Search PubMed⌕ Search

Biomedical subjects

D Popa

Publications and source records attributed to D Popa.

At least 19 recordsLinked to original sources
PubMed2006

CAD method for three-dimensional model of the tibia bone and study of stresses using the finite element method.

In the real life, the leg and its skeleton are exposed at the most diverse stresses. It is known that the human bone is one of the most important natural composite materials. The paper presents a method of study and the steps to obtain the virtual bones of the human body, method applied to tibia bone. For that purpose was used a CAD parametric software which permits to define models with a high level of complexity. To obtain the bone cross sections of the tibia bone a Computer Tomograph was used. The obtained 3D model is studied using the finite element method, taking into consideration the real structure of the bone and the mechanical characteristics of cortical and spongy, and we can obtain the stresses distribution for different solicitation.

Biomechanical Phenomena↗
PubMed2005

Analysis of stress and displacements of phalanx bone with the finite element method.

In this paper analyze of phalanx bone supposed at compression, torsion and bending is made. We know that the bones are one of the most important natural composite materials. The finite element method offers the possibility for the study of the stress and the displacements which appears in different solicitations cases. We realized that the most solicited parts of the bone which will be the next broken parts, so the fracture are the once from the meeting of the bone's body with its hand. The observations made by studying 74 cases of fractures caused by torsion and compression and also made by the testing of 23 phalanx bones confirm these conclusions.

Finger Phalanges↗
PubMed2005

The generation of the three-dimensional model of the human knee joint.

In this paper we analyze the anatomic elements that compose the human knee joint. Also, we build the spatial model of the human knee joint components. This study is necessary for the design of prosthesis elements and for the establishment of the necessary prosthesis technique.

Femur↗
PubMed2001

[Physiopathology in accommodation and presbyopia, clinical and surgical approach].

Accommodation is a complex of phenomena by which the refracting power of the eye changes for focusing on near vision. Accommodative amplitude declines progressively with increasing age. Until today, this phenomenon called presbyopia was explained by Helmholtz's hypothezis which involves only ciliary muscle. It seems that in accommodation are involved, besides the ciliary muscle, the lens and extraventicular elastic components, biophysical dynamics of the lens capsule, vitreous, iris. According with the role of these factors and theirs pathophysiological implications, new surgical technique has developed to reverse presbyopia in the human eye (Surgical reversal presbyopia, Anterior ciliary sclerotomy) and offers a potential for understanding ocular hypertension and treatment of primary open-angle glaucoma.

Accommodation, Ocular↗