Planar Loop Antenna for Implantable Medical Device Wireless Charging
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Solution Overview
Problem
Current wireless energy transmission technologies for implantable medical devices, such as cardiac pacemakers, face limitations in transmission distance and efficiency, necessitating frequent replacements and causing discomfort to patients.
Innovation Solution
A planar loop antenna system comprising an extracorporal and intracorporal loop antenna with a patch capacitor and radiation patches, designed for wireless energy transmission, enhances magnetic field induction and resonance, improving energy transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional wireless energy transmission technologies (electromagnetic induction, magnetic coupled resonance, capacitive coupling) are used for implantable medical devices, then energy can be transmitted wirelessly, but transmission distance is short and transmission efficiency is low
Solution Approach 1:
The patent divides the loop antenna into multiple segments (first loop radiation patch, second loop radiation patch, third loop radiation patch, fourth loop radiation patch) arranged in a planar configuration. This segmentation allows the antenna to maintain a compact form factor while increasing the effective radiating area, thereby improving energy transmission efficiency without significantly increasing the overall device volume.
Solution Approach 2:
The patent transitions from traditional three-dimensional coil structures to a two-dimensional planar loop antenna configuration. This dimensional change enables the antenna to achieve a larger effective area within a constrained volume, improving both transmission efficiency and allowing for greater flexibility in positioning to optimize transmission distance.
2Duration of action of stationary object
If battery-powered implantable pacemakers are used, then the device can operate independently, but the battery has limited service life requiring frequent replacement surgery
Solution Approach 1:
The patent implements a wireless energy transmission system that allows the implantable pacemaker to be recharged externally through the planar loop antenna. This self-service mechanism eliminates the need for battery replacement surgery by enabling the battery to be recharged in situ through the skin, thereby extending the effective service life of the implantable device without requiring invasive procedures.
3Weight of moving object
If the pacemaker is made small and light using integrated circuits and ultra-small components, then the device is more comfortable for patients, but the battery volume and life become limiting factors
Solution Approach 1:
The patent integrates multiple functions into the planar loop antenna structure, which serves both as the radiating element for wireless energy transmission and as part of the pacemaker housing. This multi-functionality allows the device to maintain a compact and lightweight form factor while providing sufficient power through efficient wireless energy transfer, thereby decoupling the battery size constraints from the overall device performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a high energy transmission efficiency of 59.28% at 403 MHz, enabling prolonged device operation without battery replacement and reducing patient discomfort.
Implementation Method 1
the wireless energy transmission technologies applied to the implantable medical equipment include electromagnetic induction
Implementation Method 2
magnetic coupled resonance
Data Source
AI summary
Provided is a wireless charging loop antenna. The wireless charging loop antenna includes an extracorporal planar loop antenna and an intracorporal planar loop antenna. The intracorporal planar loop antenna is disposed inside a body, and the extracorporal planar loop antenna is disposed on a skin outside the body. The extracorporal planar loop antenna includes an extracorporal antenna substrate, an extracorporal loop radiation patch, paired connection radiation patches and a patch capacitor. The extracorporal loop radiation patch is provided with at least one extracorporal radiation patch gap. The patch capacitor is disposed at one of the at least one extracorporal radiation patch gap. The extracorporal loop radiation patch and the paired connection radiation patches form a circuit. The extracorporal loop radiation patch, the paired connection radiation patches and the patch capacitor are all on a same surface of the extracorporal antenna substrate.