Wyniki wyszukiwania - BazTech

1

Wpływ procesów starzenia na wytrzymałość mechaniczną cementu kostnego

Szarek A.

Aktualne Problemy Biomechaniki

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2010

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z. 4

191--194

PL

Wytrzymałość mechaniczna poszczególnych elementów sztucznych stawów ma zasadnicze znaczenie na ich żywotność w organizmie. Ze względu na złożony stan naprężeń oraz agresywne środowisko wewnątrz organizmu człowieka powoduje, że wraz z upływem czasu zmieniają się właściwości wytrzymałościowe poszczególnych elementów endoprotez. Ponieważ wpływ starzenia na spadek wytrzymałości PMMA stosowanego do mocowania protezy w kości, może spowodować obluzowanie się protezy w kości, w artykule przedstawiono wyniki badań pozwalających na określenie wielkości tych zmian w okresie pierwszych 6 lat po polimeryzacji.

EN

Mechanical strength in each part of artificial joints is of essential importance to their life in the body. A complex distribution of stress combined with aggressive environment inside human body causes that strength properties in the part of endoprostheses change in the course of time. Since the effect of aging on the decline of strength in PMMA used for fixation of the prosthesis in bone might cause that the prosthesis comes loose in the bone, this paper presents the results of the investigations which allow for determination of the extent of these changes in the period of first 6 years after polymerization.

2

Guidance Note: Risk Management of Workers With Medical Electronic Devices and Metallic Implants in Electromagnetic Fields

Hocking B., Mild K. M.

International Journal of Occupational Safety and Ergonomics

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2008

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Vol. 14, No. 2

217--222

EN

Medical electronic devices and metallic implants are found in an increasing number of workers. Industrial applications requiring intense electromagnetic fields (EMF) are growing and the potential risk of injurious interactions arising from EMF affecting devices or implants needs to be managed. Potential interactions include electromagnetic interference, displacement, and electrostimulation or heating of adjacent tissue, depending on the device or implant and the frequency of the fields. A guidance note, which uses a risk management framework, has been developed to give generic advice in (a) risk identification—implementing procedures to identify workers with implants and to characterise EMF exposure within a workplace; (b) risk assessment—integrating the characteristics of devices, the anatomical localisation of implants, occupational hygiene data, and application of basic physics principles; and (c) risk control—advising the worker and employer regarding safety and any necessary changes to work practices, while observing privacy.

3

Numerical modeling of selected joints of human body

John A., Orantek P.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

173-178

EN

The advanced models require high fidelity of geometry and boundary conditions. In the paper the numerical models of pelvic bone and scapula are prepared on the ground of the geometrical data from 3D scanning and CT. The accuracy of geometrical model depends on number of scanning levels. A numerical routine (numerical code) was built to translate the geometrical data (the set of coordinate points) to the Patran/Nastran code. The way of optimal modeling is found. Next, the results of surgical intervention and reconstruction of damaged joints can be taking into account, too.

4

Numerical analysis of selected joints of human body

John A., Orantek P.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 26

167-172

EN

The numerical modeling makes it possible to prepare FE model of human joints before and after reconstruction. It is particular important when the total arthroplasty operation is performed and the artificial joint is fitted. Here, the results for scapula before arthroplasty and for pelvic bone after THA are presented. For checking the influence of the forces acting in acetabulum on the stress and strain distribution in the surroundings of the artificial acetabulum a simple bench-mark was proposed, with force acting on acetabulum by steel ball.