Adjustable drill guide and methods of use thereof
Drill guide assemblies are adjustable for proper alignment of drill holes in the glenoid with the drill holes in the coracoid during a Latarjet procedure. The drill guide has an aimer arm extending from the body of the drill guide which has a fixed angle with respect to a drill sleeve inserted through the guide. The aimer arm can move up or down relative to the drill sleeve while maintaining the fixed angle relative to the drill sleeve by actuation of a translation member on the body.
1. A drill guide assembly, comprising:
an elongate body including a proximal end, a distal end and a longitudinal axis extending between the proximal and distal ends;
at least one channel extending along the longitudinal axis of the body from the proximal end to the distal end;
a sleeve slidably disposed within the at least one channel, a distal end of the sleeve configured to be secured to a first surface of a bone;
an aimer arm extending distally from the body, a distal end of the aimer arm configured to be secured to a second surface of the bone, the aimer arm extending at a fixed angle with respect to the sleeve; and
an alignment member extending from an upper surface of the body adjacent the distal end of the body, the alignment member defining a plurality of longitudinal slots;
wherein a vertical distance between the aimer arm and the sleeve is adjustable to a pre-selected distance by actuation of a rotatable wheel on the body such that the aimer arm maintains the fixed angle with respect to the sleeve;
wherein the aimer arm extends through opposing ones of the plurality of slots along the longitudinal axis, a projection of the aimer arm configured to serially engage the rotatable wheel such that the distance between the aimer arm and the sleeve is adjustable by rotation of the rotatable wheel by 90°; and
wherein the pre-selected distance is between 6 mm and 9 mm.
2. The assembly of claim 1 , further comprising a handle extending from a lower surface of the body configured to be held by a user.
3. The assembly of claim 1 , wherein the at least one channel is two channels extending on opposing sides of the aimer arm, and wherein a distance between the two channels is about 10 mm.
4. The assembly of claim 1 , wherein the sleeve comprises a bore extending from a proximal end to a distal end of the sleeve for the passage of a drill.
5. The assembly of claim 1 , further comprising a locking mechanism for locking the sleeve at a predetermined position within the at least one channel.
6. The assembly of claim 1 , wherein the proximal end of the sleeve comprises a depth stop, a diameter of the depth stop selected to be larger than a diameter of the channel for limiting distal movement of the sleeve within the channel.
7. The assembly of claim 1 , wherein the fixed angle is 10°.
8. The assembly of claim 1 , wherein the distance between the aimer arm and the sleeve is adjustable in a stepped or a non-stepped manner.
9. The assembly of claim 1 , wherein a pivot point of the rotatable wheel is offset from a center of the rotatable wheel in both a horizontal and a vertical direction.
10. The assembly of claim 1 , wherein a proximal end of the aimer arm comprises a locking knob for securing the aimer arm against the alignment member at the pre-selected distance.
11. The assembly of claim 1 , further comprising a compression spring disposed within the alignment member for biasing the projection of the aimer arm against the rotatable wheel.