Atria assist device to restore transport function of fibrillating atrium☆

Tozzi, Piergiorgio; Hayoz, Daniel; Thévenaz, Pierrick; Roulet, Jean-Yves; Salchli, Francois; Segesser, Ludwig K. von

doi:10.1016/j.ejcts.2007.09.042

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…This process can be repeated indefinitely without damage. Some existing implantable devices using nitinol have already confirmed the biocompatibility of the system . In our study we used a given current to heat the wire up to 70 °C which is its transitional temperature.…”

Section: Methodsmentioning

confidence: 93%

Experimental evaluation of an electromechanical artificial urinary sphincter in an animal model

et al. 2013

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What's known on the subject? and What does the study add?• The AMS 800 urinary control system is the gold standard for the treatment of urinary incontinence due to sphincter insufficiency. Despite excellent functional outcome and latest technological improvements, the revision rate remains significant.• To overcome the shortcomings of the current device, we developed a modern electromechanical artificial urinary sphincter. The results demonstrated that this new sphincter is effective and well tolerated up to 3 months. This preliminary study represents a first step in the clinical application of novel technologies and an alternative compression mechanism to the urethra. Objectives• To evaluate the effectiveness in continence achievement of a new electromechanical artificial urinary sphincter (emAUS) in an animal model. • To assess urethral response and animal general response to short-term and mid-term activation of the emAUS.

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Section: Methodsmentioning

confidence: 93%

Experimental evaluation of an electromechanical artificial urinary sphincter in an animal model

et al. 2013

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“…In the field of atrial fibrillation, the device already is a reality, proving that actually generates atrial output for ventricular fibrillation, and can even be used to support two biatrial assistant devices. The auxiliary device improves the right atrial ejection fraction in 7% during rapid stimulation, simulating an atrial contraction [16].…”

Section: Discussionmentioning

confidence: 99%

Pulsatile stent graft: a new alternative in chronic ventricular assistance

Palma¹,

Gaia²,

Caputi³

et al. 2013

Revista Brasileira De Cirurgia Cardiovascular

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217Rev Bras Cir Cardiovasc | Braz J Cardiovasc SurgRev Bras Cir Cardiovasc 2013;28(2):217- Abstract Objective: Heart failure is currently one of the most common hospitalization causes. Several chronic circulatory assist devices have been tested and are highly complex. The objective is the description of a pulsatile endoprosthesis capable of applying a chronic pulse within the descending aorta, similar to that produced by intra-aortic balloon.Methods: Pulsatile stents composed of nickel-titanium were built and positioned to engage latex tubes simulating the aorta. Different electric currents were applied to units connected in series in order to cause structure contraction and displacement of a liquid column. There were two sequence tests: first composed of two metallic cages and the second composed of five cages. At first sequence tests was applied a voltage of 16.3 volts and a current of 5 amperes. In the second, voltage of 15 volts and current of 07 amperes.Results: In the first sequence was obtained the pulsatile effect of stent, with contraction of the tube and displacement of the water column sufficient to validate the pulsating effect of the endoprosthesis. The two structures ejected a volume of 2.6 ml per cycle, with a range of 29 mm in height of the column of water equivalent to 8% shrinkage during the pulse. In the second sequence, it reachead a variation of 7.4 mL per cycle. Conclusion:The results obtained confirm the stent pulsatile contractility activated by electrical current. The continuity of the study and material improvement are necessary to obtain more efficient model from the point of view of energy and pulse, to allow ejection volumes comparable with the intra-aortic balloons.Descriptors: Heart failure. Aorta. Stents. ResumoObjetivo: A insuficiência cardíaca é uma das causas mais comuns de internação. Dispositivos para assistência circulatória crônica foram testados e, em sua maioria, são de alta complexidade. O objetivo deste estudo é a descrição de uma endoprótese contrátil com capacidade de pulsação crônica no interior da aorta descendente, de maneira semelhante à produzida pelo balão intra-aórtico.Métodos: Endopróteses pulsáteis compostas de níquel-titânio foram posicionadas de forma a envolver tubos de látex, simulando a aorta. Diferentes correntes elétricas foram aplicadas a unidades ligadas em série, de modo a causar contração da estrutura e deslocamento de uma coluna líquida. Foram realizadas duas sequências de testes: a primeira com ORIGINAL ARTICLE 218Rev Bras Cir Cardiovasc | Braz J Cardiovasc Surg Bras Cir Cardiovasc 2013;28(2):217-23 Palma JH, et al. -Stent aórtico pulsátil: uma nova alternativa na assistência ventricular crônica duas gaiolas metálicas e a segunda com cinco gaiolas. Na primeira sequência de testes, aplicou-se tensão de 16,3 volts e corrente de 5 amperes e, na segunda sequência, tensão de 15 volts e corrente de 7 amperes. RevResultados: Na primeira sequência de testes, obtevese o efeito pulsátil dos 2 stents, havendo contração do tubo e deslocamento da coluna d'á...

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“…Similar to natural muscles, the nitinol fibres reduce their length when electrically stimulated; hence, the concept of motorless motion or artificial muscles. This concept, the technical characteristics of the device and the preliminary in vitro results have been extensively described in our previous publications [8,9].…”

Section: Description Of the Atrial Assist Devicementioning

confidence: 99%