Wyniki wyszukiwania - BazTech

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On engineering verifications of external and internal fixators for traumatology and orthopaedics

Frydrysek K., Ucen O., Fojtik F., Poruba Z., Theisz G., Sejda F., Michenkova S.

Modelowanie Inżynierskie

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2014

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T. 21, nr 52

42--50

EN

In this article the authors draw attention to the possibilities of treatment for complicated bone fractures. They present their own design, laboratory tests and numerical solutions (i.e. strength analyses and reliability assessments) of the various types of internal and external fixators applied in traumatology and orthopaedics (i.e. intended for fractures of limbs, pelvis and calcaneus). The new design of external fixators is based on the development of Ilizarov and other techniques (i.e. shape and weight optimization based on composite materials, application of smart materials, nanotechnology, low x-ray absorption, antibacterial protection, patient comfort, reduction in the duration of surgical treatment, and cost). Similarly, the new intramedullary nail C-NAIL (i.e. an example of an internal fixator) is intended for minimal-invasive fixation of intra articular calcaneal fractures.

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Distribution of radiological density in bone regenerate in relation to cyclic displacements of bone fragments

Filipiak J., Krawczyk A., Morasiewicz L.

Acta of Bioengineering and Biomechanics

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2009

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Vol. 11, nr 3

3-9

EN

We asked how bone fragment displacement could influence the distribution of radiological density in bone regenerate formed during the process of bone lengthening. The metatarsi of 21 sheep were lengthened by 20 mm by the Ilizarov method. The bone fragments were externally fixed with a specially designed ring external fixator equipped with linear actuator driver system. The test sheep were divided into three experimental groups: the G1 and G2 groups (N = 8) and the GR group (N = 5) - the reference group. In the case of sheep from the G1 and G2 groups, the lengthening was supplemented with mechanical stimulation of the regenerate in the form of cyclic bone fragment displacements (CBFDs) with the amplitudes of 1 mm (G1) and 2 mm (G1). Mechanical stimulation was applied over 30 days for 1 h per day with a frequency of 1 Hz. Eight weeks after the procedure the sheep were sacrificed in accordance with the required procedures. The analysis of the degree of bone regenerate mineralization involved the studies based on the CT scanning. The analysis of the results obtained is based on the paramenter called the degree of regenerate mineralization (RMD). The analysis of radiological density was carried out in the selected measurement areas. Such an area was located in three horizontal zones, taking into account the regenerate height, i.e. in its middle part (half regenerate length); the top part, 2 mm from the edge of the proximal fragment; and the bottom part, 2 mm from the edge of the distal fragment. The value of the RMD parameter varies significantly, depending on the bone regenerate area. The results obtained show that the CBFD = 2 mm accelerates the rate of mineralization of an eight-week-old regenerate. In the case of CBFD = 1 mm, the mineralization rate is lower by more than a dozen per cent.

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Concept of bone fracture healing measure used load measuring in external fixators

Jasińska-Choromańska D.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

149-154

EN

The measurement of osteogenesis gives the possibility to more precise diagnostics of the fractures, and can be also applied to the computer techniques like e.g. artificial intelligence. The treatment of long bone fractures by external fixators affords an unique opportunity to control the healing of the fracture by measuring the tension on the frame, that occurs under the load given to the bone and rely on the mechanical properties of the fracture. The paper presents some information about one of the diagnosis method using to the bone fracture healing.

4

Simulation in Active Dynamisation Systems Design

Kołodziej D., Jasińska-Choromańska D.

Machine Dynamics Problems

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2006

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Vol. 30, No. 3

155-162

EN

Human needs are forming in a most incredible ways. People expectation to keep ability of the active life manner are changing according to techniques development that caused increasing quality in the other domains of human life. Nowadays the situation are changing from day to day in and is especially hard for the engineers. Computers techniques gives lots of tools that have to help to fulfil various expectation of the society. It force the medical engineering to create new quality of the devices that have to be ahead the present days demands.

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Applying the Forced Vibration in the External Fixator-Bone System

Kołodziej D.

Machine Dynamics Problems

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2004

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Vol. 28, No. 3

163-169

EN

Appearing stimulus in the region of fracture increasing an activity of bone cells has beneficial influence for our health and mood. Wide known fact is stimulating the cells in due time and in due place. It can extract energy to rebuilt the old bone structure or to create the suitable environment for different kinds processes running in the live organism's bodies. Also the known fact is the lack of external impulses to going the degradation of an organ.

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Experimental analysis of external fixators for femoral bone elongation

Będziński R., Filipiak J.

Acta of Bioengineering and Biomechanics

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1999

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Vol. 1, nr 2

91-105

EN

The purposes of this study were to analyse the stability of the system formed by the Ilizarov fixator and the thigh being elongated. The research was conducted under laboratory (tests on physical models) and clinical (tests on real objects) conditions during the process of the elongation of the femur bone. The aim of the laboratory investigation was to determine the displacement of the bone fragments as a function of the external load and construction of the fixator. The aim of the clinical study on real objects was to determine the state of the load acting on the particular supported rods of the fixator and its changes during elongation of the lower limb in the thigh section. The investigations have demonstrated that the stability of system: the Ilizarov fixator-the thigh being elongated is a function of the mechanical properties of the adapted fixator structure and the forces acting on this system. Optimal spatial configuration of the fixator must be selected for the particular course of treatment.