HK1119929B - Lancet system with a sterile protection - Google Patents

Description

Lancet system with sterile protection

Technical Field

The invention relates to a lancet system comprising at least one lancet with a lancet tip embedded in a sterile protective element. The invention relates in particular to a lancet system for at least two lancets for use as a magazine. The invention further relates to a lancing device having at least one lancet system according to the invention.

Background

The extraction of body fluids, in particular blood, is first of all carried out with the purpose of subsequent analysis in order to be able to diagnose a disease or monitor the metabolic state of the patient. One such blood extraction task is performed, particularly in diabetic patients, for determining blood glucose concentration. In order to extract very small amounts of blood for diagnostic purposes, sterile, sharp lancets are often used, which are inserted into the patient's finger pad or into other body parts, for example, by medical staff or the patient himself. In the context of so-called "home monitoring", the medical layman also carries out simple blood analyses, in which first of all a lancet system and a suitable device (so-called blood collection device, lancet device or, as described below, puncture-assisting device) are provided, which makes it possible to collect blood with as little pain as possible and with reproducibility.

The lancet tip of a lancet for extracting blood is typically sterilized beforehand and is kept sterile before it is used in a puncturing procedure by a sterile protective element (e.g. in the form of a housing or a pouch) in order to ensure that the lancet tip is not contaminated by the environment. Furthermore, precautions are often taken for shielding the lancet tip again after completion of a puncturing procedure (if necessary with the same housing or pouch), in order to avoid accidental injuries and thus to avoid subsequent infections due to blood adhering to the lancet tip.

A sterile protective element can be produced, for example, on a single lancet by pressing the tip of the lancet with plastic in a single operation as the lancet body is produced. The user mostly removes this component by hand when loading the lancing aid before use. In the use of boxed lancets, similar sterile guards are common, for example, a sterile guard on which the lancet is pulled back out of the sterile guard and which is subsequently conveyed out of the puncturing path by means of a spring force. For this purpose, expensive means, in particular springs, are required, which are integrated in the consumable.

The trouble of such a mechanism is circumvented in WO 01/66010 by simply piercing the sterile protection. WO 01/66010 relates to a lancet device comprising a lancet needle part with a piercing tip and a lancet body which completely surrounds the lancet needle part at least in the region of the piercing tip. The lancet body is made of an elastic material at least in the area of the piercing tip of the lancet needle section, into which the piercing tip of the lancet needle section is embedded. Furthermore, a lancet device is specified, which comprises a lancet needle part with a piercing tip and a hollow body surrounding at least the piercing tip of the lancet needle part. The lancet is movable in the hollow body in the region of its piercing point and the hollow body is at least partially made of an elastic material which can be penetrated by the piercing point of the lancet needle part during the puncturing process and can be closed again after the piercing point of the lancet needle part has returned into the hollow body. The disadvantage is that the elastic sealing structure causes friction over the entire penetration path. The drive mechanism of the puncture aid used must therefore be dimensioned accordingly. However, such a sealing structure of the lancet tip used is in many cases not required for a cartridge or individually present lancet, since the lancet tip is, for example, returned into the rigid hollow body and thus does not pose the risk of environmental infection and the risk of injury.

US 5,304,192a relates to a lancet device having a lancet needle portion with a piercing tip surrounded by a removable cover. The enclosure ensures sterility of the lancet tip until use. The housing is connected to a component of the lancet device by a frangible connection and manually unscrewed to remove the component.

US 5,554,166 relates to a lancet device having a lancet needle portion, the lancet being provided with a sterile protective cover in an unused state. To remove the sterile protective cap, it is rotated in such a way that it breaks at a predetermined break.

Manually unscrewing the cover to release the lancet tip for the puncturing process is a step that should be avoided in processes for extracting body fluid, since this step makes the use of such lancets cumbersome.

Disclosure of Invention

The object of the invention is to eliminate the disadvantages of the prior art. The object of the invention is, in particular, to provide a lancet system or lancet magazine, in which at least the lancet tip remains sterile until the first use in the unused state and the lancet is stored after this use in such a way that environmental infections and accidental injuries to the user are avoided. Furthermore, the object of the invention is to ensure that the lancet needle parts, in particular the lancet tips, are subjected to as little friction as possible during the puncturing process and when the lancet tips are returned after the puncturing process, with the sterile protection, so that a less powerful drive mechanism can be selected for the puncturing aid used than in the prior art, wear on all moving parts of the puncturing aid is reduced, and the service life of the puncturing aid is extended.

According to the invention, this object is achieved by a lancet system comprising at least one lancet with a lancet tip. The lancet tip is surrounded by a sterile protective element which is at least partially made of a material which is prone to embrittlement, wherein the sterile protective element has a lysis groove in the material which is prone to embrittlement and is ruptured at the lysis groove by the lancet tip during the puncturing process in order to release the lancet tip.

The lancet system according to the invention has at least one lancet with a lancet tip. According to a preferred embodiment of the invention, the lancet system comprises a large number of lancets. In this case, the lancet system is inserted as a magazine for lancets into a lancing aid.

The lancet tip penetrates into the tissue during regular use of the lancet system for discharging body fluid, in particular blood or fluid from the interstitial spaces of the tissue. The lancet tip can be configured, for example, rotationally symmetrical. One or more sharpening tips may also be mounted on the lancet tip. The edge provided for this purpose, which is inclined with respect to the longitudinal axis of the lancet tip and tapers toward the piercing tip, serves as a sharp cutting edge during the piercing operation and advantageously causes less pain during the piercing process than when piercing with a rotationally symmetrical lancet tip.

The sterile protection of the lancet system according to the invention shields the lancet tip in the unused state in a sterile-tight manner, so that germs cannot reach the lancet tip until the lancet system according to the invention is used. After suitable sterilization, the lancet tip remains in the sterile protection in a sterile state for a long time. The sterile protection element can be, for example, a hollow body which surrounds the lancet tip. The lancet tip can also be embedded in the sterile protection, wherein the sterile protection can be produced, for example, by means of an injection molding method by means of a press-fit encapsulation of the lancet tip.

The sterile protection is at least partially made of a material that has a tendency to crack. One such material has the property of exhibiting substantially no permanent shape change upon a forceful action prior to rupture thereof. The yield point of the brittle-like material is preferably approximately equal to its fracture limit. For steel, having a thickness of about 500N/mm²The brittle-fracture prone material preferably has a yield point of less than 50N/mm for the lancet tip of²The yield point of (a). Preferably, the material with a tendency to brittle fracture has a high brittleness and a low strength, so that less energy is required to break the sterile protection at the lysis trough. In particular, the material that is prone to cracking should be relatively soft in relation to the material of the lancet tip/lancet needle section, so that the lancet tip/lancet is not damaged when the material that is prone to cracking breaks. For lancet tips, for example made of steel, having a vickers hardness of about 250, the vickers hardness of the brittle fracture-prone material is preferably below 25.

The lancet system according to the invention has a cleavage groove in the material that is prone to brittle fracture, at which the material breaks under force and thus releases the lancet tip for the puncturing operation. The advantage of such a configuration according to the invention of the sterile protection of the lancet system is that the sterile protection can be opened by the lysis trough without a great deal of force by rupturing, and the lancet tip can be moved (for example, protruding from the hollow body or the puncture aid) largely without friction when the sterile protection is opened. The lancing device for puncturing procedures, in which the lancet system according to the invention is accommodated, therefore does not require a powerful drive mechanism and its wear is low.

According to the invention, the sterile protection is partially punctured by the lancet tip or the entire lancet needle. For this purpose, the lancet needle part, in particular the lancet tip, exerts a force on the material which is prone to brittle fracture. This has the advantage that the sterile protection does not have to be opened and removed manually with great effort, but is punctured by the lancet needle part automatically when the puncturing process is carried out.

According to a preferred embodiment of the invention, the material of the sterile protection which has a tendency to brittle fracture is a thermoplastic containing a filler, a metal soap containing a filler or a wax containing a filler. The thermoplastic can be processed in the softened state into shaped parts by pressing, extrusion, injection molding or other shaping methods. Furthermore, the properties of the thermoplastics can be modified by the addition of fillers. In the present invention, the brittleness of the thermoplastic, wax or metal soap is preferably adjusted by means of a filler for obtaining a material with a tendency to brittle fracture, from which the sterile protection or a part thereof can be manufactured. The melting point of the brittle-like material should preferably be more than 70 ℃ in order to be able to store the sterile protection without problems.

The filler is preferably selected from the group of materials consisting of talc, graphite and molybdenum disulfide. The wax is then preferably selected from the group of materials consisting of paraffin wax, hard fat, synthetic waxes such as PE (polyethylene) wax and natural waxes such as beeswax. The metal soaps are salts of the metals Al (aluminum), Ba (barium), Ca (calcium), Cd (cadmium), Co (cobalt), Cr (chromium), Cu (copper), Fe (iron), Mg (magnesium), Mn (manganese), Ni (nickel), Pb (lead), Sn (tin), Sr (strontium) and Zn (zinc) with higher fatty acids, resin acids or naphthenic acids (stearate, palmitate, oleate, linoleate, laurate. The metal soaps in the context of the invention are preferably selected from the group of materials consisting of aluminum stearate, aluminum palmitate, calcium stearate, calcium palmitate, magnesium stearate, magnesium palmitate, zinc stearate or zinc palmitate, particularly preferably aluminum stearate (aluminum monostearate, aluminum distearate or aluminum tristearate, depending on the type), calcium stearate or magnesium stearate. The thermoplastic is then preferably selected from the group of materials consisting of polyethylene and polypropylene. For materials with a tendency to brittle fracture, especially soft thermoplastics (such as polyethylene) are suitable, which are filled with a high content of talc. Talc is a soft material that does not damage the sharpened tip of the needle tip when the brittle material breaks). The talc particles are in this case very suitable for reducing the internal strength of the thermoplastic, wax or metal soap, so that the viscoelastic properties can be shifted in the direction of brittleness without increasing the hardness of the plastic, wax or metal soap. The filler content in the thermoplastic is preferably greater than 20 percent by volume, particularly preferably between 20 and 50 percent by volume.

According to a preferred embodiment of the invention, the lysis groove extends parallel to the lancet tip and over at least a part of the length of the sterile protection. The sterile protection element can be, for example, a cylindrical housing which rests on the lancet tip. The lysis trough preferably extends in the direction of the outer side of the cylindrical housing. In this case, the lysis trough may extend along the entire length of the outer side or only along a part of the length of the outer side (in the region of the lancet tip).

According to a preferred embodiment of the invention, the lysis groove delimits a partial region of the sterile protection which, after the sterile protection has been broken at the lysis groove, rises away from the lancet tip. Preferably, the raised local region of the sterile protection element, after being ruptured, adheres to the lancet tip so that it does not fall out of the lancet system in an uncontrolled manner. In this case, the sterile protection can be made, for example, in a section in which the lysis trough delimits the partial regions, from the material with a tendency to brittle fracture, and in a section adjoining the aforementioned section from a plastically deformable material, so that the region of the plastic material that is brittle fracture at the lysis trough is held in a state raised above the lancet tip. However, the sterile protection can also be made entirely of a material that has a tendency to crack, wherein the regions delimited by the lysis groove, although separating from one another at the lysis groove when they are ruptured, remain connected to the part of the sterile protection that does not have any lysis groove and in this case are tilted away from the lancet tip at an optionally small angle. The advantage of providing such regions which, after the sterile protection has been broken, rise away from the lancet tip is that these regions cannot fall loose after the lancet tip has been released, for example in the hollow body or the lancing aid, and interfere with the movement of the lancet tip.

According to a preferred embodiment of the invention, the lancet system comprises a lancet needle part which in turn comprises the lancet tip and a needle body, wherein the needle body is at least partially enclosed by the lancet body. The lancet body can be fixedly connected to the needle body or the needle body can be moved (for carrying out the puncturing operation) relative to the lancet body. The lancet body may partially or completely surround the needle body. The lancet needle part of the lancet system according to the invention is made of a sufficiently hard material to withstand mechanical or other loads that may occur during the puncturing process, in particular during the breaking of the brittle material, and during the processing steps without deforming. Furthermore, the material must be provided such that no particles break or fall off the lancet needle part during the puncturing process. Finally, the lancet needle section material must also be processed in such a way that the lancet tip can be ground sufficiently sharp and the edges of the lancet tip can be ground sufficiently sharp, if necessary. Materials which are very suitable for the lancet needle part are, above all, metals and, among these, in particular high-grade steel. The lancet may also be made of ceramic or plastic.

According to a preferred embodiment of the invention, the lancet system according to the invention comprises a hollow body which surrounds at least the lancet tip, wherein the lancet tip can be moved in the hollow body. The hollow body surrounding at least the lancet tip serves to prevent the user from accidentally injuring the lancet tip, in particular when the lancet tip is returned into the hollow body again after a puncturing operation has been completed. The lancet tip can be moved in the hollow body so that it can be extended out of the hollow body for the puncturing operation. Preferably, the hollow body has an exit opening through which the lancet tip can protrude during the puncturing operation, wherein the lancet tip can be returned into the hollow body after the puncturing operation.

In a preferred embodiment of the invention, the hollow body is tubular, wherein its two ends have openings which can be opened or closed. For example, both ends are closed by a penetrable membrane made of an elastic or plastic material, which can be opened during the puncturing process. One of the two openings serves as an exit for the lancet tip during the puncturing process. The other opening is used to introduce an actuating element (e.g., a push rod or catch) that is provided to move the lancet tip during the puncturing procedure.

The lancet body can be moved relative to the hollow body or is fixedly connected to the hollow body. In the first case, the lancet needle part is preferably fixedly connected to the lancet body, and in the second case the lancet needle part can be moved in the hollow body relative to the lancet body. The lancet body may act as a guide for the lancet.

In a preferred embodiment, a hollow body completely surrounds the lancet body and the lancet tip, wherein the lancet body and the lancet tip are jointly movable in the hollow body. In this case, the lancet body and the lancet tip are preferably movable in a longitudinal direction with respect to the lancet tip.

In order to move the lancet tip and the lancet body separately or jointly, suitable structural measures (such as an actuating element, a drive element or a holding element) can be provided in a lancing aid in which the lancet system according to the invention is used.

According to a preferred embodiment of the invention, the sterile protection element can be moved away from the lancet tip on the lancet needle part after the rupture at the lysis groove. In this case, the sterile protection is broken in the region of the lancet tip at its lysis groove in order to release the lancet tip for the puncturing process, but in a further region remains intact and maintains the connection between the broken parts and leaves the lancet tip on the lancet needle part. This configuration of the lancet system according to the invention has the advantage that the sterile protection does not fall loose during the puncturing process, for example in the hollow body or the puncturing aid, and interfere with the puncturing process.

In order to be able to break the sterile protection at the lysis groove by the lancet needle portion or the lancet tip, the lancet or lancet tip must exert a force on the material which is prone to brittle fracture in the region of the lysis groove. In one embodiment, the sterile protection is fastened to the inside of the hollow body and the lancet needle portion or the lancet tip is guided through the material of the sterile protection which has a tendency to crack. In contrast, the lancet tip together with the sterile protection element can be moved in a body (for example in a hollow body or in a lancing aid) so that the sterile protection element is a surface, in particular an inner surface, which is broken at the lysis trough and can impact the body (for example the hollow body or the lancing aid) and the lancet tip can be passed through the sterile protection element in the process. In this case, the sterile protection (for example, in the form of a cylindrical housing) is moved together with the lancet tip until it strikes a surface, in particular an inner surface, of the hollow body or of the lancing aid and is broken there and/or is arrested by the inner surface, so that the lancet tip passes through the sterile protection. The lancet tip then protrudes through an outlet opening in the hollow body or the lancing aid for carrying out the puncturing operation.

The invention further relates to a lancet system, which is designed as a magazine and has at least two lancets, each of which has a lancet tip and is contained in a single, mutually independent needle chamber of the lancet system, wherein the lancet tips can be moved in the needle chambers. The lancet tip is in this case surrounded in the needle chamber by a sterile protection which is at least partially made of a brittle material, wherein the sterile protection has a lysis groove and is ruptured by the lancet tip during the puncturing process at the lysis groove for releasing the lancet tip.

The lancet system provided as a magazine is used for storing unused and used lancets. The needle chamber of the magazine takes over the function of the optionally present hollow body of the lancet system according to the invention described above. The needle chambers are preferably arranged geometrically regularly in the magazine, wherein adjacent needle chambers may have a common wall. The magazine may, for example, be designed in the form of a stack, a disk or a drum.

Until use, the lancet tips are stored in their respective sterile protection in a sterile state. During the puncturing process, the brittle material of the sterile protection is broken by the lancet needle part, in particular by the lancet tip, at the lysis groove, so that the lancet tip is released for the puncturing process. To this end, the lancet tip projects out of its needle chamber through an outlet opening. After the puncturing operation, the lancet tip is returned to the needle chamber through the outlet opening, thereby preventing accidental injury and environmental infection caused by the lancet tip. The advantages produced by the lancet system according to the invention having at least two lancets, which serves as a magazine, are furthermore comparable to the advantages already described for the lancet system according to the invention.

The invention further relates to a lancing device comprising at least one lancet system according to the invention and an actuating element which can act on the lancet system for displacing the lancet tip, for example, in the hollow body, the lancing device or the needle chamber, so that the lancet tip can puncture the sterile protection at the lysis trough for carrying out the puncturing operation and can project from the hollow body, the lancing device or the needle chamber. The lancet system according to the invention is inserted individually by the user in the lancing device. For example, a large number of lancets (stored in a lancet system according to the invention as a magazine) can be provided in the lancing aid. An actuating element (e.g., a push rod or a catch) contained in the lancing aid acts on the lancet in the lancing aid for breaking the brittle material at the lysis trough and for moving the lancet tip for the puncturing process. Furthermore, the actuating element can be used to return the lancet tip into its hollow body, into the lancing aid or into its needle chamber after a puncturing operation. However, for this purpose, a further element (for example a spring) can also be provided in the lancing aid.

Drawings

The invention is explained in detail below with the aid of the figures. Wherein:

FIG. 1 is a schematic sectional view of a lancet system according to the invention and a schematic flow chart of a puncturing process with this lancet system,

fig. 2 shows the lancet body, the lancet needle part and the sterile protection of the lancet system according to fig. 1.

Detailed Description

The lancet system 1 shown in fig. 1 has a lancet tip 2, a lancet body 3 and a hollow body 4. Fig. 1a) shows the lancet system 1 before use. The lancet tip 2 is surrounded in the hollow body 4 in a sterile-tight manner by a sterile protection 5, which sterile protection 5 is at least partially made of a material that has a tendency to brittle fracture. The sterile protection 5 is a cylindrical housing which rests on the lancet tip 2 and has a lysis groove (not shown in fig. 1).

The lancet system 1 comprises a lancet needle part 6, which lancet needle part 6 comprises the lancet tip 2 and a needle body 7, wherein the needle body 7 is partially enclosed by the lancet body 3. The lancet body 3 serves as a guide for the lancet needle part 6 movably arranged in the hollow body 4. The hollow body 4 is tubular in shape and has a first opening 9 arranged at a first end 8 facing away from the lancet tip 2 and a second opening 11 arranged at a second end 10 facing the lancet tip 2. The hollow body 4 completely encloses the lancet body 3, the lancet needle part 6 and the sterile protection 5, wherein these three components can be moved together in the hollow body 4 in the longitudinal direction. For example, an operating element 12 is provided in the lancing device according to the present invention for operating the lancet system 1 to perform a puncturing operation.

Fig. 1b) shows a puncturing operation carried out with a lancet system according to the invention. For this purpose, the actuating element 12 is moved into the hollow body 4 through the first opening 9. The actuating element 12 exerts a force in the puncturing direction 13 on the lancet body 3, the lancet needle part 6 and the sterile protection 5. These components of the lancet system 1 are thus removed toward the second opening 11 of the hollow body 4 until the sterile protection element 5 strikes the inner surface 14 of the hollow body 4 surrounding the second opening 11 and the lancet tip 2 passes through the sterile protection element 5. In this case, the brittle material of the sterile protection 5 breaks at the lysis groove and thereby releases the lancet tip 2. The lancet tip 2 protrudes from the hollow body 4 through the second opening 11 serving as an outlet and produces a puncture, for example, in a finger of a user. The sterile protection 5 is in the process moved away from the lancet tip 2 on the lancet needle part 6. The sterile protection 5 breaks in the area of the lysis groove 15, remains intact in the area of the no lysis groove 16, and continues to surround the lancet needle part 6, where it can move over this lancet needle part 6. In this way, no loose fragments of the sterile protection 5 are present in the hollow body 4.

Fig. 1c) shows the lancet tip 2 pulled back into the hollow body 4 through the outlet opening 11 after the puncturing operation. For example, the retraction can be performed by means of the actuating element 12, which actuating element 12 is attached to the lancet body 3 (for example, is snapped together with the lancet body 3) and is pulled in the return direction 17. By means of the hollow body 4, which now again encloses the lancet tip 2 in a protective manner, the risk of injury due to the used lancet tip 2 is avoided, and environmental infections due to residual body fluid adhering to the lancet tip 2 are likewise avoided.

Fig. 2 shows the lancet body 3, lancet needle portion 6 and sterile protector 5 of the lancet system 1 of fig. 1 prior to use (fig. 1 a)). For illustration, these components of the lancet system 1 are shown without the hollow body 4 enclosing them. The sterile protection 5 surrounds the lancet tip 2 (not shown here) in a sterile-tight manner. The sterile protection 5 has a lysis groove 18, which lysis groove 18 extends parallel to the lancet tip 2 and only over approximately two thirds of the length of the sterile protection 5. At least the region 15 of the sterile protection 5 with the lysis trough 18 is made of a material that has a tendency to brittle fracture, in particular polyethylene filled with a high content of talc. The lysis groove 18 delimits partial regions 19 of the sterile protection 5, which partial regions 19 are tilted away from the lancet tip 2 after the sterile protection 5 has been ruptured at the lysis groove 18 (see fig. 1 b)). The non-groove-free region 16 of the sterile protection 5 does not break during this process, but continues to surround the lancet needle part 6, and the sterile protection 5 can then be moved on the lancet needle part 6 away from the lancet tip 2 in the direction of the lancet body 3 (see fig. 1 b)).

List of reference numerals

1 Lancet System

2 lancet tip

3 Lancet body

4 hollow body

5 sterile protection

6 lancet needle part

7 needle body

8 first end of hollow body

9 first opening

10 second end of hollow body

11 second opening, outlet

12 operating element

13 directions of penetration

14 inner surface

15 zone of the sterile protection with lysis trough

16 area of the sterile protection element without lysis trough

17 direction of return

18 cracking tank

19 local area

Claims (13)

1. Lancet system (1), comprising at least one lancet with a lancet tip (2), wherein the lancet tip (2) is enclosed in a hollow body (4) or another body by a sterile protective element (5), wherein the sterile protective element (5) is at least partially made of a material having a tendency to fray, wherein the sterile protective element (5) has a lysis groove (18) in the material having a tendency to fray and is intended to release the lancet tip (2) during a puncturing procedure by the lancet tip (2) breaking at the lysis groove (18);

the lancet tip (2) can be moved in the hollow body (4) or in another body in such a way that the sterile protection (5) can impact the inner surface (14) of the hollow body (4) or of the other body in order to break at the lysis groove (18), and the lancet tip (2) can be passed through the sterile protection (5) in the process.

2. Lancet system according to claim 1, characterized in that the hollow body (4) has an outlet opening (11), through which outlet opening (11) the lancet tip (2) can protrude during the puncturing operation, wherein the lancet tip (2) can be returned into the hollow body (4) after the puncturing operation via the outlet opening (11).

3. Lancet system according to claim 1, characterized in that the brittle rupture-prone material of the sterile protection (5) is a filler-containing thermoplastic, a filler-containing wax or a filler-containing metal soap.

4. A lancet system as in claim 3, wherein said filler is at least one material selected from the group consisting of talc, graphite and molybdenum disulfide.

5. Lancet system according to one of claims 3 or 4, characterized in that the thermoplastic is a thermoplastic selected from the group of materials such as polyethylene or polypropylene.

6. Lancet system according to claim 1, characterized in that the lysis trough (18) extends parallel to the lancet tip (2) and at least over a part of the length of the sterile protection (5).

7. Lancet system according to claim 1, characterized in that the lysis groove (18) delimits a partial region (19) of the sterile protection (5), wherein the partial region (19) is tilted away from the lancet tip (2) after the sterile protection (5) has been broken at the lysis groove (18).

8. Lancet system according to claim 1, characterized in that the sterile protection (5) is a cylindrical housing which rests on the lancet tip (2).

9. Lancet system according to claim 1, comprising a lancet needle part (6), wherein the lancet needle part (6) comprises the lancet tip (2) and a needle body (7), wherein the needle body (7) is at least partially enclosed by the lancet body (3).

10. Lancet system according to claim 9, characterized in that the lancet body (3) serves as a guide for the lancet needle part (6).

11. Lancet system according to one of claims 9 or 10, characterized in that the sterile protection (5) can be removed from the lancet tip (2) on the lancet needle part (6) after breaking at the lysis groove (18).

12. Lancet system having at least two lancets, each having a lancet tip (2) and each being contained in a single, separate needle chamber of the lancet system, wherein the lancet tips (2) can be moved in the needle chambers, characterized in that the lancet tips (2) are enclosed in the needle chambers by a sterile protection (5), which sterile protection (5) is at least partially made of a material having a tendency to crack, wherein the sterile protection (5) has a cracking groove (18) and is ruptured by the lancet tips (2) during a puncturing operation at the cracking groove (18) for releasing the lancet tips (2), wherein the sterile protection (5) can strike an inner surface (14) of the needle chamber for rupturing at the cracking groove (18), and the lancet tips (2) can be passed through the sterile protection (5) during the puncturing operation.

13. Lancing device comprising an actuating element (12) and at least one lancet system according to one of claims 1 to 12, the actuating element (12) being able to act on the lancet system for displacing the lancet tip (2) in such a way that the lancet tip (2) can break the sterile protection (5) at a lysis trough (18) for carrying out a puncturing procedure.