the design of an in-vivo rotator cuff measuring tool project update kathleen bieryla, katie...

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DESCRIPTION

Overview- Proposed Solution The Arthromeasure is a one-handed tool for surgeons to use during arthroscopic surgery in order to measure the extent of rotator cuff tears Provides accuracy as specified by the user Allows for correct classification of size of tear, which aids in surgical treatment

TRANSCRIPT

The design of an in-vivo rotator cuff measuring tool

PROJECT UPDATE

Kathleen Bieryla, Katie Fronczak, Martha Loehr, Eric Rainis

University of PittsburghSenior Design - BioE1161

Overview- Problem

• Surgical methods dependent upon ratio of a/b

• Currently there is no tool available to measure these dimensions Humer

us

Scapula

a) Length of torn tendon edge

b) Size of avulsed humeral insertion

c) Retraction of tendon

Overview- Proposed Solution

• The Arthromeasure is a one-handed tool for surgeons to use during arthroscopic surgery in order to measure the extent of rotator cuff tears

• Provides accuracy as specified by the user

• Allows for correct classification of size of tear, which aids in surgical treatment

Description

Initial Design

•Shaft

•Length: 15 cm (13 cm exposed)

•OD: 4 mm

•ID: 0.51 mm (0.020 in)

•Handle

•18 cm x 4 cm x 4 cm

Current Design

Alterations:

• Dimensions

• Propulsion System

• Wire Ejection Location

• Measurement System

Gear Mechanism

Features & Benefits

• Convenient moving mechanism on the handle

• Provides desired accuracy• a: +/- 1 cm• b: +/- 5 mm

• Gives surgeon an easy way to determine the best method of repair

Competitive Analysis• Currently, no tool is available

• 3mm hook - surgery• String and digital caliper – cadaveric

research• Strengths

• More accurate• Easy to use

• Weaknesses• Inaccuracy comes from surgeon

Team/Resources• MSRC

• Patrick McMahon M.D.• Richard Debski Ph.D• Lab and equipment

• Swanson Center• Rapid prototyping process

• Bioengineering Department• Funding

• Limitations• Money • Size of handle

Schedule•February—Initial prototype

• Choose final wire material• Purchase gears and assemble•Testing – accuracy and repeatability

•March—Cadaveric testing•April—Final product and grant proposal

Team Responsibilites

Katie B • Determine materials for measuring device

• Testing of wire and shaft materials• Help with SolidWorks model

Katie F • Keep quality controlled documents up to date• Final design history file

• Write protocols for cadaveric testing of reliability/accuracy

Martha • Design handle of measuring device

• Complete SolidWorks design

• Structural testing in SolidWorks

Eric • Design gear system for measuring device• Scheduling and external relations

• Physical cadaveric testing

Road Blocks • Meeting with advisor• Redesign of gear system

• Changed based on surgeon’s input

• Lack of knowledge

Current Status and Milestones• Solidifying final design

• Gear system• Sample materials for shaft and wire

• Viewed surgery – ask us what it’s like to be med students!

• Updated responsibilities and working plan• First draft of SBIR phase I proposal

Acknowledgements

• Dr. Patrick McMahon

• Dr. Richard Debski

• MSRC

• Department of Bioengineering, University of Pittsburgh

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