Objective:To analyse the methord and effects of intermaxillary traction(IMT)screws used in the treatment of jaw frac-ture.Methods:In the treatment of 1 68 cases of jaw fracture IMT screws were used for the restoration of normal and stable occlusion. The screw number,position,traction effect and postoperative complications of the treatment were analysed.Results:705 screws were used in 168 patients,4 screws were used in each of 147 cased (88%),6 in 12(7%),5 in 9(5%).336(47.7%)screws were fixed between the roots of first and second premolar,292(41 .4%)between the roots of canine and first premolar,50 (7.1%)be-tween the roots of second premolar and first molar,27(3.8%)between the other tooth roots.Normal postoperative occlusion relation was achived by the use of screws in 92 cases without traction.Occlusion disharmony or deviation was found in 76 cases by the used of screws and was restored to normlal by 1 4-day traction in 71 cases.The total efficiency of the treatment was 97%.Pain of the mucosa surrounding the screws was observed in 23 cases (1 3.7%).Root damage,traction screw loosening and adjacent tooth dislocation were observed in 1 3(1 .8%),1 1 (1 .6%)and 2(0.3%)cases respectively.Conclusion:For the fixation of IMT screws,the posi-tions between tooth root from canine to first molar were most common and safe.The fixation point should be in 5 ~8mm below the gin-gival margin.Use of 4-6 screws can meet treatment need.

Objective:To study the effects of the surgical treatment of nerve avulsion inside and outside the mandibular cannel.Methods:34 patients with trigeminal neuralgia of the third division,received neurotomy and avulsion of inferior alveolar nerve in the mandibular cannel above the lingual or through the mental foramen,concurrently with the avulsion of buccal nerve.Patients were fol-lowed up for 2-4 years.Results:All the operations were successfully completed,The wounds were well-healed.All patients felt that pain disappeared in the area innervated by inferior alveolar nerve.During the 2-4 years of follow-up,no recurrence was found.Conclusion:Inferior alveolar nerve neurotomy and avulsion in the mandibular cannel is simple,safe and effective in the treatment of trigeminal neuralgia of the third division.

Objective:To analyse the effects of mandibular swing approach in the treatment of the tumors in infratemporal fossa. Methods:11 patients with tumors in infratemporal fossa treated by the surgical operation with mandibular swing approach. The mandi-ble cut was at the front of foramina mentale in 5 cases, at the front of mandible angle in 4 cases and at the middle of chin in 2 cases re-spectively. Results:According to the nature, location, size and the relationship of the tumors with peripheral nerve and blood vessels, flexible selection of the position of mandibular cut could fully expose and completely remove the infratemporal fossa tumor. Conclusion:Surgical treatment of the tumors in infratemporal fossa by mandibular swing approach is safe and effective.

Objective The aim of this study is to establish a practical VX2 tumour model less than or equal to 10 mm from large blood vessel(as standard) for HIFU ablation .Methods 15 New Zealand rabbits were involved ,VX2 tumour blocks were inoculated near postcava through spine path ,and tumour rate was observed two weeks later by anatomy and MRI .Results Three experimental rabbits did not survive ,all the rest of the 12 into the tumour ,assembly tumour rate was 100% (12/12);The tumour rate reaching the standard accounted for 75% (9/12) ,the average distance between the tumour and the inferior vena cava was (5 .6 ± 3 .4)mm . Conclusion It is feasible to establish the VX2 tumor model less than or equal to 10 mm from large blood vessel through spine path .

Medical treatment technology has made a lot of breakthrough because of the rapid development of the medical devices industrial.Minimally-invasive and noninvasive medicine is the development tendency of the future medicine.To adapt to the needs of the future medicine,Chongqing medical university exerted much efforts on training of minimally-invasive and noninvasive medical talents.We explored and practiced in aspects of fixing educational conception and goal,building curriculum and teaching content,constructing professional teaching team and developing practice and innovation abilities in order to fill the void of personnel training in the minimally-invasive and noninvasive medical field.

In order to improve students' overall quality,Biomedical Engineering College of Chongqing Medical University has carried out quality development training in the 6 session of the 450 students.The content includes development projects,the queue training,humanities lectures,inspirational film etc.; the objective is to develop the students' mind,develop their team spirit and interpersonal communication skills.College has recruited and assisted professional instructors in the whole training.The centralized training in specific situations gives students a strong spiritual shock and strong positive energy.Before and after the training we use the same questionnaire to students,the results of which have shown that their comprehensive ability,EQ,and cohesion of the class have been improved.

Guided by the demands of society,we have conducted a survey involving job distribution data,knowledge structure,curriculum setting,practical ability and innovation ability training on graduates,and made the investigation and discussion of graduates' quality and social needs.And according to the feedbacks,we have carried out the reform of Biomedical Engineering by insisting on the management philosophy and characteristics of student-centre and the combination of medical science with engineering,making the training goal definite further,constructing a curricula system of the combination of medical science with engineering,outstanding engineering characteristics and strengthening students' engineering practice ability,and carrying out innovation and entrepreneurship education through the whole process of teaching,to improve the teaching quality of Biomedical Engineering specialty.

AIM: To explore interaction and biological behaviou r changes of two kinds of cells-blastocysts and hepatocarcinoma cells in the same microenvi ronment. METHODS:The models of mouse blastocysts co-cultured wit h human hepatoca rcinoma cell lines were established, then biological behaviours and mutual effe c ts of the two kinds of cells in co-culture system were observed. RESULTS: Co mpared with control group, hepatocarcinoma cells with differently invasive and met astatic potential significantly enhanced the rates of blastocyst hatchment , at t achment and outgrowth(P0 05). The blastocyst ha tched and attached to hepatocarcinoma cells with differently invasive and metast atic p otential. Then, differential trophoblasts invaded hepatocarcinoma cells. The clear-cut interfaces were gradually formed between both sides. Hepatocarcinoma cells o n interface showed changes of growth direction and cell shapes and did not inv ade blastocysts. CONCLUSIONS: Hepatocarcinoma cells promoted bla stocyst develo pment. Blastocysts implanted and invaded hepatocarcinoma cells with differentl y i nvasive and metastatic potential in vitro, which indicate that blastocyst i mplan tation in vitro does not relate with the kinds and differential level of int erac tional cells and the low selectivity maybe relate with high adaptability of earl y life.

This paper discussed on the innovative efforts of establishing production-teaching-research platform and multi-channel international cooperation model by Chongqing Medical University. Measures taken included offering theoretical courses across the first-level disciplines of medicine and engineering and encouraging research tasks that involve the cooperation among hospitals , businesses and universities, creating education environment for postgraduates combing medicine and engineering and launching the cultivation of biomedical engineering postgraduates. The aim of these measures was to incorporate the achievements of scientific research innovation into postgraduate education and to improve its quality.

Objective:To explore the feasibility and stability of using oleic acid to establish acute respiratory distress syndrome(ARDS) model in Beagle dogs.Methods:A total of 25 Beagle dogs were injected oleic acid with a speed of 0.25?0.03ml/Kg through jugular vein after being anesthetized.The gas ventilation index,oxygen metabolism,histopathological changes,chest-ray scan and stability of each index after establishing the ARDS situation were continuously monitored and evaluated.Results:All 25 dogs were reached the diagnosis criteria of ARDS in 4.16?0.92 hours after injection of oleic acid,The arterial PaCO2 of the animals was 27.98?8.25mmHg,PaO2 was 65.40?11.48mmHg,and PaO2/FiO2 was 182.3?29.6.After mechanical ventilation treatment,PaO2/FiO2≤200.Pulmonary mesenchyme,and alveolus edema,bleeding,shrinkage and transparent formation were seen under microscope.There was darkness or coarse shadow in the lung by the X-ray scan.Conclusions:Through injection of oleic acid via jugular vein,a Beagle dog ARDS model may be quickly established with stable changes of hemodynamics,pulmonary mechanics and histology.