JPS61284257A - Small gas concentration uniformizing apparatus for measurement metabolism by flow dividing system - 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 (Objective of the Invention) [Industrial Application Field] The present invention relates to a gas concentration equalization device used in the medical and biological fields to detect gas concentrations necessary for metabolic measurement. .

[Prior art]

Since the respiration of a living body is a cycle of inhalation and exhalation, the concentration of the inhaled gas and exhaled gas flowing through the flexible tubes in anesthesia machines, artificial respirators, etc. is repeated between high and low concentrations.

Therefore, in order to detect the concentrations of inhaled gas and exhaled gas necessary for metabolic measurement, it is necessary to eliminate unevenness in the concentrations of each gas and make them uniform.

Therefore, conventionally, as shown in FIG. 10, a so-called mixing chamber 3 made of a box is installed in the middle of the flexible pipe 1, and the unevenness is eliminated inside the mixing chamber 3 to average the gas concentration, and then I was sampling.

[Problems with conventional technology]

However, since this mixing chamber 3 averages the gas concentration of all the intake gas or expiration gas passing through the flexible pipe 1, the volume of the box becomes large (
Approximately 21), when performing anesthesia or artificial respiration, etc., if the concentration of inhaled air is unstable, it is necessary to install separate circuits on the inhalation side and exhalation side of the breathing circuit, which means that the mixing chamber as a whole occupies a large space. As a result, it was not suitable for clinical practice where various instruments were complicated.

In addition, in this conventional method, since the volume of the mixing chamber 3 must be large (approximately 41 cm), a large volume is wasted in the circuit, and as a result, when performing artificial respiration, There was also a safety issue in that the gas in the circuit was compressed by the positive pressure during the exhalation phase, and the set ventilation volume did not reach the living body, making this metabolic measurement method virtually impossible to use in daily clinical practice.

(Structure of the Invention) [Means for Solving the Problems] This invention is intended to solve the above problems, and its gist is as follows: a main flow path member through which exhaled air and/or inhaled air of a person flows; a bypass flow path member through which exhaled air and/or inhaled air flows; and a mixing chamber for collecting averaging gas; A small-sized gas concentration for metabolic measurement using a diversion method, characterized in that the mixing chamber is installed in the middle of the main flow path member to divide the flow of the main flow path member, and the mixing chamber is installed in the middle of the bypass flow path member. It is an equalizing device.

[Action of the invention]

Since the compact gas concentration equalization device for metabolic measurement using a flow splitting method according to the present invention is configured as described above, a portion of the gas flowing through the corrugated pipe enters the mixing chamber. The gas concentration will be averaged.

Therefore, the volume of the mixing chamber is smaller (possibly 115 to 1/20) than the conventional mixing chamber, which averages all the gas flowing through the corrugated pipe.As a result, the device itself is compact and suitable for clinical use. It becomes something.

Furthermore, by attaching an adapter to the bypass flow path and changing the division ratio, the response time constant can be changed. Therefore, by increasing the flow rate of gas flowing into the bypass flow path by increasing the division ratio, it can be applied to children, and by decreasing it, it can be applied to large ventilation volumes during exercise.

[Explanation of Examples]

Hereinafter, the present invention will be described in detail based on the drawings. In this embodiment, two mixing chambers are provided in one box to simultaneously equalize the concentrations of inhaled gas and exhaled gas.

In FIG. 1, 11 is a box, and two mixing chambers 13
a, 13b. Reference numerals 15 and 17 denote flexible tubes at the tip end, and 19 and 21 denote flexible tubes at the rear end, which are connected to the box 11, respectively. Here is the tip part serpentine pipe 1
5 and the rear end serpentine pipe 19 are for passage of intake gas, and communicate with each other via a passage pipe 35 (described later) of the box 11 and the like. On the other hand, the tip end serpentine tube 17 and the rear end serpentine tube 21 are for exhaled gas to pass through.
They communicate with each other via a flow path pipe 37, which will be described later.

In other words, the box 11 and, by extension, the mixing chamber 13a
, 13b is installed in the middle of the flexible pipe.

Further, 23 is a three-pronged articulating tube (so-called Y-piece), which is fitted onto the tip of the tip end serpentine tube 15 and 17.

This bite tube 23 is for the person to be anesthetized M (person to be measured) to bite, and constitutes a part of the breathing gas flow path.

In addition, 25 is a gas analyzer, and the two nitrogen-containing mixtures 1
Collect the gas from 3a and 13b and extract the oxygen gas in the gas,
This is used to detect the consumption of anesthetic gas, etc.

Next, the box 11 will be explained in detail based on FIGS. 2 to 8.

The box 11 is composed of a tapered flat cylindrical body 27 and a lid 29.31 that covers both openings of the cylindrical body 27 (see Fig. 2-45). Reference numeral 33 is a partition wall; By partitioning 11 approximately at the center in the axial direction, 2
It forms two mixing chambers 13a, 13b (see Fig. 6).

35 and 37 are flow path pipes, and the mixing chambers 13a, 13b
The cover body 29.31 is hermetically fixed to the cover body 29.31 while passing through the cover body 29.31. Further, 39 and 41 are 5-shaped inflow pipes, which are hermetically pierced through the side walls of the flow path pipes 35 and 37.

These inflow pipes 39.41 are for dividing the intake gas or exhalation gas flowing through the flow path pipes 35.37 into the mixing chambers 13a, 13b. In addition, an adapter (not shown) is attached to the inflow opening T of the inflow pipe 39, 41, and the said opening T
By changing the cross-sectional area of the mixing chambers 13a, 13b
By increasing the diversion ratio and increasing the flow rate of gas flowing into the bypass flow path, it can be used for children, and by reducing it, it can be used for large ventilation volumes during exercise. on the other hand,
43 and 45 are five-shaped outflow pipes, and flow path pipes 35.
It is hermetically sealed to the side wall of 37. These outflow pipes 43.45 return the inhaled gas or exhaled gas in the concentration adjustment chambers 13a, 13b to the flow path pipes 35.37. Note that the cross-sectional area of the outflow pipes 43.45 is equal to that of the inflow pipes 39.41.

Next, 47 is a through hole 49.49. ... is a partition plate having an inflow pipe 39, 41 and an outflow pipe 4 in the box 11.
3.45, and partitions the mixing chambers 13a and 13b.

Therefore, the partition plates 47 in the mixing chambers 13a and 13b
The downstream side of the through hole 49.49. Because the inhalation gas or exhalation gas that has passed through is stored, the unevenness in gas concentration is smaller than on the upstream side of the partition plate 37.

Reference numerals 49 and 51 are collection tubes whose tips are connected to the mixing chamber 13a.

open to the downstream side of the partition plate 47 in 13b, and
It is fitted into the lid 29 with the rear end open to the outside of the case 11. This collection tube 49.51 is connected to the mixing chamber 13a, 1
3b is sampled and supplied to the gas analyzer 25. In addition, 53.53.・・・
* is a pore drilled at the tip of collection tube 49.51.

Additionally, an auxiliary chamber (
By providing a chamber (not shown) and temporarily storing the sampled gas in this auxiliary chamber, it is possible to further correct the unevenness of the gas concentration.

Note that the inflow pipe 39.41 and the outflow pipe 43.45 in this embodiment correspond to the bypass channel member of the present invention,
Also, the flow path pipes 35, 37, and the tip end serpentine pipe 15.1? ,
The rear end serpentine tube 19.21 and the bite tube 23 correspond to the main flow channel member of the present invention.

FIG. 9 shows another embodiment, in which the device of the present invention is provided separately for inhalation gas and exhalation gas.

(Effects of the Invention) The small-sized gas concentration equalization device for metabolic measurement using a branch flow system according to the present invention connects an anesthesia machine or artificial respirator to a person to be measured, and a main stream through which expiration or/or inhalation of the person flows. A channel member, a bypass channel member, and a mixing chamber for collecting the averaged gas, the bypass channel member being provided in the middle of the main channel member to divide the flow of the main channel member, and The mixing chamber is installed in the middle of the bypass channel member.

Therefore, a portion of the gas flowing through the flexible pipe enters the mixing chamber, and the gas concentration is averaged within the mixing chamber.

Therefore, the volume of the mixing chamber is smaller (115 to 1/20 possible) than the conventional mixing chamber, which averages all the gases flowing through the corrugated pipe.As a result, the device itself becomes more compact, making it suitable for clinical use. It becomes what it is.

Furthermore, by attaching an adapter to the bypass flow path and changing the division ratio, the response time constant can be changed. Therefore, by increasing the flow rate of gas flowing into the bypass flow path by increasing the flow rate, it can be used for children, and by decreasing it, it can be used for large ventilation volumes during exercise.

Furthermore, in this invention, the volume of the mixing chamber can be made much smaller than in the past, so there is no large waste of volume in the circuit as in the past, and as a result, even when performing artificial respiration, exhaled air is Since the gas in the circuit is not compressed due to the positive phase pressure, the set ventilation volume can easily reach the living body, and as a result, it is easy to use in daily clinical practice from the standpoint of safety.

In addition, in this invention, if the inflow openings of the bypass flow path member are opposed to each other in the upstream direction of the main flow inside the main flow path member, the flow velocity of the main flow channel and the flow velocity of the bypass flow channel can be adjusted. It can be obtained approximately proportionally.

[Brief explanation of the drawing]

The drawings show an embodiment of a small-sized gas concentration equalization device for metabolic measurement using a split flow method according to the present invention. , Figure 4 is a plan view, Figure 5 is a bottom view, Figure 6 is a VI-Vf cross-sectional view in Figure 5, Figure 7 is a ■-■ cross-sectional view in Figure 6, and Figure 8 is a cross-sectional view in Figure 6. ■ in
-■ sectional view and FIG. 9 are diagrams of another embodiment in use. FIG. 10 is a sectional view of a conventional example. Kuhe M ・・・・・・・・・・・・ Person to be measured T ・
......... Inflow opening (bypass flow path) 13a, 13b... Mixing chamber 1
5.17.19.21.23...Main channel member (15,
17... Tip section flexible tube, 19.21... Rear end section flexible tube, 23... Articulating tube, 35.37... Channel tube) 39.41, 43.45... Bypass channel Parts (3
9,41...Inflow pipe, 43.45...Outflow pipe) Fig. 1 Fig. 4 Fig. 5 Fig. 6 W -' Vtrr -' Fig. 7 Fig. 8 Fig. 9 Fig. 10

Claims (3)

[Claims] (1) A main channel member that connects the anesthesia machine or artificial respirator and the person to be measured and through which the expiration and/or inhalation of the person to be measured flows, a bypass flow path member through which the exhalation and/or inhalation flows, and the average and a mixing chamber for collecting hydrogen gas, the bypass flow path member is provided midway in the main flow path member to branch the flow of the main flow path member, and the mixing chamber is provided midway in the bypass flow path member. A small gas concentration equalization device for metabolic measurement using a split flow method, characterized by being installed in a. (2) The inflow opening of the bypass channel member is arranged to face the upstream direction of the main flow inside the main flow channel member, and the metabolism is achieved by the diversion method according to claim 1. Small gas concentration equalization device for measurement. (3) Compact size for metabolic measurement using a branch flow method according to claim 1 or 2, characterized in that the flow rate ratio between the main flow flowing through the main flow path member and the bypass flow path member is adjustable. Gas concentration equalization device.