Bed Scale System Interface Project Readiness Package Rev 16 May 2010

PROJECT SUMMARY

This project stems from the Bed Scale System family under the Low Cost Health Care and Medical Technologies family. It is one of four projects that will be developed in phase 1. Three of the four projects are Bed Scale Modules (P#####, P#####, and P#####) that will communicate with the Bed Scale System Interface (P#####). The vision of the Low Cost Health Care and Medical Technologies family is to create a positive impact on health care technology in hospitals of Lima, Peru. This will be done by creating and delivering 5 usable products to the public hospital of Lima Peru by the end of 10 years. This project family is the start of this relationship with hospitals in Lima, and was chosen as the first project since it is low risk. It is important that a usable product come from this project to prove RIT’s capability while establishing a new relationship. The goal of this project is to develop a modular interface for the bed scales to interact with. The interface unit will supply power to the bed scale modules in the system and retrieve, interpret, and display the signals received from the modules as usable data.

ADMINISTRATIVE INFORMATION: Project Name: Bed Scale System Interface Faculty: TBD By Senior Design Staff Project Number: P##### Industry Guide: TBD By Senior Design Staff Project Track: Bed Scale Project Customer: Benjamin Castañeda Project Family: Low Cost Medical Devices Project Sponsor: TBD By Senior Design Staff Parent Roadmap: Bed Scale Roadmap Project Budget: TBD By Senior Design Staff Planning Term: Spring 2010 Start Term: Fall or Winter 2010 End Term: Winter 2010-2011 or Spring 2011

PROJECT CONTEXT:

The mission of this project is to develop a modular interface for the bed scales to interact with. The interface unit will supply power to the bed scale modules in the system and retrieve, interpret, and display the signals received from the modules as usable data. This project is the centerpiece of the bed scale system family. Without this project the bed scales will not be able to be used in an effective manner. This is an entirely new project family so this will be the initial design for this project. The team should feel free to further define or redefine any of the specifications based on new customer input.

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PROJECT HOUSE OF QUALITY:

Condensed HoQ:

Tare System + + -- -- + Size of Bed -- Connection to Existing Bed ++ Installation Time -- Scale Mechanism ++ + -- + + Resolution + Corrolation Material Selection - ++ -- + ++ Very Strong Weight Display + ++ + + Strong Maneuverable - - Weak Voltage Output -- -- ++ ------Very Weak Current Output - - ++ - - None Use of Available Power + + - Standard Plug Memory ++ + - ++ ++ Read Frequency - + + -- Basic Math + - + -- Prefered increase improve increase nominal nomial decrease nominal increase increase increase

Engineering Metrics

Tare Health Care Data Logging Measuring Power Supply Interface Calculator Module Provider Interface Module r e w o P

y e t l y t i y t c l b u a u i g a l n l p l p t u e p i t b l m s u u a h a u i e t P r q v

t O a O e D e

s d y A r v t e r t y

r M f F u n a g h o S

e e o a d c g d t i r e i n m n l r e a s r e a e a o s u e a a Customer Requirements Customer Weights t T W M V C U S M R B

CR 3 1 3 3 3 3 3 1 1 1 4 Easy to Use 3 3 5 Adding to Existing Beds 1 6 Remain Portable 9 3 3 3 8 Tare Function 3 9 3 9 Most 9 Low Cost 9 3 1 1 1 3 Moderate 10 Level of Accuracy 3 3 1 1 1 Least 11 Manufactured Locally 1 None 12 Track Weight 1 1 1 9 3 13 Modular 1 3 1 14 Disinfect 9 15 Weigh Patients 9 3 3 1 16 Various Environments 3 3 3 3 9 9 17 Patient Identification 9 3 Raw Score 91 40 36 9 9 54 66 46 3 30 Relative Weight 23.7% 10.4% 9.4% 2.3% 2.3% 14.1% 17.2% 12.0% 0.8% 7.8%

% % Engineering Units lb-oz/ kg-g Binary difference Volts Amps % used compatible Bytes Hz Bits Min Max Target The full House of Quality can be viewed at: https://edge.rit.edu/content/R10009/public/House%20of%20Quality%20and%20Function%20Tradeoffs

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CUSTOMER NEEDS ASSESSMENT:

Condensed VoC: Code Stakeholders Importance Description Measure of Effectiveness Medical Personnel, The system should be easy to use for the physician and CR4 3 Time to train user Administration should not require the aid of a technician. The product should be its own unit that can be added to Percentage of beds it is compatible CR5 Hospital Admin. 1 existing hospital beds and rooms. with The beds with the installed bed scale must remain Maneuverability of bed with scale CR6 All 9 portable and easy to access. installed The product needs a tare function in order to find the CR8 Patient, Medical Personnel 3 Is it present patient's net weight. CR9 All 9 The product must be low cost. Cost limit TBD by hospital Different levels of accuracy are needed for different CR10 Patient, Medical Personnel 3 Percent accuracy patients and different medical conditions. Percentage of parts manufactured The product must be manufactured locally with readily CR11 Administration 1 in Peru and materials produced in available materials. Peru CR12 Medical Personal 1 The patient's weight should be tracked. Accessible, useful information CR13 Medical Personal 1 The system controls need to be modular. Compatibility with different scales

CR14 All 9 The system needs to be regularly disinfected easily. Time required to disinfect The system needs to be able to accurately weigh the CR15 All 9 % Difference patient. The system needs to be able to operate within various CR16 Administration 3 % Compatibility environments. CR17 All 9 The system must record patient identity. Binary The full Voice of the Customer can be viewed at https://edge.rit.edu/content/R10009/public/Voice%20of%20the%20Customer

ENGINEERING SPECIFICATIONS:

Condensed VoE: Relative Derives from Engineering Marginal Ideal Validation Engineering Spec. Importance Description Measure of Performance Customer Needs Units value Value Method (1,3,9) Precision & Accuracy - The degrees of accuracy ES1 CR10, CR15 3 Tare System lbs-oz / kg-g and precision will need to be determined. ES2 CR2, CR6 3 Size of Bed Module Size - The footprint of the scale. m^2 Digital Output - The display in which the health ES8 CR4, CR10, CR13 1 Weight Display Binary care provider will read the data. Hindering Performance - Decrease in the mobility ES9 CR6, CR13, CR16 3 Maneuverability % difference** of the bed. ES10 CR16 3 Voltage Output Voltage Volts ES11 CR16 3 Current Output Current Amps % of available ES12 CR6, CR16 3 Use of Available Power Watts - Power usage power used Compatibility- How compatible is it to hospital % of outlets it ES13 CR6, CR9, CR13, CR16 3 Standard Plug outlets. can use Size - A record of a patient’s weight must be ES14 CR12 1 Memory Bytes logged within the system. Frequency - The time between when the data is ES2 CR15 1 Read Frequency Hz collected should be determined. ES16 CR8, CR9, CR10, CR13 1 Basic Math Accuracy - Calculating power. Bits The full Voice of the Engineer can be viewed at: https://edge.rit.edu/content/R10009/public/Voice%20of%20the%20Engineer

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PROJECT INTERFACES:

This project is the interface for several senior design projects. It will need to supply power to and take readings from the measurement devices. The measurement devices include one of the various bed scale units and a tare system. All of the bed scale units, regardless of their size and resolution, should all output the same type of signal and operate on the same power. This interface unit needs to plug into one of them at a time and read to the weight data.

Signal Communication/Interface: A standardized signal communication protocol must be defined and communicated to all of the bed scale teams within the first couple of weeks in senior design. (It is assumed that a digital signal should be used and is preferred.) With this standard signal protocol a standard connector should be used.

Power Interface: Input: 120V 60Hz. and 220V 50Hz. AC OR a Battery Output: Standard DC Voltage (Assuming) The power interface needs to minimize the current draw from the wall and be able to plug into standard wall outlets. A common connector should used to deliver power to the measurement devices.

Healthcare Provider Interface: An easy to use, intuitive, interface system to access the information needs to be developed.

There is the idea for a tare system in the works. It has the goal of keeping track of the weight added to and removed from the bed. This may be a standalone device (maybe being part of the overall interface system/cart design) or just software. However, there should be planned hardware inputs for it in the interface system. The tare system connectors may use keying or different connectors so that they cannot get mixed up.

ALL Bed Scales should use the SAME connectors. So the power connector is the power connector for all of the bed scales and the signal connector is the signal connector for all of the bed scales.

This team NEEDS to define the signal protocol, connectors, and planned power output of the power supply and communicate it to the other groups in this family within the first couple of weeks of senior design. They will need this information to continue with their projects.

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STAFFING REQUIREMENTS:

The work breakdown structure for this project is as follows: Position Title Position Description Electrical Engineer The job of this electrical engineer will be to deliver a constant power supply to the interface device and all devices attached to the unit. This job will require the skills of an EE focused on analog power systems.

Electrical Engineer The job of this electrical engineer will be to work with the CE to develop a means to interpret and display the data taken in from the scales. This job will require the skills of an EE focused on digital communication.

Computer Engineer The job of the computer engineer will be to work with one of the EE's to develop a means to interpret and display the data taken in from the scales. This job will require the skills of a CE who can design hardware to perform the above tasks.

Mechanical The job of the mechanical engineer will be to develop an enclosure that will satisfy all of the Engineer requirements that go along with use in a hospital. This job will require the skills of a ME who likes to do human factor related projects.

Computer Scientist The goal of the computer scientist / software engineer will be to develop a data logging system / Software that will output to the display of the interface. Engineer This job will require the skills of a CS/SE focused who can write an interface and data logging software.

PROJECT CONSTRAINTS:

Specific Constraints:

General Constraints: This final product should to be able to be manufactured locally with respect to the hospital that will use it. For this to occur considerations need to be made in material selection, and manufacturing capabilities of Lima, Peru. Also a small number of assembly parts is desirable. The largest constraint is cost. Public hospitals in Peru operate without a budget. They acquire medical tools by donations from other hospitals, or by monetary donations most commonly from the government. For this reason the up front cost must be as low as possible. To give an idea of the economic situation in Lima, the average person makes the equivalent of $800 US dollars per year. The weight measurements should be able to be displayed in English and metric units. This will make the product viable in almost every other potential market. Peru does not have a regulation organization such as the FDA in the United States. Hospitals use equipment well past its useful lifetime and maintenance may not be performed regularly. Each hospital has its own standards for equipment which need to be gathered from the project customer. Language is another constraint on this project. For delivering this project to Lima, Peru, the instructions on how to set up and use the product need to be in Spanish, the primary language of the location. If this product with be sent to other markets, the instructions need written in the primary language of the area. A list of general constraints can be found on the 10009 Constraints Page. https://edge.rit.edu/content/R10009/public/Constraints

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REQUIRED FACULTY / ENVIRONMENT / EQUIPMENT:

Describe resources necessary to support successful Development, Implementation and Utilization of the project. This would include specific faculty expertise for consulting, required laboratory space and equipment, outside services, customer facilities, etc. Indicate if required resources are available. Resource Available Category Source Description (mark with X) Dr. Beth Faculty Need guidance from someone with hospital and MSD experience. X DeBartolo

Environment Lab Space Space in which to store and test design. X

These will be developed by the students throught the quarter and needed Equipment Bed Scales for testing.

Materials TBD Determined by MSD Team.

Other

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