DE2028662C3 - Blood collection needle - Google Patents

Description

The invention relates to a blood collection adcl according to the preamble of the patent claim.

From US-PS 28 47 995 a transfusion needle is known, which with a point of view and with a Provided piercing end and furthermore in the area of its piercing end with a cap to keep it sterile is surrounded. The cap is provided with withered rings on its inside so that it is easy to use Piercing the skin preceded by piercing the cap can be pushed back. the The cap is pulled over a shoulder through which the needle is stretched and is thereby fastened. This cap, which only surrounds the puncture end of the needle for Stcrilhallen, is difficult of the Remove needle. There is always the need to have the one inserted and with the cap to deliver protected needle together with a corresponding part of the device that has the hub. Apart from this, it cannot be avoided that, for example, blood from the tip of the Needle runs on clothes or duvet covers.

The object of the invention is to create a needle according to the preamble of claim that is sterile is held and as such can be used in a bleeding device and prevents blood from flowing out of the The tip of the needle drips.

This object is achieved according to the characterizing part of the patent claim.

Apart from the fact that in this way the needle is kept sterile and, as such, in a blood collection device can be used while preventing blood from dripping off the tip of the needle Cap at the piercing end of the needle can be easily removed and also serves as an indicator for a successful blood draw.

The seal can consist of an elongate or at least one bulge-like constriction.

The closed end of the cap can be rounded and / or provided with knobs.

The invention is explained below with reference to the exemplary embodiments shown in the figures. Fig. 1 shows a capped and so secured container for a sterile double-sided open blood collection needle.

F i g. Figure 2 shows the container of Figure 2. 1 with the cap removed.

ίο Fig. 3 is a perspective view showing the Assembling the needle and a ßlutentnahmevorrichlung shows.

Fig.4 is a perspective view according to the Assembling the in F i g. 3 illustrated parts.

F; G. 5 shows in perspective that for insertion into one The needle prepared in the vacuum container of the blood collection device.

F i g. 6 is a section through the bleeding device; where the needle is not yet in the vacuum container

2n has penetrated, but the other end is already in a blood vessel.

Fig. 7 shows enlarged in section parts of the needle when the vacuum container pierced by the needle will.

2) F i g. 8 shows in section the needle after removing the Vacuum beater,

F i g. 9 is a perspective view of the cap of the needle with a drop of blood;

10-13 are preferred embodiments

Ji) the cap of the needle.

A cap 1 for a blood collection adcl 8 consists of a hollow cylindrical part 2 made of flexible, elastic material and has a closed flat end 3 and an open end 4. Inside the

r> bores of part 2 are raised inwardly annular seals 5 are provided, which are located in the vicinity of the area which a piercing end 6 of the Needle covered. The seals 5 are in sliding contact with the outer surface 7 of the Needle 8 and form a series of seals that prevent blood from escaping from the closed end part 9 of part 2 prevent. The part 2 is so long that the needle 8 extends from the piercing end 6 to the flange 10 is covered. The flange 10 is on the needle 8

Γ), but part 2 is not with flange 10 connected or pushed over it.

The cap 1 can be used in conjunction with various types of flanges 10, for example is the use of a threaded one

■> »or by frictionally acting flange as well as the Use of needles that are attached to the bottom of a holder 11 is possible, but somewhat inconvenient for that Attaching and removing the cap 1 are.

Holder II and vacuum container 14 can be in the

Vi usual form can be used, with a clear one Plaslikhalter 11 with a threaded hole 12 on the front Part 13 of the Haller 11 and a vacuum container 14 are preferred, which consists of a glass vial or Tube 15 and a pierceable, self-closing

W) closure 16 consists. A blood preservative or other liquid or solid reagents such as anticoagulants or heparin required for subsequent Tests that are useful can be located in the vacuum container 14 before the loosely sealed vial • i> is brought into an appropriate chamber for evacuation. By the one produced in the vial Vacuum after air has been let into the evacuation chamber, the closure on the bottle

Chen pressed into its closed position.

With this blood collection device you can Several blood samples are taken from certain patients, with the needle remaining in the blood vessel 17. Vukuum containers are successively filled for 15 s introduced into the holder 11, first the closed end 3 of the flexible part 2 and then the Closure 16 is pierced with the piercing end 6 and the piercing end 6 into the interior 18 of the Vacuum container 14 penetrates, whereupon blood from the blood vessel 17 into the vacuum container 14 through the needle 8 flows. Here, the cap 1 is in a compressed position 19. After removing the Vacuum container 14 from the needle 8, the cap 1 returns to its original position (see Fig. 8), covering the piercing end 6 again. At the point 21 of the resealed needle puncture A drop of blood now appears 20. This drop 20 appears every time a vacuum container 14 is off the holder 11 is removed. The blood drop 20 serves as an indicator that a puncture has actually occurred Blood vessel was made. If no drop appears and the vacuum container 14 is not filled with blood is filled, the venipuncture was unsuccessful. If, on the other hand, the blood drop 20 appears, the If the vacuum container 14 remains bloodless, this is an indication that the vacuum in the vacuum container 14 was not enough. In this case the vacuum container 14 should be removed and replaced with another be replaced. Of course, although less likely, the absence of the drop 20 and the bitite may be in the vacuum container 14 both the unsuccessful venipuncture and the loss of the vacuum in the Show vacuum container 14.

The cap 1 can be satisfactory for six or more blood samples with a corresponding number of vacuum containers 14 work. After the last blood sample has been taken, the cap 1 can be removed from the needle 8 mil aid of a needle container 22, with a cap 23 like a wrench at the end of the Needle 8, which is provided from the holder 11. and the flange 10 is rotated counterclockwise to unscrew the needle thread 24 and then the needle 8 from Separate holder 11. The cap 1 can be removed by hand, after which the needle 8 is back in the Holder 11 inserted and the flange 10 in the holder 11 is screwed in. The ßlutrcsl in the needle 8 can then be used for microscopic examinations and applied to a slide by blowing into the opening 25 of the holder 11.

There are other occasions when the use of the cap I is undesirable. Then the Cap 1 can be removed from the needle 8 immediately when the cap 23 is removed from the needle container 22. If the needle 8 and the cap 1 are already in the holder 11, a tweezer or another can suitable instrument can be used to remove the cap 1. During the training of It is desirable for younger staff that they get practice in ignoring venous puncture 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 cap 1 has been removed beforehand can be removed.

The preferred embodiment of the cap 1 is shown in FIG. 10 shown. Other embodiments are shown in FIGS Figs. 11-13 are shown. The embodiment 26 in FIG. 11 is similar to the embodiment in FIG. 10 formed, but has a round, closed End. The same applies to the embodiment 27 of FIG. 12, which, however, additionally has a conical open Has end 28, which is partially turned over the flange i0, but is not connected to it. The three ring-shaped seals 29 have in contrast / u the seals of FIGS. 10 and 11, which in section represent semicircular bulges, in section the shape of narrow triangular points, which with the needle surface stay in contact. The tubular section 30 of FIG. 13 has a narrowed inner diameter, so that the inner surface 31 of the cap rests against the needle tip 6. Expanded at the open end 33 the tubular section 30 is in a part with a conical inner bulge 32. The execution Shapes 27 and 30, like the cap 1 from FIG. 10, can have a flat, closed end. at neither of the embodiments is a seal between the open end of the cap and the Flange 10. Instead of the seals 5 or 29, one or more than two can be used, but is it is not advisable to use too many seals, as this is the compression and especially the return to the original shape of the cap would affect.

The material used for the cap 1 can of course Rubber. Rubber compounds or rubber-like synthetic elastomers that provide compression and Have the reverse properties of rubber when used in the form described herein. That closed end of the shut-off cap can be coated with a liquid silicone to prevent adhesion of the closed end 3 of the cap 1 on the closure of the vacuum container 14 to prevent.

Instead of or in addition to the use of silicones or another lubricant on the outer surface of the closed, flat end 3 can also give it away, for example, with knobs be, in this way sticking of the cap 1 to the vacuum container closure 16 by a minimum Avoid contact surface. 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 range of 0.5 to 1.75 mm can be but can be used depending on the circumstances. With this wall thickness, a sufficient Returning or springing back of the flexible part 2 ensured in its original shape.

In addition to the previously described usage variant the cap according to the invention can also be used for other needles in the same way. For example, the cap 1 can be on a subdermal Needle attached to a syringe for intravenous or intramuscular use Injections in the same patient for consecutive or repeated doses of medication from a simple syringe, for example for anesthesia or cardiac stimulation. Between for such doses the cap springs back and closes the needle until the next dose is administered will.

For this purpose 2 sheets of drawings

Claims (4)

Palent claims: 1. Blood collection needle with two pointed ends and a flange between them for holding, at one end, the piercing end, a blood collection device piercing yours Closure can be attached and its other end, intended for piercing tissue, that Einlichende, is provided with a cap for sterile storage, characterized in that the piercing end (6) of the needle (8) with an after axial deformation easily in its ui spring Form returning, cap (1) not secured against being pulled off by the needle (8) is. which is supported against the flange (10) and on the inside one or more.-e on the needle (8) has adjacent seals (5,29,31). 2. shut-off cap according to claim 1, characterized in that the seal consists of a elongated constriction (31) consists. 3. shut-off cap according to claim 1, characterized in that the seal consists of at least a bulge-like constriction (5,29). 4. shut-off cap according to claim 1 to 3, characterized in that its closed end is rounded and / or is provided with knobs.