DE2803345B1 - Blood sampling device - Google Patents

Description

Furthermore, so-called. Blood lancets are known, which usually consist of a flat steel blade with lancet body and attached lancet tip exist, separately aseptically packed and intended for single use. The use of these blood lancets is relatively cumbersome because each Blood lancets must be removed individually by hand from their packaging and because the lesion must be set by hand for blood to emerge. Result from it as disadvantages of these known blood lancets, that considerable experience is necessary is to bring about an even flow of blood and that that work with these blood lancets is cumbersome and exhausting. This is especially true for Serial examinations, which also result from the use of these well-known blood lancets make it very time consuming.

The invention is based on the object of a blood sampling device of the genus described at the beginning, with the one under hygienically flawless Conditions can be worked on in a simple manner and without any special experience leads to even results and that, moreover, is easy and quick to use leaves. At the same time, the invention is based on the object for use in a Specify blood sampling device according to the invention particularly suitable needles. Furthermore, the invention strives for one which is particularly suitable for practical use Packaging form of such needles.

The object on which the invention is based in terms of apparatus is solved with a blood sampling device of the type described above, which is characterized by the use of blood lancets known per se as Needle, the blood lancets individually housed in pouches in a strip pack are and by means of a transport device acting on the strip package introduced into the blood sampling device and removed again after use and wherein the plunger acts on the blood lancets received in the pockets. - According to the invention, each blood lancet is used only once and then through replaced a new blood lancet. This is done by taking the blood lancets in the pouches of the strip pack allows both insertion and removal the blood lancets by means of the strip pack. During the whole process the blood lancets remain more or less completely in the pockets of the strip pack recorded, in particular, the plunger also acts on the blood lancets during this are in the pockets. The problem is that the blood lancets taken up in the pockets, but at the same time guided under the action of force should, his solution in that the bags surprisingly not only the ensure necessary isolation of the blood lancets, but at the same time as Serve guidance in the direction of impact defined by the direction of the force. In mechanical terms, the pockets only have to separate and guide the Ensure blood lancets; it is advisable, however, in the interests of the necessary Asepsis to see to it that the blood lancets in the pockets are covered on all sides, so these are completely closed.

The above explained in its basic structure according to the invention Blood sampling device allows a large number of different advantageous configurations. If, as explained, the pockets are closed on all sides, then - in particular if the strip pack is made of relatively flexible material - the assembly be taken so that the plunger through the material of the strip pack acts on the blood lancet held in the pockets. However, it is not there possible to withdraw the blood lancets into the pockets after use, rather the tips of used blood lancets protrude from the side of the strip pack. Furthermore, interference from the interposed Material of the strip packing result if this is designed to be relatively stiff is. If these conditions interfere, the invention therefore recommends an opening member provide that coupled to the plunger and for at least partial perforation the strip pack is set up. Due to the coupling, the opening member operated together with the plunger in such a way that a pocket is partially, d. H. is opened at least on one chamber wall. This first becomes the possibility a retrieval of a used blood lancet created, which is still below will be explained in detail. In addition, it can also be achieved that the plunger is immediately and attacks the blood lancet without the interposition of the strip pack. In particular it is possible to set up the plunger to perforate the strip pack yourself.

To the escape of the blood lancets from the pockets under the action of force To facilitate, a cutting device can be provided through which before the action of force, the tip-side edge area of the strip pack is severed will. But there is also the simpler option, the blood lancets themselves to perforate the strip packing under the action of force. This is simplified if the tip-side edge area of the strip pack has been specially provided The folding member is folded over approximately at right angles to the plane of the strip pack.

The folding member can, for example, be designed as a rail, roller or the like be. This folding of the edge area of the strip pack is at the same time the Possibility created to reduce the distance to the patient's body surface, so that with short distances as well as short and correspondingly inexpensive blood lancets can be worked.

For a controlled and reproducible discharge of blood is one to strive for a defined depth of penetration of the blood lancet into the body surface. That can be achieved by limiting the travel of the ram. Instead or also In addition, the invention recommends that the blood lancets have at least one opposite have their tip recessed shoulder and that the movement of the blood lancet can be blocked under the action of force by a stop assigned to the shoulder is. This can be done in different ways. So can the attack be provided either on the actuating device itself or on its housing. The stop can also be attached to a carrier member of the transport device, which will still be explained, for example a transport drum or on the strip pack itself, in particular if this is made rigid in a manner to be explained, can be arranged. If the blood lancets are not withdrawn after use, a stop occurs only provided on the rear side of the tip in the direction of transport, in order to achieve a To avoid transport obstructions due to the protruding blood lancets. In the other Case can shoulder or stop as desired, in particular on both sides of the tip to be ordered.

To avoid the annoyance of the patient by taking blood samples To keep low, a configuration is recommended such that regardless of the Handling of the whole device in any case the blood lancet in connection with the lesion of the patient is withdrawn. This can be done in a particularly simple manner can be achieved that the stop explained above a resilient support for the blood lancet is connected upstream. Under the force kung the resilient support is compressed, so that the end position of the blood lancet through the stop and the intermediate support is clearly defined. To as the force subsides, the resilient support expands again, see above that the blood lancet is immediately withdrawn from the surface of the body will. Afterwards, if necessary, the entire device can be used without disturbing the patient be dropped off; be discontinued; be deducted; be dismissed.

The depth of penetration can be adjusted by adjusting the stop take place. In order to ensure defined working conditions for the actuating device, The invention recommends, however, a body application that is at least 3 points, preferably on a surface surrounding the lancet tip, which can be supported at the removal area is and is to be provided and this, which is recommended in any case, in the direction of movement set up adjustable blood lancets.

A Version in which the plunger can be tensioned by means of a tensioning lever The spring is applied and can be triggered by a release lever, with the tensioning lever the transport device is coupled in such a way that when the spring is tensioned, the strip pack is transported by one pocket.

Instead of this purely mechanical one set up for manual operation Embodiment, on the other hand, there is the possibility of pneumatic actuation and thus a largely automatic operation with optimal convenience to reach. The compressed gas source required for this can be in the form of a conventional one Provide a pressurized gas cartridge in the device without further ado. It can be known in itself Way to make the arrangement readily so that both the force acting on the blood lancets as well as the transport of the strip pack through the inventive Blood sampling device is carried out pneumatically.

In addition, it is advisable to set up the sequence of movements so that that if a withdrawal of the blood lancets into the pockets of the strip pack is provided if this is done immediately after the use of the blood lancet in question, so that there is no risk of injury to the lancet tips protruding from the strip pack is excluded. Simultaneously with the retrieval of the used blood lancet or immediately afterwards, the strip pack can be transported further by one pocket and brought the actuating device into the release position for the next use will. This can be done with mechanical, pneumatic or otherwise to realize suitable means without further ado.

For the transport of the strip pack through the inventive Blood sampling device through there are numerous possibilities. So can in a simplest embodiment a continuous transport by means of a friction wheel or the like. are provided.

However, it is more advantageous to provide a driver member with Transport projections encompassing associated transport recesses of the strip pack.

The transport can either be carried out directly by the driver link be effected, the arrangement can also be made so that the driver member taken by the strip pack transported in any suitable manner is actuated and a releasable transport lock. Basically, the transport movement take place both linearly and in the form of a rotary movement. So can the driver link from a drum of round or polygonal cross-section with (preferably radial) Drive pins exist, with the strip pack associated with the drive pins Has breakthroughs. The openings can be central, one-sided or be arranged in pairs opposite one another on the edge of the strip pack. At this Embodiment, the drum is indexed in a unidirectional revolving way. To save space the driver element can be designed as a drum sector that can be switched forwards and backwards are formed, the transport projections in a manner known per se so - z. B.

designed in a sawtooth shape and / or when downshifting against spring loading retractable - are that the drum sector when switching back against the strip pack Free running Another possibility is to use a gear as the driver link to provide the teeth in the spaces between shawl-shaped recessed pockets the strip pack. Another option that stands out through special Space-saving design and is otherwise for kinematic reasons especially in connection with a strip pack designed as a rigid magazine recommends, is characterized in that the driver member consists of a gripper hook exists, which is linearly displaceable parallel to the transport direction and vertically can be moved forward and backward to the transport direction with respect to the strip pack. In addition, a linear transport movement of a rigid magazine can be very much can also be achieved inexpensively with a spring that is inserted during or after the onset of the Magazine is tensioned and this transported through the device while an indexing device for this which cooperates with the transport recesses ensures that one pocket is transported on at a time.

As mentioned, the opening of the pockets by means of a The opening member allows the blood lancets to be put in their pockets after use to withdraw. For this purpose, it is provided that the opening member is designed as a return pawl and the blood lancets with a rear handle that can be grasped or

to provide releasable latch abutment. Consist in detail different possibilities: the return pawl can either be designed as a hook be and enclose in a recess of the blood lancet or in the form of a fork grasp a protrusion of the blood lancets. In any case, care must be taken that the return pawl out of engagement with the pawl abutment after the return process is released so that the strip pack can be transported further.

For this purpose, the return pawl can be designed as an independent component and be hinged on the ram. However, the plunger itself is preferably used as a return pawl designed and articulated to an actuating part in order to

to be able to be brought out of engagement with the pawl abutment. In any case, this engagement movement of the return pawl is particularly simple Way controlled by having the return pawl with an opposite direction the force acting on the blood lancet inclined contact surface together. The contact surface on which the return pawl is preferably spring loaded is present, represents a control curve for the return pawl and can be used with any have suitable, straight or curved control profile.

The contact surface is flexible when using a Strip pack preferably fixed to the device on the actuating device, it can be used in the The strip pack is designed as a rigid magazine, and each pocket has its own Assigned run-on surface and arranged on the magazine.

The transport of the strip pack through the device is designed particularly easy and trouble-free when one in the direction of transport and vertically to the direction of the force running guide track is provided in the the strip pack is guided at least, but preferably only at the edge. With regard to the provision and guidance of the strip pack in the device, the invention provides different possibilities, which differ mainly depending on whether a flexible or rigid strip packing is provided. A flexible strip pack is preferably in a dispensing cassette of substantially circular cross-section housed, the guide track being substantially tangential to the dispensing cassette joins. The strip pack lies as a - preferably coreless - roll in the dispensing cassette and is guided past the work position by the guideway, in which the blood lancets are activated.

The dispensing cassette can be connected to the blood sampling device according to the invention fixed and for inserting the strip pack with a removable lid be provided. Another, particularly advantageous option is characterized by that the dispensing cassette and the actuating device interlocking formations associated with one another have and that the dispensing cassette by means of the form-fitting formations releasably with the actuating device can be connected, the guideway at least partially in an outlet channel connected to the dispensing cassette, preferably in one piece runs.

Based on this, there is the preferred option of using the dispensing cassettes in the form of one-way or one-way packaging. The form-fitting training with which the dispensing cassette is snapped into place on the actuating device, are more advantageous Way attached to the exhaust duct. The locking can basically be done to a large extent take place in any direction, but advantageously the arrangement is made in such a way that that the interlocking formations joined together in the direction of transport for snapping into one another will.

Without any special measures, the strip pack runs with the used ones Blood lancets on the device side opposite the dispensing cassette from the Actuating device from where they are - preferably at the perforations provided for this purpose - can be demolished. This can be dispensed with in that a recording cassette intended for the leaking strip pack with the used blood lancets is, which can be constructed in principle similar to the dispensing cassette. It recommends in the process of connecting the dispensing and receiving cassette through the outlet channel, wherein the guideway runs completely in the outlet channel. Of course he knows Outlet channel, an engagement opening for the transport device and a passage for the blood lancets.

In the context of the invention, the strip pack can also be used as a rigid one Magazine to be trained. A guide chamber is preferred for this case provided in which the magazine can be indexed step by step.

The passage for the blood lancets usually opens.

in the guide chamber, if it is not designed to be closed, see above the passage meets at least the (imaginary) extension of the guide chamber. If the magazine is cuboid, it is recommended that the guide chamber than running perpendicular to the direction of the force applied to the blood lancets Design guide shaft in which the magazine is indexed linearly. It is also possible to bend the strip pack into a circle, as it were, with which a circular disc or. drum-shaped magazine results. In this case becomes a circular cylindrical guide chamber, possibly with a concentric one Mounting pin provided. The direction of the force applied to the blood lancets can be radial as well as axially parallel with respect to the cylindrical guide chamber take place. The indexing of the rigid magazine can in any case with the means take place, which was explained above in connection with the transport device have been.

The invention also relates to a blood lancet that is used for Use in the described blood sampling device is particularly suitable. In their basic structure, blood lancets consist of a lancet body and lancet tip, wherein in the known embodiment the lancet body is level with a longitudinal one Executed stiffening thickness and the lancet tip opposite the lancet body is very short. This known embodiment is basically suitable, preferably however, the lancet body is U-shaped in cross-section with a U-bar and from this formed angled U-legs, the lancet tip connected to the U-bar is. The U-legs allow the blood lancet to be guided precisely when the force is applied and also cause stiffening.

Basically and especially with this U-shaped design it is advisable to keep the lancet tip much longer than previously usual, namely to be carried out with a length that is 1/3 to 1/2 of the total length of the blood lancet. This is an optimal compromise between the leadership properties under the Effect of force on the one hand and minimal material expenditure on the other hand achieved. In addition, the lancet tip is advantageously on at least one side of the The lancet body is set off by a shoulder that works in conjunction with a fixed device Stop ensures uniform penetration depth.

With regard to the retrieval of the blood lancets after use, see the invention proposes that the lancet body has a form-fitting design for formation has a plunger and pawl abutment.

It can be a recess, for example, preferably be an elongated hole, in the U-bar or around a notch that is open on the side or at the top.

On the other hand, the plunger and pawl abutment can through a projection be formed, for example by a U-web - preferably in the U-gap in - bent nose or through a U-gap on the back, End wall starting from the U-bridge. In any case, the plunger or return pawl work when the force is exerted on the blood lancet or when it is withdrawn the ram and pawl abutment together.

The invention also relates to a strip package for the Blood lancet suitable for use in a blood sampling device according to the invention is specially furnished. Strip pack means im Frame of In general invention a structure with a defined longitudinal direction, in which in the longitudinal direction side by side pockets for receiving the blood lancets are arranged. A pack of strips can be both flexible and rigid and it is within the scope of the invention possible to close the longitudinal direction as it were to a circle.

A strip pack according to the invention is first and foremost characterized by evenly spaced apart elongated Pockets for holding one blood lancet each, the lengthways extension of the pockets perpendicular to the longitudinal direction of the strip and through transport recesses that have the same distance from each other as the distance between adjacent pockets. The transport recesses can consist of openings arranged in the middle or on the edge, the rest opposite the pockets can be arranged as desired, provided that the interior of the Bags not being opened.

The breakthroughs can also be open at the edge so that they are in particularly simple way when inserting the strip pack parallel to the direction the force and thus in the direction of the longitudinal expansion of the blood lancets are brought into engagement with the transport projections of the transport device can.

A first embodiment that is particularly suitable for flexible strip packs recommends, is characterized by the structure of a base film and a cover film Made of paper, plastic film or the like, with the base and cover films placed one on top of the other and in a ladder-shaped area with the formation of the blood lancets on all sides enclosing bags be connected to each other. Sufficiently flexible by choice Materials can be achieved in this way that the bags are folded when the Form foils by themselves without any special measures. On the special shape the pockets can be dispensed with in particular if they are essentially flat trained blood lancets are used. Especially with this flat version It is recommended that the strip pack be at least parallel to that of the lancet tips to pre-form a continuous bending point facing the edge of the strip package, which makes it easier to fold over the edge area of the strip pack on the tip side will. This bending point preferably runs directly in front of the tip-side Limitation of pockets.

The connection between the base and cover film can - in particular if these are made of paper -by doing that at least parallel to the edges extending in the longitudinal direction of the strips are each provided with an embossing, which runs zigzag in section and the appearance of a ripple offers. This leads to a sufficiently strong and tight bond, at the same time, such an imprint behaves like a continuous bending point in the explained meaning. On the other hand, such a bending point can also be used as a perforation or as an embossed reduction in the thickness of the base and cover sheets. These last-mentioned options are particularly recommended for another advantageous one Embodiment of the strip pack, wherein the base and cover film made of thermoplastic Plastic film or made of such a laminated material and are welded together.

The invention also provides between adjacent pockets one Provide tear-off perforation so that the strip pack leaking out of the device can be easily torn off with used blood lancets.

In a preferred embodiment, at least one of the Foil pre-embossed depressions to form the pockets. That is recommended especially if the blood lancets are U-shaped and therefore a larger one Require pocket volume. The strip pack can be used as a so-called sealing strip with a base and cover film can be made of essentially the same streakiness. It exists furthermore the possibility of using the base film in which the indentations are embossed, with opposite the cover foil (which for example consist of a thin metal foil can), to have a much higher rigidity and thus to a so-called blister strip to get.

An embodiment that is preferably designed as a blister strip and is easy to manufacture with particularly reliable and trouble-free Use distinguishes, is characterized in that the depression has an acute angle have a triangular cross-section and that the lancet tips to the tip angle Clues. The contour of the blood lancets resembles the acute-angled triangular ones Cross-section of the pockets adapted, so that in the preferred embodiment with U-shaped lancet body the boundaries of the U-legs correspondingly in the direction converge to the lancet tip.

For the engagement of the plunger or the return pawl, it is advantageous to if the lancet tip runs parallel to the cover sheet and the U-legs of the Face foil.

Another embodiment that admittedly only includes a finite Number of blood lancets permitted, but is particularly easy to use is characterized by the fact that a strip pack, preferably in the above explained flexible embodiment, as it were closed in their plane to form a circle with the pockets being arranged radially.

This embodiment forms the transition to the through the invention further provided embodiment of the strip pack as a rigid magazine.

The pockets consist of receiving channels penetrating a base body, on both end faces by a cover film, which is preferably a self-adhesive Metal foil is sealed.

The magazine can be parallelepiped and arranged next to one another in one plane Be formed receiving channels, with the corresponding linearly switched will. The magazine can also, as it were, about a direction parallel to the direction of the action of force Axis to be wound into a drum magazine, which can be rotated in a circular cylindrical Guide chamber is stored. In any case, it is recommended to use the rigid magazine Provide transport receptacles open at the edge, into which a gripper hook of the Transport device engages. On the other hand, the transport recesses can also as a relatively extended partially cylindrical running over the width of the magazine Depressions are carried out, which also leads to material and weight savings leads. In this version as a rigid magazine, there is still the advantageous one Possibility of at least one stop for one provided on the blood lancets Provide shoulder directly on the receiving channels, namely on the lancet tips assigned page.

Further on the back, i. H. at which the lancet tip Zen opposite side each inclined with respect to the direction of the force Contact surface are provided, which the movement of the plunger or

Return pawl to engage the plunger or clinker abutment of the blood lancets controls.

To improve the guidance of the blood lancet under the action of force it can also be provided that the pockets have guide slots that extend extend in the direction of the force and in which the blood lancets slide are stored. This possibility exists in principle with every embodiment, However, this is particularly recommended if, for example, to save space in the case of a rigid magazine - can be used in essentially flat blood lancets. The guide slots can be easily attached to the continuous receiving channels provide and ensure precise guidance.

There is also the advantageous possibility of using the guide slots To attach locking projections, between which the blood lancets resiliently held are. The locking projections are arranged and hold in front of and behind the blood lancets these thus in turn, preferably in the interior of the pockets, of the receiving channels of a rigid magazine, solid. This is done resiliently, i. H. that not usual transport vibrations or the like, but the forces exerted by the plunger or return pawl are sufficient, to overcome the resistance of the locking projections.

The invention is described below on the basis of exemplary embodiments only Illustrative drawing explained in more detail. It shows F i g. 1 in a schematic representation a blood sampling device, partially broken open, FIG. 2 a section a strip pack with a blood lancet, in longitudinal section, FIG. 3 the subject the F i g. 2 in cross section, F i g. 4 a pack of strips in top view, in different Phases of use, Fig. 5 shows the subject matter of Fig. 1, excerpts in section V-V (Fig. 1), Fig. 6 the subject of FIG. 5 in section VI-VI (Fig. 5), Fig. 7 a strip pack with different embodiments of blood lancets, Fig 8 shows another embodiment of a strip pack in cross section, FIG. 9 den The subject of F i g. 8 in plan view, partially broken away, FIG. 10 the subject the F i g. 8 in longitudinal section, FIG. 11 shows another embodiment of the object the F i g. 8 in connection with an actuating device, FIG. 12 a strip pack in the form of a rigid magazine in connection with parts of the actuation device, 13 shows the object of FIG. 12 in section XIII-XIII (FIG. G.12), FIG. 14 a another embodiment of the subject matter of FIG. 12 in cross section.

The blood sampling device according to the invention, which is initially based on the schematic representation of FIG. 1 will be explained in its main features is used to peripheral the body surface of a patient by means of a needle to injure so that a drop of blood needed for blood tests emerges. So-called blood lancets 1 are used as needles, which are packaged in strips 2 provided and in a manner to be explained under the action of force against the Body surface moved, d. H. accelerated relatively energetically in practice will. The F i g. 1 shows a view against the direction of the force and initially reveals a housing 3 and a handle 4. Perpendicular to the direction the action of force runs through the housing 3, a channel 5 with a guide track 6 in which the strip pack 2 is guided at its edge. The strip pack 2 is transported through the device by means of a transport device that in the illustrated embodiment, essentially one with driver pins 7 provided drum 8 has a round cross-section, unidirectional in the direction of the Arrow 9 is incremented. The strip pack 2 with the blood lancets 1 is removed from a dispensing cassette 10, which is used as a disposable pack, by means of an outlet channel 11 or

Form-fitting formations 12 provided on the housing to the housing 3 is attached and released by actuating a push button 13 from the form fit can be. The guide track 6 continues through the outlet channel 11 and opens essentially tangentially into the circular cylindrical interior of the dispensing cassette 10. As a result, the strip package 2 runs in the form of a coreless roll is arranged in the dispensing cassette 10, a trouble-free in the guide track 6, being above the guide track 6 in which the strip pack 2 is guided at the edge is, there is a free space 14 through which the following will be explained in more detail Bags 15 can pass. The dispensing cassette 10 becomes the strip pack 2 by means of the drum 8 at a working position 16 at which blood samples are taken, conveyed over to an outlet opening 17.

Fig. 2 shows a detail of the strip package 2 in longitudinal section, in which the blood lancet 1 can be seen in cross section, as it is with its own Longitudinal direction, which corresponds to the direction in which the force is applied, perpendicular to the longitudinal extent the strip pack 2 is arranged, which is readily apparent from FIG. 3, which represents a cross section perpendicular to the longitudinal direction of the strip pack 2.

The basic structure of the strip pack 2 consists of a base film 18 and a cover film 19, both of which are made of a thermoplastic Plastic film are made and welded together, in a ladder-shaped Area 20, which is parallel to one another in the longitudinal direction of the strip pack 2 and encloses pockets 15 arranged perpendicular to the longitudinal direction of the strip pack 2, what is particularly based on the F i g. 4 can be seen. The F i g. 4 shows at the same time, that the strip pack has 2 transport recesses in the form of openings 21, which are arranged in the middle of the strip between the pockets 15 and one from the other Have a distance that corresponds to the distance between adjacent pockets 15. In each Pocket 15 contains a blood lancet 1, which consists of a lancet tip 22 and a lancet body 23, the lancet body 23 in the illustrated Embodiment in cross section U-shaped with that merging into the lancet tip 22 U-web and from this angled U-leg 25 is constructed. The F i g. 4 leaves recognize that the lancet tip 22 on both sides by a shoulder 26 from The lancet body is separated and, moreover, has a length that is only a little is less than the length of the lancet body 23 and thus only slightly less than half the Total length of the blood lancet 1.

The F i g. 4 shows the strip pack 2 in different phases of use, The direction of transport is to be imagined from top to bottom. The strip pack 2 is shown in dashed lines in the Fig. 3 just extended configuration fed (a). First, by means of a (not shown in the figures) Folding link both the tip-side and the rear edge area in that shown in solid lines in FIG. 3, approximately at right angles to the plane of the strip pack 2 angled position folded down (b).

In the subsequent work position, there will be more detailed explanations Way the force acting on the blood lancet 1 with the result that this is a Lift U under the perforation of the cover film 19 out of the pocket 15 against the (not body surface shown is moved (c). Eventually the blood lancet will 1 is withdrawn again into the pocket 16 in a manner which is also still to be explained (d), followed by a further transport step, the next blood lancet 1 brings it into working position.

The F i g. 5 and 6 show in detail one embodiment, for example an actuating device with which the blood lancets 1 are pushed back and forth will. In Fig. 5 you can initially see the housing 3, the channel running in it 5, the transport drum 8 arranged below and the guide tracks 6, which are shown in FIG this area corresponding to the explained folding of the edge areas of the strip pack 2 run vertically. The force acting on the blood lancet 1 takes place here through a plunger 27 which, when a trigger (not shown) is actuated, under the effect of a (also not shown) in the previous transport step tensioned spring against the blood lancet 1 is accelerated and without opening the pocket 15 through the material cover film 19 through to the rear end the blood lancet 1 acts. The blood lancet 1 is accelerated as a result first perforates the corresponding area of the with its lancet tip 22 Cover film 19 passes through a passage 28 provided for this purpose in housing 3 and finally penetrates the body surface intended for taking blood samples 29 a. The stroke H of the blood lancet 1, which corresponds to the path of the plunger 27, is limited by the fact that at the end of the stroke the blood lancet 2 with the shoulder 26 on one Stop surface 30, which surrounds the passage 28, rests. To ensure a reproducible The depth of penetration of the lancet tip 22 into the body surface 29 is a body abutment 31 is provided on a surface surrounding the passage 28 on the body surface 29 supported in the extraction area and also for setting the penetration depth by means of a thread 32 can be adjusted in the direction of movement of the blood lancet. That The blood lancet 1 is withdrawn by means of a return pawl 33 on the plunger 27 is articulated and the cover sheet 19 is perforated as an opening member. That will make it achieved that the return pawl 33 during the stroke of the plunger 27 against a stop surface 34 starts, which is inclined with respect to the direction of movement of the blood lancet 1 and thus pushing the return pawl 33 through the cover film 19. The Return pawl 33 - before the attack of the plunger 27 - in a pawl abutment a, which consists of an elongated hole 35 provided in the U-shaped web of the lancet body 23. Only when this is the case does the plunger 27 strike the rear end of the blood lancet 1, so that now this, plunger 27 and return pawl 33 move forward synchronously. If the plunger 27 is then withdrawn, the one encircling the elongated hole 35 takes Return pawl 33 with the blood lancet 1 until it is in the starting position in the pocket 15 has reached again and the return pawl 33 through the contact surface 34 again is released. The individual phases of movement are shown in FIG. 5 shown.

The F i g. 6 shows a section through the subject of FIG. 5. The U-shaped blood lancets 1 and those on the contact surface can be seen in cross section 34 attached return pawl 33. FIG. 6 shows particularly clearly how the one in In the direction of the arrow 9, the drum 8, which is switched further, transports the strip pack through that the driver pins 7 engage in the openings 21 of the strip pack 2.

7 initially shows how the openings 21 also on both sides can be provided on the edge of the strip pack 2. Furthermore and above all shows 7 shows a plurality of different embodiments of the blood lancets 1. Man recognizes on the one hand different embodiments of the lancet tip 22 and on the other hand, like the latch abutment not only as an elongated hole 35, but also as an open side Notch 36 or upwardly open notch 37 can be carried out.

While it is in the embodiments described above the strip pack by so-called

Sealing strips acted, and have relatively low rigidity, show the F i g. 8-11 another embodiment. Here is the strip pack as so-called

Blister strip executed, which consists of a base film 18 proportionally high rigidity, in which pockets 15 are embossed, and a cover film 19, very low rigidity, preferably made of a thin metal foil, which Relationships are illustrated with the aid of FIG. 8, in which the starting position is drawn out the blood lancet 1 and dashed - after perforation of the base film 18 through the Lancet tip 22 - the extended position of the blood lancet 1 are shown. The F i g. 9 shows - with the cover film 19 partially removed - the arrangement of FIG Blood lancets in the pockets 15, which here are not actually themselves in the base film 18 are embossed, but rather as spaces between the truncated pyramids Embossings 38 arise over which the cover film 19 runs. Fig. 10 shows further that in this embodiment also the transport of the strip pack done in another way. The transport recesses are here through the spaces between the shell-shaped recessed pockets 15, ie through the truncated pyramidal ones Formings 38 formed, in which the teeth 39 of a gearwheel as driver members 40 intervene. Advancement and retrieval of the blood lancets 1 take place here like that in connection with the F i g. 5.6 explained.

The in F i g. 11 illustrated embodiment of the strip pack 2 is characterized in that the to form the pockets 15 in the base film 18 provided depressions have an acute-angled triangular cross-section, the lancet tips 22 pointing towards the acute angle 41. According to that triangular cross-section of the pocket 15 are also the U-legs 25 of the cross-section U-shaped lancet body 23 converging in the direction of the lancet tip 22 formed so that the contour of the blood lancet 1 as a whole to the cross section of the Pocket 15 is adapted, with only on the back of the Blood lancet 1 there is a free space 42 in the pocket 15, in which the plunger 27, which is here at the same time the return pawl 33 forms. The lancet tip 22 also runs along the largest side of the triangle, the one in the illustrated embodiment, as a right-angled one The triangle forms the hypotenuse, forming the cover sheet 19, while the U-legs 25 the base film 18 are facing. The U-web of the blood lancet 1 also has here a recess between you and the rear end of the blood lancet 1 includes a web 43, which acts as a ram and clinker abutment from the fork-shaped Plunger head 44 is grasped so that in the fore and aft direction a form-fitting There is an intervention. The plunger 27 is articulated on an actuating part 45 is When moving forward, first over the rear boundary of the strip pack 2 raised, then perforating the cover sheet 19 until it engages between Plunger head 44 and web 43 lowered and then taking the blood lancet with it 1 moved forward and back again, to finally after reaching the starting position to be raised and withdrawn again. Raising and lowering the ram head 44 can also by means of a (not shown) contact surface or can also be brought about by (also not shown) drive means. Incidentally, Fig. 11 shows how the top of the strip pack 2 due to the acute-angled, triangular pocket cross-section is inclined, and how accordingly the gear 40, which in turn is provided for transport, arranged with an inclined axis is.

In the above-described embodiments, there is the strip packing 2 - with more or less great flexibility - from two interconnected foils 18, 19. In contrast, FIGS. 12-14 show another embodiment in which the strip pack is designed as a rigid magazine 46 which essentially has the shape of a cuboid with a plurality of mutually parallel Enforce receiving channels 47. The receiving channels 47 are on their end faces each closed by a cover sheet 48, which in the exemplary embodiment consists of a self-adhesive There is metal foil and on both sides of the magazine continuously over the longitudinal narrow sides runs. The blood lancets 1 are flat here and in guide slots 49 out, which run in the direction of the force and perpendicular to the longitudinal extent of the magazine 46 are arranged.

In the case of the FIG. 14 are also illustrated embodiment Latching projections 50 are provided in the guide slots 49, which hold the blood lancet 1 normally hold tight and - with elastic deformation - only when force is applied allow a longitudinal displacement of the blood lancet 1. In addition, FIG. 13 on both sides of the magazine 46 transport recesses in the form of depressions 51 can be seen, which have an approximately semicircular cross-section and a width, which is only slightly less than the distance between adjacent depressions 51, i. H. accordingly between adjacent receiving channels 47. These depressions 51 are used for step-by-step indexing of the magazine 46 in a (not shown) Guide shaft and also cause a considerable reduction in weight.

As the F i g. 12 shows, the force is applied in this embodiment on the blood lancets 1 in turn by means of a plunger 27, which also acts as a return pawl is formed and with an inclined relative to the direction of the force Contact surface 34 cooperates, which is partly on the housing 3 and partly on the input side the receiving channels 47 is provided. With the aid of the movement phases shown in FIG it can be seen how the plunger head 44 runs against the contact surface 34, with its Tip 52 perforates the cover sheet 48 through the part lying in the receiving channel 47 the contact surface 34 is guided from below against the blood lancet 1. It summarizes the plunger head 44 into an elongated hole 35, through which to the rear end of the Blood lancet 1 towards a web 43 is formed, which is formed by a behind the plunger head 44 provided notch 53 is gripped. In this position, the plunger 27 is flush with the receiving channel 47 so that the blood lancet 1 can be advanced, until they are provided with the shoulders 26 on one (not shown) on the housing 3 Stop is present. The way back from the plunger 27 and blood lancet 1 takes place accordingly, until the blood lancet 1 has reached its starting position again, the plunger 27 released downwards and pulled out of the area of the receiving channel 47 so that the magazine 46 can be indexed.

Claims (40)

Claims: 1. Blood sampling device with a force applied against the body surface of a patient movable needle and with a to Force acting on the needle in the direction of the needle tip set up actuating device with plunger and trigger, g e k e n n n z e i h n e t d u r c h the use of Blood lancets (1) as a needle, the blood lancets (1) individually in pockets (15) a strip pack (2) are received and by means of one on the strip pack (2) attacking transport device (8), (40) introduced into the blood sampling device and can be removed again after use and the plunger (27) on the in the pockets (15) taken up blood lancets (1) acts. 2. Blood sampling device according to claim 1, characterized in that that the pockets (15) of the plunger (27), which are closed on all sides, are penetrated by the material (18, 19) acts through the strip pack (2) on the blood lancets (1). 3. Blood sampling device according to claim 1, characterized by an opening member (33) which is coupled to the plunger (27) and for at least partial Perforation of the strip pack (2) is set up. 4. blood sampling device according to any one of claims 1-3, characterized by a cutting device through which the tip-side Edge area of the strip pack (2) can be separated. 5. blood sampling device according to any one of claims 1-3, characterized characterized in that the blood lancets (1) under the action of force the strip pack (2) perforate. 6. blood sampling device according to any one of claims 1-5, characterized by a folding member in the form of a rail, roller or the like. The tip-side Edge area of the strip pack (2) through the folding member approximately at right angles can be folded over to the level of the strip pack (2). 7. blood sampling device according to any one of claims 1-6, characterized characterized in that the blood lancets (1) have at least one opposite their tip (22) have recessed shoulder (26) and that the movement of the blood lancets (1) under the force of a stop associated with the shoulder (26) (30) can be blocked. 8. blood sampling device according to any one of claims 1-7, characterized by a body abutment (31), which at at least three points, preferably on one the surface surrounding the lancet tip (22), can be supported on the body surface (29) and is adjustable in the direction of movement of the blood lancet (1). 9. blood sampling device according to any one of claims 1-8, characterized characterized in that the plunger is tensioned by a spring which can be tensioned by means of a tensioning lever acted upon and triggered by a release lever, with the Spannhebei the transport device is coupled in such a way that when the spring is tensioned, the strip pack is transported further by one bag. 10. blood sampling device according to any one of claims 1-9, characterized characterized in that the transport device has a driver member (8, 40), the one with transport projections (7, 39) in assigned transport recesses (21, 38) the strip pack (2). 11. Blood sampling device according to claim 10, characterized in that that the driver member consists of a drum (8) of round or polygonal cross-section with driving pins (7), and that the strip pack (2) the driving pins has associated openings (21). 12. Blood sampling device according to claim 10, characterized in that that the driver member consists of a forward and backward switchable drum sector. 13. Blood sampling device according to claim 10, characterized in that that the driver member consists of a gear (40), the teeth (39) of which in spaces (38) enclose between the cup-shaped recessed pockets (15) of the strip pack (2). 14. Blood sampling device according to claim 10, characterized in that that the driver member consists of a gripper hook that is parallel to the transport direction linearly displaceable and perpendicular to the transport direction in relation to the strip pack is forward and backward. 15. Blood sampling device according to one of claims 3-14, characterized characterized in that the opening member is designed as a return pawl (33) and the blood lancets (1) can be grasped or released from behind by the return pawl Have pawl abutments (35,36,37,43). 16. Blood sampling device according to one of claims 3-15, characterized characterized in that the return pawl (33) is articulated on the plunger (27). 17. Blood sampling device according to one of claims 3-15, characterized characterized in that the plunger (27) is designed as a return pawl and is attached to an actuating part (45) is hinged. 18. Blood sampling device according to one of claims 3-17, characterized characterized in that the return pawl (27, 33) with an opposite direction the force acting on the blood lancets (1) inclined contact surface (34) interacts. 19. Blood sampling device according to one of claims 1-18, characterized by one in the transport direction (9) and perpendicular to the direction of the force running guide track (6) in which the strip pack (2) is guided at the edge. 20. Blood sampling device according to one of claims 1-19, characterized through a dispensing cassette (10) of substantially circular cross-section, wherein the guide track (6) opens essentially tangentially into the dispensing cassette (10). 21. Blood sampling device according to claim 20, characterized in that that the dispensing cassette (10) and the actuating device, associated form-locking formations (12) and that the dispensing cassette (10) by means of the form-fitting formations (12) can be releasably connected to the actuating device, the guide track (6) at least partially in an outlet channel connected to the dispensing cassette (10) (11) runs. 22. Blood sampling device according to claim 20 or 21, characterized through a receiving cassette, the dispensing and receiving cassette through the outlet channel are connected and wherein the guide track runs completely in the outlet channel. 23. Blood sampling device according to one of claims 1-19. marked by a lead rungskammer, the strip packing as a rigid Magazine (46) is designed and can be indexed step-by-step in the guide package is. 24. Blood lancet for use with a blood sampling device according to one of claims 1-13, with lancet body and lancet tip, characterized characterized in that the lancet body (23) has a U-shaped cross-section with a U-web (24) and is formed from this angled U-legs (25), the lancet tip (22) is connected to the U-web (24). 25. The blood lancet according to claim 24, characterized in that the length of the lancet tip (22) approximately 1/3 to 1/2 of the total length of the blood lancet (1) is. 26. Blood lancet according to claim 24 or 25, characterized in that that the lancet body (23) has a form-fit formation (35, 36, 37, 43) for formation has a plunger and pawl abutment. 27. Strip pack, especially for a blood sampling device according to any one of claims 1-23 and in particular for receiving blood lancets one of claims 24-26, characterized by at an even distance next to each other arranged pockets (15) for receiving one blood lancet (1) each, the longitudinal extent the pockets (15) is perpendicular to the longitudinal direction of the strip, as well as through transport recesses (21, 38), which are at a distance equal to the distance between adjacent pockets (15) exhibit. 28. strip pack according to claim 27, characterized by a Structure of a base film (18) and a cover film (19) made of paper, plastic film Or the like., With base and cover sheet (18, 19) placed on top of one another and in a ladder-shaped Area (20) with the formation of pockets surrounding the blood lancets (1) on all sides (15) are interconnected. 29. strip pack according to claim 28, characterized in that Base and cover sheet (18, 19) at least parallel to theirs in the longitudinal direction of the strips extending edges are connected by an embossing. 30. strip pack according to claim 28, characterized in that Base and cover film (18, 19) made of thermoplastic plastic film or with a such laminated material exist and are welded together. 31. Strip pack according to one of claims 27 to 30, characterized by a tear-off perforation provided between adjacent pockets. 32. strip pack according to one of claims 27-31, characterized in that that at least one of the foils (18, 19) has pre-embossed depressions (15, 38) for formation the pockets (15). 33. strip pack according to one of claims 27 to 32, characterized in that that the base film (18) is more rigid than the cover film (19). 34. strip pack according to one of claims 27-33, characterized in that that the pockets (15) have an acute-angled triangular cross-section and that point the lancet tips (22) towards the acute angle (41). 35. strip pack according to one of claims 27-34, characterized in that that it is essentially flat and closed in a circle. 36. strip pack according to claim 27, characterized by a Structure as a rigid magazine (46), with the pockets (15) penetrating through a base body There are receiving channels (47), each of which has a cover sheet on both end faces (48) are closed. 37. strip pack according to claim 36, characterized in that the receiving channels (47) on the tip side at least one stop for one to the Blood lancets (1) have provided shoulder (26). 38. strip pack according to claim 36 or 37, characterized in that that the receiving channels (47) on the back opposite to the direction of the force have inclined contact surface (34). 39. Strip pack according to one of claims 36-38, characterized in that that the receiving channels (47) have guide slots (49) which extend in the direction the force and in which the blood lancets (1) are slidably mounted are. 40. strip pack according to claim 39, characterized in that locking projections (50) are provided in the guide slots (49), between which the blood lancets (1) are kept flexible. The invention relates to a blood sampling device with a below Force applied against the body surface of a patient's movable needle as well with one set up to exert force on the needle in the direction of the needle tip Actuating device with plunger and trigger. Such blood sampling devices are used extensively in medical practice to determine blood of blood sugar, blood count or similar to take examinations for which only small amounts of blood of the order of a drop are necessary. The blood sample is taken doing this through a targeted peripheral lesion of the patient with the needle. A at Withdrawal of the blood droplets emerging from the needle is recorded on a sample carrier and submitted for investigation. The force acting on the needle is thereby through Percussion or impact by means of a plunger, striker or the like. Exerted to this in the Actuating device is provided and can be triggered by the trigger. In (from practice) known devices of the above-mentioned The genus is the needle as an integral part of the device for repeating Use with changing patients. This is extremely unsatisfactory from a hygienic point of view.