This paper presents an inductive link for wireless power transmission (WPT) to mm-sized free-floating implants (FFIs) distributed in a large three-dimensional space the neural tissue that is insensitive exact location of receiver (Rx). The proposed structure utilizes high-Q resonator on target wirelessly powered plane encompasses randomly positioned multiple FFIs, all by external transmitter (Tx). Based resonant WPT fundamentals, we have devised detailed method optimization FFIs and explored...

A fully-integrated power management ASIC for efficient inductive transmission has been presented capable of automatic load transformation using a method, called Q-modulation. Q-modulation is an adaptive scheme that offers matching against wide range loading (

Next generation implantable neural interfaces are targeting devices with mm-scale form factors that freely floating and completely wireless. Scalability to more recording (or stimulation) channels will be achieved through distributing multiple devices, instead of the current approach uses a single centralized implant wired individual electrodes or arrays. In this way, challenges associated tethers, micromotion, reliability wiring is mitigated. This concept now being applied both central...

This paper presents a feasibility study of wireless power and data transmission through an inductive link to 1-mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> implant, be used as free-floating neural probe, distributed across brain area interest. The proposed structure utilizes four-coil for back telemetry, shared with three-coil transmission. We propose design procedure geometrical optimization the in terms efficiency (PTE)...

This paper introduces an all-soft chemical sensing platform based on liquid metal for detection of liquid-phase and gas-phase VOCs demonstrates battery-free wireless interrogation between a 3D-integrated, LC sensor soft readout coil.

This paper presents a new method, called multicycle Q-modulation,to modulate the quality factor (Q) of receiver (Rx) coil and dynamically optimize load impedance to maximize power transfer efficiency (PTE) in two-coil links. A key advantage proposed method is that it can be easily implemented using off-the-shelf components without requiring fast switching at or above carrier frequency, which more suitable for integrated circuit design. Moreover, technique does not need any sophisticated...

A new class of wireless neural interfaces is under development in the form tens to hundreds mm-sized untethered implants, distributed across target brain region(s). Unlike traditional that are tethered a centralized control unit and suffer from micromotions may damage surrounding tissue, free-floating implantable recording (FF-WINeR) probes will be stand-alone, directly communicating with an external interrogator. Towards FF-WINeR, this paper we describe micromachining, microassembly,...

A 1.1 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> sized free-floating wireless implantable neural recording (FF-WINeR) system-on-a-chip (SOC) is designed and tested in vitro toward developing stand-alone probes the form of small untethered pushpins (1 xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ) to be distributed across areas interest brain. Pre-recorded single unit activity (SUA) from neurons injected saline solution are...

A wide variety of applications can benefit from near-field wireless power transfer using coupled inductive links, such as sensors and implantable microelectronic devices. The use transmission is expected to see an explosive growth over the next decade engineers try cut last cord mobile electronics, small home appliances, even electric vehicles [1]. link efficiency (PTE) highly dependent loading receiver (Rx) coil, referred R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Wireless power transfer enables the frequent and ubiquitous charging of electronic devices. However, variation efficiency received with transmission distance is an outstanding issue. To solve problem degradation magnetic resonance at short distances, zero-phase-difference capacitance control (ZPDCC), which suitable for integration in large scale integrations (LSIs) proposed this paper. The ZPDCC achieves adaptive by a newly algorithm current-sensing circuit to variable capacitors fixed...

Passive resonating wireless sensors consist of a variable capacitive (C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> ) sensing element in resonance with coil (L that is inductively coupled proximal readout circuit. They have been utilized number medical and contactless industrial applications for their simple, small, batteryless, capabilities. An external xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> detects the changes impedance...

For wireless power transfer to multiple millimeter-sized implantable medical devices (IMDs), delivered a load should be over minimum operating of the IMDs and efficiency (PTE) maximized reduce specific absorption rate across wide area interest. We have demonstrated advantages using 3-coil inductive link energize its PTE optimization up bonding-wire wound coils implanted in tissue environment, contrast earlier works that focused on 2-coil methodologies single mm-sized IMD. HFSS simulation...

Wireless implantable drug delivery systems (DDSs) enable targeted, on-demand release to maximize therapeutic efficacy. Ultrasound has been proposed wirelessly power and control millimeter-sized deeply DDSs, but initial demonstrations encountered challenges in transfer reliability dynamic vivo environments. In this work, we present a closed-loop DDS using ultrasound wireless communication conjunction with an electrochemical mechanism. The system consists of piezoelectric transducers for data...

Next generation brain machine interfaces are targeting millimeter-scale implants that freely floating and completely wireless. It is essential these systems achieve good power transmission efficiency but also compatible with microsystem technologies. This paper presents two schemes for implementing mm-scale coils delivery by electromagnetic coupling - on-chip wire-wound. A set of have been fabricated using a 0.35 μm CMOS technology thick top metal option (3 aluminium). These maximum Q-factor...

To understand the complex correlations between neural networks across different regions in brain and their functions at high spatiotemporal resolution, a tool is needed for obtaining long-term single unit activity (SUA) entire area. The concept preliminary design of distributed free-floating wireless implantable recording (FF-WINeR) system are presented, which can enabling SUA acquisition by dispersedly implanting tens to hundreds untethered 1 mm3 probes, floating with operating wirelessly...

Single modality wireless power transfer has limited depth for mm-sized implants across air / tissue or skull interfaces because they either suffer from high loss in (RF, Optical) reflection at the medium interface (Ultrasound (US)). This paper proposes an RF-US relay chip media avoiding boundary, and enabling efficient powering to deep multiple media. The rectifies incoming RF through 85.5% inductive link (across air) using a multi-output regulating rectifier (MORR) with 81% conversion...

This paper presents a new micromachining (MEMS) fabrication, microassembly, and hermetic packaging process for free-floating neural probes (<; 1 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ). It offers an intuitive probe assembly robust design against mechanical material failures. A key component of the pushpin is 1.3×1.3 xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> bath-tub shaped micromachined silicon die, which serves as...

In this paper, we present a new micromachining (MEMS) fabrication process, microassembly, and hermetic packaging of free-floating neural probes (<;1 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ), wrapped with bonding-wire coil for wireless power/data transmission remote monitoring sealing failure. The current prototype probe is pushpin-shaped implantable device consisting mock-up integrated circuit (IC) that also serves as...

In a magnetically resonant wireless power transmission system, DC-DC efficiency (η <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">TOTAL</sub> ) at an inherent frequency (f xmlns:xlink="http://www.w3.org/1999/xlink">RES</sub> is degraded when the distance between transmitter (TX) coil and receiver (RX) short, because dependence of η has two peaks. order to solve degradation, zero phase difference capacitance control (ZPDCC) proposed, which...

This paper presents a new technique, called multicycle Q-modulation, which can be used in wireless power transmission (WPT) to modulate the quality factor (Q) of receiver (Rx) and dynamically match load impedance with that inductive link. A key advantage proposed Q-modulation method is it easily implemented using off-the-shelf management components without requiring any fast switching function at carrier frequency, only feasible integrated circuit implementation. The multi-cycle analyzed...

This paper presents an automated high-throughput hermetic failure monitoring system for millimeter-sized wireless implantable biomedical devices (IMDs). To protect the electronics from harsh body environment as well potential toxic chemicals in package of IMDs, a lifetime estimation IMDs is essential key part IMD design and development. However, traditional leak tests are not suitable small form factor mm-sized IMDs. The presented can enable estimations multiple at low cost user-friendly...

Implantable drug delivery systems can enable targeted, personalized, and on-demand treatments while minimizing the risk of side effects. In this work, we present an ultrasonically powered implantable potentiostat with bidirectional communication for programmable electrochemically controlled delivery. The system consists piezoelectric transducers wireless power data, a 180 nm CMOS integrated circuit, custom module containing drug-loaded electroresponsive nanoparticles. chip includes downlink...

This paper presents an automated hermetic failure monitoring system design for multiple millimeter-sized biomedical implants using inductive link array. 1 × mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> sized passive implants, wrapped with power receiving and data transmitting inductor-capacitor (LC) tank, coated parylene-C polydimethylsiloxane (PDMS) were utilized packaging monitoring, which can result in phase-dip disappearance or...

Abstract Reliability and lifetime estimation of implantable medical devices (IMDs) is one the essential steps in their design development. As any failure IMDs can result serious health risks for patients, they should be guaranteed not to fail over intended under harsh body fluidic chemical environments. Traditional leak tests are applicable large cm‐scale IMDs, often destructive, laborious, costly. This paper presents an automated wireless accelerated heat soak testing system assess hermetic...