A prosthetic foot, comprising a core, on which a proximal fastening device for fastening the prosthetic foot to a lower-leg tube or to a lower-leg shaft is arranged and which is surrounded by a foot casing. The foot casing forms a cavity, in which the core is inserted. A slot-shaped recess is formed in a front foot region of the foot casing, into which slot-shaped recess a tongue arranged on the core is inserted. The front foot region has a stiffness that deviates in comparison with the rest of the foot casing.

Implementations of a quasi-passive assistive device are disclosed. Such a device may comprise a spring mechanism that increases stiffness similar to a biological ankle. In one implementation, the spring mechanism may comprise a piston, valve, springs, or other elements to match a biological stiffness profile similar to that of a biological ankle. In one implementation, an apparatus for an artificial ankle is disclosed, comprising a piston coupled to a spring and the piston connected to a valve. The spring and the piston may store energy during dorsiflexion of the ankle and the spring and the piston release energy during plantarflexion of the ankle. The piston may store and release energy through the use of the valve.

A prosthetic foot structure includes a plate assembly having a toe portion and a heel portion. The plate assembly includes a first plate adjoining a second plate along a seam at which the first plate is bonded to the second plate. The seam has an end between the first and second plates, and the first plate is spaced from the second plate across a gap that reaches away from the end of the seam. An attachment structure attaches the first plate to second plate. The attachment structure has a composite composition including a resin material containing reinforcing fibers. The reinforcing fibers reach through the first plate, across the gap, and through the second plate.

A system with a foot shell, which has a forefoot inner contour and a heel inner contour, at least two prosthetic feet, each with a forefoot region and a heel region, and at least two forefoot inserts that can be positioned at the forefoot region of at least one prosthetic foot, and/or at least two heel inserts that can be positioned at the heel region of at least one prosthesis region, wherein each prosthetic foot has an outer contour of the forefoot with at least one forefoot insert positioned at its forefoot region, which is adapted to the forefoot inner contour of the foot shell, and/or that each prosthetic foot with at least one heel insert positioned at its heel region has a heel outer contour which is adapted to the heel inner contour of the foot shell.

A prosthetic ankle includes a pair of prosthetic members movably coupled together to allow movement of the pair of prosthetic members with respect to one another. A hydraulic actuator or damper including hydraulic fluid in a hydraulic chamber is coupled to one of the pair of prosthetic members. A hydraulic piston is movably disposed in the hydraulic chamber and coupled to another of the pair of prosthetic members. A hydraulic flow channel is fluidly coupled between opposite sides of the chamber to allow hydraulic fluid to move between the opposite sides of the chamber as the hydraulic piston moves therein. A voice coil valve is coupled to the hydraulic flow channel to vary resistance to flow of hydraulic fluid through the flow channel, and thus movement of the piston in the chamber, and thus influencing a rate of movement of the pair of prosthetic members with respect to one another.

A foot prosthesis that includes at least one spring element, an attachment member, and a heel member. The at least one spring element has a toe end portion, a heel end portion, an upper surface, and a lower surface. The attachment member is mounted to the upper surface and is configured to connect the foot prosthesis to a lower limb prosthesis component. A position of the attachment member is adjustable along a length of the at least one spring element. The heel member is mounted below the lower surface of the at least one spring element, and a position of the heel member is adjustable along the length of the at least one spring element.

A prosthetic foot has a frame, a forefoot keel, a heel keel, and an adjustable spring member. The frame couples to a prosthetic leg. The forefoot keel includes a first resilient substrate extending from the frame to the anterior end of the foot. The heel keel member includes a second resilient substrate extending from the frame to the posterior end. The first and second resilient substrates are load bearing substrates for a walking human. The adjustable spring member includes a third resilient substrate and a brake. The third resilient substrate has a first end directly or indirectly coupled to the brake, and a second end coupled to the forefoot keel proximate to the anterior end. The third resilient substrate extends through or around the first resilient member and the second resilient member. The brake provides resistance to the travel of the first end of the third resilient substrate in the superior direction.

A passive ankle-foot prosthesis to replicate a human foot. The passive ankle-foot prosthesis includes a foot part, an ankle frame, a yoke, and a spring. The ankle frame is attached fixedly to a second end of the foot part. The yoke is configured to be attached to a residual limb of a user. A first end of the yoke is pivotally attached to a first end of the ankle frame utilizing a pivot. The yoke is configured to rotate around a pivot axis. The pivot axis passes through the pivot. The spring is disposed between the ankle frame and the yoke. A first end of the spring is connected to a second end of the yoke. A second end of the spring is connected to a second end of the ankle frame. The spring is configured to apply an upward force to the second end of the ankle frame based on the yoke's rotational movements.

A limb support device includes a variable stiffness mechanism. The limb support device can be an orthotic or prosthetic device. The variable stiffness mechanism can include, for example, a rate-sensitive or speed-dependent material or a damping mechanism. The variable stiffness mechanism causes the limb support device to exhibit different properties when the user of the limb support device is walking at high or fast walking speeds compared to low or slow walking speeds. The limb support device can exhibit high damping and energy absorption, and therefore stability, at slow speeds, and high energy return at faster speeds.

Prosthetic feet that allow for heel height adjustment and/or provide metatarsal joint functionality to more closely mimic natural human feet are provided. A prosthetic foot can include an ankle module having a locking mechanism configured to lock the heel at a particular height. The prosthetic foot can also include a toe region that adapts to varying heel heights. The ankle module and/or locking mechanism can be adjusted, controlled, and/or locked via a hydraulic mechanism. The toe region can curve upward relative to a portion of the foot proximal of the toe region.