The s tr ucture of a micromovement external fixture for treatment of diaphyseal long bo ne fracture is presented in this paper.Minisize DC geared motor and screw drive are used to transmit the power.Micro controller is used to control the micromove ment extent and frequency.This device can give the fractured bone ends micromo vement stress stimulation,so as to improve the forming and calcifying of the ca llus,and to accelerate the fracture healing process.This device can be applied t o the research on micromovement treatment of bone fracture.

Finite element method (FEM)is a calculating method for stress and strain analysis in the field of mechanical engineering.FEM has already been used in the design of medical apparatus,especially of the fixer for fracture treatment.The external fixer taken as an example,the anti-compression,anti-blending and anti-torsion characteristics of a certain type of external fixer are analyzed using FEM.This paper shows that by using FEM,the mechanical property of medical apparatus can be revealed at the designing stage.The strength and rigidity weak pocket can be found,and thus the improvement and optimization of medical apparatus can be made.

Objective To investigate the outcome between endoscopically assisted and routine anterior transposition of the ulnar nerve for treatment of cubital tunnel syndrome.Methods From Februray 2008 to June 2010, forty-four patients with cubital tunnel syndrome were treated with routine anterior subcutaneous transposition (routine group,28 cases) and endoscopically assisted anterior subcutaneous transposition (endoscope group,16 cases).The operate time,drug administration,scar and postoperative hospital stay were compared.The patients were followed 1-12 month postoperatively,postoperative time back to work and function of ulner nerve were recorded.Results The results of endoscope group were as follows: operative time was (67.20 ± 19.69)min; postoperative scar length was (1.5％ ± 0.58) cm; rate of administration of anodyne was 6.3％; postoperative hospital stay was (2.4％ ± 1.42) days; postoperative time back to work,(14.6 ± 4.69)days; the results of open surgery group were as follows:operative time (62.8％ ± 11.06) min; postoperative scar length was (8.7％ ± 1.42) cm; rate of administration of anodyne was 42.8％; postoperative hospital stay was (5.7％ ± 2.53) days; postoperative time back to work was (29.40 ± 8.75) days; all differences of the results were significant between two groups (P ＜ 0.05).According to function of ulner nerve scoring system,one year postoperatively, excellent or good results were 82.14％ in routine group and 81.25％ in endoscope group,no significant difference between two groups (P ＞ 0.05). Conclusion Compared with routine anterior transposition of the ulnar nerve,endoscopically assisted anterior transposition has the following advantages: smaller incision and less tissue damage,less postoperative pain and sooner returning to work.And similar outcome was achieved from the two group.

Based on the analysis of the workspace and positioning procedure for using the HIFU Surgery Platform, a simplified representation of the tumor volume's location and orientation in the workspace by Positioning Volume Ellipsoid is proposed. The terminal and intermediate configuration which the ultrasound focus must pass through during positioning is determined; according to the decided configurations, a C2 continuous uniform interpolating B spline positioning path is constructed in Lie Group SE (3); and a case analysis is made at last.
Equipment Design ; Humans ; Neoplasms ; surgery ; Robotics ; Surgery, Computer-Assisted ; instrumentation ; Surgical Equipment ; Ultrasonics

This paper demonstrates a 3D rotatory chair and the development of control rotatory system based on PLC, corresponding software and user interface. The PLC-based three-dimensional rotatory chair has the advantage of maneuverability and stability according to the result of the experiment.
Equipment Design ; Labyrinth Diseases ; rehabilitation ; Rehabilitation ; instrumentation ; Software ; User-Computer Interface