Progress with the HeartSaver ventricular assist device

Mussivand, Tofy; Hendry, Paul; Masters, Roy G.; King, Mike; Holmes, Kevin S.; Keon, Wilbert J.

doi:10.1016/s0003-4975(99)00523-8

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…To the best of our knowledge, previous efforts to combine RM with ventricular assist devices (VADs) have not yielded products available in the market yet , except the HeartAssist‐5 LVAD (MicroMed Cardiovascular, Inc., Houston, TX, USA). The HeartAssist‐5 LVAD, formerly known as the MicroMed DeBakey VAD , is currently the unique LVAD that has RM technology.…”

Section: Methodsmentioning

confidence: 99%

Remote Monitoring of Left Ventricular Assist Device Parameters After HeartAssist‐5 Implantation

et al. 2013

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Although several left ventricular assist devices (LVADs) have been used widely, remote monitoring of LVAD parameters has been available only recently. We present our remote monitoring experience with an axial-flow LVAD (HeartAssist-5, MicroMed Cardiovascular, Inc., Houston, TX, USA). Five consecutive patients who were implanted a HeartAssist-5 LVAD because of end-stage heart failure due to ischemic (n=4) or idiopathic (n=1) cardiomyopathy, and discharged from hospital between December 2011 and January 2013 were analyzed. The data (pump speed, pump flow, power consumption) obtained from clinical visits and remote monitoring were studied. During a median follow-up of 253 (range: 80-394) days, fine tuning of LVADs was performed at clinical visits. All patients are doing well and are in New York Heart Association Class-I/II. A total of 39 alarms were received from three patients. One patient was hospitalized for suspected thrombosis and was subjected to physical examinations as well as laboratory and echocardiographic evaluations; however, no evidence of thrombus washout or pump thrombus was found. The patient was treated conservatively. Remaining alarms were due to insufficient water intake and were resolved by increased water consumption at night and summer times, and fine tuning of pump speed. No alarms were received from the remaining two patients. We believe that remote monitoring is a useful technology for early detection and treatment of serious problems occurring out of hospital thereby improving patient care. Future developments may ease troubleshooting, provide more data from the patient and the pump, and eventually increase physician and patient satisfaction. Despite all potential clinical benefits, remote monitoring should be taken as a supplement to rather than a substitute for routine clinical visits for patient follow-up.

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Section: Methodsmentioning

confidence: 99%

Remote Monitoring of Left Ventricular Assist Device Parameters After HeartAssist‐5 Implantation

et al. 2013

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“…It is a very good choice for energy harvesting for bio-medical devices [20]. For humans, a space of several cubic centimeters is available, for example, up to 480 cm 3 [21]. First of all, the diaphragm is a strong muscle.…”

Section: The Diaphragm Muscle As An Energy Sourcementioning

confidence: 99%

“…The second feature of this muscle is that it provides us a relatively large space for placing electrostatic generator. For humans, a space of several cubic centimeters is available, for example, up to 480 cm 3 [21]. Another feature of the diaphragm muscle is its continuous movement.…”

Section: The Diaphragm Muscle As An Energy Sourcementioning

confidence: 99%

A new electro‐static micro‐generator for energy harvesting from diaphragm muscle

Daneshvar

Maymandi-Nejad

2017

Circuit Theory & Apps

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In this paper, we propose a new energy scavenging system for powering bio-implantable devices. Different available energy sources and micro-generators are examined. The operation of electrostatic generators will be examined in detail, and their design issues are discussed. The proposed generator is analyzed, and a closed form formula is developed for the capacitor voltages. Also, an equation is obtained for the output power for the proposed circuit. It will be shown that the diaphragm muscle in conjunction with the electrostatic micro-generator can be used to extract energy from human body. The diaphragm muscle has a continuous movement with a relatively fixed frequency. There is enough space around this muscle to place the micro-generator. Using the proposed system, it will be shown that it is possible to produce 230 mW power in a 125 mm 3 volume from the diaphragm muscle.As can be seen from (32), the generated energy depends on the total capacitance variations during phases 5 and 10. It is worth noting that ΔC tot depends on the V CV at the end of the phases 4 and 9.Infineon SMD MOSFET transistors (BSL215C). The circuit is also simulated in HSPICE using 0.18 CMOS technology. The operation of the proposed system is compared with a few other microgenerators. 2328S.H. DANESHVAR AND M. MAYMANDI-NEJAD

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“…A series of in vivo bovine studies with durations of support up to 30 days has been performed. Preparations for future human use are awaiting regulatory approval 64 (Figure 18). …”

Section: Future Prospectsmentioning

confidence: 99%

Critical review of current left ventricular assist devices

Akdis

et al. 2000

Perfusion

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Progress with the HeartSaver ventricular assist device

Cited by 9 publications

References 11 publications

Remote Monitoring of Left Ventricular Assist Device Parameters After HeartAssist‐5 Implantation

Remote Monitoring of Left Ventricular Assist Device Parameters After HeartAssist‐5 Implantation

A new electro‐static micro‐generator for energy harvesting from diaphragm muscle

Critical review of current left ventricular assist devices

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