Systems and methods for surgical procedures using band clamp implants and tensioning instruments
Implants, systems, and methods for securing a flexible band, thereby providing a desired correction to the spine. The implant may secure the flexible band to patient anatomy without the use of pedicle screws or spinal rods. The implant may include a locking member configured to secure the band. The band may be looped around bony anatomy and tensioned to achieve correction and provide fixation as an alternative to pedicle screws and spinal rods during spinal deformity surgery.
1 . A band clamp implant assembly comprising:
an implant including an integrated screw head and band clamp, wherein the screw head defines a rod slot sized and dimensioned to accept a spinal rod and a bottom opening in the screw head is configured to receive a bone fastener, and the band clamp comprising a first portion comprising a first band slot configured to accept a first free end of a flexible band and a second portion comprising a second band slot configured to accept a second free end of the flexible band; and
the flexible band having the first free end coupled to a malleable leader configured to be fed around anatomy and into the first band slot and the second free end coupled to a buckle including a conical body and a flexure cut, wherein the buckle is receivable in the second band slot such that the flexure cut allows the buckle to flex and squeeze in the second band slot, and once fully positioned in the second band slot, the buckle springs back open to prevent disassembly from the implant
wherein a locking member includes a set screw and a saddle having a ring with one or more prongs extending upwardly into a corresponding recess within the set screw, and when the locking member is in a downward position, the saddle is configured to contact and secure the band in the band slot of the implant.
2 . The assembly of claim 1 , wherein the screw head retains a clamp and a screw head saddle configured to reversibly attach to a screw shank of the bone fastener.
3 . The assembly of claim 2 , wherein the clamp includes a collar with two clamp portions separated by a pair of slits, wherein the two clamp portions constrict and securely engage a head of the bone fastener.