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

1. A prosthetic full finger assembly, comprising:

a eccentric metacarpophalangeal (MCP) pivot configured for swivelable attachment to a hand of a user;

a distal coupler;

a proximal rocker rotatively coupled between the MCP pivot at a proximal end thereof and the distal coupler at a distal end thereof;

an adjustable ring tendon rotatively coupled to the MCP pivot at a proximal end thereof and the distal coupler at a distal end thereof;

a ring disposed upon the adjustable ring tendon, the ring configured to receive and retain a residual finger of the user, wherein:

the adjustable ring tendon together with the proximal rocker are configured to utilize articulation movements of the residual finger within the 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;

the MCP pivot is configured to utilize abduction and adduction movements of the residual finger within the ring to articulate the distal coupler within a plane parallel to an x-y plane and about an axis parallel to a z axis; and

further comprising a hand strap configured for attachment to a hand of the user, the MCP pivot rotatively coupled to the hand strap via an articulation joint.

2. The prosthetic full finger assembly of claim 1 , wherein:

the MCP pivot comprises a frame and an anchor plate;

the anchor plate is secured to the hand strap; and

the frame is rotatively coupled to the anchor plate via the articulation joint.

3. The prosthetic full finger assembly of claim 2 , wherein:

the hand strap comprises a plurality of anchor platforms;

when the hand strap is secured to the hand, each of the anchor platforms aligns with a corresponding MCP joint of the user; and

a select one of the anchor platforms forms the anchor plate.

4. The prosthetic full finger assembly of claim 1 , wherein the distal coupler comprises a distal interphalangeal (DIP) adjustment connector, the DIP adjustment connector configured for 360 degrees of rotation about an axis parallel to the y axis.

5. The prosthetic full finger assembly of claim 1 , wherein the adjustable ring tendon comprises a longitudinal adjustment channel having a proximal end and a distal end, and wherein the longitudinal adjustment channel is configured to retain the ring at a target location between the proximal and distal ends of the longitudinal adjustment channel.

6. The prosthetic full finger assembly of claim 1 , further comprising:

a proximal coupler; and

a distal rocker, wherein the proximal coupler and the distal rocker are pivotally suspended between a proximal coordinated pivot point anchored upon the adjustable ring tendon and a distal coordinated pivot point anchored upon the distal coupler.

7. The prosthetic full finger assembly of claim 6 , wherein:

the distal coordinated pivot point comprises a first hinged connection between the proximal coupler and the distal coupler and a second hinged connection between the distal rocker and the distal coupler; and

the proximal coordinated pivot point comprises a third hinged connection between the proximal coupler and the adjustable ring tendon and a fourth hinged connection between the distal rocker and the adjustable ring tendon.

8. The prosthetic full finger assembly of claim 7 , wherein:

the first hinged connection between the proximal coupler and the distal coupler and the third hinged connection between the proximal coupler and the adjustable ring tendon define a midline relative to the z axis;

the second hinged connection between the distal rocker and the distal coupler is located below the midline; and

the fourth hinged connection between the distal rocker and the adjustable ring tendon is located above the midline, such that a relative rotational motion between the adjustable ring tendon and the distal rocker causes a relative rotational motion between the proximal coupler and the distal coupler to emulate a finger's natural articulation within the plane parallel to the x-z plane.

9. A biomechanically driven prosthetic finger, comprising:

a hand strap configured to attach about a hand of a user;

a metacarpophalangeal (MCP) pivot attached to the hand strap, the MCP pivot having an articulation joint configured to rotate the MCP pivot relative to the hand strap within a plane parallel to an x-y plane and about an axis parallel to a z axis;

a distal coupler; and

an articulation assembly pivotally coupled between the MCP joint and the distal coupler, the articulation assembly configured to articulate relative to the hand strap 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 proximal rocker pivotally coupled between the distal coupler and the MCP joint;

an adjustable ring tendon pivotally coupled between the distal coupler and the MCP joint, the adjustable ring tendon having a longitudinal adjustment mechanism disposed therein, the longitudinal adjustment mechanism having a proximal end and a distal end; and

a ring configured to fit about a residual finger of the user, the ring disposed upon the adjustable ring tendon at a target location between the proximal and distal ends of the longitudinal adjustment mechanism, the target location based on a length of the residual finger;

wherein the MCP pivot comprises a frame and an anchor plate, the anchor plate secured to the hand strap and the frame rotatively coupled to the anchor plate via the articulation joint; and

wherein:

the hand strap comprises a plurality of anchor platforms;

when the hand strap is attached to the hand, each of the anchor platforms aligns with a corresponding MCP joint of the user; and

a select one of the anchor platforms forms the anchor plate.

10. The biomechanically driven prosthetic finger of claim 9 , wherein relative rotative motion between the frame and the anchor plate about the articulation joint of the MCP pivot causes the articulation assembly to adduct toward or abduct away from a midline of the hand.