Snap-lock for drill sleeve
A device for drilling a hole in bone and for inserting bone screws into the drilled hole is provided. The device comprises a trocar, drill sleeve and protection sleeve in a telescopically nested configuration. The drill sleeve and protection sleeve may have an axial locking feature that allows the two pieces to be handled together as a unit by preventing inadvertent separation. The axial locking feature may comprise an integral annular ridge provided on one sleeve that cooperates with an annular groove provided on the other sleeve. One sleeve may also have at least one slot allowing the locking feature to be disengaged prior to separation of the sleeves. The sleeves may be easily separated with one hand by the user by the application of an axial separation force between a pair of flanges provided with the sleeves, and by a radial compression force applied to at least a portion of the drill sleeve.
1. An orthopedic system, comprising:
a protection sleeve having proximal and distal ends, a longitudinal axis and first inner and outer surfaces, the protection sleeve further having a protrusion extending inward from the first inner surface into a first longitudinal bore extending therethrough; and
a drill sleeve having proximal and distal ends, a longitudinal axis, second inner and outer surfaces and a second longitudinal bore extending therethrough, the second outer surface configured to be received within at least a portion of the protection sleeve, the drill sleeve having a recess extending into the second outer surface, the protrusion and recess cooperating to releasably axially lock the protection sleeve with the drill sleeve, the sleeves being separable from each other by applying an axial separation force between the protection and drill sleeves and a radial compression force to at least a portion of the drill sleeve,
wherein the inner surface of at least one of the protection and drill sleeves is configured to receive a drill bit for drilling a hole in bone.
2. The system of claim 1 , further comprising:
a trocar configured for insertion through the second longitudinal bore.
3. The system of claim 1 , further comprising:
a first flange located on the proximal end of the drill sleeve and a first tapered tip on the distal end of the drill sleeve; and
a second flange located on the proximal end of the protection sleeve and a second tapered tip on the distal end of the protection sleeve.
4. The system of claim 3 , wherein the first longitudinal bore is configured to receive a driver and bone fastener therethrough to allow insertion of the fastener into bone in a direction along the longitudinal axis thereof.
5. The system of claim 4 , wherein at least one of the first and second tapered tips is configured to align with a fastener hole in a bone fixation element.
6. The system of claim 5 , wherein the bone fixation element is one of a bone plate and an intramedullary nail.
7. The system of claim 1 , wherein the protrusion comprises a plurality of discrete protruding elements.
8. The system of claim 1 , wherein the protrusion comprises at least one circumferential ridge.
9. The system of claim 8 , wherein the recess comprises at least one circumferential groove corresponding to the at least one circumferential ridge.
10. The system of claim 9 , wherein the protrusion comprises first and second tapered surfaces.
11. The system of claim 9 , wherein the drill sleeve comprises at least one longitudinal slot extending between the second inner and outer surfaces, the slot running from at least one end of the drill sleeve and having a length, the slot further configured to render at least a portion of the drill sleeve radially flexible.
12. The system of claim 11 , wherein the at least one slot divides a first end of the drill sleeve into first and second halves, wherein pressing the first and second halves toward each other disengages the ridge from the recess, thereby allowing the protection and drill sleeves to be axially locked with, or separated from, each other.
13. The system of claim 11 , wherein the drill sleeve has two longitudinal slots diametrically disposed with respect to each other about the circumference of the drill sleeve.
14. The system of claim 8 , wherein the protrusion comprises at least one tapered surface configured to facilitate radial compression of the drill sleeve when the drill sleeve is inserted into the first longitudinal bore.
15. The system of claim 2 , wherein the protection sleeve, drill sleeve and the trocar are color coded to provide a visual indication of the size of a bone screw that can be received through the first longitudinal bore.
16. The system of claim 1 , wherein the outer surface of the protection sleeve is configured to be received within the bore of an aiming arm of an intramedullary nail to align the protection sleeve with a targeted fastener hole in a portion of the intramedullary nail.