Patent ID: 8795387
Filing Date: 2014-08-05
Classification: A61F

Abstract:
1. A prosthetic wrist for attaching between an arm prosthesis attachment socket and a terminal device, comprising: a proximal section having at a proximal end thereof an attachment post adapted for selective attachment with the prosthesis attachment socket; a central section pivotally attached to the proximal section with a first joint, the first joint including a first pivot axis; a distal section pivotally attached to the central section with a second joint, the second joint including a second pivot axis substantially orthogonal to and non-intersecting with the first pivot axis, the distal section further including at a distal end thereof a terminal device attachment mechanism; the first and second joints each including a proximal portion, a distal portion, a pivot, and a lock mechanism adapted for allowing angular selection between the proximal and distal portions and locking thereof; the first and second joints each further including a pair of fork extensions each having a mutually aligned aperture therethrough and defining a channel therebetween with a floor, a pivot arm having an aperture therethrough, and a pivot pin insertable through the apertures of the fork extensions and pivot arm; and the pivot pin further including an elastomeric ring fixed within a circumferential channel proximate one end thereof; whereby with the wrist attached to the arm prosthesis attachment socket at the attachment post, and with a terminal device attached to the terminal device attachment mechanism, the angle between the proximal section and the central section may be manually set along the first pivot axis, and the angle between the central section and the distal section may be manually set along the second pivot axis, and whereby the pivot arm is pivotable within the channel of the fork about the pivot pin, and whereby when the pivot pin is inserted into the aperture of one of the fork extensions, the elastomeric ring is compressed to retain the pivot pin within the aperture by friction.