JP5799614B2 - Antifoaming material and manufacturing method thereof - Google Patents

Description

  The present invention relates to an antifoaming material used in cardiopulmonary surgery and the like and disposed in a cardiotomy section for filtering intracardiac blood, and a method for producing the same.

  When performing cardiac surgery or the like, an extracorporeal blood circulation circuit including a blood pump or an artificial lung for substituting the functions of a patient's heart and lungs is used. The extracorporeal blood circulation circuit temporarily stores venous blood removed from the patient's veins to adjust the blood volume of the circulation circuit (sometimes called a “venous blood reservoir”), A blood reservoir (sometimes referred to as “intracardiac blood reservoir”) is provided for aspirating, collecting, and temporarily storing blood (intracardiac blood) overflowing in the operative field. It is also widely performed to store venous blood and intracardiac blood in a common blood reservoir.

  Since intracardiac blood contains more foreign bodies and bubbles such as meat pieces, fat, and blood clots than venous blood, a blood reservoir that stores intracardiac blood has a filter to remove foreign bodies and bubbles are broken. The cardiotomy part which consists of a defoamer for making it do is provided.

  When the defoaming property of the defoaming material in the cardiotomy section is inferior, the bubbles increase (grow) so that bubbles rise on the blood surface. As a result, the atmospheric pressure in the cardiotomy section increases, and the inflow resistance of blood to the cardiotomy section increases.

  Patent Document 1 describes a cardiotomy section with improved defoaming characteristics, and its schematic configuration is shown in FIG.

  The cardiotomy section 300 includes a filter 310 having a bag shape as a whole (that is, a shape similar to a paper coffee filter used for coffee extraction), and an antifoaming material 320 disposed inside the filter 310. Is provided. The defoaming material 320 has a double portion 320D having a double structure composed of an outer layer 321 and an inner layer 322 on the upper side and a single portion 320S having a single structure composed of only the outer layer 321 on the lower side. It has a structure. A resin plate 360 is bonded to the upper end of the filter 310. A through hole 361 is formed in the approximate center of the resin plate 360. A conduit 390 is inserted into the through hole 361 from above. Intracardiac blood and chemicals flow into the cardiotomy section 300 through the conduit 390.

  The manufacturing method of the defoaming material 320 is demonstrated using FIG. 5A-FIG. 5D.

First, as shown in FIG. 5A, two defoaming material materials 200a and 200b having the same dimensions are prepared. The defoaming material 200a, 200b includes substantially rectangular main portions 201a, 201b and substantially rectangular sub-portions 202a ₁ , 202a ₂ provided on two opposite sides (short sides) of the main portions 201a, 201b, respectively; 202b ₁ , 202b ₂ and has a substantially “T” shape as a whole. As the antifoaming material 200a, 200b, for example, a material in which the surface of a foamed material such as polyurethane having a constant thickness and having an open cell is coated with an antifoaming material can be used.

Next, the antifoaming material 200a and the antifoaming material 200b are overlapped and joined by a method such as thermal welding in the regions 203a ₁ , 203b ₁ ; 203a ₂ , 203b ₂ with dot patterns.

  Thus, as shown in FIG. 5B, the defoamer material annular body 207 in which the two defoamer materials 200a and 200b are joined in an annular manner at the joints 205a and 205b is obtained.

Next, the antifoaming material annular body 207 is turned upside down in the direction of the arrow 208 to obtain an antifoaming material 320 shown in FIG. 5C. In the defoaming material 320, the defoaming material 200a is folded along the joints 205a and 205b so that the sub-portions 202a ₁ and 202a ₂ overlap the main portion 201a. Similarly, the defoaming material 200b is folded along the joints 205a and 205b so that the sub-parts 202b ₁ and 202b ₂ overlap the main part 201b. The main part 201a joined to the annular, auxiliary portions 202a ₁ on the inner side of the _{201b, 202a 2; 202b 1,} 202b 2 are arranged.

  Next, as shown in FIG. 5D, an antifoaming material 320 is inserted into the filter 310. Since the defoamer materials 200a and 200b have compressibility, the defoamer 320 is appropriately compressed and deformed and stored in the filter 310.

Thereafter, the cardiotomy section 300 shown in FIG. 4 is obtained by adhering the resin plate 360 to the upper end of the filter 310. In FIG. 4, the outer layer 321 is composed of main parts 201a and 201b, and the inner layer 322 is composed of sub parts 202a ₁ , 202a ₂ , 202b ₁ and 202b ₂ . A conduit 390 is inserted into the through hole 361 of the resin plate 360 from above.

  In FIG. 4, reference numeral 301 denotes a blood surface in a normal use state. Bubbles contained in the blood that has flowed into the cardiotomy section 100 from the opening at the lower end of the conduit 190 rise on the blood surface 301, and the number thereof increases with the passage of time and grows so as to gradually rise. However, most of the bubbles on the blood surface 301 come into contact with the lower end surface 321b of the outer layer 321 and break up. The slight bubbles may grow upward through the gap between the lower end surface 321b of the outer layer 321 and the conduit 390, but such bubbles may grow toward the inner peripheral surface 321a or the inner layer of the outer layer 321. The lower end surface 322b of the 322 is contacted and bubbles are broken. Therefore, the cardiotomy section 300 shown in FIG. 4 incorporating the anti-foaming material 320 having a half-duplex structure has excellent defoaming characteristics.

JP 2010-162208 A

  However, the defoaming material 320 of the cardiotomy section 300 in FIG. 4 has the following problems in the assembly process of inserting the conduit 390 from above into the through hole 361 of the resin plate 360.

First, there is a problem that the lower end of the conduit 390 inserted into the through hole 361 and moving downward is caught by the inner layer 322. As can be understood from FIGS. 5 and 5D, each of the sub-parts 202a ₁ , 202b ₁ , 202a ₂ , 202b ₂ constituting the inner layer 322 is supported by the joint part 205a or 205b only at one horizontal end thereof. Because of the cantilevered structure, the sub-part caught on the lower end of the conduit 390 is displaced downward together with the conduit 390. As a result, since the inner layer 322 is not formed at a desired position in the vertical direction, the defoaming characteristic of the cardiotomy section 300 is deteriorated.

  Second, the inner layer 322 collides with the lower end of the conduit 390 inserted into the through hole 361, and the opening at the lower end of the conduit 390 is blocked by the inner layer 322. As a result, the inflow resistance of blood and chemicals flowing in through the conduit 390 increases.

  These problems are particularly noticeable when the outer diameter of the conduit 190 is large.

  The present invention provides an antifoaming material having a half-duplex structure, which has excellent antifoaming properties and is less likely to cause a problem that the inner layer is displaced when the conduit is inserted or the inner layer blocks the opening of the conduit. The purpose is to provide.

The defoaming material of the present invention is a defoaming material built in the cardiotomy section, and includes an outer layer and an inner layer disposed inside the outer layer, and the inner layer is disposed only on the upper side. The upper end of the outer layer and the upper end of the inner layer are continuous through a thin portion.
In the first antifoaming material of the present invention, the antifoaming material has a bag shape having an upper side opened only.
In the second defoaming material of the present invention, the outer layer includes a pair of substantially trapezoidal main parts arranged so as to face each other, and the inner layer includes a pair of substantially trapezoidal sub-parts. .

  The method of manufacturing an antifoaming material of the present invention includes a pair of substantially trapezoidal main parts and a pair of substantially trapezoidal subparts, and the pair of main parts are continuous with each other with their first sides aligned. And a step of obtaining a defoamer material in which the pair of main parts are continuous with the pair of sub-parts via the second side, and the defoamer material along the second side. And the antifoaming material material is bent at the first side so that the pair of main parts overlap each other, and the pair of main parts are divided into the first side and the second side. A step of obtaining a defoaming material having a bag shape by joining two excluding sides, and the defoaming material at the second side so that the pair of sub-portions are positioned between the pair of main portions. Folding the material.

  Since the antifoaming material of the present invention has a half-duplex structure, it has excellent antifoaming properties.

  In addition, since the upper end of the outer layer and the upper end of the inner layer are continuous through the thin wall portion, the inner layer is misaligned when the conduit is inserted into the defoaming material, or the inner layer opens the opening of the conduit. The problem of blocking is less likely to occur.

FIG. 1 is a cross-sectional view showing a schematic configuration of a cardiotomy section according to an embodiment of the present invention. FIG. 2A is a view showing one step of a method for producing an antifoam material according to an embodiment of the present invention, and is a perspective view showing an antifoam material. FIG. 2B is a diagram showing one step of the method for producing an antifoam material according to one embodiment of the present invention, and shows an antifoam material having a thin portion formed between a main portion and a sub-portion. FIG. FIG. 2C is a diagram illustrating one step of the method for producing an antifoam material according to one embodiment of the present invention, and is a perspective view illustrating the antifoam material that is bent so that a pair of main parts overlap each other. It is. FIG. 2D is a front view of the defoaming material viewed along the arrow 2D in FIG. 2C. FIG. 2E is a view showing one step of a method for producing an antifoaming material according to an embodiment of the present invention, and a bag-shaped antifoaming material in which a pair of main parts are joined along both oblique sides thereof. It is the perspective view which showed. FIG. 2F is a view showing one step of the method for producing an antifoam material according to an embodiment of the present invention, and is a perspective view showing a bag-shaped antifoam material with the front and back turned upside down. FIG. 2G is a diagram showing a step of the method of manufacturing an antifoam material according to one embodiment of the present invention, and a bag-shaped eraser folded so that a pair of sub-portions are positioned between a pair of main portions. It is the perspective view which showed the foam material. FIG. 2H is a perspective view showing a state immediately before the defoaming material according to the embodiment of the present invention is inserted into the filter. FIG. 3 is a cross-sectional view showing a cardiotomy section according to an embodiment of the present invention in which a conduit is inserted. FIG. 4 is a cross-sectional view showing a schematic configuration of an example of a conventional cardiotomy section. FIG. 5A is a perspective view showing one step of a method of manufacturing a conventional antifoam material built in the cardiotomy section shown in FIG. FIG. 5B is a perspective view showing one step of a method for producing a conventional antifoaming material built in the cardiotomy section shown in FIG. 4. FIG. 5C is a perspective view showing one step of a method of manufacturing a conventional antifoaming material built in the cardiotomy section shown in FIG. FIG. 5D is a perspective view showing one step of a method of manufacturing a conventional antifoaming material built in the cardiotomy section shown in FIG.

  The defoaming material of the present invention is a defoaming material built in the cardiotomy section, and includes an outer layer and an inner layer disposed inside the outer layer, and the inner layer is disposed only on the upper side. The upper end of the outer layer and the upper end of the inner layer are continuous through a thin portion.

  It is preferable that the antifoaming material of the present invention has a bag shape in which only the upper side is opened. Accordingly, when blood containing bubbles is introduced into the antifoaming material through the upper opening, the bubbles are easily brought into contact with the antifoaming material, so that the antifoaming property is improved.

  The outer layer preferably includes a pair of substantially trapezoidal main parts disposed so as to face each other, and the inner layer preferably includes a pair of substantially trapezoidal sub-parts. Thereby, the design of an antifoamer can be simplified.

  The pair of main parts are preferably joined to each other at the other two sides so that one of the four sides is aligned with each other and is continuous with each other to form a bag shape. Thereby, the bag-shaped antifoamer similar to the paper coffee filter used in the case of coffee extraction can be obtained easily.

  The one side preferably forms the bottom of the bag shape. Thereby, since the bottom of the bag shape is made of a continuous antifoam material, blood can easily flow out of the defoamer. In addition, this makes it easier for the bubbles to come into contact with the defoaming material, thereby further improving the defoaming characteristics.

  The method of manufacturing an antifoaming material of the present invention includes a pair of substantially trapezoidal main parts and a pair of substantially trapezoidal subparts, and the pair of main parts are continuous with each other with their first sides aligned. And a step of obtaining a defoamer material in which the pair of main parts are continuous with the pair of sub-parts via the second side, and the defoamer material along the second side. And the antifoaming material material is bent at the first side so that the pair of main parts overlap each other, and the pair of main parts are divided into the first side and the second side. A step of obtaining a defoaming material having a bag shape by joining two excluding sides, and the defoaming material at the second side so that the pair of sub-portions are positioned between the pair of main portions. Folding the material.

  In the manufacturing method of the present invention, the second side is preferably the longer side of the two parallel sides of the main part. Thereby, an antifoamer with a large upper opening diameter can be obtained.

  It is preferable that the longer side of the two parallel sides of the sub part coincides with the second side. Thereby, a pair of sub part can be easily accommodated between a pair of main parts.

  The first side is preferably the shorter side of the two parallel sides of the main part. Thereby, the bag-shaped antifoamer similar to the paper coffee filter used in the case of coffee extraction can be obtained easily. Moreover, the defoamer which a pair of main part continued on the bag-shaped base can be obtained.

  The step of thinning the defoamer material is preferably performed by heating and fusing the defoamer material. Thereby, the process of thinning the defoamer material can be performed easily and quickly.

  The step of joining the pair of main parts at the two sides is preferably performed by heating and fusing the antifoam material. Thereby, the process of joining a pair of main parts can be performed easily and quickly.

  It is preferable that the method further includes a step of turning over the defoaming material having a bag shape before the step of folding the defoaming material on the second side. Thereby, an antifoamer with a large internal dimension between a pair of opposing main parts can be easily obtained.

  Below, this invention is demonstrated in detail, showing suitable embodiment. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the present invention can include arbitrary components not shown in the following drawings. In addition, the dimensions of the members in the following drawings do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of the members.

  FIG. 1 is a sectional view showing a schematic configuration of a cardiotomy section 1 according to an embodiment of the present invention.

  The cardiotomy section 1 includes a filter 10 having a bag shape as a whole, and an antifoaming material 20 disposed inside the filter 10.

  The filter 10 preferably has a function of capturing a foreign substance in blood when the blood passes through it, and more preferably has a function of capturing bubbles. There is no restriction | limiting in particular as the filter 10, For example, the well-known filter used for the conventional cardiotomy part, such as a screen filter (or mesh filter), a nonwoven fabric filter, can be used. In this embodiment, after forming a large number of pleats on a filter member having a three-layer structure in which mesh members are arranged on both sides of the screen filter, the filter described in Patent Document 1 formed in a bag shape is used.

  In the present embodiment, the filter 10 has a shape similar to a paper coffee filter used for coffee extraction, but the shape of the filter 10 of the present invention is not limited to this. Generally, it is preferable to have a bag shape in which only the upper side is opened.

  The defoaming material 20 has a bag shape as a whole with the upper side (resin plate 60 side) opened. The defoaming material 20 includes a bag-shaped outer layer 21 and an inner layer 22 disposed on the inner side of the outer layer 21, and has a half-duplex structure in which the inner layer 22 is disposed only on the upper side. Yes. That is, the defoaming material 20 has a double structure in which the outer layer 21 and the inner layer 22 are overlapped in the upper region in the vertical direction, the inner layer 22 does not exist in the lower region, and the outer layer It has a single structure composed of only the layer 21. The portion having the upper double structure is called “double portion 20D”, and the portion having the lower single structure is called “single portion 20S”. The double portion 20D does not have to have a double structure over the entire circumference. For example, a portion where the inner layer 22 does not exist may exist in a portion in the circumferential direction. The dimensional ratio in the vertical direction between the double part 20D and the single part 20S can be arbitrarily set.

  The upper end of the outer layer 21 and the upper end of the inner layer 22 are continuous via the thin portions 101a and 101b.

  The thicknesses of the outer layer 21 and the inner layer 22 may be the same or different. However, if they are the same, the outer layer 21 and the inner layer 22 are made from a raw material sheet having a certain thickness as described later, and a defoaming material 100 (defoaming material material 100 in FIG. 2A described later) having a predetermined shape. Since the antifoaming material 20 can be integrally formed by cutting out, the antifoaming material 20 can be manufactured efficiently.

  In the present embodiment, the defoaming material 20 has a shape similar to a paper coffee filter used for coffee extraction, but the shape of the defoaming material 20 of the present invention is not limited to this. Generally, it is preferable to have a bag shape in which only the upper side is opened.

  The material of the defoaming material 20 is not particularly limited as long as it has a function of breaking bubbles in contact with the material, and a known defoaming material used in a conventional cardiotomy section is arbitrarily selected and used. can do. For example, a material in which the surface of polyurethane as a base layer is coated with silicone as an antifoaming agent can be used. Moreover, as a form, the foam, woven fabric, knitted fabric, nonwoven fabric, etc. which have open cells can be used. The defoaming material 20 preferably has flexibility and flexibility.

  It is preferable that the lower end 20 b of the defoaming material 20 is spaced upward from the lowermost part (this is referred to as “inner bottom”) 10 b of the inner surface of the filter 10. As a result, the blood that has flowed into the antifoaming material 20 through the intracardiac blood conduit 91 (see FIG. 3 to be described later) immediately passes through the antifoaming material 20 without staying in the antifoaming material 20. 10 temporarily stays inside. When the blood passes through the defoaming material 20, some of the bubbles in the blood come into contact with the defoaming material 20 to break up bubbles, and the rest are separated from the blood and remain in the defoaming material 20. In this way, bubbles in the blood are separated from the blood by the antifoaming material 20, and blood hardly stays in the antifoaming material 20. As a result, the possibility that the bubbles come into contact with the defoaming material 20 is increased, so that the defoaming characteristics are improved. Since the defoaming property is good, it is possible to suppress an increase in the inflow resistance of blood and drug solution flowing into the cardiotomy section 1.

  A resin plate 60 is bonded to the upper end of the filter 10 and the upper end of the defoaming material 20. A through hole 61 is formed in the approximate center of the resin plate 60. A conduit 90 is inserted into the through-hole 61 from above (see FIG. 3 described later).

  The manufacturing method of the defoaming material 20 and the cardiotomy part 1 containing this is demonstrated below.

  First, as shown to FIG. 2A, the antifoam material 100 is produced. The defoaming material 100 includes a pair of main portions 110a and 110b having the same shape and a pair of sub portions 120a and 120b having the same shape and disposed therebetween.

  The main portion 110a has a substantially trapezoidal shape, and connects the lower base (first side) 111a and the upper base (second side) 112a (the lower base 111a is shorter than the upper base 112a) parallel to each other, and these end portions. It has hypotenuses 113a and 114a. Similarly, the main portion 110b also has a substantially trapezoidal shape, and is parallel to the lower base (first side) 111b and the upper base (second side) 112b (the lower base 111b is shorter than the upper base 112b), and the ends thereof. And hypotenuses 113b and 114b connecting the sections. The lower base 111a and the lower base 111b coincide, and the main part 110a and the main part 110b are continuous via the lower bases 111a and 111b.

  Each of the sub-parts 120a and 120b has a substantially trapezoidal shape. The upper base 122a, which is the longer of the pair of parallel sides of the sub-part 120a, coincides with the upper base 112a of the main part 110a, and the main part 110a and the sub-part 120a are connected via the upper bases 112a and 122a. It is continuous. Similarly, the upper base 122b, which is the longer one of the pair of parallel sides of the sub-part 120b, coincides with the upper base 112b of the main part 110b, and the main part 110b and the sub-parts via the upper bases 112b and 122b. 120b is continuous.

  The shape of the defoamer material 100 is line symmetric with respect to the lower bases 111a and 111b.

  The antifoaming material 100 can be prepared by cutting out a raw sheet made of polyurethane foam having a certain thickness, for example, into the above shape.

  Next, as shown in FIG. 2B, the thin portion 101a is formed along the upper bases 112a and 122a between the main portion 110a and the sub portion 120a. Similarly, the thin part 101b is formed along the upper bases 112b and 122b between the main part 110b and the sub part 120b. The thin-walled portions 101a and 101b are portions whose thickness is relatively reduced (that is, thinned) compared to other portions of the defoaming material 100. The method of forming the thin portions 101a and 101b can be arbitrarily selected according to the material of the antifoam material 100, etc., for example, by heating the antifoam material 100 with heat, high frequency, or ultrasonic waves. It is possible to use a method of heat-sealing by compressing while compressing, a method of compressing the antifoam material 100 by applying an adhesive, or a method of sewing with a thread or the like. This method is preferable because it can be carried out easily. In FIG. 2B, the defoamer material 100 is heated and compressed by pressing a heated straight iron against one surface (the upper surface of FIG. 2B) of the defoamer material 100 placed on a flat plate. Thin portions 101a and 101b are formed by heat fusion.

  Next, as shown in FIG. 2C, the antifoam material 100 is bent along the lower bases 111a and 111b. FIG. 2D is a front view of the defoaming material 100 as viewed along the arrow 2D in FIG. 2C. As described above, since the defoaming material 100 is symmetric with respect to the lower bases 111a and 111b, the pair of main parts 110a and 110b overlap each other, and the pair of sub parts 120a and 120b overlap each other. In this state, the main portions 110a and 110b are joined at the hypotenuse 113a and the hypotenuse 113b, and at the hypotenuse 114a and the hypotenuse 114b. In FIG. 2C and FIG. 2D, the areas 115a and 115b with the dot pattern indicate the areas to be joined. The joining method is not particularly limited and can be arbitrarily selected according to the material of the defoaming material 100, for example, while heating the defoaming material 100 with heat, high frequency, or ultrasonic waves, for example. Use the same method as the formation of the thin-walled portions 101a, 101b, such as a method of heat-sealing by compression, a method of compressing the antifoam material 100 by applying an adhesive, or a method of sewing with a thread or the like. Can do. Among these, the heat fusion method is preferable because it can be easily carried out.

  Thus, as shown in FIG. 2E, the defoamer material 100 having a bag shape in which the pair of main portions 110a and 110b are joined by the joining portions 102a and 102b is obtained. In FIG. 2E, the pair of main parts 110a and 110b that are overlapped are sandwiched between a pair of heated straight irons, and the iron is pressed against the main parts 110a and 110b to be heat-compressed and heat-sealed. Thus, the joint portions 102a and 102b are formed. The surface on which the trowel is pressed to form the joint portions 102a and 102b and the surface on which the trowel is pressed to form the thin portions 101a and 101b are on the same side of the defoaming material 100 This is the aspect.

  Next, the bag-shaped defoamer material 100 is turned upside down in the direction of arrow 103 in FIG. 2E to obtain the bag-shaped defoamer material 100 shown in FIG. 2F. By turning over the bag-shaped antifoam material 100, the space between the main parts 110a and 110b is expanded by the elastic force of the antifoam material 100.

  Next, in FIG. 2F, the defoamer material 100 is folded back in the direction of the arrow 1104 along the thin portions 101a and 101b so that the pair of sub-portions 120a and 120b are positioned between the pair of main portions 110a and 110b. Thus, as shown in FIG. 2G, an antifoaming material 20 having a half-duplex structure and having only an upper side opened is obtained. Since the defoamer material 100 is relatively thin in the thin portions 101a and 101b, the folding position of the defoamer material 100 is determined by the thin portions 101a and 101b, and the defoamer material 100 is changed to the thin portions 101a and 101b. Can be easily folded along. Further, the radius of curvature of the outer surface of the folded portion where the defoaming material 100 is folded along the thin portions 101a and 101b (that is, the opening edge of the defoaming material 20) forms the thin portions 101a and 101b. It becomes smaller compared with the case where it is folded back. Since the sub portions 120a and 120b have a substantially trapezoidal shape, the sub portions 120a and 120b can be easily accommodated between the main portions 110a and 110b. Since the thin-walled portions 101a and 101b are formed in the folded portion of the defoamer material 100, the folded defoamer material 100 is elastically recovered and the sub-portion stored between the pair of main portions 110a and 110b. The portions 120a and 120b can be prevented from jumping out from between the main portions 110a and 110b.

  Next, as shown in FIG. 2H, the filter 10 and the defoaming material 20 are arranged so that the respective openings face upward, and the defoaming material 20 is inserted into the filter 10. In general, since the antifoam material 100 has compressibility, the defoamer 20 can be appropriately elastically deformed by compression and stored in the filter 10.

  Thereafter, the resin plate 60 is bonded to the upper end of the filter 10 and the upper end of the defoaming material 20 (that is, the thin portions 101a and 101b). The material of the resin plate 60 is not particularly limited, but for example, an adhesive such as polyurethane can be used. By providing the resin plate 60, the shape retention characteristics of the filter 10 and the defoaming material 20 are improved. The resin plate 60 is formed with a through hole 61 through which blood flows. In the present embodiment, the planar shape of the resin plate 60 is an oval shape (that is, a track (track) shape of an athletic stadium), but is not limited thereto, and an arbitrary shape such as an oval shape, a circular shape, or a rectangular shape can be selected. .

  Thus, the cardiotomy section 1 shown in FIG. 1 is obtained. As can be easily understood from the manufacturing method of the defoaming material 20 described above, the outer layer 21 of the defoaming material 20 is composed of a pair of main parts 110a and 110b, and the inner layer 22 is a pair of sub-parts 120a and 120b. Consists of. The lower end 20b of the defoaming material 20 includes a pair of lower bases 111a and 111b.

  By making the filter 10 deeper than the vertical dimension of the defoaming material 20, the lower end 20 b of the defoaming material 20 can be spaced upward from the inner bottom 10 b of the filter 10 as shown in FIG. 1.

  In the manufacturing method of said antifoam material 20, you may coat the antifoamer, such as silicone, on the surface of the antifoam material 20 as needed. The coating process may be performed at any stage. For example, in any stage of FIGS. 2E, 2F, and 2G, that is, after the antifoam material 100 is formed into a bag shape, It is preferably performed at any stage prior to insertion.

  The method for producing the defoaming material 20 is merely an example, and the defoaming material 20 of the present invention can of course be produced by a method other than the above method.

  For example, the bag-shaped defoaming material 100 obtained in FIG. 2E may be stored in the filter 10 without turning the front and back.

  The operation of the defoaming material 20 of the present invention configured as described above will be described.

  FIG. 3 is a cross-sectional view showing a state where the conduit 90 is inserted into the through hole 61 of the resin plate 60 of the cardiotomy section 1 of the present embodiment shown in FIG. FIG. 3 also shows a lid 36 of a blood reservoir (not shown) in which the cardiotomy section 1 is built.

  The conduit 90 includes an intracardiac blood conduit 91 for allowing intracardiac blood to flow into the cardiotomy section 1, and a medicinal solution conduit 92 for allowing a chemical liquid or the like to flow into the cardiotomy section 1. The intracardiac blood conduit 91 communicates with the intracardiac blood flow inlet port 50 provided on the upper surface of the lid body 36, and the medicinal solution conduit 92 communicates with the medicinal fluid injection port 72 provided on the upper surface of the lid body 36. ing.

  In order to prevent the pressure fluctuations generated when the intracardiac blood and the drug solution flow into the cardiotomy section 1 from affecting the inflow of each other, the intracardiac blood conduit 91 and the drug solution conduit 92 are The separation walls 93 are separated from each other. As a result, the outer diameter of the conduit 90 is increased, and the upper portion of the defoaming material 20 is compressed and deformed by the thick conduit 90.

  In the present invention, as can be easily understood from the manufacturing method of the defoaming material 20 described above, the double layer composed of the outer layer 21 and the inner layer 22 is formed by folding the continuous defoaming material 100 at the thin portions 101a and 101b. Part 20D is formed. That is, the upper end of the outer layer 21 and the upper end of the inner layer 22 are continuous via the thin portions 101a and 101b (see FIG. 1). In addition, the thickness of the defoaming material 100 is reduced in the thin portions 101a and 101b. Therefore, the outer dimension of the defoaming material 20 (or the radius of curvature of the outer surface of the defoaming material 20) at the folded portion of the defoaming material 20 at the thin wall portions 101a and 101b is small. As a result, when the thick conduit 90 is inserted from above into the through hole 61 of the resin plate 60 of the cardiotomy section 1 shown in FIG. Thereby, in the assembly process which inserts the conduit | pipe 90 in the cardiotomy part 1 which incorporated the antifoamer 20, the position shift of the inner side layer 22 does not arise easily. Accordingly, the problem of the cardiotomy section 300 including the conventional defoaming material 320 shown in FIG. 4 that the defoaming characteristics deteriorate due to the displacement of the inner layer 22 is solved.

  In the present embodiment, the defoamer 20 is bonded to the resin plate 60 in the thin portions 101a and 101b. Thereby, even if the lower end of the conduit 90 inserted from above into the through hole 61 of the resin plate 60 is caught by the inner layer 22, the inner layer 22 is more reliably prevented from being displaced downward together with the conduit 90. Can do.

  Further, since the outer dimension of the defoaming material 20 at the folded portion of the defoaming material 20 (or the radius of curvature of the outer surface of the defoaming material 20) is small and the inner layer 22 is not easily displaced, the inner layer 22 Does not block the opening at the lower end of the conduit 90. Accordingly, the cardio incorporating the conventional antifoaming material 320 shown in FIG. 4 increases the resistance of the blood or chemical solution flowing in through the conduit 190 when the opening at the lower end of the conduit 190 is blocked by the inner layer 122. The problem that the Tommy unit 300 has is solved.

  Moreover, since the defoaming material 20 of the present invention has a half-duplex structure like the conventional defoaming material 320 shown in FIG. 4, the cardiotomy section 1 incorporating the defoaming material 20 of the present invention. Has excellent antifoaming properties. Furthermore, since the defoaming material 20 of the present invention has a bag shape in which only the upper side is opened, there is a possibility that bubbles may come into contact with the defoaming material 20 as compared with the defoaming material 320 in which the upper side and the lower side are opened. Becomes higher. As a result, the defoaming characteristics are further improved.

  The above-described embodiment is an example, and the present invention is not limited to this, and various modifications are possible.

  In said embodiment, although the antifoamer 20 had the bag shape which only the upper side opened, the shape of the antifoamer 20 is not limited to this. For example, you may have the substantially cylindrical shape which the upper side and the lower side opened. However, the bag shape with the lower side closed as in the above embodiment is advantageous with respect to the defoaming property.

  In the defoaming material 100 described above, the pair of substantially trapezoidal main portions 110a and 110b are continuous with the lower base 111a and the lower base 111b aligned, but the present invention is not limited to this. For example, the pair of main portions 110a and 110b may be continuous such that the hypotenuse 113a and the hypotenuse 113b or the hypotenuse 114a and the hypotenuse 114b coincide with each other. In this case, the defoaming material 100 can be bent along one of the matched hypotenuses and joined to the lower bases 111a and 111b and the other hypotenuse to form a bag shape.

  The filter 10 constituting the cardiotomy section 1 is not limited to the filter formed in the bag shape by pleating the filter member having the three-layer laminated structure including the screen filter shown in the above embodiment. For example, a filter formed into a bag shape without pleating a nonwoven fabric may be used.

  In the cardiotomy section 1 described above, the defoaming material 20 is bonded and held on the resin plate 60, but the method of holding the defoaming material 20 is not limited to this. For example, the defoamer 20 may be held by a jig provided at the lower end of the defoamer 20 so that the defoamer 20 does not descend with respect to the filter 10. In the defoaming material 20 of the present invention, since the inner layer 22 is folded back inside the outer layer 21 at the thin-walled portions 101 a and 101 b at the upper end, the upper end of the defoaming material 20 is bonded to the resin plate 60. Even if it is not made, the positional deviation of the inner layer 22 hardly occurs.

  The configuration of the blood reservoir containing the cardiotomy section 1 including the defoaming material 20 of the present invention is not particularly limited, and can be appropriately selected from, for example, known blood reservoirs. The blood reservoir is not limited to an intracardiac blood reservoir integrated venous blood reservoir into which venous blood and intracardiac blood flow, and may be, for example, an intracardiac blood reservoir into which venous blood does not flow.

  The present invention can be widely used as an antifoaming material disposed in a cardiotomy section built in a blood reservoir provided in an extracorporeal blood circulation circuit used when performing cardiopulmonary surgery or the like.

DESCRIPTION OF SYMBOLS 1 Cardiotomy part 10 Filter 20 Defoamer 20D Double part 20S Single part 21 Outer layer 22 Inner layer 60 Resin board 61 Through-hole 90 formed in resin board Conduit 100 Antifoam material 101a, 101b Thin part 110a, 110b Main parts 111a, 111b Lower base (first side) of main parts
112a, 112b Top bottom of main part (second side)
120a, 120b sub part

Claims (12)

An antifoaming material built into the cardiotomy section,
The defoaming material has a bag shape having an opening only on the upper side, includes an outer layer and an inner layer disposed on the inner side of the outer layer, and the half layer structure in which the inner layer is disposed only on the upper side. Have
An antifoaming material, wherein an upper end of the outer layer and an upper end of the inner layer are continuous through a thin portion. The outer layer includes a pair of substantially trapezoidal main portions arranged to face each other,
The antifoaming material according to claim 1 , wherein the inner layer includes a pair of substantially trapezoidal sub-parts. An antifoaming material built into the cardiotomy section,
An outer layer and an inner layer disposed inside the outer layer, the inner layer having a half-duplex structure disposed only on the upper side;
The upper end of the outer layer and the upper end of the inner layer are continuous through a thin portion,
The outer layer includes a pair of substantially trapezoidal main portions arranged to face each other,
The defoaming material, wherein the inner layer includes a pair of substantially trapezoidal sub-parts. 4. The defoaming according to claim 2, wherein the pair of main parts are joined to each other at the other two sides so that one side of the four sides coincides and is continuous with each other so as to form a bag shape. Wood.   The defoaming material according to claim 4, wherein the one side forms the bottom of the bag shape. A pair of substantially trapezoidal main parts and a pair of substantially trapezoidal sub-parts, the pair of main parts being continuous with each other with their first sides aligned, and the pair of main parts being Obtaining a defoamer material that is continuous with the pair of sub-parts through two sides, and
Thinning the antifoam material along the second side;
The defoaming material is folded at the first side so that the pair of main parts overlap each other, and the pair of main parts are joined at two sides excluding the first side and the second side. Obtaining an antifoam material having a bag shape;
And a step of folding back the antifoam material on the second side so that the pair of sub-portions are positioned between the pair of main portions.   The method for producing an antifoaming material according to claim 6, wherein the second side is a longer side of the two parallel sides of the main part.   The method for producing an antifoaming material according to claim 6 or 7, wherein the longer side of the two parallel sides of the sub part coincides with the second side.   The method for producing a defoaming material according to any one of claims 6 to 8, wherein the first side is a shorter side of two parallel sides of the main part.   The method for producing an antifoam material according to any one of claims 6 to 9, wherein the step of thinning the defoamer material is performed by heating and fusing the defoamer material.   The method for producing an antifoam material according to any one of claims 6 to 10, wherein the step of joining the pair of main parts at the two sides is performed by heating and fusing the antifoam material.   The manufacturing of the defoamer according to any one of claims 6 to 11, further comprising a step of turning over the defoamer material having a bag shape before the step of folding the defoamer material on the second side. Method.

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