DE7730219U1 - Device for cooling a part of the body - Google Patents

Description

DESCRIPTION

The invention relates to a device for cooling of a body part.

In U.S. Patent 3,916,911 there is a portable heating and cooling device described, which includes flexible cushions or pads that wrap around a body part of a human or animal patients can be laid around to cause heating or cooling of the body part as needed. This known transportable device is particularly suitable for the treatment of strains, overstretching and other muscle injuries in athletes or racehorses, the treatment should be started as soon as possible, to reduce swelling, fever, or other symptoms. There is such a device available, one can draw on the inconvenient and cumbersome use of ice packs for treating such Injuries and muscle diseases or inflammation forgave,

ZJUEXXOXXEX: 7OfTSCKIC ££ OSTD JlS & CO-EJT tUt-llTttllCBX HYfOtH.- IT. TnCHtiT.TI »» Tr

0 &

7730ΖΪ9 15.0 & 78

• · C ·

* it

Furthermore, in the applicant's US Pat. No. 4,026,299, a device is disclosed described, which also allows both heating and cooling, with a choice between a heating and a cooling with the help of a reversing valve is possible in which at least one with

l.fVsXXJC.CtUl'XXCrXX V ^ X Kf ^ · χΧ ^ 7 «ζ7Ο ^ .UC ^^ W ^ .I ^^ L-Crfc? X3_CiJlbSC7XX VVX XXCCJXV (C-XJt _t ** V} UUU to which the quick-release couplings between the actual device and the cooling or heating pads belong.

In contrast to this device, which works as a heat pump, a device has been created by the invention, which includes a device for supplying a coolant, coolant lines and a cushion, but in which an auxiliary evaporator is present, which with a bypass line and a preferably thermostatically controlled valve works together, so that you can choose the desired temperature of the cooling pad and automatically maintain it. In a preferred embodiment of the invention further comprises a resistive heating element is used which is arranged in the pad close to the cooling tube _s is such that it, if necessary, it is possible to use the device as a heating device, while the means are located for feeding of the coolant out of operation.

The device according to the invention includes one with a Coolant working cooling device and lines to

7730219 6/15/78

Supplying the coolant to other parts, e.g. a compressor, a condenser, a blower, a cooling pad and other lines that act as evaporators and wrap around a part of the body to be cooled, e.g. an arm or a leg or the like, of a patient permit. The device further comprises an auxiliary evaporator that along the coolant lines between the cooling pad and the compressor extends * To one of these lines is provided upstream of the cooling pad, a bypass connected line * which makes it possible as required to supply the coolant to the auxiliary evaporator, wherein the refrigerant to The cushion and the associated lines are routed around * To open and close the bypass line, a preferably thermostatically controlled valve is used, by means of which the temperature of the cooling cushion is sensed, whereby the thermostat can be set to the desired temperature with the help of an appropriate device. As an additional important feature there may be an overpressure device having a feed line extending from the front of the compressor to the auxiliary evaporator so that it is possible to bypass the condenser; furthermore, an expansion valve can be switched into said line, by means of which a selected pressure of the coolant is maintained in the device.

7730219 15.oa78

Embodiments of the invention are based on the following more detailed explanations of schematic drawings. It shows:

1 shows the inner parts of an embodiment in a partially broken away oblique view a device according to the invention with a bypass line;

FIG. 2 shows a perspective illustration of an opened flexible cushion with a cooling medium line and FIG Resistance heating elements

FIG. 3 shows a further embodiment of the invention in a representation similar to FIG. 1?

4 and 5 each show an embodiment of devices for supplying the cooling medium to a cooling pad; and

6 shows, in a perspective illustration, the use of a skin temperature sensor for thermostatic purposes Control of the cooling device.

In Fig. 1 eina device 10 according to the invention is endangering competitiveness, to which belongs a housing 21, which is drawn partially broken away, to make visible to other parts _c The Hauptteileii the apparatus includes a capacitor and a fan 31 'by means of which air to the tube coils

7730219 15.0678

of the condenser is blown past in order to condense the refrigerant contained therein. A compressor 14 serves to compress the gaseous refrigerant that is supplied to it by an auxiliary evaporator, and accumulator 16 via a conduit 36 _e The auxiliary evaporator or accumulator 16 includes v / ärmeleitende, usually made of copper coils, which serve Aiazu " the temperature of the KühlKüüwL

by further increasing za "while it is being fed back from the cooling" According to FIG. 1, a line 38 supplies the coolant from the compressor 14 to the condenser 12.

Lines 32 and 34 take in the coolant from that Cooling pad au £ via a line 27 to the auxiliary evaporator and accumulator 16 flows back * from the capacitor 12 A line 20 lets the coolant through a dryer 22 to two line sections 25 and 33 »through associated Capillary tubes 26 and 24 and lines 23 and 29 too. the cooling pad flow. In Fig. 1 there is thus a device shown, to which two kisses can be connected; if only a cooling pad is to be used, you will of course need it only one capillary tube and only one outlet line and one return line.

Fig. 2 shows a flexible pillow that can be placed around a part of the body to be cooled. The cushion shown in the open state has an outer, insulating flexible sheet material layer 40 , which is preferably made of a rubber

7730219 6/15/78

mass consists and mil; one deck chichi; made of fabric isi; which consists of a material, as is the case with suits used for windsurfer. Such a guHmi-like one Material provides excellent thermal insulation, it is at the same time relatively light, and it can be easily adapted to the body part of a patient to be cooled. On the inside of the insulating Flaehmatsrialstück 40 is a flexible one Hose 45 attached through which the Eühlmilriel passed can be directed », and with the help of several loops 31 or the like. can be fixed »These loops can be attached to be attached to the inner surface of the insulating cushion with the help of snaps, buckles or the like, but preferably With the help of so-called Velcro fasteners, where one surface has numerous loops, while the opposite surface has small flexible barbs are provided, which with the Loops Working Together One such material is described, for example, in U.S. Patents 3,461,511 and 3,387,345. In each Case are several loops 31 on the inner surface of the insulating Flat material piece 40 distributed so that the flexible hose 46 can be arranged in the desired position. Since the loops can be opened, the tube 46 can easily be grounded separately from the cushion if necessary. Since different parts of the body may need to use a different arrangement, is this one? Purpose possible to remove the coolant hose from a cooling pad and attach it to another pillow in the desired position.

It is also a thermally non-insulating piece of flat material 42 available, which is connected to the piece of flat material 40 with the help of Velcro fasteners 49, 39 or snaps, | Zippers or the like. can be releasably connected. If | a pollution or wear and tear of the non-insulating. Flat material piece 42 has entered, it can be removed Clean and wash or otherwise clean or renew it »It should be noted that the non-insulating flat material ÖCüci 42 is brought to bear on the skin of the body part to be cooled, so that the refrigerant sfalte directly is transferred to the Köx * p part. Removing or loosening the non-insulating piece of flat material 42, the hose

46 accessible so that it can be repaired or replaced. The pad as in FIG. 2 is further provided with tongues 37, which also push buttons or hook and loop fasteners have Open J ₁ and so cooperate with the pad, that the. | Simply place the pillow around a part of the body and I.

can be attached. Further features of such a pillow are | pretend to US Patent No. 4,026,299 of the applicant, to the \ incorporated herein by reference.

Although Fig. 2 shows only a flexible cushion with a cooling tube, however, it should be noted that several such pillows could be used if the size of the device corresponds to the Compressor and condenser is selected accordingly. When using the pillow after. Figo 2 becomes the end of the hose

47 is connected to the line 34, while the hose end 45

«It is connected to the line 29 of the device according to FIG. Here, the cold coolant flows from the outlet line 29 through the hose 46 of the cooling cushion and then through the line 34 to be returned, via which the refrigerant is supplied to the auxiliary evaporator 16. It is appropriate Provide quick-release couplings so that the connections between the bztf. every pillow and cover can be easily manufactured or released. For example, these couplings are of the type disclosed in U.S. Patent 2,823,048 is described; the couplings are expediently installed in a cover plate, not shown, of the device.

As mentioned, there is an important feature of the invention Device in the use of a bypass line with an associated valve for maintaining the selected Temperature of the or each cooling element, according to FIG. 1, such a bypass line 28 connects the lines 20 and 27 with each other, and the bypass line can be opened and closed with the aid of a solenoid valve 30. Will the solenoid valve 30 is open, the coolant flows through the bypass line 28 to the line 2? and the auxiliary evaporator and accumulator 16, so that it is around the dryer 22, the capillary tubes 24, 26 and the coolant lines or The cooling pad hoses are routed around. This means that the cooled coolant is directly on the auxiliary evaporator 16 supplied so that it circulates in the device without further cooling of the flexible hose 46 and the cooling

t * * * * »r> ravvvvT

9 4 * III * I

9 -

effect cushion. When the coolant flows into the line 27, "builds up in the hoses of the cooling pad Counter pressure, which at the same time increases the temperature of the cooling pads. The switched on in the bypass line 28 Solenoid valve 30 is preferably controlled by a thermostat * In this case, a thermostat monitors the temperature of the cooling pillow, and if this temperature is a certain Value exceeds, the solenoid valve 30 closes the bypass line 28, so that the cooled coolant again flows through the hose 46 of the cooling pad. As soon as the pillow has cooled down to the desired temperature again the thermostat causes the solenoid valve 30 to reopen to circulate the coolant around the cushion. The thermostatic controller is preferably provided with a temperature selector assigned to a temperature scale provided, which is arranged according to FIG. 6 on a switchboard of the device. So you can get the temperature you want of the cooling pad, and when the device is in operation, it receives the selected one Temperature of the cooling pad upright by the fact that they Bypass line 28 opens and closes periodically as required.

Figure 3 shows another embodiment of one with a valve provided bypass line, which is then used ^ if Instead of the capillary tubes according to FIG. 1, there is an expansion valve *. In some applications it is preferred Use an expansion valve as there is such a valve

77302Ϊ9 06/15/78

• ·> * ι «ait

- 10-

allows the lowest temperature of the cooling pads with the Hand adjust. In addition, the presence of an expansion valve enables a sensor or container to be provided, in which an additional amount of the coolant is stored so that each during operation of the device Any coolant flow that occurs is automatically compensated for can. If such a sensor or container is available, is it is not necessary to refill the device's coolant reservoir every time small amounts of coolant have been lost from the lines and hoses, as is particularly the case with the use of rubber hoses is possible. It should be noted that such rubber hoses normally have a certain porosity by nature, see above that even with normal use a certain loss of coolant cannot be avoided.

According to FIG. 3, the coolant is supplied to a line section 80 fed from the condenser 12 to then a dryer * Z> and to flow through a line 82 which leads to an expansion valve 72. From the expansion valve this will be Coolant is then fed via lines 23 and 29 to the cooling cushions (not shown). The expansion valve 72 is provided with a knob 73 so that the user can determine the extent of expansion of the coolant in the valve and daini-t the Temperature of the cooling pad can choose. A receiver or coolant reservoir 70 is located between lines 80 and 82 arranged, in which there is a coolant supply of e.g. approx

450 g. Furthermore, a sight glass 71 can be present, so that one can observe the EHhimittelstrom and its occurrence of bubbles or other signs that indicate that the Eühlismittel is too low.

In the embodiment according to FIG. 3, the bypass line 88 is in contrast to the arrangement according to FIG. 1 with the line 38 connected between the compressor 14 and the condenser 12. The reason why the capacitor 12 is bridged in the embodiment according to FIG. 3 is, that if an expansion valve and a receiver or reservoir are used, there is a risk of that the auxiliary evaporator 16 is supplied with an excessively large amount of the liquid coolant when the bypass line is open will. In the embodiment of FIG. 1 with the described However, capillary tubes that do not have a coolant reservoir do not have this problem. There however, the risk mentioned in the execution form Fig. 3, it is preferred that the coolant with the bypass line 88 open to the auxiliary evaporator 16 from the Feed side of the compressor 14 from before it is in the condenser 12 is condensed ,. Otherwise it is similar to the The mode of operation of the device according to FIG. 3 is progressively that of the device according to FIG. 1. As soon as the cooling pad is on the desired temperature has been cooled, actuates the thermostatic sensor the solenoid valve 30 to open the bypass line SS, so that the Künlmlttel the line 27

7730219 1106.78

and the auxiliary evaporator 16 is supplied, the condenser 12, the expansion valve 72 bridges the Eöhlkissen are.

In another Atisführungsform the invention, operating with a pressure means can be present in the or "each cooling pad and the tubes maintain" a minimum pressure * With Hilife such a device it is possible to the generation of a negative pressure in the hoses of the cooling pad Because the flexible hoses may be made of rubber or a synthetic elastomer * which may be porous, the build-up of negative pressure due to insufficient coolant could cause air to enter the hoses and contamination and damage to the compressor. To avoid this, one can use an overpressure device which includes a line and a manually adjustable expansion valve. "Such an arrangement is also shown in Fig", but it should be noted that one can also use exe in the device according to Fig. ^Λ can be used Anten device includes a feed line 89 which is connected to the line 38 on the delivery side of the compressor 14. The line 89 leads to the expansion valve 61, "and a line 85 is connected to the expansion valve, so that the feed line 89 is connected to the line 2? Leading to the auxiliary evaporator 16".

7730219 6/15/78

• · ims ■ * ■ · · ■

• SBl> I IM · ·

* ■ * ■> ■ ■

- 13 -

The expansion valve 61 can be set by the user with the help of a rotary knob 87 so that when the pressure in the device falls below a preselected minimum pressure to which the expansion valve 61 has been set, e.g. a pressure of about 0.07 - 0.14 bar, the valve is opened in order to supply the coolant from the line 38 via the line 89 ″ to the expansion valve 61 and the lines 85 Tand 27 to the auxiliary evaporator 16. This supply of coolant to the auxiliary evaporator is continued * until the pressure in the device has exceeded the minimum pressure again. 3, the feed line 89 is also upstream of the bypass line 88 in connection with the line 38 "If an auxiliary evaporator is present", this can be used with a positive pressure device even if a bypass line is missing. "The auxiliary evaporator 16 also has known Way in the cooling device as an accumulator to the effect. The auxiliary evaporator thus prevents liquid refrigerant from reaching the compressor and leading to damage.

In Fig. 2 is also the use of a resistance heating element shown. In this embodiment, the device according to the invention can thus not only be used in the one described Way as a cooling device, but also as a Heizvorrxch-

7730219 6/15/78

tung uses v / earth. According to Pig. 2 there is an A4 heating wire, which is expedient generally along 'the cooling hose 46 extends within the cushion and is also held in place by the fastening loops 31. the Ends 41 and 43 of the heating element are connected to a switching device connected so that it is possible with the help of a switch arranged on the switchboard of the device, the Heating element HS eil need ice.— and switch off · rTorsalerweiss Of course, the heating device is not used if a part of the body is to be cooled with the aid of the pillow If the compressor and the other parts of the cooling device are out of order * you can remove the cushion in a simple manner use to warm a part of the body when the treatment requires warming rather than cooling » Of course, the resistance heating element is electrically insulated and of such a type that it can be safely positioned along the flexible Arrange cooling hose and can be attached to a flexible cushion of the type described with reference to FIG.

In Fig. 4 and 5 devices according to the invention are shown schematically, which include the lines for supplying the coolant and a cooling cushion 64 with a flexible hose, wherein the flexible cushion with the hose can be placed around a part of the body to be cooled. Here, the pad and the hose 46 are used as evaporators for the refrigerant to effect "Fig. 4" shows the device of FIG. 1 in τη-ί "fe ö-ί-ηβτ» m-i + i a fthft-pAtniSÄfc οτΤλο A -fceruien VA τιτ »ί r>" W_

7730219 6/15/78

device of the type described, while FIG. 5 for the embodiment according to Fig. 3 applies. When operating the Vorrichtimg according to Fig. 4, the coolant is via a line A to the auxiliary evaporator 52, where it is heated to take up more energy. In this case the help comes from the vaporization as an accumulator to the effect. The coolant leaves the auxiliary |

veräampxer 52 via a Lexrang B, aie ZVL u & s compressor "leads. Beyond the compressor, the coolant is fed via a line C to the condenser 55, where it is cooled as it flows through coils; the cooling is assisted by a fan 56, which is relatively cool Ambient air is passed over the cooling fins of the condenser tube coils. The coolant passes from the condenser 55 into a line D. If the cushion 64 is to be cooled, the coolant is passed through a dryer 62, which has an i

Contains desiccant to remove moisture. « Normally the dryer also has a filter or sieve with e.g. 100 meshes per inch so that no I. Particulate material via line E to the capillary | tube 63 can reach. Beyond the capillary tube, the 1 cooled coolant is fed to the cushion 64 via a line F. Does the pillow have the low chosen by the user When the temperature is reached, a thermostat sensing the temperature of the cushion causes a solenoid valve 57 to be switched on.

i is vm to open the line S, before then the coolant I, inter alia, the dryer, the capillary tube and the cooling pad bypassed and via the line; A again the Hilisverdaspier 52

- ιέ ": '

is fed. This bypass route for the coolant becomes held open until the cooling pad has warmed up to the point where further cooling is required; this fact is felt again by the thermostatic sensor, which actuates the solenoid valve 57 to close the bypass line G.

According to FIG. 4, the device operating with an overpressure includes a line H, which is connected to the line C downstream the condenser 55, but connected upstream of the compressor 51; there is also an expansion valve 61 present, which can be set in the manner described in order to in each case the desired minimum pressure in the device maintain. The feed line J carries the refrigerant from the expansion valve 61 out of the line A and the Auxiliary compressor 52 to.

FIG. 5 shows schematically the device according to FIG. 3, in which the coolant is used in the manner described with reference to FIG. 4 Is handled in a manner which, however, differs from the described embodiments in that instead of Kapillarronren a sensor or container for the coolant is available. A dryer 75 and it For example, there may be a window 71 for observing the coolant flow. When the pad 64 is to be cooled, the coolant becomes from the compressor 51 via line C, the condenser 55, the lines D and E, the expansion valve 72,

the line F, the cooling pad 64, the line A, the auxiliary compressor 52 and the line B fed to the compressor again. Once the cooling pad has the desired low temperature has reached, a sensor thermostat causes the valve 57 is opened, whereupon Mn the refrigerant from the compressor 51 through the lines L, G and A and the auxiliary evaporator 52 fed to the compressor via line B again will. This operating state remains until a further cooling of the cooling pad 64 is required, whereupon the Valve 57 is closed in order to supply the coolant again in the manner described to the cooling pad. Also in this In this case, there may be a device working with an overpressure, to which the lines H and J as well as a manually adjustable expansion valve 61 include. If an auxiliary evaporator is available, it can be used with an overpressure working device in connection with a bypass line of the type described or without such a bypass ■ use override line.

As mentioned above, it is convenient to use the cooling device to control thermostatically that the temperature of the cooling pad is sensed. Fig. 2 shows a temperature sensor 84, the is attached to the insulated sheet of material 40 of the cushion near the cooling hose 46, so that it the temperature of the The bypass line is automatically opened and closed depending on the sensed temperature.

_ 18 "-

I t »Vt · · ■ ■ ■ · ■ · I

i «i

is closed. OeT sensor 84 is connected to one end of an insulated line 83 which is provided with a plug socket 87 to which a line leading to the switchboard of the device can be connected with a plug so that the Move the temperature sensor together with the cushion or separately from it and have it repaired or replaced independently.

Fig. 6 illustrates the use of a temperature sensor 94 with a line 9b, the temperature sensor not on the temperature of the pillow but is responsive to the temperature of the patient's skin. This arrangement turns out to be particularly useful when the patient is wearing a plaster cast 92. In such a case, for example, it may be desirable be to reduce the swelling of a limb that has been cast in a cast. However, since a plaster cast itself has a heat insulating effect, a choice must be made and maintaining the desired temperature on others Way as if the pillow could be placed directly on the patient's skin. It may be necessary Maintain a temperature of the pillow between about -6 and about -5-5 ° C, so that a skin temperature of around 15 ° C is reached; here you have to measure the thickness of the plaster cast and take into account the type of coolant used. In view of this, it is expedient and advantageous to use a temperature sensor 94 to be arranged between the plaster cast 92 and the patient's skin. With the help of the cooling pad 90 the

7730219 6/15/78

-SQ »case * · * ·· * *

The plaster cast is cooled depending on the temperature felt; Here the temperature sensor is used to open and close an electronic switching device, by means of which the valve in the bypass line described is controlled set! äBt, where ul ^ SB temperature ¹ monitored by the sensor vszä. a with the help of the valve in the bypass line is maintained. Such a possibility of choosing the skin temperature is particularly desirable for patients who are particularly sensitive to cold. Such a choice of the desired temperature and its maintenance is made possible according to the invention in a very advantageous manner by the bypass line with the valve described and the auxiliary evaporator.

The type of sensor used for the temperature of the skin or the cooling pad is of no decisive importance to. For example, one can use temperature sensitive materials, resistors, etc., which are usually encapsulated in a hard resin are. The housing of the skin temperature sensor can have flat surfaces so that it can be inserted between the skin and a plaster cast and to rest against the skin can bring.

It should be noted that the use of an inventive

Tvieh to a complete bridging

7730219 6/15/78

or insulation of the pillow cushions and the associated hoses. If the valve in the bypass line or the expansion valve the overpressure device is opened, rather generates the flow of coolant in the or each cushion a counter pressure, because part of the coolant is still fed to the cushions, and a significant amount of coolant flows through the line between the pillows and the auxiliary evaporator. In any case, this will reduce the pressure in the pillow is increased and the temperature is increased.

¥ ie described in the said US-PS, the invention is Device preferably enclosed in a portable housing. In any case, cooling pads can be more different Use size, shape and facilities for replenishing coolant. It was said that that The cooling pad is provided with a flexible tube, usually made of rubber or a synthetic elastomer, however, according to the invention it is also possible to use a different material which is attached to the cooling pad and to heat a part of the body to be cooled. For example, ductile copper tubing could be used.

All information and characteristics disclosed in the documents, in particular the disclosed spatial arrangement, insofar as they are individually or in combination with .the state of Technology are new, claimed as essential to the invention.

7730219 15.0R78

Claims (1)

New protection claims 1. Portable device for cooling a body part of a human patient or animal with a compressor, a condenser, an expansion valve and piping, ritteis which a refrigerant from the compressor out one by one the condenser, the expansion valve and an evaporator is then fed back to the compressor to be, characterized in that at least one flexible Kisö ^ n (40, 42) for the evaporator and a pipe or hose line (46) which can be laid around the body part to be cooled, and an auxiliary evaporator (16) belong. 2. Apparatus according to claim 1, characterized by a bypass line that bridges the pipe or hose line (46) and can be shut off by a bypass valve (30) (28; 88) for the coolant. 7710213 15L0E78 ■ ■ * ■ * 3. Apparatus according to claim 2, characterized in that the bypass valve (30) with a Temperature selector and a temperature monitoring device Is equipped for the pillow. 4. Apparatus according to claim 3, characterized in that a temperature sensor (S4j 94) is attached to the cushion (40, 42), and that a switching device (95) adjustable by m & s is provided for the bypass valve (30). 5. Device according to one of claims 1 to 3, characterized characterized in that to the expansion valve between the condenser (12) and an associated pipeline Capillary tubes (24, 26) are arranged, and that the bypass line (28) from elrem point downstream of the capacitor and upstream of the capillary tubes to the auxiliary evaporator (16) extends. 6. Vorrichtimg according to one of claims 1 to 4, characterized characterized in that to the expansion valve arrangement an expansion valve (72) between the condenser and belongs to said pipeline and that the bypass line (88) extends from a point downstream of the compressor (14) extends from and upstream of the ~ condenser to the auxiliary evaporator (16). 7730219 I5.ea78 m ψ * · ■ · ν * ν · * «* ·» Sit 7. Apparatus according to claim 6, characterized through a coolant reservoir (70) connected to said pipeline upstream of the expansion valve (72) is in connection. 8. Device according to one of claims 1 to 7, identified by the combination of one Compressor (14) for the coolant with an auxiliary evaporator (16) and a pressure-sensitive valve (30) built into a bypass line (28; 88). 9. Device according to one of claims 1 to 8, characterized characterized in that a resistance heating element (83) is attached to the cushion £ 40, 42) and the associated hose line (46). 10. Device according to one of claims 1 to 9, characterized by the capacitor (12) associated fan (31). 11 - Cushions for adding heat or cold to one Part of the body of a human patient or an animal, identified by a flexible, heat-insulating material outer piece of flat material (40), a flexible, non-heat-insulating inner piece of flat material (42), Connections (39, 40) between the outer and inner pieces of sheet material and a flexible hose (46), the is arranged between the outer and inner piece of flat material. * ·· * ■ · β »ι Tl •• «••• et ' , ^ _S in 12, cushion according to claim 11 characterized in that the connections (39, 40) are releasable. ISi cushion according to claim 11 or 12, characterized by a lock (37) for releasable Setting the pillow around a part of the body. 14. Pillow according to one of claims 11 to 13, characterized marked that the flexible hose (46) is arranged along a serpentine line and releasably connected to the outer piece of flat material (40). 1730219 15.0 & 78