Proprioception Testing Device

Lee C. Groeneweg, EGR

Thomas A. Farley, EGR

Steve Brodnicki, SPT

Ryane Eno, SPT

Mike Terrell, SPT

Definition of Proprioception

Joint position sense without visual input

– Measurements help inform physical therapist of patient’s ability to determine limb location in space

– Also helpful in determining whether therapy interventions are necessary

Project Overview

Device to isolate and measure internal and external rotation of shoulder joint

Internal Shoulder Rotation External Shoulder Rotation

Statement of Need

Device to isolate and measure internal and external rotation of shoulder joint

Must measure degrees similar to physical therapist’s goniometer

Test position must be self restraining (Locking)

Project Specifications

Isolation and measurement of shoulder internal and external rotation

Position of body - lying down on table No computer technology Easily used in a clinical setting Portable and light Measurement in degrees Inexpensive Test position must be self restraining (Locking)

Design Constraints

Patient positioned lying on back Shoulder blade must be immobilized Upper arm positioned 90° to body

– restrained restrained – allowing longitudinal motionallowing longitudinal motion– in a resting positionin a resting position

Elbow must be positioned 90° to upper arm

Prototype Stage

Discuss ideas 2-D CAD drawings Foam poster board Convey 3-D concept Receive approval

Production Stage

Approval of prototype design Updated 2-D CAD drawings Process plan for manufacturing Obtain material Manufacture parts Assemble parts for fit Test for proper function

Materials of Choice

Aluminum Plastic Standard Fasteners Camera Tripod Mini Laser Pointers Ergonomic Knob

Manufactured Parts

Base Plate Slider Brackets (2) Pivot bracket Upper Laser pen holder Lower laser Pen Holder Armature

Manufacturing Process Plan

Base Plate– Cut to rough size on band saw – Machined to finished size on vertical mill – Holes drilled using vertical mill – Slots machined using 4 flute 1/4" cutter on vertical mill – Surface finished with manual disk grinder to remove all surface

imperfections

Manufacturing Process Plan

Slider Brackets (2)– Cut to rough size on band saw – Machined to finished size on vertical mill – Holes drilled using vertical mill – Slots machined using 4 flute 1/4" cutter on vertical mill – Threads hand tapped

Manufacturing Process Plan

Pivot Bracket– Cut to rough size on band saw – Machined to finished size on vertical mill – Holes drilled using vertical mill – Counter bored holes machined using 4 flute 1/2" cutter on

vertical mill – Holes drilled using vertical mill

Manufacturing Process Plan

Upper Laser Pen Holder– Cut to size on band saw – Holes drilled using drill press

Lower Laser Pen Holder– Cut to size on band saw – Holes drilled using drill press

Manufacturing Process Plan

Armature– Machined to finished size on vertical mill – Holes drilled using vertical mill – Slots machined using 4 flute 1/4" cutter on vertical mill

Features & Benefits

Adjustable for multiple users Lightweight materials Fully Collapsible Portable while assembled Design is a baseline for future devices

Demonstration of Proprioception

Blind fold individual Place the limb into a test position Hold in test position for a few seconds Record angle of test position Return to starting position Patient places limb into the testing position Record angle of repeated attempt

Q and A Session

Lee C. Groeneweg, EGR

Thomas A. Farley, EGR

Steve Brodnicki, SPT

Ryane Eno, SPT

Mike Terrell, SPT

For addt’'l project info:

http://www.eod.gvsu.edu/~groenelc/MnfgProcess/EGR367.html