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Flow Rate Measurement of Gravity Infusion Set and Functional Evaluation of Drop Counter: A Pilot Study

Journal of Biomedical Science and Engineering 2024年第7期17卷 129-135页

作者： Rina Sakai shuichi tanaka Kaya Murakami Tomomi Mizuhashi Kazuhiro Yoshida Masanobu Ujihira Department of Medical Engineering and Technology Kitasato University School of Allied Health Sciences Sagamihara Japan Faculty of Medical Engineering Gunma University of Health and Welfare Maebashi Japan Kitasato University Graduate School of Medical Sciences Sagamihara Japan

Developing a novel drop counter by introducing the Internet of Things concept has been vigorously conducted in recent years. Understanding the newly introduced drop counter’s flow rate control accuracy and flow rate count feature is essential for improving safety in infusion management. This study aimed to verify if the new drop counters could secure accurate flow rate and drip count by conducting actual flow rate measurements using gravimetry and functional evaluation. A drop counter was attached to each drip chamber of the infusion set, and an IV drip was conducted at the 100 ml/h flow rate. The weight of discharged physiological saline was measured to plot trumpet curves. Next, three different types of drop counters were evaluated to determine if they maintained drip count accuracy according to the changes in their position angles. The flow rate errors in all conditions indicated trumpet-like curves, exhibiting an overall error range within ±10% in all observation windows. Although every drop counter successfully detected and measured dripping, it was challenging in some counters to detect dripping when the drip chamber was tilted. In comparing adult and pediatric IV sets, the adult IV set was found to be less likely to detect dripping in the angled position. No significant differences in results were confirmed between high and low flow rates, suggesting that the drop count function would not be affected by the flow rate in the ranges of typical infusion practices. Doppler sensors have a wide range of measurements and high sensitivity;the dripping was detected successfully even when the drip chamber was tilted, probably due to the advantages of these sensors. In contrast, miscounts occurred in those equipped with infrared sensors, which could not detect light intensity changes in tilted positions. Understanding the tendencies in flow rate errors in infusion can be valuable information for infusion management.

关键词： Gravity Infusion Set Drop Counter IV Fluids Flow Rate Trumpet Curves

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Flow Rate Measurement of Gravity Infusion Set and Functional Evaluation of Drop Counter: A Pilot Study

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Journal of Biomedical Science and Engineering（生物医学工程） 2024年第7期 129页

作者： Rina Sakai shuichi tanaka Kaya Murakami Tomomi Mizuhashi Kazuhiro Yoshida Masanobu Ujihira

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Which characteristics are associated with changes in medication status for lower urinary tract symptoms among patients with prostate cancer receiving external beam radiotherapy?

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CURRENT UROLOGY 2024年第2期18卷 122-127页

作者： Kyoda, Yuki Hashimoto, Kohei Takahashi, Atsushi Maehana, Takeshi Tachikawa, Kimihito Muranaka, Takashi Kato, shuichi Kurisu, Tomoyo Fukuta, Fumimasa Kirisawa, Takahiro Okada, Manabu Kobayashi, Ko tanaka, Toshiaki Hinotsu, Shiro Masumori, Naoya Sapporo Med Univ Sch Med Dept Urol S-1W-16Chuo Ku Sapporo 0608543 Japan Hakodate Goryoukaku Hosp Dept Urol Hakodate Japan Muroran City Gen Hosp Dept Urol Muroran Japan NTT East Sapporo Hosp Dept Urol Sapporo Japan Sunagawa City Med Ctr Dept Urol Sunagawa Japan Oji Gen Hosp Dept Urol Tomakomai Japan Steel Mem Muroran Hosp Dept Urol Muroran Japan Obihiro Kyokai Hosp Dept Urol Obihiro Japan Sapporo Med Univ Sch Med Dept Med Stat Sapporo Japan

BackgroundWe clarified the predictive factors for changes in the status of medications for lower urinary tract symptoms (LUTS) 2 years after local radiotherapy for nonmetastatic prostate cancer. Materials and methodsWe retrospectively included patients who underwent local external radiotherapy for nonmetastatic prostate cancer in 8 institutions between April 2001 and March 2016. Patients were divided into the medication and no-medication group based on the use of drugs for LUTS before radiotherapy. We defined improvement of LUTS as when the patient did not require medication for LUTS at 24 months after radiotherapy in the medication group and as deterioration when medication was required in the no-medication group. Logistic regression analysis was used to evaluate predictive factors for changes in medication status. ResultsAltogether, 505 patients were divided into a no-medication group (n = 352) and a medication group (n = 153). The number of patients with deterioration and improvement in LUTS was 49 (14%) and 36 (23%), respectively. In the multivariate analysis, the predictive variables for deterioration were the International Prostate Symptom Score (>= 8; odds ratio [OR], 2.21; p = 0.014) and the biopsy Gleason score (= 50%; OR, 2.530; p = 0.027) in the medication group. ConclusionsThese predictive factors for changes in the status of medications for LUTS at 2 years after external radiotherapy may help determine the definitive therapy for nonmetastatic prostate cancer.

关键词： Prostate cancer Radiotherapy Lower urinary tract symptoms Medications ANDROGEN DEPRIVATION THERAPY QUALITY-OF-LIFE RADIATION VOLUME MEN TOXICITY RELIEF

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Metallic Contaminant Detection using a High-Temperature Superconducting Quantum Interference Devices Gradiometer

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Chinese Physics Letters 2010年第8期27卷 253-255页

作者： Saburo tanaka Tomohiro Akai Makoto Takemoto Yoshimi Hatsukade Takeyoshi Ohtani Yoshio Ikeda shuichi Suzuki Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi Aichi 441-8580 Japan Advance Food Technology Co. Ltd. Toyohashi Aichi 441-8113 Japan

We develop magnetic metallic contaminant detectors using high-temperature superconducting quantum interference devices （HTS-SQUIDs） for industrial products. Finding ultra-small metallic contaminants is an important issue for manufacturers producing commercial products such as lithium ion batteries. If such contaminants cause damages, the manufacturer of the product suffers a big financial loss due to having to recall the faulty products. Previously, we described a system for finding such ultra-smafi particles in food. In this study, we describe further developments of the system, for the reduction of the effect of the remnant field of the products, and we test the parallel magnetization of the products to generate the remnant field only at both ends of the products. In addition, we use an SQUID gradiometer in place of the magnetometer to reduce the edge effect by measuring the magnetic field gradient. We test the performances of the system and find that tiny iron particles as small as 50 × 50 μm^2 on the electrode of a lithium ion battery could be clearly detected. This detection level is difficult to achieve when using other methods.

关键词： HIGH temperature superconductors SUPERCONDUCTING quantum interference devices PHYSICAL measurements INDUSTRIAL goods LITHIUM-ion batteries MAGNETIZATION PERFORMANCE evaluation

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