EP0597070A4

EP0597070A4 - Removal of blood product from a container.

Info

Publication number: EP0597070A4
Application number: EP93912084A
Authority: EP
Inventors: Michel Joie; Jean-Claude Bernes; Alphonse Heremans; Ermenegildo Lavezzo
Original assignee: Baxter International Inc
Current assignee: Baxter International Inc
Priority date: 1992-05-29
Filing date: 1993-03-23
Publication date: 1996-07-24
Anticipated expiration: 2013-03-23
Also published as: EP0597070A1; DE69318255D1; WO1993024371A1; DE69318255T2; EP0597070B1; JPH06509968A

Abstract

A method for removing a frozen liquid (14) form a plastic container (12) without thawing the liquid is provided comprising the steps of: breaking an interfacial bond between the frozen liquid and plastic container by cutting the container along a circumference (20) thereof between a first and second end of the container; and removing the frozen liquid from the resultant cut container. An apparatus for removing liquid from a plastic container without thawing same is also provided. The apparatus includes a body (16) defining an interior for receiving the container. The body includes within the interior at least one cutting member (32) that is so constructed and arranged that it cuts the container along a circumference thereof when the container is received within the body. Additionally, the apparatus includes means (52) for removing the frozen liquid from the container.

Description

S P E C I F I C A T I O N

TITLE

REMOVAL OF BLOOD PRODUCT FROM A CONTAINER BACKGROUND OF THE INVENTION

The present invention relates generally to removing contents from a plastic container. More specifically, the present invention relates to removing a frozen liquid, such as a blood product, from a plastic container.

Of course, it is known in the medical industry to collect blood from human donors and store same in a plastic container. Such blood can either be directly infused, as whole blood replacement to patients, or broken down into its various components, such as plasma, red blood cells, and platelets. By breaking blood down into its components, this allows the blood product to be used more efficiently to replace the necessary component the patient may need. It is also known to store blood components, such aε plasma, in sterile, flexible plastic containers. This allows small quantities of plasma, usually a pint or less, to be stored until a sufficient quantity of plasma is collected for processing into the various components. After enough of the frozen plasma has been accumulated for a batch, the frozen slugs of plasma can be removed from the plastic containers and processed through the necessary equipment.

In using the frozen slugs of plasma, it is important that the frozen plasma is quickly removed from the plastic containers after the containers are taken from the cold storage. Premature thawing of the frozen slugs of plasma allows precipitates, which are produced during the freezing process, to go back in the solution, thus reducing the processing yield- Recently, examination of frozen plastic containers including plasma demonstrates that at target processing temperatures of -40^βC, an interfacial bond is created between the plastic container and the plasma. It is believed that this bond may be created by water that is absorbed into the matrix of the polymer during the autoclaving process. At the low temperatures involved in the storage of plasma (-40^βC) , a physical bond is formed between the plasma and the residue moisture in the polymer of the container. As this residue moisture level varies, so also can the strength of the physical bond. One possible method for removing the frozen plasma from the container is through the utilization of heat. However, the utilization of heat to break the bond can damage the plasma due to temperature fluctuations that can denature the proteins. Some typical previous practices to retrieve frozen plasma from polymer containers either required product preconditioning in the -10/-20°C range, or required a skin thaw process. It is also known to use a low temperature shock (-80°C) to weaken the container and break it by heavy shaking. Disadvantages with these processes, aside from the concerns with temperature fluctuations also include the fact that these techniques require a two-step process.

One previous method of opening such a container included cutting or slicing off one end of the container after such processing. The disadvantage of such a process is that it tends to be a slow operation that permits excessive thawing of the frozen product. This reduces the yield of the processing operation. Further, the manual cutting process can expose the frozen plasma product to human contact which can cause contamination of the plasma being processed and may create some risks for the operator. U.S. Patent No. 3,939,623 discloses a plasma collection system in which frozen plasma is thawed before the plasma containers are cut open. The containers are carried on a conveyor passed a cutting tool that cuts open the container and allows the liquid contents to fall into a collection vessel. A disadvantage of the system is that the premature thawing reduces the process yield and therefore the system is not suitable for removing frozen slugs of plasma.

UK Patent GB 2044220B (corresponds to U.S. Patent No. 4,253,458) discloses a method and a multiple-bag collection apparatus in which plasma can be collected, separated from the blood cells, frozen, and then removed from its container while frozen, if desired, on an automated basis. The method comprises freezing the plasma to block form in the container, cutting the shoulder portion away from the rest of the container, after the plasma has frozen, to define an open, cut end, and expelling the plasma in frozen block form from the container through the open end, by collapsing the opposed walls towards each other, the side edges of the opposed walls, which define side edges of the container, diverging towards the opened end of the container in the collapsed configuration of the container.

UK Patent GB 2141723B discloses a polyester composition and collapsible container made therefrom for use in the medical field for storing blood and blood components. The .container can be used in the method disclosed in the U.S. Patent No. 4,253,458. European Patent No. 057189 provides an apparatus for removing the contents of a compressible container comprising a compression member including a pair of plates relatively movable between an open spaced apart position to receive the container, and a closed position to compress the container to discharge its contents, an operating member for moving the plates from the open position to the closed position, and a retention member cooperatively associated with the plates to retain the container therebetween during the compression.

SUMMARY OF THE INVENTION

The present invention provides an apparatus and process by which a frozen liquid, such as a frozen blood product, can be removed from a plastic container. Pursuant to the present invention, the container can be processed at storage temperatures (approximately -40^CC) without an intermediate preconditioning step. Therefore, a one-step operation of debonding the frozen product from the container walls and opening and expelling the frozen product is achieved.

To this end, a method for removing a frozen liquid from a plastic container without thawing the liquid is provided comprising the steps of: breaking an interfacial bond between the frozen liquid and plastic container by cutting the container along a circumference thereof between a first and second end of the container; and removing the frozen liquid from the resultant cut container.

In an embodiment, the container is cut helically. In an embodiment, the method includes the step o rotating at least one cutting member around the container to cut the container. In an embodiment, the method includes the step of moving, or rotating, the container along at least one cutting member to cut the container.

In an embodiment, the method includes the step of removing the frozen liquid from the container by passing the cut container through means that expels the frozen liquid from the cut container.

In an embodiment, the method includes the step of removing the frozen liquid from the cut container by pulling on at least one end of the cut container to remove the container from the frozen liquid.

In an embodiment, the method includes the step of removing the frozen liquid from the cut container by passing the cut container between a pair of rollers. In an embodiment, the method includes the step of removing the frozen liquid from the cut container by using a pair of plates.

The present invention also provides an apparatus for removing liquid from a plastic container without thawing same. The apparatus includes a body defining an interior for receiving the container. The body includes within the interior at least one cutting member that is so constructed and arranged that it cuts the container along a circumference thereof when the container is received within the body. Additionally, the apparatus includes means for removing the frozen liquid from the container.

In an embodiment, the apparatus includes means for rotating the cutting member with respect to the container. In an embodiment, the apparatus includes means for rotating the container with respect to the cutting member. In an embodiment, the apparatus includes two cutting members. In an embodiment, the cutting member is oriented at an angle so as to create a helical cut in the container. In an embodiment, the means for removing the frozen liquid includes two rollers.

In an embodiment, the means for removing the frozen liquid includes two plates.

Additional features and advantages of the present invention are described in, and will be apparent from, the detailed description of the presently preferred embodiments and from the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a perspective cross-sectional view of an embodiment of a portion of the apparatus of the present invention.

Figure 2 illustrates a top elevational view of a cross-section of the apparatus of Figure 1 along lines II-II of Figure l. Figure 3 illustrates a top elevational view of a cross-section of the apparatus of Figure 1 taken along lines III-III of Figure 1.

Figure 4 illustrates a container after it has been cut pursuant to an embodiment of the present invention. Figure 5 illustrates the container after it has been cut pursuant to a further embodiment of the present invention.

Figure 6 illustrates an embodiment of a further stage of the apparatus of the present invention. Figure 7 illustrates a further embodiment of a method for removing the plastic container from the frozen product. - 1 -

Figure 8 illustrates a further embodiment of a method for removing the plastic container from the frozen liquid.

Figure 9 illustrates a further embodiment of the method for removing the plastic container from the frozen product.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS The present invention provides a method and apparatus for removing a frozen liquid, preferably a frozen blood product, from a plastic container. As has previously been stated, it is known to store blood, and its components, in a frozen state in plastic containers. Typically, a frozen blood product, such as plasma, is stored at -40°C.

As has been previously stated the prior art suffers certain disadvantages in providing apparatus and methods for removing the frozen plasma from the plastic container so that the same can be combined and/or used. These disadvantages include: requiring a temperature preconditioning step, either thawing or thermal shock, during which temperature fluctuations can occur that can cause the proteins to denature; and a difficulty in overcoming an interfacial bond that is created between the frozen blood product and plastic container.

The present invention provides a method and apparatus that overcomes these disadvantages. Pursuant to the present invention, preferably, an apparatus including two work stations or stages is provided: a cutting-debonding mechanism; and a slug expelling station. Although, for the sake of clarity, these stations are illustrated separately it should be noted that these stations can be part of one apparatus. As set forth in detail below, the present invention provides a process, as well as apparatus, by which the interfacial bond between the plasma and frozen container can be broken and the polymer container cut open allowing the frozen content to be easily expelled.

Referring now to Figure 1, a perspective view of the cutting-debonding stage 10 of the apparatus of the present invention is illustrated. As set forth in detail hereinafter, a container 12 including a frozen blood product 14 enters the device 10 in a frozen state and exists the device in a state in which the interfacial bond between the blood product and container has been broken as well as the container cut.

To this end, the device 10 includes an elongated body 16 having an entry opening 18 and an exit opening

20. As illustrated in Figure 2, the elongated body 16 defines an interior 28 having a perimeter 20 that allows the frozen blood product containers 12 to be received but prevents the container 12 from rotating either εide- to-side or end-over-end as it travels through the elongated body 16. Accordingly, the container 12, as it moves from the entry opening 18 to the exit opening 20, maintains a relatively constant lateral position with respect to the elongated member 16. The device 10 includes a rotatable drum 26 that is preferably constructed so that it can rotate in a clockwise manner. Of course, if desired, the drum 26 can be oriented so that it rotates in a counterclockwise manner. In the preferred embodiment illustrated, the rotatable drum 26 is located at approximately the middle of the elongated member 16. Thus, the rotatable drum 26 divides the elongated member 16 into an upper half 28 and a lower half 30. However, the rotatable drum 26 can be located so as to be closer to either the entry opening 18 or the exit opening 20 of the elongated member 16, if desired.

Coupled to the rotatable drum 26, in the preferred embodiment illustrated, are two cutting members 32 and 34. The cutting members 32 and 34 are biased into an interior channel 36, located between the upper half 28 and lower half 30 of the elongated member 16 by biasing members 38. In the preferred embodiment, the biasing members 38 are springs. As illustrated, the cutting members 32 and 34 can be rotatable rigid wheels 41 having a cutting surface. Other cutting surfaces, however, can be utilized, such as blades, knives, and the like.

As illustrated in Figure 3, the cutting members 32 and 34 are so constructed and arranged that they are biased into the interior channel 36 and contact a surface 40 of the container 12 as the container passes from the elongated member 16 entry opening 18 to the exit opening 20. This causes the cutting members 32 and 34 to cut the container 12 as the container passes through the elongated member 16. At the same time, it has been found that the cutting members 32 and 34 will break the interfacial bond between the frozen plasma and the container 12. Preferably, the cutting members 32 and 34 are oriented at an angle a with respect to the horizontal plane, and thereby the surface 40 of the container 12 as the container 12 passes through the elongated member 16. This causes, as illustrated in Figures 4 and 5, the cutting members 32 and 34 to create helical cuts 43 in the container 12a. The combination of the angle α and the rotation of the cutting 32 and 34 around the container 12 creates a "screwing" effect that forces the container to move axially into the rotatable drum 26. During the cutting process, the shear stress caused by the cutting members 32 and 34 penetrating the container 12 results in the desired debonding effect. Of course, if desired, cuts other than helical cuts can be made in the container 12. Likewise, if desired, only one cutting or more than two cutting members can be utilized.

Figure 4 illustrates, by way of example, a one- turn helical cut 43 in the container 12a. By way of example. Figure 5 illustrates a two-turn helical cut 43 in the container 12a.

It should also be noted that although in the preferred embodiment illustrated, the container 12 remains in a relatively fixed lateral position and the rotatable drum 26, and thereby the cutting members 32 and 34, rotate thereabout, if desired, the cutting members can be fixed and the container can be rotated with respect to the cutting members 32 and 34. As illustrated, as a container 12a exits the elongated member 16, it has been cut along a circumference and length thereof. The container 12a is then fed to an expelling station 50. As used herein, expelling station 50 means a station wherein the frozen blood product is removed from the cut container 12a. The container 12a is fed by the lower half 30 of the elongated member 16 directly to the expelling station 50 in the position it was fed into the entry opening, i.e., top end first. Referring now to Figure 6, an embodiment of the expelling station 50 is illustrated. In the illustrated embodiment, two opposed rollers 52 and 54 are provided that rotate in opposing directions. In use, an end 56 of the cut container 12a is fed between the rollers 52 and 54. The rollers 52 and 54 are motorized and have surfaces 58 that are designed to grip the container. Therefore, the cut container 12a is grabbed by the rollers 52 and 54. At least one of the rollers is spring loaded so that the space between the rollers can open slightly. This allows the cut container 12a to be pulled therethrough. At the same time, the rollers 52 and 54 expel the frozen plasma 14 from the container. Although not illustrated, a bin or other receptacle for receiving and collecting the plasma will be located at this stage.

It should also be noted that other methods for expelling the frozen plasma from the container can be used. These include, as illustrated in Figure 7, grasping the container 12 at an end 62 and unwinding the plastic from the frozen plasma 14. This process can either be manual or using an automated process.

Additionally, as illustrated in Figure 8, each end 56 and 62 of the container 12a can be grasped and pulled causing the plastic container to separate from the frozen plasma 14. Again, this can be a manual or automated process.

Illustrated in Figure 9 is a further embodiment of the expelling station 150. As illustrated, the container 12a can be fed between two plates 64 and 66. The expelling station 150 includes a clamp 69. One end 56 of the container 12a is secured between the clamp 69. To expel the plasma, one or both of the plates 64 and 66 can be movable toward each other. As the plates 64 and

66 are moved toward each other, because the end 56 of the container 12a is secured, the frozen plasma 14 is expelled from the container (illustrated by the arrow) . It is important to note that because the container 12a has been cut helically along a length thereof pursuant to the method of the present invention, the interfacial bond between the plastic container 12 and the frozen blood 14 is broken. This allows a variety of methods and means for expelling the frozen liquid product 14 from the plastic container 12.

The present invention also provides, in addition to the apparatus, a method for removing the frozen blood product 14 from the plastic container 12. The method allows the product to be removed without a preconditioning temperature state. Accordingly, the frozen blood product 14 can be taken directly from storage and removed from the plastic container 12. It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its attendant advantages. It is therefore intended that such changes and modifications be covered by the appended claims.

Claims

WE CLAIM:

1. A method for removing a frozen liquid from a plastic container without thawing the liquid comprising the steps of: breaking an interfacial bond between the frozen liquid and plastic container by cutting the container along a circumference thereof between a first and second end of the container; and removing the frozen liquid from a resultant cut container.

2. The method of Claim 1 wherein the container is cut helically.

3. The method of Claim 1 including the step of rotating at least one cutting member around the container to cut the container.

4. The method of Claim 1 including the step of moving the container along at least one cutting member to cut the container.

5. The method of Claim 1 including the step of removing the frozen liquid from the container by passing the cut container through means that expels the frozen liquid from the cut container.

6. The method of Claim 1 including the step of removing the frozen liquid from the cut container by pulling on at least one end of the cut container to remove the container from the frozen liquid.

7. The method of Claim 1 including the step of removing the frozen liquid from the cut container by passing the cut container between a pair of rollers. 8. The method of Claim 1 including the step of removing the frozen liquid from the cut container by using a pair of plates. 9. A method for removing a frozen blood product from a plastic container comprising the steps of: cutting the container along substantially a length thereof between a first end and a second end to break an interfacial bond between the frozen blood product and plastic container; and separating the plastic container from the frozen blood product.

10. The method of Claim 9 wherein the container is cut helically along substantially its length.

11. The method of Claim 9 including the step of rotating at least one cutting member around the container to cut the container.

12. The method of Claim 9 including the step of moving the container along at least one cutting member to cut the container.

13. The method of Claim 9 including the step of separating the frozen liquid from the container by passing the cut container through means that expels the frozen liquid from the cut container.

14. The method of Claim 9 including the step of separating the frozen liquid from the cut container by pulling on at least one end of the container to remove the container from the frozen liquid. 15. The method of Claim 9 including the step of separating the frozen liquid from the cut container by passing the cut container between a pair of rollers.

16. The method of Claim 9 including the step of separating the frozen liquid from the cut container by using a pair of plates.

17. An apparatus for removing a frozen liquid from a plastic container without thawing same comprising: a body defining an interior for receiving the container, the body including within the interior at least one cutting member so constructed and arranged to cut the container along a circumference thereof when the container is received within the body; and means for removing the frozen liquid from the container.

18. The apparatus of Claim 17 wherein the body includes means for rotating the cutting member with respect to the container.

19. The apparatus of Claim 17 wherein the body includes two cutting members.

20. The apparatus of Claim 17 wherein the cutting member is oriented at an angle so as to create a helical cut in the container.

21. The apparatus of Claim 17 wherein the means for removing the frozen liquid includes two rollers.

22. The apparatus of Claim 17 wherein the means for removing the frozen liquid includes two plates. 23. An apparatus for removing a frozen blood product from a plastic container comprising: a receptacle for receiving a plastic container including a frozen blood product, the receptacle defining an interior including at least one cutting blade so constructed and arranged as to create a helical cut substantially along a length of the container; and means for removing a resultant cut plastic container from the frozen blood product.

24. The apparatus of Claim 23 wherein the receptacle includes means for rotating the cutting member with respect to the container.

25. The apparatus of Claim 23 wherein the receptacle includes two cutting members. 26. The apparatus of Claim 23 wherein the means for removing the frozen liquid includes two rollers.

27. The apparatus of Claim 23 wherein the means for removing the frozen liquid includes two plates.