JPS5836976B2 - anesthetic vaporizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has an evaporation chamber flow guided through the evaporation chamber and a bypass flow guided parallel to the evaporation flow, with regulating devices in both conduit guides. , an anesthetic vaporizer having a device for preventing the influence of temperature on the mixture composition.

Upon entering the anesthetic vaporizer, a gas stream in communication with the anesthetic contained within the vaporizer is increased to the desired concentration.

The gas flow guided through the anesthetic vaporizer is divided into two partial flows: a bypass flow and an evaporation chamber flow.

The two partial flows are adjusted to each other in precise flow ratios by means of a plurality of valves, at least one of which is adjusted for concentration changes.

The evaporation chamber flow is generally guided through an evaporation chamber storing a liquid anesthetic agent, in which the anesthetic agent is metered to an increasing temperature-related vapor pressure and to an unaltered gas composition. The button is again combined with a metered bypass flow comprising another portion of the gas flow.

The ratio of the two partial streams creates a mixture with the desired concentration of anesthetic vapor.

Based on the temperature-related vapor pressure of the liquid anesthetic, the temperature-related concentration can be obtained.

In order to effectively avoid, inter alia, temperature-concentration relationships in which the mixing ratio is changed very significantly by the evaporative cold produced during evaporation, known anesthetic evaporators are equipped with temperature compensation devices. have.

Known anesthetic agent vaporizers include an adjustable regulating valve placed in a conduit guided through the vaporizer for vaporizing the anesthetic agent, and an adjustable regulating valve placed in a bypass connected in parallel to the vaporizer. It has bypass valves and adjustment members for these valves.

The regulating valve and the bypass valve are arranged concentrically.

The conical valve seat of the regulating valve or bypass valve is fixedly connected to the housing.

The valve seat is connected to the casing 1~ and the movable valve body of the color valve is
Supports the conical valve seat of another valve.

The movable valve bodies of both valves are connected to each other via a temperature sensing element located within the evaporator.

The concentration of the mixture is regulated by outer valves arranged around and concentrically with the inner central valve.

A centrally located valve prevents concentration changes from occurring in the event of temperature fluctuations via the temperature sensing element relative to the temperature of the anesthetic agent.

For this purpose, the temperature sensing element adjusts the inner movable valve body.

Such an arrangement is such that the central valve, which is regulated by the temperature-sensing element, has only a small diameter due to its location and therefore requires a long regulation path in order to produce a sufficient passage cross-sectional change. It is difficult in that it requires

Such an adjustment path is difficult to realize with temperature sensing elements.

Temperature-sensing members with liquid-filled folded bellows may be exposed to the danger that unchecked leakage of the folded bellows, regulated by the temperature-related expansion of the liquid, may alter or impede the function of the sensing member and thereby create a hazard. The anesthetic concentration can be changed in an unplanned manner (
German Patent No. 1922404).

Other anesthetic vaporizers have a concentration control valve in a conduit that is guided from the inlet through the vaporization chamber to the outlet.

This concentration regulating valve is arranged between the evaporation chamber and the outlet and is equipped with a device for temperature compensation.

A regulated bypass valve is arranged at the beginning of the second conduit serving as a bypass.

The bypass valve has a conical valve seat and a conical movable valve body.

A concentrically arranged spring-loaded overpressure valve is provided inside the movable valve body of the bypass valve.

When the set limit pressure of the intake gas is exceeded, the overpressure valve is opened and an additional cross section is freely given to the bypass flow.

A concentration adjustment valve and a bypass valve are spatially arranged in parallel.

The valve seat of the concentration adjustment valve should be made of rust-free steel.
Therefore, the coefficient of thermal expansion is small, and the movable valve body made of plastic has a large coefficient of thermal expansion.

The valve seat and movable valve body are conical in shape.

The passage opening has a conical shape when the concentration regulating valve is open.

Operation is carried out via a steering wheel.

Due to the different thermal expansions of the material of the valve seat button and of the movable valve body...in addition to the usual adjustment by means of the steering wheel, the temperature of the evaporation chamber flow and thus the different temperature of the passage cross section are determined in connection with the partial compensation of temperature effects. You can get change.

Complete temperature compensation is achieved by a further compensation device placed after the evaporation chamber flow of the concentration regulating valve.

The compensator is arranged in the annular gap and furthermore consists of parts with different coefficients of thermal expansion, depending on the temperature of the evaporation chamber stream, and, like the concentration regulating valve, is made of rust-free steel and plastic I4. Out.

The plastic also has a linear "ff,Q" course of expansion with respect to temperature which leads to an 8°C over-compensation and under-compensation of the two temperatures.

Furthermore, plastics have a swelling state in the presence of customary anesthetics, and this effect is over-balanced by non-adjustable temperature compensation.

Furthermore, it must be taken into account that plastics tend to flow during pressure loads and that this flow additionally changes the regulation (US Pat. No. 3,420,233).
2 specification).

Another anesthetic vaporizer with an evaporation chamber conduit button and a bypass may have a regulating valve in both conduits with a conical valve seat and a conical movable valve body.

Both regulating valves are arranged spatially parallel to one another and are connected to each other in such a way that when one regulating valve is set open, the other regulating valve is set closed.

The regulating valve in the bypass solves the following two problems.

One is the regulation of the bypass flow, and the other is the compensation of the changed volume and concentration of the evaporation chamber stream by a factor of 5 to the temperature changes that occur during evaporation.

Both problems are solved by the valve cross section.

This change in valve cross section is effected by manually adjusting the valve spindle as well as by thermal expansion of the sensing device.

The sensing device is directed from a valve spindle extending within the evaporation chamber 1, which valve spindle is surrounded by a sleeve connected to the valve spindle within the evaporation chamber.

The sleeve has a conical valve seat belonging to the conical valve body located at the same height at the upper end of the sleeve opposite to the point where it is connected to the valve spindle, and this valve seat is a part of the bypass. It is.

The valve spindle and spring IJ are made from materials having different coefficients of thermal expansion.

Temperature differences within the evaporation chamber cause length changes within the spindle extension as well as within the sleeve.

This length change affects the opening cross-section of the regulating valve in the bypass.

The bypass is therefore varied by the rotation of the valve spindle as well as by temperature influences.

Temperature compensation is achieved through the selection of spindle button and sleeve materials.

The gap in such anesthetic vaporizers, the gas-tight and at the same time movable penetration of the sleeve through the wall of the vaporization chamber, requires considerable expenditure.

Furthermore, in connection with the respective adjustment of the binostatic regulating valve, different effects of temperature compensation occur in the passage of such a valve.

After all, due to the conical annular gap such a valve VC
However, the difficulty is that only the large overall length of the spindle extension provides the necessary adjustment path from the different thermal expansions (German Patent No. 1566).
596 Specification).

The object of the invention is to provide an anesthetic agent with a device for preventing the influence of temperature on the mixture composition, such that the influence of temperature is compensated for by means of a regulating device in the bypass when the withdrawal quantities are rapidly alternated. It is to provide an evaporator.

A short adjustment path is required for this purpose.

It is simple in structure to allow for easy operation and maintenance, and is fully functional under all circumstances.

In order to solve this problem, in one embodiment of the invention, a regulating device for the bypass is arranged around and concentrically with the regulating device for the evaporation chamber flow, and extends into the evaporation chamber. a U-shaped hollow annular body made of a material with a high coefficient of thermal expansion; a hollow cylindrical body with a low coefficient of thermal expansion inserted into the hollow annular body and tightly connected to the bottom of the U-shaped body; and a casing. an annular body suspended from the casing via a sealing member opposite the free end face of said hollow cylinder by a tensile member movably guided therethrough and consisting of a material having a coefficient of thermal expansion smaller than that of the casing material; Furthermore, an annular gap is formed between the end surface of the hollow cylindrical body and the end surface of the annular body located opposite to the end surface.

The advantage obtained by the invention is that the regulating device for the bypass is arranged around and concentrically with the regulating device in the steam chamber flow, thereby creating an annular gap of large surface area. A cross-sectional change is already produced in the axial direction by a short stroke movement of the adjusting device.

Such a stroke movement is carried out directly in the cross section by the rectangular arrangement of the annular gap, without the aid of an angular function such as in the case of a conical annular gap.

The actuated short stroke movement is even more advantageous because, during compensation, the height of the annular gap is changed rapidly by the movement of the two surfaces which limit it, due to the double adjustment path. achieved.

In the configuration of the present invention, the hollow cylindrical body is configured as a flat flange, and the annular body is configured as a flat surface perpendicular to the axis.

This advantageous design of the annular gap with variable height results in an opening cross section that can be easily and directly varied in the adjusting device Vci for the bypass.

By using the tensile member configuration button as a threaded port and the elastic sealing element between the casing and the annulus, the gap height for the regulation of the bypass flow can be varied in a simple manner.

This is because the annular body can be adjusted to the gap height by simply turning the screw.

The resilient sealing member allows for long distances of the toroid.

In another embodiment of the anesthetic vaporizer, the gas guide body is arranged inside a chamber defined by the walls of the hollow annular body and has a button and a passage gap formed by the walls.

An advantageous guidance of the evaporation chamber flow is obtained along the compensating section defined by the hollow annular body, so that temperature changes occur directly and rapidly.

The invention will be explained below with reference to the exemplary embodiments shown.

The supplied gas passes through the inlet 1 into the casing 2 of the anesthetic vaporizer.

At a separation point 3, a bypass flow is separated into a bypass flow passing through a bypass conduit 4 and an evaporation chamber flow guided through an evaporation chamber conduit 5.

An evaporation chamber 6 contains a liquid anesthetic 7.

The evaporation chamber 6 is delimited by a cylinder 8, which is tightly connected to the housing 2 via a sealing element 9.

The seal member 9 is held by a ring 10.

The ring 10 carries a cylindrical sheath 11 on its inside.

This cylindrical covering has a length such that the gas outlet of the vaporization chamber stream flowing from the vaporization chamber conduit 5 via the cored hose 12 is ensured above the anesthetic liquid level 13 .

The evaporation chamber flow is guided along the inner button and the outer side of a helically wrapped cored hose 12 which is supported inwardly by a coiled spring core 14 .

The cored hose 12 is connected to the cored cover 15 and the button is pressed, and this cored cover is immersed in the anesthetic agent γ and supplies the anesthetic agent to the cored hose by capillary action.

The evaporation chamber flow, which fills the evaporation chamber 6 with anesthetic vapor, passes by the gas guide 16 and conically passes through the gap 19 defined by the wall 17 of the hollow annular body 18 and the gas guide 16. It flows into the shaped dosing member 20.

In this conical metering element, the evaporation chamber flow passes through the bore 21 into the annular channel 22.

A conical annular gap 23 is formed by the casing 2 and the conical dosing element 20 .

The conical dosing element has its cross-sectional area adjusted by the steering wheel.

When rotating the handle wheel 24, the conical metering member 20
The pin 25 serves to prevent the parts from rotating all the way.

The evaporation chamber flow flows through the conical annular gap 23 into the annular passage 26 and meets the bypass flow again at a gathering point 27 .

Bypass flow passes through bypass conduit 4 to annular gap 28
and through hole 29 to gathering point 27 .

The annular gap 28 is defined by a plane 30 of the annular member 31 and a plane 32 of the hollow cylinder 33 arranged in the hollow annular body 18 .

The hollow annular body 18 and the hollow cylindrical body 33 are tightly connected to each other by screws 34.

The hollow annular body 18 is held on the outside by the ring 10 and on the inside by the threaded ring 35.

The different coefficients of thermal expansion of the hollow annular body 18:l and the hollow cylinder 330 result in a distance of 32 planes during temperature changes in the evaporation chamber, with which the height of the annular gap 28 is varied.

The annular member 31 is connected to a sealing member 37 by a threaded bolt 36.
The casing 2V7C is held through the casing 2V7C.

The threaded bolt 36 is made of a material with a smaller coefficient of thermal expansion than the casing, so that the various expansions cause the annular gap height to change as a function of the temperature of the evaporation chamber stream.

Furthermore, for adjustment, the height and thus the free cross section of the annular gap 28 can be varied via the annular element 31 by adjusting the threaded bolt.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of the anesthetic vaporizer of the present invention. DESCRIPTION OF SYMBOLS 1... Inlet, 2... Casing, 3... Separation point, 4... Bypass conduit, 5... Evaporation chamber conduit, 6...
- Evaporation chamber, 7... Anesthetic agent, 8... Cylinder, 9... Seal member, 10... Ring, 11... Cylindrical covering, 1
2... Corded hose, 13... Anesthetic liquid level, 14...
... Coiled spring core, 15 ... Cored cover, 16...
- Gas guide body, 17... wall, 18... hollow annular body,
19... Gap, 20... Conical metering member, 2
DESCRIPTION OF SYMBOLS 1... Hole, 22... Annular passage, 23... Conical annular gap, 24... Hand wheel, 25... Pin, 26... Annular passage, 27... Gathering point, 28・・・
- Annular gap, 29... hole, 30... plane, 31
...Annular body, 32...One plane, 33...Hollow cylindrical body, 34...Screw, 35...Threaded ring, 36...
Screw bolt l・, 37... Seal member.

Claims (1)

Claims: 1. an evaporation chamber flow guided through the evaporation chamber and a bypass flow guided parallel to the evaporation flow, a regulating device in both conduit guides; and a device for preventing the influence of temperature on the mixture composition, a regulator for the bypass is arranged around the regulator for the vaporization chamber flow. A U-shaped hollow annular body 18 is arranged concentrically and extends into the evaporation chamber and is made of a material with a high coefficient of thermal expansion and is tightly connected to the bottom of the U-shaped body within this hollow annular body. A hollow cylinder 33 with a low coefficient of thermal expansion inserted into the casing 2 and a tensile material made of a material with a coefficient of thermal expansion lower than that of the casing material movably guided through the casing 2
The annular body 31, which is suspended from the casing 2 via the sealing member 37, faces the free end face 32 of the hollow cylindrical body 33. The end face 30 of 31 and the annular gap 2
An anesthetic vaporizer characterized by having a precept of 8. 2. Anesthetic agent vaporizer according to claim 1, wherein the face 32 of the hollow cylinder 33 is configured as a flat flange at right angles to the axis. 3. The anesthetic vaporizer according to claim 1, wherein the surface 30 of the annular body 310 is configured as a plane at right angles to the axis. 4. An anesthetic vaporizer according to claim 1, wherein the tensile material is constructed as a threaded bolt 36. 5 Seal member 37 between casing 2 and annular body 31
An anesthetic vaporizer according to claim 1, wherein the anesthetic vaporizer is elastically shaped. 6 The gas guide body 16 is a wall 17K of the hollow annular body 18.
Therefore, the button is placed inside the shaped room, and the wall 1
7. The anesthetic vaporizer according to claim 1, wherein the passage gap 19 is defined by L7.