DE2028662A1 - Blocking cap for blood collection needles - Google Patents

Description

PATENT ADVOCATE DR. HANS-GUNTHER EGGERT, DIPLOMA CHEMIST

5KDLN-UNDENTHAl PETEK-KINTQSN-STBASSES

Cologne, June 9th, 1970 Rö / Cl / 159

Johnson & Johnson, 501 George Street, New Brunswick New Jersey, U.S.A.

Blocking cap for blood collection needles

The present invention relates to a blood withdrawal device with a cannula, which is on the one hand through a closure piece is guided into a vacuum container and the other end of which is to enter a blood vessel that is connected to a structurally and functionally improved shut-off cap is provided, which acts as a sealing cover for the closure piercing cannula is used before or after its passage through the closure of the vacuum container.

The needle covers proposed so far have certain ones Disadvantages which are eliminated by the shut-off cap according to the invention will. For example, U.S. Patent No. 2,847,995 a transfusion needle cover known whose open end is pulled over the needle bead to ensure a drip-proof attachment. This may be for a blood transfusion " Onsgerät may be sufficient, but it can happen that the removal of the cover from a repeatedly used blood collection device is desirable. It is impossible to remove the sheath once it is pulled over the needle bead. The needle covers that have been customary up to now would not be possible without a needle bead remain in their position on the needle. Also, they wouldn't prevent blood from dripping out of the envelope, though

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its open end is not secured by the needle bead were. This comes out very clearly. U.S. Patent 3,134,380 emerged.

The subject of the invention is a shut-off for a blood collection needle, which is only pulled slightly over the needle and is not attached or secured to the open end of the needle.

Furthermore, the subject of the invention is © in® Dicfctungsvor ~ direction the Absperrkapp®, whereby v®im ± ®a®n , the blood from the tip d © s? Needle runs on clothes or duvet covers.

The invention is explained in the following part of the expression shown in the figures ispi®l®2i »

Fig. 1 shows an aiifc © inoE »Kapp® ¥ © rs @ Si © nen and thus secured container fto © in® sterile double-sided open hollow © Had @ l oö © r Kaaül © salt'®in @ ni ¥ ulst _p the between the needle tips is attached _p uad di © erfindungsgsaiäße sterile shut-off, the äi® Maelelspitge _s. di © dea closure of a yakuumtoehüfcer diui? chdring @ n is supposed to be covered.

Pig. 2 shows the container of Pig »1 with the cap removed.

Fig. 3 is a perspective view showing assembly the needle and the shut-off valve with a holder, which accommodates the vacuum container shows.

Pig. 4 is a perspective view after assembly the one in Pig. 3 shown; Parts.

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Fig. 5 shows in perspective the tin penetration into the Vacuum container prepared needle, the shut-off valve and part of the holder with the needle holder removed to allow the other needle tip into a blood vessel can penetrate. Also is part of the vacuum container shown with its clasp to give an indication of the size ratio of the clasp to the holder.

6 is a section through the blood collection device, the needle has not yet entered the vacuum container but the other end is already in a blood vessel.

Fig. 7 shows enlarged in section parts of the needle, des The holder and the vacuum container, showing the compression and deformation of the shut-off valve, when the needle passes through the vacuum container in the holder will tochen.

Fig. 8 shows in section the needle and the holder, wherein the shut-off valve due to its elasticity the needle point covered again, and the drop of blood that forms at the point in the closed end of the shut-off valve, at which the puncture closes again.

Figure 9 is a perspective view of the stop valve with the blood drop.

10-13 are preferred embodiments of the invention Shut-off valve shown.

A shut-off cap 1 for taking blood ^ bypasses a hollow cylindrical part 2 made of flexible, elastic material and has a closed flat one

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flat end 3 and an open end 4. Within the bore of part 2 are inwardly directed raised annular shapes Seals 5 are provided, which are located in the vicinity of the area that covers the needle tip 6. The seals 5 are in sliding contact with the outer surface 7 of the needle 8 and form one Series of seals that prevent blood from leaking out of the closed end part 9 of part 2. Of the Part 2 is so long that the needle 8 is covered from the point β to the bead or hub 10 »The bead 10 is attached to the needle, but part 2 is not connected to the bead 10 or pushed over it »

The shut-off cap 1 can be used together with various types of beads, for example is use a bead provided with a thread or acting by frictional engagement as well as the use of needles possible, which is attached to the bottom of the holder 11 but somewhat inconvenient for attaching and removing the shut-off cap are.

Holders and vacuum containers can be in the usual form be used, a clear plastic holder 11 with a threaded hole 12 on the front part 13 of the holder 11 and a vacuum container 14 are preferred, which is made of a glass vial or tube 15 and a pierceable, self-closing closure 16 is made. A blood preservative or other liquid or solid Reagents such as anticoagulants or heparin that are used for Subsequent tests may be useful in the container before the loosely closed vial is brought into an appropriate chamber for evacuation. The vacuum created in the vial will

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after letting air into the evacuation chamber of the Lock on the bottle in its closed position pressed.

With this blood collection device can a certain Several blood samples are taken from the patient, the needle remaining in the blood vessel 17. Here are sequential Vacuum container 15 in the holder 11. brought first, the closed end 3 of the flexible Part 2 and then the lock 16 with the tip of the needle 6 is pierced and the needle tip 6 penetrates into the interior 18 of the vacuum container 14, whereupon Blood from the blood vessel 17 into the vacuum container 14 the needle 8 flows. The shut-off cap is located here 1 in a compressed position 19, after removing the vacuum container 14 from the needle 8, the The shut-off cap 1 is returned to its original position (see Pig. 8), again covering the needle tip 6. A drop of blood 20 now appears at point 21 of the leather-sealed needle penetration Droplet 20 appears every time a vacuum container 14 is removed from the holder 11. The blood drop 20 is used as an indication that there is actually a puncture in a Blood vessel was made. If no drop appears and the vacuum container does not fill with blood, the venipuncture was unsuccessful. If, on the other hand, the Blood drop 20 appears, but vacuum container 14 remains bloodless, this is an indication that the vacuum in the vacuum container 14 has not been sufficient. In in this case the container 14 should be removed and put through to be replaced by another. Although it is less likely, the absence of the drop may of course 20 and the blood in the vacuum container are both unsuccessful Venipuncture as well as the loss of vacuum in the vacuum container.

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It has been found that the shut-off cap 1 at six or more blood samples works satisfactorily with the corresponding number of vacuum containers. After the last blood sample is taken the shut-off cap 1 can be removed from the needle 8 with the aid of the needle container 22, wherein the cap 23 like a wrench to the end of the The needle 8 protruding from the holder 11 and the bead 10 rotated counterclockwise around the needle thread 24 unscrew and then the needle 8 from the holder 11 separate. The shut-off cap 1 can be removed by hand, after which the needle 8 is inserted again into the holder 11 and the bead 10 is screwed into the holder. The blood residue in the needle 8 can still be used for microscopic Investigations used and carried out on a microscope slide Bubbles are applied into the opening 25 of the holder 11.

There are other occasions when the use of the shut-off cap 1 is undesirable. Then the cap 1 can immediately can be removed from the needle 8 when the cap 23 is removed from the needle container 22 * When the needle 8 and the shut-off cap 1 are already in the holder 11,

may be a pair of tweezers or other suitable instrument ^ used to remove cap 1. While ™ the training of younger staff, it is desirable that this exercise gets a suitable venipuncture perform. In addition, it can sometimes be very difficult for experienced staff to find a clean Perform venipuncture. In these cases it is of great help if the shut-off cap is removed beforehand can be.

The preferred embodiment of the locking cap 1 is in 10 shown. Other embodiments are shown in FIGS Figures 11-13 are shown. The tube 26 in Fig. 11 is designed similarly to the embodiment in Fig. 10, but

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however, sits a round, closed end. The same applies to the embodiment 27 of Fig..12, which however additionally has a conical open end 28 which partially everts over the bead 10, but with this one is not connected. The three annular seals 29 have in contrast to the seals of 10 and 11, which represent semicircular beads in section, in section the shape of narrow triangular points which are in contact with the needle surface 6. The cap JO from Fig. IJ has a narrowed inner diameter, so that the cap with the inner surface 31 on the Needle tip 6 is applied. At the open end 33, this cap 30 widens into a part with a conical inner Expansion 32 · The embodiments 27 and 30 can just like the cap 1 from FIG. 10, a flat, closed one Own end. In none of the embodiments, there is a seal between the open end of the Cap and the bead 10. Instead of the seals 5 or 29 one or more than two can be used, but it is not practical to use too many seals use, as this affects the compression and especially the return to the original shape of the cap would.

The material used for the sealing cap can of course Rubber, rubber compounds or rubber-like synthetic elastomers that support compression and Have restorative properties of rubber when they are in of the form described here. The closed end of the shut-off cap can be coated with a liquid silicone how Dow-Corning 360 Medical Fluid are coated to prevent the closed end 3 of the cap 1 from sticking on the closure of the vacuum container 14 to prevent.

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Instead of or in addition to the use of silicone or other lubricant on the outer surface of the closed, flat end 3, this can also be provided, for example, with knobs to open this way the cap 1 adheres to the vacuum container closure 16 through a minimal contact area. The wall thickness of the flexible part 2 is in particular about 1 mm and is preferably in a range from 0.75 to 1.25 mm. A total area from 0.5 to 1.75 depending on the given Circumstances are used. At this wall thickness, there will be sufficient rebound or rebound of the flexible part 2 guaranteed in its original shape. Other factors that are taken into account must and which influence each other as well as the wall thickness are the composition of the rubber or elastomers, their hardness, the presence or absence of a lubricant on the Needle 8 or on or in the rubber or elastomer, the presence or absence of waterproofing 5 »29 and the seat of the needle tip 6 in the cap. A relatively soft, porous rubber material may be used require a greater wall thickness, if a hard one will on the other hand, you can get by with thinner walls. The aim is to create a balance between these factors, which ensures a return of the cap 1 to its original position (Fig. 8), again releasing the needle 8 covers and seals. These conditions are particularly prevalent in rubber or in rubber compounds containing wax Fulfills. It is important that the seals 5 represent a liquid seal and the Hold the cap 1 on the needle 8, but the return of the cap 1 to its original position on the needle 8 allow. The needles 8 are preferably with a

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liquid silicone solution rubbed off with the help of cotton. This will provide sufficient lubrication and an easy return of the cap 1 to its original shape is achieved.

In addition to the previously described type of use the sealing cap according to the invention can also be used for others Needles can be used in the same way. For example, the cap 1 can be placed on a subdermal needle attached to a syringe and for intravenous or intramuscular injections in the same patient for consecutive or repeated doses of medication from a simple syringe, for example for anesthesia or cardiac stimulation. The shut-off device jumps between such cans. cap and seal the needle until the next dose is administered. One use of the shut-off cap offers itself in a number of other corresponding medical applications. The subject matter of the invention is not limited to that shown in the figures Embodiments limited.

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Claims (4)

Claims A shut-off cap that easily returns to its original shape for the end facing away from the puncture side a hollow needle for blood collection and injection purposes with a bead and a piercing end by a flexible, elastic, hollow cylindrical part (2, 26, 27 or 30) of slightly larger size Length as the distance from the needle bead (10) to the needle tip (6) and a closed pierceable End (3) and a seal (5, 29, 31) inside the hollow part (2, 26, 27, 30). 2. shut-off cap according to claim 1, characterized in that that the seal consists of an elongated constriction (31). 3. shut-off cap according to claim 1, characterized in that that the seal consists of at least one bead-like constriction (5, 29). 4. shut-off cap according to claim 1 to 3, characterized in that that its closed end is rounded and / or provided with knobs. 009832/1437 Blank page