Artificial intervertebral disk and method for implanting the same

• US 5,716,416 A
• Filed: 09/10/1996
• Issued: 02/10/1998
• Est. Priority Date: 09/10/1996
• Status: Expired due to Term

• Current Assignee: Chih-I Lin
• Original Assignee: Chih-I Lin
• Inventors: Lin, Chih-I
• Primary Examiner(s): Isabella, David J.
• Application Number:
  US08/711,589
• Time in Patent Office: 518 Days
• Field of Search: 623/16, 623/17, 623/18, 623/66, 606/61
• US Class Current: 623/17.16
• CPC Class Codes: A61B 2090/08021 of the patient or his organs
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/441 made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30289 helically-coiled
• CPC Class Codes: A61F 2002/30291 spirally-coiled, i.e. having a 2D spiral cross-section
• CPC Class Codes: A61F 2002/30566 Helical springs
• CPC Class Codes: A61F 2002/30588 filled with solid particles
• CPC Class Codes: A61F 2002/4415 elements of the prosthesis being arranged in a chain like manner
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4635 using minimally invasive surgery
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: Y10S 606/907 : Composed of particular material or coated
• CPC Class Codes: Y10S 606/91 : Polymer

Abstract

A ring-shaped artificial intervertebral disk is made of an elastic material implantable into the human body. The artificial intervertebral can be transformed mechanically to have a straight rod shape before being implanted. Upon being implanted into the vertebrae, the artificial intervertebral disk regains its original ring shape.

Claims

1. An artificial intervertebral disk for surgical implantation in a defective natural intervertebral disk, the artificial intervertebral disk comprising an elastic material having an annular configuration at least substantially enclosing a central opening wherein the artificial intervertebral disk is deformed by an external force applied during implantation into a substantially straight configuration and wherein the artificial intervertebral disk returns to its annular configuration upon removal of the external force after implantation.

2. The artificial intervertebral disk as defined in claim 1, wherein said annular configuration has an encircling angle of at least 340 degrees.

3. The artificial intervertebral disk as defined in claim 1, wherein said annular configuration has an encircling angle of at least 360 degrees.

4. The artificial intervertebral disk as defined in claim 1, wherein said artificial intervertebral disk comprises a spring body implantable into a human body.

5. The artificial intervertebral disk as defined in claim 1, wherein said artificial intervertebral disk is made of a hydrogel material.

6. The artificial intervertebral disk as defined in claim 1, wherein said disk is made of stainless steel 316 LVM.

7. The artificial intervertebral disk as defined in claim 1, wherein said artificial intervertebral disk comprises an inner body covered by an outer layer.

8. The artificial intervertebral disk as defined in claim 7, wherein said inner body comprises stainless steel 310 LVM;

and wherein said outer layer comprises a hydrogel material.

9. The artificial intervertebral disk as defined in claim 7, wherein said inner body comprises a titanium-based alloy;

and wherein said outer layer comprises a hydrogel material.

10. The artificial intervertebral disk as defined in claim 7, wherein said inner body comprises a plurality of hydrogel particles;

and wherein said outer layer comprises a deformable container.

11. The artificial intervertebral disk as defined in claim 10, wherein said deformable container comprises a polyethylene knitted bag.

12. The artificial intervertebral disk as defined in claim 1 wherein said disk is made of a silicone material.

13. The artificial intervertebral disk as defined in claim 7 wherein said inner body comprises stainless steel 310 LVM, and wherein said outer layer comprises a silicone material.

14. The artificial intervertebral disk as defined in claim 7 wherein said inner body comprises a titanium-based alloy and wherein said outer layer comprises a silicone material.

15. A method for implanting an artificial intervertebral disk comprising the following steps:

making an incision in a body of a patient receiving treatment;

removing an injured or deformed intervertebral disk creating a space;

inserting a hollow tube into the body through the incision therein so that a first opening end of said hollow tube reaches the space created by removal of the injured or deformed intervertebral disk of said patient and a second opening end of said hollow tube is protruding outwardly from said body;

applying an external force to an artificial intervertebral disk normally having an annular configuration at least substantially enclosing a central opening such that the artificial intervertebral disk has a straight configuration;

inserting said straightened artificial intervertebral disk into said hollow tube from said second opening end and pushing said straightened artificial intervertebral disk so that said straigtened artificial intervertebral disk exists from said first opening end of said hollow tube into said space; and

withdrawing said hollow tube from said body thereby removing the external force from the artificial intervertebral disk and returning the artificial intervertebral disk to the annular configuration in said space.