the embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description . rather , the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of the present invention . fig1 shows a lancet 1 which consists of a lancet body 2 and at least two lancet tips 3 . in the arrangement shown in fig1 some of the lancet tips 3 are located on one side of the lancet body 2 which is shown here as a rectangle and the remaining lancet tips 3 are located on the opposite side of the lancet body 2 . several hundred lancets can be arranged in such a tape - like structure of the lancet body 2 . up to 100 lancet tips 3 can be arranged on the lancet body which can then , for example , be wound onto a tape . in a further embodiment , up to 6 lancet tips 3 are arranged on the lancet body 2 , in which case the lancet bodies can then be arranged in a stack - like manner in a magazine . if a carrier tape is used to store the lancet tips , it is also possible that the carrier tape serves as the lancet body on which the lancet tips are arranged . this carrier tape can , for example , consist of material or it can also be a metal tape . the means for selection , i . e ., the selection of the lancet length and thus of the lancing depth can in this case be a device element which is used to advance the device in steps . an exactly adjusted mechanism conveys the tape in each stepping operation from one to the next lancet tip . for this purpose the lancet tips must be precisely arranged . at each advance the lancet body is shifted further by one lancet tip . this can be indicated to the user by a counter so that it is always apparent to the user which lancet length is currently being made available for the lancing . in this connection a reversal of the device &# 39 ; s stepping action should be prevented so that a repeated use of a lancet tip is impossible . in fig2 , the lancet tips 3 are arranged at various angles to the lancet bodies 2 . in this case the lancet tips 3 can point in all directions in space . the lancet tips 3 are preferably arranged in one plane so that the lancet 1 can be stored in a stack magazine without damaging the lancet tips . depending on the geometry of the lancet body , up to 10 lancets can be arranged at various angles to the base body in this star - shaped arrangement , preferably there are 4 to 5 lancet tips 3 . the lancet body preferably has a recess / hole 2 a which is provided as a coupling element for coupling to an appropriately designed pusher ( not shown ) of a drive unit . in the example shown , the lancet is rotatably connected to the drive unit so that a desired tip for a lancing process can be selected by means of a rotation of the pusher and thus of the lancet . in this manner , a lancet tip can be selected due to an interaction of the drive unit with the coupling element of the lancet . in one embodiment , the lancet tips 3 have a bending site at their proximal end 3 a which adjoins the lancet body 2 . this bending site enables the lancet tip 3 to be bent out of the plane of the base body and of the remaining lancet tips which enables the desired lancet tip 3 to be selected . in the lancing process the entire lancet 1 is used for the lancing process . fig3 shows a section of a lancet 1 where the lancet tip 3 located on the lancet body 2 has a region with several bending lines 4 a , b , c . the bending line 4 a extends from the distal end 3 b of the lancet tip 3 towards the proximal end 3 a of the lancet tip 3 . in this case this bending line 4 a can extend over the complete tip region for the lancet tip 3 or only over a subregion of the lancet tip 3 . further bending lines 4 b and 4 c can extend laterally from the first bending line towards the proximal end 3 a of the lancet tip 3 . fig4 shows a lancet tip 3 with an integrated microsampler 5 . the lancet tip 3 with an integrated microsampler 5 can be bent by means of a bending line 4 a at the proximal end 3 a of the lancet tip 3 . fig5 shows a special embodiment of the lancet tip 3 with an integrated microsampler 5 where there are several bending lines 4 a , 4 b and 4 c as in fig3 . fig6 shows a system with a carrier tape 10 which is wound onto two different rolls 11 a and 11 b where one of the rolls 11 a can contain unused lancets 1 or test elements 13 whereas roll 11 b stores used lancets 1 or test elements . the system can additionally have a bending element 12 which , after selecting the appropriate lancing tip 3 , bends the lancet . in this case the bending element 12 serves as the selection means 16 . in addition the system can contain an optical system 14 as well as means for driving the lancet such as a pusher 15 . the optical system 14 can also be used as a selection means 16 when it is configured as a sensor for a mark on the carrier tape 10 or on the lancet body 2 with lancet tips 3 . fig7 a shows a circular arrangement of lancet tips 3 and lancet carriers 23 in the form of a lancet wheel 24 . in this case the lancet tips 3 can be bent towards the lancet carrier 23 and also have different lengths . the lancet carriers 23 can be separated from one another by grooves so that each lancet arm 25 can be deflected out of the plane of the circular lancet 1 . this can be used to execute the lancing process . in this process the lancet arm 25 in turn executes a circular movement during the lancing . the lancet arm 25 can have bars 26 which limit the lancing depth because during lancing they prevent further penetration of the lancet into the body . due to an appropriate pre - bending of the lancet arms 25 , the lancet returns automatically into its original position after the lancing as shown in fig9 . due to its flexibility , the lancet arm 25 can be deflected upwards as well as downwards . since the lancet arm 25 executes a circular movement during the lancing movement , the body of the user is not punctured perpendicularly but rather in a circular movement . as a consequence force is not only exerted vertically on the skin but rather lateral forces also act . as a result , the pain during lancing is greater than with a conventional lancet which is inserted perpendicularly into the skin . in order to reduce these lateral forces during the lancing process , the lancet tip 3 of the lancet 1 can have a blade 70 which slits the skin of the body and does not puncture the skin as is the case with conventional lancets . fig7 b shows a lancet 1 which has a blade 70 at its distal end 3 b . in contrast to a lancet tip 3 ( as shown in the previous figures ), the blade 70 does not have edges which converge uniformly and merge into the tip 3 . in the case of the blade 70 the edges 71 and 72 of the blade 70 converge towards the tip 73 at different angles . depending on the arrangement of the blade 70 to the lancet body 25 , the first side edge 71 and the second side edge 72 can run in the plane of the orbit or at right angles thereto . if the side edges 71 and 72 are arranged in the plane of the orbit , the ground side edges 71 and 72 can cut in the direction of movement whereas the side edges 71 and 72 disposed at right angles to the orbit can also cut transversely to the direction of movement which can lead to more pain during lancing . a wheel configured similarly to the lancet wheel 24 can also be designed for test elements which can be arranged together with the lancet wheel 24 in a system in such a manner that the lancing and blood transfer can be carried out at one opening . a device is shown schematically in fig8 a - d which shows the bending before the puncture and the bending back after the puncture . this device is preferably used with lancets which are attached to a carrier tape 10 . it can , however , also be used for lancets which are not attached to a carrier tape 10 . for the lancing process , the lancet 1 should be bent out of the carrier tape plane . this state is shown in fig8 a . for this purpose the carrier tape 10 is clamped between the bottom part 82 and the upper part 81 of the holding element 80 and the pusher 89 . as a result , a part of the carrier tape 10 is bent over which prevents it from slipping during the bending process . subsequently , the lancet 1 is bent at a predefined position with the aid of a tilting element 84 which is driven by a pusher 85 . in this process , the tilting element 84 exerts so much pressure on the lancet that it bends at the site at which it touches the upper part 81 of the holding element 80 as shown in fig8 b . as shown in fig8 c , the holding element 80 releases its hold on the carrier tape 10 after the bending process and the holding element 80 can be rotated out of the plane of the carrier tape in order not to hinder the lancing process . the lancet 1 can be moved for the lancing by moving the pusher . in order to be able to influence the lancing depth during the lancing process , the holding element 80 is connected to a carriage 88 which can displace the holding element 80 which in this case serves as a reference element for adjusting the lancing depth . as a result of the displacement of the holding element 80 , the upper part 81 of the holding element 80 is shifted to a greater or lesser extent over the carrier tape 10 towards the lancet tip . as a result of this shift , the lancet tip has a different length after the bending process depending on the extent to which the holding element 80 has been shifted forwards or backwards . the shifting of the carriage 88 can preferably be executed by a displacement thread 87 . in addition , a bending - back element 86 can be attached to the holding element 80 which bends the lancet 1 back again into the carrier tape plane after the lancet 1 has been inserted into the body . fig9 shows a lancet arm 25 which has a curvature 93 which projects slightly out of the plane of the lancet arm 25 . the channel of the microsampler can be located in this curvature . this allows a test element to be moved in a simple manner to the curvature in order to transfer the blood which has collected in the channel of the microsampler . while exemplary embodiments incorporating the principles of the present invention have been disclosed hereinabove , the present invention is not limited to the disclosed embodiments . instead , this application is intended to cover any variations , uses , or adaptations of the invention using its general principles . further , this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims .
the invention concerns a device for collecting body fluids which has at least one lancet comprising a lancet body with at least two tips of different lengths . the device is characterized in that it has a selection means with the aid of which only one tip is selected before the lancing . this selection means can have different functions and shapes . the selection means is used to select a tip from a plurality of lancet tips which have different lengths and make only this tip available for use in the lancing process . since the various tips are attached to a lancet body , it is , for example , possible to use a bending element which bends one of the various tips out of the plane of the lancet body in order to provide only one lancet tip for use . this is especially preferable for lancet tips that are arranged linearly relative to one another .