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Ogawa H.,Hiroshima Institute of Technology | Yonezawa Y.,Hiroshima Institute of Technology | Maki H.,Hiroshima Institute of Technology | Hahn A.W.,University of Missouri | Caldwell W.M.,Caldwell Biomedical Electronics
Biomedical Sciences Instrumentation | Year: 2010

A new drip infusion solution monitoring system has been developed for hospital and care facility use. The system detects and counts the fall of each drip chamber drop of fluid. Two non-contacting copper foil electrodes are used; one wrapped around the infusion supply polyvinyl-chloride tube under the solution bag and another around the drip chamber, forming two capacitors. Drip infusion fluids have electrical conductivity, so the capacitors are a series-connected electrical impedance. A thirty kHz sine wave is applied to the infusion tube electrode and the capacity-coupled signal on the drip chamber electrode is the transducer output. When an infusion fluid drop is forming, its diameter, and therefore drip chamber capacitance, are increasing, causing change in the output signal. When the drop reaches sufficient diameter to fall, the drip chamber capacitance decreases, which briefly returns the output signal to baseline. Therefore, the growth, fall, and drip rate of each drop of fluid can be detected from the output signal waveform. The system also has advantages of being insensitive to ambient light type and intensity, and detects when the infusion bag is empty. Copyright 2010 ISA. All Rights Reserved.


Maki H.,Hiroshima Institute of Technology | Yonezawa Y.,Hiroshima Institute of Technology | Ogawa H.,Hiroshima Institute of Technology | Hahn A.W.,University of Missouri | Caldwell W.M.,Caldwell Biomedical Electronics
Biomedical Sciences Instrumentation | Year: 2010

We have developed a non-intrusive safety monitoring system which can measure respiration and body movements of solitary-living elderly people while they are in their home bathroom. These physiological variables are monitored with a 40 kHz ultrasonic transmitter and four receivers. The ultrasonic transmitter diffuses an ultrasonic wave throughout the room. The diffusion pattern of this inaudible sonic energy is changed by body movements and respiration, therefore modulating the amplitude of the received ultrasonic signal. The received ultrasonic signals are demodulated by envelope detection circuits. Band-pass filters detect respirations and body movements from the envelope detection circuit outputs. These detected signals are added and used to monitor whether the elderly person is safe or not safe, while in their bathroom. When the microcomputer cannot detect body movement or respiration, it alerts the person's caregiver, via a low power personal handy phone system. Copyright 2010 ISA. All Rights Reserved.


Matsuoka S.,International Trinity College | Ogawa H.,Hiroshima Institute of Technology | Maki H.,Hiroshima Institute of Technology | Yonezawa Y.,Hiroshima Institute of Technology | Caldwell W.M.,Caldwell Biomedical Electronics
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS | Year: 2011

We have developed a new mobile phone-based safety support system for transmitting information of a wandering elderly person's location and the environmental sounds around that person. The system consists of a wearable sensor and a conventional desktop PC with Internet access acting as the server computer. The wearable sensor, which is attached behind the neck of the elderly person's shirt, is composed of a low transmitting power mobile phone (W-SIM), a small microphone and a one chip microcontroller. The wandering elderly person's location is identified within 100 m from the mobile phone company's antenna ID via the W-SIM. The caregiver sets the elderly person's movement area by specialized computer software. When the elderly person goes out of the area, the sensor automatically records the environmental sound around the wandering elderly person for the presumption of the person's situation with the small microphone. The W-SIM sends both the wandering elderly person's location and the environmental sound to the server computer. The server computer informs automatically the caregiver by the e-mail. The caregiver can monitor the sound and the map of the wandering person's location via Internet. The sound enables the presumption of an accurate location and the situation of the wandering elderly person. © 2011 IEEE.


Amano H.,Hiroshima Institute of Technology | Ogawa H.,Hiroshima Institute of Technology | Maki H.,Hiroshima Institute of Technology | Tsukamoto S.,Hiroshima Institute of Technology | And 2 more authors.
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS | Year: 2012

We have developed a remote drip infusion monitoring system for use in hospitals. The system consists of several infusion monitoring devices and a central monitor. The infusion monitoring device employing a Bluetooth module can detect the drip infusion rate and an empty infusion solution bag, and then these data are sent to the central monitor placed at the nurses' station via the Bluetooth. The central monitor receives the data from several infusion monitoring devices and then displays graphically them. Therefore, the developed system can monitor intensively the drip infusion situation of the several patients at the nurses' station. © 2012 IEEE.


Maki H.,Hiroshima Institute of Technology | Ogawa H.,Hiroshima Institute of Technology | Yonezawa Y.,Hiroshima Institute of Technology | Hahn A.W.,University of Missouri | Caldwell W.M.,Caldwell Biomedical Electronics
51st Annual Rocky Mountain Bioengineering Symposium, RMBS 2014 and 51st International ISA Biomedical Sciences Instrumentation Symposium 2014 | Year: 2014

We have developed an ultrasonic stride length measuring system for analyzing the human gait. All elements of the system are quite small and each fit into an appropriate package. An ultrasonic transmitter, a digital compass, a radio transmitter and a microcontroller are attached to the subject's heel on the right shoe and in the direction of the left shoe. Two ultrasonic receivers, a digital compass, a radio receiver, a microcontroller and a 1GB SD memory card are installed on the left shoe. The ultrasonic receivers are attached to the toe and heel in the direction of the right shoe. The walking direction is thus detected by the compass attached on the right and left shoes, respectively. The stride length is detected by the difference between the radio wave and ultrasonic propagation velocities. The stride length is corrected by the detected walking direction, and then the corrected stride length is stored in the SD memory card. When downloaded, the memory card gives the accurate stride length which then is used to characterize the subject's gait during daily activity .

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