Objective To develop a new scalpel which can be used in flap dissection at breast surgery and to investigate the method by which clinicians could improve the research and development of the new surgical instruments. Methods SolidWorks software was used to turn the design ideas into 3D format on personal computer, and the engineering drawing was applied for patent before being submitted to manufacturers. Results Engineering drawing met the requirements of patent application and production, and then the model smoothly entered into animal experiments. Conclusion Clinicians should study and utilize some kinds of computer aided design (CAD) software so as to not only avoid lots of modifications during trial production, but also shorten the design cycle and improve production efficiency. This method may serve as a reference for other designs.

The article introduces the training of basic skill,renovating of the experiment contents,the diversifi cation and abundance in interest of experiment teaching methods of the students of medical laboratory speciality of higher profession.

Objective To evaluate the effect of different degrees of pubic symphysis diastasis on the stress distribution of posterior pelvic ring. Methods Eight embalmed pelvis and articulated proximal 1/3 of the femurs were harvested for this study. The samples were positioned as both legs standing straight and loaded to 600 N on the on the CSS-44020 biomechanical machine. The strain gages were adhered to 38 sites distributed symmetrically on the two sides of sacroiliac joint, anterior sacrum and posterior ilium. The strain gages were connected to WS3811 digital strainometer to record strain changes of the intact pelvic ring and at 1,2, 2.5 cm of pubic symphysis diastasis. Results Elastic changes occurred in the cortical bone of the pelvis under 600 N load. The symmetrical sites had similar strain changes without significant difference in the intact pelvic ring and at 1,2, 2.5 cm of pubic symphysis diastasis ( P ＞0.05 ). The sites with more strain changes were distributed on the iliofemoral arch in the intact pelvis.The strain changes were increased significantly frona the posterolateral sites to the iliofemoral arch. But the strain changes on the iliofemoral arch were decreased significantly during pubic symphysis diastasis.Conclusion The conduction of vertical load runs along the sacrofemoral arch in the intact pelvic ring and redistributes posterolaterally during pubic symphysis diastasis.