DE8805260U1 - Switchable carbon filter for anesthesia circuit system - Google Patents

Description

The invention relates to a filter, in particular a carbon filter for anesthesia circuit systems for the elimination of total anesthetics from the inspiration gas by adsorption of activated carbon, whereby the filter can be assigned to the circuit system.

Such a filter is known, for example, from "Anesthesiology" V 63, No. 1 July 1985, page 125. The disadvantage here is that it is necessary to open or interrupt the circuit system when the filter is to be inserted or removed.

In contrast, it is the task of invention to create an anesthetic circuit system with a filter in which the filter can be switched on or off or even removed as required without having to open and/or interrupt the system.

This object is achieved according to the invention as set out in claim 1

solved.

Advantageous embodiments and developments of the invention

are covered by the supplementary claims.

The invention is described below by way of example with reference to some figures. Fig. 1 shows an overall view of an embodiment of the invention;

Fig. 2 is a sectional view of the valve;

Fig. 3 to 5 individual views of the embodiments according to Fig. 1 and 2, partially sectioned;

Fig. 6 to 15 individual parts of the inventive device according to Fig. 1 to 5.

The device according to the invention shown in Figure 1 comprises a changeover valve 1 and a filter 2. Both

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Parts are connected to one another by means of removable plug-in systems, inner cones 5.1 and 5.2" which are fixed to the filter housing 2/1 and by means of - not visible here - outer cones (4.1 and 4.2) which are fixed to the valve body 1*1 and which can be easily removed or plugged in and are connected to one another in an airtight or gas-tight manner thanks to the fitting cones. The filter housing is hermetically sealed with a cover 2.2 using O-rings and contains the filter substance or the filter carbon.

The valve body 1.1 is provided with an inner coupling cone 5.3 and with a single outer coupling cone 4.3 for detachable or optionally permanently integrated connection to the anesthesia circuit system and has a rotary knob on a pressure plate 9 with which the switching valve 1 can be operated. The operation takes place as a rotational movement limited to a switching path of 90°, whereby a recess (6.1) arranged in the valve cone (6) in the switching position "y" shown here directs the air flow or the breathing air from the inlet A to B via C through the filter 2 and D to the outlet E, while in an alternative switching position "x" the air flow flows directly and exclusively through the valve 1 from A to E and the filter inlet B or the filter inlet hole (7.2) remains closed. In this position, the filter housing 2.1 can be easily separated from the valve housing 1.1 and the filter 2 can be cleaned or replaced without opening and interrupting the anesthesia circuit system. The changeover valve 1 represents the hermetically sealed and, if necessary, openable connecting part between the other components of the circuit system and the filter 2.

The sectional view of the changeover valve 1 according to figure_2 illustrates the switching position "y" according to Fig. 1 again. A cone insert 3 is attached to the valve body 1.1, which rotatably contains the valve cone 6 provided with a continuous recess 6.1 and a rotary knob 8. For a permanently sealing fit and cone seals, a space between the cone insert 3

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A spring ⁴ 10 supported on a pressure plate 9 is arranged between the valve cone 6 and the valve cone 6. The air or gas flow can pass through the inlet port 7.1 and the recess 6.1 into the filter inlet hole (7.2) - not visible here - and into the filter. The outlet hole 7.5 is closed by the valve cone 6.

From Figure 3, the valve body 1.1 is fixedly arranged

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Connecting parts or* the outer coupling cone 4.3 and the inner coupling cone 5.3 and the longitudinal bore 7λ in the cone insert 3 as well as the output bore 7.5 ^rsishtlish.

Figure 4 and Figure 5 show the valve body 1*1 with cut filter 2, whereby the airtight seal between filter housing and closure cover 2.2 is achieved by two O-rings fixed in ring grooves and two fitting cones or a first inner cone 5.1* with a first outer cone & .V/ with a second outer cone 4.2, which are each arranged at the same distance from one another, serve to easily detach the connection between filter housing and valve body. In the switching position "y" shown and indicated by the recess 6.1, the air flow entering at A or through the inlet bore 7.1 passes through the recess 6.1 into the filter inlet bore 7.2, through the filter bore 7.3 filled with filter mass or here with carbon and the filter outlet bore 7.4 to the outlet E and thus filtered back into the anesthesia circulation system.

Figure 6 shows an outer cup 4, as it is available as a standard part with the designation: "Outer cup 22 DIN 13 252", while

Figure 7 shows a complementary inner cone 5 or "inner cone I, DIN 13 252". Both parts are used as coupling elements 4.1, 4.2 or 5.1, 5.2 for an easily detachable but tight plug connection between valve 1 and filter 2.

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Figure 8 shows schematically the valve body 1.1 with the pressure plate 9 screwed on and the

Figures 9 and 10 show the filter housing 2.1 with the filter bore 7.3, the O-rings 2.3 and the closure cover 2.2 in section.

Figures 11 to 15 contain, in assembly sequence, the rotary knob 8 with a stop pin 11 which slides in the circular groove 12 of the pressure plate 9 and which limits the rotation of the rotary knob 9 and thus simultaneously of the valve cone connected to it in a rotationally secured manner and provided with a continuous recess 6.1, as well as the cone insert pressed into the valve body 1.1 in which the valve cone 6 is mounted rotatably but airtight.

By designing the valve as a manually or alternatively automatically operated switching valve, it is possible to switch on the filter at any time as required or to operate the circuit system without a filter, e.g. during anesthesia. In addition, the use of standardized plug-in parts or commercially available cone plug-in systems allows the filter to be easily disconnected and connected to the valve and the valve to the circuit system at any time.

The filter 2 or the switching valve 1 can preferably be used in the inspiration branch of existing anesthesia circuit systems.

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LITERATURE:

1. Epstein HG, Berlin DP (1944)

Removal of ether vapour during anaesthesia. Lancet i : 114-116

2. Enderby DH, Bushman JA, Askill S (1977)

Investments of some aspects of atmospheric pollution by anaesthetic gases- II: Aspects of adsorption and emission of halothane by different charcoals.

Br J Anaesth 49 : 567-573

3» Baumgarten RK (198 5) Simple charcoal filter for closed circuit anesthesia. Anesthesiology 63 : 125

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&bull; f * · · &bull; . \ _ JT" _ · · »» · · · Valve body (housing) filter Positions .Filter housing i 1 Closure lid 1.1 O-ring 2 Cone insert 2.1 Outer cone 2.2 first (upper) outer cone 2.3 second (lower) outer tile 3 External coupling cone 4 Inner cone 4.1 first (upper) inner cone 4.2 second (lower) inner cone 4.3 Inner clutch cone 5 Valve cone 5.1 Aussparoig 5.2 Input Sensing 5.3 Filter inlet bore 6 Filter hole 6.1 Filter outlet bore 7.1 Starting hole 7.2. Rotary knob 7.3. printing plate 7.4 Feather 7.5. Stop pin 8th Groove 9 direct valve path = 1st switching position (x) 10 ABCDE = filter path - 2nd switching position iy) 11 B = F 12 D = Fi α/ε = Filter input Filter output

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Claims (1)

: 0U]2 _% 1988 Filters for anesthesia circuit systems Expectations : 1. Filters, especially carbon filters, for anesthesia circuit systems for the elimination of volatile anesthetics from the inspiration gas by adsorption in activated carbon, whereby the filter can be assigned to the circuit system, characterized in that the filter (2) has a valve (1) or is connected or connectable to a valve (1). 2. Filter according to claim 1, characterized in that the valve (1) and the filter (2) form a detachable structural unit. 3. Filter according to claim 1 or 2, characterized in that the valve is a changeover valve (1). 4r Filter according to one of the preceding claims, characterized in that the changeover valve (1) is designed as a structural unit that can be integrated into the anesthesia circuit system. 5. Filter according to one of the preceding claims, characterized in that the changeover valve (1) has connecting means (4.3, 5.3) for permanent installation in the anesthesia circuit system. ss ss s * &igr; &dgr;. Filter according to one of the preceding claims, characterized in that * the connection between the changeover valve (1) and the anesthesia circuit system consists of standardized external coupling cones η (4.3) on the one hand and internal coupling cones η (5.3) on the other hand, which are complementary to the system connections. 7. Filter according to one of the preceding claims, characterized in that the filter housing (2.1) is detachably connected to the valve body (1.1) or to the housing of the changeover valve (1) [-�Lgr;. 8. Filter according to one of the preceding claims, characterized in that the connection between the filter (2) and the changeover valve (1) consists of matching plug-in systems formed from outer cones (4, 4.1 and 4.2) and inner cones (5, 5.1, 5.2). &bull; 9. Filter according to one of the preceding claims, characterized in that the valve body (1.1) has two outer cones (4.1, 4.2) and the filter housing (2.1) has two inner cones (5.1, 5.2) which are complementary thereto and arranged at the same distance. ^ 1ü. Filter according to one of the preceding claims, characterized in that the changeover valve (1) has a cone insert (3) with inlet (7.1) and outlet bores (7.5) and a valve cone (6) rotatably mounted therein and provided with a recess (6.1). S * * *t 4tt4 4 4 * 4 t « ti « &igr;*·«· &bull;»&bull;»&bull;Sri &bull; · ti····· 11. filter according to one of the preceding claims, characterized in that the recess (6,1) is designed and dimensioned in such a way that in a first switching position (x) of the valve cone (6) it causes direct passage between the inlet opening (7,1) and the outlet bore (7.5) of the switching valve (1), whereby the filter inlet (B) remains closed and in a second switching position (y) the filter inlet (B) is released and the direct outlet bore (7:5) is closed.