Objective To develop a new impact device that can cause different levels of spinal cord injury in adult rats so as to provide a scientific means for standard spinal cord injury model in adult rats. Methods First, two laser heads were installed beside the impacting hammer in order to define the dropping point of imparting hammer through the focus of the two tracts of lasers. A height controlled electrocircuit was designed to control the rotation of the minitype dynamo that regulated the height of impacting hammer precisely via the worm gear. Meanwhile, a time controlled electrocircuit was made so as to secure that the process of injury could be finished within 10 millionseconds constantly according to the technique of weight dropping and the principle of electromagnetic electromagnetism respectively. Results The present impact device could produce different levels of spinal cord injury in adult rats within special times, heights and dropping points. Conclusion We have successfully produced an electro-circuit controlled impact device with laser defining position that is simple and easy to use for making controllable and precise injury models.

ObjectiveTo assess gene chip application value in detecting pathogenic bacteria in intracranial infection cases.MethodsPrimers and probes aiming at the specific DNA sequences of 4 kinds of common pathogenic bacteria and 6 kinds of common drug resistance genes (DRGs) were designed and used to identify the bacteria and DRGs among 30 cerebrospinal fluid (CSF) specimens (12 positive,18negative in CSF culture) from patients with intracranial infection using multiplex polymerase chain reaction (mPCR) and gene chip.The results of gene detection were compared with those of CSF culture and drug sensitivity testing.ResultsBacteria were identified and DRGs were detected in 15 specimens; DRGs and 16S gene were detected in 8 specimens; neither bacterium nor DRG was detected in 7 specimens.ConclusionGene chip technique is characterized by its relative sensitivity and rapidity of detecting the pathogenic bacteria in CSF of intraeranial infection cases.