US 2022/0087725 A1 · BONE GROWTH DEVICE AND METHOD

Abstract

An intramedullary lengthening device includes a housing and a distraction shaft. The intramedullary lengthening device is placed within a cavity of two bone sections (either already separated or purposely separated for insertion of the device). The distraction shaft of the intramedullary lengthening device is attached to the one of the bone sections using, for example, one or more attachment screws. The housing of the intramedullary lengthening device is attached to the second bone section using, for instance, one or more attachment screws. Over the treatment period, the bone is continually distracted, creating a new separation into which osteogenesis can occur. In one embodiment, the intramedullary lengthening device includes an actuator and an extension rod, which can be attached to one other.

Claims20

Dependent claims

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 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.

5 more elements

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, and an axial groove disposed on an outer surface thereof, 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 ball disposed within the axial groove disposed on the distraction shaft;
a ball cage disposed over the distraction shaft and the ball, the ball cage being configured to trap the ball within the axial groove;
a splined housing disposed over the ball cage and the ball, the splined housing having an axial groove disposed along an inner diameter surface of the splined housing, wherein the ball cage and the ball are interposed between the distraction shaft and the splined housing,
wherein the ball is constrained by the ball cage, and is configured to be disposed at least partially within the axial groove disposed on the distraction shaft, and at least partially within the axial groove disposed on the splined housing, thereby rotationally locking the splined housing to the distraction shaft, while allowing axial displacement of the distraction shaft relative to the splined 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.

8 more elements

Dependencies are inferred from the claim text.

Bone growth device and method

Life of this patent

Bone growth device and method

Life of this patent

Abstract

Claims20