Integrated Bidirectional Inductive-Array Design for Power Transfer in Implantable BioMEMS

Abstract

This work presents a novel design of a bidirectional Inductive Power Transfer (IPT) system capable of continuous monitoring of cardiac pressure. The proposed system results from a robust electromagnetic coupling between an external reading coil and an implanted two-level (3D approach) inductor array. In this design, each coupling module follows a 13.56 MHz operating frequency, where both passive RCL networks are near field tuned. Among our main results, we obtained a Power Transfer Efficiency (PTE) of 94.1% across the 3.5 cm-thick composed biological tissue whereas the implanted coil array is about 50% of its conventional size. Since the resulting PTE efficiency is 40% higher, based on the optimized L and Q parameters, this novel approach could be used in other medical applications. This IPT system design is based on a low-cost thin film fabrication technology.

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

“…A cost-effective thin-film technique for micromachining surfaces was integrated with electronics comprising a round coil-capacitor array made using flexible electronics to meet the greater than 40% transfer efficiency value for a given tissue thickness of 3.5 cm. The proposed design was able to continuously monitor cardiac pressure across the 5–300 torr range [ 36 ]. Figure 2 illustrates the kinds of pressure sensors using circular and planar coils as antennae and incorporated with MEMS capacitance.…”

“…Reproduced with permission [ 35 ], copyright 2020, Elsevier; ( E ) scheme showing the inductive coupling across the biological tissue. Reproduced with permission [ 36 ], Sensors Open Access; ( F ) fabricated wireless pressure sensor with SEM cross sectional view of the wireless pressure sensor fabricated using a SU-8 thermal pressure bonding technique. Reproduced with permission [ 34 ], copyright 2020, Elsevier.…”

Planar antenna design for contactless energizing applications: resonance analysis

“…This issue has considerable limitations and is due to the morphological characteristics of each living being (Fang, Hou, Zhou & Zhang, 2018). A particular case is the monitoring of ventricular pressure with a maximum dimension of 1.8 cm 2 as mentioned by (Hernández-Sebastián, Renero-Carrillo, Díaz-Alonso & Calleja-Arriaga, 2019). The importance of a study to energize a medical device small enough is relevant, to treat degenerative diseases, such as diabetes, arterial hypertension, cancer, eye diseases, or other pathologies that must always be controlled by the patient.…”

“…The objective of this study is to find the most appropriate way to measure the absorption of a flat receiver coil, which is intended to determine the appropriate geometry for wireless transmission between two coils. The first studies focused on wirelessly measuring the pressure of the eyeball (Hernández-Sebastián et al, 2019;Hernández, 2020;Rendon-Nava et al, 2014) through an impedance bridge in the transmitting coil, whereas Rendon-Nava et al (2014) proposed a variable capacitor inserted in the anterior chamber of the eyeball and connected in series to the receiving coil to measure of intraocular pressure. Natiely describes the propagation of magnetic fields of circular flat coils for inductive power transfer (IPT) in tissues whose proposed working frequency is 13.56 Mhz with a separation of 3.5 cm, another relevant study was performed by Ongayo, et al (2015), in this study proposes an aluminum foil behind the coils to contain the inductive link.…”