Anterior cervical plate assembly

Patent metadata

Field	Value
Publication number	US-11229460-B2
Application number	US-201715814490-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	Nov 16, 2017
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

A cervical plate assembly is disclosed. The cervical plate assembly includes a base plate including: (1) at least two bone screw seats, each bone screw seat including a borehole dimensioned to receive a bone screw, and (2) a first blocking seat positioned between the at least two bone screw seats. The cervical plate assembly includes a blocking mechanism retained within the first blocking seat of the base plate. The blocking mechanism is selectively positionable between a closed position in which the blocking mechanism obstructs at least one bone screw seat to retain a bone screw with the base plate, and an open position in which the bone screw seats are unobstructed.

First claim

What is claimed is:

1. A plate assembly comprising:
a base plate including:
at least two bone screw seats, each bone screw seat including a borehole dimensioned to receive a bone screw, and
a first blocking seat positioned between the at least two bone screw seats; and
a blocking mechanism retained within the first blocking seat of the base plate, the blocking mechanism being selectively positionable between a closed position in which the blocking mechanism obstructs at least one bone screw seat of the base plate to retain a bone screw with the base plate, and an open position in which the bone screw seats are unobstructed,
wherein the blocking mechanism includes a biasing element arranged between a first blocking element and a second blocking element, and
wherein the first blocking element is configured to obstruct a first bone screw seat of the at least two bone screw seats, and the second blocking element is configured to obstruct a second bone screw seat of the at least two bone screw seats, and the first blocking element and the second blocking element are independently positionable from each other, and
wherein the first blocking element and the second blocking element define a housing cavity which is dimensioned to house a portion of the biasing element.

2. The plate assembly of claim 1 , wherein each borehole defines a central axis (a) angled relative to a central lateral axis of the base plate at a first angle, and (b) angled relative to a central longitudinal axis at a second angle.

3. The plate assembly of claim 2 , wherein the first angle is at least 25 degrees.

4. The plate assembly of claim 2 , wherein the second angle is at least 6 degrees.

5. The plate assembly of claim 1 , wherein the place assembly includes at least four bone screw seats.

6. The plate assembly of claim 1 , wherein the blocking mechanism is retained within the first blocking seat via a tapered slot formed in the base plate.

7. An anterior cervical plate assembly comprising:
a base plate including:
four bone screw seats, each bone screw seat including a borehole dimensioned to receive a bone screw, each borehole defining a central axis that is (a) angled relative to a central lateral axis of the base plate at a first angle and (b) angled relative to a central longitudinal axis at a second angle, wherein the first angle is at least 25 degrees, and the second angle is at least 6 degrees; and
two retention slots, each retention slot being positioned between a pair of the four bone screw seats; and
two blocking mechanisms, each blocking mechanism including a biasing element arranged between a first blocking element and a second blocking element, wherein the first blocking element is configured to obstruct a first bone screw seat of the four bone screw seats, and the second blocking element is configured to obstruct a second bone screw seat of the four bone screw seats, wherein the first blocking element and the second blocking element are independently positionable from each other, and wherein the first blocking element and the second blocking element define a housing cavity which is dimensioned to house a portion of the biasing element;
each blocking mechanism is retained within a respective one of the two retention slots, the blocking mechanisms are selectively positionable between a closed position in which the blocking mechanism obstructs at least one bone screw seat to retain a bone screw with the base plate, and an open position in which the bone screw seats are unobstructed.

8. The anterior cervical plate assembly of claim 7 , wherein the two retention slots each define a first profile having tapered side walls, and the blocking elements of the blocking mechanisms each define a second profile that is complementary to the first profile.

9. The anterior cervical plate assembly of claim 7 , further comprising bone screws configured to be inserted within a respective one of the bone screw seats, wherein the bone screws each include a screw head defining a relief groove, and each relief groove is dimensioned to receive a portion of a respective one of the blocking mechanisms.

10. The anterior cervical plate assembly of claim 7 , wherein the base plate defines a through window, and the through window is positioned between the two retention slots.

11. The anterior cervical plate assembly of claim 7 , wherein the first blocking element and the second blocking element each define a housing cavity dimensioned to receive a portion of the biasing element.

12. A plate assembly comprising:
a base plate including:
four bone screw seats, each bone screw seat including a borehole dimensioned to receive a bone screw, each borehole defining a central axis that is (a) angled relative to a central lateral axis of the base plate at a first angle and (b) angled relative to a central longitudinal axis at a second angle; and
two retention slots, each retention slot being positioned between a pair of the four bone screw seats; and
two blocking mechanisms, each blocking mechanism is retained within a respective one of the two retentions slots, and each blocking mechanism includes a biasing element arranged between a first blocking element and a second blocking element such that the first blocking element and the second blocking element are independently positionable from each other, wherein the first blocking element and the second blocking element define a housing cavity which is dimensioned to house a portion of the biasing element,

wherein (a) when the biasing element is in an expanded state then the first blocking element obstructs a first bone screw seat of the four bone screw seats, and the second blocking element obstructs a second bone screw seat of the four bone screw seats, and (b) when the biasing element is in a compressed state then the first blocking element and the second blocking element are positioned away from the bone screw seats and the bone screw seats are unobstructed.

13. The plate assembly of claim 12 , wherein the biasing element is a coil spring.

14. The plate assembly of claim 12 , wherein each blocking mechanism is completely retained within a respective one of the two retention slots slot such that each blocking mechanism is positioned below an upper surface of the base plate.

15. The plate assembly of claim 12 , wherein the first angle is at least 25 degrees and the second angle is at least 6 degrees.

Assignees

• Globus Medical Inc

Inventors

• Wolfe Daniel
• Spangler Daniel
• Mclaughlin Colm
• Cianfrani Jason

Classifications

• A61B17/7059 Primary

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

• A61B17/8061

  specially adapted for particular bones (A61B17/70 and A61B17/74 take precedence) · CPC title

• A61B17/8042

  the additional component being a cover over the screw head · CPC title

• A61B17/8033

  having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers · CPC title

• A61B17/8605

  Heads, i.e. proximal ends projecting from bone · CPC title