Orthopaedic cement from acrylate polymers
First Claim
Patent Images
1. An improved orthopaedic cement comprising acrylate matrix polymer together with a powder formed of a second acrylate polymer which second polymer has a solubility parameter within about 0.2 units from the monomer from which said matrix polymer is formed, which has a glass transition temperature below human body temperature (37°
- C.) and which, at said human body temperature, is substantially more extensible than said matrix polymer;
said cement, when implanted in the human body, at body temperature being a composite material consisting of relatively rubbery polymer particles embedded in a rigid, glassy matrix of polymethyl methacrylate and having a setting time of about ten to fifteen minutes.
0 Assignments
0 Petitions
Accused Products
Abstract
An improved orthopaedic cement of the type used to, e.g. position and hold prosthetic devices in place within bone cavities after surgical repair of the bone system. The cement is characterized by markedly increased toughness and resistance to fracture due to the rubbery, or elastomeric, nature of the included polyacrylate resin phase.
-
Citations
10 Claims
-
1. An improved orthopaedic cement comprising acrylate matrix polymer together with a powder formed of a second acrylate polymer which second polymer has a solubility parameter within about 0.2 units from the monomer from which said matrix polymer is formed, which has a glass transition temperature below human body temperature (37°
- C.) and which, at said human body temperature, is substantially more extensible than said matrix polymer;
said cement, when implanted in the human body, at body temperature being a composite material consisting of relatively rubbery polymer particles embedded in a rigid, glassy matrix of polymethyl methacrylate and having a setting time of about ten to fifteen minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- C.) and which, at said human body temperature, is substantially more extensible than said matrix polymer;
-
10. An orthopaedic cement comprising, at human body temperature, a relatively rubbery polymer in a rigid matrix polymer:
-
said relatively rubbery polymer being poly n-butyl methacrylate which in use condition has an elongation of at least 90%, a tensile modulus of at least 200 psi and a glass transition temperature below said human body temperature (37°
C.);said rigid matrix polymer being polymethyl methacrylate; the solubility parameters of said rigid matrix polymer and said relatively rubbery polymer being within about 0.2 units; and said cement being characterized by withstanding a fracture stress of about 20 dynes/cm2, having a modulus of less than about 2×
1010 dynes/cm2,;
including an X-ray opacifying quantity of filler and having a setting time of ten to fifteen minutes.
-
Specification