WO2002053045A1

WO2002053045A1 - Catheter puncturing device

Info

Publication number: WO2002053045A1
Application number: PCT/EP2001/015361
Authority: WO
Inventors: Rosemarie Eckert; Bernd Tietze
Original assignee: Tietze Medical Gmbh
Priority date: 2001-01-03
Filing date: 2001-12-28
Publication date: 2002-07-11
Also published as: DE10100102C2; DE10100102A1

Abstract

The invention relates to a catheter puncturing device comprising a tubular housing having a longitudinal housing section which terminates in an extended section and from which a forked section branches off at an angle, the housing section and the forked section comprising a continuous lateral opening; a flexible casing which extends along the forked section and the housing section, which closes the lateral opening, and into which a catheter can be inserted; and a puncturing needle which protrudes out of the housing with its tip and extends along the longitudinal housing section and the extended section. After the puncture has been carried out, said puncturing needle can be retracted in the housing until it is behind the branching off point of the forked section, and the catheter can then be removed from the housing via the forked section and the housing section.

Description

Catheter puncture set

The invention relates to a catheter puncture set.

A catheter is usually placed according to the "Seldinger" method. Here, the vessel into which the catheter is to be inserted is first punctured with a hollow puncture needle. A guide wire is then inserted into the vessel through the hollow puncture needle, after which the hollow needle is over The guidewire is then withdrawn again, then the guidewire is advanced and the vessel is expanded using a dilator that is pushed over the guidewire. After the dilator has been removed, the actual catheter is threaded over the guidewire and inserted into the vessel and moved into the desired end position The guidewire is then withdrawn through the catheter

As a result, this method allows the catheter to be inserted, but is extremely cumbersome. A large number of different handles and instruments are required to insert the catheter. Furthermore, due to the multiple insertion and removal of various objects, there is a risk that other objects or people will be contaminated with blood. Finally, there is a risk of air embolism if there is a slight negative pressure in the punctured vessel.

The invention is therefore based on the problem of specifying a puncture set that makes it easier to place a catheter.

For this purpose, the invention provides a catheter puncture set, comprising:

a tubular housing with an elongated housing section which merges into an extension section and from which a branch section branches off at an angle, the housing section and the branch section having a continuous lateral opening, a flexible sheath, which extends along the branch section and the housing section and closes the side opening, into which a catheter can be inserted, and a puncture needle which emerges from the housing with its tip and extends along the elongated housing section and the extension section, the housing can be drawn in behind the branching point of the branching section and then the catheter can be pushed out of the housing via the branching section and the housing section.

The puncture set according to the invention represents a quasi-closed system that does not require a guide wire and other additional dilatation devices and the like. Rather, in the cutlery according to the invention, only the vessel is punctured with the puncture needle protruding from the housing, the housing being pushed into the vessel as well. To ensure this in a particularly simple manner, the housing tip, the jacket tip and the needle tip can form an essentially conical shape with one another in the puncture position, which enables simple insertion. After the puncture, blood enters the puncture needle, which according to the invention can open into a blood collection container which can be moved together with it. This blood collection container, which is expediently made of a transparent plastic, allows the successful puncturing to be recognized immediately when blood is accumulating therein. After the puncture, the puncture needle is withdrawn, the housing section and the jacket located therein remain in the punctured vessel and seal it from the outside. The puncture needle is pulled past the branch point of the branch section, so that access from the branch section to the housing section is released. Subsequently, only the catheter has to be pushed into the housing section via the branch section and then directly from the housing into the punctured vessel and pushed as far as desired. To remove the housing, it is then pulled out of the patient, after which the jacket is pulled out of the laterally open housing and detached from the catheter. The catheter is then exposed. Obviously, with the catheter puncture set according to the invention, a catheter can be placed much more easily and with far fewer hand movements than is the case with the prior art according to "Seidinger". A further advantage is that it is a quasi closed system in that it is a leak blood is largely avoided.

According to the invention, the puncture needle itself can be accommodated in a needle tube which only releases the needle tip and which can be moved together with the needle with respect to the housing. It is particularly advantageous if the puncture needle can only be pulled out of the housing up to a first stop. By means of this stop, it is advantageously avoided that the pointed puncture needle contaminated with blood is pulled completely out of the housing and represents a source of danger which could injure the hospital staff or the doctor. Rather, the puncture needle can only be moved up to the stop in the housing. If the puncture needle is also received in the needle tube, it is completely encapsulated, which is even more advantageous for safety reasons. This configuration also fulfills in some countries, such. B. existing safety regulations in the USA, according to which puncture needles and the like must be stored immediately after use to avoid injury.

It is particularly advantageous if a blocking element is provided to prevent the drawn puncture needle from being inserted again. This prevents the puncture needle from being pushed into the vessel again due to careless movement or by mistake, which can then be injured if necessary. It is also not possible to push the needle out after the catheter has been inserted and the housing has been removed. The first and / or the second stop can be formed by means of a projection which is formed on the needle tube and which abuts a corresponding counter bearing on the housing. As described, the puncture needle advantageously opens into a blood collection container. If the needle is now withdrawn, it is at least partially filled with residual blood, which can sometimes drip from the needle after being withdrawn. In order to avoid this, it has proven to be expedient if means on the container side are provided for sucking up residual blood located in the puncture needle. These means can be designed in a simple manner in the form of a flexible and curved lid closing the blood collecting container, which can be moved between a position in the blood collecting container and an outwardly curved position. For puncturing, the lid is curved inwards, after pulling the needle the flexible lid is pulled outwards, so that a negative pressure is created in the container, which sucks the residual blood from the puncture needle into the container. Furthermore, it is expedient if connection means for a syringe or the like are provided in the interior of the blood collection container, which make it possible, if necessary, for. B. in an emergency immediately after the puncture of the vessel via the puncture needle a drug or the like.

Furthermore, it is expedient if, according to the invention, locking means are provided for locking the puncture needle in its puncture position against being drawn into the housing. These locking means, which according to an embodiment of the invention comprise a threaded attachment provided on the extension section, with which a counter bearing provided on the blood collection container cooperates, prevent the puncture needle from being accidentally pushed into the housing during the puncture and the puncture can no longer be continued. Furthermore, a sealing element that seals the blood collection container can be provided on the extension section.

The flexible jacket can cross-section z. B. be semicircular, so that it can be used safely and firmly in the housing section and the branch section and on the other hand securely seals to the outside. If the sheath is pulled out of the housing after the catheter has been inserted, the catheter is automatically exposed. Alternatively, the jacket can also be tubular and slotted. In this case, the sheath is quasi closed, but when pulled out, it can be removed from the catheter due to the longitudinal slot that the Coat goes through, be peeled off. Depending on how far the sheath is closed, it is expedient to provide an opening on the sheath in the region arranged in the branch area through which the puncture needle, which may be guided in the needle tube, enters the sheath.

Furthermore, it is advantageous if a clamping section is provided on the jacket region arranged in the branch section and is clamp-retained in a clamping section formed on the branch section. With this clamping section it is possible to fix the casing in its position with respect to the housing.

According to an advantageous development of the concept of the invention, it can be provided that a hold-down device for releasably holding the clamp of an inserted catheter is provided on the jacket end located in the branch section. This hold-down device enables the catheter inserted into the branch section to be clamped in position. This makes it possible to completely prefabricate the catheter puncture set, that is to say to insert the catheter already in the branch section and to hold it there with the clamping section. The doctor placing the catheter therefore does not have to first thread the catheter into the branch section, but only has to loosen the clamping section and can then insert the catheter into the vessel immediately after withdrawing the puncture needle.

The clamping section and / or the hold-down device can expediently be formed by means of one or more radially projecting ribs which, like the jacket, likewise consist of flexible material, in particular a soft plastic. The hold-down device itself can be connected via a tab so that it cannot be lost.

Furthermore, it is expedient if a sealing element which seals towards the inserted catheter is provided at the end of the essentially tubular jacket located in the branch section, so that contamination of the vessel is also excluded from this side. As already described, it is expedient if, for easy insertion of the housing after puncturing the vessel, the housing tip, the jacket tip and the needle tip form an essentially conical shape with one another. In order to achieve the smoothest possible transition in the transition region of the housing puncture needle, it is expedient if a depression is provided on the needle, into which the front edge of the elongate housing section engages essentially flush. This depression also has a locking effect because - regardless of the locking option provided on the container anyway - the puncture needle cannot be withdrawn as long as the housing engages in the depression. Pulling back is only possible after slight twisting and loosening of the procedure.

The tip of the jacket itself is expediently designed to be flexible and flap-like with a tapering shape in order to achieve the conical shape. The flexible and flap-like design is also advantageous in that catheters with different numbers of lumens can be placed with the puncture set according to the invention, these catheters then necessarily having different thicknesses. The flexible jacket tip adapts easily to the respective catheter thickness. In order to enable simple movement of the jacket tip, it is expediently articulated on the adjoining jacket body via a film hinge.

As already described, the jacket and the housing are designed to accommodate a single-lumen or multi-lumen catheter, the use of the flexible jacket, which can be selected in terms of its inner diameter depending on the catheter to be inserted, being particularly advantageous here.

Furthermore, it is advantageous if a protective sleeve which is pushed over the elongated housing section and is releasably locked is provided, which protects the housing section and the jacket located therein from contamination after removal from the sterile packaging in which the puncture set is pre-assembled. The entire puncture set consists of with the exception of the puncture needle made of plastic and can be produced easily and inexpensively.

Further advantages, features and details of the invention result from the exemplary embodiment described below and from the drawings. Show:

1 is a perspective view of a catheter puncture set according to the invention,

2A, 2B two perspective views of the housing of the puncture set,

3 shows an enlarged illustration of the fastening area of the blood collecting container,

4A, 4B are two perspective views of the blood collection container with a needle tube formed thereon,

5 is an enlarged view of the needle tube tip,

6A, 6B two perspective views of the lid of the blood collection container,

7A, 7B two perspective views of the flexible jacket,

8 is an enlarged view of the jacket tip,

9 is a sectional view through the clamping area of the jacket,

10 is a sectional view through the puncture set according to FIG. 1,

11 is a sectional view through the area of the puncture cutlery tip, Fig. 12 is a perspective view of the puncture set from Fig. 1 after retracting the puncture needle, and

FIG. 13 is a perspective view of the puncture set from FIG. 12 after the jacket has been removed from the housing.

Fig. 1 shows a catheter puncture set 1 according to the invention, consisting of a tubular housing 2 with an elongated housing section 3, which merges into an extension section 4, and from which a branch section 5 branches at an angle, the housing section 3 and the branch section 5 having a continuous lateral section Have opening 6, which in the example shown is closed by means of a flexible jacket 7, which extends along the branch section 5 and the housing section 3. A catheter 8 can be inserted into the flexible jacket 5.

The puncture set 1 further comprises a puncture needle 9, of which only the tip is visible in FIG. 1. The hollow, metal puncture needle 9 extends along the elongated housing section 3 and the extension section 4 and opens into a blood collection container 10, where the blood flowing through the puncture needle collects after puncturing the vessel. The blood collection container 10 is closed by means of a lid 11. As FIG. 1 also shows, a protective sleeve 40 can be clipped onto the elongated housing section 3 and is pulled off here.

In the following, the individual parts of the puncture set 1 are explained, then the function of the puncture set will be discussed.

2A, 2B show the housing 2 on its own in different perspective views. The lateral opening 6, which extends along the housing section 3 and the branch section 5, is clearly recognizable. On the branch section 5, a clamping section 12 is formed at the end, in which the jacket can be releasably clamped by means of suitable clamping sections formed thereon. The lateral opening 6 also extends continuously along this clamping section 12.

2B and 3 show the extension section 4 more clearly. A handling section 13 is formed on the extension section 4 in the form of a handle, by means of which the cutlery can be gripped and guided. At the free end of the extension section, on the one hand, a locking means is formed in the form of a threaded attachment 14, with which a counter bearing formed on the blood collection container 10 interacts in such a way that the blood collection container can be firmly held on the extension section 4 by briefly rotating it and must be rotated in the opposite direction to remove it , Furthermore, a sealing element 15 is provided, which seals the interior of the housing from the bottom of the blood collection container 10.

The blood collection container 10 itself is shown in detail in FIGS. 4A, 4B. It has an essentially cylindrical shape, and a further handling section 16 is formed on it, which lies congruently behind the handling section 13 when the blood collection container is attached. Both handling sections can be gripped using two fingers.

At the bottom of the blood collection container, on the one hand a counter bearing 17 cooperating with the threaded attachment is provided in the form of the circular projection. Furthermore, a needle tube 18 extends from the bottom of the container 10, in which the puncture needle 9 is received completely encapsulated, the needle tip only protrudes a short distance from the needle tube tip 19. 4A shows a connection means 41 formed in the interior of the blood collection container 10 for a third object, e.g. B. a syringe that can be connected there, and via which it is possible, in an emergency, after the puncture needle has been placed in the vessel, to either deliver a medication via the puncture needle itself, or to take blood into the syringe via the puncture needle. As can be seen from the enlarged detailed view in FIG. 5, a circumferential stop 20 is formed on the needle tube 18, which abuts a corresponding counter stop formed in the housing (either in the housing section or in the extension section) when the puncture needle is pulled out. The puncture needle is firmly connected to the blood collection container 10, that is, the blood collection container has to be loosened and pulled out to pull out the puncture needle, whereby the puncture needle together with the needle tube are also moved. However, it can only be pulled out until the stop 20 strikes the counter stop on the housing side.

5 also shows a blocking element 21, which is embodied on the needle tube and is realized as a spring tongue, and prevents the puncture needle from being pushed in again after being pulled out. The position of the stop 20 and of the counter-stop are selected so that when these two interact, it is ensured that the resilient locking element 21, which is still pushed in during pulling out, is pulled out of the housing and can snap outwards. This means that it protrudes from the outer surface of the needle tube 18. If the puncture needle is now pushed back again, the protruding blocking element strikes the housing, preventing further pushing in.

6A, 6B show the cover 11 in detail. This consists of a curved, flexible and disc-shaped cover section 22, on the inside of which a circumferential bead 23 is formed, which engages behind an annular projection 24 formed on the blood collecting container. A plunger or handle is formed on the cover element 22. With this handle, it is possible to pull the flexible lid section 22, which is arched inward in the puncture position toward the inside of the container, so the lid section 22 snaps from the inside outward in relation to its direction of curvature. This means that the container volume is increased and a negative pressure is generated there. This negative pressure makes it possible to draw any blood still in the puncture needle into the container. 7A, 7B show the jacket 7 in detail. The jacket 7 has a tubular cross section in the exemplary embodiment shown. It consists of a first jacket section 25, which is arranged in the elongated housing section 3, and a second section 26, which is positioned in the branch section 5. Furthermore, a clamping section 27 is arranged on the second section 26 and is clamped in the clamping section 12 on the housing side. For this purpose, radially projecting clamping ribs 28 are formed. Furthermore, a hold-down device 30 is connected to the clamping section 27 via a tab 29, which is also pressed into the clamping section 12 and via which the catheter (see FIG. 1), which is already inserted during the pre-assembly, is clamped. This hold-down device 30 is pulled out of the clamping section 12 by simply pulling the tab, so that the catheter is released and can be moved.

As shown in FIG. 7B, the jacket 7 is slit over its entire length by means of a longitudinal slot 31. This longitudinal slot 31 also extends to the end of the front part of the clamping section 27, where the catheter is guided in the tubular interior of the jacket 7. This longitudinal slot serves to detach the sheath 7 from the catheter 8 inserted after the puncture, that is to say that the sheath is simply separated from the catheter 8 by pulling on the tab, which is then pulled out of the longitudinal slot.

7B shows an opening 32 which is arranged in the bend region where the two sections 25 and 26 merge into one another. The puncture needle or the needle tube surrounding it is introduced into the sheath via this opening. At the end of the closed, tubular section of the jacket 7, a sealing element 33 is formed, which seals towards the outside of the inserted catheter.

8 finally shows the front end region of the jacket 7 in an enlarged representation. The jacket tip 34 is clearly shown, which tapers towards the front and is rounded. The jacket tip is hinged to the adjoining jacket body via a film hinge 35. This enables that the sheath tip adapts exactly to the catheter even when the catheter is inserted a little thicker, for example if it has more than one lumen.

FIG. 9 shows a section through the region of the clamping section 27 of the jacket 7. The line 36 exemplarily represents the center line of a pre-assembled catheter. The catheter is pushed a little way into the tubular interior of the jacket 7. Via the hold-down device 30, which likewise consists of a series of ribs, the catheter is pressed against the inner wall of the clamping section 12 and is thus fixed in its position so that it cannot fall out as part of the normal handling of the puncture set. To release the hold-down device, the tab 29 is simply pulled, the jacket 7 itself, of course, also being pulled out of the housing or then detached from the catheter via this tab.

10 shows a section through a functional puncture set. The compact structure consisting of the housing 3, the jacket 7 located therein and the needle tube 18 guided inside the jacket and containing the puncture needle 9 can be seen. The puncture needle 9 opens directly into the blood collection container 10. FIG. 10 also shows the two different positions of the ckels 11 when it is arched to the inside of the container or is drawn out to suck up the residual blood.

11 shows an enlarged view of a section through the tip of the puncture set. The housing section 3 is shown, which tapers in the pointed region 37. The casing section 3 is followed by the jacket 7, the sectional view here being placed exactly through the longitudinal slot 31. Inside the jacket 7 is the needle tube 18 and the puncture needle 9 located therein, which emerges on the tip side. The puncture needle 9 has a notch 38 into which the front end of the housing tip 37 engages. On the one hand, this additionally locks the puncture needle against unintentional pushing back, and on the other hand, this results in a relatively smooth and smooth transition zone without an excessively strong edge. As described, the entire tip of the puncture set is inserted into the vessel for puncturing, so that it is necessary to lent to train without edges. For this purpose, the jacket tip 34 already described is also designed accordingly, which has a suitable front-side recess 39 which lies around the needle. Overall, as shown in FIG. 11, the cutlery tip is essentially tapered.

The handling of the puncture set according to the invention is explained below with reference to FIGS. 12 and 13 in conjunction with FIG. 1:

After the protective cover 40 has been removed, the cutlery tip is inserted into the patient and an attempt is made to puncture the desired vessel. As soon as the tip of the puncture needle 9 has entered the vessel, the puncture needle fills with blood that is collected in the blood collection container 10. This advantageously consists of a transparent plastic, so that a successful puncture can be recognized immediately. The elongated cutlery area is then pushed further into the vessel, at the same time widening it somewhat. After the cutlery has been pushed in far enough, the blood collection container is rotated by approx. 90 ° so that its locking is released. With the blood collection container 10, the needle tube 18 and the puncture needle 9 are simultaneously rotated by the same angle, which means that the housing tip 37 is unscrewed from the recess 38 on the puncture needle 9 and the puncture needle 9 is thus released. The container 10 is then pulled backwards until the stop 20 strikes a suitable counter bearing in the housing or at the end of the extension section 4 and it is no longer possible to pull it out. A renewed insertion is also not possible because the locking element 21 is spring-loaded and would strike the extension section when inserted. The puncture needle 9 contaminated with blood is thus completely encapsulated, thus eliminating the risk of injury to personnel. Any protective regulations are thus fulfilled in all respects by the puncture set according to the invention.

After the puncture needle has been drawn in sufficiently far, the cover 11 is pulled outward so that residual blood in the needle is drawn in. The hold-down device 30 is then pulled out of the clamping section 12, so that the catheter clamped over it is released. The catheter 8 is then pushed further into the jacket 7. Since the puncture needle or the needle tube is withdrawn beyond the branch area, the needle or the needle tube is no longer in the way, so that the catheter 8 is inserted into the elongated housing section and at the front end, which is still in the vessel, can leak. The catheter 8 is now inserted as far as is necessary, which can be easily understood from the length marking on the catheter. After positioning the catheter, the cutlery is pulled out of the patient. Subsequently, the clamping section 27 is pulled out of the clamping section 12 by means of the tab 29 and the entire jacket is also pulled out of the housing. The sheath is then separated from the catheter, which leaves the sheath through the longitudinal slot 31.

After the puncture, there are a total of two parts in addition to the catheter, namely the housing with the puncture needle and blood collection container and the jacket. Both can be disposed of easily and safely. Except for the puncture needle itself, which is made of metal, all elements can be made of plastic, the blood collection container preferably being made of transparent plastic. The sheath should be sufficiently flexible so that it can be pulled out of the housing with ease, but it must not present too great a resistance to the catheter to be inserted. Overall, the cutlery according to the invention allows a much easier puncture and a much easier insertion of a catheter than was previously the case using the known “Seldinger” method.

Finally, instead of a pre-assembled catheter, it is possible to insert a catheter into the housing only when necessary. Such a separate catheter is normally located in a tubular protective sheath, at the front end of which a sleeve is provided. If necessary, the protective cover is clamped with the hold-down device 30 even without a sleeve. For insertion of the catheter, the protective sheath is simply pushed over the clamping section. The catheter can then be inserted into the sheath from the protective sheath. In a cutlery version with a protective cover and at the end with a cover, the jacket does not have a clamp holder, since this would be a hindrance here.

Claims

claims

1. Catheter puncture set comprising:

- A tubular housing (2) with an elongated housing section (3) which merges into an extension section (4) and from which branches at an angle a branch section (5), the housing section (3) and the branch section (5) one have a continuous lateral opening (6),

- One extending along the branch section (5) and the housing section (3), the side opening (6) closing flexible

Jacket (7) into which a catheter (8) can be inserted,

- As well as with its tip emerging from the housing (2), along the elongated housing section (3) and the extension section (4) extending puncture needle (9), which after puncturing into the housing (2) to behind the branch point of the branch section

(5) can be drawn in and then the catheter (8) can be pushed out of the housing (2) via the branch section (5) and the housing section (3).

2. Catheter puncture set according to claim 1, characterized in that the puncture needle (9) opens into a blood collection container (10) which can be moved together with it.

3. Catheter puncture set according to claim 1 or 2, characterized in that the puncture needle (9) is received in a needle tube (18) which only releases the needle tip.

4. Catheter puncture set according to one of the preceding claims, characterized in that the puncture needle (9) can only be pulled out of the housing (2) up to a stop (20).

5. catheter puncture set according to one of the preceding claims, characterized in that a blocking element (21) for preventing a insertion of the withdrawn puncture needle (9) is provided.

6. catheter puncture set according to claim 4 or 5, characterized in that the stop (20) and / or the locking element (21) is formed by means of a projection formed on the needle tube, which or which abuts a corresponding counter bearing on the housing.

7. Catheter puncture set according to one of the preceding claims, characterized in that means are provided on the container side for sucking in residual blood located in the puncture needle (9).

8. catheter puncture set according to claim 7, characterized in that the means are in the form of a blood collecting container (10) closing flexible and curved lid (11) which is formed between one in the

Blood collection container (10) and an outwardly curved position is movable.

9. catheter puncture set according to one of claims 2 to 8, characterized in that in the interior of the blood collection container (10) connection means (19) for a syringe or the like. are provided.

10. Catheter puncture set according to one of the preceding claims, characterized in that locking means for locking the puncture needle (9) are provided in their puncture position against being drawn into the housing (2).

11. Catheter puncture set according to claim 10, characterized in that for locking on the extension section (4) a threaded attachment (14) is provided with which one on the blood collection container (10) is provided

Counter bearing (17) cooperates.

12. Catheter puncture set according to one of claims 2 to 11, characterized in that on the extension section (4) to the blood collecting container (10) sealing element (15) is provided.

13. Catheter puncture set according to one of the preceding claims, characterized in that the jacket (7) is tubular and slotted (31).

14. Catheter puncture set according to one of the preceding claims, characterized in that an opening (32) is provided on the jacket (7) in the region arranged in the branch area, through which the puncture needle (9), which may be guided in the needle tube (18), is inserted into the jacket (7) occurs.

15. Catheter puncture set according to one of the preceding claims, characterized in that arranged in the branch section (5)

A clamping section (27) is provided in the jacket region and is clamped in a clamping section (12) formed on the branch section (5).

16. Catheter puncture set according to one of the preceding claims, characterized in that a hold-down device (30) for releasably holding the clamp of an inserted catheter (8), possibly surrounded by a protective sheath, is provided on the jacket end located in the branch section (5).

17. Catheter puncture set according to claim 16, characterized in that the hold-down device (30) is connected via a tab (29).

18. Catheter puncture set according to one of claims 15 to 17, characterized in that the clamping section (27) and / or the hold-down device

(30) is formed by means of one or more radially projecting ribs (28).

19. Catheter puncture set according to one of the preceding claims, characterized in that a sealing element (33) sealing towards the inserted catheter (8) is provided at the end of the substantially tubular jacket (7) lying in the branch section (5).

20. Catheter puncture set according to one of the preceding claims, characterized in that the housing tip, the jacket tip and the needle tip form a substantially conical shape with one another in the puncture position.

21. Catheter puncture set according to claim 20, characterized in that a recess (38) is provided on the puncture needle (9) into which the front edge of the elongate housing section (3) engages essentially flush.

22. Catheter puncture set according to claim 20 or 21, characterized in that the jacket tip (34) is flexible and flap-like with a shape tapering towards the front.

23. Catheter puncture set according to claim 22, characterized in that the jacket tip (34) is articulated via a film hinge (35).

24. Catheter puncture set according to one of the preceding claims, characterized in that the jacket (7) and the housing (2) is designed to accommodate a single-lumen or a multi-lumen catheter (8).

25. Catheter puncture set according to one of the preceding claims, characterized in that a protective sleeve (12) which is pushed and releasably locked over the elongated housing section (3) is provided.

26. Catheter puncture set according to one of the preceding claims, characterized in that it consists of plastic with the exception of the puncture needle (9).

27. Catheter puncture set according to claim 26, characterized in that at least the blood collection container (10) consists of a transparent plastic.

28. Catheter puncture set according to one of the preceding claims, characterized in that it is pre-assembled with a catheter (8) inserted into the jacket (7) and possibly clamped by means of the hold-down device (30).