Patent ID: 9642720
Date: 2017-05-09
CPC Classifications: A61B,A61F

Claim:
1. An expandable implant device for insertion between two vertebrae, the device comprising: one or more lift bodies; a center body retractably moveable relative to a length of the device, wherein the center body has a plurality of sloped ramps along opposing longitudinal extending sides and one or more lift bodies each have a plurality of complimentary sloped surfaces on sides adjacent to opposing sides of the center body wherein lengthwise movement of the center body of the device moves the one or more lift bodies inward or outward relative to the center body, causing an expansion or retraction of height of the device; an exterior retaining band encircling the sides of the one or more lift bodies, the retaining band having a leading end having an opening; a threaded fastener having a rotatable fastener head retained to a distal trailing end of the retaining band and a threaded shank attached to a threaded opening at an end of the center body, wherein rotation of the rotatable fastener moves the center body relative to the retaining band causing the one or more lift bodies to raise or lower, the threaded fastener having a center opening for passing a guide wire through the device; and a nose portion at the leading end of the retaining band, the nose portion having a tapered head with a shank filling the opening of the leading end of the retaining band wherein the nose portion has a central passageway extending along the shank through the tapered head configured to pass a guide wire extending through the center opening of the threaded fastener through the device during implantation of the device, and wherein the sloped ramps are inclined directionally outward toward a leading end of the retaining band and rotation of the fastener draws the center body toward the trailing end as the one or more lift bodies move apart increasing the height of the device wherein the one or more lift bodies include an upper lift body and a lower lift body and the sloped ramps of the center body are formed in the shape of a chevron, the chevrons having an apex at a midline of the center body, the apex directionally positioned closer to a trailing end and as the center body moves aft towards the trailing end, the complimentary surfaces of the lift bodies ride along the sloped ramps moving the lift bodies parallel to the midline increasing the height of the device wherein the tapered head of the nose portion is conical or bullet shaped, wherein the shank is fixed to the center body and upon movement of the center body, the nose portion moves with the center body wherein the nose portion is fully extended relative to the leading end of the retaining band when the one or more lift bodies are retracted to a low height contracted position and is retracted at least partially into the leading end opening when the one or more lift bodies are fully expanded to a maximum height of the device.