發(fā)布時(shí)間：2018-03-19 08:30

  本文選題：電外科　切入點(diǎn)：血管閉合　出處：《生物醫(yī)學(xué)工程研究》2017年01期 　論文類(lèi)型：期刊論文

【摘要】：為進(jìn)一步豐富血管組織熱物性參數(shù)數(shù)據(jù),以降低雙極電外科血管閉合手術(shù)中高頻電流產(chǎn)生的熱量對(duì)手術(shù)裝置加熱點(diǎn)臨近組織的熱損傷,本研究基于準(zhǔn)穩(wěn)態(tài)平板法實(shí)驗(yàn)原理,采用電熱膜和微型NTC熱敏電阻分別作為加熱元件和測(cè)溫元件搭建實(shí)驗(yàn)裝置;然后以家豬離體主動(dòng)脈為研究對(duì)象,利用給電熱膜通電加熱組織、熱敏電阻采集其溫度數(shù)據(jù),通過(guò)實(shí)驗(yàn)得到其熱傳導(dǎo)率數(shù)據(jù);最后對(duì)比了血管組織熱傳導(dǎo)率和生物組織阻抗隨溫度變化特性。研究結(jié)果顯示離體家豬胸主動(dòng)脈在26.5℃時(shí),熱傳導(dǎo)率為0.4150 W/m-K。在溫度升高至63℃時(shí)之前,熱傳導(dǎo)率增加隨溫度升高變化不明顯;當(dāng)溫度高于63℃之后,熱傳導(dǎo)率呈下降趨勢(shì);當(dāng)溫度高于79℃后,隨溫度的上升,因組織內(nèi)含水量持續(xù)減少,血管組織熱傳導(dǎo)率隨溫度升高而快速下降,溫度接近90℃時(shí),熱傳導(dǎo)率下降到0.201 W/m-K。研究發(fā)現(xiàn)家豬主動(dòng)脈熱傳導(dǎo)率的變化特性與生物組織阻抗隨溫度變化特性在溫度區(qū)間非常吻合,表明組織熱傳導(dǎo)率和阻抗特性存在一定相關(guān)性,為深入揭示電外科手術(shù)過(guò)程中生物傳熱機(jī)理提供重要參考。
[Abstract]:In order to further enrich the data of thermo-physical properties of vascular tissue and reduce the heat damage caused by high frequency current in bipolar electrosurgical vascular closure surgery, this study is based on the principle of quasi-steady-state plate method. The electric heating film and the micro NTC thermistor were used as heating element and temperature measuring element respectively, and then the isolated aorta of domestic pig was taken as the research object, the tissue was heated by electric heating film, and the temperature data were collected by thermistor. The thermal conductivity data were obtained by experiments. Finally, the thermal conductivity of vascular tissue and the variation of biological tissue impedance with temperature were compared. The results showed that the isolated thoracic aorta of domestic pigs was at 26.5 鈩，

本文編號(hào)：1633465