Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : bio

Bio and Mechanical Evaluation of an Enhanced Bio Glass

J.T. Al-Haidary; M.N. Arbilei; J.S. Kashan

Engineering and Technology Journal, 2018, Volume 36, Issue 1, Pages 65-69

These Tap casting and powder metallurgy methods used to produce the 45S5 Bioglass. This study revealed that the bioglass modified with 0.2% Y2O3 has about 700% increases in hardness. The modification of bioglass with 0.2% Y2O3 leads to a 44% increase in fracture toughness values. This study revealed that the 0.2% Y2O3 bioglass composition-modification improves the fracture strength by almost 150%. The laboratory histological sections showed that 45S5 bioglass (original composition materials showed nether systemic nor local inflammation with new bone formation at site of implantation. The Y2O3 modified the 45S5 bioglass showed no inflammation reactions as well, but no new bone formation and regeneration was noticed in the adjacent bone tissue.

Design and Analysis of Printed Square Loop Antenna and Solenoidal Loop Antenna for Pill Shaped Bio-implants Object

S. Mutashar

Engineering and Technology Journal, 2017, Volume 35, Issue 1, Pages 9-15

This paper deals to design and investigated two proposed loop antenna for pill shaped bio-implants objects such as wireless capsule endoscopy. In additional it’s help in developing an understanding of how the fields decay with distance. The first proposed loop antenna is the planar printed square loop antenna with outer dimensions 9 mm and inner dimension 0.45 mm, 6 turns, width 0.5 mm and 0.25 mm of space which can be easily integrated with a system-on-chip technology. The second proposed loop antenna is the solenoidal loop antenna where the solenoid had 9 turns, a pitch of 1 mm and a radius of 5 mm and can be easily wound in the form of a coil and encased within the pill shaped object. For both antennas the electromagnetic field was solved at 1MHz. From the radiation patterns results it can be observe that the surrounding pattern gain around the antennas is constant and conform the omnidirectional pattern associated to such loop antennas that fit the capsule endoscopy randomly movement within the human body in different directions. The design simulations and results are performed and validated by using commercial High Frequency Structure HFSS software.

Pulse Laser Parameters Effect on Tissue Thermal Damage Zone in Coagulation Process

Khalid Salem Shibib; Ayad Zwayen Mohammed; Kholood Hasan Salih

Engineering and Technology Journal, 2011, Volume 29, Issue 5, Pages 972-985

Owed to wide use of pulsed lasers in a medical field, a deep understanding of
their effects on the temperature increase in tissue and the subsequent tissue thermal
damage in a coagulation process may be a matter of importance. The influence of
laser beam profile, repetition rate and pulse width on temperature distribution and the
subsequent thermal damage in tissue are studied using finite element method, which
solves the axis-symmetry bio-heat equation in tissue subjected to far IR pulse laser
irradiation. Some conclusions are obtained: as energy/pulse remains constant,
Gaussian laser beam profile rather than a top-hat beam will increase the in-depth
tissue thermal damage at and near the center of the spot region, increasing in
repetition rate will increase the temperature distribution and subsequent damage zone.
As pulse width decrease, high temperature may be reached leading to cause a
quantitatively and qualitatively damage which can be recognize as an increase in the
size of the damage zone and a higher value of thermal dose. An increase in pulse
width will reduce the rate at which energy deposed in the tissue which result in low
extent of temperature increase which result in reduction of the damage zone
quantitatively and qualitatively.