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標題: | 椎間核壓力感測器之製程研究 Study of Manufacturing of Miniature Intradiscal Pressure Transducers |
作者: | Chi-Hsuan Huang 黃啟軒 |
指導教授: | 王兆麟 |
關鍵字: | 椎間核壓力,壓力量測,針型壓力感測器,標準製程, Intradiscal pressure,Pressure measurement,Needle transducer,Standard procedure, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 簡介:椎間核壓力是脊椎生物力學研究上一重要的參數,透過椎間核壓力的量測,可以探討椎間盤的生物力學性質,而目前最主要的量測方式是用針型壓力感測器,穿刺椎間環來量測內部的椎間核壓力。目前雖已經成功開發出20 G(外徑0.9 mm)的針型感測器,但在製程上仍處於一個不穩定的階段,其中含失敗率高、靈敏度及非線性度不易控制等因素,而且也沒統一的標準來判斷其優劣,所以希望能在製程上做一探討,整理出一套有系統的標準製程。
材料與方法:首先會在20 G針頭上放電加工一凹槽,然後將應變規以應變規黏著劑平貼於凹槽內,在確定熱熔膠槍溫度上升至133℃後,以自製之夾具對熱熔膠做定量之出膠,以及應變規塗佈表面做定位之控制,最後以熱風槍做定時、定向的吹整,來達到製程的標準化;校正方面以靜脈帽之構造,設計一特殊結構將感測器密封於液壓裝置中,並使用材料測試機來做外力負載,而液壓裝置內部接有一標準壓力感測器,即可將此接受之訊號與針型感測器之訊號做校正分析。所校正出來的數值,會先以非線性度做一篩選,從其中選出小於10%的良品,再做0.5小時之0.4~0.7 MPa的連續負載,最後再篩選一次,將非線性度大於10%與負載前後校正常數差異大於10%的剃除,最後留下的即為成品。 結果:本研究比較了標準製程與手工製程的差異,在樣本數為標準製程及手工製程各25支的情況下,標準製程良率為72%,手工製程為24%;標準製程之校正常數標準差較手工製程為低,且根據以往經驗,標準製程的校正常數更能趨向其最適用值20 bar/V;另外標準製程所做出的成品相較於手工製程有較低的非線性度,顯示標準製程比起手工製程在製作上更能提供穩定且實用的方法。另外本研究也成功將應變規感測器尺寸縮小至22 G針頭,壓力測量範圍提升至3 MPa。 結論:本研究開發之新標準製程能改良過去手工製作之針型壓力感測器的靈敏度、非線性度及重複性。 Introduction: Needle-type transducers are widely used in measuring the intradiscal pressure (IDP). The manufacturing procedures of in-house miniature needle-type transducer (20G) are not well established, resulting in the poor yielding rate and large variances of sensitivity and nonlinearity. The yielding rate of transducer also needs to be improved. In order to tackle these problems, the aim of this study is to develop a standard protocol of miniature needle-type IDP transducer manufacturing. Material and method: We designed a standard procedure for transducer manufacturing. At first, the strain gage was attached to a fillister in a 20G needle with gage-specific glue. The fillister was created with a method of electric discharge. The surface of the strain gage was covered by a layer of melted adhesive at 133℃. The amount of adhesive was quantified by a self-designed device. The flatness of adhesive surface was control by fixing the air-blow direction and using time of a heat gun. Then the transducer was sealed in a hydraulic device for calibration. Only the transducers with non-linearity less than 10% were selected for the next-step sustainability test. The sustainability test included a 30 min cyclic loading with the loading magnitude ranging from 0.4~0.7 MPa. After that the transducer was calibrated again. The screening criteria for the sustainability test of the transducer were 1) the nonlinearity <10% and 2) the changing ratio of the calibration coefficients <10%. Result: This study compared the performances of needle transducers manufactured through standard protocol and manual protocol. Accordingly, fifty transducers were produced. A half of them were manufactured by the standard procedures (i.e. Standard group, n=25), while the other half was vice the versa (i.e. Manual group, n=25). The yielding rate was 72% for the standard group and 24% for the manual group. The average calibration coefficient of the standard group approached 20 bar / volt, which indicated proper sensitivity for IDP measurement. Compared to the manual group, the nonlinearity and standard deviation of calibration coefficient of the transducer were lower in the standard group. Conclusion: The standardization of manufacturing procedures improves the stability and robustness of the miniature IDP transducers which shows better nonlinearity, sensitivity and reproducibility. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/9991 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 醫學工程學研究所 |
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