JPS58200734A - Wireless through-skin blood gas sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to wireless transcutaneous blood gas sensors.

Conventionally, transcutaneous blood gas sensors that transcutaneously measure gas concentrations or PH in blood consist of a sensor body that is attached to a patient (subject) and a monitor body that processes measurement signals from the sensor. Because of the connection, the monitor body is inevitably placed near the patient, which not only hinders the movement of people around the patient, but also has the drawback of easily causing a breakage accident of the lead wire. Further, when the sensor body and the monitor body are connected by a single lead wire in this way, there is a drawback that the lead wire gets in the way when the patient is being moved for treatment, making it difficult to move the patient.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and for this reason, the present invention provides a transcutaneous blood gas sensor that includes:
A measuring section that percutaneously measures blood gas concentration or PH in the sensor body, a processing and transmitting circuit that processes and transmits the measurement signal from the measuring section, and a power source for the measuring section and the processing and transmitting circuit. The sensor is characterized in that it incorporates a battery, thereby making the sensor wireless.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The figure shows an embodiment in which the present invention is applied to a sensor for transcutaneous blood carbon dioxide concentration measurement, and the embodiment consists of a metal cylindrical body 1, a metal lid 2 screwed onto the body 1, and a metal lid 2 screwed onto the body 1. A power supply battery 6 is replaceably provided in the main body 1, and an ion centimeter field effect transistor 4 (hereinafter referred to as 15FET) and a temperature sensing element 5 are fixed to the bottom of the main body 1.
Furthermore, a ceramic circuit board 8 having a crystal oscillator 6 and a processing transmitting circuit (IC chip) 7 on its upper surface, and a l5FE
A gas-permeable and liquid-impermeable thin film 1゜1 stretched over the bottom of the main body 1 with an O-ring 10 to hold an electrolytic solution 9 whose pH changes depending on the carbon dioxide concentration between T4 and T4.
It is equipped with

The above-mentioned 15FET 4 constitutes the measuring section of this sensor, and measures the change in pH due to carbon dioxide gas diffused and dissolved into the electrolytic solution 9 through the thin film 11. P of the l5FET 4
The H sensing portion (gate) is formed by opening a window in the insulator 12.

The PH multiplied signal current measured by the 15FET 4 is modulated by the processing and transmitting circuit 7, placed on a carrier wave with a fundamental frequency formed by the crystal oscillator 6, and transmitted from the antenna 15 to the monitor body (not shown). be done. These l5F
Power for the measurement and processing of signals by the ET 4 and the signal processing and transmission by the transmission circuit 7 is supplied from the battery filter through a metal rod 14 attached to the main body 1 and the circuit board 8. Note that the temperature sensing element 5 is an 15FET.
This is for temperature correction of the measurement sensitivity of No. 4.

Although the above embodiments have been described in particular in relation to a sensor for measuring blood carbon dioxide concentration, the present invention is not limited thereto and can be widely applied to sensors for measuring blood gas concentration or PH. In addition, in the embodiment, an 15FET was used as a sensor measurement section, but the measurement section used in the sensor of the present invention is not limited to this, and other measurement methods may be used, such as a measurement section configured using a glass electrode and a reference electrode. Means can also be used.

As described above, according to the present invention, there is no need to connect the sensor main body and the monitor main body with a lead wire, so there is no need to connect the sensor main body and the monitor main body, so there is no need to worry about the risk of disconnection of the main lead wire. Furthermore, a transcutaneous blood gas sensor is obtained that does not require 5 movements to move the patient.

[Brief explanation of drawings]

The figure is a sectional view showing one embodiment of the present invention. 1: Book body 3 = battery 4:’l5FET 7; Processing and transmitting circuit 9: Electrolyte 11: Thin film 13: Antenna Patent applicant: Sumitomo Electric Industries, Ltd. =166

Claims (1)

[Claims] A measuring section that transcutaneously measures blood gas concentration or PH in the sensor body, a processing and transmitting circuit that processes and transmits the measurement signal from the measuring section, and a power supply battery for the measuring section and the processing and transmitting circuit. A wireless transcutaneous blood gas sensor characterized by incorporating: