Bidirectional biomechanical prosthetic full finger configured for abduction and adduction with MCP pivot and multiple-finger ring

A bidirectional biomechanical finger assembly for a user's residual finger, comprising:

• a metacarpophalangeal (MCP) pivot;
• a distal coupler;
• and
• an articulation assembly rotatively coupled between the MCP pivot and the distal coupler, the articulation assembly including a multiple-finger ring configured to receive and retain the residual finger and at least one adjacent finger, the multiple-finger ring selectively disposed upon the articulation assembly, wherein:
• the articulation assembly is configured to utilize vertical movements of at least one of the residual finger and the at least one adjacent finger within the multiple-finger ring to articulate the distal coupler within a plane parallel to an x-z plane and about one or more axes parallel to a y axis;
• and
• the MCP pivot is bisected by a longitudinal centerline of the distal coupler and configured to utilize lateral movements of at least one of the residual finger and the at least one adjacent finger within the multiple-finger ring to articulate the distal coupler within a plane parallel to an x-y plane and about an axis parallel to a z axis;
• wherein the articulation assembly further comprises:
• an adjustable ring tendon having a distal end, a proximal end, and a longitudinal adjustment mechanism disposed therebetween, the proximal end rotatively coupled with the MCP pivot, the multiple-finger ring selectively disposed upon the adjustable ring tendon at a target location along the longitudinal adjustment mechanism;
• a proximal coupler;
• and
• a distal rocker, wherein the proximal coupler and the distal rocker are rotatively suspended between a proximal coordinated pivot point anchored upon the adjustable ring tendon and a distal coordinated pivot point anchored upon the distal coupler.

A bidirectional biomechanically driven prosthetic finger, comprising:

• a distal coupler;
• a metacarpophalangeal (MCP) pivot for attachment to a hand of a user, the MCP pivot having an articulation joint bisected by a longitudinal centerline of the distal coupler, the articulation joint configured to rotate the MCP pivot relative to the hand within a plane parallel to an x-y plane and about an axis parallel to a z axis;
• and
• an articulation assembly rotatively coupled between the MCP pivot and the distal coupler, the articulation assembly configured to articulate relative to the hand within a plane parallel to an x-z plane and about one or more axes parallel to a y axis, the articulation assembly comprising a multiple-finger ring configured to anchor onto a residual finger and at least one adjacent finger of the user;
• the articulation assembly further comprising:
• a proximal coupler rotatively coupled with the distal coupler via a first hinged connection;
• an adjustable ring tendon having a proximal end and a distal end, the multiple-finger ring disposed upon the adjustable ring tendon and slidably adjustable between the proximal and the distal ends of the adjustable ring tendon;
• and
• a distal rocker extending between the distal coupler and the adjustable ring tendon, the distal rocker having a distal end and a proximal end, wherein:
• the adjustable ring tendon rotatively couples with the proximal coupler via a third hinged connection;
• the first and the third hinged connections define a midline relative to the z axis;
• the distal end of the distal rocker rotatively couples with the distal coupler via a second hinged connection located below the midline;
• and
• the proximal end of the distal rocker rotatively couples with the adjustable ring tendon via a fourth hinged connection located above the midline.

A bidirectional biomechanically driven prosthetic finger, comprising:

• a distal coupler;
• a metacarpophalangeal (MCP) pivot for attachment to a hand of a user, the MCP pivot having an articulation joint bisected by a longitudinal centerline of the distal coupler, the articulation joint configured to rotate the MCP pivot relative to the hand within a plane parallel to an x-y plane and about an axis parallel to a z axis;
• and
• an articulation assembly rotatively coupled between the MCP pivot and the distal coupler, the articulation assembly configured to articulate relative to the hand within a plane parallel to an x-z plane and about one or more axes parallel to a y axis, the articulation assembly comprising a multiple-finger ring configured to anchor onto a residual finger and at least one adjacent finger of the user;
• wherein the multiple-finger ring comprises at least two rings, and wherein the two rings abut one another.