BONE CEMENT COMPOSITE CONTAINING PARTICLES IN A NON-UNIFORM SPATIAL DISTRIBUTION AND DEVICES FOR IMPLEMENTATION

摘要

One embodiment of the invention comprises a differential composite (160) in which bone cement everywhere or substantially everywhere contains at least some non-zero volume fraction of particles (172, 174), and in which the local volume fraction of particles (172, 174) may vary from place (162) to place (164) in the composite (160) in a controlled manner. The variation may be by identifiable region (162, 164) or may be in the form of a gradient of the local volume fraction of particles (172, 174). In at least some places (164), the local volume fraction of particles (174) may be such that the particles (174) act as crack arrestors. Close to the interface with natural bone (162), the local volume fraction of particles (172) may be greater. In at least some places (162) adjoining natural bone (140), the local volume fraction of particles (172) may be such as to allow bone ingrowth into appropriate region(s) of the composite (160), resulting in improved interfacial shear strength. Methods and apparatuses for producing and delivering the composite (160) are also disclosed, which may include use of an introducer (208) and an expandable basket-type device (48).