Dynamic cervical plate

Patent metadata

Field	Value
Publication number	US-2016106484-A1
Application number	US-201514976721-A
Country	US
Kind code	A1
Filing date	Dec 21, 2015
Priority date	Sep 13, 2007
Publication date	Apr 21, 2016
Grant date	—

Abstract

A dynamic subsidence plate is described having a first plate member and a second plate member in sliding engagement that may infinitely subside between a first and second assembled position. The plate includes a lock assembly associated with the first and second plate members. The lock assembly includes a ramp portion, an interference portion, and a bearing member situated between the ramp portion and the interference portion. The lock assembly of the plate is configured to allow movement of the first member with respect to the second member in a first direction in an infinite number of positions between a first assembled position and a second assembled position. Further, the lock assembly alternatively prevents movement of the first member with respect to the second member in an opposite second direction between the first and second assembled positions.

First claim

1 . A dynamic subsidence device comprising:
a first plate member having first and second prongs defining a first portion of a central elongated aperture; a second plate member having first and second prongs defining a second portion of the central elongated aperture, the first and second plate members being translatable with respect to one another when the first and second prongs of the second plate member are operatively coupled to the first and second prongs of the first plate member; and a pin member having a head and a shaft, the shaft of the pin member being located within at least a portion of each of the first and second plate members when the first and second plate member are operatively coupled to one another, wherein a length of the central elongated aperture varies as the first and second plate members translate with respect to one another.

2 . The dynamic subsidence device of claim 1 , wherein the first plate member further includes at least one lateral elongated slot.

3 . The dynamic subsidence device of claim 2 , wherein the second plate member further includes at least two lateral apertures in one of the first or second prongs thereof.

4 . The dynamic subsidence device of claim 3 , wherein the first and second plate members are prevented from disengaging when the lateral elongated slot is situated between the at least two lateral apertures and the pin is placed through the at least two lateral apertures and the lateral elongated slot.

5 . The dynamic subsidence device of claim 1 , wherein the first plate member includes at least one opening for receiving a fastener therein for attaching the first plate member to a first vertebral body of the spine, and wherein the second plate member includes at least one opening for receiving a fastener therein for attaching the second plate member to a second vertebral body of the spine.

6 . The dynamic subsidence device of claim 1 , wherein the first and second prongs of the first plate member each having a male portion and a receiving portion.

7 . The dynamic subsidence device of claim 6 , wherein the first and second prongs of the second plate member each having a male portion and a receiving portion that correspond to the male and receiving portion of the first and second prongs of the first plate first member.

8 . The dynamic subsidence device of claim 7 , wherein a u-shaped wall defines the receiving portion of each of the first and second prongs of the first plate member.

9 . The dynamic subsidence device of claim 1 , wherein the central elongated aperture has proximal and distal ends, the proximal and distal ends each having a diameter greater than a width defined by a central portion of the central elongated aperture separated by the first and second prongs of each of the first and second plate members.

10 . A dynamic subsidence device comprising:
a first plate member having a body portion and first and second prongs extending inferiorly from the body portion, the first and second prongs defining a first portion of a central elongated aperture; a second plate member having a body portion and first and second prongs extending superiorly from the body portion, the first and second prongs defining a second portion of the central elongated aperture, the first and second plate members being translatable with respect to one another when the first and second prongs of the second plate member are operatively coupled to the first and second prongs of the first plate member; and a pin member having a head and a shaft, the shaft of the pin member being located within at least a portion of each of the first and second plate members when the first and second plate member are operatively coupled to one another, wherein a length of the central elongated aperture varies as the first and second plate members translate with respect to one another.

11 . The dynamic subsidence device of claim 10 , wherein the first plate member further includes at least one lateral elongated slot.

12 . The dynamic subsidence device of claim 11 , wherein the second plate member further includes at least two lateral apertures in one of the first or second prongs thereof.

13 . The dynamic subsidence device of claim 12 , wherein the first and second plate members are prevented from disengaging when the lateral elongated slot is situated between the at least two lateral apertures and the pin is placed through the at least two lateral apertures and the lateral elongated slot.

14 . The dynamic subsidence device of claim 10 , wherein the first plate member includes at least one opening for receiving a fastener therein for attaching the first plate member to a first vertebral body of the spine, and wherein the second plate member includes at least one opening for receiving a fastener therein for attaching the second plate member to a second vertebral body of the spine.

15 . The dynamic subsidence device of claim 10 , wherein the first and second prongs of the first plate member each having a male portion and a receiving portion.

16 . The dynamic subsidence device of claim 15 , wherein the first and second prongs of the second plate member each having a male portion and a receiving portion that correspond to the male and receiving portion of the first and second prongs of the first plate firstmember.

17 . The dynamic subsidence device of claim 16 , wherein a u-shaped wall defines the receiving portion of each of the first and second prongs of the first plate member.

18 . The dynamic subsidence device of claim 10 , wherein the central elongated aperture has proximal and distal ends, the proximal and distal ends each having a diameter greater than a width defined by a central portion of the central elongated aperture separated by the first and second prongs of each of the first and second plate members.

19 . A dynamic subsidence device comprising:
a first plate member having a body portion and first and second prongs extending inferiorly from the body portion, the body portion and the first and second prongs defining a first portion of a central elongated aperture; a second plate member having a body portion and first and second prongs extending superiorly from the body portion, the body portion and the first and second prongs defining a second portion of the central elongated aperture, the first and second plate members being translatable with respect to one another when the first and second prongs of the second plate member are operatively coupled to the first and second prongs of the first plate member; and a pin member having a head and a shaft, the shaft of the pin member being located within at least a portion of each of the first and second plate members when the first and second plate member are operatively coupled to one another, wherein a length of the central elongated aperture varies as the first and second plate members translate with respect to one another.

20 . The dynamic subsidence device of claim 19 , wherein the central elongated aperture has proximal and distal ends, the proximal end located in the body portion of the first plate member and the distal end located in the body portion of the second plate member, the proximal and distal ends each having a diameter greater than a width defined by a central portion of the central elongated aperture separated by the first and second prongs of each of the first and second plate members.

Assignees

• Stryker Europe Holdings I Llc

Inventors

• Bush Jr Charles L
• Bandeira Carla

Classifications

• A61B17/8023 Primary

  Variable length plates adjustable in both directions · CPC title

• A61B17/8009

  the plate having a ratchet · CPC title

• A61B17/8004

  with means for distracting or compressing the bone or bones · CPC title

• A61B17/7059

  Cortical plates (A61B17/7007, A61B17/7058 take precedence) · CPC title

• A61B17/88

  Osteosynthesis instruments;} Methods or means for implanting or extracting internal {or external} fixation devices {(A61B17/7074 takes precedence) · CPC title