主動坐姿感知型之可適性椅墊設計

現今，有許多族群需長時間維持坐姿，例如，電腦族、職業駕駛、與行動不便者。在長期間需保持坐姿時，臀部會被身體重量壓迫而導致各種皮膚損傷或產生血栓。因此，本研究針對需久坐族群提出與設計一套低成本、可攜式、與主動坐姿感知型之可適性椅墊。本系統將將使用者之坐姿壓力與椅面角度資訊透過ZigBee無線感測網路傳輸至控制端進行分析，然後主動調整椅背角度，以減輕使用者的坐姿壓力。首先，本研究應用電阻式壓力感測器來偵測使用者臀部壓力，它具有低成本與體積小等特性。在相同效能量測使用者之平均坐姿壓力與最大坐姿壓力下，和傳統四角形在坐墊上佈建電阻式壓力感應元件方式比較，我們所使用三角形分佈設計能減少12.5%的壓力感應元件數量。更進一步，本系統藉由陀螺儀量測椅墊與椅背角度，並主動監測椅面角度，適時調整角度用來減輕使用者的臀部坐姿壓力。因為本系統可以感知使用的上述資訊後和主動調整椅面，和一般傳統無感坐椅設計比較，本研究可降低臀部壓力達約22.5%。因此，本系統可實際應用於長時間維持坐姿的族群。

關鍵字

主動坐姿感知；可適性椅墊；坐姿壓力；壓力感測器；陀螺儀；椅面傾斜角度椅面與靠背角度

並列摘要

Nowadays, there are some class peoples, whose sitting-posture needs to maintain a fixed position for a long time, such as computing workers, job drivers, and persons to be difficulty walk. During needing to maintain a fixed position for a long time, hip will be oppressed by one’s body such that skin damage and thrombus will be occurred in the case. Therefore, in this study, we propose and design an adaptive cushion with the lower cost, portable and active sitting-posture aware characteristics for those peoples who need to sustainably sit. Our designed system can transmit the information of the sitting-posture pressure, seat tilt angle (STA), and seat to back angle (SBA) to the controller by the ZigBee wireless sensor network. According the information, our system can analyze them and then actively adjust STA and SBA for reducing one’s sitting-posture pressure. First, the resistance type force sensing resistor (Force Sensing Resistor, FSR), which owns low cost and small size characteristics, can be employed for detecting the sitting-posture pressure. Under the same performance to measure the average and maximum sitting-posture pressures, compared with the traditional quadrangle design, the number of FSR of our triangle design to be built within the cushion can be reduced by 12.5%. Moreover, STA and SBA can be detected by the gyroscope in our design. So, our system can actively monitor STA and SBA. In the case, it can properly adjust STA and SBA for reducing one’s sitting-posture pressure. Since our design can sense the above information and then actively adjust STA and SBA, hence, compared with the traditional senseless chair design, our design can reduce one’s hip pressure up to about 22.5%. Therefore, our approach can be applied to those people who need to maintain a fixed position for a long time.

並列關鍵字

Active sitting-posture aware ； Adaptive cushion ； Sitting-posture pressure ； Force sensor ； Gyroscope ； Seat tilt angle ； Seat to back angle

參考文獻

[5] 康錦華、張冠諒、周有禮、吳文哲、戴謙、高文泉，「壓瘡肢動物實驗-介面壓力、組織壓力與壓瘡形成之關係」，慈濟醫學期刊，第四卷，第四期，1992，第231-236頁。

[8] P. V. Geffen, L. Reenalda, P. H. Veltink, and B. F. J. M. Koopman, “The effectof a dynamic tuberal support on ischial buttock load and pattern of blood supply,” IEEE Transactions on neural systems and rehabilitation engineering, Vol. 18, No. 1, pp. 29-37, 2010.

[9] A. Manohar, D. Bhatia, and Electr. Eng. Dept, Univ. of Texas at Dallas, “Pressure detection and wireless interface for patient bed,” IEEE Conference on BioCAS 2008, pp. 389-392, 2008.

[10] X. Jin, B. Cheng, B. Wang, X. Tao, and B. Shen, “Evaluation and prediction of driver comfort using body pressure sensors,” IEEE Conference on ICMTMA 2011, pp. 72-75, 2011.

[11] F. Lin, Z. Crowther, and M. Makhsous, “Reducing whole-body vibration of vehicle drivers with a new sitting concept,” IEEE Conference on IEMBS ’04 26th, pp. 5111-5114, 2004.

國際替代計量

主動坐姿感知型之可適性椅墊設計

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