頁籤選單縮合
題 名 | Pasteless, Active, Concentric Ring Sensors for Directly Obtained Laplacian Cardiac Electrograms=直取式拉普拉斯心電圖之主動同心圓電極 |
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作 者 | 盧智成; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 22:4 2002.12[民91.12] |
頁 次 | 頁199-203 |
分類號 | 410.1644 |
關鍵詞 | 拉式心電圖; 同心圓電極; 主動式電極; Laplacian ECG; Concentric ring electrodes; Active sensor; |
語 文 | 英文(English) |
中文摘要 | 傳統生理訊號監視若需詳細紀錄心臟每個部位的電生理訊號,必須使用侵入方式。而24小時心電圖機雖然是非侵入式,且可長時間紀錄心電訊號,但仍有無法精確定位心臟每個部位的電訊號。本實驗室已發展出具有高增益和低訊雜比的同心圓電極,它的特性在於能夠準確聚焦量測局部肌肉的動作電位和具有較大增益,就量測心電圖而言,則可準確判別心臟病變部位。電極直徑為1.5和3.6公分,主要由四級放大電路組成,電源由3伏特的鋰電池供應。使用時將多組電極聯至轉接盒,再經由類比/數位轉換卡至筆記型電腦處理擷取到的生理訊號,具極高的可攜性。本實驗室發展之同心圓電極,可聚焦精準量得局部生理訊號,若將多電極作成一陣列,則可改善傳統侵入式量測法和24小時心電圖機的缺點,可以非侵入式且長時間精確監控病人心電訊號。 |
英文摘要 | Abnormal propagation paths and velocities characterize cardiac arrhythmias. Conventional surface ECGs provide only global information and tend to smooth the original signal in time, making it difficult to determine the moment of activation (MoA) at a specific point. We developed an active tripolar concentric ring sensor capable of detecting the Laplacian electrogram (LECG) resolution. The signal conditioning amplifiers and their power supply are mounted directly on the back of the sensor. The uniquely designed instrumentation amplifier (IA) provides high input impedance, therefore skin preparations is not necessary. The inherent common mode rejection (CMR) from the tripolar concentric ring sensor and the high common mode rejection ratio (CMRR=117dB) from the IA yield 0.7μV(subscript rms) noise level at the output with gain of 1000. The Directly Obtained Laplacian Cardiac Electrogram is obtained in real time without digital signal processing. |
本系統中英文摘要資訊取自各篇刊載內容。