Study: NCT03900845

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: Dynamic Air Exchange - Rising Edge Design (DAE-RED)
Description: The DAE-RED suspension system expels perspiration to the prosthesis exterior using a hybrid battery-powered pump and a body-weight activated pump. To use the DAE-RED, subjects will be fit with a modified patellar tendon-bearing socket that fits over a custom liner and sock. Up to four air intake ports are located proximally on the liner, approximately 25 mm superior to the socket brim. These ports incorporate a microvalve that allows air to flow into the liner-skin interstitial space while still maintaining a vacuum suspension. Distally, the pin lock has a 3-mm hole along its longitudinal axis that allows perspiration to be expelled into a distal reservoir. The prosthesis will also include: a standard aluminum pylon, pyramid adapters, and an Ossur Proflex XC prosthetic foot with Unity pump and foot cover.

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: Dynamic Air Exchange - Rising Edge Design (DAE-RED)
Description: The DAE-RED suspension system expels perspiration to the prosthesis exterior using a hybrid battery-powered pump and a body-weight activated pump. To use the DAE-RED, subjects will be fit with a modified patellar tendon-bearing socket that fits over a custom liner and sock. Up to four air intake ports are located proximally on the liner, approximately 25 mm superior to the socket brim. These ports incorporate a microvalve that allows air to flow into the liner-skin interstitial space while still maintaining a vacuum suspension. Distally, the pin lock has a 3-mm hole along its longitudinal axis that allows perspiration to be expelled into a distal reservoir. The prosthesis will also include: a standard aluminum pylon, pyramid adapters, and an Ossur Proflex XC prosthetic foot with Unity pump and foot cover.

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: Perforated elastomeric liner
Description: The unique element of this perforated elastomeric liner are small perforations (\~0.3 mm diameter), uniformly distributed on a 4 x 5 mm grid, but with no perforations on the distal umbrella, that allow perspiration to be exuded into the liner-socket interstitial space. To use the perforated elastomeric liner, subjects will be fit with a modified patellar tendon-bearing socket that fits over a sock and the perforated elastomeric liner with a pin lock. The sock, worn between the socket and the liner, is used to absorb perspiration that is transported through the perforations in the liner. When needed for residual limb volume control, additional socks will be donned and included in tare weighing. The prosthesis will also include: a standard aluminum pylon, pyramid adapters, and an Ossur Proflex XC prosthetic foot and cosmesis.

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: Perforated elastomeric liner
Description: The unique element of this perforated elastomeric liner are small perforations (\~0.3 mm diameter), uniformly distributed on a 4 x 5 mm grid, but with no perforations on the distal umbrella, that allow perspiration to be exuded into the liner-socket interstitial space. To use the perforated elastomeric liner, subjects will be fit with a modified patellar tendon-bearing socket that fits over a sock and the perforated elastomeric liner with a pin lock. The sock, worn between the socket and the liner, is used to absorb perspiration that is transported through the perforations in the liner. When needed for residual limb volume control, additional socks will be donned and included in tare weighing. The prosthesis will also include: a standard aluminum pylon, pyramid adapters, and an Ossur Proflex XC prosthetic foot and cosmesis.

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: As-prescribed prosthesis
Description: The individual's as-prescribed suspension system is the prosthesis prescription that the patient and their clinical care team believes is the best prosthesis for their needs.

Intervention type: DEVICE
Group type: EXPERIMENTAL
Intervention: As-prescribed prosthesis
Description: The individual's as-prescribed suspension system is the prosthesis prescription that the patient and their clinical care team believes is the best prosthesis for their needs.