Modular femoral fixation system

• US 5,364,398 A
• Filed: 09/21/1992
• Issued: 11/15/1994
• Est. Priority Date: 06/23/1986
• Status: Expired due to Term

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Pfizer Hospital Products Group, Inc. (Pfizer Inc.)
• Inventors: Mears, Dana C., Chapman, Michael W., Edwards, Charles C.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Wilkens, Frank
• Application Number:
  US07/948,193
• Time in Patent Office: 785 Days
• Field of Search: 606/69-71, 606/86
• US Class Current: 606/71
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/725 with locking pins or screws of special form
• CPC Class Codes: A61B 17/7266 with fingers moving radially outwardly
• CPC Class Codes: A61B 17/7283 with special cross-section of the nail
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/8061 specially adapted for particular bones A61B17/70 and A61B17/74 take precedence
• CPC Class Codes: Y10S 606/902 Cortical plate specifically adapted for a particular bone
• CPC Class Codes: Y10S 606/907 Composed of particular material or coated

Abstract

A modular femoral internal implant system for use in the treatment of femoral disorders resulting from injury, disease or congenital defect includes at least three interconnectable components: 1) an elongated epiphyseal/metaphyseal implant, 2) an intramedullary rod and 3) an angled side plate having an elongated plate portion adapted to be secured to the outer cortical wall and a hollow sleeve adapted to extend into the femur. The epiphyseal/metaphyseal implant can be connected to either the angled side plate or the intramedullary rod. The system may also include an elongated bone plate connectable to the angled side plate, one or more additional epiphyseal/metaphyseal implants of variable length, an additional angled side plate, a distal buttress plate connectable to the elongated bone plate, and a plurality of bone screws of a universal design. Preferably, many or all of the components of the system are made of an inert, resilient titanium-base alloy.

Claims

1. A distal buttress plate adapted to be secured to the outer cortical wall of the lateral distal femur by means of bone fasteners received in apertures in said plate, said plate including a relatively flat elongated proximal portion adapted to be secured to the lateral distal femoral shaft and a relatively curved distal portion curved out of the plane of said proximal portion adapted to be secured to the lateral distal femoral condyle,

with said distal portion being three dimensionally-contoured to replicate the mean geometry of the lateral femoral condyle of adult humans, wherein said distal portion includes a generally rounded head at the distal end of said buttress plate and includes located adjacent to said generally rounded head, a generally widened body, and wherein said generally widened body and said generally rounded head are separated by a neck portion.

2. A distal buttress plate according to claim 1, wherein said generally rounded head has a maximum width w, wherein said generally widened body has a maximum width W'"'"', wherein said neck has a minimum width W, wherein said proximal portion has a width y, and wherein W'"'"' is greater than both w and y and wherein W is substantially smaller than w and W'"'"'.

3. A distal buttress plate according to claim 2, wherein said distal buttress plate has a lower surface which is contoured to conform along its entire length to the outer cortical wall of said distal femur.

4. A distal buttress plate according to claim 1, wherein said generally rounded head includes an elongated aperture capable of accommodating multiple bone fasteners provided in said distal portion.

5. A distal buttress plate according to claim 1, wherein said generally widened body includes at least one elongated aperture capable of accommodating multiple bone fasteners provided in said distal portion.

6. A distal buttress plate according to claim 5, wherein said generally widened body includes two elongated apertures capable of accommodating multiple bone fasteners provided in said distal portion.

7. A distal buttress plate according to claim 1, wherein said neck portion is configured in such a manner that spaces are left outside the periphery of said distal buttress plate against said neck for accommodating two lag screws.

8. A distal buttress plate according to claim 1, wherein said proximal portion has included in the lower surface thereof an elongated cavity which is adapted to serve in a dovetail interlocking capacity with a mated dovetailed bone plate.

9. A distal buttress plate adapted to be secured to the outer cortical wall of the lateral distal femur by means of bone fasteners received in apertures in said plate, said plate including a relatively flat elongated proximal portion adapted to be secured to the lateral distal femoral shaft and a relatively curved distal portion curved out of the plane of said proximal portion adapted to be secured to the lateral distal femoral condyle, wherein said distal portion includes a generally rounded head at the distal end of said buttress plate and includes located adjacent to said generally rounded head, a generally widened body, wherein said generally widened body and said generally rounded head are separated by a neck portion,

with at least one elongated aperture capable of accommodating multiple bone fasteners being provided in at least one generally rounded portion of said distal portion.