Abstract:
In order to improve a holding device for an implant, comprising a first connecting device for releasably connecting the holding device and the implant, such that very small implants, in particular, are easy to handle, it is suggested that the holding device have a second connecting device for releasably connecting the holding device and a storage unit.

Description:
[0001]    The present disclosure relates to the subject matter disclosed in German patent application No. 10 2007 015 154.5 of Mar. 22, 2007, which is incorporated herein by reference in its entirety and for all purposes. 
       BACKGROUND OF THE INVENTION 
       [0002]    The present invention relates to a holding device for an implant, comprising a first connecting device for releasably connecting the holding device and the implant. 
         [0003]    The present invention also relates to a storage unit for accommodating and/or securing at least one holding device for an implant in place, wherein the holding device comprises a first connecting device for releasably connecting the holding device and the implant. 
         [0004]    A holding device of the type described at the outset is known, for example, from U.S. Pat. No. 6,929,646 B2. This holding device has an elongated handle portion, with the aid of which an implant connected to the handle portion can be brought into a desired implanting position and location relative to a body part to be operated. After the implant has been attached to the body part, the handle portion can be separated from the implant. 
         [0005]    It has been shown that the organization and handling of, in particular, very small implants is a problem. These implants differ from one another, at times, only very slightly but must be made available in numerous variations for a specific operation so that a surgeon can decide during the course of an operation which of the implants altogether available should be used. In some countries it is, in addition, necessary to document exactly what and how many implants have been used during the course of an operation. 
         [0006]    It would, therefore, be desirable to make a holding device and a storage unit of the type described at the outset available, with which very small implants, in particular, are easy to handle. 
       SUMMARY OF THE INVENTION 
       [0007]    In the case of a holding device of the type described at the outset, it is suggested that the holding device have a second connecting device for releasably connecting the holding device and a storage unit. The holding device therefore makes it possible, with the aid of a first connecting device, to secure an implant or several implants releasably in place on the holding device. With the aid of the second connecting device of the holding device, this can be releasably connected to a storage unit. The holding device of a further development enables a separate holding device to be made available for each implant or for a group of implants so that each implant or each group of implants can be handled more easily with the aid of the associated holding device. The holding devices may be connected to the storage unit such that the implants can be clearly arranged and can be handled together with the aid of the storage unit. 
         [0008]    The first connecting device and the second connecting device can preferably be actuated independently of one another. As a result, an implant can be connected to the holding device with the aid of the first connecting device and be released from the holding device in that the first connecting device is actuated. This actuation is independent of whether the holding device is connected to the storage unit with the aid of the second connecting device or is released from it. In a corresponding manner, the second connecting device can be actuated in order to connect the holding device to the storage unit or release the holding device from the storage unit without this having any influence on the first connecting device and, therefore, on the connection between an implant and the holding device. 
         [0009]    The first connecting device can preferably be transferred from a first connecting position, in which an implant can be or is connected to the holding device, into a first release position, in which the holding device releases the implant. As a result, the implant can be fixed reliably on the holding device in the first connecting position of the first connecting device and be removed from the holding device in a simple manner in the first release position of the first connecting device. 
         [0010]    The first connecting device is preferably designed in such a manner that a first releasing force is required to transfer the first connecting device from the first connecting position into the first release position. The first releasing force defines the resistance which must be overcome for separation of the implant from the holding device. It is recommended that a releasing force be provided which is so great that an implant cannot be unintentionally detached from the holding device, for example, when the holding device is subject to slight shaking during transport. On the other hand, the first releasing force should be small enough for an implant to be releasable from the holding device manually or with the aid of a removing tool. 
         [0011]    The holding device preferably comprises a first restoring device which transfers the first connecting device from the first release position into the first connecting position. A preferential position of the first connecting device can be defined with the aid of the first restoring device and this corresponds to the first connecting position. This preferential position can be taken up independently of whether an implant is held in the holding device or not. 
         [0012]    It is favorable when the second connecting device can be transferred from a second connecting position, in which the holding device can be or is connected to the storage unit, into a second release position, in which the holding device can be released from the storage unit. In this way, the holding device can be secured reliably on the storage unit in the second connecting position of the second connecting device and so the holding device itself does not have to be handled but rather it can be handled with the aid of the storage unit. The holding device can be released from the storage unit in the second release position of the second connecting device so that the holding device can be handled independently of the storage unit. 
         [0013]    The second connecting device is preferably designed in such a manner that a second releasing force is necessary to transfer the second connecting device from the second connecting position into the second release position. This second releasing force should be great enough to avoid any unintentional release of the holding device from the storage unit. The second releasing force should, on the other hand, be small enough to be able to remove the holding device from the storage unit preferably without the aid of tools. 
         [0014]    In addition, it is preferred when the holding device comprises a second restoring device which transfers the second connecting device from the second release position into the second connecting position. A preferential position of the second connecting device can be defined with the aid of the second restoring device and this corresponds to the second connecting position. In this respect, a transfer into this preferential position can be carried out independently of whether the holding device is connected to the storage unit or not. 
         [0015]    It is particularly preferred when the first releasing force and the second releasing force differ from one another according to amount and/or direction. As a result, any unintentional, simultaneous actuation of the first connecting device and the second connecting device can be avoided. It is, therefore, ensured that when the first releasing force is applied only the first connecting device is brought from the first connecting position into the first release position without this having any influence on the state of the second connecting device. In a corresponding manner, when the second releasing force is applied this causes a transfer of the second connecting device from the second connecting position into the second release position without this influencing the state of the first connecting device. 
         [0016]    It is particularly preferred when the first releasing force and the second releasing force are linearly independent of one another. This makes it possible to decide, by selecting the corresponding release direction, whether the first connecting device is intended to be brought from the first connecting position into the first release position or whether the second connecting device is intended to be brought from the second connecting position into the second release position. As a result of the first and second release directions being linearly independent, it is possible to rule out that either of the two connecting devices will be brought from its connecting position into its release position in an unintentional manner. This applies irrespective of whether the first releasing force is smaller, the same as or greater than the second releasing force. 
         [0017]    In addition, it is preferred when the first releasing force is smaller than the second releasing force. This makes it possible to adjust the releasing forces such that even when the releasing forces are intended to be oriented in the same direction the first connecting device will be brought, first of all, from the first connecting position into the first release position and then the second connecting device will be brought from the second connecting position into the second release position. 
         [0018]    The first connecting device is preferably designed in such a manner that the implant can be handled in a first handling direction during movement from a first holding position, in which the implant is connected to the holding device, into a first release position, in which the implant is released from the holding device. With the handling direction it is possible to determine the direction, in which a surgeon must handle the implant in order to separate it from the holding device. 
         [0019]    Furthermore, the second connecting device is preferably designed in such a manner that the holding device can be handled in a second handling direction during movement from a second holding position, in which the holding device is connected to the storage unit, into a second release position, in which the holding device is released from the storage unit. With the aid of the second handling direction it is possible to define the direction, in which the holding device must be handled in order to separate it from the storage unit. 
         [0020]    It is particularly preferred when the first handling direction and the second handling direction are linearly independent of one another. When a surgeon releases an implant from the holding device in accordance with the first handling direction, any release of the holding device at the same time from the storage unit is precluded as a result of the linear independence of the handling directions. It is ensured in a corresponding manner that when the second handling direction is chosen to release the holding device from the storage unit an implant possibly connected to the holding device will not be released from the holding device. 
         [0021]    It is particularly preferred when the first handling direction and the second handling direction are at right angles or essentially at right angles to one another. This makes a particularly simple handling of the implant, the holding device and the storage unit possible, with which any unintentional release of the implant from the holding device and any unintentional release of the holding device from the storage unit is precluded. 
         [0022]    The holding device preferably defines a holding axis which predetermines the position and/or the location of the implant when it is connected to the holding device. In this way, it is possible to define an absolute spatial position and/or spatial location of an implant when the holding device is connected to a storage unit. 
         [0023]    It is particularly preferred when the holding axis and the first handling direction are at right angles or essentially at right angles to one another. This makes a particularly simple and gentle transfer of the implant from the first holding position into the first release position possible. 
         [0024]    It is favorable when the holding axis and the second handling direction are parallel or essentially parallel to one another. This makes a space-saving arrangement of the implant on the holding device and of the holding device on the storage unit possible. 
         [0025]    The first connecting device preferably comprises at least one holding element which is designed to connect the implant to the holding device in the first connecting position of the first connecting device. Such a holding element can make only a one-time transfer of the first connecting device from the first connecting position into the first release position possible. Such a holding element can also make a change between the first connecting position and the first release position possible many times. 
         [0026]    It is favorable when the at least one holding element is tongue-shaped. This makes an elastic movement of the holding element between the first connecting position and the first release position possible. 
         [0027]    In addition or optionally, the at least one holding element can also be in the shape of a circular segment. As a result of this, implants, which have implant sections which are shaped in accordance with the circular segment shape of a holding element, may be connected to the holding device in a particularly reliable manner. A holding element in the shape of a circular segment can, in addition and where applicable, prevent any release of the implant from the holding device in a direction deviating from the first handling direction. 
         [0028]    It is preferable when the at least one holding element can be moved and/or deformed within a holding plane. As a result of the movability and/or deformability of the at least one holding element within the holding plane, the amount of the first releasing force which is necessary for the transfer of the first connecting device from the first connecting position into the first release position can be defined in a particularly exact manner. 
         [0029]    The holding plane is preferably at right angles or essentially at right angles to the holding axis. This makes it possible, in particular, in the case of an essentially elongated implant, for example, a bone screw to release this from the holding device in a first handling direction which is at right angles to the holding axis. As a result of this, it is possible for the implant and the holding device to be subjected to only a minimal frictional contact during transfer of the implant from the first holding position into the first release position. 
         [0030]    It is favorable when the first connecting device has at least two holding elements. This makes it possible to introduce the first releasing force, which is required for transfer of the first connecting device from the first connecting position into the first release position, into at least two holding elements which are moved and/or deformed during the specified transfer. In this way, the mechanical load on the individual holding elements can be minimized. 
         [0031]    The at least two holding elements can preferably be moved in opening directions opposite to one another in order to transfer the first connecting device from the first connecting position into the first release position. In this way, the first releasing force can be distributed uniformly onto the at least two holding elements. 
         [0032]    In addition, it is preferable when the at least two holding elements can be moved in closing directions opposite to one another in order to transfer the first connecting device from the first release position into the first connecting position. This makes a gentle and self-centering transfer of the implant from the first release position into the first holding position possible. 
         [0033]    It is particularly preferred when at least one holding element builds up a first restoring force, with which the first connecting device can be transferred back into the first connecting position, in order to form the first restoring device during transfer of the first connecting device from the first connecting position into the first release position. This can be ensured, for example, by selecting a corresponding material, for example, plastic so that the holding element is elastically deformable and can build up a first restoring force during deflection out of a basic position which corresponds to the first connecting position. As a result of this, a particularly simple construction of the first restoring device is ensured. 
         [0034]    It is favorable when the at least one holding element limits an implant receptacle for accommodating the implant. As a result, the holding element contributes to an exact positioning of an implant on the holding device. 
         [0035]    It is, in addition, favorable when the implant receptacle has an undercut. This makes a particularly reliable connection of the implant and the holding device possible. 
         [0036]    It is advantageous when the implant receptacle is fully enclosed on its circumferential side. This makes a particularly reliable fixing of the implant to the holding device possible. 
         [0037]    It is favorable when the first connecting device comprises at least one contact element which can abut on the implant in a tensioned manner in the first connecting position of the first connecting device. It is possible in a particularly simple manner with such a contact element for an implant to be secured in place on the holding device free from clearance without the first connecting device of the holding device needing to meet high tolerance requirements. 
         [0038]    The contact segment advantageously limits the implant receptacle. As a result of this, a compact holding device can be created which makes a clearance-free connection of the holding device and implant possible. 
         [0039]    It is advantageous when the at least one contact element is in the shape of a circular segment. Such a contact element may abut on a curved implant section particularly well, providing contact over a large surface area. 
         [0040]    It is particularly preferred when the holding device has an indicating device which indicates an at least one-time transfer of the first connecting device from the first connecting position into the first release position. Such an indicating device makes it possible to ascertain without any doubt that an implant was connected to the holding device and has been released from the holding device. It can be concluded from this that this implant has been used during the course of an operation. This implant can be allocated with the aid of that holding device, the indicating device of which indicates the transfer of the first connecting device from the first connecting position into the first release position. It is understood that the indicating device described can also be provided in the case of holding devices which have only a first connecting device for releasably connecting the holding device and an implant and no second connecting device for releasably connecting the holding device and a storage unit. 
         [0041]    The indicating device preferably comprises at least one indicating element which can be destroyed and/or plastically deformed during transfer of the first connecting device from the first connecting position into the first release position. This makes a particularly simple configuration of the indicating device possible. 
         [0042]    It is preferred when the indicating device has at least one connecting section for the connection of at least two indicating elements and/or for the connection of the at least one indicating element to an additional part of the holding device, wherein the connecting section can be severed during transfer of the first connecting device from the first connecting position into the first release position. This makes a particularly simple construction of the indicating device possible. The connecting section can comprise, in particular, a predetermined breaking point or be formed by a predetermined breaking point. 
         [0043]    It is favorable when the at least one indicating element is of a tape-like shape. This makes destruction and/or plastic deformation of the indicating element possible with the aid of relatively small destruction and/or deforming forces. 
         [0044]    It is advantageous when the at least one indicating element has element sections which are movable relative to one another and extend in planes angled in relation to one another. In this way, the triggering force required for triggering the indicating device can be adjusted particularly well. 
         [0045]    The at least one indicating element is favorably formed by a holding element. This makes a particularly simple construction of the holding device possible. In addition, it is ensured in a particularly reliable manner that the indicating device is also triggered when the first releasing force is applied in order to transfer the first connecting device from the first connecting position into the first release position. 
         [0046]    It is favorable when the holding device comprises a plate-like basic member. The basic member makes a particularly compact configuration of the holding device possible. 
         [0047]    It is preferred when the basic member extends in the holding plane. This makes a space-saving arrangement of the holding elements on the basic member possible. 
         [0048]    In addition, it is preferred when the basic member extends at right angles or essentially at right angles to the holding axis. This makes a space-saving arrangement of an implant on the holding device possible as well as a space-saving arrangement of the holding device on the storage unit. 
         [0049]    It is favorable when the at least one holding element and/or the at least one contact element and/or the at least one indicating element is or are arranged on the basic member. As a result of this, a particularly compact holding device can be created. 
         [0050]    The at least one holding element and/or the at least one contact element and/or the at least one indicating element is or are preferably designed in one piece with the basic member. This makes a particularly inexpensive production of the holding device possible. 
         [0051]    The holding device preferably comprises a data storage device for storing implant data. This makes a clear allocation of an implant connectable to the holding device and of the holding device possible. The implant data can relate, for example, to a producer, an article number, a batch number and/or to other properties of the implant. By reading the data storage device it is possible to be able to trace the implant data even when the implant has already been detached from the holding device. This makes it easier to trace which implant has been used during the course of an operation. 
         [0052]    It is favorable when the data storage device is connected non-detachably to the holding device. This makes the allocation of the implant data to an implant connected to the holding device or detached from the holding device easier. 
         [0053]    It is advantageous when the data storage device is writable several times. This makes it possible for the holding device to be used for different implants or for a group of different implants. 
         [0054]    It is particularly preferred when the data storage device is designed to display the implant data in the form of an optical data storage device. This makes an optical identification of very small implants, in particular, possible which have, where applicable, no surface area which is large enough to display implant data. 
         [0055]    It is favorable when the implant data are present in an alphanumeric form, as a barcode and/or as a matrix code. As a result, the implant data can be read directly without the aid of additional devices and/or can be detected easily, for example, with the aid of a scanner. 
         [0056]    It is particularly preferred when the data storage device comprises a visible surface for the display of the implant data. This makes simple reading or scanning of the implant data possible. 
         [0057]    It is particularly preferred when the visible surface is formed on the basic member and so the construction of the holding device is simplified further. 
         [0058]    It is favorable when the implant data are designed to be in one piece with the holding device. As a result of this, a data storage device need not be made available separately. When the holding device is produced, for example, in an injection molding process, the implant data can be provided during the same production procedure as a result of corresponding configuration of the injection mold. 
         [0059]    It is advantageous when the data storage device is designed in the form of an electronic data storage device. Such a data storage device makes it possible to store very extensive implant data, as well. 
         [0060]    It is favorable when the data storage device comprises at least one RFID element. Such an element may be integrated inexpensively into the holding device or arranged on it, for example, by way of injection into a plastic material. In addition, an RFID element can be read without contact with the aid of a suitable reading device for reading the implant data. 
         [0061]    It is favorable when the second connecting device comprises at least one connecting element which is designed to connect the holding device to the storage unit in the second connecting position of the second connecting device. The holding device can be connected reliably to the storage unit and easily detached from the storage unit with the aid of the at least one connecting element. 
         [0062]    It is particularly preferred when the at least one connecting element comprises at least one snap-in element for forming a snap-in connection or is designed as a snap-in element, wherein the snap-in element is or can be brought into engagement interlockingly with the storage unit in the second connecting position of the second connecting device. Such a snap-in element makes a particularly reliable connection of the holding device and the storage unit possible. In addition, the transfer of the second connecting device from the second release position into the second connecting position can take place at the same time as a corresponding snap-in procedure of the snap-in element, whereby a good acoustic and/or optical indication conveys to an operator the fact that the second connecting device has reached its second connecting position. 
         [0063]    The at least one connecting element can preferably be moved and/or deformed within a plane of connection. In this way, a second releasing force, which is possibly required for transfer of the second connecting device from the second connecting position into the second release position, can be defined exactly with respect to amount and/or direction. 
         [0064]    The plane of connection is preferably parallel or essentially parallel to the holding axis of the implant. This makes a particularly simple construction of the second connecting device possible. 
         [0065]    In addition, it is advantageous when the second connecting device has at least two connecting elements. As a result of this, the second releasing force, which is possibly required for transfer of the second connecting device from the second connecting position into the second release position, can be introduced into several connecting elements and so the mechanical load on the individual connecting elements is minimized. 
         [0066]    The at least two connecting elements can preferably be moved in opening directions opposite to one another in order to transfer the second connecting device from the second connecting position into the second release position. This makes a comfortable handling of the holding device possible during the transfer of the second connecting device from the second connecting position into the second release position. 
         [0067]    Furthermore, the at least two connecting elements can preferably be moved in closing directions opposite to one another in order to transfer the second connecting device from the second release position into the second connecting position. This makes a comfortable handling of the holding device possible during the transfer of the second connecting device from the second release position into the second connecting position. 
         [0068]    It is favorable when the at least one connecting element builds up a second restoring force, with which the second connecting device can be transferred back into the second connecting position, for forming the second restoring device during transfer of the second connecting device from the second connecting position into the second release position. This makes a particularly simple construction of the second restoring device possible and this has the effect that the second connecting position of the second connecting device is the preferential position of the second connecting device. 
         [0069]    The at least one connecting element preferably limits an undercut area for the accommodation of a section of the storage unit in the second connecting position of the second connecting device. As a result of this, a particularly reliable connection between the holding device and the storage unit is ensured. 
         [0070]    It is preferred when the undercut area is limited by a contact surface of the basic member. In this way, an additional function associated with the second connecting device can be realized with the aid of the basic member. 
         [0071]    It is advantageous when the second connecting device comprises at least one essentially U-shaped material section which has two legs of the U which extend parallel or essentially parallel to the holding axis and are connected to one another via a base of the U. Such a material section makes a simple arrangement and/or realization of at least one connecting element possible. 
         [0072]    The holding axis is favorably arranged between two legs of the U. In this way, the implant can be protected from mechanical influences with the aid of the legs of the U when the implant is connected to the holding device. 
         [0073]    Furthermore, it can be advantageous when the holding axis is arranged outside a space formed between the legs of the U. This makes a particularly compact construction of the second connecting device possible. 
         [0074]    The second connecting device preferably comprises at least one actuating element for transferring the second connecting device from the second connecting position into the second release position. As a result of this, the holding device can be detached from the storage unit in a particularly simple manner. 
         [0075]    The at least one actuating element is preferably designed in the form of a gripping section. As a result of this, the second connecting device can be actuated manually. 
         [0076]    The at least one actuating element is arranged in an advantageous manner at a free end of a leg of the U. This makes a particularly simple transfer of the second connecting device from the second connecting position into the second release position possible. 
         [0077]    Furthermore, the at least one actuating element is preferably arranged on the basic member. As a result of this, the handling of the holding device is made easier. 
         [0078]    It is particularly preferred when at least one actuating element and at least one connecting element of the second connecting device are arranged on oppositely located sides of the basic member when looking along the holding axis of the implant. As a result of this, the second connecting device can be arranged relative to the storage unit in a space in the storage unit which is comparatively difficult to access but is well protected whereas the actuating element can be arranged on the oppositely located side of the basic member so as to be easily accessible. 
         [0079]    The holding device preferably comprises at least one securing device which prevents any implantation of the implant when the implant is connected to the holding device. This has the advantage that an implant which is connected to the holding device cannot be used unintentionally together with the holding device during the course of an operation on a body part to be operated. 
         [0080]    It is particularly favorable when the securing device comprises at least one securing section spaced from the holding axis. This makes it possible to protect a functional area of the implant, for example, a threaded section with the aid of the securing section so that this functional area cannot be brought into engagement with a body part to be operated. 
         [0081]    The securing section is preferably arranged at an angle relative to the basic member, in particular, at right angles or essentially at right angles. This makes a particularly compact construction of the holding device possible. It is, in addition, favorable when the securing section is essentially C-shaped in a cross section at right angles to the holding axis. This allows a functional area of an implant to be protected over a particularly large surface area. In addition, the securing device allows an extensive mechanical protection of the implant. 
         [0082]    In cross sections at right angles to the holding axis, the securing section is preferably larger in an area adjacent to the basic member than in an area removed from the basic member. This makes a particularly simple positioning of the holding device on the storage unit possible. In this respect, the holding device can be brought closer to the storage unit, first of all, with its area removed from the basic member and then be brought into abutment on the storage unit with the area adjacent to the basic member. 
         [0083]    The securing section is favorably formed by the U-shaped material section of the second connecting device. As a result of this, it is possible to dispense with a separate securing section. With the aid of the base of the U of this material section, an implant connected to the holding device can also be protected against mechanical influences in a direction parallel to the holding axis. 
         [0084]    It is favorable when the holding device has a guiding device, with which the holding device can be positioned relative to the storage unit. This makes the handling of the holding device easier when the holding device is connected to the storage unit. 
         [0085]    It is favorable when the guiding device has at least one guiding section which is designed to abut on a section of the storage unit. The guiding section can be formed by parts of the holding device which have already been described, for example, by parts of the second connecting device and/or by a securing section of the securing device. The guiding device can, however, also have in addition or optionally at least one separate guiding section. 
         [0086]    When the holding device comprises at least one implant, a structural module can be made available which can be connected to a storage unit. This structural module can be made available for an operation and sterilized again when not used and made available for the next operation. 
         [0087]    Furthermore, it is suggested for a storage unit of the type described at the outset that the holding device have a second connecting device for releasably connecting the holding device and the storage unit. The storage unit makes the handling of at least one holding device easier and, therefore, also the handling of a very small implant, in particular, which is possibly connected to the holding device. It is particularly advantageous when the storage unit allows accommodation and/or securing in place of several holding devices. 
         [0088]    It is preferred when the storage unit is designed for an orientation of at least two holding devices identical to one another. In this way, it is easier to find a specific holding device and, therefore, a specific implant. 
         [0089]    Furthermore, it is preferred when the storage unit is designed for an orderly arrangement of at least three holding devices. This also makes it easier to find specific holding devices and specific implants. 
         [0090]    A particularly neat arrangement of the holding device is achieved when the storage unit is designed for an arrangement of the holding devices in rows or columns. This makes a space-saving arrangement of several holding devices on the storage unit possible, in addition. 
         [0091]    It is favorable when the storage unit comprises at least one receptacle for accommodating and/or securing at least one holding device in place. The relative position and/or location of the holding device relative to the storage unit can be defined with the aid of the receptacle. 
         [0092]    It is particularly preferred when the at least one holding device can be inserted into the at least one receptacle at least in sections. As a result of this, the holding devices can be arranged on the storage unit in a space-saving manner and reliably connected to it. 
         [0093]    The storage unit preferably comprises a plate for forming or for the arrangement of the at least one receptacle. This makes an inexpensive production of the storage unit possible which can, in addition, be cleaned particularly well. 
         [0094]    The at least one receptacle is preferably limited by a section of the plate which can be connected to the second connecting device of the holding device. As a result of this, a storage unit which is constructed in a particularly simple manner can be created. 
         [0095]    It is favorable when the receptacle has a cross section which predetermines the rotary position of a holding device about its holding axis relative to the storage unit. In this way, the rotary position of the holding device can be predetermined and so the ease, with which this holding device and, therefore, a specific implant can be found, is improved. 
         [0096]    It is particularly favorable when the at least one receptacle has a cross section in the form of an elongated hole. As a result of this, a preferential orientation of the holding device relative to the storage unit can be predetermined in a simple manner. 
         [0097]    It is advantageous when the receptacle has at least one storage element projecting from the plate for connecting the storage unit to the second connecting device of a holding device. A particularly reliable connection between the holding device and the storage unit can be provided with the aid of such a storage element. 
         [0098]    It is favorable when the storage unit has at least one spacer device which spaces the plate in relation to a mounting surface for the storage unit. This makes it possible to create a distance between the plate and the mounting surface, in which at least sections of the holding devices and/or the implants can be arranged without them coming into contact with the mounting surface. 
         [0099]    It is preferred when the spacer device comprises a frame extending along the edge of the plate at least in sections. As a result of this, the storage unit can be placed on the mounting surface in a manner particularly secure against any tilting. When the frame extends along the entire edge of the plate, a space extending between the plate of the storage unit and the mounting surface, in which holding devices can be arranged at least in sections, is protected particularly well from mechanical influences. 
         [0100]    A structural module consisting of a storage unit with at least one holding device makes it possible for holding devices and/or implants required for a specific operation to be made available in an orderly manner and without additional preparation steps. This structural module can be replenished after an operation, sterilized and made available for a subsequent operation. 
         [0101]    The following description of preferred embodiments of the invention serves to explain the invention in greater detail in conjunction with the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0102]    These show: 
           [0103]      FIG. 1 : a perspective view of a storage unit and a plurality of holding devices which are connected to the storage unit or released from it as well as a plurality of implants which are each connected to a holding device; 
           [0104]      FIG. 2 : a perspective view of a holding device according to a first embodiment; 
           [0105]      FIG. 3 : an exploded view of the holding device according to  FIG. 2 , an implant as well as a section of the storage unit according to  FIG. 1 ; 
           [0106]      FIG. 4 : a perspective view of the parts illustrated in  FIG. 3 , wherein the implant is releasably connected to the holding device, wherein the holding device is releasably connected to the storage unit; 
           [0107]      FIG. 5 : a view corresponding to  FIG. 4 , wherein the implant is released from the holding device with the aid of a removing tool; 
           [0108]      FIG. 6 : a perspective view of a holding device according to a second embodiment and a section of the storage unit according to  FIG. 1 ; 
           [0109]      FIG. 7 : a view of the holding device according to  FIG. 6  from a perspective turned through approximately 90° in relation to  FIG. 6 ; 
           [0110]      FIG. 8 : a perspective view of a holding device according to a third embodiment; 
           [0111]      FIG. 9 : a view of the holding device according to  FIG. 8  from a perspective turned through approximately 90° in relation to  FIG. 8 ; 
           [0112]      FIG. 10 : a perspective view of a holding device according to a fourth embodiment; 
           [0113]      FIG. 11 : a view of the holding device according to  FIG. 10  from a perspective turned through approximately 180° in relation to  FIG. 10 ; 
           [0114]      FIG. 12 : a perspective view of a holding device according to a fifth embodiment; 
           [0115]      FIG. 13 : a view of the holding device according to  FIG. 12  from a perspective turned though approximately 120° in relation to  FIG. 12 ; 
           [0116]      FIG. 14 : a perspective view of a holding device according to a sixth embodiment; 
           [0117]      FIG. 15 : a view of the holding device according to  FIG. 14  from a perspective turned through approximately 150° in relation to  FIG. 14 ; 
           [0118]      FIG. 16 : a perspective view of a holding device according to a seventh embodiment; 
           [0119]      FIG. 17 : a view of the holding device according to  FIG. 16  from a perspective turned through approximately 150° in relation to  FIG. 16 ; 
           [0120]      FIG. 18 : a perspective view of a holding device according to an eighth embodiment; 
           [0121]      FIG. 19 : a view of the holding device according to  FIG. 18  from a perspective turned through approximately 90° in relation to  FIG. 18 ; 
           [0122]      FIG. 20 : a perspective view of a holding device according to a ninth embodiment; and 
           [0123]      FIG. 21 : a view of the holding device according to  FIG. 20  from a perspective turned through approximately 150° in relation to  FIG. 20 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0124]    The same or functionally equivalent elements are designated in all the Figures with the same reference numerals. 
         [0125]    In  FIG. 1 , a storage unit which is designed for the arrangement of holding devices for implants is designated altogether with the reference numeral  2 . It has a rectangular plate  4 , the plate thickness of which is a few millimeters. A spacer device designated altogether with the reference numeral  8  extends along the edge  6  of the plate  4 . The spacer device is designed in the form of a frame  10  which comprises four walls  12  arranged in respective pairs at right angles to one another and connected to one another. The walls  12  extend at right angles to the plate  4  and space this from a mounting surface  14 , on which the storage unit  2  is placed. 
         [0126]    The plate  4  has a plurality of receptacles  16  which are each formed by openings provided in the plate  4 . The receptacles  16  are distributed over the plate  4  in a regular manner and arranged in rows  18  which are parallel to one another and columns  20  at right angles thereto. The receptacles  16  are each designed in the form of an elongated hole, wherein the longer cross-sectional axis (without any reference numeral) extends in the direction of the rows  18  and the shorter cross-sectional axis (without any reference numeral) in the direction of the columns  20 . 
         [0127]    The plate  4  has altogether  56  receptacles  16  arranged in seven rows  18  and eight columns  20 . The cross sections  22  of the receptacles  16  are of the same size and oriented identically to one another. Each receptacle  16  is limited by sections  24  of the plate  4 . More details concerning the function of the sections  24  will be explained further on. 
         [0128]    One of the receptacles  16  illustrated in  FIG. 1  comprises two elongated storage elements  26 . They project from an upper side  28  of the plate  4  and extend in the direction of the rows  18 . The storage elements  26  comprise two storage sections  30  which are spaced from the upper side  28 , extend parallel to the plate  4  and limit storage areas  32  extending in the direction of the rows  18  together with the upper side  28  of the plate  4 . The function of the storage areas  32  will also be explained in detail further on. 
         [0129]    The storage unit  2  serves to accommodate and/or secure in place a plurality of holding devices which can be releasably connected to the receptacles  16  of the plate  4 . In  FIG. 1 , various holding devices are illustrated which are releasably connected to the storage unit  2 , namely holding devices  34  (cf.  FIGS. 4 and 5 ), holding devices  36  (cf.  FIGS. 6 and 7 ), holding devices  38  (cf.  FIGS. 8 and 9 ) and holding devices  40  (cf.  FIGS. 10 and 11 ). In  FIG. 1 , one of the holding devices  38  is illustrated in its state detached from the storage unit  2 . 
         [0130]    Each of the holding devices  34 ,  36 ,  38 ,  40  serves for the arrangement of an implant  42  designed in the form of a screw. Each implant  42  can, as illustrated in  FIG. 1 , be releasably connected to one of the holding devices  34 ,  36 ,  38 ,  40 . 
         [0131]    The holding device  34  comprises a first connecting device  44  for releasably connecting the holding device  34  and an implant  42  as well as a second connecting device  46  for releasably connecting the holding device  34  and the storage unit  2 . 
         [0132]    The holding device  34  defines a holding axis  48 , along which an implant  42  can be arranged when the implant  42  is connected to the holding device  34  and takes up a holding position (cf.  FIG. 4 ). This position of the implant  42  will be designated in the following as first holding position. 
         [0133]    A holding plane  50 , in which an approximately square, plate-like basic member  52  extends, runs at right angles to the holding axis  48 . This basic member has a visible surface  54  on the side located opposite the second connecting device  46 . The basic member  52  has a contact surface  56  on its side located opposite the visible surface  54 . 
         [0134]    The first connecting device  44  comprises an implant receptacle  58  which extends in the area of the holding axis  48  at the height of the holding plane  50 . The implant receptacle  58  is limited by a contact section  60  which is approximately semi-cylindrical and is formed by the basic member  52 . The contact section  60  is adjoined by two holding elements  62  which are tongue-shaped and arranged so as to be located opposite one another. They have at their free ends snap-in projections  64  which face one another. The snap-in projections  64  limit the implant receptacle  58  in such a manner that an undercut results. 
         [0135]    The basic member  52  has elongated spaces  66  and  68 , respectively, on the sides of the respective holding elements  62  facing away from the implant receptacle  58 . The spaces  66  and  68  have the effect that the holding elements  62  may be moved elastically in the holding plane  50 . The holding elements  62  can be moved in an opening direction  70  into the respective spaces  66  and  68 . The holding elements  62  can also each be moved in the direction towards the implant receptacle  58  in closing directions  72  which point towards one another. 
         [0136]    The holding elements  72  are illustrated in  FIG. 2  in a first connecting position of the first connecting device  44 . When the holding elements  72  are deflected out of this first connecting position into the spaces  66  and  68  as a result of a first releasing force being applied, the first connecting device  44  can be transferred into a first release position. During such a transfer of the first connecting device  44  from the first connecting position into the first release position, the holding elements  72  are elastically deformed and deflected into the spaces  66  and  68 . As a result of this, the holding elements  72  each build up a first restoring force which is directed towards the implant receptacle  58 . The first restoring forces have the effect that the holding elements return to the position illustrated in  FIG. 2  of their own accord following deflection into the spaces  66  and  68 . In this way, the holding elements  72  form a first restoring device  73 . 
         [0137]    The basic member  52  comprises a data storage device designated altogether with the reference numeral  74 . In the case of the holding device  34 , the data storage device  74  comprises the visible surface  54  of the basic member  52 . On the visible surface  52 , implant data  76  are arranged which are raised above the visible surface  52  and serve to identify an implant  42  which can be connected to the holding device  34  via the first connecting device  44 . The implant data  76  are alphanumeric. 
         [0138]    The second connecting device  46 , with which the holding device  34  can be connected to the storage unit  2 , comprises a connecting element  78  in the form of a curved snap-in element  80 . Together with the contact surface  56  of the basic member  52 , the snap-in element  80  limits an undercut area  82 , in which a section  24  of the plate  4  of the storage unit  2 , which is also illustrated in  FIGS. 1 ,  3  and  4 , can be arranged. 
         [0139]    The connecting element  78  is illustrated in  FIG. 2  in a second connecting position of the second connecting device  46 . When the connecting element  78  is deformed out of this second connecting position in the direction towards the holding axis  48  as a result of a second releasing force being applied, the first connecting device  44  can be transferred into a second release position. During such a transfer of the second connecting device  46  from the second connecting position into the second release position, the connecting element  78  is elastically deformed. As a result of this, the connecting element  78  builds up a second restoring force which is directed away from the holding axis  48 . This second restoring force has the effect that the connecting element  78  returns back to the position illustrated in  FIG. 2  of its own accord following its deformation in the direction towards the holding axis  78 . In this way, the connecting element  78  forms a second restoring device  81 . 
         [0140]    The holding device  34  comprises a guiding device  84  which has two flat guiding sections  86  which extend parallel to the holding axis  48 . The guiding sections  86  serve to position the holding device  34  relative to a receptacle  16  of the storage unit  2 . 
         [0141]    The holding device  34  comprises, in addition, a securing device  88  which comprises a securing section  90  which is C-shaped in cross sections at right angles to the holding axis  48 . The securing section  90  has two slits  92  which extend parallel to the holding axis  48  and are approximately rectangular. The securing section  90  has, in addition, a free end  94  on its side facing away from the basic member  52 . The cross sections of the securing section  90  at right angles to the holding axis increase in size from this free end, when seen in the direction of the holding axis  48 , as far as the level of two steps  96 . As a result of this, the cross section of the securing device  88  is greater in an area adjacent to the basic member  52  than in an area at a distance from the basic member  52 . 
         [0142]    In  FIG. 3 , the holding device  34  is illustrated with an implant  42 . The implant  42  is in a position released from the holding device  34 . The implant  42  extends along an implant axis  98 . It has a first implant section  100  in the form of a screw head. This is adjoined by a short cylindrical implant section  102 . Finally, the implant  42  has an implant section  104  which is provided with an external thread  106 . The implant  42  can be secured to a body part to be operated with the aid of the external thread  106 . 
         [0143]    In order to connect the implant  42  to the holding device  34 , the implant section  102  of the implant  42  can be positioned at the level of the holding plane  50  to the side in relation to the holding device  34 . This position of the implant  42  is designated in the following as first release position. The implant  42  can be moved from this position into the implant receptacle  58  within the holding plane  50  in a connecting direction which is designated as  108  and is at right angles to the holding axis  48 . In this respect, the holding elements  62  are moved away from one another by the implant section  102  in opening directions  70  opposite to one another until the snap-in projections  64  engage interlockingly around the implant section  102  (cf.  FIG. 4 ). 
         [0144]    When the implant  42  takes up its first holding position on the holding device  34 , which is illustrated in  FIG. 4 , the implant section  100  extends beyond the visible surface  54  of the basic member  52 . The implant section  102  is held in the implant receptacle  58 . The implant section  104  is surrounded by the securing section  90  C-shaped in cross section at right angles to the holding axis  48 . 
         [0145]    The holding device  34  can be brought from a second release position illustrated in  FIG. 3  into a position illustrated in  FIG. 4 , in which the holding device  34  is connected to the storage unit  2 . This position of the holding device  34  is designated in the following as second holding position. 
         [0146]    In order to bring the holding device  34  into the second holding position proceeding from the second release position, the free end  94  of the securing section  90  of the holding device  34  can be introduced into one of the receptacles  16  of the plate  4  of the storage unit  2 . In this respect, the holding device  34  is moved in a connecting direction designated in  FIG. 3  with the reference numeral  110  until the snap-in element  80  engages interlockingly behind the section  24  of the plate  4  and the contact surface  56  of the basic member  52  abuts on the upper side  28  of the plate  4  (cf.  FIG. 4 ). 
         [0147]    In  FIG. 4 , the first connecting device  44  is in the first connecting position. The implant  42  is connected to the holding device  34  and is in the first holding position. 
         [0148]    In  FIG. 4 , the second connecting device  46  is in the second connecting position. The holding device  34  is connected to the storage unit  2  and is in the second holding position. 
         [0149]    The arrangement illustrated in  FIG. 4  makes it easy for a surgeon to handle the implant  42  since it is connected to the holding device  34  and this is, on the other hand, connected to the storage unit  2 . In this respect, the implant  42  can be identified clearly with the aid of the data storage device  74 . 
         [0150]    In order to bring the implant  42  from its first holding position illustrated in  FIG. 4  into the first release position illustrated in  FIG. 5 , a removing tool  112  can be used. The removing tool  112  has a tool head  114  which is designed to engage around the implant section  104 . The removing tool  112  can be formed by a screwdriver which can also be used for screwing the external thread  106  of the implant  42  into a body part to be treated. 
         [0151]    In order to bring the first connecting device  44  from its first connecting position illustrated in  FIG. 4  into the first release position, the removing tool  112  can be moved such that the implant  42  is handled in a first handling direction, which is designated in  FIG. 5  as  116 , in a direction at right angles to the holding axis  48  so that the implant section  102  is moved out of the implant receptacle  58  within the holding plane  50 . In this respect, a first releasing force must be applied and this is determined by the resistance of the holding elements  62  which move within the holding plane  50  in opening directions  70  (cf.  FIG. 3 ) into the adjoining spaces  66  and  68  for the release of the implant section  102 . 
         [0152]    As soon as the implant  42  has been moved out of the implant receptacle  58  to such an extent that it takes up the first release position, the implant  42  can be removed from the holding device  34  in a direction parallel to the holding axis  48 . In this respect, the holding device  34  remains on the plate  4  of the storage unit  2 . This is due to the fact that the second connecting device  46  can be actuated independently of the first connecting device  44 . The first connecting device  44  is transferred from the first connecting position into the first release position by the first releasing force being applied. In this respect, the second connecting device  46  remains in the second connecting position illustrated in  FIGS. 4 and 5  and so the holding device  34  remains connected to the storage unit  2 . 
         [0153]    In order to transfer the second connecting device  46  into the second release position so that the holding device  34  can be released from the storage unit  2 , the holding device  34  can be handled in a handling direction  118  in a direction parallel to the holding axis  48  and moved out of the receptacle  16  of the plate  4 . For this purpose, a pressure force can be applied, for example, from the free end  94  of the securing section  90  in the direction of the second handling direction  118 . As a result of this, a second releasing force can be applied which deforms the connecting element  78  in the direction of the holding axis  48  whilst abutting on the section  24  of the plate  4  so that the second connecting device  46  is transferred from the second connecting position into the second release position. As a result of this, the holding device  34  can be released from the plate  4 . 
         [0154]    The first handling direction  116  and the second handling direction  118  extend at right angles to one another. It is understood that the transfer of the first connecting device  44  from the first connecting position into the first release position can be aided by tilting of the implant  42  through an angle of tilt  120  relative to the holding axis  48 . In this case, the first handling direction  116  and the second handling direction  118  can be oriented at an angle to one another which corresponds to a right angle plus the angle of tilt  120 . 
         [0155]    The holding device  36  illustrated in  FIGS. 6 and 7  has a construction similar to that of the holding device  34 . In the following, only the differences between the holding devices  34  and  36  will be explained in detail. In contrast to the holding device  34 , the holding device  36  has not only a connecting element  78  in the form of a curved snap-in element  80  but also two connecting elements  122  and  124  which are arranged opposite one another. They extend parallel to the holding axis  48  and are connected to the securing section  90  at the free end  94  of the holding device  36 . 
         [0156]    The connecting elements  122  and  124  each have a snap-in element  126  and  128 , respectively, at their ends facing the basic member  52  of the holding device  36 . These snap-in elements are arranged at the same level as the snap-in element  80  when seen along the holding axis  48 . The connecting elements  122  and  124  are movable and deformable on their own and also relative to one another within a connecting plane  130  such that the snap-in elements  126  and  128  can be moved towards one another within the connecting plane  130  in opening directions  132  opposite to one another. As a result of this, the second connecting device  46  of the holding device  36  can be transferred from its second connecting position illustrated in  FIG. 6  into the second release position. When the connecting elements  122  and  124  are spaced so near to one another in the area of the snap-in elements  126  and  128  that the snap-in elements  126  and  128  can be disengaged from the section  24  of the plate  4 , the holding device  36  can be brought from the second holding position into the second release position (cf.  FIG. 7 ) in a second handling direction  118  parallel to the holding axis  48 . 
         [0157]    Once the connecting elements  122  and  124  and the snap-in elements  126  and  128  have been disengaged from the receptacle  16  of the plate  4 , the connecting elements  122  and  124  move back again in closing directions  134  opposite to one another of their own accord within the connecting plane  130  such that in the second release position of the holding device  36  the second connecting device  46  is again transferred into the second connecting position. In order to be able to connect the holding device  36  to the storage unit  2  again, the free end  94  of the securing section  90  can be introduced into the receptacle  16  until beveled run-on surfaces  136  and  138  formed by the snap-in elements  126  and  128  engage with the sections  24  of the plate  4 . As a result of this, the connecting elements  122  and  124  are moved towards one another in opening directions  132  so that the second connecting device  46  is transferred into the second release position. The beveled run-on surfaces  136  and  138  are introduced into the receptacle  16  to such an extent that the snap-in elements  126  and  128  engage interlockingly behind the section  24  of the plate  4  and, therefore, the second connecting device  46  again takes up the second connecting position. 
         [0158]    The holding device  38  illustrated in  FIGS. 8 and 9  has a construction similar to that of the holding device  36 . In the following, only the differences between the holding devices  36  and  38  will, therefore, be explained in detail. The connecting elements  122  and  124  of the holding device  38  which extend parallel to the holding axis  48  are not connected to the securing section  90  at the free end  94  thereof but rather via attachments  140  and  142  which are provided adjacent to the connecting element  78 . The snap-in elements  126  and  128  are not designed in the form of projections, as in the holding device  36  according to  FIGS. 6 and 7 , but are formed by edge surfaces of the connecting elements  122  and  124  pointing in the direction towards the contact surface  56  of the basic member  52 . The connecting elements  122  and  124  have, in addition, two edge sections  144  and  146  which are slightly inclined in their course relative to the holding axis  48  and make the introduction of the free end  94  into a receptacle  16  of the plate  4  easier. 
         [0159]    In order to be able to position the holding device  38  exactly relative to a receptacle  16  of the plate  4  of the storage unit  2 , the holding device  38  has guiding sections  148  and  150  which extend parallel to the holding axis  48  proceeding from the contact surface  56  and each abut on a section  24  of the plate  4  in the second holding position of the holding device  38 . The holding device  40  illustrated in  FIGS. 10 and 11  differs, inter alia, from the holding devices  34 ,  36  and  38  described thus far in that it defines a holding axis  48  which does not essentially extend centrally through the basic member  52  but is offset to the side in relation thereto. This has the advantage that a particularly large visible surface  54  results, on which a relatively large number of implant data  76  can be displayed closely adjacent to one another but easy to read. 
         [0160]    The implant receptacle  58  of the holding device  40 , which is limited by two holding elements  62  located opposite one another as well as the contact section  60  of the basic member  52 , is offset to such an extent out of the center of the basic member  52  that the space  68  present in the case of the holding devices  34 ,  36  and  38  is no longer applicable or is formed by the surroundings of the holding device  40 . 
         [0161]    The second connecting device  46  of the holding device  40  comprises, in a similar way to the holding devices  36  and  38 , two connecting elements  122  and  124  extending essentially parallel to the holding axis  48 . In contrast to the holding devices  36  and  38 , the connecting elements  122  and  124  of the holding device  40  are provided separate from the securing section  90  of the securing device. A first connecting element  122  is designed, for example, as a leg  152  of a U which extends parallel to the holding axis  48  proceeding from the contact surface  56  of the basic member  52  as far as the free end  94  of the securing section  90 . Here, the leg  152  of the U merges into a base  154  of the U which extends parallel to the basic member  52  and, therefore, to the holding plane  50 . At its end located opposite the leg  152  of the U the base  154  of the U ends at a leg  156  of the U which forms the connecting element  124 . The legs  152  and  156  of the U and the base of the U together form a U-shaped material section  158 . The leg  156  of the U extends from the base  154  of the U approximately parallel to the holding axis  48  in the direction towards the basic member  52  and—in the area of a free end  160  which is not connected to the basic member  52 —as far as an actuating element  162 . The actuating element  162  is designed in the form of a gripping section. This gripping section and the connecting elements  122  and  124  are arranged on oppositely located sides of the basic member  52  when seen along the holding axis  48 . 
         [0162]    In order to connect the holding device  40  illustrated in  FIGS. 10 and 11  to the storage unit  2  illustrated in  FIG. 1 , the free end  94  of the holding device  40  can be inserted into one of the receptacles  16  of the plate  4 . The second connecting device  46  of the holding device  40  is hereby transferred from the second connecting position into the second release position with deformation of the connecting element  124  in the direction towards the holding axis  48  which corresponds to an opening direction  132 . When the holding device  40  is inserted into one of the receptacles  16  to such an extent that the snap-in elements  126  and  128  can engage interlockingly behind associated sections  24  of the receptacle  16 , the connecting element  124  springs back into the position illustrated in  FIG. 10  in accordance with a closing direction  134  so that the second connecting device  46  is transferred into the second connecting position. 
         [0163]    In order to transfer the second connecting device  46  from the second connecting position into the second release position, the actuating element  162  can be actuated in accordance with the opening direction  132  which extends at right angles to the holding axis  48 . In this respect, the connecting element  124  or rather the leg  156  of the U is deformed within a connecting plane  130  so that the snap-in element  128  can disengage from the associated section  24  of the plate  4 , whereby the second connecting device  46  is transferred into the second release position. In this way, the holding device  40  can be released from the storage unit  2  during its movement in accordance with a second handling direction  118  which extends parallel to the holding axis  48 . 
         [0164]    The legs  152  and  156  of the U of the holding device  40  are arranged on oppositely located sides relative to the holding axis  48 . This has the advantage that an implant  42  connected to the holding device  40  via the first connecting device  44  is protected from mechanical influences not only by the securing section  90  but also with the aid of the U-shaped material section  158 . In this respect, the base  154  of the U shields the implant  42  in relation to the mounting surface  14  illustrated in  FIG. 1  when the holding device  40  is connected to the storage unit  2 . 
         [0165]      FIGS. 12 and 13  illustrate an additional holding device  164 . This likewise comprises a U-shaped material section  158 . In contrast to the holding device  40  according to  FIGS. 10 and 11 , the holding axis  48  of the holding device  164  extends approximately centrally through the basic member  52 . In addition, the holding elements  62  of the first connecting device  44  are oriented in such a manner that their opening and closing directions  70  and  72  do not extend parallel to the opening directions  132  and closing directions  134  of the connecting elements  122  and  124 , as in the case of the holding device  40 , but rather at right angles to one another. 
         [0166]    The holding device  164  has, in addition, an actuating element  166  which is rigidly connected to the basic member  52 , projects beyond the visible surface  54  and extends approximately parallel to the holding axis  48 . The actuating elements  162  and  166  are arranged on oppositely located sides of the holding axis  48  and can be moved relative to one another in the specified opening directions  132  and closing directions  134 , respectively, in order to transfer the second connecting device  46  from the second connecting position into the second release position. 
         [0167]    The basic member  52  has a reduced material thickness in a central section  168 . The central section  168  has a surface  170  which extends parallel to the visible surface  54  of the basic member  52  and is spaced at a smaller distance from the contact surface  56  of the basic member  52  than the visible surface  54 . As a result of this, the surface  170  is set back in comparison with the visible surface  54 . When the holding device  164  is connected to an implant  42  with the aid of its first connecting device  44 , an implant section  100  (cf.  FIG. 3 ) does not extend beyond the visible surface  54  or only slightly. As a result of this, the holding device  164  and an implant  42  can be supplied together to an inscription device, with which implant data  76  can be applied to the visible surface  54  of the holding device  164 , for example, by way of overprinting. 
         [0168]    The holding device  164  illustrated in  FIGS. 12 and 13  differs, in addition, from the holding device  40  illustrated in  FIGS. 10 and 11  in that its U-shaped material section  158  has insertion aids  172  and  174 . The insertion aid  172  comprises an insertion surface  176  extending at a slight angle to the holding axis  48 . The insertion aid  174  is formed by a partially cylindrical transition section between the base  154  of the U and the leg  156  of the U. The insertion aids  172  and  174  make the insertion of the holding device  164  into a receptacle  16  of the storage unit  2  easier. 
         [0169]      FIGS. 14 and 15  illustrate a further holding device  180 . This differs from the holding devices  40  and  164  due to the fact that its U-shaped material section  158  is designed in such a manner that the legs  152  and  156  of the U are immediately adjacent to one another. The holding axis  48  of the holding device  180  extends outside a space  181  formed between the legs  152  and  156  of the U. 
         [0170]    The basic member  52  of the holding device  180  has a recess  182  extending within the holding plane  50 . This creates a space for movement of the leg  156  of the U which can be moved in opening direction  132  or in closing direction  134  with the aid of the actuating element  162 . 
         [0171]    The implant receptacle  58  of the first connecting device  44  of the holding device  180  differs from the implant receptacles of the holding devices  34 ,  36 ,  38 ,  40 ,  164  described thus far in that the holding elements  62  which are located opposite one another are comparatively short. Instead of a rigid contact section  60  (cf.  FIG. 2 ), the implant receptacle  58  of the holding device  180  has contact elements  184  in the shape of circular segments. They are of a lug-shaped design and connected to the basic member  52  at the level of the visible surface  54  thereof. The contact elements  184  extend at an angle in the direction towards the holding axis  48  proceeding from the visible surface  54 . 
         [0172]    When an implant  42  is connected to the holding device  180  with the aid of the first connecting device  44 , the contact elements  184  abut on the implant section  102  (cf.  FIG. 3 ) under tension. As a result of this, the implant  42  is connected to the holding device  180  without any clearance. 
         [0173]    The holding device  180  comprises an indicating device  186 , with which it can be shown whether the first connecting device  44  of the holding device  180  has been transferred from the first connecting position into the first release position at least once. The indicating device  186  comprises two tape-like indicating elements  188  which extend adjacent to the implant receptacle  58  within the holding plane  50 . The indicating elements  188  are connected to one another via a connecting section  190  which forms a predetermined breaking point. 
         [0174]    When an implant  42  connected to the holding device  180  is transferred from a first holding position into a first release position in a direction at right angles to the holding axis  48  in accordance with a first handling direction  116 , this causes destruction of the connection between the indicating elements  188 . As a result of this, it can be clearly ascertained that an implant  42  has already been removed from the holding device  180 . As a result of this, any unintentional re-use of the holding device  180  can also be ruled out. 
         [0175]      FIGS. 16 and 17  illustrate an additional holding device  192  which differs from the holding device  180  according to  FIGS. 14 and 15  only in its configuration of the indicating device  186 . The indicating device  186  of the holding device  192  comprises two element sections  194  and  196  which are arranged at an oblique angle to one another. The element section  194  is articulated to a closed edge  198  of the basic member  52  and extends at an acute angle relative to the visible surface  54  of the basic member  52  in the direction towards the holding axis  48 . The element section  196  extends in the direction towards the holding axis  48  as far as adjacent to the implant receptacle  58  proceeding from the end of the element section  194  facing the holding axis  48 . 
         [0176]    When an implant  42  held on the holding device  192  is transferred from a first holding position into a first release position in a first handling direction  116 , the element sections  194  and  196  are deformed permanently and so it can be shown that the first connecting device  44  of the holding device  192  has been transferred from the first connecting position into the first release position. 
         [0177]    The holding device  200  illustrated in  FIGS. 18 and 19  differs from the holding devices  180  and  192  in its configuration of the first connecting device  44 . This likewise comprises contact elements  184  which are in the shape of circular segments but no essentially tongue-shaped holding elements  62  but rather holding elements  202  which are shaped like circular segments and limit an implant receptacle  58 , which is completely enclosed on its circumferential side and extends within a holding plane  50 , together with the contact elements  184 . The holding elements  202  are connected to one another via a connecting section  190  which forms a predetermined breaking point. 
         [0178]    An implant  42  can be inserted into the holding device  200  in that it is inserted into the implant receptacle  58  in the direction of the holding axis  48  with its implant section  104  (cf.  FIG. 3 ) first. In this respect, the contact elements  184  and the holding elements  202  are deformed radially outwards by the external thread  106  so that the implant section  104  can be introduced into the implant receptacle completely until the implant section  102  is arranged at the level of the contact elements  184  and the holding elements  202  and the contact elements  184  and the holding elements  202  can be reset again radially inwards. The connecting device  44  then takes up the first connecting position. In order to release the implant  42  from the holding device  200 , the first connecting device  44  can be brought from the first connecting position into the first release position in that the implant  42  is moved out of the implant receptacle  58  in a first handling direction designated as  116 . In this respect, the connecting section  190  between the holding elements  202  is destroyed. As a result of this, it can be shown that an implant  42  was already held on the holding device  200  and so any unintentional re-use of the holding device  200  can be ruled out. The holding device  200  therefore likewise comprises an indicating device  186 . With this indicating device, the indicating elements are formed by the holding elements  202 . 
         [0179]      FIGS. 20 and 21  illustrate a further holding device  204 . Its first connecting device  44  has a construction which corresponds, for example, to the construction of the first connecting device  44  of the holding device  34  according to  FIG. 2 . The holding device  204  likewise has a securing section  90  which corresponds in its construction to the securing section  90  of the holding device  40  according to  FIGS. 10 and 11 . 
         [0180]    On the other hand, the second connecting device  46  of the holding device  204  differs from the second connecting devices  46  of the holding devices  34 ,  36 ,  38 ,  40 ,  164 ,  180 ,  192 ,  200  due to the fact that the snap-in elements  126  and  128  are arranged on the side of the connecting elements  122  and  124  facing the holding axis  48 . This causes a reversal of the corresponding opening directions  132  and the closing directions  134 . In addition, an undercut area  82  formed between the snap-in elements  126  and  128  and the contact surface  56  of the basic member  52  is formed between the connecting elements  122  and  124  and not on oppositely located sides. 
         [0181]    The holding device  204  can be connected to the storage unit  2  illustrated in  FIG. 1  in that the securing section  90  of the holding device  204  dips into a receptacle  16  of the plate  4  until the snap-in elements  126  and  128  engage in the storage areas  32  of the storage elements  26 . The second connecting device  46  of the holding device  204  then takes up the second connecting position. 
         [0182]    In order to transfer the second connecting device  46  of the holding device  204  into the second release position, the actuating elements  162  of the connecting elements  122  and  124  can be moved towards one another in actuating directions  206  opposite to one another so that the snap-in elements  126  and  128  are moved away from one another in opening direction  132  and disengage from the storage areas  32  of the storage elements  26 .