Articulating rod holder
View Patent ↗A bi-directional mechanically deployed rod mechanism utilizes non-parallel cam surfaces with a unique engagement, entrapment, and release methodology. The instrument utilizes a unique spring loading pivot point and lockout mechanisms to prevent early release of the pivot point and bi-directional cam surfaces.
1. A bi-directional mechanically deployed rod mechanism, comprising:
a rod comprising a rod interface projecting from an end of the rod; and
a driver comprising:
a spring loaded pivot member extending from an end thereof, the spring loaded pivot member pivotally engaging a respective pivot point of the rod interface; and
a spring loaded cam member extending from an end thereof, the spring loaded cam member defining a distal pivot point and a reverse retention slot,
wherein the rod interface includes:
a cam member entrance;
a cam member exit defined in a non-parallel orientation with respect to the cam member entrance; and
a cam member retention arc disposed between the cam member entrance and the cam member exit, the cam member retention arc defining an inward-facing curved surface.
2. The mechanism of claim 1 , wherein the cam member entrance is perpendicular to the cam member exit.
3. The mechanism of claim 1 , wherein the rod interface further comprises a pair of female pivot depressions to engage a pair of corresponding male projections defined on the spring loaded pivot member.
4. The mechanism of claim 1 , wherein each of the a spring loaded pivot member and a spring loaded cam member move proximally and distally along a longitudinal axis of the driver between an extended position and a retracted position.
5. The mechanism of claim 4 , wherein the spring loaded pivot member is separately movable with respect to the spring loaded cam member.
6. The mechanism of claim 1 , wherein the rod interface further comprises a forward pivot point, wherein the cam member retention arc is spaced apart from the forward pivot point sufficient to allow the distal pivot point of the spring loaded cam member to span between the forward pivot point and the inward-facing curved surface of the reverse retention slot.
7. The mechanism of claim 1 , wherein the reverse retention slot of the spring loaded cam member is located such that the cam member retention arc is extendable through the reverse retention slot as the rod is pivoted with respect to the driver.
8. The mechanism of claim 1 , further comprising a lockout mechanism to prevent disengagement of the spring loaded pivot member and the spring loaded cam member from the rod interface.