Patent ID: 11944358
Assignee: NUVASIVE SPECIALIZED ORTHOPEDICS, INC
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A lengthening device configured for placement between a first bone section and a second bone section, the device comprising:
a distraction shaft having an internal cavity disposed therein, wherein the distraction shaft is configured for fixation to the first bone section;
a housing configured for fixation to the second bone section, wherein the distraction shaft is configured to be telescopically displaceable relative to, and disposed partially within the housing;
a lip seal flange attached to the housing;
a lip seal configured to allow a sliding seal between the distraction shaft and the housing, the lip seal including:
a base portion configured to seal against an inner diameter of the lip seal flange;
one or more protrusions disposed about an inner diameter of the lip seal and configured to slidingly seal against the distraction shaft; and
an inner surface configured to slidingly seal against an outer diameter of the distraction shaft,

a collar configured to allow sliding of the distraction shaft within the housing, and to prevent the distraction shaft from rotating within the housing; and
an actuator configured to increase at least one of a distraction force between the distraction shaft and the housing and a length of the lengthening device, the actuator including:
a permanent magnet being configured for rotation relative to the housing; and
a lead screw operatively coupled to the permanent magnet via a gear assembly.