Papers by Keyword: Orthosis

Abstract: In this study, a sensor system was designed and manufactured to measure the interface pressure between the limbs and the orthosis or between the stump and the socket prosthesis. It is also used to determine the value and location of corrective forces when using orthosis to correct deformities in the limbs or spine. The sensor system consists of a force sensor mat (43.69 x 43.69 mm), Arduino, LCD monitor, and connecting cables. When comparing the device manufactured in this study with other devices, this device is characterized as lightweight, easy to move, low cost and gives instant pressure on the LCD screen. In this study, the interventional pressure measurement system was manufactured and programmed and compared to the F-Socket measurement system. The practical part was tested on a patient suffering from med-lateral instability in the ankle joint at the right leg. The interventional pressure between the leg and orthosis was measured in two ways at the regions (posterior, lateral, medial) .the first method using the pressure measurement system manufactured in this study and the second method by using the F-Socket device. The test results showed that the values ​​of pressure readings using the manufactured system are close to the values ​​of pressure readings obtained when using the F-Socket device. This indicates that the accuracy of the readings of the manufactured system and can be used for research purposes as well as in the process of placing pads in the appropriate place within the orthosis to correct the deformity or help to provide valuable information on the manufacturing, modification and fitting of prosthetic sockets. despite its simple structure and low cost as compared with F-Socket devise.

Abstract: It is known that the deformities that affect the lower limbs are multiple in terms of location and severity of the injury. These deformities are treated with the use of orthosis, which varies depending on the type of deformity and the area of ​​injury. The principle on which the orthosis depends on the treatment of deformities is applying three-point pressures. These pressures are applied during the manufacturing process of the orthosis but with the time when the deformation response to treatment by corrected forces these mean the value and location of these corrective forces will change and this requires the manufacturing of a new orthosis. This requires costs in money and time to re-correct these forces. In this study, a force correction system was suggested that could change the value and location of corrective forces without need to manufacture a new orthosis and within a few minutes by placing an air chamber on the side of the orthosis. When increasing or withdrawing the amount of air inside the air chamber, the magnitudes of corrected force change according to the required value, this process providing comfort to the patient and reducing the effort of the professional staff supervisor (orthotist) to correct the deformity. The result showed that a method of correction forces applied by using the air chamber to correct deformities was successful when applied to a patient with varus foot deformity where the pressure generated from the air chamber on the leg was measured by using the F-Socket devise at the lateral side recorded a higher interface pressure (140Kpa) than the others sides due to pump the air to push the ankle joint for correction deformity without needing to manufacture of a new orthosis to change the values of correction forces thus reducing the cost and time to treat deformity, also the result showed improvement of the gait cycle, the value of ground reaction force on the body and footprint of the patient when comparing the results before and after the use of the orthosis by the patient.

Abstract: This work involved two major parts: the first Part is the experimental part included manufacturing ankle foot orthotics, measure the (the reaction force of the ground, pressure distribution) for both normal (healthy) and sound side (intake) legs in two case, the first measurement when the patient walking without orthosis while the second test when the patient dressed up the flexible (AFO). The pressure generated between leg and calf part is measured by F-Socket devise. The experimental part also consist test the mechanical properties of a suggestion composite material. The second Part is the (FEM) finite element analysis for numerical simulation part during which the stresses are calculated using ANSYS 14.5 software. Experimental work was done on a case study suffering from low level spinal cord trauma he has good control of the trunk muscles but the muscle weakness and nerve damage for right leg. The patient with age, weight of 30years, 75kg, respectively. The Results show the parameters of test for both legs (left and right) in two cases. The results show that the data of the gait cycle in the case of the patient wearing the brace is more acceptable and we notice improvement in the performance of walking steps and reduce the difference between the infected leg and natural and this indicates the good evaluation of this orthosis. Max pressure obtained is 1.53*10^5MPa from F .Socket at calf region .Max stress Calculated at Posterior ankle joint because it is flexible Position The equivalent Von-Mises stress and the safety factor for fatigue of the composite material gave good results this led to the longer life design.

Abstract: This paper is aimed at developing the system assisting an orthotics specialist during correction process of orthoses structure. Orthotics is a specialty within medical field increasingly progressing in terms of variety of offered services, equipment and materials used. Further mentioned in this paper is the usage of optical scanning, depending on making series of photos in split second and then assembling then into 3D model, thus eliminating drawbacks of the classical methods based on the plaster cast preparation. The objective of such computer aided design is evaluation of the influence of prostheses shape modifications on their features.

Abstract: Prolonged standing at work has been linked to health problems including foot, leg and back pain, varicose veins, circulatory problems, including a possible increased stroke risk. [1]. There are many other potentially very serious health concerns. Worsening of existing coronary heart disease as well as varicose veins and chronic venous insufficiency has been associated with prolonged standing. Pain in the lower limbs and feet are also associated. [2] Studies suggest back pain associated with long surgery is about twice as common in those who stand compared to those medical staff who usually work sitting, even after controlling for age and lifting weights. The main reason is the back position must to be inclinate in the most part of the surgery. The design of orthesis for the lower extremity with chest support represents an alternative to medical staff health problems who standing for long periods on surgical procedure. The surgical orthesis system proposal in this research is positioned on middle side of the leg and is designed such that support the body weight during the surgical procedure. The system can be used for release pressure on ankle, knee and hip joints.

Abstract: Most stroke patients who have lost the ability to use their fingers do not recover the functions of the fingers in their activity of daily living (ADL). This paper presents a novel approach in finger rehabilitation for acute paralysed stroke survivors. Based on repetitive exercise concept, the device is designed to provide support for fingers to do flexion and extension movements according to the patients range of motion. A conceptual design of the device is proposed after considering the current mechanism and control from similar current devices published and commercialised. A comparison between 4 existing main working mechanisms: (1) Pneumatic Cylinders, (2) Artificial Rubber Muscles, (3) Linkage Mechanism, (4) Cable-Driven Mechanism is also provided in this paper. The key for designing the device is home-based practice, easy to use and affordable. Further investigation and experiments on the proposed: Cable Actuated Finger Exoskeleton (CAFEx) are currently still in progress.