Koszorúérsztentek oldalágelérési lehetőségének előrejelzése

Bifurkációs léziók esetén szükség lehet a fő és mellék érágba is sztentet implantálni. Ezt az orvosok különböző technikákkal teszik meg, viszont mindegyik a sztent egyik középső cellájának tágításán alapul. Jelen munka a sztentek funkcionális tulajdonságai közül az oldalágelérés vizsgálatával és előrejelzésének lehetőségeivel foglalkozik. Az eredmények birtokában megadható, hogy egy adott sztent alkalmas-e oldalági tágításra és amennyiben igen, mekkora az elérhető maximális cellaátmérő

FLEXIBILITY TEST OF THE TOOLS OF ANGIOPLASTY

Coronary angioplasty is a procedure used to treat the narrowed coronary arteries. Physicians operate with many different tools during the intervention, the main devices are the following: guidewires, guiding catheters, balloon catheters and stents. One of the most important properties of the tools of angioplasty is flexibility. This article introduces a flexibility measuring device and a testing method. With the help of this the flexibility of the tools of angioplasty can be compared easily

INVESTIGATION OF THE SIDE BRANCH ACCESS WITH SIMPLE VESSEL MODEL DURING BIFURCATION STENTING

Endovascular stents such as coronary stents can be used for the treatment of atherosclerosis. If the narrowing involves a main vessel and a side branch as well, physicians have to use bifurcation stenting technique. Bifurcation lesions constitute nearly 15 % of all percutaneous coronary interventions (PCI), so the investigation of bifurcation stenting methods is very important. This article introduces a simple method to measure side branch access and related functional stent properties in the case of stent-balloon technique. With this method we can tell if bifurcation stenting is possible or not, and if so the size of the available access

Investigation of metallic surface area of coronary stents

OBJECTIVES: Endovascular stents, such as coronary stents, are widely used for the treatment of narrowed or blocked blood vessels caused by plaque formation in the arteries. The narrowing of expanded blood vessels (restenosis) is perhaps the major complication associated with endovascular stent implantation that is believed to be caused by insufficient metallic surface area (MSA) in some stent designs. Our aim was to compare three examination methods which were developed at our department, to measure stent surface areas. METHODS: The first method was manually performed using rotating equipment under a stereomicroscope. The second method, which has recently been developed, is an automated method using an integrated scanner and a rotating engine. Both methods aimed at converting the cylindrical stent into a flattened two-dimensional image in order to enable the measurement of stent surface area by imaging software. The third method is based on a calculation which uses various stent values such as diameter, length, and strut thickness. Each measurement process was tested on different types of stents. RESULTS: Our findings showed that the methods gave similar results. The largest differences between the methods were speed and accuracy. CONCLUSIONS: The results lead us to propose favouring the automated rotation method

Mechanical and Microstructural Features of Ceramic Hollow Spheres

In this study two different types of hollow sphere were examined by mechanical, geometrical and microstructural measurements, and the fracture force, geometrical properties and chemical composition were determined. The diameter of the „01 globocer” type specimens was 2.37 mm on average, while the value for the „03 globocer” type specimens was 6.88 mm, both were smaller than the nominal diameter. The average deviation from the circularity of the 01 globocer specimens was 8 %, the value for the 03 globocer specimens was 6 %, while the average wall porosity was 53±3 % and 56±3 % respectively. The surface of the hollow spheres was uneven, which has an impact on the contact surfaces during pressure tests, which affects the fracture force values. The average value of the fracture force of 01 globocer spheres was 42 N, and of 03 globocer hollow spheres was 288 N. The diameter had a bigger impact on the fracture force values of the type 01 specimens than in the case of 03

Patológiás sztentek vizsgálata

Számos európai országhoz hasonlóan Magyarországon is a halálesetek jelentős hányadának hátterében szív- és érrendszeri megbetegedések állnak. Az érszűkületek hatékony kezelési módja az angioplasztika. A beavatkozás során egy ballont az érrendszeren keresztül juttatnak el a szűkület helyéig, ahol azt feltágítják. A ballonnal együtt egy ún. sztentet is feltágítanak, amely a ballon leeresztése után a szervezetben marad. Ez az eszköz biztosítja a beavatkozás után a vér szabad áramlását az adott érszakaszban egészen a páciens élete végéig. Jelenleg kevés irodalmi adat áll rendelkezésünkre a szervezet által okozott, a sztenteken végbement változásokról. Emiatt kutatásunk, amely explantált koszorúérsztentek vizsgálatával foglalkozik, előrelépés lehet ezen a területen. Célunk a patológiás sztentek roncsolásmentes károsodásvizsgálata volt; a sztenteken látható károsodások okainak feltárása és a műszaki állapotukban bekövetkezett változások mérése