Objective: To study the feasibility and effects of disc resection in patients with extremely-lateral disc herrniation (ELDH) with microendoscopic tubular retractor (METRx) through intertransversal route. Methods: In t...Objective: To study the feasibility and effects of disc resection in patients with extremely-lateral disc herrniation (ELDH) with microendoscopic tubular retractor (METRx) through intertransversal route. Methods: In the period from March 2000 to December 2002, 9 patients with ELDH underwent disc resection with METRx system through intratransversal route and the clinical outcome was evaluated with Nakai standard. Results: The operation time ranged from 60 to 120 min with an average of 75 min; the blood loss ranged from 50 to 120 ml with an average of 60 ml; and the hospitalization time ranged from 5 to 19 d with an average of 13 d. No wound infection, neurological damages, pseudomeningocele or other complications occurred. The rate of excellent and good outcome was 88.9%. Conclusion: Disc removal in patients with ELDH can be done with METRx system and satisfactory results are obtained.展开更多
A unilateral self-locking mechanism(USM) was proposed to increase the tractive ability of the inchworm in-pipe robots for pipeline inspection.The USM was basically composed of a cam,a torsional spring and an axis.The ...A unilateral self-locking mechanism(USM) was proposed to increase the tractive ability of the inchworm in-pipe robots for pipeline inspection.The USM was basically composed of a cam,a torsional spring and an axis.The self-locking and virtual work principles were applied to studying the basic self-locking condition of the USM.In order to make the cooperation between the crutch and telescopic mechanism more harmonical,the unlocking time of the USM was calculated.A set of parameters were selected to build a virtual model and fabricate a prototype.Both the simulation and performance experiments were carried out in a pipe with a nominal inside diameter of 160 mm.The results show that USM enables the robot to move quickly in one way,and in the other way it helps the robot get self-locking with the pipe wall.The traction of the inchworm robot can rise to 1.2 kN,beyond the limitation of friction of 0.497 kN.展开更多
OBJECTIVE: To study the potential and advantages of internal distraction osteogenesis in mandibular functional reconstruction. METHODS: Three types of mandibular distractors were used in eight patients with various ma...OBJECTIVE: To study the potential and advantages of internal distraction osteogenesis in mandibular functional reconstruction. METHODS: Three types of mandibular distractors were used in eight patients with various mandibular defects due to tumor or cyst resection. The average age of the patients was 31.5 years old (ages ranged from 8 to 54 years). For two patients with ramus defects, specially designed distractors were used to restore the normal ramus height. In two other patients, specially designed trifocal distractors were used. In three patients, vertical distractors were used. RESULTS: All the mandibles were successfully reconstructed in accordance with the direction and distance designed before operation except in one patient. In that patient the distal 23 mm defect failed to be corrected because of loosening of transport block fixation screws. CONCLUSIONS: Mandibular defects can be successfully corrected using internal distraction osteogenesis. Performing mandibular reconstruction using distraction osteogenesis is best done at the time of tumor or cyst resection.展开更多
Purpose： To describe an indirect reduction technique during minimally invasive percutaneous plate osteosynthesis （MIPPO） of tibial shaft fractures with the use of a distraction support. Methods： Between March 2011...Purpose： To describe an indirect reduction technique during minimally invasive percutaneous plate osteosynthesis （MIPPO） of tibial shaft fractures with the use of a distraction support. Methods： Between March 2011 and October 2014, 52 patients with a mean age of 48 years （16-72 years） sustaining tibial shaft fractures were included. All the patients underwent MIPPO for the fractures using a distraction support prior to insertion of the plate. Fracture angular deformity was assessed by goniometer measurement on preoperative and postoperative images. Results： Preoperative radiographs revealed a mean of 7.6°（1.2°-28°） angulation in coronal plane and a mean of 6.8°（0.5°-19°） angulation in sagittal plane. Postoperative anteroposterior and lateral radio graphs showed a mean of 0.8°（0°-4.0°） and 0.6°00-3.6°） of varusvalgus and apex anterior/posterior angulation, respectively. No intraoperative or postoperative complications were noted. Conclusions： This study suggests that the distraction support during MIPPO of tibial shaft fractures is an effective and safe method with no associated complications.展开更多
文摘Objective: To study the feasibility and effects of disc resection in patients with extremely-lateral disc herrniation (ELDH) with microendoscopic tubular retractor (METRx) through intertransversal route. Methods: In the period from March 2000 to December 2002, 9 patients with ELDH underwent disc resection with METRx system through intratransversal route and the clinical outcome was evaluated with Nakai standard. Results: The operation time ranged from 60 to 120 min with an average of 75 min; the blood loss ranged from 50 to 120 ml with an average of 60 ml; and the hospitalization time ranged from 5 to 19 d with an average of 13 d. No wound infection, neurological damages, pseudomeningocele or other complications occurred. The rate of excellent and good outcome was 88.9%. Conclusion: Disc removal in patients with ELDH can be done with METRx system and satisfactory results are obtained.
基金Project(2007AA04Z256) supported by the National High-Tech Research and Development Program of China
文摘A unilateral self-locking mechanism(USM) was proposed to increase the tractive ability of the inchworm in-pipe robots for pipeline inspection.The USM was basically composed of a cam,a torsional spring and an axis.The self-locking and virtual work principles were applied to studying the basic self-locking condition of the USM.In order to make the cooperation between the crutch and telescopic mechanism more harmonical,the unlocking time of the USM was calculated.A set of parameters were selected to build a virtual model and fabricate a prototype.Both the simulation and performance experiments were carried out in a pipe with a nominal inside diameter of 160 mm.The results show that USM enables the robot to move quickly in one way,and in the other way it helps the robot get self-locking with the pipe wall.The traction of the inchworm robot can rise to 1.2 kN,beyond the limitation of friction of 0.497 kN.
文摘OBJECTIVE: To study the potential and advantages of internal distraction osteogenesis in mandibular functional reconstruction. METHODS: Three types of mandibular distractors were used in eight patients with various mandibular defects due to tumor or cyst resection. The average age of the patients was 31.5 years old (ages ranged from 8 to 54 years). For two patients with ramus defects, specially designed distractors were used to restore the normal ramus height. In two other patients, specially designed trifocal distractors were used. In three patients, vertical distractors were used. RESULTS: All the mandibles were successfully reconstructed in accordance with the direction and distance designed before operation except in one patient. In that patient the distal 23 mm defect failed to be corrected because of loosening of transport block fixation screws. CONCLUSIONS: Mandibular defects can be successfully corrected using internal distraction osteogenesis. Performing mandibular reconstruction using distraction osteogenesis is best done at the time of tumor or cyst resection.
文摘Purpose： To describe an indirect reduction technique during minimally invasive percutaneous plate osteosynthesis （MIPPO） of tibial shaft fractures with the use of a distraction support. Methods： Between March 2011 and October 2014, 52 patients with a mean age of 48 years （16-72 years） sustaining tibial shaft fractures were included. All the patients underwent MIPPO for the fractures using a distraction support prior to insertion of the plate. Fracture angular deformity was assessed by goniometer measurement on preoperative and postoperative images. Results： Preoperative radiographs revealed a mean of 7.6°（1.2°-28°） angulation in coronal plane and a mean of 6.8°（0.5°-19°） angulation in sagittal plane. Postoperative anteroposterior and lateral radio graphs showed a mean of 0.8°（0°-4.0°） and 0.6°00-3.6°） of varusvalgus and apex anterior/posterior angulation, respectively. No intraoperative or postoperative complications were noted. Conclusions： This study suggests that the distraction support during MIPPO of tibial shaft fractures is an effective and safe method with no associated complications.
