The paper is dedicated to the enhancement of Polycrystalline Diamond Bits (PDC) designed for oil and gas industry. A novel diamond-reinforced composite was applied cutting inserts, with addition 4 wt% chromium diboride WC-Co matrix. CrB2 ensured improvement bending strength fracture toughness by nearly 30% 40%, respectively, enhanced diamond retention force. efficiency PDC bits further improved...

The aim of the present study was to develop an animal model of pulmonary fat embolism (PFE) caused by femoral intramedullary procedures, and to investigate the initial changes in the hemodynamics, cytokines and risk factors of PFE. Sixteen dogs were randomly divided into two groups: Group A (intramedullary reaming and bone cement injection, n=8) and Group B (surgical approach without opening th...

BACKGROUND Transforming growth factor-beta (TGF-beta) and bone morphogenetic proteins (BMPs) utilize parallel and related signaling pathways, however the interaction between these pathways in bone remains unclear. TGF-beta inhibition has been previously reported to promote osteogenic differentiation in vitro, suggesting it may have a capacity to augment orthopaedic repair. We have explored this...

BACKGROUND This study was undertaken to determine whether alveolar dead space increases during intramedullary nailing of femoral shaft fractures and whether alveolar dead space predicts postoperative pulmonary dysfunction in patients undergoing intramedullary nailing of a femoral shaft fracture. METHODS All patients with a femoral shaft fracture were prospectively enrolled in the study unless...

Abstract Background The depth of bolt in Femoral neck system (FNS, DePuy Synthes, Oberdorf, Switzerland) is difficult to finely control as the length units 5 mm. Thus, this study introduces a method FNS analogue scale patients with femoral fracture. Methods By technique reaming and retraction bolt, tip implant could be positioned close subchondral bone without harming it. position four cases wh...

BACKGROUND Management of tibial fractures associated with soft tissue injury remains controversial. Previous studies have assessed perfusion of the fractured tibia and surrounding soft tissues in the setting of a normal soft tissue envelope. The purpose of this study was to determine the effects of muscle contusion on blood flow to the tibial cortex and muscle during reamed, intramedullary nail...