Laminoplasty devices and methods
Laminoplasty plates are engageable to at least one portion of a divided lamina to maintain a desired spacing relative to the spinal canal. The laminoplasty plates include a spacer portion having a first end and a second end that spans a gap formed by at least one of a divided lamina portion. The laminoplasty plates can include a lamina engagement portion at one end for engagement with the divided lamina portion.
1. A laminoplasty plate comprising a non-threaded spacer portion extending between a first end defining a first lamina engagement portion and a second end defining a second lamina engagement portion, the first lamina engagement portion comprising a first lamina engagement flange extending transverse to the spacer portion and a second lamina engagement flange extending in a first direction from a tip of the first lamina engagement flange, the first and second lamina engagement flanges forming an angle of 120 degrees, the second lamina engagement portion comprising a first flange lamina engagement flange extending transverse to the spacer portion and a second lamina engagement flange extending in a second direction that is opposite the first direction from a tip of the first lamina engagement flange of the second lamina engagement portion, the tips being spaced apart from the spacer portion by body portions of the first lamina engagement flanges, a tapered end of the second lamina engagement flange of the first lamina engagement portion extending away from the first lamina engagement flange of the second lamina engagement portion, a tapered end of the second lamina engagement flange of the second lamina engagement portion extending away from the first lamina engagement flange of the first lamina engagement portion,
wherein the first end includes a first lateral flange and the second end includes a second lateral flange, the first lamina engagement flanges being positioned between the first and second lateral flanges.
2. A laminoplasty plate as recited in claim 1 , wherein the second lamina engagement flange of the first lamina engagement portion extends transverse to the first lamina engagement flange of the first lamina engagement portion and the second lamina engagement flange of the second lamina engagement portion extends transverse to the first lamina engagement flange of the second lamina engagement portion.
3. A laminoplasty plate as recited in claim 1 , wherein the first and second lateral flanges each include an inwardly facing bone engagement mechanism.
4. A laminoplasty plate as recited in claim 3 , wherein the second lamina engagement flange of the first lamina engagement portion faces the bone engagement mechanism on the first lateral flange and the second lamina engagement flange of the second lamina engagement portion faces the bone engagement mechanism on the second lateral flange.
5. A laminoplasty plate as recited in claim 1 , wherein:
the first lamina engagement flange of the first lamina engagement portion is configured to deflect relative to the first lamina engagement flange of the second lamina engagement portion;
the first lateral flange is configured to deflect relative to the first lamina engagement flange of the first lamina engagement portion; and
the second lateral flange is configured to deflect relative to the first lamina engagement flange of the second lamina engagement portion.
6. A laminoplasty plate as recited in claim 1 , wherein the second lamina engagement flange of the second lamina engagement portion extends at an angle of 120 degrees relative to the first lamina engagement flange of the second lamina engagement portion.