Dual tether support of vertebra

Patent metadata

Field	Value
Publication number	US-2020323562-A1
Application number	US-202016845653-A
Country	US
Kind code	A1
Filing date	Apr 10, 2020
Priority date	Apr 12, 2019
Publication date	Oct 15, 2020
Grant date	—

Abstract

An apparatus includes a first flexible connector and a second flexible connector. The apparatus also includes a first bone anchor including a first tethering head configured to receive a first portion of the first flexible connector. The apparatus also includes a second bone anchor including a second tethering head configured to receive a second portion of the first flexible connector. The apparatus also includes a third bone anchor defining a first aperture configured to receive therethrough the first bone anchor. The third bone anchor also defines a first peripheral channel configured to receive a first portion of the second flexible connector. The apparatus also includes a fourth bone anchor defining a second aperture configured to receive therethrough the second bone anchor. The fourth bone anchor also defines a second peripheral channel configured to receive a second portion of the second flexible connector.

First claim

1 . A apparatus for coupling a first bone portion to a second bone portion, the apparatus comprising:
a first flexible connector; a second flexible connector; a first bone anchor including a first tethering head, said first tethering head being configured to receive a first portion of said first flexible connector; a second bone anchor including a second tethering head, said second tethering head being configured to receive a second portion of said first flexible connector; a third bone anchor defining a first aperture, said first aperture being configured to receive therethrough said first bone anchor, said third bone anchor defining a first peripheral channel, said first peripheral channel being configured to receive a first portion of said second flexible connector; and a fourth bone anchor defining a second aperture, said second aperture being configured to receive therethrough said second bone anchor, said fourth bone anchor defining a second peripheral channel, said second peripheral channel being configured to receive a second portion of said second flexible connector.

2 . The apparatus of claim 1 , wherein a first one of said first flexible connector and said second flexible is configured to be substantially inelastic and a second one of said first flexible connector and said second flexible connector is configured to be substantially elastic.

3 . The apparatus of claim 1 , wherein a first one of said first flexible connector and said second flexible connector has a first substantially uniform cross-sectional area, a second one of said first flexible connector and said second flexible connector has a second substantially uniform cross-sectional area, and said second substantially uniform cross sectional area is significantly less than said first substantially uniform cross-sectional area.

4 . The apparatus of claim 1 , wherein a first one of said first flexible connector and said second flexible connector is configured to have a first tensile elasticity, a second one of said first flexible connector and said second flexible connector is configured to have a second tensile elasticity, and said second tensile elasticity is significantly less than said first tensile elasticity.

5 . The apparatus of claim 1 , wherein a first one of said first flexible connector and said second flexible connector is configured to have a first ultimate tensile strength, a second one of said first flexible connector and said second flexible connector is configured to have a second ultimate tensile strength, and said second ultimate tensile strength is significantly less than said first ultimate tensile strength.

6 . The apparatus of claim 1 , wherein said second flexible connector includes a first member and a second member, said first member includes said first portion of said second flexible connector, said second member includes said second portion of said second flexible connector, and said first member is configured to be spliced to said second member.

7 . The apparatus of claim 4 , wherein said first bone anchor includes a threaded shank having a longitudinal axis, said first tethering head is configured to rotatively couple to said first threaded shank, and said first tethering head is configured to be rotated relative to said threaded shank about said longitudinal axis.

8 . The apparatus of claim 7 , wherein said threaded shank is configured to pivotally couple to said first tethering head, said first tethering head is configured to be pivoted relative to said first threaded shank about a first lateral axis, and said first lateral axis is generally orthogonal to said longitudinal axis.

9 . The apparatus of claim 8 , wherein said first tethering head is configured to be pivoted relative to said first threaded shank about a second lateral axis, and said second lateral axis is generally orthogonal to said longitudinal axis.

10 . (canceled)

11 . The apparatus of clam 7 , wherein said third bone anchor includes a collar portion having a rounded peripheral plane shape, said first peripheral channel includes a pair of generally parallel ridges, and said pair of generally parallel ridges extends at least partly around a circumference of said planform shape.

12 . The apparatus of claim 7 , wherein said first peripheral channel includes an eyelet.

13 . The apparatus of clam 9 , wherein said third bone anchor includes a collar portion having a rounded peripheral plane shape, said first peripheral channel includes a pair of generally parallel ridges, and said pair of generally parallel ridges extends at least partly around a circumference of said planform shape.

14 - 21 . (canceled)

22 . An apparatus for coupling a first tether and a second tether to a bone, the apparatus comprising:
a first member including a tethering head, said tethering head defining a pathway configured to receive at least a portion of said first tether, said first member including a means for inserting at least a portion of said first member into said bone; and a second member defining an aperture, said aperture being configured to receive therethrough at least a portion of said first member, said second member defining a peripheral channel, said peripheral channel being configured to receive at least a portion of said second tether, said second member including a means for inserting at least a portion of said second member into said bone.

23 . The apparatus of claim 22 , wherein said tethering head includes a means for locking said portion of said first tether in said pathway.

24 . The apparatus of claim 23 , wherein said means for locking said portion of said first tether in said first pathway includes a set screw threadedly coupled in said tethering head and movable in said tethering head to secure said portion of said first tether in said first pathway.

25 . The apparatus of claim 24 , wherein said means for inserting said portion of said first member into said bone includes a bone screw.

26 . The apparatus of claim 25 , wherein said means for inserting said portion of said second member into said bone includes a spike.

27 . The apparatus of claim 26 , wherein said second member includes a collar portion having a rounded peripheral plane shape, said aperture extends through said collar portion, said first peripheral channel includes a pair of generally parallel ridges, and said pair of generally parallel ridges extends at least partly around a circumference of said planform shape.

28 . The apparatus of claim 26 , wherein said peripheral channel includes an eyelet.

29 . An apparatus for coupling a first tether and a second tether to a bone, the apparatus comprising:
a tethering head having a pair of first and second opposing arms and a partitioning feature therebetween, said first arm and said partitioning feature defining a first pathway configured to receive at least a portion of said first tether, said second arm and said partitioning feature defining a second pathway configured to receive at least a portion of said second tether; and a means for coupling said tethering head to said bone.

30 . The apparatus of claim 29 , wherein said tethering head includes a means for locking said portion of said first tether in said first pathway and includes a means for locking said portion of said second tether in said second pathway.

31 . The apparatus of claim 30 , wherein said first and second opposing arms are threaded, and said means for locking said portion o

Assignees

• Orthopediatrics Corp

Inventors

• Hoernschemeyer Daniel Gerard
• Prygoski Matthew
• Detlefsen Rick
• Tozakoglou Evangelos

Classifications

• A61B17/7007 Primary

  Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads · CPC title

• A61B17/7022 Primary

  Tethers, i.e. longitudinal elements capable of transmitting tension only, e.g. straps, sutures or cables (A61B17/702 takes precedence) · CPC title

• A61B17/7032

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/7031

  made wholly or partly of flexible material · CPC title

• A61B17/809

  with bone-penetrating elements, e.g. blades or prongs (bone staples A61B17/0642; intramedullary nails with a plate at an end A61B17/7233) · CPC title