volume | PIER Journals

Abstract

Wireless power transmission system (WPTS) based on electromagnetic induction is a promising way to power a gastrointestinal capsule robot (CR) for wireless diagnosis, which typically consists of a one-dimensional (1-D) power transmitting coil (PTC) to excite an alternating magnetic field and a three-dimensional (3-D) power receiving coil (PRC) to induce signal. However, it is difficult to apply a 3-D PRC to practical medical applications since the oversize bodily form of the mounting receiver brings the extra challenge of design for microCR. This paper proposes a novel WPTS with space-saving architecture by combining a two-dimensional (2-D) power transmitting coil (PTC) outside the human and 1-D PRC onboard the CR, which can permit CR to accomplish the mission of exploring the intestinal space with wireless energy supplying owing to small size related to 1-D PTC. The analytical expressions of the magnetic flux density, magnetic field orientation, and uniform magnetic field excited by the designed PTC are derived. Simulated and experimental outcomes are implemented to achieve the desired magnetic field strength and direction by changing the transmission current of PTC, which verifies the feasibility and effectiveness of developed methods. And the magnetic field uniformity is greater than 44%. It can basically cover the 20 cm×20 cm area of the human abdomen at all times, which can permit the operational requirements of the CR in the practical case.

1. Mapara, S. S. and V. B. Patravale, "Medical capsule robots: A renaissance for diagnostics, drug delivery and surgical treatment," J. Control Release, Vol. 261, 337-351, Sep. 2017.
doi:10.1016/j.jconrel.2017.07.005

2. Woods, S. P. and T. G. Constandinou, "Wireless capsule endoscope for targeted drug delivery: Mechanics and design considerations," IEEE Trans. Biomed. Eng., Vol. 60, No. 4, 945-953, Apr. 2013.
doi:10.1109/TBME.2012.2228647

3. Guo, S., Q. Yang, L. Bai, and Y. Zhao, "Development of multiple capsule robots in pipe," Micromachines, Vol. 9, No. 6, 259, May 2018.
doi:10.3390/mi9060259

4. Jia, Z., G. Yan, H. Liu, Z. Wang, P. Jiang, and Y. Shi, "The optimization of wireless power transmission: Design and realization," Int. J. Med. Robot, Vol. 8, No. 3, 337-347, Sep. 2012.
doi:10.1002/rcs.1428

5. Basar, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "Stable and high-efficiency wireless power transfer system for robotic capsule using a modified helmholtz coil," IEEE Transactions on Industrial Electronics, Vol. 64, No. 2, 1113-1122, Sep. 2016.
doi:10.1109/TIE.2016.2614268

6. Ciuti, G., A. Menciassi, and P. Dario, "Capsule endoscopy: From current achievements to open challenges," IEEE Reviews in Biomedical Engineering, Vol. 4, 59-72, 2011.
doi:10.1109/RBME.2011.2171182

7. Jia, Z., G. Yan, P. P. Jiang, Z. Wang, and H. Liu, "Efficiency optimization of wireless power transmission systems for active capsule endoscopes," Physiol. Meas., Vol. 32, No. 10, 1561-1573, Oct. 2011.

8. Basar, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "Application of wireless power transmission systems in wireless capsule endoscopy: An overview," Sensors, Vol. 14, No. 6, Art. No. 6, Jun. 2014.

9. Basar, Md. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "An improved wearable resonant wireless power transfer system for biomedical capsule endoscope," IEEE Transactions on Industrial Electronics, Vol. 65, No. 10, 7772-7781, 2018.
doi:10.1109/TIE.2018.2801781

10. Baser, M. R., M. Y. Ahmad, J. Cho, and F. Ibrahim, "An improved resonant wireless power transfer system with optimum coil configuration for capsule endoscopy," Sensors and Actuators A: Physical, Vol. 249, 207-216, 2016.
doi:10.1016/j.sna.2016.08.035

11. Gao, J., G. Yan, Y. Shi, H. Cao, K. Huang, H. Gao, and J. Liu, "Analysis of connection way of a three-dimensional receiving coil onboard a capsule robot for wireless power transmission," Progress In Electromagnetics Research M, Vol. 78, 39-48, 2019.

12. Ke, Q., W. Luo, G. Yan, and K. Yang, "Analytical model and optimized design of power transmitting coil for inductively coupled endoscope robot," IEEE Transactions on Biomedical Engineering, Vol. 63, No. 4, 694-706, Apr. 2016.
doi:10.1109/TBME.2015.2469137

13. Carta, R., J. Thoné, and R. Puers, "A wireless power supply system for robotic capsular endoscopes," Sensors and Actuators A: Physical, Vol. 162, 177-183, Aug. 2010.
doi:10.1016/j.sna.2009.12.025

14. Zhang, Z., C. Yuan, J. Gao, C. Gao, and J. Zhou, "Comparison of the uniformity and efficiency of the square and circular helmholtz coils for wireless power transmission system," Progress In Electromagnetics Research Letters, Vol. 97, 131-139, 2021.
doi:10.2528/PIERL21032203

15. Helander, H. F. and L. Fändriks, "Surface area of the digestive tract --- Revisited," Scand. J. Gastroenterol., Vol. 49, No. 6, 681-689, Jun. 2014.
doi:10.3109/00365521.2014.898326

16. Kopparthi, S. and P. Ajmera, "Power delivery for remotely located microsystems,", 31-39, May 2004.

17. Monson, J. R. T., et al. "Practice parameters for the management of rectal cancer (revised)," Dis. Colon. Rectum, Vol. 56, No. 5, 535-550, May 2013.
doi:10.1097/DCR.0b013e31828cb66c

18. Lenaerts, B. and R. Puers, "Inductive powering of a freely moving system," Sensors and Actuators A: Physical, Vol. 123-124, 522-530, Sep. 2005.
doi:10.1016/j.sna.2005.01.033

19. Gao, J., G. Yan, Z. Wang, P. Jiang, and D. Liu, "A capsule robot powered by wireless power transmission: Design of its receiving coil," Sensors and Actuators A: Physical, Vol. 234, 133-142, Oct. 2015.

Dr. Chen Gao

Professor Jinyang Gao

Dr. Changshun Yuan

Dr. Jinshan Zhou

Dr. Siyu Tian

Dr. Peng Huang