Traitement en cours

Veuillez attendre...

Paramétrages

Paramétrages

Aller à Demande

1. AU2007212265 - Guide assembly for guiding cuts to a femur and tibia during a knee arthroplasty

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
1. An assembly for guiding resection of a femur and tibia of a knee joint having tissue structures connecting the femur and tibia in preparation for installation of a femoral and tibial knee component, said assembly comprising:
a femoral member configured for fixation to the femur; a tibial member configured for fixation to the tibia;
a tensioning assembly configured to adjust relative positioning of the femoral member and tibial member with respect to each other to a desired amount of tension in the tissues structures of the knee; and
at least one cutting guide configured to attach to at least one of the femoral member, tibial member or the tensioning assembly and guide cutting at least one of the tibia or the femur.
2. An assembly of Claim 1, wherein the tensioning assembly includes a torque mechanism configured to distract the femoral member and tibial member in response to application of a controlled torque.
3. An assembly of Claim 1, wherein the tensioning assembly includes a tensioning mechanism configured to distract the femoral member and tibial member in response to application of a controlled or tensioning force.
4. An assembly of Claim 2, wherein the femoral member includes a femoral mount and the tibial member includes a tibial mount and wherein the torque mechanism includes a threaded portion configured to mate with a threaded opening defined in one of the femoral mount or tibial mount.
5. An assembly of Claim 2, wherein the torque mechanism defines a threaded opening.
6. An assembly of Claim 4, wherein the torque mechanism is a ratchet mechanism.
7. An assembly of Claim 2, wherein the femoral mount defines an opening and the tibial mount defines an opening, and one of the openings is threaded and the other one of the openings is unthreaded, and the torque mechanism includes a first end configured to extend within the unthreaded one of the openings and a threaded portion configured to extend into the threaded one of the openings.
8. An assembly of Claim 7, wherein the torque mechanism includes at least one torque-wrench attachment surface allowing rotation of the threaded portion relative to the threaded one of the openings so as to distract the tibial mount from the femoral mount.
9. An assembly of Claim 8, wherein the femoral member includes a femoral IM rod extending from the femoral mount and configured for insertion into a medullary canal of the femur and wherein the tibial member includes a tibial IM rod extending from the tibial mount and configured for insertion into a medullary canal of the tibia.
10. An assembly of Claim 9, wherein the opening defined in the femoral mount extends in an anterior-posterior direction relative to the femur and wherein the opening defined in the tibial mount extends proximal-distal relative to the tibia.
11. An assembly of Claim 10, wherein the opening in the tibial mount is threaded and the opening in the femoral mount is unthreaded.
12. An assembly of Claim 10, wherein the femoral mount has a curved surface and wherein the tibial mount further includes a block with a curved surface configured to receive the curved surface of the femoral mount and allow varus-valgus rotation of the tibial member with respect to the femoral member.
13. An assembly of Claim 12, wherein the femoral mount has a cylindrical shape with an axis extending in the anterior-posterior direction relative to the femur and wherein the curved surface of the block has an arc-shape with an axis extending in the anterior-posterior direction relative to the tibia.
14. An assembly of Claim 13, wherein the opening in the femoral mount extends along the axis of the femoral mount and includes anterior and posterior ends, wherein the posterior end of the femoral mount is configured to receive one of the ends of the torque mechanism and wherein the anterior end is configured to receive a portion of the cutting guide.
15. An assembly of Claim 14, wherein at least one of the tibial and femoral mounts includes markings indicating varus-valgus angulation of the tibial and femoral members.
16. An assembly of Claim 1, wherein the tensioning assembly is configured to adjust relative positioning of the tibia and femur at different angles of knee flexion.
17. An assembly of Claim 16, wherein the different angles of knee flexion include at least full extension and a flexion angle of greater than about 60 degrees.
18. An assembly of Claim 17, wherein the flexion angle of greater than about 60 degrees is about 90 degrees.
19. An assembly of Claim 1, wherein the femoral member includes a femoral IM rod configured to be inserted into a medullary canal of the femur and the tibial member includes a tibial IM rod configured to be inserted into a medullary canal of the tibia.
20. An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installation of a femoral and tibial knee components, said assembly comprising:
a femoral IM rod configured to extend within a medullary canal of the femur and a tiblial IM rod configured to extend within a medullary canal of the tibia;
at least one mount secured to one of the femoral or tibial IM rods; at least one cutting guide configured to guide cuts to at least one of the femur or the tibia in preparation for attachment of the knee components; and an outrigger frame having at least one arm with a first end and a second end, the first end of the arm configured to connect to the mount so that the arm extends generally anteriorly out of an opening defined in soft tissues surrounding the knee joint and the second end of the arm configured to support the cutting guide.
21. An assembly of Claim 20, wherein one of the mount and the first end of the arm are secured using an opening configured to extend in the anterior-posterior direction, said opening being defined in one of the mount or the first end of the arm.
22. An assembly of Claim 21, wherein the opening is defined in the mount and the mount is configured to be secured to the femoral IM rod.
23. An assembly of Claim 22, wherein the first end of the arm includes a locking mechanism configured to secure the first end of the arm within the opening defined in the mount.
24. An assembly of Claim 23, wherein the outrigger frame comprises a second arm configured to attach to the first arm and to support the cutting guide.
25. An assembly of Claim 20, wherein the cutting guide is one of a flexion cutting gide, an extension cutting guide, a tibial cutting guide or a femoral cutting guide.
26. An assembly of Claim 20, wherein the arm and the cutting guide are configured to have a width of less than 5 cm in the medial-lateral direction when secured to the knee.
27. An assembly of Claim 20, wherein the arm and the cutting guide are configured to have a width of less than 5 cm in the medial-lateral direction when secured to the knee.
28. An assembly of Claim 20, wherein the arm and the cutting guide are configured to have a width of less than 4 cm in the medial-lateral direction when secured to the knee.
29. An assembly of Claim 20, further comprising a tibial angulation guide configured to connect to a proximal end of the tibial intramedullary rod, extend around at least a portion of the mount and register an angle between the tibia and the femur.
30. An assembly for guiding resection of a femur and tibia of a knee joint in preparation for installation of a femoral and tibial knee components, said assembly comprising:
a femoral intramedullary rod configured to extend within a medullary canal of the femur and a tibial intramedullary rod configured to extend within a medullary canal of the tibia;
a femoral mount configured to connect to a distal end of the femoral intramedullary rod and defining an opening extending anteriorly and posteriorly through the femoral mount;
a tibial angulation guide configured to connect to a proximal end of the tibial intramedullary rod, extend around at least a portion of the femoral mount and register an angle between the tibia and the femur;
a flexion position cutting guide configured to guide cuts to at least one of the femur or the tibia while the knee is in flexion in preparation for attachment of the knee components, said flexion position cutting guide defining an attachment opening;
an outrigger frame having a first and a second arm connected by a base member, wherein the first arm of the outrigger frame includes a first locking mechanism configured to extend through the anterior-posterior opening defined in the femoral mount and lock the outrigger frame thereto when the knee joint is in flexion, wherein the base member extends generally anteriorly out of an opening defined in soft tissues surrounding the knee joint and wherein the second arm extends perpendicular to the base member and parallel to the first arm and is configured to extend through the attachment opening of the extension position cutting guide to provide support therefore;
an extension position cutting guide configured to guide cuts to at least one of the femur or the tibia while the knee is in extension in preparation for attachment of the knee components, said extension position cutting guide defining an attachment opening; and
a second locking mechanism configured to extend posteriorly through the attachment opening of the flexion position cutting guide and the anterior posterior opening defined in the femoral mount and to lock the flexion position cutting guide to the femoral mount.
31. An assembly of Claim 1, wherein the femoral member includes a hinged femoral mount which allows a retractor to be placed through a hole in the femoral mount that serves as a fulcrum and lever arm to displace a tibia anterior for exposure to place the total knee arthroplasty tibial implant.
32. An assembly of Claim 1, wherein one or more retractors facilitate exposure of the knee.
33. An assembly of Claim 1, wherein small versions of the total knee arthroplasy implants with the same thickness and radii are placed centrally in the knee and fitted into the holes in the femoral and tibial IM rods to allow for trial testing of the alignment, ligament balance, and stability of the knee preparation.
34. An assembly of claim 33, wherein the small implants are a stand alone total knee arthroplasty.