Femoral Implant

Patent metadata

Field	Value
Publication number	US-2021220150-A1
Application number	US-202117154662-A
Country	US
Kind code	A1
Filing date	Jan 21, 2021
Priority date	Jan 22, 2020
Publication date	Jul 22, 2021
Grant date	—

Abstract

A method comprising cutting a channel through a femoral neck and into a femoral head of a femur, and inserting a femoral implant within the channel such that a porous portion of the femoral implant is positioned within the femoral head and a resorbable portion of the femoral implant is positioned within the femoral neck, the porous portion being coupled to the resorbable portion and extending therefrom along a longitudinal axis of the femoral implant, the resorbable portion having a cross-sectional area defined in a plane extending transverse to a longitudinal axis of the femoral implant, the cross-sectional area of the resorbable portion consisting essentially of a resorbable material.

First claim

1 . A method comprising:
cutting a channel through a femoral neck and into a femoral head of a femur; and inserting a femoral implant within the channel such that a porous portion of the femoral implant is positioned within the femoral head and a resorbable portion of the femoral implant is positioned within the femoral neck, the porous portion being coupled to the resorbable portion and extending therefrom along a longitudinal axis of the femoral implant, the resorbable portion having a cross-sectional area defined in a plane extending transverse to a longitudinal axis of the femoral implant, the cross-sectional area of the resorbable portion consisting essentially of a resorbable material.

2 . The method of claim 1 , wherein the porous portion is inserted such that the porous portion is positioned entirely within the femoral head. The method of claim 1 , wherein the resorbable portion is inserted such that a length of the resorbable portion is positioned within the trochanteric region of the femur.

4 . The method of claim 1 , further comprising securing the femoral implant to the femur by rotatably engaging a helical thread adjacent a trailing end of the resorbable portion with the femur.

5 . The method of claim 4 , wherein securing the femoral implant includes:
engaging an instrument with the trailing end of the implant; and rotating the instrument to engage the set of threads with the femur.

6 . The method of claim 1 , wherein the resorbable material is selected from one of polylactic acid, polyglycolic acid, magnesium, magnesium alloys, hydroxyapatite, and tricalcium phosphate.

7 . The method of claim 1 , wherein the porous portion is made from one of titanium, stainless steel, cobalt-chromium, and niobium.

8 . The method of claim 1 , wherein the porous portion comprises a porous outer surface having a porosity adapted to promote bony ingrowth.

9 . A method comprising:
cutting a channel through a femoral neck and into a femoral head of a femur; and inserting a femoral implant within the channel such that a first portion of the femoral implant is positioned within the femoral head and a second portion of the femoral implant is positioned within the femoral neck, the first portion comprising a porous material adapted to promote bony ingrowth, and the second portion consisting essentially of a resorbable material.

10 . The method of claim 9 , wherein the first portion and second portion join at an intermediate section of the femoral implant such that the first portion extends from the intermediate section to a distal end of the femoral implant and the second portion extends from the intermediate section to a proximal end of the femoral implant.

11 . The method of claim 9 , wherein the inserting step includes threadedly engaging the femur with a thread of the femoral implant.

12 . The method of claim 11 , wherein the thread is disposed along the second portion.

13 . The method of claim 11 , wherein the inserting step includes engaging recess at the proximal end of the femoral implant with an instrument and rotating the femoral implant within the channel via the instrument.

14 . The method of claim 9 , wherein the first portion is made from one of titanium, stainless steel, cobalt-chromium, and niobium.

15 . The method of claim 14 , wherein the resorbable portion is made from one of polylactic acid, polyglycolic acid, magnesium, magnesium alloys, hydroxyapatite, and tricalcium phosphate.

16 . The method of claim 9 , wherein the first portion has a projection extending partially into the second portion so as to secure the first portion to the second portion.

17 . A method of preparing a femur for a joint prosthesis after a femoral implant had been implanted to treat avascular necrosis, comprising:
cutting through a femoral neck of a femur and an area of the femoral neck where a portion of a previously implanted femoral implant has been at least partially resorbed within the femoral neck so as to remove a femoral head of the femur and a porous portion of the femoral implant disposed within the femoral head; cutting through a trochanteric region of the femur and into an intramedullary canal thereof to form a channel for a joint prosthesis; and inserting a stem of a joint prosthesis within the channel.

18 . The method of claim 17 , wherein cutting through the femoral neck region includes resecting a femoral head containing the porous portion of the femoral implant without contacting the porous portion.

19 . The method of claim 17 , cutting through the trochanteric region includes removing at least a portion of the femoral neck where the portion of the previously implanted femoral implant has been at least partially resorbed within the femoral neck.

Assignees

• Howmedica Osteonics Corp

Inventors

• Gibbons Rachel
• Kaverina Tatyana
• Hanssen Arlen Dale

Classifications

• A61F2002/30224

  cylindrical · CPC title

• A61F2002/3093

  for promoting ingrowth of bone tissue · CPC title

• A61F2/3603

  implanted without ablation of the whole natural femoral head (endoprosthetic cartilage A61F2/30756) · CPC title

• A61F2002/30408

  Conical threadings · CPC title

• A61F2002/3092

  having an open-celled or open-pored structure · CPC title