The design of an in-vivo rotator cuff measuring tool PROJECT PROPOSAL Kathleen Bieryla, Katie Fronczak, Martha Loehr, Eric Rainis University of Pittsburgh Senior Design - BioE1160 Arthrometric, Inc.

Background Shoulder is the most injured joint in the body Rotator cuff tears are the most common shoulder injury Preferred method is arthroscopic surgery

Overview- Problem Surgical methods dependent upon tear dimensions Currently there is no tool available to measure these dimensions Humeru s Scapula

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 repair techniques to be utilized

Project Goals The ultimate goal is to create a tool to meet surgeons’ needs High-level timing goals for 2004 February—Initial prototype March—Cadaveric testing April—Final product and grant proposal

Description Diameter = 6 mm Length = 25 cm

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

Design Alternatives Digital output Disposable Push-button locking mechanism Dual wire design Caliper design

Competitive Analysis Currently, no tool is available A hook of known distance 3mm is used to estimate tear Strengths More accurate Tool specific for the problem Easy to use

Technology Solidworks: Solid modeling and structural analysis Swanson Center: Rapid prototyping process Arthroscopic system

Team/Resources MSRC Patrick McMahon M.D. Richard Debski Ph.D Lab and equipment Swanson Center Rapid prototyping process Bioengineering Department Funding Limitations Availability of materials

Schedule

Team Responsibilities Scheduling & external relations Quality systems SolidWorks design Physical testing Structural testing Testing protocols Katie B. Katie F.Martha Eric

Current Status Met with surgeon Understood problem Initial SolidWorks model Initial design history file Established a working plan

Acknowledgements Dr. Patrick McMahon Dr. Richard Debski MSRC Department of Bioengineering, University of Pittsburgh