植入式醫(yī)療設(shè)備無線能量傳輸系統(tǒng)電磁環(huán)境下的人體安全性研究
發(fā)布時(shí)間：2019-01-17 19:34
【摘要】：隨著科技的發(fā)展,各類電磁設(shè)備產(chǎn)生的電磁輻射對(duì)人體安全的影響逐漸引起國內(nèi)以及國際的普遍重視。人體在不同頻率的高強(qiáng)度電磁輻射環(huán)境下會(huì)產(chǎn)生不同的病狀,受到電磁輻射少可造成身體發(fā)熱、神經(jīng)疼痛,受到電磁輻射多可導(dǎo)致神經(jīng)錯(cuò)亂、心臟衰竭、灼傷乃至致死。由于目前人體植入式醫(yī)療設(shè)備電源電量的有限性,對(duì)于將無線傳能系統(tǒng)應(yīng)用于人體植入式醫(yī)療設(shè)備進(jìn)行無線能量補(bǔ)給的研究越來越多,因此人體在無線傳能過程中系統(tǒng)產(chǎn)生的電磁輻射環(huán)境下的安全性研究就顯得極為重要。 為此,本文針對(duì)人體與植入式醫(yī)療設(shè)備無線能量傳輸系統(tǒng)電磁環(huán)境之間的相互作用原理和電磁仿真方法進(jìn)行了比較詳細(xì)地分析研究,主要的研究工作和創(chuàng)新點(diǎn)總結(jié)是： 1.在介紹生物電磁學(xué)及生物電磁劑量學(xué)基本知識(shí)的基礎(chǔ)上,對(duì)時(shí)域有限差分法的基本原理和要點(diǎn)作了歸納。 2.提出了一種融入等效寬度技術(shù)的非均勻網(wǎng)格生成算法,在網(wǎng)格剖分軟件中設(shè)置△Xmin,△Ymin,△Zmin以及RX, Ry, RZ,若沿x軸縮小模型尺寸,△Xmin可以在符合數(shù)值色散公式的基礎(chǔ)上設(shè)置的大一點(diǎn)進(jìn)行粗網(wǎng)格剖分；由于非均勻網(wǎng)格剖分方法網(wǎng)格尺寸在x,y,z方向上是不斷變化的,因此在獲得實(shí)際模型的等效尺寸時(shí),需要求得劃分為粗網(wǎng)格方向的網(wǎng)格單元尺寸的平均值,即該方向上的模型尺寸與網(wǎng)格數(shù)的比值,通過此平均值將計(jì)算模型的尺寸在相應(yīng)方向減小半個(gè)網(wǎng)格,得到等效尺寸模型；重復(fù)第一個(gè)步驟,進(jìn)行網(wǎng)格剖分。通過實(shí)驗(yàn)驗(yàn)證,說明了融入等效寬度技術(shù)的非均勻網(wǎng)格剖分算法在FDTD仿真時(shí)的準(zhǔn)確性和有效性。 3.將融入等效寬度技術(shù)的非均勻網(wǎng)格生成算法應(yīng)用于植入式醫(yī)療設(shè)備無線能量傳輸系統(tǒng)電磁環(huán)境下人體頭部和人體比吸收率SAR計(jì)算當(dāng)中,研究無線傳能系統(tǒng)諧振天線位于人體不同部位時(shí)的SAR分布情況,然后將求解結(jié)果與現(xiàn)今的國際國內(nèi)衛(wèi)生標(biāo)準(zhǔn)進(jìn)行了比較。
[Abstract]:With the development of science and technology, the influence of electromagnetic radiation produced by various kinds of electromagnetic equipment on human safety has been paid more and more attention both at home and abroad. The human body under different frequency of high intensity electromagnetic radiation environment will produce different symptoms, less electromagnetic radiation can cause body fever, nerve pain, electromagnetic radiation can lead to nervous disorder, heart failure, burns and even death. Due to the limitation of power supply of implanted medical devices, more and more researches have been made on wireless energy supply for implantable medical devices. Therefore, it is very important to study the safety of human body in the electromagnetic radiation environment. Therefore, the interaction principle and electromagnetic simulation method between human body and implanted medical device wireless energy transmission system are analyzed in detail in this paper. The main research work and innovation are summarized as follows: 1. Based on the introduction of the basic knowledge of bioelectromagnetics and bioelectromagnetic dosimetry, the basic principles and main points of the FDTD method are summarized. 2. In this paper, a non-uniform mesh generation algorithm with equivalent width technique is proposed. Xmin, Ymin, Zmin and RX, Ry, RZ, are used to reduce the size of the model along the x axis in the mesh generation software. Xmin can be used for coarse mesh generation on the basis of a large point set on the basis of the numerical dispersion formula. Since the mesh size of the non-uniform mesh generation method is constantly changing in the direction of xyniz, it is necessary to obtain the mean value of the size of the mesh element divided into coarse grid directions when obtaining the equivalent size of the actual model. That is, the ratio of the model size to the mesh number in this direction, the size of the model is reduced by half a mesh in the corresponding direction through this average value, and the equivalent size model is obtained. Repeat the first step for mesh generation. Experimental results show the accuracy and effectiveness of the non-uniform mesh generation algorithm with equivalent width technique in FDTD simulation. 3. A non-uniform mesh generation algorithm incorporating the equivalent width technique is applied to the SAR calculation of the head and the specific absorption rate of the human body under the electromagnetic environment of the wireless energy transmission system of implanted medical equipment. The SAR distribution of the resonant antenna in different parts of the human body is studied, and the results are compared with the current domestic and international health standards.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM724
本文編號(hào)：2410309
[Abstract]:With the development of science and technology, the influence of electromagnetic radiation produced by various kinds of electromagnetic equipment on human safety has been paid more and more attention both at home and abroad. The human body under different frequency of high intensity electromagnetic radiation environment will produce different symptoms, less electromagnetic radiation can cause body fever, nerve pain, electromagnetic radiation can lead to nervous disorder, heart failure, burns and even death. Due to the limitation of power supply of implanted medical devices, more and more researches have been made on wireless energy supply for implantable medical devices. Therefore, it is very important to study the safety of human body in the electromagnetic radiation environment. Therefore, the interaction principle and electromagnetic simulation method between human body and implanted medical device wireless energy transmission system are analyzed in detail in this paper. The main research work and innovation are summarized as follows: 1. Based on the introduction of the basic knowledge of bioelectromagnetics and bioelectromagnetic dosimetry, the basic principles and main points of the FDTD method are summarized. 2. In this paper, a non-uniform mesh generation algorithm with equivalent width technique is proposed. Xmin, Ymin, Zmin and RX, Ry, RZ, are used to reduce the size of the model along the x axis in the mesh generation software. Xmin can be used for coarse mesh generation on the basis of a large point set on the basis of the numerical dispersion formula. Since the mesh size of the non-uniform mesh generation method is constantly changing in the direction of xyniz, it is necessary to obtain the mean value of the size of the mesh element divided into coarse grid directions when obtaining the equivalent size of the actual model. That is, the ratio of the model size to the mesh number in this direction, the size of the model is reduced by half a mesh in the corresponding direction through this average value, and the equivalent size model is obtained. Repeat the first step for mesh generation. Experimental results show the accuracy and effectiveness of the non-uniform mesh generation algorithm with equivalent width technique in FDTD simulation. 3. A non-uniform mesh generation algorithm incorporating the equivalent width technique is applied to the SAR calculation of the head and the specific absorption rate of the human body under the electromagnetic environment of the wireless energy transmission system of implanted medical equipment. The SAR distribution of the resonant antenna in different parts of the human body is studied, and the results are compared with the current domestic and international health standards.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM724
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