Abstract. Distance clothing technology is an actively developing area. For its implementation in the highly specialized area of manufacturing technical means of rehabilitation, and, in particular, in the manufacture of special functional and aesthetic clothing for disabled people, it is necessary to solve organizational and technical issues. An example of a technical issue is remote acquisition of dimensional features. The dimensional characteristics of the human body are an integral part of the technological process of manufacturing individual clothing. The use of 3D scanning makes it possible to implement remote technology for individual design and manufacture of clothing. The production of clothing for wheelchair users involves the adaptation of standard clothing design techniques to the specific properties of the posture. A case of a patient with a C5-C6 cervical vertebra fracture who has been using a wheelchair for more than 25 years is considered. The study used 3D human models obtained with a 3D scanner. The technique of scanning and an example of processing the obtained data are presented. The main features of dimensional features have been determined and an algorithm for their determination by anatomical landmarks has been developed. Recommendations are given for processing 3D scans and combining them into one 3D model. It is shown that the use of 3D scanning for the remote production of a set of functional and aesthetic clothing for a wheelchair user is a way to produce comfortable individual clothing.
Introduction. The principles of construction of the knee joint in the transfemoral prosthesis are considered. The design of the knee joint in the transfemoral prosthesis with an original mechanism for ensuring buckling resistance in the prosthesis is proposed.Goal. Create an artificial knee joint, which provides a reliable mechanism of strut stability during walking by quickly blocking the flexion-extension of the artificial knee joint in the prosthetics for high amputations of the lower extremities when resting on the prosthesis.Materials and methods. One of the main problems that exist in the development of knee joints in a femoral prosthesis is the presence in the design of the module of a mechanism that ensures its blocking from bending when walking at the moment of support of the prosthesis in the transfer phase of a healthy limb. In the knee joints of various companies, this issue is solved in different ways. For example, some simple singleaxis knee joints are designed to lock when the disabled person is in a standing position. Walking is carried out without flexion in the knee joint. To unlock, pull the cable (transition to a sitting position). In some single-axis hinges, a locking function is applied using the weight of a disabled person. In the phase of support on a full foot, the hinge closes due to the weight load on it and opens by transferring weight to the toe. In more complex multi-axis module designs, there is a so-called geometric lock. The closure in the stance phase occurs due to the correct arrangement of the axes relative to each other. The opening occurs in the transfer phase.The object of the study. The mechanisms of the knee joint, which provide a handicapped person's resistance to buckling while walking on a transfemoral prosthesis.The subject of the study. The design of the knee joint, which provides self-braking due to a coupling with a split disc.Results. The study made it possible to substantiate the practical possibility of creating a knee joint of prosthetics for high amputation with a braking device made in the form of a split disc clutch.Discussion. Currently, there are various designs of knee joint that have mechanisms of buckling. When considering modern knee joint of well-known manufacturers, the main ways of ensuring buckling resistance are determined. The polycentric knee module of the company "Össur" implements the principle of knee locking due to the displacement of the instantaneous axis when the knee is extended, thereby providing buckling resistance. In the Ottobock knee joint, the knee axis is automatically closed under the influence of human weight. Domestic manufacturers of knee modules are ORTHOS (Novosibirsk) and Metiz. Also, the scientific and production corporation "Precision Instrument Engineering Systems" (NPC SPP, part of Roscosmos) announced the production of the knee module "Aktiv-2". Due to the restriction of imports of foreign products, state prosthetic and orthopedic enterprises are interested in the development and production of domestic prosthetic and orthopedic products, including artificial knee joints of various designs.Conclusions. The principles of constructing the design of the knee joint of the above knee prosthesis have been formed.
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