Modular femoral fixation system

• US 5,190,544 A
• Filed: 03/18/1991
• Issued: 03/02/1993
• 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): Hafer, Robert A.
• Assistant Examiner(s): Rimell, Sam
• Application Number:
  US07/670,839
• Time in Patent Office: 715 Days
• Field of Search: 606/53, 606/60, 606/62, 606/63, 606/65, 606/66, 606/69, 606/70, 606/71, 606/72, 606/73, 606/86, 606/105
• 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 17/744 the longitudinal elements coupled to an intramedullary nail
• 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

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 bone implant assembly comprising:

an elongated bone plate adapted to be secured to a patient'"'"'s bone having an upper surface, a lower surface intended to be adjacent the patient'"'"'s bone in use and two side surfaces connecting the upper and lower surfaces, with the thickness of the plate being substantially constant between the two side surfaces, the width of the upper surface being greater than the width of the lower surface, said side surfaces being tapered inwardly toward one another from said upper surface to said lower surface, with said bone plate being adapted to be secured to the patient'"'"'s bone by means of bone fasteners received in apertures in the bone plate, and

a surgical implant having an elongated plate portion, having an upper surface and a lower surface, adapted to be secured to the patient'"'"'s bone by means of bone fasteners received in apertures in said elongated plate portion, with a cavity being formed in the lower surface of the elongated plate portion at a free end of said plate portion, said cavity extending longitudinally from said free end to a shoulder defining an end of the cavity and said cavity having a transverse cross-section complementary to that of said elongated bone plate so that said elongated bone plate can enter and be removed from said cavity only by relative axial movement between said elongated bone plate and said elongated plate portion, and with at least one of said bone fastener-receiving apertures in said elongated plate portion, which at least one aperture is in communication with said cavity, overlying a bone fastener-receiving aperture in said elongated bone plate when said bone plate is inserted into said cavity and an end of said bone plate abuts said shoulder.

2. A bone implant assembly of claim 1 wherein said surgical implant is an angled side plate.

3. A bone implant assembly of claim 1 wherein said surgical implant is a distal buttress plate.

4. A bone implant assembly of claim 3 wherein said distal buttress plate is 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 comprising a generally rounded head at the distal end of the plate and a generally widened body having a greater maximum width than both said head and said proximal portion, with said head and body being connected by a neck having a minimum width substantially smaller than the maximum widths of said head and body so as to leave spaces for the accommodation of a pair of fracture reproduction lag screws against said neck on the two sides of said neck.

5. 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 comprising a generally rounded head at the distal end of the plate and a generally widened body having a greater maximum width than both said head and said proximal portion, with said head and body being connected by a neck having a minimum width substantially smaller than the maximum widths of said head and body so as to leave spaces for the accommodation of a pair of fracture reduction lag screws against said neck on the two sides of said neck.

6. A distal buttress plate of claim 5 provided with at least one elongated aperture in said head and a pair of elongated apertures in said body, one on each side of the body.