owner No adding arm rails. Combination of material, water User injury due to Minor to severe injury to the Implement a safety device and use high 1 and human skin not having 1 3 3 Team falling/slipping off device customer/user friction materials enough friction causing user to slip. 2 3 4 Moderate the water temperature Water power supply inconsistent Electric power supply inconsistent 5 Device weight capacity 6 Not being able to fulfill requirements of broad user base (height/weight differences) 7 Fixture dimensions 8 Safety of user s legs 9 10 Transfer from starting position to the device Not being able to meet deadlines/milestones 11 Going over budget 12 All team members not being able to meet Water temperature is not properly set Psi level jump due to drop in water pressure Charge from battery may not be sufficient to operate device when running low Device not able to lift well over the minimum requirement Not conducting an ergonomics study on the stature of the users percentile and their reach Measurement errors of the bath tub and the device. Not considering thickness of materials in specs. When fixture is lowering it does not allow enough room for legs Unsafe transition from starting position to the device Not having a well developed project plan and keeping it updated Not keeping track of budget or knowing what the budget is Miscommunication or lack of communication between team members User may sustain burns or experience cold temperatures User may experience discomfort while operating device due to rough motions User may experience longer operation times or may become trapped in tub Device fails under heavy loading, trapping and possibly injuring user 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 Device not able to fit in the tub. Customer not being able to use the device. Minor to sever injury to the customer/users legs 1 2 2 Test water before getting into the tub Team 1 1 1 2 3 6 1 3 3 2 2 4 2 3 6 1 3 3 Possible falling injury 1 3 3 Product delay which may lost customers trust Having to ask for more or falling short on supplies to develop the product. Team members missing meetings or not being active in their roles 2 2 4 1 1 1 2 1 2 Run a test to see if users water pressure is consistent Apply a warning system/visual indicator that the battery is low. Through testing device must lift >150 lbs Have multiple team members measure the dimension of the tub and for every step of the process, re-measure to verify meeting constraints Have multiple team members measure the dimension of the tub and for every step of the process, re-measure to verify meeting constraints Apply a foot rest at the base of the device so the user can place their feet before operating 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. Have daily or weekly updates on assignments and if help is needed Schedule to audit budget every 2 weeks. Communicate with team verbal and text/email when and where will meetings will take place. Team Team Team Team Team Team Team Team Team 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 Battery Power Specifications
Benchmarking Portable Many accessories
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?