Provided is a wrist guard designed to press the radial and ulnar parts of a wrist toward the center of the wrist by means of a compression pad, so as to prevent side effects, such as hand numbness and swelling and effectively provide a fixing force of the wrist, thereby preventing the wrist from being excessively bent and alleviating wrist pain. The wrist guard allows a user to adjust the pressure load on the radial and ulnar parts of the wrist. It is possible to smoothly insert and assemble the pressing member into a coupling body, therefore improving operational feeling, the wrist guard may be stably used, and damage due to interference can be prevented. A stable pulling operation prevents wear and damage. As an excessive pressure load on the radial and ulnar regions is attenuated, the wrist guard is more convenient and comfortable.

A mechanical finger has a base. A proximal phalanx and a distal phalanx is provided with a first epicyclic joint between the base and proximal phalanx, and a second epicyclic joint between the proximal phalanx and the distal phalanx. A distal four-bar mechanism includes the proximal phalanx, the distal four-bar mechanism coupled to the distal phalanx. A nail is optionally provided and has a joint mechanism movably connecting the nail to the distal most one of the phalanges between a stowed position in which a grasping tip of the nail is concealed in the distal most one of the phalanges, and a deployed configuration in which the grasping tip projects out of the distal most one of the phalanges.

The present disclosure is directed to a compact wrist rotator and flexor mechanism for use with a prosthetic hand. The wrist rotator and flexor uses a set of motors to provide a driven mechanism having two degrees of freedom, a wrist rotation and a wrist flexion. The rotator uses a motor with an inverted shaft gearbox combined with a worm gear and a face gear transmission to generate continuous and non-backdrivable rotation. The rotator is integrated into a flexor that uses a lead screw acting as a linear actuator to provide strong non-backdrivable flexion and extension. Due to the arrangement of the drives, the resulting wrist rotator and flexor mechanism has a low and compact profile.

Features for prosthetic digits are described. The digits mimic natural fingers by having multiple articulating segments, for example three, that can rotate varying amounts. Actuation systems for the prosthetic digits may include a compact actuator that expands linearly to rotate the digit. Each digit may have its own actuator, which may be housed in the digit and/or the palm. A motor may rotate a leadscrew. The leadscrew may engage and move axially a housing or other member. Axial movement of the housing or member causes the proximal digit segment to pivot and thus the digit to articulate. In some embodiments, the leadscrew may rotate a wheel to actuate a tendon. An actuation tendon may cause a closing rotation of the digit segments, and a return tendon may cause an opening rotation.

Features for prosthetic digits and actuation systems including transmission features for a worm wheel rotation by a lead screw. A keyed member such as a central axle is spring-biased and transmits rotation from the worm wheel to the digit while allowing for manual rotation of the digit without damaging the worm wheel or other components. In some embodiments, the digit may include a link having flexibility to cause rotation of the digit segments while absorbing shock or otherwise high rotational loads. The digit may include a single-sided drive mechanism, where the opposite side provides support in case of high lateral loads. The digit may include a motor and gearbox in parallel and connected mechanically via a transfer gearbox. The digit may include a variable speed and variable torque gearbox.

A digit prosthesis assembly is described. Embodiments of the digit prosthesis assembly include, but are not limited to, an attachment assembly, a thumb assembly, one or more finger assemblies, a pinky finger assembly, a palm engagement assembly, and combinations thereof.

A prosthetic limb in amputation rehabilitation, having a forearm and a hand with four fingers and a thumb, with the wrist and the fingers & thumb thereof being fully independently controlled by nerve signals originating in the amputee's brain and not being controlled by the actions of nearby muscles in the amputee's upper arm or shoulder. Control of the prosthesis is achieved by a fully contained electronic unit in the forearm of the prosthesis that receives neural signals from the brain, converts the analog neural signals to digital signals that are fed into an artificial intelligence engine circuit that utilizes a library of algorithms to learn from the brain what the signals are that will produce a desired hand and finger movement, then convert its computed digital output to analog electrical signals that are fed to the prosthetic hand and finger to produce actual motion as instructed by the brain.

A prosthetic appendage for attachment to an outer extremity of an amputated limb that is composed of modular elements fabricated by three-dimensional printing. In one embodiment the prosthetic appendage is a leg. The prosthetic leg includes a foot portion and a plurality of modular and three-dimensionally printed limb elements. One of the plurality of limb elements is pivotally coupled to the foot portion and another of the limb elements is configured at one end to receive the outer extremity of the amputated leg. In another embodiment of the present invention the prosthetic appendage is a hand. The prosthetic hand includes a wrist element with one end configured to receive the outer extremity of an amputated hand, a base portion attached to the wrist element and a plurality of modular and three-dimensionally printed finger elements selectively coupled to adjacent finger elements or the base to form prosthetic fingers.

Systems and methods for postural control of a multi-function prosthesis are provided. Various embodiments provide for a postural controller that use EMG signals to drive a point in a posture space and outputs continuously varying joint angles for a powered prosthetic hand. The postural controller can include an EMG signal processing unit to receive signals from electrodes for processing (e.g., band pass filtering, rectification, root mean square averaging, dynamic tuning, etc.). The processed EMG signals can then be combined or converted to produce a point in the postural control domain. The PC domain map defines the posture that corresponds to each PC cursor coordinate. This map can have limitless possible postures and limitless possible positions of the postures. The Joint Angle Transform converts the PC cursor coordinate into the joint angle array which is sent to the prosthetic hand thereby creating more natural movements.

The disclosure provides apparatus and methods of use pertaining to a biomechanical finger brace assembly. In one embodiment, the assembly includes a coupling tip, a proximal ring configured to concentrically receive a user's finger, a distal ring configured to concentrically receive the finger, and a rocker formed in an H-shape. The distal ring and the rocker are pivotally suspended between a proximal coordinated pivot point anchored on the proximal ring and a distal coordinated pivot point anchored on the coupling tip, such that movements of the finger within the proximal ring articulate the distal ring together with the rocker to articulate the coupling tip. The coupling tip may include an open end or an enclosed recess to accept a minimally-amputated or non-amputated finger. Other embodiments are also disclosed.