Patent ID: 11918254
Assignee: NUVASIVE SPECIALIZED ORTHOPEDICS, INC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 19:
20. An implantable non-invasively adjustable distraction system comprising:
a distraction rod having a first end and a second end, the first end of the distraction rod being configured to couple to a subject's skeletal system at a first location, and the second end of the distraction rod comprising:
an elongate recess disposed therein,
a threaded portion disposed within the elongate recess, and
a tip portion having one or more protrusions disposed on an outer surface thereof, and longitudinally extending along an extent of the second end; and

an adjustable portion configured for placement relative to the subject's skeletal system at a second location remote from the first location, the adjustable portion comprising:
a housing having one or more grooves extending longitudinally along an inner surface thereof, each groove of the one or more grooves being configured to receive a corresponding protrusion of the tip portion therein, and each groove comprising a relief incorporated into a side or a corner thereof, the relief being configured to prevent a corner of the corresponding protrusion from contacting the inner surface of the housing;
a lead screw threadably received within the threaded portion; and
a magnetic assembly configured to at least partially contain a permanent magnet and to be non-invasively rotated by a moving magnetic field generated externally to the subject,

wherein the lead screw is hingedly coupled to the magnetic assembly via a locking pin passing transversely through both the lead screw and the lead screw,
wherein the locking pin, the lead screw and the magnetic assembly are contained within the housing, and
wherein rotation of the lead screw and the magnetic assembly causes axial movement of the distraction rod along a longitudinal axis of the adjustable portion within the housing.