JPS6157773B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for measuring PH concentration in body cavities.
Concerning a measuring device.

For example, when examining the condition of the stomach,
Sometimes it is necessary to measure the PH concentration, and in such cases a PH measuring device is used.

Conventionally, the above-mentioned PH measuring device is configured by providing a liquid junction member and a semiconductor ion sensor at the tip of the tube, and also disposing a reference electrode near the liquid junction member. After introducing the tube into the body cavity through an endoscope, the tube is filled with an electrolytic solution, and the electrolytic solution is infiltrated into the liquid junction member to measure the PH concentration. I was doing it.

By the way, when the above PH measurement device is introduced into the body cavity via an endoscope, the body cavity is pressurized, so unless a pressure greater than the pressure inside the body cavity is applied to the electrolyte in the tube, the above It is not possible to infiltrate the liquid junction member with the electrolytic solution. Moreover, if the pressure applied to the electrolyte is weakened, the pressure inside the body cavity causes the biological tissue to pass through the liquid junction member and come into contact with the reference electrode, making it impossible to measure the pH.

Conventionally, in order to pressurize the electrolyte, a cylinder such as a syringe was provided at the rear end of the tube, a piston was inserted into the cylinder, and the piston pressurized the electrolyte filled in the tube. However, since the tube has a relatively large diameter, it is necessary to continue applying a considerable operating force to the piston in order to keep pressurizing the electrolyte to a pressure higher than the pressure inside the body cavity. It becomes extremely difficult to continue applying pressure, that is, to keep the electrolyte infiltrating the liquid junction member.
There was a problem that PH measurement could not be carried out easily and reliably.

This invention was made based on the above circumstances, and its purpose is to make it possible to pressurize the electrolyte solution to a pressure greater than the pressure inside the body cavity with a slight operating force, thereby reducing the pH concentration in the body cavity. An object of the present invention is to provide a PH measuring device that can easily and reliably measure PH.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 1 is an outer tube. A connection port body 2 is provided at the rear end of this outer tube 1. As shown in FIG. 3, this connection port body 2 is provided with a cylindrical attachment portion 4 fitted to the outer tube 1 at one end side of the base portion 3, and a shaft portion 5 protruding into the attachment portion 4. At the same time, a cylindrical receiving portion 6 whose inner surface is tapered along the axial direction is formed on the other end side. In addition, the shaft portion 5
A passage 7 communicating with the receiving portion 6 is bored along the axial direction, and a storage portion 8 having a larger diameter than the passage 7 is formed in the middle of the passage 7. A valve body 9 is housed in the housing portion 8, and the valve body 9 is urged by a spring 10 so as to close one end portion of the passage 7 communicating with the receiving portion 6. Therefore, the storage portion 8, the valve body 9, and the spring 10 form a check valve A, and the check valve A allows an electrolytic solution L, which will be described later, to flow into the passage 7 only in the direction of the arrow. It is becoming possible to do this.

As shown in FIG. 2, inside the tip of the outer tube 1, there is a semiconductor ion sensor 11 and a liquid junction member 12 made of porous ceramic or the like that contacts the sensor 11 and closes the opening at the tip of the outer tube 1. It is provided. Further, a comparison electrode 13 is provided closer to the rear end than the liquid junction member 12 . Lead wires 14 connected to the semiconductor ion sensor 11 and the comparison electrode 13...
is liquid-tightly led out from the connection port body 2 fitted into the outer tube 1 via the packing 15 and connected to the PH display meter 16.

Furthermore, an inner tube 17 having a smaller diameter than the outer tube 1 is inserted through the outer tube 1 .
The tip of the inner tube 17 is connected to the liquid junction member 12.
It faces away from the rear surface of the connector, and its rear end fits into the shaft portion 5 of the connection port body 2. Further, a cylinder 18 such as a syringe has a tapered part 18a formed at its tip removably fitted into the receiving part 6 of the connection port body 2. A piston 19 is movably housed in the cylinder 18, and by pushing the piston 19 into the cylinder 18, the cylinder 18
The electrolyte L in the inner tube 17 is caused to flow out from the inner tube 17, and the liquid junction member 12 facing the tip of the inner tube 17 is
It has become possible to infiltrate the

The PH measurement device having the above configuration is introduced into the body cavity through a channel of an endoscope (not shown), and then presses the piston 19 to infiltrate the electrolyte L into the liquid junction member 12. At this time, since the inside of the body cavity is pressurized as described above, the pressure inside the body cavity is applied to the liquid junction member 12. Therefore, in order to infiltrate the liquid junction member 12 with the electrolytic solution L, it is necessary to continue applying an operating force to the piston 19 that overcomes the pressure inside the body cavity.

By the way, in this invention, the inner tube 17 having a smaller diameter than the outer tube is inserted into the outer tube 1 and the electrolyte L is caused to flow out from the inner tube 17. , only a small pressure is applied compared to the opening at the tip of the outer tube 1.

Therefore, by continuing to apply a slight operating force to the piston 19, the electrolytic solution L can flow out from the inner tube 17 and infiltrate into the liquid junction member 12, making it easy to measure the PH concentration in the body cavity. You can definitely do it.

Further, the inner tube 17 communicates with a cylinder 18 that supplies the electrolytic solution L via a check valve A provided in the connection port body 2. Therefore, even if the operating force applied to the piston 19 is removed, the check valve A
This prevents the electrolytic solution L in the inner tube 17 from being pushed back into the cylinder 18 by the pressure within the body cavity, so that the PH concentration within the body cavity can be reliably measured.

Note that this invention is not limited to the above embodiment,
For example, as shown in FIG. 4, the reference electrode 13 is fitted and held in the opening at the tip of the inner tube 17, and an outlet 20 is bored in the peripheral wall of the tip of the inner tube 17 to allow the electrolyte L to flow out. This can prevent the reference electrode 13 from moving within the outer tube 1 and coming into contact with the semiconductor ion sensor 11. It should be noted that the same parts in this embodiment as in the above-mentioned embodiment are given the same symbols and the explanation thereof will be omitted.

As described above, the present invention has a tip connected to an outer tube in which a connection port body is provided at the rear end, a liquid junction member, a semiconductor ion sensor, and a reference electrode are arranged in the vicinity of the liquid junction member inside the tip. An inner tube having a smaller diameter than the outer tube is inserted through the inner tube facing the liquid junction member and having its rear end connected to the connection port body, so that the electrolyte flows out from the inner tube and infiltrates into the liquid junction member. . Therefore, since only a small amount of pressure inside the body cavity is applied to the tip opening of the inner tube, which has a smaller diameter than the outer tube, compared to the outer tube, the electrolyte can easily flow out from the inner tube, and the electrolyte can be securely attached to the liquid junction member. It has a great practical advantage of being able to accurately measure the PH concentration in body cavities by infiltrating the body cavity.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of the tip of the outer tube,
Figure 3 is also a sectional view of the rear end of the outer tube,
The figure is a sectional view of the tip of the outer tube showing another embodiment of the invention. 1... Outer tube, 2... Connection port body, 11...
Semiconductor ion sensor, 12... Liquid junction member, 13...
...Reference electrode, 17...Inner tube, L...Electrolyte solution.

Claims (1)

[Claims] 1. An outer tube with a connection port provided at the rear end;
A liquid junction member and a semiconductor ion sensor provided inside the tip of the outer tube, a comparison electrode placed near the liquid junction member in the outer tube, the tip facing the liquid junction member, and the rear end facing the liquid junction member. 1. A PH measuring device characterized by comprising an inner tube connected to a connection port and inserted into the outer tube and filled with an electrolyte having a smaller diameter than the outer tube.