CN1153669A

CN1153669A - Flexible filtering pouch

Info

Publication number: CN1153669A
Application number: CN 96120367
Authority: CN
Inventors: 让-丹尼斯·罗莎
Original assignee: Elp Rochat
Current assignee: Elp Rochat
Priority date: 1995-10-26
Filing date: 1996-10-28
Publication date: 1997-07-09

Abstract

The disposable flexible pouch for collecting and filtering blood has two inner chambers separated from each other by a filtering screen (11). The pouch is formed from two superposed walls (1, 2) made of a flexible plastic material and bonded together by welding of their respective peripheral edges (3). The inlet and the outlet openings for the blood, as well as an outlet opening (5) for the suction air provided with a bacterial filter, are all made in the same wall (2) forming the pouch and the filtering screen (11) having a lower surface at the surface of this same wall (2) cooperates with the inner face thereof to form several compartments communicating with one another and forming the second chamber, so that the retention volume is reduced.

Description

Flexible filtering pouch

The invention relates to a kind of tractable flexible filtering pouch, especially in the surgical operation or after the operation, a kind of instrument of collection and filtering blood under aseptic condition, for example the application goes into the patent EP0 that is applied for, overanxious bag on the typical articles in 525,493.

In fact, the actual use show, the tractable flexible bag that above-mentioned file is mentioned remains the shortcoming that produces owing to its structure and manufacturing.Particularly, this bag (for example at patent EP0,525,493 is shown in Figure 1) comprises two essentially identical cavitys of volume, is separated by the elasticity filter wall of for example polyester of inside each other.In fact, this structure provides one first to keep cavity for blood to be filtered, between this chamber inlet and filter wall significant volume is arranged, and the very fast gathering between the outer wall in this chamber and self-filtering wall of a large amount of blood to be filtered.All the more so when filter wall is blocked owing to the blood caking of collecting, and also have solid particle in the blood.This relatively large retention volume is actual to be disadvantageous.On the one hand, because the bigger fact of filter surfaces that contacts with blood to be filtered, make and drive the pressure differential decline that blood flow is crossed two chambeies of filter wall, on the other hand, owing to the bottom of the delivery pipe that can not pass through the filter downstream from bag enters in the resid vol, make resid vol not recover.

Therefore, the purpose of this invention is to provide a kind of tractable flexible filtering pouch, it does not have the shortcoming of above-mentioned known bag, is particularly useful for collecting the instrument with filtering blood.

Above-mentioned purpose, but the article of a kind of flexible filtering pouch of the application of the invention reach, this overanxious bag has two inner chambers, separated by a sieves each other, first chamber links to each other with the outside by the outlet of the blood that filters, and the inlet of second chamber by pending blood links to each other with the outside, the wall that this bag made by two elastoplast is formed, a wall is placed above another, with they separately peripheral welded together, it is characterized in that, the entrance and exit of blood, and the outlet that the suction air of biofilter is housed all is contained on the same wall of this bag; Sieves has the less surface area of more same wall, with its inner surface combined effect, forms several cells, and these cells are connected with each other and form said second chamber, and therefore, retention volume reduces.

Now, by the summary of schematic figures is described, and, the present invention is described in more detail by the specific embodiment of filter bag.

Fig. 1 is common three-dimensional part exploded view.

Fig. 2 is the plane graph of a bag wall that forms the bag of Fig. 1.

Fig. 3 is the schematic cross sectional views of function of the bag of key diagram 1.

Just as shown in Fig. 1 to 3, flexible filtering pouch of the present invention itself is by two walls separated from one another 1 and wall 2, forms with known method, and these two walls are preferably made by PCV, and smoothly assemble along its periphery 3.

Wall 1 is made by PVC, and it is very simple, both do not had opening also without any add-on assemble.On the contrary, wall 2 is also made by PVC, and is shown specifically as Fig. 2, and 3 openings are arranged, i.e. first opening 4, be used for the inflow of pending blood and suction gas, second opening 5 is as first opening, be positioned at the top of wall 2, be used for the outflow of gas, and the 3rd opening 6 is positioned at the bottom of wall 2, is used for the outflow of filtering blood.Export 6 places at blood inlet 4 and blood, connection tube 7 separately and 8 is connected on the PVC wall by welding.The polypropylene sieve is equipped with in gas outlet 5, and electrostatic interaction is arranged, as biofilter.

As shown in Figure 1, be used for the effusive connection tube 8 of filtering blood, can link to each other with another external drain 9, extend to and cover on 10, lid 10 is integrally formed with the connection tube of pending blood and suction air.Lid 10 is collected and filtering blood instrument (not shown) with a kind of being used for hermetically at activity site, as the patent EP0 that the applicant applied for, and the type described in 525,493, synergism.

On the other hand, as for filtration itself, the wall made from PVC 2 has above-mentioned

opening

4,5,6, and wall has sieves 11 within it, and this sieves is preferably made with polyester, mesh from 20 μ to 500 μ, for example about 150 μ.This sieves is handled with heparin usually, makes hydrophobicity to reduce blood clotting.

The surface of its wall 2 of being connected of the surface ratio of filter 11 is little.In fact, no matter because polyester filter 11, or the polypropylene antibacterial filter on the air outlet slit 5, all be not suitable for directly welding with PVC simply, the member of these two filters is by equally also being that the counterpart member 12 that PVC makes is welded on the PVC wall, and places, and filter member is sandwiched between the two PVC layers, adopt mode commonly used then, use high-frequency welder to weld.

Counterpart member 12 has an opening to match with air suction inlet 5, has several extended horizontal openings 13 to make filtering blood flow mistake simultaneously.More particularly, the counterpart member 12 that PVC makes is soldered on the wall 2 along periphery welding 14 and (is also made by PVC), thereby clamps sieves 11.Around air outlet slit 5 in the form of a ring a weld seam 15 is substantially arranged.Also have horizontal welding island (weld islands) 16 (see figure 2)s, be used for supporting filter 11, it is abutted against on the wall 2.

Sieves 11 has in the inner effect that produces first chamber 17 of flexible filter with respect to the special placement of wall 2, and the volume in this chamber is important relatively, is used for the blood of receiving filtration.And compare with first chamber 17, the second chamber cumulative volume is little, and in fact, it is made of

several cell

18a, 18b, 18c, these cell horizontal positioned, and be connected with each other, as shown in Figure 3.The inlet opening 4 of blood is directly opened and is being positioned on the cell 18a of second chamber than top, and this cell is used to collect pending blood.

With reference to schematic figures 3, the filtering technique operating procedure is as follows again.Obviously, tractable flexible filtering pouch must at first be placed on a suitable interior (not shown) of instrument, links to each other with getter device and vacuum control unit.Polluted blood to be filtered (for example contain blood clotting, bone fragments, or the like) can 4 be drawn onto the cell 18a of second chamber than top through entering the mouth, and also is that the vacuum attraction effect that produces by instrument is supplied with.Blood flow is crossed sieves 11 to first chambeies 17, can be pumped into the outside through exporting 6 there.

At other form (not shown), in order further to reduce retention volume, by the granule that

several cell

18a, 18b that are connected with each other, reservation chamber that 18c constitutes can make with plastic material (PVC), for example diameter is about 3mm, partly or entirely filling easily, thus the pre-filtering effect produced.Opening on the sieves 11 is about for example 150 μ, and like this, the blood of pulpous state is before flowing through sieves 11, and it is very useful carrying out such pre-filtering.

Therefore, by with known flexible filtering pouch for example at patent EP0, type is compared described in 525,493, the shortcoming that bag of the present invention might be corrected same filter:

The sieves position is very near from wall, the retention volume of possible limit blood;

Thus, block up in case filter begins to become, the pressure reduction of filter both sides is with very fast increase, thereby it is logical that filter is relaxed, and therefore makes the operation of instrument have more reliability;

Because the weldering island has taken certain area, has increased maximum compression resistance, might reduce because the breaking of the filter that the local obstruction of filter causes;

Make relatively easy because all openings and add-on assemble (especially filter) all only are contained in two composition walls one;

At last, external drain has been avoided some shortcoming of internal drainage pipe.

Claims

1, be used to collect tractable flexible bag with processing blood, two inner chambers (17 are arranged, 18), separated by a sieves (11) each other, first chamber (17) links to each other with the outside by the outlet (6) of the blood that filters, and second chamber (18) inlet (4) by pending blood links to each other with the outside, the wall (1 that this bag made by two elastoplast, 2) form, a wall is placed above another, their peripheries (3) separately is welded together, it is characterized in that, inlet of blood (4) and outlet (6), and the outlet (5) that the suction air of biofilter is housed all is contained on the same wall (2) of this bag; Sieves (11) has the less surface area of more same wall (2), and with its inner surface combined effect, (18c), these cells are connected with each other and form said second chamber for 18a, 18b, and therefore, retention volume reduces to form several cells.

According to the flexible bag of claim 1, it is characterized in that 2, by means of the counterpart member (12) that plastic material is made, sieves (11) is linked on the inner surface of above-mentioned wall (2), this member becomes the extended opening (13) of a basic horizontal.

According to the flexible bag of claim 2, it is characterized in that 3, sieves (11) is linked on the above-mentioned wall (2), be to weld by the periphery between this wall and counterpart member (12), and the weldering island realizes, weldering island basic horizontal, and limit the cell (18a, 18b, 18c) that links to each other.

According to the flexible bag of claim 3, it is characterized in that 4, an opening on counterpart member (12) carries out the periphery welding, and biofilter is linked in the outlet (5) that sucks air.

5, according to the flexible bag one of in the claim 1 to 4, it is characterized in that, form the continuous cell (18a, 18b, 18c) in said second chamber, the grain packing that they are made with plastic material to small part.

According to the bag one of in the claim 1 to 5, it is characterized in that 6, it comprises that one exports (6) with blood and links to each other until the external drain (9) on the top of bag.