Pliability and deflection of diagnostic catheters

2014 ◽  
Vol 155 (39) ◽  
pp. 1544-1548
Author(s):  
Liza Pelyhe ◽  
Eszter Bognár
Keyword(s):  
Intravascular Catheter ◽  
Cardiac Catheter ◽  
Linear Dependency ◽  
Applied Method ◽  
Initial Diameter ◽  
Cardiac Catheters ◽  
Weak Points ◽  
Different Diameters

Introduction: The cardiac catheter is an intravascular catheter, which is introduced or implanted into the heart for diagnostic or therapeutic reasons. The catheters may break or king during their introduction and/or removal. Aim: The aim of the authors was to study the pliability of two catheters with the same material but different diameters according to the Food and Drug Administration’s recommendation. Method: The bending points, diameter decrease, deflection, and their correlation and dependence on the distance from the tip, as well as the influence of the initial diameter of the catheters were determined. The bending of catheters was performed on 9 bending points (120–280 mm from the tip by 20 mm) on 16 gauges with different radius (10–2.5 mm by 0.5 mm). Results: A linear dependency between the diameter decrease and deflection was observed, which was independent from the placement of the measurement in both catheters examined. The larger initial diameter had significant (p = 0.05) greater diameter decrease than the smaller, but the curves characteristic of the diameter decrease and deflection were similar. Conclusions: The applied method seems to be useful for the examination of weak points of cardiac catheters. Orv. Hetil., 2014, 155(39), 1544–1548.

scholarly journals In-Vivo Microsystems: A Review

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4953 ◽  
Author(s):  
Paddy French
Keyword(s):  
Medical Information ◽  
High Volume ◽  
The Body ◽  
Cardiac Catheter ◽  
Silicon Devices ◽  
Silicon Sensors ◽  
Cardiac Catheters ◽  
Single Sensor

In-vivo sensors yield valuable medical information by measuring directly on the living tissue of a patient. These devices can be surface or implant devices. Electrical activity in the body, from organs or muscles can be measured using surface electrodes. For short term internal devices, catheters are used. These include cardiac catheter (in blood vessels) and bladder catheters. Due to the size and shape of the catheters, silicon devices provided an excellent solution for sensors. Since many cardiac catheters are disposable, the high volume has led to lower prices of the silicon sensors. Many catheters use a single sensor, but silicon offers the opportunity to have multi sensors in a single catheter, while maintaining small size. The cardiac catheter is usually inserted for a maximum of 72 h. Some devices may be used for a short-to-medium period to monitor parameters after an operation or injury (1–4 weeks). Increasingly, sensing, and actuating, devices are being applied to longer term implants for monitoring a range of parameters for chronic conditions. Devices for longer term implantation presented additional challenges due to the harshness of the environment and the stricter regulations for biocompatibility and safety. This paper will examine the three main areas of application for in-vivo devices: surface devices and short/medium-term and long-term implants. The issues of biocompatibility and safety will be discussed.

Structural Organization and Distribution of Fiber Types in Extraocular Muscles of Cats

1972 ◽  
Vol 30 ◽  
pp. 34-35
Author(s):  
Asish C. Nag ◽  
Lee D. Peachey
Keyword(s):  
Fiber Type ◽  
Light And Electron Microscopy ◽  
Small Diameter ◽  
Extraocular Muscles ◽  
Fiber Types ◽  
Distinctive Features ◽  
Superior Rectus ◽  
Adult Cats ◽  
Different Diameters ◽  
Orbital Region

Cat extraocular muscles consist of two regions: orbital, and global. The orbital region contains predominantly small diameter fibers, while the global region contains a variety of fibers of different diameters. The differences in ultrastructural features among these muscle fibers indicate that the extraocular muscles of cats contain at least five structurally distinguishable types of fibers.Superior rectus muscles were studied by light and electron microscopy, mapping the distribution of each fiber type with its distinctive features. A mixture of 4% paraformaldehyde and 4% glutaraldehyde was perfused through the carotid arteries of anesthetized adult cats and applied locally to exposed superior rectus muscles during the perfusion.

Modified cardiac catheter for neonate and infant

JAMA ◽  
1966 ◽  
Vol 198 (11) ◽  
pp. 1222-1223
Author(s):  
J. Lynfield
Keyword(s):  
Cardiac Catheter

GAYA BICARA PADA STAF PENGAJAR JURUSAN AKUNTANSI POLITEKNIK NEGERI SEMARANG DI DALAM KEGIATAN PROSES BELAJAR MENGAJAR

2019 ◽  
Vol 2 (2) ◽  
pp. 165
Author(s):  
Pandiya Pandiya Pandiya ◽  
Nurul Hamida Hamida
Keyword(s):  
Data Analysis ◽  
Learning Process ◽  
Teaching And Learning ◽  
Sampling Technique ◽  
Body Language ◽  
Teaching Staff ◽  
Applied Method ◽  
Presentation Method ◽  
Study Support ◽  
Speaking Style

This study aims to determine the extent to which the teaching staff in the Semarang State Polytechnic Accounting Department applies a style of speech; i.e. either oratory, deliberative, consultative, relaxed, or intimate. The data collection is done by questionnaire and class observation. The population of this study consists of teaching staff at the Semarang State Polytechnic Accounting Department. The data is more qualitative, which is more in the form of a description of the characteristics of the respondents and not much related to the numbers. Sampling technique is done by population, namely all teaching staff of Semarang State Polytechnic Accounting Department. Data analysis is carried out by a Likert Scale of 5. The results indicate that Consultative Speech is the style most widely applied by the Teaching Staff of the Semarang State Polytechnic Accounting Department, while the oratoric speaking style is the least practiced style. Extemporan presentation method is the most widely applied method in the activities of the Teaching and Learning Process in the Semarang State Polytechnic Accounting Department, while the impromptu method is the least applied method. The most widely used body language is a smile, while eye flicker is the least applied body language. The distance between the Teaching Staff and Students in the Teaching and Learning Process activities that are most widely applied are groups (125-350 cm), while the least applied distance is intimate (50 cm). The results of this study support the previous research that the use of Body Language greatly affects the success of the Teaching and Learning process.

Daylight in Underground Spaces

2018 ◽  
pp. 156-161
Author(s):  
Alexei K. Solovyov
Keyword(s):  
Light Guide ◽  
Heat Losses ◽  
Internal Environment ◽  
Method Of Calculation ◽  
Natural Lighting ◽  
Different Depths ◽  
The Common ◽  
Different Diameters

Underground spaces in town centres present a big attraction for investors. However, they put special requirements to the internal environment. Those requirements can be fulfilled by means of daylighting. Examples of lighting of underground spaces are discussed. It is shown that the common systems of natural lighting are not always possible to use and cause big heat losses. Hollow light guide pipes allow avoid the shortcomings of common daylight systems. Method of calculation of daylight factors from hollow light guide pipes is shown. The results of calculation of daylight factors under the light guide pipes of different diameters in the different depths are presented.

FORMALIZED DESCRIPTION OF THE PROCEDURE OF INFORMATION SYSTEM RISK MANAGEMENT

2018 ◽  
pp. 61-70
Author(s):  
Svetlana Sergeevna Kozunova ◽  
Alla Grigorievna Kravets
Keyword(s):  
Information System ◽  
Risk Management ◽  
Negative Consequences ◽  
Management Procedure ◽  
System Risk ◽  
Weak Points ◽  
Formalized Description ◽  
Relationship Of ◽  
The Relationship ◽  
Further Development

The article highlights the aspects of risk management in the information system. According to the analysis of the work of Russian and foreign scientists and world practices in the field of risk management, it is stated that there is a need to improve the effectiveness of risk management of information system and to develop a method for managing the risks of the information system. As a solution to the problem of effective risk management of the information system, there has been proposed a formalized procedure for managing the risks of the information system. The scientific novelty of this solution is the use of decision space and optimization space to reduce risks. This procedure allows to assess the damage, risk and effectiveness of risk management of the information system. The risks of the information system are determined and analyzed; a pyramidal risk diagram is developed. This diagram allows you to describe the relationship of risks with the components of the information system. The negative consequences to which these risks can lead are given. The analysis of methods and approaches to risk management has been carried out. Based on the results of the analysis, the methods GRAMM, CORAS, GOST R ISO / IEC scored to the maximum. The weak points of these methods and the difficulty of applying these methods in practice are described. The developed formalized risk management procedure to control the risks of information system can be used as management system’s element of the information security quality that complies with the recommendations of GOST R ISO / IEC 27003-2012. The prospect of further development of the research results is the development of management systems of risk of information system.

The Axis Feature: Illusionary Effects on Children's Judgments of Length

1982 ◽  
Vol 55 (3) ◽  
pp. 720-722
Author(s):  
Anat Scher
Keyword(s):  
Relative Length ◽  
The Other ◽  
Context Model ◽  
Structural Pattern ◽  
Perceptual Judgments ◽  
Length Estimation ◽  
Different Diameters

The effect of the position of lines on length estimation was investigated. 40 5-yr.-olds were asked to compare the two arms of an L-shaped figure presented inside circular frames of different diameters. For each figure one of the arms was on the axis, that is, the diameter, and the other arm was perpendicular to that axis. In making perceptual judgments about the relative length of two lines the children tended to describe the on-axis line as longer than the off-axis line. This illusion which, presumably, reflects a perceptual force induced by the characteristics of the structural pattern, supports the context model of visual anomalies.

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