DE102008060882A1 - Puncture set for inserting intravenous input into blood vessel of patient, has spring expanded during extraction of puncture needle from channel, and needle guard element reversibly positioned before needle point - Google Patents

Abstract

The set has a slipping controlled needle guard element (31) provided on a puncture needle (2), where the guard element covers a needle point (210) extracted on the puncture needle. A screwed spring (3) is arranged in a region of proximal end (20) of the puncture needle, where the spring is guided by the puncture needle. The spring is compressed by proximal end (10) of a channel (1) during connection of the puncture needle with the channel, where the spring is expanded during extraction of the puncture needle from the channel. The guard element is reversibly positioned before the point.

Description

The The invention relates to a puncture kit comprising a cannula with a proximal and a distal end and one from the proximal one to the distal end continuous lumen and one from the proximal end of the cannula through the Lumen-extending puncture needle with a proximal end and a distal end with a needle tip extending from the distal end of the Cannula protrudes, with the cannula and the puncture needle detachably connectable to one another in the region of their proximal ends and the puncture needle after disconnecting the proximal end of the cannula is pulled out, wherein on the puncture needle a sliding guided needle protection element is provided, which in pulled out of the cannula Puncture needle covers the needle tip.

Puncture sets The type mentioned above are known and are for example used for laying an intravenous access in which the through the cannula extending puncture needle with her from the distal end of the cannula protruding distal end stabbed in a patient's blood vessel and here the arranged on the puncture needle cannula nachgeschoben in the blood vessel and thus placed becomes. Subsequently, the puncture needle via the proximal End of the cannula from the blood vessel and the cannula are pulled out, leaving only the cannula remains within the blood vessel and subsequently as access z. B. for a syringe or infusion tube serves.

In In recent years there has been an increased need for puncture sets come of the type mentioned above, the on a reliable needle guard, such that possibly automatically a protective element over the used, d. H. from the blood vessel of the Patients withdrawn puncture needle is placed around an accidental Prevent piercing with this used needle. In this way insbesonde re the medical staff, which the puncture set used, for example, protected against hepatitis or HIV infections become.

The state of the art, for example, on the WO98 / 57689 as well as the WO2007 / 142746 A1 directed.

adversely in the known solutions it is that these mechanically are very expensive, some have large footprint and in particular in the case of the emergency occurring in emergency medicine Working the workflows for laying a example obstruct intravenous access.

From the US-B-6,623,458 Further, an injection needle for a syringe is known, which has a needle-guided on the needle needle protection. The needle guard is moved by means of a pre-compressed spring in its protective position as soon as a connected syringe is completely emptied and triggers the drive by means of the spring. However, this known embodiment is not suitable for a Punktionsset, but requires a triggering by a syringe plunger.

task The invention is therefore a Punktionsset the aforementioned To propose way, which overcomes the disadvantages of the prior art.

to Solution of the problem is inventively the Formation of a puncture set with the features of claim 1 proposed.

advantageous Embodiments and developments of the invention are the subject the dependent claims.

Of the proposal according to the invention provides, in the area of the proximal end of the puncture needle one on the puncture needle Guided spring to arrange when connecting the puncture needle is compressed with the cannula from the proximal end thereof and when pulling out the puncture needle from the cannula is relaxed. At the end of the spring adjacent the needle tip is the needle guide slidably guided on the cannula provided, which when pulling out the puncture needle from the Cannula from the thereby relaxing spring irreversible is pushed in front of the needle tip.

By this embodiment of the invention is a Puncture set created, which is in the known manner z. B. for laying an intravenous access, wherein between the proximal ends of the interconnected cannula and puncture needle provided compressed and thus biased Spring fulfills a double function.

On the one hand causes the biased spring after laying the patient access and the release of the releasable connection between cannula and puncture needle due to the onset of spring relaxation pushing out the puncture needle on the proximal end of the cannula and pushes the other in the opposite direction, the guided on the cannula needle protection element Direction to the distal end of the cannula with the needle tip provided there. When the puncture needle is fully withdrawn from the cannula, the relaxing spring pushes the needle shield over the tip of the needle, so that the needle protection element irreversibly covers the needle tip and protects against accidental puncture with this used puncture needle.

For this no additional action of the user is required so that the needle guard is automatically and forcibly effected and the user does not need to be trained separately.

Of the Users of the Punktionssets invention needs after the puncture of the desired blood vessel only the temporary connection between puncture needle and cannula, whereupon the compressed spring automatically the puncture needle from the proximal end pushing out the cannula and for the correct one Positioning the needle guard in front of the needle tip. The Handling of the puncture set according to the invention It is also used in stress situations, as in emergency medicine can happen, greatly simplified and safety elevated.

To a proposal of the invention can as a needle protection element on the puncture needle slidably guided sleeve provided which is ver affiliated with the end of the spring and inwändig has a stop projection for the needle tip, which irreversibly lays in front of the needle tip and moves backwards sleeve towards the proximal end of the puncture needle prevented by stop the needle tip on the stop projection.

The Design of the stop projection is not subject to a general structural limitations, as long as it is ensured that the sleeve sliding on the puncture needle such it is stated that the compressed spring is the sleeve towards the distal end of the puncture needle is able to move and after reaching the needle tip a reliable irreversible Locking of the needle protection element takes place in front of the needle tip.

To a proposal of the invention can this purpose the stop projection resiliently swung out of the inner wall of the sleeve be as soon as the needle protection element in front of the needle tip to lie comes or but the stop lug is from one in the wall formed sleeve resiliently mounted ball or tab, when reaching the needle tip from the inner wall of the sleeve emerges and serves as a stop for the needle tip.

To Another suggestion may also be an elastically compressed sealing cord be provided as a stop projection, which inwändig on the Sleeve is attached and from the puncture needle, on the the sleeve is guided, as long as restrained, until the needle guard from the spring over the needle tip is advanced.

Further may be provided, facing at the distal end of the puncture needle End of the spring or at the corresponding end of the sliding on the Puncture needle guided sleeve one transverse to the longitudinal axis the puncture needle extending disc to provide over an eccentrically arranged passage opening for the puncture needle. By the off-center Arrangement of the passage opening experiences the puncture needle not yet over the distal end of the puncture needle advanced needle protection element a slight curvature and jumps in the moment in which the disc over the needle tip is pushed out, back to its rest position, in which the needle tip is no longer with the off-center arranged through passage bore is aligned, so that a stop for the Needle tip is formed by the disc, which acts as a needle protection element can serve in the sense of the invention.

Also, a needle protection element of a bent spring plate, z. B. according to the US-B-6,623,458 can be used.

According to a further proposal of the invention, a shielding element for the puncturing needle is provided between the needle protection element and the proximal end of the puncture needle, consisting of at least two parts connected to one another via a joint. Such shielding z. B. from the WO 02/072 181 A2 known. In a rest position, the parts of the shielding are erected transversely with respect to the needle axis and release the puncture needle, while they are aligned in a protective position at least approximately parallel to each other and irreversibly cover the puncture needle in a so-called protective position. The movement between rest and protection position has hitherto been done by a manual operation of the shielding. In the context of the invention, the transfer of the parts of the shielding in the protective position automatically and automatically, since the arranged between the needle guard and the proximal end of the puncture needle compressed spring forces the parts of the shield when pulling out the puncture needle from the cannula in its protective position, without it requires an additional handle. The safety and ease of use is thus significantly increased.

For releasable connection of the proximal ends of cannula and puncture needle, for example, a bayonet closure may be provided, so that a slight relative rotation of the two proximal ends of cannula and puncture needle is sufficient to break the connection between them and a relaxation of kompri initiated spring.

The Spring itself can be in the area of the proximal end of the puncture needle be attached, for example, be glued.

The Spring is according to a proposal of the invention as a coil spring trained, there is also a training as a spiral spring with minor Diameter change of each successive Turns.

In relaxed state, the spring should be at least 2 mm longer as the puncture needle to the needle guard reliably in front of the needle tip at the distal end of the puncture needle to be able to.

It is understood that the Punktionsset invention depending on the application, also formed with other features can be provided, for example, can be provided within the cannula to arrange a check valve to after removing the Puncture needle an undesirable reflux of Blood through the cannula and an uncontrolled escape over to prevent the proximal end thereof.

Further Embodiments and details of the invention are described below Based on the various embodiments illustrative drawing explained in more detail. Show it:

1 In a schematic plan view of a Punktionsset according to the invention in ready to use arrangement;

2 The puncture set according to 1 after releasing the connection between cannula and puncture needle;

3 The puncture needle of the puncture set completely withdrawn from the cannula according to 1 ;

4 The distal end of the puncture needle according to 3 in greatly enlarged representation;

5 An alternative embodiment of a needle protection element of the puncture set according to the invention;

6 - 9 Another embodiment of the invention.

From the 1 is a puncture set consisting of one with wings, for example 14 provided cannula 1 and a puncture needle 2 as can be used, for example, for laying an intravenous access.

The cannula 1 includes one at the proximal end 10 provided body 13 on which also the wings 14 are formed as well as one towards the distal end 11 extending through cannula wall which extends from the distal end to the proximal end 10 continuous lumen 12 surrounds. Starting from the proximal end 10 the cannula 1 is towards the distal end 11 a puncture needle 2 in the continuous lumen 12 inserted, in such a way that the distal end 21 the puncture needle 2 which also has a sharpened needle point 210 carries, from the distal end 11 the cannula 1 protrudes.

In the area of the proximal end 20 the puncture needle 2 is a corpus 22 with a cylindrical approach 220 molded, which carries a bayonet outer thread, with a corresponding internal thread in a receiving bore 15 the cannula 1 cooperates in such a way that the puncture needle 2 with the cannula 1 is detachably connectable. About a connection part 24 For example, a syringe or the like. To the puncture needle 2 in the area of the body 22 be connected to the same. Further, on the puncture needle 2 a needle protection element 31 in the form of one of the 4 on an enlarged scale recognizable sleeve 310 provided, sliding on the puncture needle 2 is guided, but in the application state shown in accordance with 1 on the housing 13 the cannula 1 within the mounting hole 15 comes to the plant. Between the needle protection element 31 and the proximal end 22 the puncture needle 2 is also a coil spring 3 provided, also on the puncture needle 2 is guided and in the position shown in accordance with 1 in which the puncture needle 2 with the cannula 1 is connected, from the housing 13 at the proximal end 10 the cannula 1 over the needle protection element 31 a maximum compression experiences.

In other words, the coil spring 3 between the proximal ends 10 . 20 from cannula 1 and puncture needle 2 with the interposition of the needle protection element 31 placed on the puncture needle and biased by the compression.

In this from the 1 As can be seen, intravenous access can be provided by means of the protruding distal end 21 the puncture needle 2 a desired blood vessel is pierced and the puncture needle 2 together with the following cannula 1 is advanced into the blood vessel.

Below is the cannula 1 with the addition of the wings 14 fixed in position and then the connection between the puncture needle 2 and the cannula 1 in which the bayonet catch in the area of the receiving bore 15 by a rotation of the puncture needle 2 is solved around its own axis.

As a result of loosening the connection between the cannula 1 and the puncture needle 2 causes the spring force between the proximal ends 10 . 20 from cannula 1 and puncture needle 2 located and preloaded compressed spring 3 a retraction movement in the lumen 12 the cannula 1 guided puncture needle 2 according to arrow A in 2 so that the puncture needle 2 from the proximal end 10 the cannula 1 with progressive relaxation of the spring 3 slides out. This can be done by appropriate dimensioning of the spring 3 and the degree of compression thereof in the position according to 1 the spring force can be adjusted so that either an automatic ejection of the puncture needle 2 from the cannula 1 done or the spring 3 the still manually made extract of the puncture needle 2 from the cannula 1 only supported.

Of the 2 Moreover, it can be seen that the spring, which is gradually relaxing, nevertheless still exerts spring force 3 next to the movement of the puncture needle 2 in the direction of arrow A also a feed of the needle protection element 31 in the opposite direction B to the needle tip 210 at the distal end 21 the puncture needle 2 causes, in which they the needle protection element 31 still in the receiving hole 15 in the case 13 the cannula 1 pressed.

The relaxation of the spring 3 automatically engages as soon as the connection between cannula 1 and puncture needle 2 will be annulled. Accordingly, the feed of the needle protection element sits 31 automatically.

Finally, the movement is the functional needle 2 in the direction of arrow A so far advanced that it is completely out of the proximal end 10 the cannula 1 emerges and thus exists as a single part, leaving only the cannula 1 remains in the blood vessel and can serve as access.

In this, in the 3 The state shown pushes the spring 3 , which now relaxes completely, the needle protection element 31 over the distal end 21 and the needle tip provided there 210 in the direction of arrow B, as the spring 3 in relaxed condition at least 2 mm longer than the puncture needle 2 is executed. In this from the 4 closer apparent position occurs within the as a needle protection element 31 serving sleeve 310 provided stop projection 311 in action, which, for example, spring-loaded from the wall of the sleeve 310 pops out as soon as the sleeve 310 over the needle point 210 out from the spring 3 has been advanced. The stop tab 311 subsequently prevents any return movement as a needle protection element 31 serving sleeve 310 from her in the 4 shown position back toward the proximal end 20 the puncture needle 2 so that the needle tip 210 irreversible from the needle protection element 31 is surrounded and thus a protection against accidental puncture with this used puncture needle 2 is guaranteed. So that the spring 3 and the needle protection element 31 Captive on the puncture needle 2 are held, it is suggested that the proximal end 20 the puncture needle 2 adjacent end of the spring 3 in the sleeve running there 220 Permanently secure, for example, stick and on the other hand as a needle protection element 31 Serving sleeve 310 permanently with the distal end 21 the puncture needle 2 adjacent end 30 to connect the spring, for example, to glue both parts together.

Instead of a stop projection 311 inside the as needle protection element 31 serving sleeve 310 can according to 5 also one at the front, ie over the needle point 210 reaching out end of the sleeve 310 provided disk 312 serve, which has an off-center passage hole 313 for the puncture needle 2 having. It is understood that the illustration according to 5 not to scale to the 4 is because in this case the sleeve 310 must have a larger diameter. The puncture needle is in their out of the 1 and 2 apparent positions, in which the needle protection element 31 on the puncture needle 2 is guided, through the passage bore 313 guided, leaving a slight bend of the puncture needle 2 is effected. However, as soon as the front end of the sleeve 310 arranged disc 312 over the needle point 210 out from the spring 3 is advanced, the puncture needle jumps 2 due to the then lack of leadership within the through hole 313 in their relaxed position inside the sleeve 310 back and on a further retraction of the sleeve 310 towards the proximal end 20 the puncture needle 2 would the needlepoint 210 at the with 314 marked area of the disk 312 strike, so that a further return movement of the needle protection element 31 is prevented.

It is also possible the disc 312 without a sleeve 310 immediately at the end 30 the feather 3 as a needle protection element.

Also in this embodiment is thus a reliable and automatically by means of relaxing spring 3 caused Nadelschutz. Essential advantage of sliding on the puncture needle 2 guided by the spring sleeve 310 as a needle protection element 31 is it that this needle protection element 31 sliding and thus without jerking on the Puncture needle 2 is guided and in the intended for use position of the puncture set according to 1 under bias against the proximal end 10 the cannula 1 is pressed. When pulling out the puncture needle 2 After laid access, the needle protection element automatically moves continuously over the circumference of the puncture needle 2 without having to overcome any resistance to the cannula 1 could transmit and here, for example, to a positional displacement of the cannula 1 or even accidental slipping out of the cannula 1 can lead from the blood vessel.

Another embodiment is analogous to the steps in the 1 to 3 from the corresponding ones 6 to 8th can be seen, wherein like parts have the same reference numerals and will not be explained again to avoid repetition, unless this is necessary for understanding.

In contrast to the embodiment according to 1 to 3 shows the embodiment according to 6 to 8th an additional shielding element, which consists of the parts 4a . 4b consists. The two parts 4a . 4b are about a joint 40 , z. As a film hinge hinged pivotally connected to each other and the distal part 4a is with his the joint 40 opposite end via another joint hinge 42 pivotable on the as a needle protection element 31 attached sleeve while the part 4b via a joint hinge 41 at the beginning 220 of the proximal end 22 the puncture needle 2 is pivotally mounted.

As in the embodiment according to 1 to 3 is the spring 3 on the puncture needle 2 in the starting position according to 6 between the needle protection element 31 and the approach 220 of the proximal end 22 the puncture needle 2 biased by compression when the puncture needle 2 into the cannula 1 is plugged in. In this position are the parts 4a . 4b the shielding in a rest position, in which they transversely to the axis of the puncture needle 2 run and unfolded release the puncture needle.

After loosening the connection between puncture needle 2 and cannula 1 according to 7 initiates the relaxing spring 3 while pulling out the puncture needle 2 from the cannula 1 the gradual transfer of parts 4a . 4b the shielding in their the puncture needle 2 Covering protective position according to 8th in the end, a complete coverage 400 the puncture needle 2 through the parts 4a . 4b is effected.

There, how out 9 visible, the parts 4a . 4b have a reverse U-shaped cross-section, overlap the puncture needle 2 with maximum protection.

It can also be provided latching means to latch at least one part 4a . 4b with the puncture needle 2 in the out 8th cause apparent protection position.

In this embodiment, the needle protection element 31 serving sleeve preferably a z. B. off 5 apparent disc 312 with eccentrically arranged through-hole 313 for the puncture needle 2 on.

The decisive factor is the transfer of the parts 4a . 4b from the rest position according to 6 in the protective position according to 8th by means of the spring 3 is automatically effected as soon as the connection between cannula 1 and puncture needle 2 lifted and the puncture needle 2 from the cannula 1 is pulled out.

The Handling and application security of the above explained Puncture sets is therefore particularly effective.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 98/57689 [0004]
• WO 2007/142746 A1 [0004]
• - US 6623458 B [0006]
• - US 623458 [0020]
• WO 02/072181 A2 [0021]

Claims (11)

Puncture kit comprising a cannula ( 1 ) having a proximal and a distal end ( 10 . 11 ) and a lumen extending continuously from the proximal to the distal end (US Pat. 12 ) and one from the proximal end ( 11 ) of the cannula ( 1 ) through the lumen ( 12 ) puncture needle ( 2 ) with a proximal end ( 20 ) and a distal end ( 21 ) with a needle point ( 210 ) coming from the distal end ( 11 ) of the cannula ( 1 protruding), wherein the cannula ( 1 ) and the puncture needle ( 2 ) in the region of their proximal ends ( 10 . 20 ) are releasably connectable to each other and the puncture needle ( 2 ) after releasing the connection from the proximal end ( 10 ) of the cannula ( 1 ), wherein on the puncture needle ( 2 ) a sliding guided needle protection element ( 31 ) is provided, which in needle withdrawn from the needle puncture needle ( 210 ), characterized in that in the region of the proximal end ( 20 ) of the puncture needle ( 2 ) one on the puncture needle ( 2 ) guided spring ( 3 ), which, when connecting the puncture needle ( 2 ) with the cannula ( 1 ) from its proximal end ( 10 ) and when pulling out the puncture needle ( 2 ) relaxed from the cannula while the needle protection element ( 31 ) irreversibly to the point of the needle ( 210 ) pushes. Puncture kit according to claim 1, characterized in that as needle protection element ( 31 ) one on the puncture needle ( 2 ) sliding guided sleeve ( 310 ) provided with the end ( 30 ) the feather ( 3 ) and inevitably a stop projection ( 311 ) for the needle tip ( 210 ) Puncture kit according to claim 2, characterized in that the abutment projection of a in the wall of the sleeve ( 310 ) is formed resiliently mounted ball or tab. Puncture kit according to claim 2, characterized in that the stop projection ( 311 ) is formed by an elastically compressed sealing cord, which inwändig on the sleeve ( 310 ) is attached. Puncture kit according to claim 1 or 2, characterized in that as needle protection element ( 31 ) one at the end ( 30 ) the feather ( 3 ) attached disc ( 312 ) with an off-center through hole ( 313 ) for the cannulas ( 1 ) is provided. Puncture kit according to one of claims 1 to 5, characterized in that between the needle protection element ( 31 ) and the proximal end ( 22 ) of the puncture needle ( 2 ) one of at least two via a joint ( 40 ) interconnected parts ( 4a . 4b ) existing shielding element for the puncture needle ( 2 ) is provided which, when pulling out the puncture needle ( 2 ) from the cannula ( 1 ) by means of the spring ( 3 ) from a rest position into a puncture needle ( 2 ) overlapping protective position is movable. Puncture set according to one of claims 1 to 6, characterized in that the proximal ends ( 10 . 20 ) of the cannula ( 1 ) and the puncture needle ( 2 ) are releasably connected to each other by means of a bayonet closure. Puncture kit according to one of claims 1 to 7, characterized in that the spring ( 3 ) in the region of the proximal end ( 20 ) of the puncture needle ( 2 ) is attached. Puncture kit according to one of claims 1 to 8, characterized in that the spring ( 3 ) is designed as a helical spring. Puncture kit according to one of claims 1 to 9, characterized in that the spring ( 3 ) in a relaxed state at least 2 mm longer than the puncture needle ( 2 ). Puncture set according to one of claims 1 to 10, characterized in that after release of the connection between the cannula ( 1 ) and the puncture needle ( 2 ) the puncture needle ( 2 ) by means of the spring ( 3 ) from the lumen ( 12 ) of the cannula ( 1 ) is pushed out.