Method for strengthening a fractured bone

• US 4,369,772 A
• Filed: 04/28/1980
• Issued: 01/25/1983
• Est. Priority Date: 04/28/1980
• Status: Expired due to Term

• Current Assignee: The Board of Regents of the University of Colorado (University of Colorado System)
• Original Assignee: University of Florida (State University System of Florida)
• Inventors: Miller, Gary J.
• Primary Examiner(s): Thaler, Michael H.
• Assistant Examiner(s): SHEDD, CHARLES W
• Application Number:
  US06/144,052
• Time in Patent Office: 1,002 Days
• Field of Search: 128/92 R, 128/92 BA, 128/92 D, 128/92 BC, 128/92 CA, 128/92 G, 128/92 C
• US Class Current: 606/92
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61L 27/04 Metals or alloys
• CPC Class Codes: A61L 27/16 obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C08L 33/04 Homopolymers or copolymers of esters C08L43/04 takes precedence

Abstract

Method for strengthening a fractured bone which comprises drilling a hole along the axis of the medullary canal of the bone, inserting into the hole a substantially inflexible tube having an outside diameter less than the diameter of the hole, injecting into the tube and around the tube a semisolid hardenable mixture of methyl methacrylate and poly(methyl methacrylate), and allowing time for the mixture to harden.

Claims

1. Method for strengthening a bone which comprises the steps of:

a. opening the body to gain access to one end of said bone;

b. drilling a passageway along the axis of the medullary canal of said bone;

c. inserting into said passageway a substantially elongated inflexible open-ended, hollow, bone-reinforcing, tubular member having an outside diameter less than the diameter of said passageway;

d. injecting into one end of said tubular member after the inserting step c sufficient hardenable semisolid mixture of methyl methacrylate and poly (methyl methacrylate) under superatmospheric pressure to embed said tubular member in said bone by passage of said mixture from the hollow of said tubular member to fill the remaining portions of said passageway, and to fill any cavity in said bone intersected by said passageway with said hollow remaining filled with said mixture;

e. allowing sufficient time for said mixture to harden in and around said tubular member; and

f. closing said body.

2. The method of claim 1 wherein said cavity includes a fracture in said bone which is filled by said mixture.

3. The method of claim 1 further comprising the step of directing said semisolid mixture into said remaining portions of said passageway and into said cavity through lateral openings in said tubular member.

4. The method of claim 1 further comprising the step of directing said semisolid mixture through at least some of the lateral openings in said tubular member which are located adjacent and in general direct alignment to said cavity which cavity extends beyond the limits of said passageway.

5. The method of claim 1 wherein said semisolid mixture is injected into said tubular member under a pressure of 10-250 psig.

6. The method of claim 1 wherein said mixture contains a peroxide catalyst capable of polymerizing said methyl methacrylate.