Wyniki wyszukiwania - BazTech

1

Wear of working part of surgical drills

Gwoździk M.

Czasopismo Techniczne. Mechanika

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2016

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Y. 113, iss. 3-M

99--104

EN

The paper presents the results ofstudies onthe topography of surgical borers flank after their operation. The studies were carried out on borers made of X39Cr13 martensitic steel, which was subject to heat and surface (plasma nitriding) treatment. Test drilling was performed in beef bones, which were fixed in a vice to ensure appropriate stability, a borer 6 mm in diameter and 160 mm long was used. The studies on the topography of flank comprised studies on roughness, which were carried out by means of a profilographometer designed for 2D and 3D studies on the surface by means of a contact method. The studies were carried out for borers of flank formed by successive drilling cycles.

PL

W artykule przedstawiono wyniki badań topografii powierzchni przyłożenia wierteł chirurgicznych po eksploatacji. Badania przeprowadzono na wiertłach ze stali martenzytycznej X39Cr13, które poddano obróbce cieplnej oraz powierzchniowej (azotowanie jarzeniowe). Testowe wiercenia wykonywano w kościach wołowych, które mocowano w imadle, w celu zachowania odpowiedniej stabilności, użyto wierteł o średnicy 6 mm i długości 160 mm. W ramach badań topografii powierzchni przyłożenia przeprowadzono badania chropowatości, które realizowano z zastosowaniem profilografometru przeznaczonego do badań 2D i 3D powierzchni metodą stykową. Badania przeprowadzono dla wierteł o powierzchni przyłożenia ukształtowanej poprzez kolejne cykle wiercenia.

2

Influence of surgical drills wear on thermal process generated in bones

Basiaga M., Paszenda Z., Szewczenko J., Kaczmarek M.

Acta of Bioengineering and Biomechanics

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2013

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Vol. 15, no. 4

19--23

EN

The influence of the wear rate of drills used in bone surgery on the temperature distribution in the femur models (Sawbones) is presented in the paper. Surgical drills of diameter d = 4.5 mm and diverse edge geometry (90° and 120°) were selected for the study. In order to carry out thermal analysis with the use of finite element, experimental studies of wear process were necessary. These studies, among others, consisted in determination of average values of axial forces and cutting torques as a function of the number of drilled holes. The study showed an impact of the drill geometry on values that describe cutting process. It was found that the greatest values of torques and axial cutting forces occur in drills of point angle of 120°. Next, in order to determine the effect of wear rate on the generation of temperature in the cutting zone, thermal analysis of the drilling process using the finite element method was carried out. It was found that higher temperatures in the bone are observed for drilling with the use of the drill of point angle equal to 120°, as in the experimental study. For the tools of such edge geometry the wear of cutting edge is more intensive and the generated temperature in femur for the wear land VBB = 0.32 mm has reached the critical value associated with the process of thermal necrosis.

3

Obróbka cieplna i cieplno-chemiczna wierteł Chirurgicznych

Frączek T., Olejnik M.

Inżynieria Powierzchni

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2011

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nr 4

34-38

PL

W pracy dokonano oceny wpływu azotowania jarzeniowego na właściwości warstwy wierzchniej stali austenitycznej gatunku 316L wg AISI (X2CrNiMo17-12-2 wg PN-EN 10088-1:1998). Ze stali tej wykonano wiertła chirurgiczne. Proces azotowania jarzeniowego przeprowadzono w urządzeniu do azotowania typu JON-600 w temperaturze T=733 K (460°C) i czasie t = 64,8 ks (18 h), przy czterech różnych wariantach rozmieszczenia próbek w komorze jarzeniowej. Próbki przeznaczone do azotowania zostały umieszczone na katodzie, na podłożu odizolowanym zarówno od katody jak i anody, czyli w tzw. "potencjale plazmy" oraz dodatkowo próbki umieszczone na katodzie, jak i w potencjale plazmy zostały osłonięte ekranem wspomagającym. W celu oceny efektywności wariantów procesu azotowania przeprowadzono badania twardości powierzchniowej, rentgenowskiej analizy fazowej, analizę struktur warstw wierzchnich oraz odporności na zużycie przez tarcie.

EN

The AISI 316L (PN-EN 10088-1:1998 X2CrNiMo17-12-2) grade austenitic steel after glow discharge nitriding at temperature of T = 733 K (460°C) and for duration of t = 64,8 ks (18 h), for different variants of specimen placement in the glow-discharge chamber in the JON-600 device has been investigated. Surgical drills were made from this steel. The location of the samples in the working chamber was as follows: on the cathode, on the ceramic insulator (in the plasma potential mode), on the cathode with assisting shield and on the ceramic insulator with assisting shield. In order to assess the effectiveness of nitriding process variants hardness tests, x-ray diffraction, the analysis of surface layer structures and wear resistance test have been carried out.

4

Numerical and experimental analyses of drills used in osteosynthesis

Basiaga M., Paszenda Z., Szewczenko J., Kaczmarek M.

Acta of Bioengineering and Biomechanics

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2011

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Vol. 13, no. 4

29-36

EN

This paper presents the results of numerical analysis and experimental studies of the process of bone drilling using drills applied in osteosynthesis procedures. In the studies, two surgical drills with a diameter d = 4.5 mm and varying in drill point geometry 2k were used. Thermal analysis based on FEM allowed determining the distribution of temperatures generated in the bone as a function of rotational speed of the drill. The results indicate that both drill point geometry and rotational speed of the drill have influence on temperatures generated in bone tissue. Additionally, the range was determined for possible values of rotational speed, which does not initiate the process of thermal necrosis of bone. The experimental studies of the process of drilling in a femur model showed the impact of drill point geometry on the values describing the cutting process. It was concluded that the highest values of torques and axial forces during cutting occur in the tools with angle 2k2 = 120 (degrees).

5

Analiza wytrzymałościowa wierteł chirurgicznych z wykorzystaniem metody elementów skończonych

Basiaga M., Paszenda Z.

Engineering of Biomaterials

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2009

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Vol. 12, no. 89-91

93--97