Spine distraction implant

Abstract

A spine distraction implant alleviates pain associated with spinal stenosis and facet arthropathy by expanding the volume in the spine canal and / or neural foramen. The implant provides a spinal extension stop while allowing freedom of spinal flexion. An interspinous process implant with a selectably expandable spacer can be placed between adjacent spinous processes. a device implanted between the spinous processes of adjacent vertebrae of the spine can be used for relieving pain associated with the vertebrae and surrounding tissues and structures by maintaining and / or adding distraction between adjacent vertebrae. A tissue expander can be adapted to move from a first insertion position, for ease of implantation between spinous processes, to a second retention position that prevents displacement of the implant. An embodiment of a system can include an implant having a spacer with a thickness and a wing, wherein a first configuration of the wing has a first height substantially similar to the thickness and wherein the wing is adapted to be selectably arranged in a second configuration such that the wing has a second height greater than the first height. A periphery of the implant has a shape generally conformal with a shape of an inner surface of a cannula and a cross-sectional diameter smaller than an inner diameter of the cannula. The cannula is inserted such that a proximal end of the cannula is arranged between the adjacent spinous processes. The implant is then urged into position between the adjacent spinous processes by way of the cannula, and subsequently arranged in a second configuration to fix the implant in position.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] The present application is a continuation-in-part of U.S. patent application Ser. No. 11 / 092,862, filed on Mar. 29, 2005; is a divisional of U.S. patent application Ser. No. 09 / 842,819, filed on Apr. 26, 2001, now issued as U.S. Pat. No. 7,201,751; which is a continuation-in-part of U.S. patent application Ser. No. 09 / 579,039, filed on May 26, 2000, now U.S. Pat. No. 6,451,019; which is a continuation-in-part of U.S. patent application Ser. No. 09 / 473,173, filed on Dec. 28, 1999, now U.S. Pat. No. 6,235,030; which is a continuation of U.S. Ser. No. 09 / 179,570, filed on Oct. 27, 1998, now U.S. Pat. No. 6,048,342; which is a continuation-in-part of U.S. patent application Ser. No. 08 / 958,281, filed on Oct. 27, 1997, now U.S. Pat. No. 5,860,977; which is a continuation-in-part of U.S. patent application Ser. No. 08 / 778,093, filed on Jan. 2, 1997 now U.S. Pat. No. 5,836,948. [0002] The present application is also a continuation-in-part of ...

AI Technical Summary

Benefits of technology

[0018] In another aspect of the invention, the implant is positioned between the first spinous process and the second spinous process and includes a distraction wedge that can distract the first and second spinous processes as the implant is positioned between the spinous processes.

[0029] Other implants and methods within the spirit and scope of the invention can be used to increase the volume of the spinal canal thereby alleviating restrictions on vessels and nerves associated therewith, and pain.

Problems solved by technology

Spinal stenosis results in a reduction foraminal area (i.e., the available space for the passage of nerves and blood vessels) which compresses the cervical nerve roots and causes radicular pain.

Another symptom of spinal stenosis is myelopathy, which results in neck pain and muscle weakness.

Extension and ipsilateral rotation of the neck further reduces the foraminal area and contributes to pain, nerve root compression and neural injury.

In addition, there are a variety of other ailments that can cause back pain in patients of all ages.

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