Method for a flexible stabilization system for a vertebral column

• US 4,743,260 A
• Filed: 06/10/1985
• Issued: 05/10/1988
• Est. Priority Date: 06/10/1985
• Status: Expired due to Fees

• Current Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Charles V. Burton
• Inventors: Burton, Charles V.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/742,923
• Time in Patent Office: 1,065 Days
• Field of Search: 128/69, 128/92 B, 128/92 BB, 128/92 BA, 128/84 R, 128/92 YM, 128/92 YF, 128/92 YP, 623/17
• US Class Current: 128/898
• CPC Class Codes: A61B 17/7007 Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
• CPC Class Codes: A61B 17/701 Longitudinal elements with a non-circular, e.g. rectangular, cross-section A61B17/7005, A61B17/7007 take precedence
• CPC Class Codes: A61B 17/7031 made wholly or partly of flexible material
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/8028 Cushions, i.e. elements forming interface between bone plate and bone
• CPC Class Codes: A61B 17/8033 having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers

Abstract

A method for a flexible stabilization system for a vertebral column is disclosed. The device includes a strong, non-metallic stabilization element or elements (18) for providing flexibility. The stabilization elements (18) are secured to the vertebrae (11) and (12) wherein, when secured, the stabilization element or elements stabilize the vertical column while still allowing for flexibility. In a preferred embodiment the stabilization elements are anchored to the vertebrae by a bone screw (15) having an upper shank portion (16) and a lower threaded portion (17) having segmented area (17c).

Claims

1. A method of stabilizing a portion of a vertebral column without fusion, the vertebral column having a first and second vertebra, the first vertebrae being adjacent the second vertebra, each vertebra having a posterior vertebral element, said method comprising:

(a) making an incision to expose the first and second vertebrae;

(b) removing the posterior vertebral element of each of the vertebrae, leaving first and second pedicles of the first vertebra and first and second pedicles of the second vertebra;

(c) anchoring a strong, non-metallic stabilization means stiff enough to stabilize the vertebral column but flexible enough to permit at least limited normal movement of the vertebral column having a first and second end to the posterior vertebral elements of adjacent vertebrae, wherein when anchored said stabilization means stabilizes, without the use of fusion, the vertical column while still providing flexibility so that forces on the stabilization means are dissipated throughout thereby reducing force concentration.

2. The method of claim 1, further comprising anchoring a bone screw into at least one of the pedicles of the first and second vertebrae, the bone screw having a threaded bottom portion and an upper shank portion and cooperatively connecting said first end of said stabilization means to said one of the pedicles of the first vertebra and said second end of said stabilization means to said one of the pedicles of the second vertebra.

3. The method of claim 2, wherein the stabilization means comprises a first rod and a second rod and said method comprises anchoring the first and second rods in a generally parallel relationship.

4. The method of claim 1, wherein the stabilizing means is made of a porous material.

5. The method of claim 4, wherein said porous stabilizing means is produced by the replamineform process.