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PubMed Journals Articles About "Smartphone Enabled Wireless Batteryless Implantable Blood Flow Sensor" RSS

18:52 EST 20th February 2020 | BioPortfolio

Smartphone Enabled Wireless Batteryless Implantable Blood Flow Sensor PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Smartphone Enabled Wireless Batteryless Implantable Blood Flow Sensor articles that have been published worldwide.

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Showing "smartphone enabled wireless batteryless implantable blood flow sensor" PubMed Articles 1–25 of 14,000+

A smartphone-enabled wireless and batteryless implantable blood flow sensor for remote monitoring of prosthetic heart valve function.

Aortic valve disease is one of the leading forms of complications in the cardiovascular system. The failing native aortic valve is routinely surgically replaced with a bioprosthesis. However, insufficient durability of bioprosthetic heart valves often requires reintervention. Valve degradation can be assessed by an analysis of the blood flow characteristics downstream of the valve. This is cost and labor intensive using clinical methodologies and is performed infrequently. The integration of consumer smartp...


Wireless Monitoring Using a Stretchable and Transparent Sensor Sheet Containing Metal Nanowires.

Mechanically and visually imperceptible sensor sheets integrated with lightweight wireless loggers are employed in ultimate flexible hybrid electronics (FHE) to reduce vital stress/nervousness and monitor natural biosignal responses. The key technologies and applications for conceptual sensor system fabrication are reported, as exemplified by the use of a stretchable sensor sheet completely conforming to an individual's body surface to realize a low-noise wireless monitoring system (

Wirelessly powered signal regeneration to improve the remote detectability of an inductive pressure sensor.

Chronic pressure monitoring by wireless and batteryless sensors are desirable for maintaining proper function of biomedical implants. Compared to capacitive, piezoelectric and piezoresistive sensors, inductive sensors are less susceptible to capacitance fluctuation in the environment, and they can convert loading pressure into inductance changes for wireless detection as resonance frequency shifts. However, inductive sensors normally require the use of ferromagnetic materials for frequency tuning; their fre...


Diabetic remission in a cat treated with an implantable pump to deliver insulin.

A diabetic cat was referred because of poor metabolic control and difficulties the owner experienced injecting insulin. A pump, telemetrically controlled with a smartphone, was implanted subcutaneously to deliver insulin. Before implantation, the pump reservoir was filled with a rapid-acting human recombinant insulin. The insulin was administered through continuous infusion or periodic boluses over 2 weeks while the cat was hospitalized and over another 2 weeks after discharge from the hospital. Adjustments...

Telemetric measurement of intraocular pressure via an implantable pressure sensor - twelve-month results from the ARGOS-02 trial.

The aim of this study was to investigate the safety and performance of the second generation of an implantable intraocular pressure (IOP) sensor in patients with primary open angle glaucoma (POAG).

A Novel Technology for Free Flap Monitoring: Pilot Study of a Wireless, Biodegradable Sensor.

 Accurate monitoring of free flap perfusion after complex reconstruction is critical for early recognition of flap compromise. Surgeons use a variety of subjective and objective measures to evaluate flap perfusion postoperatively. However, these measures have some limitations. We have developed a wireless, biodegradable, and flexible sensor that can be applied to real-time postoperative free flap monitoring. Here we assess the biocompatibility and function of our novel sensor.

Optimal Transmit Power Allocation for an Energy-Harvesting Sensor in Wireless Cyber-Physical Systems.

In this article, we investigate optimal transmission power allocation at a sensor equipped with the energy-harvesting technology for remote state estimation in wireless cyber-physical systems. The sensor has access to an energy harvester, which can collect energy from the external environment and is an everlasting but unreliable energy source compared with conventional batteries. For the wireless dropping communication channel, the packet dropout rates depend on both the signal-to-noise ratio and the transm...

A Microelectronic Sensor Device Powered by a Small Implantable Biofuel Cell †.

Biocatalytic buckypaper electrodes modified with pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenase and bilirubin oxidase for glucose oxidation and oxygen reduction, respectively, were prepared for their use in a biofuel cell. A small (millimeter-scale; 2 × 3 mm2) enzyme-based biofuel cell was tested in a model glucose-containing aqueous solution, in human serum, and as an implanted device in a living gray garden slug (Deroceras reticulatum), producing electrical power in the range of 2-10 µW ...

Internal Jugular Vein as Alternative Access for Implantation of a Wireless Pulmonary Artery Pressure Sensor.

A wireless pulmonary artery pressure sensor (CardioMEMS) is approved for implantation via the femoral vein. The internal jugular vein (IJ) is an attractive alternative access route commonly used in pulmonary artery catheterization.

A Novel Roller Pump for Physiological Flow.

Having physiological correct flow waveforms is a key feature for experimental studies of blood flow, especially in the process of developing and testing a new medical device such as stent, mechanical heart valve or any implantable medical device that involves circulation of blood through the device. It is also a critical part of a perfusion system for cardiopulmonary bypass (CPB) and extracorporeal membrane oxygenation (ECMO) procedures. This study investigated the feasibility of a novel roller pump for use...

Flexible and fully implantable upconversion device for wireless optogenetic stimulation of the spinal cord in behaving animals.

Wireless optogenetics based on the upconversion technique has recently provided an effective and interference-free alternative for remote brain stimulation and inhibition in behaving animals, which is of great promise for neuroscience research. However, more versatile upconversion devices are yet to be implemented for neural tissues other than the brain. In this study, a flexible and fully implantable upconversion device was developed for epidural spinal cord stimulation. The upconversion device was fabrica...

Frameworks for Efficient Brain-Computer Interfacing.

One challenge present in brain-computer interface (BCI) circuits is finding a balance between real-time on-chip processing in-vivo and wireless transmission of neural signals for off-chip in-silico processing. This article presents three potential frameworks for investigating an area- and energy-efficient realization of BCI circuits. The first framework performs spike detection on the filtered neural signal on a brain-implantable chip and only transmits detected spikes wirelessly for offline classification ...

ECMO with vasopressor use during early endotoxic shock: Can it improve circulatory support and regional microcirculatory blood flow?

While extracorporeal membrane oxygenation (ECMO) is effective in preventing further hypoxemia and maintains blood flow in endotoxin-induced shock, ECMO alone does not reverse the hypotension. In this study, we tested whether concurrent vasopressor use with ECMO would provide increased circulatory support and blood flow, and characterized regional blood flow distribution to vital organs.

Vascular Pressure-Flow Measurement Using CB-PDMS Flexible Strain Sensor.

Regular monitoring of blood flow and pressure in vascular reconstructions or grafts would provide early warning of graft failure and improve salvage procedures. Based on biocompatible materials, we have developed a new type of thin, flexible pulsation sensor (FPS) which is wrapped around a graft to monitor blood pressure and flow. The FPS used carbon black (CB) nanoparticles dispersed in polydimethylsiloxane (PDMS) as a piezoresistive sensor layer, which was encapsulated within structural PDMS layers and co...

Supraparticle Assemblies of Magnetic Nanoparticles and Quantum Dots for Selective Cell Isolation and Counting on a Smartphone-Based Imaging Platform.

There are numerous diagnostic and therapeutic applications for the detection and enumeration of specific cell types. Flow cytometry is the gold standard technique for this purpose but is poorly suited to point-of-need assays. The ideal platform for these assays would combine the immunocytochemical capabilities of flow cytometry with low-cost, portable instrumentation, and a simple and rapid assay workflow. Here, we present a smartphone-based imaging platform (SIP) in tandem with magnetic-fluorescent suprana...

Implementation and 2-year outcomes of the first FDA-approved implantable apheresis vascular access device.

Patients requiring chronic apheresis treatments typically lack sufficient peripheral venous access to support long-term therapy. Historically, central venous tunneled catheters, septum-bearing subcutaneous ports, and fistulas were used to obtain required blood flow rates for apheresis procedures. In 2017, the US Food and Drug Administration approved the first intravascular device specifically designed for apheresis therapy, the PowerFlow Implantable Apheresis IV Port.

Dynamic cerebral perfusion parameters and magnetic nanoparticle accumulation assessed by AC biosusceptometry.

Cerebral blood flow (CBF) assessment is mainly performed by scintigraphy, computed tomography (CT) and magnetic resonance imaging (MRI). New approaches to assess the CBF through the passage of magnetic nanoparticles (MNPs) to blood-brain barrier (BBB) are convenient to help decrease the use of ionizing radiation and unleash the required MRI schedule in clinics. The development of nanomedicine and new biomedical devices, such as the magnetic particle imaging (MPI), enabled new approaches to study dynamic bra...

Wireless, passive strain sensor in a doughnut-shaped contact lens for continuous non-invasive self-monitoring of intraocular pressure.

After cataract, glaucoma is the second leading cause of blindness worldwide and real-time monitoring of intraocular pressure (IOP) is of great demand. We present a wireless, passive sensor sitting inside a customized, planar and circular doughnut-shaped contact lens capable of continuous monitoring of the change in the curvature of cornea caused by IOP fluctuations. The sensor consists of a constant capacitor and a variable inductor in the form of a stretchable, closed-loop, serpentine wire that serves as b...

Neuromuscular Function and Blood Flow Occlusion with Dynamic Arm Flexor Contractions.

Blood flow restricted or occlusion exercise enhances muscle hypertrophy and strength during resistance training. The acute effects on voluntary and electrically evoked muscle contractile characteristics with impaired blood flow at low and high contraction forces has not been explored.

Blood flow quantification in dialysis access using digital subtraction angiography: A retrospective study.

Vascular access is the "lifeline" of end-stage renal disease patients, which is surgically constructed to remove blood-waste and return artificially filtered blood into circulation. The arteriovenous shunting causes an abrupt change in blood flow and results in increased fluidic stress, which predisposes to access stenosis and thrombosis. While access flow is crucial to evaluate interventional endpoint, application to measure flow using digital angiogram is not yet available. The goal of this study was to d...

A nanocellulose-based colorimetric assay kit for smartphone sensing of iron and iron-chelating deferoxamine drug in biofluids.

The current work describes the development of a "nanopaper-based analytical device (NAD)", through the embedding of curcumin in transparent bacterial cellulose (BC) nanopaper, as a colorimetric assay kit for monitoring of iron and deferoxamine (DFO) as iron-chelating drug in biological fluids such as serum blood, urine and saliva. The iron sensing strategy using the developed assay kit is based on the decrease of the absorbance/color intensity of curcumin-embedded in BC nanopaper (CEBC) in the presence of F...

Increased Optic Nerve Head Capillary Blood Flow in Early Primary Open-Angle Glaucoma.

Blood flow in the optic nerve head (ONH) is known to be reduced in eyes with advanced glaucoma. However, experimental results from non-human primates suggest an initial increase in ONH blood flow at the earliest stages of damage. This study assesses flow and pulsatile hemodynamics across a range of severities to test the hypothesis that this also occurs in human glaucoma.

A Smartphone-only Pulse Transit Time Monitor Based on Cardio-mechanical and Photoplethysmography Modalities.

This paper reports a system for monitoring pulse transit time (PTT). Using an Android smartphone and a customized sensing circuit, the system collects seismo-cardiogram (SCG), gyro-cardiogram (GCG), and photoplethysmogram (PPG) recordings. There is no need for any other external stand-alone systems. The SCG and GCG signals are recorded with the inertial sensors of the smartphone, while the PPG signal is recorded using a sensing circuit connected to the audio jack of the phone. The sensing circuit is battery...

INVESTIGATION OF RADIATION BACKGROUND IN THE MICRODISTRICTS OF KROPYVNYTSKYI USING DOSIMETER-RADIOMETER MKS-08-01 Gm «DKS-96» AND WIRELESS SENSORS.

Determine the radiation background in the Kropyvnytskyi microdistricts using the dosimeter-radiometer MKS-08-01 Gm «DKS-96» and a wireless sensor (dosimeter), analyze the measured values using the Student's t-test and create radiation background interactive map of Kropyvnytskyi microdistricts.

Alterations in Skin Blood Flow at the Fingertip Are Related to Mortality in Patients With Circulatory Shock.

Skin blood flow is rapidly altered during circulatory shock and may remain altered despite apparent systemic hemodynamic stabilization. We evaluated whether changes in skin blood flow during circulatory shock were related to survival.


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