P19014: Portable Upright Walker
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Problem Definition

Table of Contents

Team Vision for Problem Definition Phase

Project Summary

Current walker designs do not provide for the proper posture support required to manage age related issues such as parkinson’s, arthritis, and scoliosis. Additionally, many patients with these diseases experience a severe lack of independence and desire a walker which allows them to improve their overall quality of life and postural control. Our design seeks to provide safety, adjustability, maneuverability, and comfort while also seeking to release the design for distribution.

The goals of this project are to improve off of the current prototype by designing a low-cost, durable, add-on device for existing walkers to improve posture and gait over time, improve ergonomics for a better customer experience, and to produce a design which can be marketed to companies and easily manufactured. The design and product need to be compliant with intellectual property laws, be easy to operate, and be easy to store.

Link to 1-page project summary here

Use Cases

Use Case 1: End User Use Case Steps
  1. User recognizes need for movement
  2. User locks wheels
  3. User Stands up or is helped up
  4. User assumes control of walker
  5. User unlocks wheels
  6. User moves assisted by the walker
  7. User locks wheels
  8. User sits down
  9. User relinquishes control of the walker
Use Case 2: End User Use Case Steps
  1. User recognizes the need for a walker extension and an upright posture
  2. User acquires P19014 Upright walker attachment
  3. User reads and understand the directions with the attachment
  4. User attaches the Upright walker attachment
  5. User tests the connections of the walker attachment
  6. User decides the attachment is secure and safe to use
  7. User utilizes the walker paired with the Upright Walker attachment
High Level Use Case
High Level Use Case: Scenarios over time ---->

High Level Use Case: Scenarios over time ---->

Project Goals and Key Deliverables

Customer Requirements (Needs)

Stakeholders
  1. Mr. and Mrs. Edelman - Seeking a walker attachment that will allow better posture for people with age related disabilities while still providing mobility and comfort.
  2. Dan Phillips - Seeking a walker attachment that will allow better posture for people with age related disabilities while still providing mobility and comfort. Additionally, seeking to account for a wide spectrum of mechanical and mobility related issues.
  3. Arthur North - Seeking a functional prototype iterated from P18014's design.
  4. Physical Therapists - Seeking a treatment device for elderly patients.
  5. RIT MSD Department - Seeking a functional team and well designed device.
Customer Requirements
  1. Stable - The primary function of an assistive walking device is to provide support to a person in the case of a trip or fall. Any modifications to the device cannot interfere with this primary goal.
  2. Must interact with standard handicap facilities - People who use assistive walking devices desire a high level of independence and mobility. The devise must interact smoothly and cleanly with existing facilities.
  3. Able to support a full human weight - Should a person fall while using our design their full weight may be held by the device. This is critical for the stable customer requirement.
  4. Able to be lifted by one person - Should the customer desire mobility and transport the device must me light enough to lift and place in a car/truck/ect.
  5. Able to be adjusted - People have different heights and weights and require an adjustable frame to properly support their weight while providing correct posture.
  6. Compact - Device must be easy to ship and store to allow for ease of use and mobility.
  7. Cheap/Inexpensive - People seeking to purchase this device are likely going to fall in the <60 age bracket. Many of these customers are retired and receive little to no income.
  8. Able to quickly break wheels - As a safety concern client must never loose control of the device at all times.
Functional Requirements
Functional Requirements

Functional Requirements

link to the live document here

Inputs and Source

P19014 PRP

Customer Interviews

Regulations and Guidelines

Guide & Other Stakeholders

Outputs and Destination

Customer Requirements were used to generate engineering requirements table.

Engineering Requirements (Metrics & Specifications)

Purpose

  1. Create a contract between the engineer and the customer where indisputable satisfaction of the engineering requirements equates to customer satisfaction.
  2. Provide measurable benchmarks for each step of the design process.
Engineering Requirements
Engineering Requirements

Engineering Requirements

link to the live document here

Inputs and Source

Customer Requirements

Customer

Phase I Benchmarking
Benchmarking Devices:
Three devices used for benchmarking analysis

Three devices used for benchmarking analysis

Link to UPWalker- https://www.lifewalker.us/

Link to UStep II- https://www.ustep.com/standard-u-step-2/

Link to Inspired by Drive forearm platforms- https://www.bettymills.com/trekker-gait-trainer-forearm-platform-inspired-by-drive-tk-1035-s?utm_source=cpc-strat&utm_medium=cpc&utm_campaign=parts&utm_keyword=TK-1035-S&utm_content=Medical&gclid=CjwKCAjwlejcBRAdEiwAAbj6KRbOtO0v3abUVLcyo2Ea46jeVIyDmyqUyGAjpSHMjh5TWAlGtVeFmhoCMGQQAvD_BwE

Benchmarking table can be found here.
Benchmarking table with associated needs identified.

Benchmarking table with associated needs identified.

Regulations and Requirements

Selected Concept List

System Design

Guide & other Stakeholders

Outputs and Destination

  1. Function Decomposition
  2. Concept Generation & Development
  3. HoQ
  4. System & Detail Design
  5. Test Plans
  6. Poster & Final Report

Constraints

Risk Assessment Beginnings

Non-Exhaustive list of Risks:
Risk Assessment Draft:
Draft of Risk Assessment Table

Draft of Risk Assessment Table

Draft of risk assessment table here

House of Quality

Purpose

  1. Confirm that satisfaction of the Engineering Requirements implies that all of the Customer Requirements are met.
  2. Facilitate design trade off decisions.
House of Quality
House of Quality

House of Quality

link to the live document here
Potential Conflicts

Support 300lb of weight vs Colapsing to fit 9in x 14in x 22in

Tensile strength greater than 100Mpa vs Weighs less than 3lb

Frame of the Walker is at least 3 feet in each direction of the X and Y plane vs Folded Dimensions under 9 in x 14 in x 22 in

Engineering Requirements verses best bench marking results

Inputs and Source

Outputs and Destination

Our walker would be an affordable equivalent to the Parkinson's walker with laser-u step detailed above. We seek to provide a device that encourages proper posture and step guidance to people seeking movement aids. Our analysis of both customer and engineering requirements and risks will drive the design process for our device and assist in generating our risk management procedures.

Design Review Materials

Materials below:

Plans for next phase

MSD Week 3 to 7 Plan:
MSD Week 3 to 7 Plan

MSD Week 3 to 7 Plan

Individual 3 week plans:


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