JPH031817Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to improvements in gas partial pressure measuring sensors using an electrode method, such as transcutaneous blood gas partial pressure measuring sensors. Conventionally, a transcutaneous blood gas partial pressure measurement sensor has a gas-permeable but liquid-impermeable sensor that includes an electrode part 1 and a thin layer of electrolyte 2 at the tip of the electrode part 1, as shown in FIG. 1, for example. It consists of an electrode membrane 3, a membrane holder 4 that can support the outer circumference of the electrode membrane 3, and a heating part 5 that supports the electrode part 1 and membrane holder 4 and has a through hole for the gas to be measured at the center of the lower surface. , a porous spacer 6 that holds the electrolyte 2 between the tip of the electrode part 1 and the electrode membrane 3 in order to maintain the stability of the sensor.
is interposed to maintain a uniform thickness of the electrolytic solution and to prevent movement of the electrolytic solution due to disturbances such as contact pressure. However, the use of the spacer 6 prolongs the sensor response time because it reduces the diffusion rate of the gas to be measured into the electrolyte 2, and also requires periodic (every 3 to 14 days) electrode membrane and electrolyte replacement. This has the disadvantage of complicating time operations. On the other hand, there is a drawback that without the spacer 6, stable measurements cannot be performed because the electrolytic solution easily flows due to disturbance. The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and for this purpose, the present invention has an electrode part and a gas-permeable but liquid-impermeable electrode capable of retaining a thin layer of electrolyte at the tip of the electrode part. In a gas partial pressure measurement sensor using an electrode method, the inner surface of the electrode membrane facing the electrolyte is roughened by a physical or chemical method,
This feature is characterized in that it suppresses the flow of the electrolytic solution due to disturbances and enables stable measurements, while at the same time shortening the response time and facilitating operations when replacing the electrode membrane and electrolytic solution. Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Figure 2 shows an example of the present invention and is the same as Figure 1.

【table】

[Table] From the above results, it can be seen that the response time of sensor C of the present invention is significantly shortened compared to conventional sensors A and B. Further, FIG. 3 shows the results of measuring blood carbon dioxide gas in an experiment carried out on a human body using sensor C of the present invention and sensor D, which has exactly the same structure as sensor C except for roughening the electrode film. From the results of this experiment, it can be seen that sensor C of the present invention, in which the electrode film was subjected to surface roughening treatment, was capable of much more stable measurement than sensor D, in which surface roughening treatment was not performed. As described above, according to the present invention, it is possible to obtain a gas partial pressure measuring sensor that is capable of stable measurement, has a significantly shortened sensor response time, and is easy to operate when replacing the electrode membrane and electrolyte. The present invention is a transcutaneous blood carbon dioxide measurement sensor,
It can be widely applied to gas partial pressure measurement sensors using electrode methods that apply electrochemical phenomena, such as transcutaneous blood oxygen gas measurement sensors, gas phase carbon dioxide measurement sensors, and gas phase oxygen measurement sensors.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of the structure of a conventional transcutaneous blood gas partial pressure measurement sensor, Figure 2 is a similar view to Figure 1 showing an embodiment of the present invention, and Figure 3 is the sensor of the present invention. 2 is a graph showing the results of a human-body experiment with a conventional sensor and a conventional sensor. 1... Electrode part, 2... Electrolyte, 3... Electrode film.

Claims (1)

[Claims for Utility Model Registration] (1) Gas partial pressure sensor using an electrode method, comprising an electrode part and a gas-permeable but liquid-impermeable electrode film that retains a thin layer of electrolyte at the tip of the electrode part. In,
A gas partial pressure sensor characterized in that the inner surface of an electrode membrane facing an electrolytic solution is roughened by a physical or chemical method. (2) The gas partial pressure sensor according to item 1, wherein the decrease in the electrode film thickness due to the roughening is about 1/5 to 1/20 of the electrode film thickness. (3) The gas partial pressure sensor according to paragraph 1 or 2, wherein the sensor is a transcutaneous blood gas partial pressure sensor.