Arrangement in connection with anaesthetic devices

Abstract: The invention relates to an arrangement in connection with anaesthetic devices which comprise at least two module units (1, 2), which are integrated to function together, and data transmission between the module units is carried out by means of a connector arrangement (3), which comprises contact means arranged in both module units (1, 2). To provide a durable connector arrangement at least one of the connector means (3b) is mobile so that when the module units and thereby the contact means (3a, 3b) are moved close to one another, the mobile contact means (3b) moves so that it comes into contact with the contact means (3a) in the other module unit as a result of magnetising force.

Description: The invention relates to an arrangement in connection with anaesthetic devices which comprise at least two module units, which are integrated to function together, and data transmission between the module units is carried out by means of a connector arrangement, which comprises contact means arranged in both module units. Such arrangements are nowadays rather well known in the field of technology related to anaesthetic devices. Anaesthetic devices, such as different monitors used in the control rooms of hospitals for measuring and controlling vital functions and anaesthetic units with monitors and respiration apparatuses used mainly in the surgical wards of hospitals, usually comprise different module units which are integrated to function together in one way or another. Data transmission, e.g. electronic data transmission, between different module units has been implemented on a case by case basis taking into account the user's requirements. The most commonly used solution is a fixed module unit, in which solution the module unit is not meant to be disconnected and the connection is provided by a fixed cable. The drawback associated with this solution is that it is difficult to disconnect the module units from each other, and thus the solution can be applied only to certain devices. If the user needs a mobile module, the typical known solution available is an arrangement consisting of a cable and a box. The drawback associated with this solution is that the arrangement comprises visible cables, which can be in the way, and thus hamper the use of the device in some situations. In the case of the solution comprising a cable and a box, changing and storing of the module units which have to be changed often may sometimes be difficult because of the cable. To eliminate the disadvantages described above a solution in which a connector and a counter-connector are used between module units without an intermediate cable has been developed in the field. Such an arrangement implemented e.g. with generally known D connector pairs is quicker and more user-friendly than the arrangements described above, since there is no cable hampering the use. A disadvantage associated with solutions of this kind is that the connector has to be guided to the counter-connector very accurately, whereby rather accurate guiding members are needed between the module units, which easily results in rather expensive solutions. Another disadvantage is that the installation of the connector in the module unit is restricted so that the direction of the connectors has to be the same as the installation direction of the module units, whereby restriction of the motion of the module unit with respect to the installation direction requires precision, and possibly separate springs are needed in the connectors, which also increases costs. A further disadvantage is that uncovered, visible connectors dirty easily, which reduces conductivity of the connection. If the connection described above is not implemented as a floating arrangement for example by using springs, the vibration caused during transportation, for instance, may very easily damage the connector. Further connection arrangements are also known in the field, such as infrared solutions, optical solutions, etc. External interferences, expensive arrangements which take up too much space, etc. constitute disadvantages of these solutions. One known arrangement is shown in U.S. patent 4 451 113. An object of the invention is to provide an arrangement which allows to eliminate the disadvantages of the prior art. This is achieved with the arrangement of the invention, which is characterized in that at least one of the contact means is made mobile by mounting said contact means on a flexible member for movement into and out of the module unit, the flexible member being blased to normally position the mobile contact means within the module unit, and that at least one of the contact means includes a magnetic member such that when the two module units are moved close together, the magnetic force of the magnetic member moves the mobile contact means out of the one module unit against the blas of the flexible member and into contact with the other contact means arranged in the other module unit. An advantage of the invention is, for example, that the connection between the module units is similar to the connection between bayonet joints, whereby the module units can be connected with each other electrically and disconnected from each other over and over again without the contact means of the connector arrangement wearing to a harmful extent. The arrangement of the invention can also be installed in the module unit without restrictions. Furthermore, the arrangement of the invention is hidden, which allows to avoid misuse, and it can be cleaned without interfering with its operation. Another advantage of the invention is that the connector does not require as accurate guiding as those of the prior art. The arrangement of the invention also sustains the vibration caused during transportation well. The arrangement of the invention can be applied in a large variety of devices between different module units. The power transmission capacity of the arrangement of the invention can be adjusted on a case by case basis in a simple manner. In addition, the arrangement of the invention is cheap and can be implemented in a simple manner, while the operational reliability of the arrangement is good. In the following, the invention will be described in greater detail by means of a preferred embodiment illustrated in the accompanying drawings, in which Figure 1 is a schematic side view of the arrangement of the invention when two module units are being connected with each other, and Figure 2 shows the connection of Figure 1 in a situation in which the contact means are in contact with each other. Figures 1 and 2 schematically illustrate a preferred embodiment of the arrangement of the invention. Reference numbers 1 and 2 denote two module units of which module unit 1 is the vaporiser casing of an anaesthetic unit and module unit. 2 is an anaesthetic vaporiser cassette. The module units 1 and 2 are shown only partially in Figures 1 and 2, since the structure and operation of the units in question is conventional .technology to one skilled in the art, which will not be described more closely in this context. The module units are integrated to function together, and data transmission between the module units is carried out by means of a separate connector arrangement 3. The connector arrangement 3 according to the arrangement shown in the figures comprises fixed contact means 3a arranged in one module unit 2 and mobile contact means 3b arranged in the other module unit 1. When the module units 1 and 2 and thereby the contact means 3a, 3b are moved close to one another, the mobile contact means 3b moves so that it comes into contact with the immobile contact means 3a as a result of magnetising force. In practice, the module units 1, 2 are usually moved close to each other in such a manner that one module unit 1, the vaporiser casing of the anaesthetic unit in the example of the figures, is stationary, and the other module unit 2, the anaesthetic vaporiser cassette, is moved so that it comes into contact with the module unit 1. Arrow N in Figure 1 illustrates the movement of the module unit 2 in relation to the module unit 1 when they are connected to each other. The basic idea is that when the module unit 1 moves in the direction of arrow N so that the contact means 3a, 3b come close enough to each other, magnetising force pulls the mobile contact means 3b into contact with the immobile contact means 3a. This situation is illustrated in Figure 2. The magnetising force can be generated e.g. with a magnet member 4 arranged in the mobile contact means 3b and magnetic material, such as a magnetic metal, arranged in the immobile contact means 3a. If the reaction distance L of the connector arrangement is to be increased, a magnet member can also be arranged in the immobile contact means 3a, e.g. in the space 5. In the example of the figures the direction of motion S of the mobile contact means is transverse to the direction of motion N of the module unit 2. An advantage of the solution is, for example, that when the contact is created, the contact surfaces rub against each other for a moment, since the module unit 2 moves in direction N. This keeps the contact surfaces clean. Naturally, the invention can also be implemented so that the direction of motion of the moving contact means is parallel with the direction of motion N of the module unit 2. In the example of the figures the contact means 3b are supported by means of a flexible member 8, which gives away while magnetising force pulls the mobile contact means 3b into the position shown in Figure 2. When the module unit 2 is pulled away, i.e. moved in a direction transverse to direction N, the contact surfaces rub against each other until they are disconnected, and the flexible means 8 pull the mobile contact means 3b back to the position shown in Figure 1. Any appropriate means, e.g. a thin circuit card, can function as the flexible means 8. Information, e.g. electronic information, can be transmitted to and from the fixed contact means 3a by means of a cable 6, for example. Correspondingly, electronic information can be transmitted to or from the mobile contact means by means of a cable 7, for example. The contact surfaces are naturally made of a material that conducts electricity. If necessary, the contact means 3b can be provided with a protection 9 against contact, which prevents a short circuit. The embodiment described above is not intended to restrict the invention in any way, but the invention may be modified quite freely within the scope of the claims. It is thus clear that the arrangement of the invention or its details need not be identical to the those shown in the figures, but other solutions are also possible. In the example of the figures, the fixed contact means is arranged in the mobile module unit and the mobile contact means is arranged in the stationary module unit. This is, however, not the only alternative. The fixed contact means may also be arranged in the stationary module unit and the mobile contact means in the mobile module unit. It is also obvious that both module units can be units which are mobile in relation to each other, etc. Within the scope of the invention it is also possible to arrange both contact means so that they are mobile. In such applications the contact means can be arranged so that they do not move or are not released until the mobile module unit has moved into a certain position with respect to the immobile module unit. The contact means can be arranged to lock and to be released for example with mechanical means, which are guided on the basis of the position of the mobile module unit. Even though the invention has been described above in connection with an embodiment utilizing electronic data transmission, the invention is not limited to that application in any way. The invention can also be applied in connection with optical data transmission, for example.

Claims: A connector arrangement in combination with anaesthetic devices having at least two module units (1,2) integrated to function together, wherein data transmission between the module units (1,2) is carried out by the connector arrangement comprising contact means arranged in both module units (1,2), characterized in that at least one of the contact means (3a, 3b) is made mobile by mounting said contact means (3b) on a flexible member (8) for movement into and out of the module unit (1), the flexible member (8) being biased to normally position the mobile contact means (3b) within the module unit (1), and that at least one of the contact means (3a,3b) includes a magnetic member (4) such that when the two module units (1,2) are moved close together, the magnetic force of the magnetic member (4) moves the mobile contact means out of the one module unit (1) against the bias of the flexible member (8) and into contact with the other contact means (3a) arranged in the other module unit (2). An arrangement as claimed in claim 1, characterized in that one of the contact means (3a,3b) is fixed. An arrangement as claimed in any one of claims 1 or 2 characterized in that the motion of the mobile contact means (3b) is provided by means of magnet members (4) arranged in both contact means (3a, 3b). An arrangement as claimed in any one of claims 1 to 3, characterized in that one module unit (1) is the vaporiser casing of an anaesthetic unit and the other module unit (2) is an anaesthetic vaporiser cassette. An arrangement as claimed in any one of claims 1 to 4, characterized in that the contact means (3a, 3b) are arranged to transmit electronic information. An arrangement as claimed in any one of claims 1 to 4, characterized in that the contact means (3a, 3b) are arranged to transmit optical information.

Inventors: KANKKUNEN JUKKA, KANKKUNEN, JUKKA
Applicants: INSTRUMENTARIUM CORP, INSTRUMENTARIUM CORPORATION
Application year: 1998
Main classification: H01R13
IPC codes: A61M16, H01R13