DE102011004481A1 - Heat transfer structure has longitudinally extended channels that are arranged asymmetric with respect to coordinate axis extended through center of slot opening of longitudinally extended groove - Google Patents

Abstract

The heat transfer structure (1) has longitudinally extended groove with slot opening (8), and channels (4,5,6a,6b) that are extended along longitudinal direction. The heating elements (10,10') and temperature sensors (11') are arranged in the channels. The channels are arranged asymmetric with respect to coordinate axis (7) extended through the center of slot opening.

Description

Background of the invention

The invention relates to a Wärmeisolations- or heat transfer body made of an elastic, flexible material for attachment to the outer peripheral surface of a liquid-permeable hose, wherein the heat-insulating or heat transfer body has a groove extending in its longitudinal direction with a slot opening, wherein the heat insulation or heat transfer body in Has its longitudinal direction extending channels, in which a total of at least one heating element and at least one temperature sensor are arranged. Such a heat insulating or heat transfer body is made DE 298 24 013 U1 known.

Infusion solutions are usually suspended in bottles or bags on a rack in a position above the patient so that the solution can enter the patient's body via hoses by gravity alone. Pumps are therefore usually not necessary.

However, infusion solutions usually have a wide variety of temperatures before being used on the patient because they are stored, for example, in cold storage rooms. Therefore, heating the infusion solution to body temperature is necessary.

Originally, attempts were made to warm the bags before placing the infusion. However, this has the disadvantage that with the need to quickly perform infusions no time required for the sufficient heating of the bag is available. In addition, it is difficult to keep the bag temperature constant for a long time, so that infusions over a longer period can lead to hypothermia of the patient.

To solve this problem, various technical solutions have been developed. Most commonly heaters are placed like a jacket around the infusion tube, as for example in US 2003/0099469 A1 is described. Also describes DE 44 44 180 A1 Such a jacket-shaped tempering device.

However, it is necessary that the temperature is constantly monitored. Because many medical infusion solutions are not only sensitive to high temperatures but also for a patient must always be sure that the infusion temperature is the best possible adapted to body temperature. A constant and careful monitoring of the temperature, as well as an automatic control of the heating power are therefore essential.

Due to the usual construction of devices with almost full-scale heating of an infusion tube, a plurality of channels for heaters, temperature sensors and other functional elements within the shell-shaped body is necessary. Due to the complex structure of this sheathed cable increases the cost of a secure and exactly controllable and / or controllable heating technology.

All devices of this type have an obvious symmetrical distribution of the channels. In this case, in the cross-sectional plane, the coordinate axis extending through the center of the slot opening forms a mirror plane, on both sides of which the channels are arranged exactly mirror-symmetrically.

Unfortunately, it can not be avoided in terms of production technology that the heating channels vary slightly at a distance from the infusion tube. This could lead to a stronger warming of one side.

If one now wanted to save temperature sensors, one would have to measure in advance each individual device and provide the temperature sensors on the side of the sheath line, on the z. B. the heating channel is closest to the infusion tube or is heated faster and / or stronger for other reasons.

Object of the invention

It is therefore an object of the invention to provide a heat transfer body, which is simplified and thus easier to handle, but still meets the high security requirements in this area.

Brief description of the invention

This object is achieved in that the channels are arranged asymmetrically with respect to the longitudinal axis of rotation of the heat insulation or heat transfer body.

Due to the asymmetric distribution of the channels in a heat insulation or heat transfer body according to the invention, one side is defined as a warmer side from the outset. As a result, regardless of manufacturing tolerances in advance clearly determines on which side temperature sensors must be at least attached.

As a result of the structure according to the invention, thermal insulation or heat transfer bodies according to the invention can be simplified and at the same time functionally reliable compared to commercially available devices. Temperature sensors on one side of the cross-sectional plane are sufficient to control and / or regulate all the heating elements in the heat-insulating and / or heat-transferring body and the protective measures and / or reinforcements for the temperature sensors can be simplified. Via two temperature sensors, it is now possible to control and / or regulate the heat transfer body over its entire length in the heating technology.

In a particularly advantageous embodiment of the heat insulation or heat transfer body according to the invention, a first channel, in which a heating element is arranged, is arranged farther away from the hose, as a second channel, in which a heating element is arranged. In such an embodiment of the heating technology only one side of the transmission profile must be thermally monitored, controlled and regulated. Preferably, a single electrical heating conductor is used as the heating element, which runs along a first side of the profile and at the free end of the profile of the electronic heating element is curved and returned to a second side, with only one side is thermally controlled and regulated.

Another embodiment of the heat insulating or heat transfer body according to the invention is characterized in that the coordinate axis extending in cross section through the center of the groove opening divides the heat insulation or heat transfer body into two unequal sides. This results in two different lengths of groove flanks both end in a slot opening to the groove for the infusion tube. Infusion tubes can thus be inserted more easily, even with one hand, into the heat transfer profile.

A development of this embodiment is characterized in that one of the sides has only one channel. Since the warmer side is defined by the asymmetrical division of the channels, the temperature sensors on the colder side and thus also the channels in which they are accommodated, can be omitted.

In a further preferred embodiment, the groove has a diameter of z. B. 3.6 mm +/- 0.35 mm. In this way, a 4 mm infusion tube is reliably held positively and non-positively.

Also advantageous is an embodiment in which the slot opening is 1 mm +/- 0.35 mm wide, if no hose is inserted into the heat insulation or heat transfer body. As a result, the infusion tube in the inserted state in the transfer body is held firmly held on the inner surface of the groove.

Moreover, an embodiment is advantageous, which is characterized in that a reinforcement for stabilizing a measuring zone of a temperature sensor is arranged in at least one of the channels. This avoids a pressure load and / or bending load on the temperature sensor and minimizes the risk of incorrect measurement due to the load. The stabilization protects the temperature sensor (s) from mechanical damage.

In a development of this embodiment, at least one channel has an inner diameter which is smaller than the outer diameter of a temperature sensor to be introduced into the channel or a reinforcement to be introduced into the channel, so that the temperature sensors and reinforcements can be arranged positively and non-positively in the channels and their position is not changed by slipping or shifting.

A further advantageous embodiment is characterized in that the channels ( 4 . 5 . 6a . 6b ) have different inner diameter and / or outer diameter. The diameters depend on the devices to be accommodated in the respective channels.

Also advantageous is an embodiment, which is characterized in that on the outer surface of the heat insulation or heat transfer body, an insulation layer is provided, and that the heat insulation or heat transfer body is made of a thermally conductive material.

Further advantages of the invention will become apparent from the description and the drawings. Likewise, the features mentioned above and those listed further can be used individually or in any combination. The embodiments shown and described are not to be understood as exhaustive enumeration, but rather have exemplary character for the description of the invention.

Drawing and detailed description of the invention

Show it:

1 a schematic representation of an embodiment of the invention heat insulation or heat transfer body with inserted infusion tube and marked coordinate axes;

2 a schematic representation of an embodiment of the heat insulation or heat transfer body according to the invention;

3a a schematic representation of a part of a channel for reinforcements;

3b a schematic representation of a portion of a channel for temperature sensors.

1 shows a schematic representation of an embodiment of the heat insulation or heat transfer body according to the invention 1 with inserted infusion tube 3 and marked coordinate axes. The heat insulation or heat transfer body 1 consists of elastic, flexible material and is covered by an insulating layer 2 ,

In a first channel 4 is a heating element 10 arranged. This first channel 4 is from the inserted infusion tube 3 further away than a second channel 5 in which also a heating element 10 is arranged. It may be at the heating element 10 . 10 ' to act as a single continuous heating element through both channels 4 . 5 passed through or around individual heating elements 10 . 10 ' ,

Another channel 6b is for housing the temperature sensors 11 . 11 ' intended. The temperature sensor shown 11 hidden in the view shown in the channel 6b the temperature sensor 11 spaced from the temperature sensor 11 ' in the canal 6b is provided.

It is advantageous, the measuring zones of the temperature sensors 11 . 11 ' with reinforcements 12 . 12 ' in a canal 6a stabilize so that the temperature sensors 11 . 11 ' not by bending or kinking of the heat insulation or heat transfer body 1 damaged or impaired. The supply lines for the temperature sensors 11 . 11 ' are in the channels 6a . 6b arranged. From the reinforcements 12 . 12 ' is in the 1 and 2 only one reinforcement 12 ' visible because the reinforcements 12 . 12 ' in the canal 6a are arranged one behind the other and spaced from each other.

In commercially available devices that provides through the middle of the slot opening 8th extending coordinate axis 7 an axis of symmetry. Not so in the 1 illustrated embodiment of the heat insulation or heat transfer body according to the invention 1 , Here divides the coordinate axis 7 the heat insulation or heat transfer body 1 into two unevenly shaped sides A, B. One of the sides A contains only the first channel 4 , which continues from the infusion tube 3 is arranged as the second channel 5 on the other side B of the coordinate axis 7 , This is the side B with the second channel 5 as the warmer side B defines, on which the temperature must be monitored.

On side A only the first channel needs to be 4 be accommodated, therefore, can be saved on this page A material. This is advantageous in that because of the infusion tube 3 easier through the slot opening in the groove 9 ( 2 ) can be pressed. The handling of the heat insulation or heat transfer body 1 is simplified in particular when inserting an infusion tube.

In the 3a and 3b is shown schematically how the temperature sensors 11 . 11 ' and reinforcements 12 . 12 ' are arranged to each other in this embodiment. The temperature sensors 11 . 11 ' are in channel 6b arranged. The reinforcements 12 . 12 ' in channel 6a stabilize the heat insulation or heat transfer body 1 at the level of the temperature sensors 11 . 11 ' , so that pressure or bending loads of the temperature sensors 11 . 11 ' be minimized. The diameters of the temperature sensors 11 . 11 ' and reinforcements 12 . 12 ' are slightly larger than the diameter of the channels 6a . 6b so that the temperature sensors 11 . 11 ' and reinforcements 12 . 12 ' positive and non-positive in the channels 6a . 6b can be arranged and their position is not changed by slipping or moving.

The invention relates to a heat insulation or heat transfer body ( 1 ) made of an elastic, flexible material for attachment to the outer peripheral surface of a liquid-flowable infusion tube ( 3 ), wherein the heat insulation or heat transfer body ( 1 ) a groove extending in its longitudinal direction ( 9 ) with a slot opening ( 8th ), wherein the heat insulation or heat transfer body ( 1 ) running in its longitudinal direction channels ( 4 . 5 . 6a . 6b ), in which a total of at least one heating element ( 10 . 10 ' ) and at least one temperature sensor ( 11 . 11 ' ), which is characterized in that the channels ( 4 . 5 . 6a . 6b ) asymmetrically with respect to the cross section through the center of the slot opening ( 8th ) extending coordinate axis ( 7 ) of the heat insulation or heat transfer body ( 1 ) are arranged. The heat insulation or heat transfer body according to the invention ( 1 ) is simpler, easier to handle and thermally safe to control and / or regulate. The high medical safety requirements are improved.

LIST OF REFERENCE NUMBERS

1

Heat insulation or heat transfer body

2

insulation layer

3

infusion tube

4

First channel with heating element

5

Second channel with heating element

6a

Channel for reinforcements and supply lines for temperature sensors

6b

Channel for temperature sensors and supply lines

7

coordinate axis

8th

slot opening

9

groove

10, 10 '

heating element

11, 11 '

temperature sensor

12, 12 '

reinforcements

A, B

Pages defined by the coordinate axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 29824013 U1 [0001]
• US 2003/0099469 A1 [0005]
• DE 4444180 A1 [0005]

Claims (10)

Heat insulation or heat transfer body ( 1 ) made of an elastic, flexible material for attachment to the outer peripheral surface of a liquid-flowable infusion tube ( 3 ), wherein the heat insulation or heat transfer body ( 1 ) a groove extending in its longitudinal direction ( 9 ) with a slot opening ( 8th ), wherein the heat insulation or heat transfer body ( 1 ) running in its longitudinal direction channels ( 4 . 5 . 6a . 6b ), in which a total of at least one heating element ( 10 . 10 ' ) and at least one temperature sensor ( 11 . 11 ' ), characterized in that the channels ( 4 . 5 . 6a . 6b ) asymmetrically with respect to the cross section through the center of the slot opening ( 8th ) extending coordinate axis ( 7 ) of the heat insulation or heat transfer body ( 1 ) are arranged. Heat insulating or heat transfer body according to claim 1, characterized in that a first channel ( 4 ), in which a heating element ( 10 . 10 ' ), from the infusion tube ( 3 ) is arranged farther away than a second channel ( 5 ), in which a heating element ( 10 . 10 ' ) is arranged. Wärmeisolations- or heat transfer body according to one of the preceding claims, characterized in that in cross-section through the center of the slot opening ( 8th ) extending coordinate axis ( 7 ) the heat insulation or heat transfer body ( 1 ) into two unevenly shaped sides (A, B) divides. Heat insulating or heat transfer body according to claim 3, characterized in that one of the sides (A, B) only a first channel ( 4 ) having. Heat-insulating or heat-transfer body according to one of the preceding claims, characterized in that the groove ( 9 ) has a diameter of 3.6 mm +/- 0.35 mm. Heat-insulating or heat-transfer body according to one of the preceding claims, characterized in that the slot opening ( 8th ) with occupation-free groove ( 9 ) has a gap width of 1 mm +/- 0.35 mm. Heat-insulating or heat-transfer body according to one of the preceding claims, characterized in that in at least one of the channels ( 4 . 5 . 6a . 6b ) a reinforcement ( 12 . 12 ' ) for stabilizing a measuring zone of a temperature sensor ( 11 . 11 ' ) is arranged. Heat insulating or heat transfer body according to claim 7, characterized in that at least one channel ( 4 . 5 . 6a . 6b ) has an inner diameter which is smaller than the outer diameter of one in the channel ( 6b ) to be introduced temperature sensor ( 11 . 11 ' ) or one in the channel ( 6a ) reinforcement ( 12 . 12 ' ) or one in the channel ( 4 . 5 ) to be introduced heating element ( 10 . 10 ' ). Heat-insulating or heat-transfer body according to one of the preceding claims, characterized in that the channels ( 4 . 5 . 6a . 6b ) have different inner diameter and / or outer diameter. Heat-insulating or heat-transfer body according to one of the preceding claims, characterized in that on the outer surface of the heat-insulating or heat-transfer body ( 1 ) an insulation layer ( 2 ) is provided, and that the heat insulation or heat transfer body ( 1 ) is made of a thermally conductive material.

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