Bone screw with fluid delivery structure

• US 20040267265A1
• Filed: 04/29/2004
• Published: 12/30/2004
• Est. Priority Date: 04/29/2003
• Status: Active Grant

• Current Assignee: Millennium Dental Technologies Incorporated
• Original Assignee: Millennium Dental Technologies Incorporated
• Inventors: Kyle, Richard F.
• Granted Patent: US 7,608,097 B2
• Time in Patent Office: Days
• US Class Current: 606/304
• CPC Class Codes: A61B 17/7098 wherein the implant is permeable or has openings, e.g. fenestrated screw hollow surgical screws A61B17/864
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated

Abstract

A device and method to mechanically strengthen bone matrix and deliver tissue reinforcement material to weakened areas in skeletal structures. A preferred embodiment is an orthopedic screw configured to receive and directionally disperse a therapeutic fluid through the screw'"'"'s channels and apertures.

Claims

1. A device for entering an area of a host'"'"'s bone matrix to mechanically strengthen the matrix and deliver tissue reinforcement material comprising:

a shaft with a first external threaded portion, said shaft having a distal end, a middle portion and a proximal end;

said shaft'"'"'s proximal end configured to receive a fluid supply of tissue reinforcement material within walls of said shaft forming a lumen extending therethrough;

walls forming at least one directional non-radial channel extending from said lumen to at least one aperture formed by shaft walls on an outer surface of said device to deliver tissue reinforcement material distally from the device.

2. The device of claim 1 further comprising a sleeve sized to fit inside said lumen to selectively guide delivery of tissue reinforcement material.

3. The device of claim 1 wherein the first threaded portion of the shaft extends from the proximal end to the distal end.

4. The device of claim 1 wherein the middle portion is not threaded.

5. The device of claim 1 wherein the distal portion has an open tip communicating with said lumen.

6. The device of claim 1 wherein at least one aperture is located within a threaded portion of said shaft.

7. The device of claim 6 wherein at least one aperture is located in a grooved section of a threaded portion.

8. The device of claim 7 wherein at least one aperture is located in a land of a threaded portion.

9. The device of claim 1 wherein at least one aperture is directed proximally at a proximal portion of said screw.

12. The device of claim 1 wherein at least on aperture is located at a medial portion of the screw and is shaped for radial dispersal of a bone reinforcing material therefrom.

10. The device of claim 10 wherein the diameter of the non-threaded portion is at least equal to the outside diameter of the threaded portion.

11. The device of claim 10 wherein the diameter of the non-threaded portion is less than the outside diameter of the threaded portion.

13. A method of fixating a bone screw comprising:

selecting an insertion site in a host patient;

selecting a bone matrix reinforcement screw;

inserting the screw into a host'"'"'s damaged bone matrix so as to cross trabeculae and adjacent zones;

connecting a fluid supply to the proximal end of said screw;

transporting said fluid into a lumen of the screw for distributing through directional channels extending between said lumen and an outer surface of the screw extending as directional apertures to disperse the material distally and proximally from distal and proximal apertures respectively.

14. The method of claim 13 wherein the fluid is selected from the group of recombinant bone growth factors, hydroxyapatite, and calcium phosphate.