Randall Alley, HiFi Interface Inventor, is asking prosthetists to look to science not art when creating interface designs. It is well documented that current socket designs are plagued by inherent issues causing instability, rotational issues, pistoning, falls, skin issues, excessive energy expenditure, and the inability for wearers to sit up straight. Randall will be highlighting the research and benefits of his HiFi Interface System technology, including improved comfort, function, stability, faster walking speeds, improved gait symmetry and more. No more “buckets.” Time to step up to a better design. Time to step up for better science. Time to step up for our patients.
Randall Alley was interviewed on the state of the art of prosthetics for Bionic Bodies on Voice of America. Alley’s High-Fidelity (HiFi) Interface was highlighted with humeral amputee Jason Morris and radial amputee Jonathan Cowley.
By: Jason T. Kahle, Tyler D. Klenow, William J. Sampson, M. Jason Highsmith
September 2016, Technology and Innovations, Vol. 18, pgs. 167-173, The Effect of Transfemoral Interface Design On Gait Speed and Risk of Falls
The purpose of this study was to compare the effect of TFA interface design on walking capacity and balance confidence A retrospective cohort design was utilized involving unilateral TFA patients who used ischial ramus containment (IRC) and High-Fidelity (HiFi) interfaces. Falls and diminished walking capacity are impairments common in persons with transfemoral amputation (TFA). Reducing falls and optimizing walking capacity through such means as achieving a more normal gait speed and community ambulation should be considered when formulating the prosthetic prescription. Because walking capacity and balance confidence are compromised with TFA, these outcomes should be considered when evaluating interfaces for transfemoral prosthetic users. The purpose of this study was to compare the effect of TFA interface design on walking capacity and balance confidence A retrospective cohort design was utilized involving unilateral TFA patients who used ischial ramus containment (IRC) and High-Fidelity (HiFi) interfaces (independent variables). Dependent variables included the Activity-specific Balance Scale (ABC) and the two-minute walk test (2MWT). Complete records were available for 13 patients (n = 13). The age range was 26 to 58 years. Three patients functioned at the K4 activity level, whereas all others functioned at the K3 level. Mean ABC scores were significantly different (p ≤ 0.05) at 77.2 (±16.8; 35.6 to 96.9) for IRC and 90.7 (±5.7;77.5 to 98.7) for HiFi. The mean distance walked on the 2MWT was 91.8 m (±22.0, 58.3 to 124.7) for IRC compared to 110.4 m (±28.7; 64.7 to 171.1) for the HiFi socket (p ≤ 0.05). Alternative transfemoral interface design, such as the HiFi socket, can improve walking capacity and balance confidence in higher-functioning TFA patients.
The High-Fidelity skeletal capture socket has shown promise in improving outcomes for persons with transfemoral amputation. This case report looks at a synergistic benefit when incorporating aquatic therapy with successful HiFi skeletal capture subischial transfemoral socket.
Jay Martin stated, “Randy has developed one of the most innovative sockets I’ve seen…the field will be adopting this technology. Biomechanics of what Randy has developed makes so much sense. Outcomes from the patients are phenomenal.”
Hear more feedback on HiFi from multiple prosthetists.
Jessica, an above knee amputee, struggled with finding a socket – until she found the HiFi. “The HiFi is amazing.” “Get out of my way when I’m on this socket.” “This is what you need.”
Alley conceived the threadless valve concept, and with the help of tranfemoral amputee Adam Soss and engineer Dustin Bouch, created the world’s first threadless valve family for preparatory and definitive suction socket applications.
“Many of today’s valve designs haven’t changed significantly in their approach to providing suction suspension since they were conceived decades ago,” said Alley. “I wanted to create a valve that was an improvement over existing valves and ultimately one that is easier for patients to use–hence the idea for a threadless design.”
The PushValve is a latching, threadless auto-expulsion valve designed primarily for above-knee suction socket applications, Alley explained. The lower-profile MagValve is a magnetic threadless auto-expulsion valve suitable for both upper- and lower-extremity suction sockets.
“The main advantage of the threadless valve design is that it does not require any twisting, but instead can quickly and effortlessly push in and pull out,” according to a company statement. “In addition, audible feedback lets a patient know they are properly seated and secure: they just click into place. No special tools are required for tightening/loosening, and there is no threat of pulling hairs. The valves are also ideal for bilateral amputees and individuals with hand involvement who wouldn’t be able to easily manage existing screw-in valves. Both valves are also perfect for active individuals who have a need for speed.”
To purchase the valves for your patients’ prosthetic sockets visit ottobocks website. https://shop.ottobock.us/Prosthetics/Lower-Limb-Prosthetics/Socket-Technologies-Liners/Valves/c/1606