Fermoral fracture device

• US 4,827,917 A
• Filed: 12/30/1986
• Issued: 05/09/1989
• Est. Priority Date: 12/30/1986
• Status: Expired due to Term

• Current Assignee: Richards Medical Company
• Original Assignee: Richards Medical Company
• Inventors: Brumfield, David L.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Colosimo, Mark F.
• Application Number:
  US06/947,656
• Time in Patent Office: 861 Days
• Field of Search: 128/92 YZ, 128/92 YY, 128/92 YV
• US Class Current: 606/64
• CPC Class Codes: A61B 17/1721 for applying pins along or parallel to the axis of the femoral neck
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence

Abstract

An apparatus for treating fractures of the femur including a screw and an intramedullary rod. The screw has a threaded portion and a smooth portion. The rod has a head, stem and a longitudinal bore. There is at least one pair of coaxial holes through the stem, transverse to the longitudinal axis of the rod, for receiving first anchoring means, such as a nail, screw or bolt, to secure the rod within the marrow canal of the femur. There are at least a proximal pair of coaxial holes and a distal pair of coaxial holes in the head of the rod in an angled direction toward the femoral head relative to the longitudinal axis of the rod. The distal pair of head holes are adapted to slidingly receive the screw to permit the threaded portion of the screw, in use, to engage the femoral head and to allow sliding compression of a femoral neck or intertrochanteric fracture. An optional second anchoring means which will also allow sliding compression and an optional set screw are also provided to adapt the fracture device to a variety of applications.

Claims

1. Apparatus for treating fractures of the femur comprising:

an intramedullary rod having a longitudinal axis and defining a coaxial bore therethrough, said rod having a proximal head and a stem distal thereto, and being adapted in use for insertion into the marrow canal of a femur;

said stem having at least one pair of stem holes, both holes of said at least one pair of stem holes being coaxially arranged on a common axis extending through said bore in a transverse direction relative to the longitudinal axis of said rod;

said head having at least a distal pair of head holes and a proximal pair of head holes, both holes of each said distal and proximal pairs of head holes being coaxially arranged on a common axis extending through said bore in an angled direction relative to the longitudinal axis of said rod such that when said rod is in position within the marrow canal of the femur said axes of said distal and proximal head holes are directed toward the head of the femur, said common axes of said distal and proximal pairs of head holes being generally parallel to each other; and

a screw for insertion through said distal pair of head holes, said screw having a threaded surface formed at the end adapted in use to engage the head of the femur and a smooth surface formed on the remaining major portion of its length, said smooth surface being adapted in use for continuous sliding contact with said head of said rod through said distal pair of head holes to permit sliding compression of selected fractures.

2. The apparatus recited in claim 1 further comprising:

first anchoring means adapted in use to pass through the femur and said pair of stem holes to secure said rod within the marrow canal of the femur.

3. The apparatus recited in claim 1 further comprising:

second anchoring means adapted in use to be optionally insertable through a portion of the femur and said proximal pair of head holes to prevent rotation of the head of the femur, said second anchoring means having a threaded portion and a smooth portion for continuous sliding contact with said rod through said proximal pair of head holes.

4. The apparatus recited in claim 1 further comprising:

a set screw adapted in use to be optionally insertable into the portion of said bore in said head to wedgedly engage said screw when said screw is inserted through said distal pair of head holes to secure the position of said screw relative to said rod.

5. The apparatus recited in claim 1 wherein there are two pairs of stem holes and said common axes of said pairs of stem holes are generally parallel to each other, said apparatus further comprising two first anchoring means, each said first anchoring means adapted in use to pass through the femur and one of said pair of stem holes to secure said rod within the marrow canal of the femur.

6. The apparatus recited in claim 1 wherein the diameter of said distal pair of head holes is greater than the diameter of said proximal pair of head holes.

7. The apparatus recited in claim 1 wherein said bore has a closed cross section along its entire length and the exterior cross section of said rod is scalloped and the interior cross section resembles a cloverleaf in shape.

8. The apparatus recited in claim 1 wherein said longitudinal axis curves in at least one portion of said stem through one plane to align said rod along the length of the marrow canal of the femur when said rod is inserted in the femur.

9. The apparatus recited in claim 1 wherein said screw includes means for permitting said screw to be tightened relative to said rod to compress a fracture.

10. The apparatus recited in claim 1 wherein said screw is cannulated to permit insertion of a guide wire.