Transcutaneous Energy Transfer with Voltage Regulation for Rotary Blood Pumps

Mussivand, Tofy; Holmes, Kevin S.; Hum, Albert; Keon, Wilbert J.

doi:10.1111/j.1525-1594.1996.tb04492.x

Cited by 17 publications

(12 citation statements)

References 6 publications

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“…TET systems have been used in the AbioCor total artificial heart from Abiomed and the Arrow LionHeart LVAD. The AbioCor TET system performs with an efficiency ranging from 68 to 72% for coil separations between 3 mm and 10 mm (10,11). The LionHeart system requires a minimum of 14 W, and the system also contains an internal rechargeable battery that allows for 20 min of operational time without the TET system (12).…”

Section: Discussionmentioning

confidence: 99%

A Novel Low Temperature Transcutaneous Energy Transfer System Suitable for High Power Implantable Medical Devices: Performance and Validation in Sheep

Dissanayake

Budgett

Hu³

et al. 2010

Artificial Organs

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Transcutaneous energy transfer (TET) systems use magnetic fields to transfer power across the skin without direct electrical connectivity. This offers the prospect of lifetime operation and overcomes risk of infection associated with wires passing through the skin. Previous attempts at this technology have not proved suitable due to poor efficiency, large size, or tissue damage. We have developed a novel approach utilizing frequency control that allows for wide tolerance in the alignment between internal and external coils for coupling variations of 10 to 20 mm, and relatively small size (50 mm diameter, 5 mm thickness). Using a sheep experimental model, the secondary coil was implanted under the skin in six sheep, and the system was operated to deliver a stable power output to a 15 W load continuously over 4 weeks. The maximum surface temperature of the secondary coil increased by a mean value of 3.4 +/- 0.4 degrees C (+/-SEM). The highest absolute mean temperature was 38.3 degrees C. The mean temperature rise 20 mm from the secondary coil was 0.8 +/- 0.1 degrees C. The efficiency of the system exceeded 80% across a wide range of coil orientations. Histological analysis revealed no evidence of tissue necrosis or damage after four weeks of operation. We conclude that this technology is able to offer robust transfer of power to implantable devices without excess heating causing tissue damage.

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Section: Discussionmentioning

confidence: 99%

A Novel Low Temperature Transcutaneous Energy Transfer System Suitable for High Power Implantable Medical Devices: Performance and Validation in Sheep

Dissanayake

Budgett

Hu³

et al. 2010

Artificial Organs

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“…Power transmitted to the heaters is provided by a transcutaneous energy transmission (TET) system. A typical setup of TET system consists of an AC power supply connected with a primary coil for providing an alternating magnetic field, and a secondary coil in which AC current could be induced and transmitted to a load (15)(16)(17)(18). In our design, the secondary coil was electrically connected to the foil heaters.…”

Section: Materials and Basic Designmentioning

confidence: 99%

Preclinical development of SMA artificial anal sphincters

Luo

Higa

Amae

et al. 2006

Minimally Invasive Therapy & Allied Technologies

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This article presents some progress in the development for preclinical trials of an artificial anal sphincter using shape memory alloys. The novel device has been proposed and developed by the author's group at Tohoku University. It has two dominant features different from other systems, which are either clinically available or still under development. One is that a solid driving element, a combination of shape memory alloy (SMA) ribbons and silicone elastomer sheets with a layered structure, is adopted for the opening and closing functions of the artificial sphincter. The other is a sandwich mechanism for the closing of bowel to reduce the risk of buckling induced ischemia which has been reported in hydraulically driven artificial sphincters with a radial squeezing mechanism. The device has fewer parts inside the body and therefore be implanted more easily. A new design eliminating the risk of heat burns enables long-term implantation and brings the device closer to practical use. Functionality and safety of the device have been proved in three-month animal experiments.

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“…It generates electrical pulses and these pulses simulate the heart. [20,24,29,30,31] A pulse generator is connected with electrodes and these electrodes are attached to the heart.…”

Section: Cardiac Pacemakermentioning

confidence: 99%

Reviewing Transcutaneous Power Supplies for High Power Implantable Heart Pumps

Vaidya¹,

Tjprc²

2019

IJMPERD

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This paper focuses on incorporating Transcutaneous Energy Transfer System (TETs) for medical implants which requires very high power, especially Total Artificial Heart (TAH) and Left Ventricular Assistant Devices (LVADs). These implants consume high power in the range 3 to 30W. So, these are conventionally powered using a percutaneous lead. This lead passes through the abdominal skin of a patient to connect to an external power supply. This skin area around the lead represents a source of potential infections and requires frequent treatment and surgery for replacing the leads. TET system can deliver power wirelessly and is widely in use for low power medical implants. Therefore, it gained immense interest to determine its suitability for high power implants. Thus, this paper presented a review of various commercial TAHs and LVADs and their power requirements. From the review, for high power implants, TET needs to overcome the limitations of the temperature variation of coils, impedance mismatch, and discontinuity in required power delivery. In the end, directions for future work are provided to fill these voids and to develop a TET system suitable for high power TAHs and LVADs.

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Transcutaneous Energy Transfer with Voltage Regulation for Rotary Blood Pumps

Cited by 17 publications

References 6 publications

A Novel Low Temperature Transcutaneous Energy Transfer System Suitable for High Power Implantable Medical Devices: Performance and Validation in Sheep

A Novel Low Temperature Transcutaneous Energy Transfer System Suitable for High Power Implantable Medical Devices: Performance and Validation in Sheep

Preclinical development of SMA artificial anal sphincters

Reviewing Transcutaneous Power Supplies for High Power Implantable Heart Pumps

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