Tricuspid Ring Valve Abscess in an AICD implanted patient

10.5580/1adc ◽  
2007 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Ring Valve

scholarly journals Biomechanical-Structural Correlation of Chordae tendineae in Animal Models: A Pilot Study

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1678
Author(s):  
Justyn Gach ◽  
Izabela Janus ◽  
Agnieszka Mackiewicz ◽  
Tomasz Klekiel ◽  
Agnieszka Noszczyk-Nowak
Keyword(s):  
Mitral Valve ◽  
Complex Structure ◽  
Future Research ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Histopathological Analysis ◽  
Papillary Muscles ◽  
Chordae Tendineae ◽  
Structural Correlation ◽  
Ring Valve

The mitral valve apparatus is a complex structure consisting of the mitral ring, valve leaflets, papillary muscles and chordae tendineae (CT). The latter are mainly responsible for the mechanical functions of the valve. Our study included investigations of the biomechanical and structural properties of CT collected from canine and porcine hearts, as there are no studies about these properties of canine CT. We performed a static uniaxial tensile test on CT samples and a histopathological analysis in order to examine their microstructure. The results were analyzed to clarify whether the changes in mechanical persistence of chordae tendineae are combined with the alterations in their structure. This study offers clinical insight for future research, allowing for an understanding of the process of chordae tendineae rupture that happens during degenerative mitral valve disease—the most common heart disease in dogs.

scholarly journals DIESEL INJECTOR PUMP WITH RING CONTROL VALVE

2020 ◽  
pp. 68-76
Author(s):  
Fanil' Gabdrafikov ◽  
Irshat Aysuvakov ◽  
Ilgiz Galiev
Keyword(s):  
Fuel Injection ◽  
Ring Width ◽  
Control Valve ◽  
Free Edge ◽  
Original Position ◽  
Design Parameters ◽  
Elastic Ring ◽  
Hydraulic Actuator ◽  
Wide Range ◽  
Ring Valve

The studies were carried out with the aim of modernizing the pump injector with a hydraulic actuator of the HEUI system plunger with the development of a control valve model based on a split elastic ring that provides fast fuel injection control. The upgraded device differs from the existing ones in that instead of a control freely floating valve (ball) or a poppet valve with springs, a valve in the form of a split elastic ring is installed in the valve assembly. One end of this ring is fixed rigidly, the other is freely movable to block the drain channel of the liquid. The canal overlaps the free edge of the ring when the electromagnet is turned on (installed with a gap inside the ring), and also (in the absence or malfunction of the electromagnet) from the valve itself running under the pressure of the supplied fluid. When upgrading the pump injector by the proposed method and using an annular control valve with electronic control (with optimal ring parameters), a new technical effect is achieved - reducing the response time of the control valve. This is due to the fact that the free edge of the split elastic ring, like a mechanical multiplier, blocks the drain canal π times faster than the valve stroke when it rises from the pressure of the fluid flow or signal when the electromagnet is on. The ring valve simultaneously acts as a spring to return to its original position, simplifying the design as much as possible. In the course of research, a new mathematical expression was derived for calculating the valve stroke depending on its design parameters. Using this formula, the optimal parameters of the control ring valve of the pump injector were established, which affect the quality of fuel injection in a wide range of diesel operation: diameter - 20 mm, ring width - 12 mm, thickness - 0.46 mm, diameter of the control fluid supply canal - 3 mm.

scholarly journals Theoretical and experimental study of a hydraulically actuated diesel pump-injector unit with electronically controlled ring valve

2019 ◽  
Vol 47 (3) ◽  
pp. 576-584
Author(s):  
Fanil Gabdrafikov ◽  
Marsel Abrarov ◽  
Sergey Shamukaiev ◽  
Irshat Aysuvakov ◽  
Denis Kharisov ◽  
...  
Keyword(s):  
Experimental Study ◽  
Hydraulically Actuated ◽  
Ring Valve

Increasing the impact fatigue strength of ring valve plates

1976 ◽  
Vol 12 (12) ◽  
pp. 1114-1115 ◽  
Author(s):  
V. A. Pyshkin ◽  
V. A. Yakovlev ◽  
V. Yu. Kuznetsov ◽  
S. A. Abramenko
Keyword(s):  
Fatigue Strength ◽  
Impact Fatigue ◽  
Ring Valve ◽  
The Impact

Analysis of Failure of Compressor Multi-Ring Valve Plates

1979 ◽  
Vol 193 (1) ◽  
pp. 53-59
Author(s):  
R. M. Weir
Keyword(s):  
Static Pressure ◽  
Radial Crack ◽  
Vibration Modes ◽  
Foreign Matter ◽  
Element Analysis ◽  
Impact Forces ◽  
Plate Design ◽  
Ring Valve ◽  
Valve Operation ◽  
Laser Holography

Correctly operated compressor multi-ring valves are known to fail essentially by radial crack growth. The existing explanations of static pressure (with or without impact forces) or foreign matter entrapment are found to be inconsistent with the crack alignment and site respectively. The hypothesis is made that diametral vibration modes are responsible, since they relate to the crack alignment. Wear examination reveals that these modes occur during valve operation and that a four diameter mode is common. Laser holography and a crude finite element analysis depict diametral modeshapes which match the wear patterns. Crack and stress details give further support to the hypothesis. A more rigid plate design is suggested.

scholarly journals DIESEL INJECTOR PUMP WITH RING CONTROL VALVE

2020 ◽  
Vol 15 (1) ◽  
pp. 68-75
Author(s):  
Fanil' Gabdrafikov ◽  
Irshat Aysuvakov ◽  
Ilgiz Galiev
Keyword(s):  
Fuel Injection ◽  
Ring Width ◽  
Control Valve ◽  
Free Edge ◽  
Original Position ◽  
Design Parameters ◽  
Elastic Ring ◽  
Hydraulic Actuator ◽  
Wide Range ◽  
Ring Valve

The studies were carried out with the aim of modernizing the pump injector with a hydraulic actuator of the HEUI system plunger with the development of a control valve model based on a split elastic ring that provides fast fuel injection control. The upgraded device differs from the existing ones in that instead of a control freely floating valve (ball) or a poppet valve with springs, a valve in the form of a split elastic ring is installed in the valve assembly. One end of this ring is fixed rigidly, the other is freely movable to block the drain channel of the liquid. The canal overlaps the free edge of the ring when the electromagnet is turned on (installed with a gap inside the ring), and also (in the absence or malfunction of the electromagnet) from the valve itself running under the pressure of the supplied fluid. When upgrading the pump injector by the proposed method and using an annular control valve with electronic control (with optimal ring parameters), a new technical effect is achieved - reducing the response time of the control valve. This is due to the fact that the free edge of the split elastic ring, like a mechanical multiplier, blocks the drain canal π times faster than the valve stroke when it rises from the pressure of the fluid flow or signal when the electromagnet is on. The ring valve simultaneously acts as a spring to return to its original position, simplifying the design as much as possible. In the course of research, a new mathematical expression was derived for calculating the valve stroke depending on its design parameters. Using this formula, the optimal parameters of the control ring valve of the pump injector were established, which affect the quality of fuel injection in a wide range of diesel operation: diameter - 20 mm, ring width - 12 mm, thickness - 0.46 mm, diameter of the control fluid supply canal - 3 mm.

scholarly journals Transcatheter methods of treatment of mitral valve pathology: current state of the problem

2020 ◽  
pp. 19-23
Author(s):  
Т.Э. Имаев ◽  
А.Е. Комлев ◽  
И.В. Кучин ◽  
Р.С. Акчурин
Keyword(s):  
Mitral Valve ◽  
Treatment Strategies ◽  
Support Ring ◽  
Advantages And Disadvantages ◽  
Current State ◽  
Comparative Advantages ◽  
Ring Valve ◽  
Valve In Valve ◽  
Valve Pathology ◽  
Methods Of Treatment

Во второй части обзора, посвященного транскатетерным методам лечения патологии митрального клапана (МК), рассматриваются вопросы транскатетерного протезирования МК (TMVI), в том числе: имплантация протеза в кальцинированное нативное фиброзное кольцо (valve-in-MAC), в ранее установленные хирургический биопротез (valve-in-valve) и опорное кольцо МК (valve-in-ring). Также кратко обсуждаются сравнительные преимущества и недостатки двух стратегий хирургического лечения - протезирования и пластической реконструкции – в контексте транскатетерной хирургии МК. Issues of transcatheter mitral valve (MV) implantation (TMVI) including implantation of a prosthesis into calcified native fibrous ring (valve-in- MAC), into previously implanted surgical bioprosthesis (valve-in-valve) and MV support ring (valve-in-ring) are considered in the second part of the review devoted to transcatheter methods of treatment of MV pathology. The comparative advantages and disadvantages of two surgical treatment strategies — prosthetics and plastic reconstruction — are also briefly discussed in the context of MV transcatheter surgery.

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