EP0278043A2 - Mounting support for blood bags - Google Patents

Abstract

In the invention, the blood bags are placed in cups, and the openings provided in the edge area of the blood bags are suspended in bolts, which are either provided fixed on a central part of the holder or movably on pivotable jaws. The weight-loaded jaws are pivotably arranged on the holder via cranked legs and press under the action of centrifugal force on the edge area of the blood bag, which results in a steadily tightening clamping connection of the blood bag in the holder as the number of revolutions increases during centrifugation.

Description

The invention relates to a holder for blood bags in centrifuges according to the preamble of claim 1.

Such mounts have become known in various embodiments. All embodiments have in common that pins or hooks are arranged on the holder and the blood bag to be held in each case is attached to these pins or hooks with its openings arranged in the edge region. The known holders try to solve the problem, the blood bag in the peripheral area, i.e. thus also in the connection area where the connection tubes open into the blood bag, so that there is no kinking of the tubes and the edge area during the centrifugation process. If such a kinking occurred, erytrocytes would be trapped in this area, and if the blood bag was released from its holder after the centrifugation process had taken place, these trapped erytrocytes would flow into the blood plasma now produced and contaminate this plasma.

So far, it has always been used with plates which support the edge area of the blood bag in order to avoid kinking of this edge area and the connecting tubes guided there during the centrifugation process.

The disadvantage of the known brackets, however, is that Hanging and unhooking the blood bag in the known holder involves a lot of work, and a further disadvantage is that the holding and clamping force of the support devices of these holders is relatively low.

Further known holders according to DE-GM 7 314 447, DE-GM 7 224 121 and DE-OS 2 142 737 provide opposing clamping jaws on the upper part of each blood bag, which are clamped in the edge area of the blood bag, pins of the clamping jaws reach through the openings in the edge area of the blood bag.

The disadvantage here is that tearing out of the more or less full blood bags depending on the filling state and centrifugal force is not avoided with certainty.

The object of the invention is to develop a holder for blood bags of the type mentioned in such a way that the hanging and unhooking of the blood bags in the holder is made considerably easier and that damage to the blood bags by handling or pivoting before centrifuging can be avoided if the holder operates reliably. especially pulling out when centrifuging.

To achieve the object, the invention is characterized in that the bolts forming the suspension of the blood bag are arranged on jaws, which can be hung on a central part above oblong holes or hooks on a horizontal shaft above the cups by means of angled legs, the jaws swing to the center part under centrifugal force.

It is therefore an essential feature of the present invention that a blood bag with its intended openings is placed on the bolts of a cheek with bent legs and remains there in a rest position without any clamping action being provided which could damage the blood bag.

The hoses of the blood bag are simply led out upwards when the blood bag is hooked onto the bolts of the cheek. This eliminates the need to thread the hoses, since no further part is initially provided on the jaws, which could have a clamping effect.

In this fastening position, the blood bag can be handled or pivoted without a clamping action already provided which could lead to damage to the blood bag.

For centrifugation, the blood bag is inserted into a beaker, the bent legs, on the cheek of which the blood bag hangs, are suspended in a horizontal shaft by means of an oblong hole. Here, too, there is no special clamping effect on the edge region of the blood bag, which could lead to damage. Only when centrifuging does the cheek press against the edge of the blood bag due to the centrifugal force.

The jaws are each integrally assigned to two bent legs.

This results in an advantageous, reliable, symmetrical arrangement of the legs with the jaws, wherein depending on the number of revolutions of the centrifuging unit, differently sized weight-loaded jaws can be provided.

Another solution to the problem is provided in another embodiment, that the pins forming the suspension of the blood bag are arranged on a fastening part on which clamping jaws are mounted, which overlap the pins and press the centrifugal force of increasing clamping force against the edge region of the blood bag.

An essential feature here is that the pins are not provided on the clamping jaws, but rather on a fastening part of the cup, and that clamping jaws are also arranged in the edge area of the blood bag and thus also in the connection area of the tubes, which clamps the contact pressure in the edge area of the blood bag during the centrifugation process reinforce. This results in a solidifying clamp connection, as was previously unknown, with an ever increasing number of revolutions of the centrifuge. All previously known clamp connections are independent of the centrifugation force.

There are several different embodiments for forming clamping jaws, the clamping force of which increases under centrifuging force. All embodiments are encompassed by the inventive concept of the present invention.

A first preferred embodiment according to the subject of claim 5 provides that each jaw is attached to the free, pivotable end of a cranked lever, the pivot axis of the lever being arranged on the fastening part. The jaw is understood as the weight on the free, pivotable part of a lever which is pivoted on one side on the fastening part and the lever is bent so that when a centrifugal force acts, the lever is pivoted due to the weight of the jaw and thereby the jaw is caused by the increasingly strong centrifugation force is pressed against the fastening part. In addition to the excellent support of the edge area of the blood bag and the support of the tubes led out through the clamping jaws in corresponding recesses, the additional advantage is achieved that the increasing clamping force upon the action of a centrifugal force supports the edge area of the blood bag produced by welding and thus this edge area from tearing out, Warps, unfolds and the like protects.

In addition, the essential advantage is achieved that the clamping force, which increases during the centrifugation process, does not load the openings in the blood bag, which are attached to the pins, with the centrifugation force, which would entail the risk of tearing out, but rather the entire edge area of the Blood bag is supported by the jaws and pressed against the fastener, thereby resulting these openings are protected from being torn out.

The inventive concept of the present invention not only comprises an arrangement with two blood bags, each blood bag being assigned a clamping jaw, but it is also possible to design a holding part in such a way that only a single blood bag is held and fixed with an associated clamping jaw.

A particularly space-saving construction results when using two blood bags according to the subject matter of claim 6 when the holding part engages in the space between the cups with a shoulder and there with is connected to the cups, and that in each case a clamping jaw, each with a blood bag, is pivotably mounted on levers, which are all located in the same pivot axis.

With the use of pivotably mounted clamping jaws, the blood bag is easy to hold, because the swivel jaw can simply be swiveled up without loosening the corresponding holding device, the blood bag is then hung up on the released pins and the swivel jaw is simply released, which means that it returns to its rest position due to its weight falls, which corresponds to the clamping position at the same time. All parts are held captive on the fastening part, and no complicated insertion or detachment of different parts is required, as are known in the prior art.

The subject matter of the present invention results not only from the subject matter of the individual patent claims, but also from the combination of the individual patent claims with one another. All of the information and features disclosed in the documents, in particular the spatial design shown in the drawings, are claimed to be essential to the invention, insofar as they are new to the prior art, individually or in combination.

• Fig. 1 eine seitliche Schnittdarstellung der Halterung mit Becher nach der Erfindung mit eingehängten Backen,
• Fig. 2 eine Draufsicht der Halterung nach Fig. 1,
• Fig. 3 eine Seitenansicht der Halterung nach Fig. 1,
• Fig. 4 eine Draufsicht auf eine Backe,
• Fig. 5 eine Seitenansicht einer Backe mit Bolzen,
• Fig. 6 Seitenansicht einer Backe von innen,
• Fig. 7 Schnitt durch eine Halterung nach einer weiteren Ausführung der Erfindung zur Halterung von zwei Blutbeuteln,
• Fig. 8 Seitenansicht mit teilweisem Schnitt durch das Befestigungsteil,
• Fig. 9 Stirnansicht des Befestigungsteils nach Fig. 8,
• Fig. 1O Schnitt durch eine Klemmbacke,
• Fig. 11 Seitenansicht einer Klemmbacke von außen,
• Fig. 12 Draufsicht auf eine Klemmbacke,
• Fig. 13 Seitenansicht eines Stiftes zur Halterung des Blutbeutels,
• Fig. 14 Seitenansicht des Hebels zur Schwenklagerung der Klemmbacken.

The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment. Further features and advantages of the invention which are essential to the invention emerge from the drawings and their description. Show it:

• 1 is a sectional side view of the holder with cup according to the invention with hooked jaws,
• 2 is a plan view of the bracket of FIG. 1,
• 3 is a side view of the bracket of FIG. 1,
• 4 is a plan view of a jaw,
• 5 is a side view of a jaw with bolts,
• 6 side view of a cheek from the inside,
• 7 section through a holder according to a further embodiment of the invention for holding two blood bags,
• 8 side view with partial section through the fastening part,
• 9 end view of the fastening part of FIG. 8,
• 1O section through a jaw,
• 11 side view of a jaw from the outside,
• 12 top view of a clamping jaw,
• 13 side view of a pin for holding the blood bag,
• Fig. 14 side view of the lever for pivoting the jaws.

In Fig. 1, the invention is shown with two cups 7, 8, which are attached to a central part 41. The central part 41 has a continuous horizontal shaft 35 in a bore in the upper region, slots being provided in the center of the central part 41 according to FIGS. 2 and 3, in which the shaft 35 is exposed. 5, which are each arranged in pairs on a jaw 38 according to FIG. 4, are hooked onto the shaft 35 via elongated holes 36 according to FIG. 1.

The blood bags, not shown here, have solidified openings in the upper edge region, into which the bolts 37 according to FIG. 5 are inserted in pairs. The bolts 37 consist of a shaft and a bolt head 43 which protects the blood bag against slipping out. The blood bag then hangs freely on the bolt 37 of the leg 34 with the jaw 38 according to FIG. 5 and is inserted from this position into a cup 7 according to FIG. 1 or FIG. 2. In a certain pivot position of the jaws 38, they are pushed onto the shaft 35 via the slot-like bore 36 of the leg 34 and pivoted downward. A firm bond of the cup 7 with the blood bags on the bolts 37 of the jaws 34 with respect to the central part 41 and its shaft 35 is thus achieved.

This means that before the jaws 38 are placed with their projecting legs 34 on the shaft 35, the blood bags are placed on the bolts 37 projecting from the inside of the jaw 38. The blood bags thus prepared are then inserted into the cups 7, 8 and then the jaws 38 are pivoted upward somewhat so that the bores 36 of the elongated holes engage the shaft 35.

The bent legs 34 are then pushed over the shaft 35 and the weight-loaded jaws 38 are pivoted down into their rest or fastening position, so that there is then a clear fastening.

The tubes of the blood bag, not shown here, are advantageously very simply attached. The hoses are first led out on recesses 44 according to FIGS. 2, 4 and 6 of the clamping jaws 38 and fixed by hand when the legs 34 are suspended in the shaft 35. The otherwise necessary threading of the hoses through clamping devices is thus eliminated, since the jaws 38 on the side of the bolts 37 are open.

According to FIG. 1, the jaws 38, shown here without a blood bag, pivot in the direction of the arrow 42, in particular under the action of the forces which occur in the longitudinal direction of the cups 7, 8 during centrifugation. The bolts 37 are inserted with their shafts in holes 40 in the jaws 38. The central part 41 has a bore 39 in which the bolts 37 face each other with their bolt heads 43 in the manner of a stop.

Fig. 3 shows the relatively large one-piece design of the jaws 38 and the arrangement of the legs 34 on the shaft 35. The central part 41 has lateral troughs, with the aid of which the entire holder can be grasped. The entire holder with the cups 7, 8 is suspended in an arm of the centrifuging device via bores in the central part 41, which are not shown here.

Fig. 2 shows the oval design of the cups 7, 8, which are attached with their straight sides to the central part 41, preferably by riveting. It can here several smaller cups can also be provided symmetrically or a single cup with one or two jaws on a horizontal shaft 35.

7, two blood bags 28 are held by the holder according to the invention. Each blood bag 28 rests in an associated cup 7, 8, both cups 7, 8 being connected to one another by a fastening part 1 in that in the space 6 between the cups 7, 8 the fastening part 1 engages with a shoulder 5 and in the area this approach, a rivet connection 9 is provided, which connects the cups 7, 8 to the approach 5.

The cups 7, 8 together with the holder according to the invention are inserted into the suspension of a centrifuge in a manner known per se, the centrifuging force acting in the direction of the arrow 25.

Each blood bag has, in a manner known per se, an edge region 30, which is produced by welding and which passes into a cavity filled with blood or, depending on the intended use, filled with another liquid, which essentially fills the cup 7, 8 in each case.

Tubes adjoin the edge region 30 of the blood bag 28, only one tube 29 being shown in the exemplary embodiment according to FIG.

The object of the holder according to the invention is now to generate a clamping force in the edge area 3O of the blood bag, so that the edge area 3O is securely supported during the centrifugation process and at the same time the tubes 29 are guided out of the blood bag 28 while avoiding kinks.

For this purpose, two spaced slots 17 are provided on the upper side of the fastening part, into which one end of each lever 2 pivotably engages, the pivot axis being formed by a dowel pin 18 extending through the entire bore of the fastening part 1. The respective lever 2 is supported with its end with play in the slot 17 in order to ensure easy pivoting.

For the sake of simplicity, only the holder of the one blood bag 28 is described in the following description, because the holder of the opposite blood bag is exactly identical and is aligned symmetrically to the longitudinal center axis of FIG. 1.

In the area of the broad side of the fastening part 1 after 8, two threaded bores 21, which are at a mutual distance, are provided, into each of which the threaded shaft of a pin (FIG. 13) is screwed. Each pin has a head 10 of an enlarged diameter, which merges into a shaft of smaller diameter.

The diameter of the head 10 is dimensioned such that it fits tightly through the opening of the blood bag, as a result of which the opening of the blood bag then lies on the shaft of the reduced diameter of the pin 4.

So that the entire arrangement can be hooked into an associated hanger of the centrifuge in a suitable manner and without play, a bore 24 according to FIG. 8 is arranged on the underside of the fastening part on each side of the fastening part 1, into which a stay bolt, not shown, engages, which in turn engages is firmly connected to the hanger of the centrifuge and looks out of the hanger at the top. In this way, there is always a safe and precise assignment of the entire holder together with the cups 7, 8 to the hanger of the centrifuge, because the fastening part with its two spaced apart bores 24 is plugged onto the stud bolts of the hanger.

If a centrifugal force acts in the direction of the arrow 25, the levers 2 are pivoted about the pivot axis (dowel pin 18) in the direction of the arrow 26 due to their 90 ° offset. As a result, the clamping jaws 3 are pressed in the direction of the arrow 27 against the fastening part 1, a contact pressure of 150 kg being generated in accordance with the applicant's measurements during a normal centrifugation process. Each jaw 3 is assigned two levers 2, two for connecting the jaw 3 to the lever 2 bores lying one above the other are provided in the respective clamping jaw 3 (see FIGS. 1 and 7) and the bore is penetrated axially by a continuous dowel pin 11.

According to Figure 7, each pin 4 engages in an associated recess 2O on the inside of the jaw 3, the depth 32 (see FIG. 10) is chosen so that it is avoided with certainty that the head 10 of the pin 4 to the bottom the recess 2O strikes when the jaw is pressed in the direction of arrow 26 with its inner clamping surface against the fastening part 1.

The clamping surface of the respective jaw 3 is formed by clamping grooves 23, which receive recesses 12 to 16 between them, through which the tubes 29 of the blood bag 28 are led out without being kinked or pressed.

On the underside of the clamping surface, a bevel 33 (see FIG. 10) is provided in order to prevent the clamping jaw from contacting the blood bag outside the edge region 30 of the blood bag 28 and possibly including any liquid located there.

The fastening part 1 is provided on its upper side according to FIG. 8 with opposing recessed grips 22, so that the entire fastening part 1 together with the cups attached to it can be easily removed from the hanger of the centrifuge, as a result of which the bores 24 with the stud bolts (not shown) on the hanger disengage.

To fasten the blood bag 28 to the holder, the clamping jaw is simply pivoted upwards in the opposite direction to the direction of arrow 26, a holding bevel 31 being provided on the outside of the clamping jaw according to FIG. 10 in order to ensure favorable gripping with the fingers.

After the respective jaw 3 has been pivoted in the opposite direction to the arrow direction 26, the pin 4 is exposed and the blood bag 28 is placed with its opening on the pin, as a result of which the head 10 slips through the opening with a slight deformation of the opening and the blood bag then on the shaft reduced diameter of the pin 4 rests.

The clamping jaw is simply released and swivels automatically under the influence of its weight in the direction of arrow 26 into the position shown in FIG. 7, the hose outlets resting correctly in the recesses 12-16 according to FIG. 12.

In a further development of the present invention, it can be provided that in the area of the clamping grooves 23 there is in each case a permanent magnet which interacts with an associated iron strip in the opposite surface of the fastening part, so that this results in a magnetic holding of the clamping tabs in FIG. 7 shown location is shown. This has the effect that, even if the entire holder is held at an angle, the clamping jaws do not pivot away in the opposite direction to the arrow direction 26, which is also not a problem, because the head 10 of an enlarged diameter on the pin 4 securely holds the blood bag from falling.

When the centrifuge is then started, the centrifugal force then acts in the direction of the arrow 25, and due to the eccentric mounting of the clamping jaws 3 in relation to the fastening device, there is a pivoting in the direction of the arrow 26 and thus a solidification of the clamping connection in the region of the clamping grooves 23 in Direction to the fastening part 1. As already mentioned at the beginning, clamping forces of up to 150 kg can be generated between the jaw and the fastening part.

DRAWING LEGEND

• 1 fastening part
• 2 levers
• 3 jaws
• 4 pin
• 5 approach
• 6 space
• 7 cups
• 8 cups
• 9 riveted joint
• 1O head (pin 4)
• 11 dowel pin
• 12 recess
• 13 recess
• 14 recess
• 15 recess
• 16 recess
• 17 slot
• 18 dowel pin
• 19 slot
• 2O recess
• 21 threaded hole
• 22 finger recess
• 23 clamping groove
• 24 hole
• 25 direction of arrow
• 26 direction of arrow
• 27 direction of arrow
• 28 blood bags
• 29 hose
• 3O edge area
• 31 slant
• 32 depth (recess 2O)
• 33 slant
• 34 cranked thighs
• 35 wave
• 36 hole
• 37 bolts
• 38 baking
• 39 center hole
• 4O hole
• 41 middle part
• 42 arrow direction
• 43 bolt head
• 44 recesses

Claims (10)

1. holder for blood bags, which are arranged in the suspension of a centrifuge, the blood bag has at least two openings in the edge region and on the holder there are pins which grip through the openings of the blood bag and this, as well as its tubes arranged in the connection area of the blood bag against Protect buckling during the centrifugation process, characterized in that the bolts (37) forming the suspension of the blood bag are arranged on jaws (38), which are bent by means of bent legs (34) via elongated holes (36) on a horizontal shaft (35) above the Cups (8) can be hung on a central part (41), the jaws (38) pivoting under centrifugal force onto the central part (41) (FIG. 1). 2. Holder for blood bag according to claim 1, characterized in that the bolts (37) of the jaws (38) are arranged symmetrically to one another and abut one another in the center bore (39) of the central part (41). 3. holder for blood bags according to claim 1, characterized in that the jaws (38) are each integrally associated with two bent legs (34). 4. Holder for blood bags, which are arranged in the hanger of a centrifugal joint, the blood bag has at least two openings in the edge region and on the holder there are pins which grip through the openings of the blood bag and this, as well as its tubes arranged in the connection area of the blood bag Protect buckling during the centrifugation process, characterized in that the pins (4) forming the suspension of the blood bag (28) are arranged on a fastening part (1) on which clamping jaws (3) are mounted, which pass over the pins (4) and press the increasing centrifuging force against the edge area (30) of the blood bag (28) (Fig. 7). 5. Holder according to claim 4, characterized in that each jaw (3) is attached to the free, pivotable end of a cranked lever (2) and that the pivot axis (dowel pin 18) is arranged on the fastening part (1). 6. Holder according to claim 4, characterized in that for holding two blood bags (28) a blood cup (7, 8) is assigned to each blood bag, that the holding part (1) in the intermediate space (6) between the cups (7, 8 ) engages with a shoulder (5) and is connected there to the cups (7, 8), and that on the fastening part (1) a jaw (3) with a blood bag (28) each is pivotally mounted via levers (2) which are all in the same pivot axis (dowel pin 18). 7. Holder according to claim 4, characterized in that each clamping jaw (3) has spaced-apart clamping grooves (23) and that in the space between the clamping grooves (23) recesses (12) for the kink and pressure-free implementation of the hoses (29) Blood bag (28) are arranged. 8. Holder according to one of claims 4 to 7, characterized in that the pin (4) engages in a recess (2O) of the jaw (3), the depth (32) is so great that the head (1O) of the pin (4) does not strike the bottom of the recess (2O) when the clamping jaw (3) comes into contact with the fastening part (1) with its clamping grooves (23). 9. Holder according to one of claims 4 to 8, characterized in that each pin (4) consists of a head (1O) of enlarged diameter and an adjoining shaft of smaller diameter. 1O. Holder according to one of claims 4 to 9, characterized in that in Area of the clamping surface (clamping grooves 23) of the clamping jaw (3) in relation to the fastening part (1) is an easily releasable magnetic connection.

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