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US 2026/0102259 A1Published application
Geared cam expandable interbody implant and method of implanting same
AssigneeWarsaw Orthopedic, Inc.
InventorsJonathan M. Dewey, William D. Armstrong
Life of this patent
Estimating the term…
Abstract
A geared cam expandable spinal implant. Rotational motion of a rotating portion is translated into linear motion of a yoke, which moves geared cams at the distal end of the implant to mate with, and walk along, teeth of corresponding racks. The walking of the gear cam teeth along the rack teeth creates a regular rate of implant expansion, reduces initial excessive expansion force applied to the implant, and provides fine adjustment of the expansion rate and force.
Claims20
An expandable spinal implant comprising:
- a proximal end and a distal end defining a mid-longitudinal axis therebetween;
- a first endplate including an inner surface including a first rack portion;
- a chassis portion mounted within the expandable spinal implant the chassis portion having a proximal end and a distal end, the proximal end having an opening defined therein, a first set of inner threads defined in the opening, and a second set of inner threads defined intermediate the proximal end and the distal end of the chassis portion;
- a moveable portion mounted relative to the chassis portion, the moveable portion having an outer surface;
- and threads defined on at least a portion of the outer surface, the threads being configured to movably engage with the second set of inner threads in the chassis portion;
- and
- a first tooth rotatably mounted relative to the chassis portion, the first tooth configured to movably engage with the first rack portion,
- wherein rotation of the moveable portion along the second set of inner threads causes rotation of the first tooth that pivots the first endplate to expand the expandable spinal implant.
5 more elements
An expandable spinal implant comprising:
- a proximal end and a distal end defining a mid-longitudinal axis therebetween;
- a first endplate including an inner surface including a first rack portion;
- a chassis portion mounted within the expandable spinal implant, the chassis portion having a proximal end and a distal end, the proximal end having an opening defined therein, a first set of inner threads defined in the opening, and a second set of inner threads defined intermediate the proximal end and the distal end of the chassis portion;
- a moveable portion mounted relative to the chassis portion, the moveable portion having an outer surface, and threads defined on at least a portion of the outer surface, the threads being configured to movably engage with the second set of inner threads in the chassis portion;
- and
- a first tooth rotatably mounted relative to the chassis portion, the first tooth configured to movably engage with the first rack portion;
- wherein rotation of the moveable portion along the second set of inner threads causes rotation of the first tooth, and
- wherein to expand the expandable spinal implant, the rotation of the first tooth and interaction with the first rack portion moves the first endplate in a first direction.
5 more elements
An expandable spinal implant comprising:
- a first endplate including an inner surface including a first rack portion;
- a chassis portion mounted within the expandable spinal implant, the chassis portion having a proximal end and a distal end, the proximal end having an opening defined therein, a first set of inner threads defined in the opening, and a second set of inner threads defined intermediate the proximal end and the distal end of the chassis portion;
- and
- a moveable portion mounted relative to the chassis portion, the moveable portion having an outer surface, and threads defined on at least a portion of the outer surface, the threads being configured to movably engage with the second set of inner threads in the chassis portion and a first tooth rotatably mounted relative to the chassis portion, the first tooth being configured to movably engage with the first rack portion,
- wherein rotation of the moveable portion along the second set of inner threads causes rotation of the first tooth to move the first endplate in a first direction.
2 more elements
Dependencies are inferred from the claim text.