Download - Group 16 Members: Emily Jaeger, Amy Rosenthal and Nicole Typaldos Presented by: Nicole Typaldos
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Group 16Members: Emily Jaeger, Amy Rosenthal and Nicole Typaldos Presented by: Nicole Typaldos29 October 2012
PROGRESS REPORT PRESENTATIONSENIOR DESIGN BME 401
A NEW MINIMALLY-INVASIVE BEDRIDDEN PATIENT WEIGHING SYSTEM
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BRIEF OVERVIEW OF DESIGN
Weigh bedridden patients within 0.23 kg (0.5 lb) and with minimal movement of patient.
A single user with no additional training to operate the device and obtain patient weight in less than 5 minutes.
Device will not interfere with normal patient care.
Adult and obese patient weighing 22.7 kg to 453.6 kg (50 lb to 1000 lb) should remain comfortable.
Automatic readout to display screen.
The device will cost a maximum of $10,000.
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DESIGN ALTERNATIVES
Location
breakdown of
design alternatives
Above Patient
Directly Under Patient
Beneath Bed
Below Bed Deck
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DESIGN ALTERNATIVES UNDER CONSIDERATION
1) Four Scales under bed
2) Two Slats under bed
3) Lift mattress
4) Single Fluid Filled Bladder
5) Legs with load cells
6) Capacitance load sensor
7) Above bed deck four load cells
8) Double lift device
9) Measurement of string tension
10) Spring partition mattress, displacement measurement
11) Current inducing magnet mattress
12) Compartmental fluid filled bladder
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ABOVE PATIENT
Double Lift Device Alternative to a single patient lift device, device has two structures
which connect above the patient’s bed to form a stable lifting apparatus.
Does involve displacement of the patient without repositioning.
Uses a typical sling lift, hydraulic lifts and attaching mechanism.
Wireless communication between the two sides.
Minimal tare capabilities.
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BENEATH BED
Four Scales under bed Improvement on currently available full bed weigh scales
Hospital bed is positioned on all four floor scales with patient remaining in bed
Compounding error unavoidable in this design
Use four load cells
Expanded force range to include bed weight, approximately 200 lb.
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DIRECTLYUNDER PATIENT
Capacitance load sensor Does allow patient to remain on device during entire stay.
Linear voltage output with respect to applied force.
Multiple measuring units necessary to acquire accurate readings.
Several variables to control design process to meet needs.
Unable to provide repeatability of readings in environment.
Embodiment Force
Support
Mobile Plate Fixed Plate with Dielectric
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ANALYSIS PERFORMED TO CHOSE DESIGN
Research of current components available that would be needed in the device manufacturing.
Benefits and Compromises that would be necessary for each device.
Review of current patient care practices and procedures.
Review of each design for potential patient and nurse safety issues within the hospital setting.
Pugh Chart with 25 variables for comparison of each design alternative.
Focus on patient safety and meeting design specifications.
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CHOSEN DESIGNCOMPARTMENTAL FLUID FILLED
BLADDER
Several compartments that measure the absolute pressure within the fluid filled bladder.
Single compartment did not offer repeatability necessary for informative weights.
Number and distribution of compartments will be determined in next stage of design.
Device is able to withstand necessary force range while maintaining linearity.
Directly below the patient and mattress
Patient is weighed undisturbed.
Medical staff will have access to weight during patient stay.
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GENERAL DESIGN
Single measurement unit Embodiment of Chosen DesignFluid Filled Bladder
Pressure Sensor
Hospital Bed
Compartment Representation
Top Surface
Base Surface
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NECESSARY EQUATIONS
Absolute Pressure
Weight of Patient
where a= base area of bladder
Compartment dimensions, solve to determine sensitivity to weight error, bladder fill conditions (h=height of bladder, A=total surface area, V=volume)
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9th 10th 11th 12th 13th 14th 15th
Background ResearchLiterature
PatentsConcept Generation
DesignSafe
9th 10th 11th 12th 13th 14th 15th
Design Webpage
Initial Processes
BrainstormingCombination Table
Project ChoiceDesign Requirements
Combination Table
Project Development
Course Assignments
Poster Presentation
Progress ReportProgress Presentation
Final ReportFinal Presentation
SCHEDULE FOR DESIGN COMPLETION
Final Due Date
Initial Draft
Timeline to work on project
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RESPONSIBILITIES Emily Jaeger
Presentation of Final Design
Device embodiment design
Amy Rosenthal
AutoCAD and website design
Materials for Design
Nicole Typaldos
DesignSafe and contacting manufacturers
Program GUI for device
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Group 16Members: Emily Jaeger, Amy Rosenthal and Nicole Typaldos Presented by: Nicole Typaldos29 October 2012
QUESTIONS?
A NEW MINIMALLY-INVASIVE BEDRIDDEN PATIENT WEIGHING SYSTEM