Dynamic inter-spinous process spacer

摘要

An interspinous process spacer for distraction of the vertebra including a body portion having an operative panel for increasing the height thereof and defining an internal void in which an expandable member is provided for actuating the operative panel. A self sealing percutaneous access port is provided to enlarge the expandable member and actuate the operative panel. The body portion is anchored by flanges secured to adjacent spinous process. The port allows for adding or removing fluid from the one or more chambers or envelopes of the expandable member in order to adjust the height of the body and thus the interspinous process spacing. Subsequent to initial implantation and expansion the volume of the expandable member may be increased or decreased in a non-surgical in-office procedure in which a needle is used to add or remove fluid from the expandable member via the port and tubular member.

主权项

1. A dynamic spacer for insertion between the superior and inferior spinous processes of adjacent vertebra, comprising:
a body portion having a first side member and a second side member and defining a void there between;
at least one anchor member extending from said body portion for engaging said superior spinous process or said inferior spinous process when said body portion is situated between said adjacent vertebra;at least one operative panel moveably engaged to said first side member and said second side member; andan expandable member having a port for receiving fluid at a first end and having a second end proximal to said operative panel, said expandable member enlargeable upon receipt of said fluid via said port; anda bridging member engaged between said first side member and said second side member; whereby enlargement of said expandable member causes said at least one operative panel to move relative to said first and second side members thereby increasing the height of said body portion and distracting said adjacent vertebra; and wherein said at least one operative panel further comprises a protrusion extending from a surface thereof into said void, said protrusions adapted to engage said bridging member and thereby limit rotation of said operative panel.