Harnessing forHarnessing forBody Powered ProsthesesBody Powered Prostheses

Ryan Spill, CPAdvanced Arm DynamicsSeptember 30, 2010

Figure 8 harness

• Suspension

• Control

Axilla loop

Inverted Y suspension

Inverted “Y” Strap for Suspension

Control Strap

Figure 9 Harness

• Provides control of TD only

• Alternate suspensory technique

Self-Suspending Socket Design with Figure 9 Harness

Custom Harness Designs

• Patient prefers suction

socket• Figure 9

harness for TD control• Distal

attachment to frame

Modified Control Cable

• Patient lives substantial

distance from office

• Heavy duty user

Alternate Control Cable

Alternate Anchor instead of Axilla Loop

Modified Triceps Cuff

Medial Cross Bar Assembly

BilateralFigure 8

Figure 8 harness

• Efficient• Suspension & Control

Suspension strap

Elbow Lock/Unlock

Elbow/TD control

Figure 8 Harness

Lock/Unlock Lock/Unlock ControlControl

Figure 8 Harness for Triple Figure 8 Harness for Triple ControlControl

Double Ring

Control Cable mounted Laterally

locklock

Control Strap Mounted Medially

Transhumeral Chest StrapTranshumeral Chest Strap

• Left Transhumeral amputee secondary to

trauma

• Contralateral hand weakness

TranshumeralTranshumeralChest StrapChest Strap

HarnessAttachmentLock/Unlock Cable

Easier for donning than

Figure 8

Control Strap

Modified Chest Strap

• Narrow Straps

• Medial lock/unlock attachment

allows locking by abduction

• Elastic suspensory

straps

• Control strap travels through

keeper attached to

elastic

Chest strap for Elbow Disarticulation

Modified Harness• Left transhumeral

amputee• Secondary to burns• Compromised hand

strength

Initial Chest Strap

Elastic Chest Strap Attached to Axilla Loop

Combination of Figure 8 and Chest Strap Designs

Socket Modification to Assist Harness

• Silicone Locking Liner• Proximal and Distal

Suspension Strap

Thank You!