Now showing items 1-12 of 12

    • A COMPENSATING SHOULDER JOINT TO ASSIST THE SHORT TRANSHUMERAL AMPUTEE 

      Williams, T. Walley, III (2008)
      The typical problem patient has a transhumeral amputation 30 to 60 mm below the axilla. No matter how well the socket is made, the moment arm in the socket is too little to sustain the four foot-pound torque of a typical ...
    • ADAPTING THE BOSTON DIGITAL ARM TO ACCEPT FIVE INDEPENDENT INPUTS FROM TMR AMPUTEES 

      Williams, T. Walley, III (2008)
      In conventional myoelectric control, muscles are assigned to control functions differing from those controlled in the intact limb. In 1984 a bilateral amputee was fitted with four myoelectric inputs around the shoulder. ...
    • Casting To Make A Frame Socket For Use With FSR Pressure Pads 

      Williams, T. Walley, III (1997)
      A technique is described to cast for a frame socket to be used with Force Sensing Resistors (FSR's) The technique produces the largest number of control sites and ensures that at each site all forces on the FSRs are normal ...
    • Clinical Application Of Roll-On Sleeves For Myoelectrically Controlled Transradial And Transhumeral Prosthese 

      Daly, Wayne; Williams, T. Walley, III (1999)
      Three transhumeral and five transradial prostheses have been successfully fit to patients using electrodes installed in roll-on sleeves. New metal electrodes and wiring have been developed and tested along with techniques ...
    • ELECTRIC UNLOCK FOR LTI LOCKING SHOULDER JOINT 

      Williams, T. Walley, III (2008)
      At the 2002 MEC, LTI introduced the improved Collier Shoulder Joint which was still being shown at the 2005 MEC. In 2006, the Collier design was replaced by a completely new joint with greatly improved durability. The ...
    • Improved Compensation Of Gravitational Torque At The Shoulder 

      Williams, T. Walley, III (1997)
      A simple analysis of prosthetic shoulders reveals that they are mainly used to position the orientation of the elbow in relatively few fixed positions. For some tasks the elbow needs to be positioned forward of the shoulder ...
    • Low Level Response Of Bock And Steeper Electrodes 

      Wallace, Craig; Williams, T. Walley, III; Taneja, Nathan (1999)
      For many years myoelectric fittings have been limited by the need for signals of at least 2011V when using convenient in-socket myoelectrode-amplifiers. With the introduction of the Bloorview-MacMillan MyoMicro technology, ...
    • New Clinically-Useful Control Strategies Made Possible By The Varigrip II Multi-Device Controller 

      Wallace, Craig; Williams, T. Walley, III (1999)
      The VariGrip II Controller can operate up to three variable speed motors. For inputs it uses two, three, or four variable voltages and one on-off switch. This makes a large number of control strategies available, but not ...
    • SMALL, LIGHT-WEIGHT, BUILT-IN BATTERIES OFFER MORE ENERGY AND IMPROVED COSMESIS 

      Williams, T. Walley, III (2008)
      One might think that with over a hundred Li-Polymer cells on the market, one could find just the right cell for every application, but this is far from the case. Most cells are made in Asia by companies that only sell ...
    • Strategies For Controlling Several Powered Devices 

      Williams, T. Walley, III (1995)
      When it is not possible to control two devices independently, mode selection schemes are used to shift one good control source like two good myoelectric sites so that two or duet devices can be controlled. The Boston Elbow ...
    • The Z-Axis Shoulder Joint - A New Concept 

      Williams, T. Walley, III (1997)
      It is difficult for a shoulder amputee to do anything while sitting at a desk or table with the elbow tucked in against the side. For useful work the elbow needs to move forward 30-45 degrees and out 30-45 degrees to a position ...
    • Working With VASI Push Switches 

      Williams, T. Walley, III (1997)
      Two single acting VAST push switches or the VASI operate a hand, elbow, or other device in dual-action push-a-little, push-a-lot switch will two directions. These switches are very reliable, but pose a number of problems ...