The proposed prosthesis is mainly composed of the rolling conjugated joints with a bionic design and the carbon fiber energy-storage foot. We investigated the flexibility of the prosthetic ankle joint movement, and the ability of the prosthetic foot to absorb ground impact during the gait cycle.
The foot contacted the ground with the ankle in a relatively neutral orientation for all running speeds, with the ankle in slight dorsiflexion at the slower speed, …
Flex-Foot Modular II is characterized by extremely lightweight, durability, high energy storage and release feet. 100% carbon fibre provides amputees with smooth and continuous movement from heel to toe. All ages and impact levels will benefit from an
Results demonstrated higher peak moments about the ankle joint with added body mass (+26 Nm), likely resulting in additional energy storage in the AT. Work at the ankle joint increased ...
Purpose Three-dimensional printed ankle-foot orthoses (AFO) have been used in stroke patients recently, but there was little evidence of gait improvement. Here, we designed a novel customized AFO with energy storage, named Energy-Storage 3D Printed Ankle-Foot Orthosis (ESP-AFO), and investigated its effects on gait improvement …
Ankle-foot orthoses (AFO) were well-used for stroke patients. Our study developed a new 3D printed AFO with the function of Energy Storage. It would be expected Chien-Hsien Yeh, Yi-Chun Tsai, Fong-Chin Su, Li-Chieh Kuo, Kai Chang, Ping-Han Chuang; Mechanical problem in 3D printed ankle-foot orthoses with function of energy storage.
Five people with a uni-lateral transtibial amputation walked on an instrumented treadmill at 1.1 m/s for three conditions (level ground, +7.5, −7.5 ) while wearing a prosthetic foot with a novel linkage system and …
prosthetic foot selection during the provision of definitive lower-limb prostheses. Where possible, recommendations are drawn from Cochrane Review, meta-analysis, systematic and narrative literature reviews, and published evidence-based guidelines. Where this standard is unavailable, alternate academic literature has been used to support individual …
In recent years, the introduction of advanced materials and innovative designs has led to the creation of Energy Storing And Return (ESAR) prosthetic feet, which better replicate the natural ...
Introduction The ankle joint plays a critical role during gait, absorbing energy during collision with the ground, contributing to overall stability, and providing the majority of net positive work for the forward propulsion of the body (Winter, Reference Winter 1991; Farris and Sawicki, Reference Farris and Sawicki 2011; Zelik et al., Reference Zelik, …
1579 JRRD Volume 51, Number 10, 2014 Pages 1579–1590 Differentiation between solid-ankle cushioned heel and energy storage and return prosthetic foot based on step-to-step transition cost Daphne ...
Propulsion during push-off is the key to realizing human locomotion. Humans have evolved a way of walking with high energy utilization, but it can be further improved. Drawing inspiration from the muscle-tendon unit, a passive spring-actuated ankle-foot exoskeleton is designed to assist with human walking and to lengthen walking …
For these design specifications (see Table 1.) the elastic energy stored in the spring is returned rapidly during push-off (~50-60% stride cycle) and provides all of the ankle positive work for propulsion. For both panels, data are plotted for a single stride from heel-strike (0%) to heel-strike (100%) of the same leg.
A microprocessor-controlled artificial foot is developed that captures some of the energy that is normally dissipated by the leg and "recycles" it as positive ankle work and demonstrates that energy recycling can be used to reduce the increased metabolic energy expenditure accompanying ankle impairments. Background Humans normally …
Purpose Three-dimensional printed ankle-foot orthoses (AFO) have been used in stroke patients recently, but there was little evidence of gait improvement. Here, we designed a novel customized AFO with energy storage, named Energy-Storage 3D Printed Ankle-Foot Orthosis (ESP-AFO), and investigated its eects on gait improvement in stroke patients.
Finite element models were developed to analyze the von Mises stress, deformation and strain energy. Elastic nylon, a thermoplastic silky material for the joint structure was used with the following characteristics: density 1.13 g/cm3, tensile modulus of elasticity 2300 MPa, yield strength 65 MPa, Poisson''s coefficient ν = 0.35. In addition ...
Yeh et al. [88] developed an innovative energy-storage 3D-printed ankle-foot orthosis (ESP-AFO) and examined its impact on gait improvement in 12 stroke patients.
We observed a consistent reduction in work at the foot and ankle when the intrinsic foot muscles were unable to actively contribute to energy dissipation and generation. These data demonstrate that the energetic function of the foot can be …
Ankle fracture (AF) is the most common fracture in orthopaedic trauma surgery and accounts for approximately 9% of all fracture types, with an annual incidence of 107–184 cases/100,000 people ( Court-Brown and Caesar, 2006 ). The most common fracture types are single and double ankle fractures ( Shibuya et al., 2014; Elsoe et al., …
In this paper, we present the first direct evidence that the intrinsic foot muscles also contribute to elastic energy storage and return within the human foot. Isometric contraction of the flexor digitorum brevis …
The ankle exoskeleton is a small exoskeleton structure around the ankle joint, which has an elastic component parallel to the calf muscle to reduce its metabolic energy (Wiggin et al., 2011 ...
The human foot and ankle system is equipped with structures that can produce mechanical work through elastic (e.g., Achilles tendon, plantar fascia) or …
Joint kinematics As total work increased, the joint range of motion for all joints (hip, knee and ankle) significantly increased, regardless of paradigm (P < 0.001). Subtracting the peak JHP (Fig ...
Much of our current understanding of age-related declines in mobility has been aided by decades of investigations on the role of muscle–tendon units spanning major lower extremity joints (e.g., hip, knee and ankle) for powering locomotion. Yet, mechanical contributions from foot structures are often neglected. This is despite the emerging …
Biomechanical studies have demonstrated enhanced mechanical energy storage in early stance and a considerable increase in positive power during push-off …
The variable-stiffness prosthetic ankle–foot (VSPA) with Decoupled Energy Storage and Return cam-based transmission. A rotation of the ankle joint causes deflection of a …
Conventional, passive prosthetic feet include the Solid Ankle Cushion Heel (SACH) foot and Energy Storage and Return (ESAR) prosthetics. After its introduction in 1980, the SACH foot became the standard due …
The design of a new exoskeleton is presented based on four electric linear actuators for the flexion motion range of the ankle of a user. The exoskeleton system is designed to be easy to operate and fairly inexpensive so that it can be used as a tool for exercising and the rehabilitation of the ankle. A prototype of the ankle exoskeleton is …
The ankle joint, also known as the talocrural joint, is a synovial joint that connects the bones of the leg, the fibula and tibia, with the talus of the foot. It is a complex hinge joint composed of two articulations. …
The ankle joint is formed by three bones; the tibia and fibula of the leg, and the talus of the foot: The tibia and fibula are bound together by strong tibiofibular ligaments. Together, they form a bracket shaped socket, covered in hyaline cartilage. This socket is known as a mortise. The body of the talus fits snugly into the mortise formed by ...
Energy storage and return of the prosthetic ankles was calculated from the ankle power input and output assuming a rigid foot segment with a single stationary rotation axis, which is consistent with previous prosthetic foot studies [11], [31].
Ankle anatomy. The ankle joint, also known as the talocrural joint, allows dorsiflexion and plantar flexion of the foot. It is made up of three joints: upper ankle joint (tibiotarsal), talocalcaneonavicular, …
Yeh et al. [] developed an innovative energy-storage 3D-printed ankle–foot orthosis (ESP-AFO) and examined its impact on gait improvement in 12 stroke patients. The gait analysis was conducted using a motion-capture system, and the participants'' satisfaction and fatigue were also evaluated.
A Controlled Energy Storage and Return (CESR) prototype prosthetic foot (Collins & Kuo, 2010), which can capture and store some of the collision energy normally …
Abstract. The ankle joint is one of the important joints of the human body to maintain the ability to walk. Diseases such as stroke and ankle osteoarthritis could weaken the body''s ability to control joints, causing people''s gait to be out of balance. Ankle–foot orthoses can assist users with neuro/muscular or ankle injuries to restore ...
The human foot is known to aid propulsion by storing and returning elastic energy during steady-state locomotion. While its function during other tasks is less clear, recent evidence suggests the foot and its intrinsic muscles can also generate or dissipate energy based on the energetic requirements of the center of mass during non-steady …
They are mainly applied to limit the movement of the ankle joint, while PAFOs can store part of the energy generated by body movement in linear or spring elements, then release energy when needed to assist walking. The structure, utilizations, and control strategies of AFOs are shown in Figure 3.