Method of treating an intertrochanteric fracture

• US 5,312,406 A
• Filed: 12/01/1992
• Issued: 05/17/1994
• Est. Priority Date: 12/30/1986
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Inventors: Brumfield, David L.
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): BRITTINGHAM, DEBRA
• Application Number:
  US07/983,831
• Time in Patent Office: 532 Days
• Field of Search: 606/62, 606/64, 606/67, 623/16
• 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 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• 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 and a stem. There is at least one opening through the head of the rod in an angled direction toward the femoral head relative to the longitudinal axis of the rod. The opening is 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 opening and second screw which will also allow sliding compression may be provided to prevent rotation and to adapt the fracture device to a variety of applications.

Claims

1. A method of treating an intertrochanteric fracture of a patient'"'"'s femur that is located generally between the head of the femur and the intramedullary canal, comprising the steps of:

a) inserting an elongated intramedullary rod having a longitudinal axis into the patient'"'"'s femur, wherein the rod has a distal stem portion, a head having a first smooth opening extending therethrough in an angled direction relative to the longitudinal axis of said rod such that when said rod is in position within the intramedullary canal of the femur, the opening is positioned to intersect the longitudinal axis of the rod, and the axis of said opening is directed toward the head of the femur;

b) positioning the rod so that the axis of the smooth opening extends across the fracture and into the head of the femur;

c) inserting a first screw through said first opening in said head and including first and second end portions;

d) said first screw having a threaded surface formed at the first end adapted in use to engage bone tissue of the head of the femur;

e) compressing the fracture using the bone screw while maintaining continuous sliding contact between the bone screw and the rod at the smooth opening;

f) wherein said threaded section is spaced from the first opening during use for maintaining continuous sliding contact between said head of said rod and the first screw, to permit sliding compression of the selected fracture; and

g) wherein in step "f" the cross section of the smooth opening closely conforms to the cross section of the screw so that the smooth opening rigidly affixes the screw in a single angular position relative to the rod, along said axis.

2. The method of claim 1 wherein in step "e", the threaded section of the bone screw is spaced away from the opening during compressing of the fracture.

3. The method of claim 1 wherein in step "e", the opening and the smooth surface of the bone screw are each cylindrically shaped.

4. The method of claim 3 wherein in step "e", the intramedullary rod is surrounded by bone tissue of the femur and in step "c" the bone screw is inserted through bone tissue on opposing sides of the rod at the opening.

5. The method of claim 1 wherein in step "a", the head of the intramedullary rod has a pair of smooth openings that are spaced apart and each opening extending through the intramedullary rod in an angled direction relative to the longitudinal axis of the rod and in step "c", first and second screws are inserted respectively through the openings in the head, each of the screws including first and second end portions, and in step "d", the pair of screws each provide threaded surfaces formed respectively at the first end portion of each screw adapted and used to engage bone tissue of the head of the femur.

6. The method of claim 1 wherein in step "a", the head portion of the rod has a pair of spaced apart, smooth openings extending through the head of the rod in an angled direction relative to the longitudinal axis of the rod and one of the openings has a greater diameter than the other of the openings.

7. The method of claim 6 wherein in step "c", a pair of screws are inserted respectively through the pair of openings in the head, each screw including first and second end portions.

8. The method of claim 1 wherein the screw has a self-tapping threaded end portion.

9. The method of claim 1 wherein in step "a", the elongated intramedullary rod has a longitudinal bore surrounded by an intramedullary rod side wall, and the side wall of the rod is thicker at the head than the side wall of the rod at the distal stem.