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US5800549: Method and apparatus for injecting an elastic spinal implant

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Filing Information

Inventor(s) Qi-Bin Bao · Paul A. Higham · Charanpreet S. Bagga · Hansen A. Yuan ·
Assignee(s) Howmedica Inc. ·
Attorney/Agent(s) Peter C. Richardson ·
Primary Examiner David Isabella ·
Application Number US8846791
Filing date 04/30/1997
Issue date 09/01/1998
Predicted expiration date 04/30/2017
U.S. Classifications 623/17  · 606/99  ·
International Classifications A61F 244  ·
Kind CodeA
International Classifications 62317;16;66;8 ·
11 Claims, No Drawings


Abstract

A method and apparatus for injecting an elastic spinal implant into a cavity in a spinal disc so as to treat disc degeneration are given. The method and apparatus can be used in a variety of surgical approaches with respect to the patient. An elastic spinal nucleus prosthesis is very quickly inserted into the cavity through a small opening in the disc so that permanent deformation of the prosthesis is avoided.

Independent Claims | See all claims (11)

  1. 1. An insertion device for inserting an elastic prosthetic spinal nucleus 12 into an intervertebral disc space, said device comprising:(a) a tapered cannula 14 having a straight zone 48 with a cross-sectional area which approximates the cross-sectional area of said prosthetic spinal nucleus 12 and said tapered cannula 14 having a tapered zone 34 which tapers from said straight zone 48 to a proximal opening 50, wherein the cross-sectional area of said straight zone 48 divided by the cross-sectional area of said proximal opening 50 is a ratio lying between about 3 and about 8; and(b) a force transmitting element 16 for acting on said elastic prosthetic nucleus 12 at its distal end 13 when said nucleus 12 is positioned within said straight zone 48 of said tapered cannula 14, said force transmitting element 16 causing said nucleus 12 first to move into said tapered zone 34 and then out of said proximal opening 50, the force transmitted by said force transmitting element 16 varying directly with the ratio between the cross-sectional area of said straight zone 48 and the cross-sectional area of said proximal opening 50 so that the speed at which said nucleus 12 passes through said proximal opening 50 is so fast as to avoid permanent deformation of said elastic prosthetic nucleus 12.
  2. 9. A method for implanting an elastic prosthetic spinal nucleus 12 into an intervertebral disc space comprises:(a) making a small opening in the annulus of said disc;(b) removing a portion of spinal disc tissue; and(c) inserting a nucleus implant 12 made of elastic material through a tapered cannula 14 with a taper which tapers from a straight zone 48 to a proximal opening 50, with the ratio of the cross-sectional area of straight zone 48 to the cross-sectional area of the proximal opening 50 lying within the range from about 3 to about 8, and at a fast speed so that permanent deformation of said elastic prosthetic nucleus 12 is avoided.

References Cited

U.S. Patent Documents

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Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
US5800549 Howmedica Inc. Qi-Bin Bao et al. Sep 1998
EP0875219 Stryker Technologies Corporation Qi-Bin Bao et al. Feb 2004
DE69821542 STRYKER TECHNOLOGIES CORP BAO QI-BIN et al. Mar 2004