The Interventional Pressure (IP) between the orthosis and the foot in this study was measured using an engineered sensor device. When using orthotic devices to correct deviation of the foot or limb, it is often used to assess the importance and position of corrective forces. The components of the sensor device are: a 43.5 x 43.5 mm force sensor mat, an LCD display, connecting wires, and an Arduino. The system developed in this study is described as lightweight, easy to move, and inexpensive compared to other devices. This study made and programmed a sensor to measure pressure between the orthosis and the foot in three areas, and compared it to the F-Socket sensor. The experimental test was performed on a patient who suffered from instability of the right leg at the ankle joint. In the posterior, lateral and medial regions, the interventional pressure between the tibia and the orthosis was calculated in two ways. The 1st method uses the sensor manufactured in this study (SCR), while the 2nd method uses the F-Socket sensor. The test results showed that the pressure readings obtained from the fabricated device were close to the results obtained using the F-Socket device.

Keywords: orthosis, arduino, force-sensitive resistor, interventional pressure.

This study presents two different designs of the ankle-foot orthosis (AFO): the adjustable hinged and the modified static, polypropylene and steel models. The ankle-foot orthosis test is performed in a patient with an ankle fracture as a result of a sports injury. Analysis of AFO models for calculating von Mises stress and fatigue safety margin is demonstrated. Interference, force, and pressure between the AFO contact area and the foot were measured for all subjects using the F-Socket probe, which was used to measure force applied to the ankle joint, for numerical analysis using ANSYS V.R15. Where we can see that the ankle joint has the greatest concentration of load. The stresses and margin of safety in the AFO adjustable joint are 418.9 MPa and 2.4, respectively. Whereas in the modified static AFO the stress and safety margin reached 192.8 MPa and 0.447, respectively.

Keywords: force, pressure, ankle joint, mobile joint, modified statics, ankle-foot orthosis

In order for a person with an amputated limb to regain motor activity, should be created fitting lower limb prosthesis and able to movement. The goal of this research is to improve a passive prosthesis depending on microcontroller-unit, transfemoral prosthesis that can reach to the desired of rotational speed for functional use while remaining low-cost. The improvement of this design focuses on creating a new knee joint mechanism using a DC motor pre-existing, the foot, and the socket can get from the previous model. This entails simulating normal limb function while also enhancing the knee prosthesis range motion. the specific requirements that must be realize in this design, such as the knee joint new model ability to flex up to 90 degrees and be strong enough to support the weight of the amputee's body.

Keywords: knee joint, prosthetics, Solid works, ANSYS software, aluminum 6061-T6, stainless Steel 4130

The study examines the manufacturing process of two types of ankle-foot orthoses (AFO): an adjustable joint and a modified static joint. Polypropylene and steel are used in manufacturing. Vacuum forming is used in the manufacturing process. The ankle orthosis test is performed on a patient with an ankle fracture as a result of a sports injury. The treadmill and F-Socket are used in the second step of the study for gait analysis. In addition, walking cycle results including: ground reaction force (GRF), center of pressure, pressure distribution, stride length, and footprint analysis were used to demonstrate a significant difference between healthy subjects and subjects with pathology who wore AFO. Interference, force, and pressure between feet with AFO contact areas were measured for all subjects.

Keywords: orthosis, ankle-foot orthosis, prosthetics, lower extremities, manufacturing procedure, subject with pathology, subject without pathology

A method, a device and an experimental model were developed to control the cooling and providing effective low temperatures during cryosurgical treatment of bone tumors. Using the developed device, a range of effective temperatures was determined under the action of liquid nitrogen on the model of the bone cavity. Two ways of cooling the residual bone cavity, instillation and contact, were compared. During the experiment it was proved that the contact method of cryoexposure on the residual bone cavity model is more effective than the instillation of liquid nitrogen according to the characteristics of the temperature field. The proposed experimental model of the residual bone cavity makes it possible to study the temperature field, determine the rate of freezing and thawing both with the contact method and with the instillation of liquid nitrogen into the bone cavity. The results obtained allow to develop preliminary recommendations on the technique of carrying out cryosurgical ablation of bone tumors.

Keywords: cryoprobe, experimental model, tumors of bones, cryosurgery

In order to improve minimally invasive technique knee arthroplasty the authors developed a device for carrying minimally invasive arthroplasty allowing without patellar dislocation, align total knee replacement through proper channel formation in epimetaphysis thigh where installed Cutting Guide, with the block for trimming the articular surface of the femur. Using the device improves the accuracy of implantation of the prosthesis.

Keywords: invasive knee replacement, gonarthrosis, medical instruments

In order to improve minimally invasive technique knee arthroplasty authors propose "retractor to retract the patella in minimally invasive total knee arthroplasty," which can improve visualization during surgery to protect the extensor apparatus of the knee joint and reduce the number of complications and "Apparatus for carrying a minimally invasive knee arthroplasty" to improve the accuracy of the endoprosthesis implantation through access «quadriceps-sparing».

Keywords: invasive knee replacement, gonarthrosis, medical instruments

In order to improve techniques of minimally invasive total knee arthroplasty (IEAC) based on anatomical studies, we have developed a mathematical model and a computer program IEAC preoperative planning that takes into account the anthropometric data of the patient (body type, size patellar index Insall-Salvati), type and size of prosthesis and allows to calculate minimal incision and maximum elongation wound during surgery. Use of this software improves the accuracy of the planning and preparation of surgery, to improve the accuracy of implantation of the prosthesis.

Keywords: minimally invasive replacement of knee joint, computer modelling, preoperative planning, computer software preoperative planning