DE1951270A1 - Suction device for taking blood - Google Patents

Description

TELEPHONE: 8 AMMEL NO. 22 03 41 TELEGRAMS: ZUMPAT CHECK ACCOUNT: MUNICH S1139

BANK ACCOUNT: BANK H. HOUSES

8 MDNOHENa,

SC 3419

Rhone-Poulenc S.A., Paris / France

Suction device for taking blood

The invention relates to a suction device for taking liquid samples, in particular for the sterile removal of organic ones Fluids such as blood.

The withdrawal of blood from the human body is done for therapeutic purposes or diagnostic purposes, and it is for the latter that the analytical laboratories very often request delivery several separate samples, generally three to five samples, in order to obtain the serum, the plasma, independently of one another and to be able to examine the individual particles presented.

The predominantly used blood collection device generally consists of a hollow puncture needle that is provided with a counter holder attached to a removal tube. The dotted needle is in the vein, in general A vein is inserted in the bend of the elbow, and the blood is immediately drawn into the patient under the action of venous pressure The receiving tube is allowed to flow, if necessary with a pressure cuff. This arrangement is poorly suited

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for filling multiple tubes as it is difficult to avoid spillage of blood at the moment of tube change, as the blood flow cannot be interrupted.

Devices for withdrawing blood are known in which the puncture needle is attached to a syringe. Leave with it take the necessary amounts of blood and distribute it into several collection tubes. The handling of such devices is difficult and sensitive and requires the use of both hands, and it often happens that the The needle misses or pierces the vein.

In order to remedy these disadvantages, one-time applications were made for in general Proposed use of certain devices with a receiving tube closed by a stopper are provided in which there is a vacuum. To collect blood, the puncture needle is connected to each of the under vacuum Tubes brought into communication, for example, by piercing the stopper. The tubes then fill up immediately with blood. Maintaining the vacuum is unsafe, however, and the blood can begin to be drawn through the sudden suction under the influence of the vacuum and by the subsequent flow during the strong suction in the The needle and collection tube can be changed, which in turn can collapse the vein.

The invention provides a simple, easy-to-use device for single use, which is used to take one or more separate liquid samples, especially from Blood, both sequentially and simultaneously, especially is suitable and does not exert any gross influence on the removed liquid.

The suction device according to the invention for removing liquids, in particular of blood, with a suction tube that is connected to a receiving tube and one on a

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Has stem attached piston, which is in the receiving tube
is characterized by at least one receiving tube which contains a piston provided with a perforated elastic partition, which is provided with a groove at least in the area of its side facing the tube opening, at least one support shaft which is connected at one end to the suction tube and at other end at least with
two clamping jaws are provided, which are shaped and dimensioned so that they can engage in the groove of the piston at the base of the receiving tube, the clamping jaws are under elastic pretension until the piston is released or extended and si.ch spread as soon as they emerge from the receiving tube, a hollow needle arranged between the clamping jaws of the shaft, which is able to remove the partition of the
To pierce or perforate the piston so that the interior of the receiving tube can communicate with the channel of the suction tube.

The invention is described below with reference to the appended designations explained in more detail, for example.

Fig. 1 shows in perspective view the elements forming the device according to the invention and the piston in FIG
Cut;

Fig.? shows in view and partially in section a variant of this device.

The device according to FIG. 1 has at least one cylindrical receptacle 1 which is formed by a tube with a flat or rounded bottom. The receiving tube 1 contains
a piston 2, which closes the tube sealingly and with a slight frictional resistance over almost the entire length of the
Rohrs slidably move ". The piston 2 is with a
perforable elastic closure or partition wall 15 provided and has a circumferential groove 3 on the front. The piston is arranged in the receiving tube so that
its front is turned against the pipe opening. For the

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The receiving tube thus provided with a piston is used on or in a substantially cylindrical receiving shaft which is essentially the same Has the same length as the receiving tube. This sponsorship, which is im hereinafter referred to as "carrier" for short, generally consists to facilitate handling with a base 5 made of one piece. A channel 6 runs through the carrier 4, which is extended through the base and connected to the suction pipe 9 via a suitable connection piece 7 can, which in turn is generally connected to a puncture needle 8. The channel 6 goes on the opposite end into a hollow needle 10, which is able to pierce the separating v / and 15 of the piston. The carrier 4 is about a Part of its height is hollow, which makes up 1/4 to 9/10, preferably 1/3 to 2/3 of its total height.

The side wall thus formed is slotted in the longitudinal direction through one or more slots 11, in general is considered expedient to provide two to five longitudinal slots, preferably three such slots. the Lamellae 12 determined in this way by the lateral wall of the carrier or the holder are bell-like at their end towards the outside spread. This can be achieved, for example, in that these ends move outwards beyond their elastic limit pulled out so that they remain deformed.

The ends of these lamellas form an inner transverse rib 13, the upper edge of which is frustoconical and dimensioned so that that it can engage in the circumferential groove 3 of the piston 2. The lamellas form a number of jaws that the Be able to grasp the piston itself on the base of the receiving tube «

The hollow needle 10 is generally in the axis of the support shaft so arranged between the jaws that they can pierce the elastic partition of the piston. The extension piece 7 can be arranged parallel to the axis of the carrier 4. However, it is generally arranged laterally on the base 5 set.

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At least one inner stop 14 is preferably provided at the open end of the receiving tube to prevent the piston from exiting to "prevent. In general, just as many noses or Stops such as slots 11 are provided and also distributed in the same way, which if necessary can be found in the interior of this Slide in or insert slots. The profile of these extension pieces is chosen so that the piston easily enters the receiving tube can be inserted and retained therein.

The device according to the invention works as follows: Before After removal, the receiving tube provided with the piston is placed on the support shaft, whereby the piston is already through the end of the clamping jaws 12 partially pushed into the receiving tube became. During use, the doctor or the person carrying out the removal pushes the tube onto the carrier shaft, until the piston hits the bottom of the tube, with the result that the hollow needle 10 pushes through the piston and pierces the partition 15, the clamping jaws engaging in the groove 3 at the same time. Eventually at the bottom of the Any remaining air in the receiving tube is expelled through the channel 6.

The device is now ready for removal. If blood is to be taken, the doctor inserts the puncture needle into the Vein of the patient and then slowly pushes the tube back on the support shaft. The one with the sponsorship of the Clamping jaws also pushed back piston slides along the receiving tube against its open end. This creates blood sucked into the evacuated volume, which is increasing in size, like a syringe.

When the piston reaches the open end of the receiving tube, the up to now easily counteract with their side walls the inside of the receiving tube pressed jaws into the open, relax and spread and thus give the groove of the Piston free. The one no longer pulled through the holding shaft

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The piston remains at the end of the receiving tube, which remains hermetically sealed. So the piston forms in this way a stopper. The needle 10 connected to the holding shaft is simultaneously withdrawn and withdrawn from the piston, and that hole formed by it closes automatically. The stops forcibly hold the piston inside the receiving tube back, even if an occasional incorrect operation of the device should occur. The one filled with blood and tightly sealed receiving tube is immediately available for laboratory analysis, v / o it either directly in a centrifuge can be used or placed on any of the known types of sampling needles.

It is particularly interesting that the one previously inside the pickup tube Like the plunger of a syringe, the sliding plunger automatically acts as a stopper without the doctor's need Needs to change hand movement. This remarkable feature makes this arrangement particularly convenient to use.

However, the device offers even more advantages when several separate samples are to be taken. In Fig. 2 is a Embodiment of the device according to the invention shown, with which three separate samples can be taken.

The puncture needle 8 is attached directly to the shoulder 7 placed on the side of the base 5 without a flexible intermediate tube, which is connected to three identical support shafts 4. A receiving tube provided with the associated piston is placed on this support shaft. One with the puncture needle connected channel 6a communicates with each of the receiving tubes. It can be seen that such a device is particularly easy to operate; the needle 8 goes into the patient's vein inserted, and the doctor, who now holds the device on its base with one hand, only needs with the other Hand pull back the three receiving tubes, one after the other or at the same time, until they are filled,

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- 7 are locked automatically.

Advantageously, a displacement device, for example a lifting device can be provided for the simultaneous retraction of the receiving tubes.

Of course, this device can have many modifications. For example, a hollow needle 10, which is sharpened at both ends, can be attached to an extension piece, which is pushed onto the piston with effort. This allows liquid to be drawn from the interior of the receiving tube will. A second elastic partition then closes the ends of the channel 6 of the support shaft 4. With this device

blood can be drawn several times in a row without some of it is spilled. The attacks cannot be immediate either be attached to the receiving tube, but on a part that is independent of the tube, for example on one around the receiving tube bezel ring placed around at its opening end. If that. The receiving tube is intended for single use only, then so the part provided with the stops can be used again. The suction tube can be used immediately, or it can be connected to a puncture needle via a probe. A number of such receiving tubes can be arranged in parallel, the number is usually limited to five. The channels can be equipped with one-way ball valves, especially for the case of successive withdrawals. Using suitable devices, it can also be gripped and held at the same time several receiving tubes are facilitated, for example by Arrangement of a receiving tube set in a closed protective casing, the front sides of which are provided with openings provided with stops is perforated and the back of which can only be unlocked and opened in the analysis laboratory. Such a wrap, the one with all for the clear identification of the tubes necessary information can be labeled, ensures complete safety in handling and leaves any Avoid errors. Other embodiments can also be used in the

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Holding devices of the piston, the shape of the piston, the carrier or various devices forming the device according to the invention Elements are provided. However, the scope of the invention is not left if the basic principles described here Features are included, particularly when the piston is converted into a plug inside the receiving tube.

The materials used are synthetic, inert and elastic materials primarily in question. For example, polyethylene, polystyrene, polymethyl methacrylate, etc. can be used will. It is advisable to use transparent material so that the filling level of the receiving tube can be easily monitored can. The piston can also be made of rubber or any other suitable Consist of elastomer. The needles are generally made of stainless steel.

The construction of the device according to the invention is simple and permitted an economic use, even if this what is generally the case, is used only once.

It is easy to put a suitable reagent in the collection tube beforehand introduce, for example, a few drops of sodium or heparin citrate solution. The reagent can also be used in the same way granulated form are introduced into the channel 6 above the piston. The blood dissolves the granules before they enter the Receiving tube enters so that a homogeneous sample is obtained without the need for stirring. The inventive The device is particularly easy to handle and helps avoid clumsiness on the part of the person carrying out the removal to avoid. This can regulate the speed of blood collection itself and set it to a desired value, to report any sudden and violent impact on the blood.

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With the device according to the invention, very different liquid samples can be taken easily and simply. the previously filled device can also be used in a distributor, e.g. for injections as a dropper, especially if the removed liquid is to be dosed or used for smear analyzes. Leave it In particular, certain volumes of liquid can also be withdrawn again or repeatedly without the stopper to remove, whereby the new withdrawal can take place if the plunger has previously been pierced by the dispensing pipette.

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Claims (11)

Claims (l. / Device for the extraction of liquids, in particular of Blood, with a suction tube that is connected to a receiving tube and with a piston held by a shaft, the is slidably guided in the receiving tube, characterized by at least one receiving tube, one with a perforatable Contains elastic partition provided piston, at least in the region of its, the tube opening facing side is provided with a groove, at least one support or holding shaft, which verbun-Ii at one end with the suction pipe den and at the other end is provided with at least two clamping jaws, which are shaped and dimensioned so that they into the groove of the piston can intervene at the base of the receiving tube, wherein the jaws are elastically biased until the piston is released and spread as soon as they are out of the Exit receiving tube, a hollow needle arranged between the clamping jaws of the shaft, which needle is able to reach the partition to pierce the piston so that the interior of the receiving tube can communicate with the channel of the suction tube. 2. Suction device according to claim 1, characterized in that the suction channel is extended by a puncture needle. 3. Suction device according to claim 1, characterized in that that the receiving tube is provided at its open end with at least one inner stop in order to fully disengage the To prevent piston. 4. Suction device according to claim 1, characterized in that that the hollow needle in the axis of the holder or /. of the support body is arranged. 5. Suction device according to claim 1, characterized in that the end of the support shaft adjoining the clamping jaws closed by a perforable elastic partition 009815/0501 is and that the ground or sharpened at both ends Hollow needle is positively connected to an adjustable transition piece on the piston. 6. Suction device according to claim 1, 2, 3 or 4, characterized in that that at least two support shafts are connected to the same intake duct. 7. Suction device according to claim 6, characterized in that the support shafts are parallel on a common base are arranged. 8. suction device according to claim 7, characterized in that that the receiving tubes with respect to the support shafts by a Shifting device can be pulled out at the same time. 9. Suction device according to claim 8, characterized in that the receiving tubes in a common protective cover are housed. 10. Suction device according to claim 1, characterized in that at least one stop on a different from the receiving tube Part is set. 11. Suction device according to claim 1, characterized in that the inner channel of the support shaft contains a reagent. 009815/0501 Blank page