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Wyszukujesz frazę "Uklejewski, R." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Elasto-electric longitudin harmonic waves in porous long bones filled with physiological fluid
    Podłużne harmoniczne fale sprężysto-elektryczne w porowatych kościach długich wypełnionych płynem fizjologicznym
    Autorzy:
    Uklejewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/281332.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    cortical bone
    Biot's poroelasticity
    electrokinetics
    elasto-electric waves
    Opis:
    Transmission of elasto-electric longitudinal harmonic waves in porous long bones filled with physiological fluid is investigated. The complete set of equations of the problem is obtained on the basic of the Biot theory of elastic waves in fluid-saturated porous media and the linear equations of electrokinetics, by means of quantities analogous to those in the theory of electrical transmission lines. Experimental findings from the biomechanical literature, supporting applicability of the proposed description, are presented. The electric signal associated with the propagation of longitudinal elastic waves in a wet long bone shaft can potientially be used for monitoring these waves during their application in e.g. bone porosity measurements.
    Przedmiotem pracy jest zagadnienie transmisji sprężysto-elektrycznych podłużnych fal harmonicznych w porowatych kościach długich wypełnionych płynem fizjologicznym. Zbiorczy układ równań zagadnienia wyprowadzono na podstawie Biotowskiej teorii propagacji fal sprężystych w ośrodkach porowatych nasyconych cieczą oraz liniowych liniowych równań elektrokinetyki, stosując opis za pomocą wielkości analogicznych do stosowanych w teorii elektrycznych linii przesyłowych. Uzasadniono przydatność zaproponowanego modelu teoretycznego przywołując z literatury wyniki badań eksperymentalnych dotyczące bioelektromechaniki kości. Sygnał elektryczny towarzyszący propagacji podłużnych fal sprężystych w trzonie kości długiej nasyconej płynem fizjologicznym mógłby, przypuszczalnie, zostać użyty celem monitorowania tych fal w zastosowaniu ich np. do pomiaru porowatości kości.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 1998, 3; 819-838
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technological issues of additive manufacturing of preprototypes of the multispiked connecting scaffold for non-cemented resurfacing arthroplasty endoprostheses
    Autorzy:
    Uklejewski, R.
    Winiecki, M.
    Rogala, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/286161.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    arthroplasty
    endoprostheses
    biomaterials
    Źródło:
    Engineering of Biomaterials; 2014, 17, no. 128-129; 81-82
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer aided stereometric evaluation of porostructural-osteoconductive properties of intra-osseous implant porous coatings
    Autorzy:
    Uklejewski, R.
    Winiecki, M.
    Rogala, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220521.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface topography
    porous coating characterization
    poroaccessibility
    3D measurement
    Opis:
    The proper interaction of bone tissue - the natural porous biomaterial - with a porous coated intra-osseous implant is conditioned, among others, by the implant porous coating poroaccessibility for bone tissue adaptive ingrowth. The poroaccessibility is the ability of implant porous coating outer layer to accommodate the ingrowing bone tissue filling in its pore space and effective new formed bone mineralizing in the pores to form a biomechanically functional bone-implant fixation. The functional features of the microtopography of intra-osseous implant porous surfaces together with the porosity of pore space of the outer layer of the porous coating are called by bioengineers the porostructural-osteoconductive properties of the porous coated implant. The properties are crucial for successful adaptive bone tissue ingrowth and further long-term (secondary) biomechanical stability of the boneimplant interface. The poroaccessibility of intra-osseous implants porous coating outer layers is characterized by - the introduced in our previous papers - set of stereometric parameters of poroaccessibility: the effective volumetric porosity φVef, the index of the porous coating space capacity VPM, the representative surface porosity φSrep, the representative pore size pSrep, the representative angle of the poroaccessibility Ωrep and the bone-implant interface adhesive surface enlargement index ψ. Presented in this paper, an original method of evaluation of the porostructural-osteoconductive properties of intra-osseous implant porous coatings outer layer by means of the parameters of poroaccessibility was preliminary verified during experimental tests performed on the representative examples of porous coated femoral stems and acetabular cups of various hip endoprostheses. The computer-aided stereometric evaluation of the microstructure of implant porous coatings outer layer can be now realized by the authoring application software PoroAccess_1.0 elaborated in our research team in Java programming language.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 3; 431-442
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer aided evaluation of poroaccessibility of porous coatings outer layer on intra-osseous implants
    Autorzy:
    Uklejewski, R.
    Winiecki, M.
    Radomski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/285924.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    porous coatings
    implants
    biomaterials
    Opis:
    The poroaccessibility of intra-osseous implant coating is the ability of the porous coating outer layer to accommodate the ingrowing bone tissue filling its pore space and effective new bone formation mineralizing in the pores to form biomechanically functional bone - implant fixation. The poroaccessibility determines the functional features of intra-osseous implant porous coating which are called its structural-osteoinductive properties [6, 8]. The structural-osteoinductive properties can be characterized by the set of three-dimensional parameters of poroaccessibility describing the functional properties of microgeometry of implant porous coatings: the effective volumetric porosity φ Vef , the index of the porous coating space capacity VPM, the representative surface porosity φ Srep, the representative pores size pSrep, the representative angle of the poroaccessibility Ωrep and the bone-implant interface adhesive surface enlargement index ψ [3,7,1]. The original method of stereometric evaluation of the microstructural properties of intra-osseous implants porous coatings by means of the parameters of poroaccessibility [4] is based the 3D roughness profilometry and was preliminary verified during experimental tests performed on the representative examples of porous coated femoral stems and acetabular cups of various hip endoprostheses [2,5,9]. In this paper we present the possibilities of computer aiding for evaluation of the poroaccessibility of porous coating outer layer of intra-osseous implants illustrated by the measurement data from the experimental tests performed on porous coated components of various hip endoprostheses. The computer aided evaluation of the microstructure of implant porous coatings can be realized b y t he authoring application software PoroAccess_1. 0 elaborated for our purposes in our research team in Java programming language. The screen of the application software is presented in FIG. 1. The PoroAccess_1.0 software lets to perform the dynamic analysis of the surface porosity φS in function of the pores depth pd which is showed as the map of porosity situated on the right side of the screen (see FIG. 1). The application software imports results from the series of contact profilometry measurements as the 2D matrices in ASC II format and calculates the values of the poroaccessibility parameters of porous coating outer layer according to the mathematical formulas given in [3,11]. The applications software also has the module enabling 3D visualization of measured region of porous coating outer layer as the isometric plot. The presented methodology provides the characterization of the effective part of porous coating – its outer layer, which is full of pores open for penetrating bone tissue with the diameter of many macro pores surpassing 100 μm. Such size of pores, according to clinical research [1], is beneficial for bone tissue to grow into the coating, so the pore space of the porous coating outer layer participates in creating biomechanically functional bone-porous implant fixation. The set of poroaccessibility parameters characterizes some major aspects of porous coating outer layer features. The parameters describe spatial (φVef, φSrep), volumetric (VPM), hybrid (pdef, ΩMMrep) and some functional (physicochemical) properties of implant porous coatings outer layer, e.g. enhancement of the adhesive properties (ψ), which can be indirectly interpreted in the aspect of its structural-osteoinductive properties [10]. The presented methodology of characterization of implant porous coatings with use of the poroaccessibility parameters is going to be applied as a specific tool in research on designing porous coatings with functionally graded pore distribution and designed poroaccessibility. Nowadays, the best potential to manufacture implant porous coatings with designed poroaccessibility have Direct Metal Manufacturing (DMM) technologies like Selective Laser Sintering / Melting (SLS/M) or Electron Beam Melting (EBM), so the next stage of this research is the investigation on the possibilities to manufacture the porous coating with designed poroaccessibility in one of DMM technologies. The biostructural evaluation of the manufactured in DMM technologies porous coatings together with its biological evaluation in NHOst cultures is expected to provide more information about the representative features of the microstructure of the porous coatings and allow to evaluate the most advantageous poroaccessibility of their pore spaces for potential bone tissue ingrowth to be verified in further in vivo test on animal models.
    Źródło:
    Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 42-43
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype of innovating bone tissue preserving THRA endoprosthesis with multi-spiked connecting scaffold manufactured in selective laser melting technology
    Autorzy:
    Uklejewski, R.
    Rogala, P.
    Winiecki, M.
    Mielniczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/284792.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    tkanka kostna
    endoproteza THRA
    SLM
    bone tissue
    THRA endoprosthesis
    selective laser melting
    Opis:
    The paper presents the prototype of innovating bone tissue preserving THRA endoprosthesis with multi-spiked connecting scaffold - the main result of our research project: "Experimental investigation and design of the constructional properties of bone-porous implants fixations" (4T07C05629, Polish Ministry of Science, finished in February 2008) presented also as plenary lecture at the 18th International Conference "Biomaterials in Medicine and Veterinary Medicine" in Rytro (Poland), 2008. Three-dimensional selective laser melting (SLM), a direct metal manufacturing (DMM) technology from rapid prototyping/rapid manufacturing (PR/RM) group, was successfully applied to manufacture these prototypes of Ti6AI7Nb powder. We share our observations and remarks on the prototypes manufacturing in SLM laser additive technology.
    Źródło:
    Engineering of Biomaterials; 2009, 12, 87; 2-6
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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