# US 2026/0077205 A1 · Miniaturized magnetoelectric-based wireless bioimplant

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- Number: US 2026/0077205 A1
- Document ID: US20260077205A1
- Status: Published application
- Kind: A1
- Application number: 19/318,270
- Filed: 2025-09-03
- Published: 2026-03-19
- Earliest claimed: 2024-09-13
- Assignees: William Marsh Rice University
- Applicants: William Marsh Rice University
- Inventors: Jacob T. ROBINSON; Fatima Tayseer ALRASHDAN; Joshua E. WOODS
- Web page: https://patentgrep.com/patent/US20260077205A1

## CPC

- A61N 1/3787: {from an external energy source}
- A61N 1/05: for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence)
- A61N 1/08: Arrangements or circuits for monitoring, protecting, controlling or indicating {(for external stimulators A61N1/3603; for implantable neurostimulators A61N1/36128; for heart stimulators A61N1/37; for defibrillators A61N1/3925)}
- A61N 1/37223: {Circuits for electromagnetic coupling}
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)

## Abstract

The present disclosure relates to a magnetoelectric-based wireless bioimplant (MEWB) that can transmit biological activities sensed via a pair of electrodes to an external transceiver by leveraging magnetoelectric (ME) transducer that is coupled to the implant. The MEWB is also capable of wirelessly receiving power and data via the ME transducer from external transceiver when brought closer to the implanted site (e.g., at few centimeters), thus structuring a batteryless and a leadless bioimplant. MEWB may be implanted epidermally through a pair of electrodes on an organ to capture accurate biological activities. The external transceiver may include a transmitter coil for generating an alternating magnetic field and to transmit downlink data and a receiver coil to sense a backscattered field generated by MEWB and to demodulate uplink data. The overall structure of the disclosed implant is adopted enabling compactness, miniaturization (e.g., <3 cm in length and <4 mm in diameter) and endovascular delivery.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

An apparatus of a bioimplant mounted on or in a living body, the apparatus comprising:
a magnetoelectric transducer coupled to an electric circuit through a first pair of electrodes attached across the magnetoelectric transducer, wherein the electric circuit is configured to:
avail power from the magnetoelectric transducer;
send sensor data collected via a second pair of electrodes to an external transceiver; and
receive data from the external transceiver;
a second pair of electrodes attached to the electric circuit, wherein the second pair of electrodes are configured to mount the bioimplant on or in the living body; and
a bias magnet configured to enhance a mechanical strain in the magnetoelectric transducer.

### Claim 8 (depends on 8)

The apparatus of claim 8, further comprising:
a switching circuit configured to modulate the magnetoelectric transducer during an uplink communication such that the switching circuit electrically connects and disconnects a reactive component based on the sensor data.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein the magnetoelectric transducer comprises:
at least one layer of magnetostrictive material configured to be magnetized inducing a mechanical strain when an external magnetic field, is applied;
at least one layer of piezoelectric material on the at least one layer of magnetostrictive material configured to generate an electrical signal in response to the mechanical strain from the at least one layer of magnetostrictive material;
an electrode of the first pair of electrodes attached to an outer surface of the at least one layer of magnetostrictive material; and
an other electrode of the first pair of electrodes attached to an outer surface of the at least one layer of piezoelectric material.

### Claim 10 (depends on 8)

The apparatus of claim 8, further comprising:
a low noise amplifier with a fixed gain configured to generate a consistent response for measuring a strength of a backscattered signal generated by the ME transducer.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the at least one layer of magnetostrictive material comprises Metglas.

### Claim 12 (depends on 10)

The apparatus of claim 10, wherein the at least one layer of piezoelectric material comprises Lead Zirconate Titanate (PZT).

### Claim 13 (depends on 8)

The apparatus of claim 8, wherein the batteryless bioimplant is encapsulated with medical-grade polyurethane epoxy such that the second pair of electrodes are exposed.

### Claim at position 9

14-20. (canceled)

### Claim 21

Wherein the bioimplant is a batteryless bioimplant.