JPS5981853A - Gas leading device for mass spectrometer - Google Patents

Abstract

PURPOSE:To secure such a device that comprises less replacement parts in number and makes the replacement time reducible to the shortest possible extent, by using a tube clamping mechanism and a connector capable of locking a filter and a setting metal device either. CONSTITUTION:A connector 31 is provided with a hole 36 for installing a setting metal device 32 and another hole 33 for inserting a screw 38 and a filter 33 into the connector. The setting metal device 32 is welded with the filter 33 at its tip end, and connection between a resin tube 39 and a small tube 32b takes place in a way of pressing the clamping metal device 30 down by a cap nut 34. These holes 36 and 37 are different in each diameter while the cap nut 34 presses the setting metal device 32 by pushing the clamping metal device 30, keeping its airtightness by means of a rolling part 36. When a gas leading quantity is reduced due to loading in the filter 33, those of cap nut 34, clamping metal device 30, resin tube 39 and rolling part 35 are all removed and then the setting metal device 32 and the filter 33 are replaced with a new one in a lump instead.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for sampling a gas to be measured in a mass spectrometer;
This invention relates to a gas introduction device for transportation.

[Technical background of the invention and its problems]

When measuring a patient's respiratory gas with a mass spectrometer, the gas to be measured must be sampled from the patient and delivered to the mass spectrometer. This is accomplished by a gas introduction device, which is typically placed between the patient's airway tube and the ventilator.

A typical example of a conventional gas introduction device is shown in FIG.

A filter 111, a metal fitting 12 for mounting this filter, a resin tube 13 for transporting gas to the analysis section, a connector for connecting a ventilator and an airway tube from the patient, and this connector. The roller 15 is used to fix the resin tube to the resin tube, and the screw 16 is used for mounting.

Filter 11, mounting fittings 12, and resin tube 13
The tubes are glued together because they can cause serious damage to the patient if they become detached and enter the artificial respiration or airway tube.

The resin tube 13 and the connector 14 are fixed to each other by the friction between the rolling 15 caused by pressing the rolling 15 with the screw 16 and the resin tube, and airtightness is maintained by this rolling.

The period during which the gas introduction device can be used is determined by the condition of the filter 11 being clogged with impurities. Therefore, when the filter 11 becomes clogged, the filter 11 must be replaced.
2 and the resin tube 13 are each glued together,
Everything had to be replaced. The diameter of the filter hole is generally 0.1+m or less, and the inner diameter is III+
Since the + resin tube does not get clogged, there is a waste of replacing the resin tube, which takes time.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas introduction device that has fewer parts to be replaced than conventional devices and can shorten replacement time.

[Summary of the invention]

The present invention uses a mechanism for tightening the tube and a connector capable of fixing metal fittings for filter and attachment.The filter and attachment use four sections for attaching and detaching the metal fittings to and from the tube.

r Effects of the Invention] According to the gas introduction device of the present invention, when the filter and the fittings are broken or clogged, the filter and the attachment can be replaced with the tube that carries the sample gas to the analyzer as in the conventional case, the filter,
There is no need to replace all the metal fittings for installation; the filter and the metal fittings can be removed from the tube and replaced. This reduces the time required for maintenance, almost eliminates clogging, and eliminates the need for tube replacement.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

Figure 2 j-J: , gas introduction device 21, and mass spectrometer 2
2, the ventilator 23, the airway boo, -124 table, and the relationship between the patient 25. FIG. 3 is a sectional view of a gas introduction device according to an embodiment of the present invention. The connector 31 is a connector that is connected between the respirator 23 and the airway tube 24, and has several metal fittings 32 on the side.
A hole 36, a screw 38, and a hole 37 for inserting the filter 33 into the connector are formed (/).For installation, the fitting 32 has a stainless steel sintered metal filter 33 welded to its tip, and around the On the opposite side of the convex portion 32a filter,
A thin tube 32b for connecting the resin tube 39 is formed. The connection between the resin tube 39 and the thin tube 32b is as follows.
The cap nut 34 is securely tightened by pressing the metal fitting 30 and tightening the resin tube 39 between it and the thin tube 32b.

The holes 36 and 37 are attached to the convex part 32a of the metal fitting 32, and have different diameters to sandwich the rolling 35.
The airtightness is maintained by rolling 35.

Due to this structure, there is no possibility that the fitting 32 will get mixed into the breathing circuit during installation.

When the amount of gas introduced decreases, remove the cap nut 34, tighten the metal fitting 30, resin tube 39, and roller, and remove the fitting 32 and tighten the fitting 32 as shown in Fig. 4. All the filters 33 can be replaced with new ones.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a typical conventional gas introduction device;
The figure shows the position of the gas introduction device when measuring breathing gas,
FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. 4 is a sectional view of a replaced part according to an embodiment of the present invention. 11... Filter 32a... Convex portion 12...
Mounting is with metal fittings 32b...Thin tube 13...Resin tube 33...Filter 14...Connector
34... Cap nut 15, low link 35... ~ Rolling 16... Mounting is screw 36... - Hole 21... Gas introduction device 37... Hole 22... Mass spectrometer 38... Screw 23... Respirator 39...Resin tube 24...Airway tube 25...Patient 30...Tightening is done by metal fittings 31...Connector 32...Installation is done by metal fittings Agent Patent attorney Kensuke Norichika (and one other person) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A gas introduction device for a mass spectrometer, characterized in that it is comprised of a connector for connecting sample gas to an analysis section, a tube for transporting sample gas to an analysis section, and a mechanism for attaching and detachably holding this tube to a metal fitting. .