A Lightweight Transradial Hand Prosthesis with a Variable Position Thumb and Thermoregulation Active transradial prostheses research has been rapidly progressing in large parts due to the advent of additive manufacturing. However, commercially available prostheses are far from being affordable. Even with advanced or affordable prostheses available in research and in the commercial sector, the device abandonment rate has been quite high. The design investigation provides a description of a lowcost 3Dprinted prosthetic hand aimed at addressing the top reasons for device abandonment, by devicing a new prosthesis handarm system that is light in weight, promotes active cooling of the residual limb and is costeffective. Surface EMG (sEMG) signals are acquired from the residual limb muscles and the processed signals are inferred into a simplified hand and wrist activity. The prosthesis discussed below consists of a 14DOF, single degree of actuation robotic hand, with a rotary thumb. This is interfaced with a rotary wrist, which is mounted on an actively cooled residual limb interface that house the required control electronics and the sEMG sensors

Lightweight 10DOF Robotic Hand With BuiltIn WireDriven Mechanism The purpose of EMG prosthetic hands is to compensate for the lost functions of hand amputees. To restore the ability to perform activities in daily life, prosthetic hands need to have as many a degrees of freedom (DOFs) as possible. Furthermore, this requirement must be realized while retaining grasping stability and keeping the hand light in weight and small in size. In this study, our aim is to develop a 10DOF hand that can form the seven finger postures that are required for daily life activities. To achieve this objective, we propose a wiredriven mechanism built over a finger skeleton and implemented it on a hand. We confirm that the developed hand can achieve all of the goal actions. In addition, our developed hand was evaluated using two indices, rate of controllability and rate of weight, as defined in this research.