Radio aneurysm coils for noninvasive detection of cerebral embolization failures: A preliminary study

Mohammadi, Abdolreza; Chen, Keqin; Ali, Mohamed Sultan Mohamed; Takahata, Kenichi

doi:10.1016/j.bios.2011.09.033

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…The copper-coated stent was prepared and tested secondly. After this, the copper layer was etched away in a wet etchant, and then gold was coated on In this test, the stent was coupled with a discrete capacitor (of 10 pF) as a dummy of a capacitive pressure sensor to form an L-C tank and used to evaluate the dependence of its f R on different surrounding media, air, deionized (DI) water and saline (0.01M) as a substitute of blood [28].…”

Section: Experimental Preparation and Setupsmentioning

confidence: 99%

Inductive antenna stent: design, fabrication and characterization

Mohammadi

Ali

Lappin

et al. 2013

J. Micromech. Microeng.

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This paper describes the design, fabrication, and electromechanical characteristics of inductive stents developed for intelligent stent applications. The stents, fabricated out of 316L stainless-steel tubes using laser machining, are patterned to have zigzag loops without bridge struts, and when expanded, become a helix-like structure. Highly conductive metals such as copper and gold are coated on the stents to improve their inductive/antenna function. The Q-factor of the stent is shown to increase by a factor of 7 at 150 MHz with copper coating. The expansion of the stent from 2 to 4 mm diameter results in a 3.2× increase in the inductance, obtaining ∼1 µH at a similar frequency. The stent passivated by Parylene-C film is used to characterize its resonance in different media including saline. The copper-coated inductive stent exhibits a 2.4× radial stiffness for 1 mm strain as well as a 16× bending compliance compared with a commercial stent, each of which is potentially beneficial in preventing/mitigating stent failures such as recoil as well as enabling easier navigation through intricate blood vessels. The mechanical stiffness may be tailored by adjusting stent-wire thickness while maintaining necessary coating thickness to achieve particular mechanical requirements and high inductive performance simultaneously.

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Section: Experimental Preparation and Setupsmentioning

confidence: 99%

Inductive antenna stent: design, fabrication and characterization

Mohammadi

Ali

Lappin

et al. 2013

J. Micromech. Microeng.

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“…The wireless device was characterized when implanted in saline and meat to replicate in vivo conditions of blood and tissue. A saline concentration of 0.08 M was used to match the conductivity to blood ( 62 – 64 ). The meat was wrapped around the artery model to the specified thickness and extended more than 4 cm away from the implanted stent in both directions along the axial length.…”

Section: Methodsmentioning

confidence: 99%

Fully implantable wireless batteryless vascular electronics with printed soft sensors for multiplex sensing of hemodynamics

et al. 2022

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The continuous monitoring of hemodynamics attainable with wireless implantable devices would improve the treatment of vascular diseases. However, demanding requirements of size, wireless operation, and compatibility with endovascular procedures have limited the development of vascular electronics. Here, we report an implantable, wireless vascular electronic system, consisting of a multimaterial inductive stent and printed soft sensors capable of real-time monitoring of arterial pressure, pulse rate, and flow without batteries or circuits. Developments in stent design achieve an enhanced wireless platform while matching conventional stent mechanics. The fully printed pressure sensors demonstrate fast response times, high durability, and sensing at small bending radii. The device is monitored via inductive coupling at communication distances notably larger than prior vascular sensors. The wireless electronic system is validated in artery models, while minimally invasive catheter implantation is demonstrated in an in vivo rabbit study. Overall, the vascular system offers an adaptable framework for comprehensive monitoring of hemodynamics.

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“…Wireless sensors have a wide range of uses in biomedical technologies. For the past sixty years, studies on telemetric medical diagnostics functioning in the radio frequency (RF) have been conducted [18][19][20][21]. Most of these devices work by making use of passive inductor-capacitor (LC) resonant circuits with varying resonant frequencies based on various biological or physiological variables of interest.…”

Section: Wireless Pressure Sensor Monitoring Methodsmentioning

confidence: 99%

Health Care Monitoring and Treatment for Coronary Artery Diseases: Challenges and Issues

Alghrairi

Sulaiman

Mutashar

2020

Sensors

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In-stent restenosis concerning the coronary artery refers to the blood clotting-caused re-narrowing of the blocked section of the artery, which is opened using a stent. The failure rate for stents is in the range of 10% to 15%, where they do not remain open, thereby leading to about 40% of the patients with stent implantations requiring repeat procedure within one year, despite increased risk factors and the administration of expensive medicines. Hence, today stent restenosis is a significant cause of deaths globally. Monitoring and treatment matter a lot when it comes to early diagnosis and treatment. A review of the present stent monitoring technology as well as the practical treatment for addressing stent restenosis was conducted. The problems and challenges associated with current stent monitoring technology were illustrated, along with its typical applications. Brief suggestions were given and the progress of stent implants was discussed. It was revealed that prime requisites are needed to achieve good quality implanted stent devices in terms of their size, reliability, etc. This review would positively prompt researchers to augment their efforts towards the expansion of healthcare systems. Lastly, the challenges and concerns associated with nurturing a healthcare system were deliberated with meaningful evaluations.

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Radio aneurysm coils for noninvasive detection of cerebral embolization failures: A preliminary study

Cited by 11 publications

References 32 publications

Inductive antenna stent: design, fabrication and characterization

Inductive antenna stent: design, fabrication and characterization

Fully implantable wireless batteryless vascular electronics with printed soft sensors for multiplex sensing of hemodynamics

Health Care Monitoring and Treatment for Coronary Artery Diseases: Challenges and Issues

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