Investigation of parameter estimator and adaptive controller for assist pump by computer simulation.

abstract：:This work presents results of preliminary studies concerning application of magnetic bearing in a ventricular assist device (VAD) being developed by Dante Pazzanese Institute of Cardiology-IDPC (São Paulo, Brazil). The VAD-IDPC has a novel architecture that distinguishes from other known VADs. In this, the rotor has a...

journal_title：Artificial organs

authors： Horikawa O,de Andrade AJ,da Silva I,Bock EG

更新日期：2008-04-01 00:00:00

abstract：BACKGROUND:The use of ventricular assist devices (VAD) as a bridge to heart transplant (HT) is increasing, while HT volume remains stagnant. This may portend longer waiting times and an otherwise more competitive environment for all patients on the HT waiting list. METHODS:A retrospective analysis of patients who were...

journal_title：Artificial organs

authors： Han JJ,Elzayn H,Duda MM,Iyengar A,Acker AM,Patrick WL,Helmers M,Birati EY,Atluri P

更新日期：2020-10-01 00:00:00

abstract：:A surgical method for the implantation of a mechanical right ventricular assist device which avoids resternotomy/thoracotomy and related complications at the time of explantation is presented. In order to support the failing right heart, a Dacron vascular graft was sewn to the pulmonary artery. For venous drainage, a ...

journal_title：Artificial organs

authors： Schopka S,Haneya A,Rupprecht L,Camboni D,Schmid C,Hilker M

更新日期：2012-08-01 00:00:00

abstract：:The in vitro development of a vascular stroma might be a solution for the engineering of vascularized tissues, however, in vitro stability of capillary-like structures is limited. In order to test the influence on maintenance of capillary-like structures, human growth hormone (hGH) was added in concentrations of 0.5, ...

journal_title：Artificial organs

authors： Frerich B,Kurtz-Hoffmann J,Lindemann N

更新日期：2005-04-01 00:00:00

abstract：:Robotic surgery for intracardiac pathologies in children is relatively uncommon. This study presents our initial experience with robotic-assisted cardiac surgery in children. We also present the feasibility and safety of robotic surgery in children. From May 2013 to June 2018, 30 children underwent totally endoscopic ...

journal_title：Artificial organs

authors： Onan B,Aydin U,Kadirogullari E,Onan IS,Sen O

更新日期：2019-04-01 00:00:00

abstract：:Biofilms are communities of bacteria that can cause infections which are resistant to the immune system and antimicrobial treatments, posing a significant threat for patients with implantable and indwelling medical devices. The purpose of our research was to determine if utilizing specific parameters for electric curr...

journal_title：Artificial organs

authors： Haddad PA,Mah TF,Mussivand T

更新日期：2016-08-01 00:00:00

abstract：:Over the past several years, we have developed novel titanium-niobium-zirconium (Ti-Nb-Zr) alloys to address the long-term performance needs of orthopedic implants. The unique properties of these alloys also render them promising candidates for blood pumps. These properties include excellent biocompatibility in combin...

journal_title：Artificial organs

authors： Davidson JA,Daigle KP,Kovacs P

更新日期：1996-05-01 00:00:00

abstract：:We treated 12 patients with rheumatoid arthritis by filtration leukocytapheresis (FLCP) and evaluated its effect on leukocyte enzyme activities. We calculated the number of leukocytes removed and assessed the clinical response. We also evaluated the cellular enzyme activities of elastase and dipeptidylpeptidase IV (DP...

journal_title：Artificial organs

authors： Yamasaki S,Ueki Y,Nakamura H,Yano M,Matsumoto K,Miyake S,Tominaga T,Tominaga M,Eguchi K

更新日期：2002-04-01 00:00:00

abstract：:Neurological morbidity is a major concern in pediatric cardiac surgery. Cardiopulmonary bypass is one of the few modifiable factors affecting neurodevelopmental outcome. This study aimed to measure the incidence of abnormalities apparent by magnetic resonance imaging (MRI) after neonatal arterial switch operation usin...

journal_title：Artificial organs

authors： Durandy Y,Rubatti M,Couturier R,Rohnean A

更新日期：2011-11-01 00:00:00

abstract：:Using urea and inulin as markers, we have developed a simple method to calculate intracellular and extracellular fluid volume in patients before and after hemofiltration therapy. During conventional hemofiltration using substitution fluid with a Na+ concentration of 140 mEq/L, a decrease in extracellular fluid volume ...

journal_title：Artificial organs

authors： Kimura G,Satani M,Kojima S,Kuroda K,Itoh K,Ikeda M

更新日期：1982-02-01 00:00:00

abstract：:We made miniature modules filled with artificial oxygenator hollow fibers and conducted a simple experiment to study the effect of different membrane structures on the blood. Three types of modules were made: one filled with polyolefin, one filled with polypropylene, and a blank module. The 3 modules were connected th...

journal_title：Artificial organs

authors： Nishida H,Shibuya M,Endo M,Koyanagi H

更新日期：1996-12-01 00:00:00

abstract：:Low molecular weight heparin (LMH) acts as an anticoagulation agent mainly through its anti-activated coagulation factor X (Xa) activity. Thrombelastography (TEG) is expected to be useful to monitor the dosage of LMH during hemodialysis because reaction time on TEG (TEG-r) is considered to reflect blood thromboplastin...

journal_title：Artificial organs

authors： Shinoda T,Arakura H,Katakura M,Shirota T,Nakagawa S

更新日期：1990-12-01 00:00:00

abstract：:A beta2-microglobulin (beta2M) selective adsorbent (Lixelle) for direct hemoperfusion has been used for the treatment of hemodialysis patients with the long-term complication of dialysis related amyloidosis (DRA), but there is no significant correlation between the serum level of beta2M and the occurrence of DRA. Infl...

journal_title：Artificial organs

authors： Tsuchida K,Takemoto Y,Nakamura T,Fu O,Okada C,Yamagami S,Kishimoto T

更新日期：1998-12-01 00:00:00

abstract：:A totally implantable centrifugal artificial heart has been developed in which a pivot bearing supported centrifugal pump is used as a blood pump. The following have been adopted as blood contacting materials in our pump: titanium alloy (Ti-6A1-4V) for the housing and impeller, alumina ceramic (Al2O3) for the male piv...

journal_title：Artificial organs

authors： Takami Y,Yamane S,Makinouchi K,Niimi Y,Sueoka A,Nosé Y

更新日期：1998-09-01 00:00:00

abstract：:Centrifugal pumps are generally employed as nonpulsatile blood flow pumps; however, these pumps can produce pulsatile flow by periodically alternating the impeller rotation speed. This study investigates blood trauma due to the effect of pulse frequency and various ranges of pump speed. The hemolysis tests were conduc...

journal_title：Artificial organs

authors： Tayama E,Niimi Y,Takami Y,Ohashi Y,Ohtsuka G,Glueck JA,Mueller J,Nosé Y

更新日期：1997-12-01 00:00:00

abstract：:The aim of this study was to investigate whether the use of a medically approved biodegradable scaffold as a solid support system would enhance graft survival following transplantation into the omental pouch in a preclinical large animal model. Six beagle dogs underwent total pancreatectomy followed by islet autotrans...

journal_title：Artificial organs

authors： Kin T,O'Neil JJ,Pawlick R,Korbutt GS,Shapiro AM,Lakey JR

更新日期：2008-12-01 00:00:00

abstract：:The rotational axis of the centrifugal pump has some associated problems such as blood destruction and sealing between the axis and pump housing. To improve upon these deficits we have developed a new type of blood pump, the magnetic rotary pump (MRP). The MRP has an original design with no rotational axis and no impe...

journal_title：Artificial organs

authors： Naganuma S,Yambe T,Sonobe T,Kobayashi S,Nitta S

更新日期：1997-07-01 00:00:00

abstract：:This study introduces a newly developed method for the formation of a stationary phase superficially embedded with immunoadsorbent, that is partially incomplete two-stage polymerization of acrylamide. Preliminary experimental studies show that binding activity of the immunoadsorbent was satisfactorily maintained after...

journal_title：Artificial organs

authors： Yang TH

更新日期：2005-05-01 00:00:00

abstract：:A relative contraindication to intermittent peritoneal dialysis (IPD) is chronic lung disease. To evaluate whether the instillation of 2 L of fluid into the peritoneal cavity affects respiratory function, five IPD patients were studied in the supine position during the first 4 h of a routine IPD session. Blood gas ten...

journal_title：Artificial organs

authors： Korzets Z,Pomeranz A,Shachor Y,Bernheim J

更新日期：1988-06-01 00:00:00

abstract：:Neurologic complications during neonatal extracorporeal life support (ECLS) are associated with significant morbidity and mortality. Gaseous microemboli (GME) in the ECLS circuit may be a possible cause. Advances in neonatal circuitry may improve hemodynamic performance and GME handling leading to reduction in patient...

journal_title：Artificial organs

authors： Glass K,Trivedi P,Wang S,Woitas K,Kunselman AR,Ündar A

更新日期：2017-04-01 00:00:00

abstract：:Aseptic joint loosening is a key factor that reduces the life span of arthroplasty. There are currently few effective treatments for joint loosening except surgical revision. We explored the inhibitory effects of tumor necrosis factor (TNF)-alpha-targeted small interfering RNA (siRNA) on particle-induced inflammatory ...

journal_title：Artificial organs

authors： Qin CQ,Ding Y,Huang DS,Xu J,Ma RF,Huang JB

更新日期：2011-07-01 00:00:00

abstract：:A new intravascular pumping oxygenator (IVPO) was developed for intravascular gas exchange and circulatory assistance in critically ill patients with respiratory and circulatory failure. The IVPO utilizes new silicone hollow fibers (diameter, 1 mm; membrane width, 50 microns) and consists of two driving tubes for the ...

journal_title：Artificial organs

authors： Sueda T,Fukunaga S,Morita S,Sueshiro M,Hirai S,Okada K,Orihashi K,Matsuura Y

更新日期：1997-01-01 00:00:00

abstract：:A centrifugal blood pump with a double pivot impeller and an eccentric inlet port is being developed as an implantable artificial heart by the Baylor College of Medicine and Miwatec Co. Ltd. Flow visualization measurements were conducted to compare the flow around the pivot for two impeller operational modes: the top ...

journal_title：Artificial organs

authors： Yamane T,Kodama T,Nishida M,Maruyama O,Yamamoto Y,Shinohara T,Motomura T,Nosé Y

更新日期：2006-01-01 00:00:00

abstract：:The purpose was to evaluate the cytotoxicity of two novel formulations (alpha and beta) of calcium phosphate cements. Positive control, represented by a commercial hydroxyapatite cement, and negative control were included for comparative purposes. A continuous lineage of fibroblastic cells was used, and the effect of ...

journal_title：Artificial organs

authors： Rossa C Jr,Marcantonio E Jr,Santos LA,Boschi AO,Raddi MS

更新日期：2005-02-01 00:00:00

abstract：:Ten dialysis patients were followed in a prospective study to determine the neurotoxicity of metabolites in the middle molecule (MM) molecular weight (mol wt) range of 500-200 daltons/molecule. In the absence of readily available direct serum measurements of MM concentrations, a theoretically calculated dialysis index...

journal_title：Artificial organs

authors： Milutinovic J,Babb AL,Eschbach JW,Follette WC,Graefe U,Strand MJ,Scribner BH

更新日期：1978-02-01 00:00:00

abstract：:We have developed a novel method to simultaneously evaluate thromboresistance of two different types of drip chambers with a filter used in extracorporeal blood circuits for hemodialysis using canine arteriovenous shunt models. Bilateral bypasses between the femoral artery and vein on both sides of the animal were for...

journal_title：Artificial organs

authors： Yamazaki M,Kobayashi K,Mori Y,Satoh T,Kubota S

更新日期：1997-02-01 00:00:00

abstract：:The new Advanced ventricular assist device (Advanced VAD) has many features such as improving pulsatility and preventing regurgitant flow during pump stoppage. The purpose of this study was to evaluate the effects of design modifications of the Advanced VAD on these features in vitro. Bench testing of four versions of...

journal_title：Artificial organs

authors： Miyamoto T,Byram N,Karimov JH,Adams J,Dessoffy R,Kuban BD,Gao S,Horvath DJ,Fukamachi K

更新日期：2019-10-01 00:00:00

abstract：:The BiVACOR is a novel rotary Biventricular Assist Device (BiVAD) undergoing development to treat global end-stage heart failure. The design includes left and right vanes positioned on a shared rotating hub to form a double-sided magnetically and hydrodynamically suspended centrifugal impeller. The performance of the ...

journal_title：Artificial organs

authors： Timms D,Fraser J,Hayne M,Dunning J,McNeil K,Pearcy M

更新日期：2008-10-01 00:00:00

abstract：:Tumor necrosis factor-alpha (TNF-alpha) release has been implicated in a sepsis-like syndrome following cardiopulmonary bypass (CPB). This also may be important in patients who have had a left ventricular assist device (LVAD) implanted. This report investigates the effect of reducing systemic blood flow on hemodynamic...

journal_title：Artificial organs

authors： Uozaki Y,Dihmis WC,Yamauchi H,Moczar M,Miyama M,Pasteau F,Tixier D,Bambang SL,Loisance DY

更新日期：2001-02-01 00:00:00

abstract：:The aim of this study was to develop procedures for the diagnosis and nonsurgical management of decreased insulin flow in an implantable programmable pump for long-term intraperitoneal or intravenous insulin delivery featuring a sideport. Patency of the catheter lumen was tested by measuring the time needed for sidepo...

journal_title：Artificial organs

authors： Scavini M,Reich S,Eaton RP,Charles MA,Dunn FL

更新日期：1996-09-01 00:00:00