Nemoto Kyorindo Co., Ltd.

Seiichi Ono

Masahiro Sakakibara

Shigeru Nemoto

Young-Kwang Park

Takanobu Yagi

Tatsuya Ito

Tomoyuki Kawabe

To provide a leak detecting sensor capable of favorably detecting a leak of a chemical liquid regardless of orientation in fixing to a patient. The leak detecting sensor has a plurality of light-emitting elementseach emitting light to be applied to the patient, and a single light-receiving element receiving the light emitted by the plurality of light-emitting elements and reflected by the patient. The plurality of light-emitting elements are placed to surround the single light-receiving element.

Leak detecting sensor and chemical liquid injection system

An apparatus which can detect leak of a liquid injected through an injection needle into a blood vessel of a human body near its surface with high accuracy. The apparatus emits a light ray in a predetermined wavelength band containing a particular wavelength at which the reflectivity for the liquid is lower than the reflectivity for internal tissues of the human body, and detects the light ray in the wavelength band reflected inside the human body. The leak of the liquid can be detected without being affected by variations in the human body or physical condition.

Leak detecting apparatus

A leak detector sequentially emits pulse signals toward a human body at a position at which a needle is inserted, detects pulse signals reflected inside of the human body, and measures a time interval between the emission and the detection for each of the pulse signals. The leak detector then calculates the difference between the measured interval and a predetermined time interval, and generates a leak warning for notification when the difference exceeds an acceptable range. Since a swelling on the surface of the human body causes a path of the pulse signal to extend, the leak detector can detect, based on the extended signal path, that the needle has come off a blood vessel.

Leak detector for detecting leak of liquid injected into blood vessel using pulse signal

A leak detecting apparatus is provided which can detect leak of a liquid injected through an injection needle into a blood vessel of a human body near its surface with high accuracy. The apparatus emits a light ray in a predetermined wavelength band containing a particular wavelength at which the reflectivity for the liquid is lower than the reflectivity for internal tissues of the human body, to the human body at a position thereof where the injection needle is inserted, and detects the light ray in the wavelength band reflected inside the human body. The apparatus measures the average intensity of the detected light ray in the wavelength band and the intensity of the detected light ray at the particular wavelength to determine an occurrence of leak when the ratio of the intensity at the particular wavelength to the measured average intensity in the wavelength band is lower than a predetermined reference value. Variations in human body or physical condition affect the whole of the wavelength band but have no effects on the relative relationships between the wavelength band and the particular wavelength. Thus, the leak of the liquid can be detected without being affected by variations in human body or physical condition.

A chemical liquid injection system which a piston driving mechanism is driven only when a cylinder holding mechanism appropriately holds liquid syringes of various sizes through a cylinder adapter and such manner. When the liquid syringeS of a size other than the maximum size is appropriately held by the cylinder holding mechanism, RFID chipis located on the side at the rear of metallic cylinder holding mechanism. A pair of resonance antennas are disposed on the left and right of the RFID chip, and an RFID readeris disposed below the resonance antennas. When the liquid syringeS is appropriately held by the cylinder holding mechanism, RFID chipwirelessly communicates with RFID readerfavorably, and the piston driving mechanism can be operated only in this state.

Chemical liquid injection system

A medical liquid injection system capable of automatically preventing a piston drive mechanism from being driven when a cylinder holding mechanism does not hold a medical liquid syringe properly. When a cylinder member () is being held, in a specific direction of rotation about the axis of the mechanism, by a cylinder holding mechanism (), an RFID chip () and an RFID reader () become communicable, making the piston drive mechanism operable. On the other hand, when the cylinder member () has been rotated by a specified angle from a specific direction, the RFID chip () and the RFID reader () become incommunicable, not making the piston drive mechanism operable. As a consequence, the piston drive mechanism is not driven when the cylinder holding mechanism () is not holding the medical liquid syringe properly.

A leak detector sequentially emits pulse signals toward a human body at a position at which a needle is inserted, detects pulse signals reflected inside of the human body, and measures a time interval between the emission and the detection for each of the pulse signals. Then, the leak detector calculates the difference between the measured interval and a predetermined time interval, and generates a leak warning for notification when the difference exceeds an acceptable range. Since a swelling on the surface of the human body causes a path of the pulse signal to extend, the leak detector can detect, based on the extended signal path, that the needle has come off a blood vessel.

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Tokyo, Japan

Seiichi Ono