Three dimensional spacer fabric to increase the holding power of screws

Patent metadata

Field	Value
Publication number	US-10524837-B2
Application number	US-201715652693-A
Country	US
Kind code	B2
Filing date	Jul 18, 2017
Priority date	Jul 26, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A method of increasing a pullout force of a threaded fastener in osteoporotic bone includes drilling a hole in the bone. The spacer fabric is impregnated with a bone growth agent. A tube of the spacer fabric is sized to the hole in the bone. The tube of the spacer fabric is inserted in the hole of the bone. The spacer fabric is made from Nitinol wire. A threaded fastener is inserted into a central lumen of the tube of the spacer fabric to provide a rigid structure. The bone is grown into the spacer fabric.

First claim

What is claimed is:

1. A method of increasing a pullout force of a threaded fastener in osteoporotic bone, the method comprising:
drilling a hole in osteoporotic bone;
inserting a tube of spacer fabric in the hole of the bone, wherein the spacer fabric is made from knitted Nitinol wire and comprises a first fabric layer, a second fabric layer, and yarns interconnecting the first fabric layer and the second fabric layer, wherein a portion of the yarns are disposed at a perpendicular angle between interconnecting the first fabric layer and the second fabric layer, and the spacer fabric contacts the bone; and
inserting a threaded fastener into a central lumen of the tube of the spacer fabric, wherein the threaded fastener grips onto the spacer fabric.

2. The method as recited in claim 1 , wherein the spacer fabric is impregnated with a bone growth agent.

3. A porous structure comprising:
a knitted Nitinol wire structure forming a tube having a central lumen, wherein the structure comprises a top fabric layer, a bottom fabric layer, and yarns interconnecting the top fabric layer and the bottom fabric layer, wherein a portion of the yarns are disposed at a perpendicular angle between interconnecting the first fabric layer and the second fabric layer,
wherein pores of the spacer fabric comprise a slurry of calcium phosphate, methylcellulose, and glycerol.

4. The method as recited in claim 2 , wherein the bone growth agent is one of hydroxyapatite or calcium phosphate.

5. The method as recited in claim 1 , wherein pores of the spacer fabric comprise a slurry of calcium phosphate, methylcellulose, and glycerol.

6. The method as recited in claim 5 , wherein the slurry is frozen and lyophilized.

7. The porous structure as recited in claim 3 , wherein the slurry is frozen and lyophilized.

Assignees

• Arthrex Inc

Inventors

• Fonte Matthew
• Palmer Matthew
• Devaney Robert

Classifications

• A61L31/026

  Ceramic or ceramic-like structures, e.g. glasses · CPC title

• A61B17/686

  Plugs, i.e. elements forming interface between bone hole and implant or fastener, e.g. screw · CPC title

• A61B2017/00867

  shape memory effect · CPC title

• A61B17/68 Primary

  Internal fixation devices {, including fasteners and spinal fixators, even if a part thereof projects from the skin (bone staples A61B17/0642)} · CPC title

• A61L2300/112

  Phosphorus-containing compounds, e.g. phosphates, phosphonates · CPC title