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Biomedical subjects

Li Teng

Publications and source records attributed to Li Teng.

24 records · Page 2Linked to original sources
PubMed2002

[The autotransplanted tracheas wrapped in united muscle flap of the neck: an experiment].

OBJECTIVE: To investigate the way of revascularization of donator's trachea wrapped in united muscle flap. METHODS: Using fiberoptic bronchoscopy, histopathology and microangiography, we evaluated the tracheal mucosal blood flow, the survival rate, the percentage of patency, and the graft viability of autograft tracheas with varying lengths wrapped in one-sided sternocephalic muscle flap and two-sided sternohyoid-sternothyroid muscle flap and autograft tracheas with the length of 5 rings without wrapped in muscle flap in 32 dogs. RESULTS: In the tracheal autograft wrapped in the united muscle flap group with a length less than 4 centimeters, the submucosal blood flow of graft could be detected by laser blood flowmetry one week after transplantation, and it reached 60% of the normal, which had no significant difference between the place near the site of anastomosis and the middle part of the graft. Dense vessels could be found to grow from the wrapped muscles into the autografted trachea by microangiography. Histopathological examination demonstrated that the structure of the autograft was the same as what it originally was. the inner surface of the autograft was covered with pseudostratified columnar ciliary epithelia, and no necrotic tracheal cartilages were found. Every autograft could survive over long time. However, at 1 week, most mucous membrane in the middle part of the graft with length over 4 cm was in gray or in pale; hyperemia, edema, and haemorrhage were found near the site of anastomosis. Mucosal blood flow measured by laser blood flowmetry in the middle part of the graft was significantly less than that near the site of anastomosis. Malacia, dissolution or granulation hyperplasia occurred in midportion of the major grafts shortly after transplanatation. As for those autografted trachea without wrapping in muscles flap, mucous membranes turned black one week after the transplantation and all dogs died of graft necrosis later. CONCLUSION: One-sided sternocephalic muscle flap and two-sided sternohyoid-sternothyroid muscle flap can provide blood for the graft and the grafted trachea can survive for a long time.

Animals↗
PubMed2002

[The experimental study of bioabsorbable mini-plate for rigid fixation on rabbits].

OBJECTIVE: To study the biodegradation process of the bioabsorbable mini-plate (LactoSorb) and its influence on bone healing. METHODS: 15 mature New Zealand White Rabbits were selected as the experimental animals. The bilateral zygomatic arch were fractured using a fissure bur. One side was fixed with the bioabsorbable mini-plate and the other side was fixed with Titanium mini-plate as a control. 5 animals were killed after 4, 12, and 24 weeks post operation respectively for radiographic and histologic study. RESULTS: At 4 weeks, the absorbable plate changed from transparent to opaque and its dimensions was enlarged. The bone gaps of both groups were filled with new bone. No inflammatory cells were found in both groups. At 12 weeks, the absorbable plate broke to small pieces or particles, its dimensions reduced greatly but the outline could still been recognized. The bone continuity had been reestablished in both groups. At 24 weeks, the absorbable plate was resorbed completely. Only the residual screw could be seen in the screw hole. Complete bone healing was seen in both groups. No histological differences of bone healing were found at this stage. CONCLUSION: The absorbable plate demonstrates excellent biocompatibility. No adverse local inflammatory reactions were found during the plate was absorbed gradually. In the non-weight baring area, the absorbable plate provides the same fixation stability as that of the metal plate.

Absorption↗
PubMed2002

[Three-dimensional observation of the vasculature in the anterolateral thigh adipofascial flap and its clinical applications].

OBJECTIVE: To investigate the blood supply patterns of the anteriorlateral thigh adipofascial flap for clinical applications. METHODS: To investigate the blood supply patterns of the anteriorlateral thigh (ALT) adipofascial flap, 16 fresh cadavers were anatomically examined by intraarterial injection of colored latex. Three-dimensional analysis of the vasculature of the subcutaneous adipofascial tissue was performed. Sixteen patients underwent microsurgical correction with the ALT adipofascial flap. Among them, there were fifteen with hemifacial atrophy, one with micromastia. RESULTS: The three-dimensional arterial structures of the ALT adipofascial flap were the same in all the cadaver specimens. Each layer of the adipofascial tissue was supplied by several blood vessels of the axial pattern, especially in the deep layer. Sixteen patients were successfully treated with this flap. The postoperative follow-up ranged from six months to eleven years. There was not postoperative flap necrosis or absorption of the fatty tissue. Stable restoration of the facial contour or the breast was achieved. The donor-site morbidity was minimal. CONCLUSION: The blood supply of the ALT adipofascial flap is reliable. A considerable amount of the fatty layer of the flap can be removed primarily. It is a preferable procedure for reconstructing soft tissue defects.

Adipose Tissue↗
PubMed2002

[Surgical management of bilateral mandibular angle prominence associated with microgenia].

OBJECTIVE: A surgical procedure was developed to improve the operative results for bilateral mandibular prominence with microgenia. METHODS: Through an oral approach the bilateral prominent mandibular angles were resected using the technique of continuous curve-line ostectomy with the masseteric muscle intact. Meanwhile, the chin was elongated and moved forward by horizontal osteotomy. The distal part of the chin was rigid fixed with miniplates and screws, and the bone gaps were filled with autogenous bone of the resected mandibular angle. RESULTS: From November 1996 to August 1999, 20 cases of bilateral mandibular angle prominence with microgenia were corrected with this procedure. The postoperative appearance was improved greatly after 3-6 months. The lower face was not only narrowed but elongated, and consequently in harmony with the upper and middle face. CONCLUSION: Bilateral continuous curve-line mandibular angle ostectomy together with chin osteotomy and autogenous bone graft is a good procedure for the management of the above-mentioned deformities.

Adolescent↗
PubMed2002

[The surgical management of late complex posttraumatic enophthalmos].

OBJECTIVE: To study the surgical management of late complex posttraumatic enophthalmos. METHOD: According to the X-ray film and CT examination, the displaced orbital bone fragments was repositioned after osteotomy and rigid fixed by mini-plate and screws, then the orbital walls were repaired. RESULT: From July 1996 to June 2001, 42 cases were treated and the enophthalmos were obviously corrected or improved. CONCLUSION: The late complex posttraumatic enophthalmos can be corrected or obviously improved through reconstruction of the normal shape and volume by the reduction of displaced bone fragments and precise orbit wall repair.

Adolescent↗