Subject contacting plate

Patent metadata

Field	Value
Publication number	US-10813774-B2
Application number	US-201514639548-A
Country	US
Kind code	B2
Filing date	Mar 5, 2015
Priority date	Mar 7, 2014
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

An alignment plate can be designed and formed based upon a known geometry of a subject, such as a human patient. The alignment plate can include various members, such as a plurality of fingers or legs, to contact the selected points of the anatomy. Based upon contact of the fingers at the selected points of the anatomy, the alignment plate can be aligned at a preselected or predetermined alignment with a portion of the anatomy, such as an acetabulum.

First claim

What is claimed is:

1. A system for placing an acetabular cup, comprising:
a first member extending from a first end to a second end, the second end configured to fixedly engage an acetabular cup;
a sleeve member having a length shorter than the first member and comprising a throughbore extending through the sleeve member configured to slidably receive the first member, and an alignment plate engaging portion at a distal end of the sleeve member to hold an alignment plate relative to the sleeve member during movement of the first member; and
the alignment plate including a throughbore through which the first member is configured to extend and at least one finger extending from a central region to at least one engaging surface, the at least one finger configured to extend outside of an outer circumference of the acetabular cup during placement, the at least one engaging surface configured to engage a portion of a subject to align the alignment plate and the first member relative to the subject in a predetermined orientation;
wherein the first member is configured to move relative to the alignment plate;
wherein the system is configured for placement of the acetabular cup.

2. The system of claim 1 , wherein the at least one engaging surface is spaced a distance from a central surface of the central region.

3. The system of claim 1 , wherein the at least one finger includes at least three fingers extending radially from the central region and spaced around the central region.

4. The system of claim 3 , wherein each of the at least three fingers has at least one of the at least one engaging surface;
wherein each of the at least one engaging surface is configured to selectively engage a portion of the subject during positioning of a prosthesis with the first member.

5. The system of claim 4 , wherein each finger of the at least three fingers includes a tab, wherein each at least one engaging surface is formed on the tab;
wherein at least one tab of at least one finger has a length different than at least one other tab of at least the other two fingers.

6. The system of claim 2 , further comprising:
a spring positioned between the first member and the sleeve to resiliently position the first member relative to the sleeve member.

7. The system of claim 1 , wherein the first member is configured to fixedly engage the acetabular cup via a threaded connection.

8. A system for placing an acetabular cup, comprising:
a rod extending from a first rod end to a second rod end, the second rod end configured to fixedly engage an acetabular cup;
a sleeve having a length shorter than the rod, the sleeve extending from a first sleeve end to a second sleeve end having a through bore extending through the sleeve configured to slidably receive the rod member and an alignment plate engaging portion at a distal end of the sleeve to hold an alignment plate relative to the sleeve during movement of the first member; and
the alignment plate comprising:
a through bore through which the rod is configured to extend,
a first finger and a second finger both extending from a central region through which the through bore extends, wherein the first finger is spaced a distance from the second finger around the central region, wherein each of the first and second fingers is configured to extend outside an outer circumference of the acetabular cup during placement, and
a first subject engaging surface extending a first distance from the first finger and a second subject engaging surface extending a second distance from the second finger,
wherein first distance and the second distance are selected to achieve a preselected alignment of at least one of the rod or the sleeve when the sleeve is engaged to the alignment plate and the first subject engaging surface and the second subject engaging surface are engaging the subject;

wherein the rod is configured to slide relative to the alignment plate;
wherein the system is configured for placement of the acetabular cup.

9. The system of claim 8 , wherein the alignment plate further includes
a third finger extending from the central region, wherein the third finger is spaced a distance from both the first finger and the second finger around the central region, and
a third subject engaging surface extending a third distance from the third finger.

10. The system of claim 9 , wherein all of the first subject engaging surface, the second third subject engaging surface, and the third subject engaging surface are sized to engage an anatomical projection near an acetabulum of a human subject.

11. The system of claim 9 , wherein the first subject engaging surface is configured to engage a projection near an ilium, the second third subject engaging surface is configured to engage a projection near a pubis, and the third subject engaging surface is configured to engage a projection near an ischium.

12. The system of claim 8 , wherein the alignment plate includes an external thread and the alignment plate engaging portion includes an internal thread to threadably engage the external thread.

13. The system of claim 12 , wherein the sleeve is configured to be assembled to the alignment plate prior to sliding the rod through the through bore of the sleeve.

14. A method of selecting an alignment of a system, comprising:
selecting a dimension of at least a first tab of at least one finger of an alignment plate based at least on an analysis of a subject to achieve a selected alignment of a sleeve relative to the subject;
designing the alignment plate to include the at least the first tab having the selected dimension;
forming the alignment plate to include the at least the first tab having the selected dimension; and
providing the formed alignment plate for use in a procedure to place an acetabular cup, wherein the alignment plate includes:
a first member extending from a first end to a second end, the first member configured to fixedly engage the acetabular cup,
the sleeve having a length shorter than the first member and comprising a throughbore extending through the sleeve configured to slidably receive the first member, and an alignment plate engaging portion at a distal end of the sleeve to hold the alignment plate relative to the sleeve during movement of the first member, and
the alignment plate including a through bore through which the first member is configured to extend and the at least one finger extending from a central region to at least one engaging surface, the at least one finger configured to extend outside of an outer circumference of the acetabular cup during placement, the at least one engaging surface configured to engage a portion of a subject to align the alignment plate and the first member relative to the subject in a predetermined orientation, wherein the first member is configured to move relative to the alignment plate.

15. The method of claim 14 , further comprising:
evaluating image data of the subject and to select the dimension to achieve the selected alignment of the sleeve.

16. The method of claim 15 , further comprising:
receiving the selected alignment of the sleeve from a user.

17. The method of claim 15 , further comprising:
receiving a selected alignment of the acetabular cup after implantation into the subject; and
determining the selected alignment of the sleeve to achieve the selected alignment of the acetabular cup in the subject.

18. The method of claim 14 , wherein forming the alignment plate includes manufacturing the alignment plate with an additive manufacturing process.

Assignees

• Biomet Mfg Llc

Inventors

• Davenport Austen
• Bailey Kirk J
• Eash Christopher
• Berend Keith R

Classifications

• A61F2002/30566

  Helical springs · CPC title

• A61F2/4609 Primary

  of acetabular cups · CPC title

• A61F2002/4687

  Mechanical guides for implantation instruments · CPC title

• A61F2002/4681

  by applying mechanical shocks, e.g. by hammering · CPC title

• A61F2002/4629

  connected to the endoprosthesis or implant via a threaded connection · CPC title