JP2014183948A - Defoamer, manufacturing method therefor, and blood storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defoamer for a blood storage tank of an artificial lung that is manufactured easily.SOLUTION: A defoamer 20 includes a bag-shaped outer layer 21 whose upper side only is open, including main parts 110a and 110b opposed to each other, and an inner layer 22 arranged between a pair of the main parts, including a pair of sub parts 120a and 120b overlapped on the pair of the main parts respectively, and is made of a continuous single sheet material. Slits are formed between edges on the respective upper sides of the main parts and the sub parts that are mutually overlapped. The edges on the respective upper sides of the main parts and the sub parts that are mutually overlapped are continuous in the portion except the slits.

Description

  The present invention relates to an antifoaming material used in cardiopulmonary surgery or the like and disposed in a cardiotomy section for filtering blood, and a method for producing the same. Moreover, this invention relates to the blood reservoir provided with the cardiotomy part which incorporated the said antifoamer.

  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 called "intracardiac blood reservoir") is provided for aspirating, collecting, and temporarily storing blood (sometimes called "intracardiac blood") that overflows the operative field It is done. It is widely performed to store venous blood and intracardiac blood in a common blood reservoir (sometimes referred to as “intracardiac blood reservoir-integrated venous blood reservoir”).

  The blood flowing into the blood reservoir often contains foreign matters such as meat pieces, fat, and blood clots, and bubbles. Accordingly, the blood reservoir may be provided with a cardiotomy section composed of a filter for removing foreign substances in the blood and an antifoaming material for defoaming (breaking) bubbles.

  In the cardiotomy section, air bubbles mixed in the blood float on the blood surface. As time passes, the number of bubbles on the blood surface increases, and the bubbles rise upward on the blood surface.

  Patent Documents 1 and 2 describe a cardiotomy section provided with an anti-foaming material having a half-duplex structure including an outer layer and an inner layer disposed only on the upper side inside the outer layer. Since the bubbles grown so as to swell upward on the blood surface come into contact with the lower end surface of the inner layer, the cardiotomy section has a good defoaming property.

JP 2013-13597 A JP2013-13598A

  The antifoaming materials described in Patent Documents 1 and 2 are generally produced as follows. First, a continuous sheet material including a pair of main parts having a substantially trapezoidal shape serving as an outer layer and a pair of sub-parts having a substantially trapezoidal shape serving as an inner layer is prepared. Next, two thin portions are formed by thermal fusion or the like along the boundary between the adjacent main and sub portions. Next, the sheet material is folded in two along the boundary between the pair of main portions, and the pair of main portions overlapped with each other is joined at both sides to form a bag. Next, the pair of sub-parts are folded back along the thin-walled part so that the pair of sub-parts are disposed between the pair of main parts. Since the thin part is formed between the main part and the sub part, the folding position of the sheet material is demarcated and the folding of the sheet material is easy.

  However, in the manufacturing method of the defoaming material described above, it is necessary to perform processing such as heat sealing on the sheet material twice in order to form two thin portions. This complicates the production of the defoaming material and leads to an increase in the cost of the defoaming material.

  An object of the present invention is to solve the problems of the conventional antifoaming material and provide an antifoaming material that is easy to manufacture. Another object of the present invention is to provide an inexpensive blood reservoir equipped with such an antifoaming material.

  The antifoaming material of the present invention is composed of a single continuous sheet material, includes a pair of main parts facing each other, and is disposed between the outer layer having a bag shape with only the upper side opened and the pair of main parts. And an inner layer including a pair of sub-portions superimposed on the pair of main portions. A slit is formed between the upper edge of each of the main part and the sub part that overlap each other. The upper edge of each of the main portion and the sub-portion overlapping each other is continuous at a portion excluding the slit.

  The method for producing an antifoam material of the present invention includes a step of preparing a continuous single sheet material including a pair of main portions and a pair of sub-portions arranged so as to sandwich the pair of main portions, Forming a slit along the boundary between the main portion and the sub-portion, and along the boundary between the pair of main portions so that the pair of main portions overlap each other and the pair of sub-portions overlap each other Bending the sheet material and joining the pair of main portions along an edge thereof so as to have a bag shape with only the pair of sub portions opened; and the pair of sub portions is the pair of main portions. Folding the pair of sub-parts along a boundary between the main part and the sub-part so as to be disposed between the parts.

  The blood reservoir of the present invention includes a cardiotomy section, and the cardiotomy section contains the antifoaming material of the present invention described above.

  According to the present invention, the slit is formed between the main part and the sub part, and the main part and the sub part are continuous in the portion excluding the slit. For this reason, in the part in which the slit was formed, the mechanical strength of the sheet | seat material which comprises an antifoamer is relatively weak. Therefore, when the sub part is folded back so as to overlap the main part, the folding position is defined at the position where the slit is formed, so that the sheet material can be easily folded. In addition, the formation of the slit is easier than the conventional formation of the thin portion. Therefore, the antifoaming material of the present invention is easy to manufacture, which is advantageous for cost reduction.

  Since the blood reservoir of the present invention includes the antifoaming material of the present invention, it is easy to manufacture and inexpensive.

FIG. 1A is a perspective view of an antifoaming material according to Embodiment 1 of the present invention. 1B is a cross-sectional view of the antifoaming material shown in FIG. 1A. FIG. 2A is a diagram showing one step of the method for producing the defoaming material according to Embodiment 1 of the present invention, and is a perspective view of the sheet material used for producing the defoaming material. FIG. 2B is a diagram illustrating one step of the method for producing the antifoam material according to Embodiment 1 of the present invention, and is a plan view of the sheet material in which slits are formed along the boundary between the main part and the sub part. . FIG. 2C is a diagram illustrating one step of the method of manufacturing the antifoam material according to Embodiment 1 of the present invention, and is a perspective view of the sheet material that is bent so that a pair of main parts overlap each other. FIG. 2D is a front view of the sheet material viewed along the arrow 2D in FIG. 2C. FIG. 2E is a diagram illustrating a step of the method for producing the antifoam material according to Embodiment 1 of the present invention, and a perspective view of a bag-shaped sheet material in which a pair of main parts are joined along both oblique sides thereof. It is. FIG. 2F is a diagram showing one step of the method for producing the antifoam material according to Embodiment 1 of the present invention, and is a perspective view of a bag-shaped sheet material that is turned upside down. FIG. 3 is a perspective view showing a schematic configuration of the blood reservoir according to Embodiment 1 of the present invention. FIG. 4 is a side sectional view of the blood reservoir according to Embodiment 1 of the present invention. FIG. 5A is a plan view of a sheet material used for producing an antifoaming material according to Embodiment 2 of the present invention. FIG. 5B is a plan view of another sheet material used for manufacturing the antifoaming material according to Embodiment 2 of the present invention. FIG. 6 is a plan view of a sheet material used for manufacturing the defoaming material according to Embodiment 3 of the present invention.

  The antifoaming material of the present invention is composed of a single continuous sheet material, includes a pair of main parts facing each other, and is disposed between the outer layer having a bag shape with only the upper side opened and the pair of main parts. And an inner layer including a pair of sub-portions superimposed on the pair of main portions. A slit is formed between the upper edge of each of the main part and the sub part that overlap each other. The upper edge of each of the main portion and the sub-portion overlapping each other is continuous at a portion excluding the slit.

  In the defoaming material of the present invention, the slit may be formed at a plurality of locations including at least both ends of the upper edge of the sub part. Thereby, the both ends of the sub part are separated from the main part. This is advantageous for facilitating the operation of storing the sub part between the pair of main parts.

  The upper edge of the sub part may be shorter than the upper edge of the main part. This is advantageous for storing the sub-part easily and nicely between the pair of main parts.

  The main portion may have a substantially trapezoidal shape. In this case, it is preferable that the upper edge of the main portion is a longer side of two substantially parallel sides of the substantially trapezoidal shape of the main portion. The sub-portion may have a substantially trapezoidal shape. In this case, it is preferable that the upper edge of the sub part is a longer side of two substantially parallel sides of the substantially trapezoidal shape of the sub part. Thereby, it is possible to easily obtain a bag-shaped antifoaming material having a large upper opening diameter, which is similar to a paper coffee filter used for coffee extraction.

  The method for producing an antifoam material of the present invention includes a step of preparing a continuous single sheet material including a pair of main portions and a pair of sub-portions arranged so as to sandwich the pair of main portions, Forming a slit along the boundary between the main portion and the sub-portion, and along the boundary between the pair of main portions so that the pair of main portions overlap each other and the pair of sub-portions overlap each other Bending the sheet material and joining the pair of main portions along an edge thereof so as to have a bag shape with only the pair of sub portions opened; and the pair of sub portions is the pair of main portions. Folding the pair of sub-parts along a boundary between the main part and the sub-part so as to be disposed between the parts.

  In the manufacturing method of the defoaming material of the present invention, the slits may be formed at a plurality of locations including at least both ends of the boundary between the main portion and the sub portion. Thereby, the both ends of the sub part are separated from the main part. This is advantageous for facilitating the operation of storing the sub part between the pair of main parts.

  The dimension of the sub part along the boundary between the main part and the sub part may be shorter than the dimension of the main part along the boundary between the main part and the sub part. This is advantageous for storing the sub-part easily and nicely between the pair of main parts.

  The main portion may have a substantially trapezoidal shape. In this case, it is preferable that the pair of main portions are continuous to each other with the shorter side of the substantially trapezoidal two sides substantially parallel to each other being matched. The sub-portion may have a substantially trapezoidal shape. In this case, the longer side of the substantially trapezoidal shape of the sub-portion of the substantially trapezoidal shape is set to the longer side of the substantially trapezoidal shape of the main portion of the substantially parallel-shaped side. It is preferable that the main part and the sub part are continuous with each other. Thereby, it is possible to easily obtain a bag-shaped antifoaming material having a large upper opening diameter, which is similar to a paper coffee filter used for coffee extraction. In addition, blood outflow from the lower end of the bag-shaped antifoaming material is facilitated, so that the amount of blood remaining in the antifoaming material can be reduced.

  Before the step of folding back the pair of sub-parts along the boundary between the main part and the sub-part, the method further comprises the step of turning over the sheet material joined to the pair of main parts so as to have a bag shape. May be. Thereby, the defoamer with a large internal dimension between a pair of opposing main parts can be obtained easily. This is advantageous for producing a bag-shaped antifoaming material having an opening on the upper side in a natural state where no external force acts.

  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 members constituting the embodiment of the present invention. Therefore, the present invention can include any member not shown in the following drawings. Further, in the following drawings, the actual dimensions of members and the dimensional ratios of the members are not faithfully represented.

<Embodiment 1>
(Defoamer)
FIG. 1A is a perspective view of an antifoaming material 20 according to Embodiment 1 of the present invention. FIG. 1B is a cross-sectional view of the defoaming material 20 shown in FIG. 1A. In the following description, “upper”, “lower”, and “horizontal direction” are defined based on the actual use state of the antifoaming material 20.

  The defoaming material 20 is made of a single sheet material, and has a bag shape as a whole with the upper side opened. The defoaming material 20 includes an outer layer 21 having a bag shape whose upper side is open, and an inner layer 22 disposed on the inner side of the outer layer 21, and the half layer in which the inner layer 22 is disposed only on the upper side. It has a structure. 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 need to have a double structure over the entire circumference, and for example, a portion where the inner layer 22 does not exist may exist in a part of 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 outer layer 21 includes a pair of main portions 110a and 110b that face each other. Each of the pair of main portions 110a and 110b has a substantially trapezoidal shape. Of the two substantially parallel sides of the substantially trapezoidal shapes of the main portions 110a and 110b, the upper edges (upper bases) 112a and 112b are the lower edges (lower bases) 111a and 111b (see FIG. 2A described later). Longer. The main part 110a and the main part 110b are connected to each other with their lower end edges (lower bases) 111a and 111b being matched. A pair of sides (slanted sides) 113a and 114a (see FIG. 2A described later) facing the horizontal direction of the main part 110a and a pair of sides (slope sides) 113a and 114a (see FIG. 2A described later) facing the horizontal direction of the main part 110b. ) And are joined.

  The inner layer 22 includes a pair of sub-parts 120a and 120b disposed between the pair of main parts 110a and 110b. Each of the pair of sub-parts 120a and 120b has a substantially trapezoidal shape. Of the substantially trapezoidal shapes of the sub-parts 120a and 120b, the upper end edges (upper bases) 122a and 122b of the substantially parallel sides are the lower end edges (lower bases) 121a and 121b (see FIG. 2A described later). Longer.

  The main part 110a and the sub part 120a overlap each other. Between the upper base 112a of the main part 110a and the upper base 122a of the sub part 120a, two slits 117a (see FIG. 2B described later) formed from both ends of the upper base 122a are formed. The upper base 112a of the main part 110a and the upper base 122a of the sub part 120a are continuous at the part 101a excluding the slit 117a.

  The main part 110b and the sub part 120b overlap each other. Two slits 117b (see FIG. 2B described later) formed from both ends of the upper base 122b are formed between the upper base 112b of the main part 110b and the upper base 122b of the sub part 120b. The upper base 112b of the main part 110b and the upper base 122b of the sub part 120b are continuous at the part 101b excluding the slit 117b.

  The upper bases 112a and 112b of the main parts 110a and 110b are longer than the upper bases 122a and 122b of the sub parts 120a and 120b.

  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 cut out from a sheet material 100 having a predetermined thickness (see FIGS. 2A and 2B to be described later) as a defoaming material, as described later. Since 20 can be produced integrally, the antifoaming material 20 can be manufactured efficiently.

  In the first 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. . However, it is preferable that the horizontal dimension of the upper base has a substantially trapezoidal shape larger than the horizontal dimension of the lower base when viewed along the direction orthogonal to the main portions 110a and 110b.

  As a material of the defoaming material 20, it is preferable to have a defoaming function that breaks bubbles in contact with the defoaming material 20, and flexibility that can be easily deformed by applying an external force. And it is preferable to have a softness | flexibility and the cushioning property (shape resettability) which returns to an initial shape when the said external force is removed. As the defoaming material 20, a known material can be used as the defoaming material provided in the blood reservoir or the cardiotomy section. 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. Further, the form of the base layer may be a sheet-like material such as foam, woven fabric, knitted fabric, and nonwoven fabric having open cells. Preferably, a material in which a sheet-like flexible polyurethane foam is coated with silicone can be used.

  The manufacturing method of the defoaming material 20 is demonstrated below.

  First, a continuous single sheet material 100 shown in FIG. 2A is created. The sheet 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 part 110a has a substantially trapezoidal shape, and a lower base 111a and an upper base 112a (the lower base 111a is shorter than the upper base 112a), which are substantially parallel to each other, and a hypotenuse 113a connecting the ends of the lower base 111a and the upper base 112a, 114a. Similarly, the main part 110b also has a substantially trapezoidal shape, and connects the lower base 111b and the upper base 112b (the lower base 111b is shorter than the upper base 112b), which are substantially parallel to each other, and the ends of the lower base 111b and the upper base 112b. It has hypotenuses 113b and 114b. 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 one of the pair of sides 121a and 122a substantially parallel to each other of the sub-part 120a coincides with the upper base 112a of the main part 110a and is connected to the main part 110a via the upper bases 112a and 122a. The part 120a is continuous. The upper base 122a of the sub part 120a is shorter than the upper base 112a of the main part 110a. Similarly, the upper base 122b, which is the longer one of the pair of substantially parallel sides 121b and 122b of the sub-part 120b, coincides with the upper base 112b of the main part 110b, and is connected to the main part via the upper bases 112b and 122b. 110b and the sub-portion 120b are continuous. The upper base 122b of the sub part 120b is shorter than the upper base 112b of the main part 110b.

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

  For example, the sheet material 100 can be formed by cutting an original fabric sheet (for example, a sheet of soft polyurethane foam) having a certain thickness into the above shape.

  Next, as shown in FIG. 2B, a pair of slits (cuts) 117a having substantially the same length are formed along the upper base 122a from both ends of the upper base 122a of the sub-part 120a. As a result, the main portion 110a and the sub portion 120a are continuous through the portion 101a where the slit 117a is not formed in the upper base 122a. Similarly, a pair of slits (cuts) 117b having substantially the same length is formed along the upper base 122b from both ends of the upper base 122b of the sub part 120b. As a result, the main portion 110b and the sub-portion 120b are continuous through the portion 101b of the upper base 122b where the slit 117b is not formed. The slit 117a and the slit 117b have substantially the same length. The slits 117a and 117b shown in FIG. 2B may be formed simultaneously with the formation of the sheet material 100 shown in FIG. 2A.

  Next, as shown in FIG. 2C, the sheet material 100 is bent along the lower bases 111a and 111b. 2D is a front view of the sheet material 100 viewed along the arrow 2D in FIG. 2C. As described above, since the sheet material 100 is symmetrical with respect to the lower bases 111a and 111b, the pair of main portions 110a and 110b overlap each other, and the pair of sub portions 120a and 120b overlap each other. In this state, the main portion 110a and the main portion 110b are joined at the hypotenuse 113a and the hypotenuse 113b, and at the hypotenuse 114a and the hypotenuse 114b (see FIG. 2A). 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 depending on the material of the sheet material 100. For example, the sheet material 100 is heated and compressed by heating, high frequency, or ultrasonic waves, for example. A method of attaching, a method of compressing the sheet material 100 by applying an adhesive, or a method of sewing with a thread or the like can be used. Among these, the heat fusion method is preferable because it can be easily carried out.

  Thus, as shown in FIG. 2E, a sheet material 100 is obtained in which the pair of main portions 110a and 110b are joined at the joining portions 102a and 102b. The sheet material 100 shown in FIG. 2E has a bag shape in which only the sub-parts 120a and 120b side (upper bottoms 112a and 112b side) are opened. In FIG. 2E, the joining planned regions 115a and 115b (see FIGS. 2C and 2D) of the paired main portions 110a and 110b are sandwiched between a pair of heated linear irons and heated and compressed. The joint portions 102a and 102b are formed by heat fusion.

  Next, the bag-shaped sheet material 100 shown in FIG. 2F is obtained by turning the front and back of the bag-shaped sheet material 100 in the direction of the arrow 103 in FIG. 2E. In the sheet material 100 of FIG. 2F turned upside down, the interval between the main portions 110a and 110b is expanded by the elastic force of the sheet material 100.

  Next, in FIG. 2F, the sheet material 100 is folded back in the direction of the arrow 104 so that the pair of sub-parts 120a and 120b are positioned between the pair of main parts 110a and 110b. Thus, an antifoaming material 20 having a half-duplex structure and having only an upper side opened as shown in FIGS. 1A and 1B is obtained. As can be easily understood from the above manufacturing method, the outer layer 21 of the defoaming material 20 is composed of a pair of main portions 110a and 110b, and the inner layer 22 is composed of a pair of sub portions 120a and 120b.

  As described above, in the manufacturing method of the defoaming material 20 of the first embodiment, the slits 117a and 117b are formed along the upper bases 122a and 122b of the sub-parts 120a and 120b (see FIG. 2B). Thereby, the mechanical strength of the sheet material 100 becomes relatively weak at the upper bases 122a and 122b. Therefore, after that, when the sub-portion 120a and the sub-portion 120b are turned back in the direction of the arrow 104 as shown in FIG. 2F, the straight line connecting the pair of slits 117a (that is, the upper base 122a) and the pair of slits 117b are connected. It is defined by a straight line (ie, the upper base 122b). Accordingly, the sub portions 120a and 120b can be easily folded back along the upper bases 122a and 122b.

  In the defoaming material manufacturing method described in Patent Documents 1 and 2 described above, a thin-walled portion is formed by thermal fusion or the like along the boundary between the main portion and the sub-portion in order to define the folding position of the sheet material. To do. On the other hand, in the first embodiment, slits 117a and 117b are formed instead of the thin portion. The slits 117a and 117b can be formed at the same time as punching out the sheet material 100 shown in FIG. 2A from the original fabric sheet using, for example, a Thomson blade or the like. Therefore, the slits 117a and 117b are much easier to form than the thin portion. Thereby, compared with the defoaming material of patent documents 1 and 2, the defoaming material 20 of this Embodiment 1 is easy to manufacture, and can reduce a manufacturing man-hour.

  In the above manufacturing method, the slits 117a and 117b are formed at both ends of the upper bases 122a and 122b of the sub portions 120a and 120b (see FIG. 2B). Therefore, as shown in FIG. 2F, the horizontal ends of the sub portions 120a and 120b are separated from the main portions 110a and 110b by the slits 117a and 117b. When the sub-parts 120a and 120b are stored between the main parts 110a and 110b, these four end parts may be pushed in between the main parts 110a and 110b in order. As described above, the slits 117a and 117b formed at both ends of the upper bases 122a and 122b facilitate the operation of housing the sub-parts 120a and 120b between the main parts 110a and 110b. Moreover, since both ends of the sub-parts 120a and 120b can be pushed deeply between the main parts 110a and 110b, the sub-parts 120a and 120b are moved from between the main parts 110a and 110b by the elastic recovery force of the sheet material 100 thereafter. The possibility of popping out can be reduced.

  The upper bases 122a and 122b of the sub parts 120a and 120b are shorter than the upper bases 112a and 112b of the main parts 110a and 110b. Moreover, the sub-portions 120a and 120b have a substantially trapezoidal shape in which the lower bases 121a and 121b (see FIG. 2A) parallel to the upper bases 122a and 122b are shorter than the upper bases 122a and 122b. Therefore, as shown in FIG. 1A, the sub-parts 120a and 120b can be easily and nicely accommodated between the main parts 110a and 110b.

  Since the mechanical strength of the sheet material 100 is relatively weak at the upper bases 122a and 122b which are the folding positions, the sub-parts 120a and 120b accommodated between the pair of main parts 110a and 110b are bent as shown in FIG. 1A. The possibility of jumping out from between the main portions 110a and 110b by the elastic recovery force of the sheet material 100 is low.

  As described above, the defoaming material 20 of Embodiment 1 is easy to manufacture, which is advantageous for reducing the cost of the defoaming material 20.

  And since it has a half-duplex structure like patent document 1, 2, it is excellent in a defoaming characteristic.

  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, but is preferably performed after, for example, FIG. 2E, that is, at any stage after the sheet material 100 is formed into a bag shape.

  In the manufacturing method of the defoaming material 20, the pair of sub-parts 120a and 120b are stored between the pair of main parts 110a and 110b without turning the front and back of the bag-shaped sheet material 100 obtained in FIG. 2E. The defoamer of the invention may be completed.

(Blood reservoir)
An example of a blood reservoir equipped with the defoaming material 20 will be described.

  FIG. 3 is a perspective view showing a schematic configuration of the blood reservoir 1 according to Embodiment 1 of the present invention, and FIG. 4 is a side sectional view thereof. The blood reservoir 1 is an intracardiac blood reservoir integrated venous blood reservoir that stores venous blood and intracardiac blood.

  In FIG. 3, the blood reservoir 1 includes a housing 10 including a housing main body 11 and a lid 16 placed on the housing main body 11.

  The housing main body 11 includes a blood storage part 12 partially protruding from the center and a blood outflow port 13 provided at the lower end of the blood storage part 12 through which blood flows out. A fixing hole 14 for holding the blood reservoir 1 is formed on the lower surface of the housing body 11 by inserting the upper end of a support column erected in the operating room.

  The lid body 16 is provided with a plurality of blood inflow ports for allowing blood to flow into the blood reservoir 1. The blood inflow port includes a plurality of intracardiac blood inflow ports 51 through which intracardiac blood flows in and a venous blood inflow port 52 through which venous blood flows. Further, the lid 16 has a plurality of chemical solution injection ports 53 and 54 for mixing a chemical solution or the like into the blood, a large amount of a chemical solution is urgently mixed into the blood, or the filter 31 of the cardiotomy section 30 is used due to clogging. Service port 55 for allowing blood that has passed through an alternative cardiotomy section to flow in when it is not possible, exhaust port 56 for adjusting the pressure in blood reservoir 1, and pressure in blood reservoir 1 being abnormal A pressure regulating valve 57 and the like for preventing a positive pressure or a negative pressure are provided. The venous blood flow inlet port 52 is inserted with a temperature probe 58 for measuring the temperature of venous blood.

  The venous blood flow inlet port 52 is connected to a blood removal line tube of the extracorporeal blood circulation circuit, and the intracardiac blood flow inlet port 51 is connected to an intracardiac blood suction line tube. The blood outflow port 13 is connected to a tube of a blood supply line of the extracorporeal blood circulation circuit. The chemical liquid injection ports 53 and 54 are connected to a chemical liquid injection line tube connected to a predetermined chemical liquid container. The drug solution flowing in from the drug solution injection port 53 flows into the blood reservoir 12 without passing through the cardiotomy section 30, and the drug solution flowing in from the drug solution injection port 54 flows into the blood reservoir section 12 after passing through the cardiotomy section 30. Various lines of tubes are connected to the service port 55. The temperature probe 58 is connected to electrical wiring connected to the temperature measuring device.

  As shown in FIG. 4, a defoaming frame 40 that holds a filter net 47 is accommodated in the housing 10. The defoaming frame 40 includes a cup-shaped portion 41 having a substantially bowl shape, and a frame-shaped portion 45 formed of a lattice-shaped frame formed on one side surface of the cup-shaped portion 41. The frame-like portion 45 extends below the cup-like portion 41 so as to be inserted into the blood reservoir 12 of the housing body 11. On the side surface of the frame-like portion 45, openings are formed in a lattice shape over the entire range in the vertical direction of the frame-like portion 45. A filter net 47 is fixedly held on the frame-shaped portion 45 so as to close the opening of the frame-shaped portion 45. In FIG. 4, a region with a large number of dots indicates the filter screen 47. The lower end of the frame-like portion 45 reaches the vicinity of the blood outflow port 13.

  The filtration network 47 has a function as a filter that removes foreign matters and bubbles in the blood when the blood passes through the filtration network 47. There is no restriction | limiting in particular in the structure and material of the filtration net | network 47, A well-known thing can be selected suitably and can be used. For example, a screen filter having a large number of fine openings can be used as the filter net 47. The filter screen 47 may be coated with an antifoaming agent (for example, silicone or the like) to give a bubble defoaming function.

  The venous blood inlet port 52 and the upper end of the venous blood conduit 59 are connected via the lid body 16. The venous blood conduit 59 is guided inside the defoaming frame 40 from the cup-shaped portion 41 to the frame-shaped portion 45 through the space between the lower end of the cardiotomy portion 30 and the bottom surface of the cup-shaped portion 41, and the opening at the lower end thereof. Is located below the lowest blood level L of the blood reservoir 1.

  A cardiotomy section 30 is provided below the intracardiac blood flow inlet port 51.

  The cardiotomy section 30 includes a filter 31 having a substantially bag shape (or a shape similar to a paper coffee filter used for coffee extraction) and an antifoaming material 20 (see FIG. 1A, see FIG. 1B).

  The filter 31 has a function of capturing and removing foreign substances in the blood when blood (intracardiac blood) passes through the filter 31. Further, it may have a function of trapping bubbles. Although there is no restriction | limiting in particular as the filter 31, For example, a well-known filter material can be used as a cardiotomy part, such as a mesh filter which consists of resin materials, such as polyester, nylon, a polypropylene. The pore diameter of the filter 31 is not particularly limited, but is preferably 20 to 50 μm. The filter 31 may be coated with an antifoaming agent (for example, silicone) to provide a bubble defoaming function.

  The upper end of the filter 31 and the upper end of the defoaming material 20 are fixed to the resin plate 33. The material of the resin plate 33 is not particularly limited, but for example, an adhesive such as polyurethane can be used. The resin plate 33 holding the filter 31 and the defoaming material 20 is fixed to the lower surface of the lid body 16. An opening (through hole) is formed in the center of the resin plate 33. An intracardiac blood conduit 36 communicating with the intracardiac blood inflow port 51 and a drug solution conduit 37 communicating with the drug solution injection port 54 are inserted into the opening.

  By covering the lid 16 on the defoaming frame 40, the cardiotomy section 30 held by the lid 16 is arranged in the defoaming frame 40.

  The flow of blood in the blood reservoir 1 will be briefly described.

  In FIG. 4, the intracardiac blood sucked from the patient's operative field sequentially passes through the intracardiac blood inlet port 51 and the intracardiac blood conduit 36 and flows into the cardiotomy section 30. Bubbles mixed in the intracardiac blood float on the blood surface, but break the bubbles when they come into contact with the defoaming material 20. The intracardiac blood in the cardiotomy section 30 sequentially passes through the defoaming material 20 and the filter 31 and flows into the defoaming frame 40. At this time, foreign matters and bubbles such as meat pieces, fat, and blood clots contained in the intracardiac blood are captured by the filter 31.

  On the other hand, the venous blood removed from the patient's vein passes through the venous blood inlet port 52 and the venous blood conduit 59 in order, and flows into the antifoaming frame 40 from the opening at the lower end of the venous blood conduit 59.

  Intracardiac blood and venous blood are mixed in the defoaming frame 40, pass through the filter network 47, and flow out of the blood reservoir 1 through the blood outflow port 13.

  In this process, the blood is temporarily stored in the blood reservoir 12 so that the blood level is above the minimum blood level L.

  The blood reservoir 1 of the first embodiment has a cardiotomy section 30 including the antifoaming material 20 described above. The defoaming material 20 has a half-duplex structure. As shown in FIG. 4, the outer layer 21 of the defoaming material 20 surrounds the space in the cardiotomy section 30 in the horizontal direction, and the inner layer 22 of the defoaming material 20 is disposed so as to block the space above. Has been. Therefore, in the cardiotomy section 30, the bubbles that float on the blood surface and come into contact with the outer layer 21 are broken. On the other hand, air bubbles that do not come into contact with the outer layer 21 rise upward on the blood surface, but most of them come into contact with the lower end surface of the inner layer 22 and break up. Thereby, the abnormal increase of the bubble in the cardiotomy part 30 is prevented. Therefore, the blood reservoir 1 of the first embodiment is excellent in the defoaming characteristics in the cardiotomy section 30.

  Moreover, as above-mentioned, the antifoamer 20 is easy to manufacture and can reduce a manufacturing man-hour. Therefore, the cost of the blood reservoir 1 can be reduced.

  Slits 117a and 117b are formed along the upper bases 122a and 122b of the sub-parts 120a and 120b. The sub-parts 120a and 120b are connected to the main parts 110a and 110b via the central parts 101a and 101b of the upper bases 122a and 122b. (See FIG. 1A). Therefore, when the blood reservoir 1 is assembled, when the intracardiac blood conduit 36 and the drug solution conduit 37 are inserted into the through hole 61 of the resin plate 33 of the cardiotomy section 30 from above (see FIG. 4), the lower ends of the conduits 36 and 37 are inserted. Is not easily caught by the sub-parts 120a and 120b. Therefore, the antifoaming material 20 of Embodiment 1 is advantageous for facilitating the assembly of the blood reservoir 1.

<Embodiment 2>
The second embodiment is different from the first embodiment with respect to the positions and the number of slits 117a and 117b (see FIG. 2B) formed in the sheet material 100. The second embodiment will be described below with a focus on differences from the first embodiment.

  FIG. 5A is a plan view of a sheet material 100a used for manufacturing the defoaming material according to the second embodiment. In the sheet material 100a, three slits 117a and 117b are formed along the upper bases 122a and 122b of the sub portions 120a and 120b. That is, in addition to a pair of slits 117a and 117b passing through both ends of the upper bases 122a and 122b, slits 117a and 117b are formed at the center of the upper bases 122a and 122b. Using this sheet material 100a, the antifoaming material of the present invention can be produced in the same manner as in Embodiment 1, and further, a blood reservoir can be produced.

  Since the three slits 117a and 117b are formed along the upper bases 122a and 122b, the mechanical strength of the sheet material 100a shown in FIG. 5A is higher in the upper bases 122a and 122b than the sheet material 100 of the first embodiment. It becomes weaker. Therefore, the work (see FIG. 2F) of turning back the sub-parts 120a and 120b along the upper bases 122a and 122b becomes easier. Further, as shown in FIG. 1A, the sub-parts 120a and 120b housed between the pair of main parts 110a and 110b may jump out from between the main parts 110a and 110b by the elastic recovery force of the folded sheet material 100a. Is even lower.

  In FIG. 5A, the number of slits 117a and 117b along the upper bases 122a and 122b of the sub-parts 120a and 120b is not necessarily three, and may be four or more.

  FIG. 5B is a plan view of another sheet material 100b used for manufacturing the defoaming material according to the second embodiment. In the sheet material 100b, one slit 117a, 117b is formed along the upper bases 122a, 122b of the sub portions 120a, 120b. The slits 117a and 117b do not pass through both ends of the upper bases 122a and 122b, and are formed only at the centers of the upper bases 122a and 122b. Using this sheet material 100b, the antifoaming material of the present invention can be produced in the same manner as in Embodiment 1, and further, a blood reservoir can be produced.

  Even if the number of the slits 117a and 117b formed in the upper bases 122a and 122b is one, the mechanical strength of the sheet material 100b in the upper bases 122a and 122b can be reduced by adjusting the length thereof. It is. Therefore, even when the sheet material 100b is used, the work of folding back the sub portions 120a and 120b along the upper bases 122a and 122b (see FIG. 2F) is easy. However, since both ends of the upper bases 122a and 122b of the sub-parts 120a and 120b are connected to the main parts 110a and 110b, the workability of storing the end parts of the sub-parts 120a and 120b between the main parts 110a and 110b is There is a possibility that it is inferior to the first embodiment. Further, when the blood reservoir 1 is assembled, when the intracardiac blood conduit 36 and the drug solution conduit 37 are inserted into the through hole of the resin plate 33 of the cardiotomy section 30 from above, the lower ends of the conduits 36 and 37 are connected to the sub-portions 120a and 120b. The possibility of catching on the upper bases 122a and 122b increases as compared with the first embodiment.

  The second embodiment is the same as the first embodiment except for the above.

<Embodiment 3>
The third embodiment is different from the first embodiment with respect to the dimensions of the sub-parts 120a and 120b (see FIG. 2A) formed on the sheet material 100. The third embodiment will be described below with a focus on differences from the first embodiment.

  FIG. 6 is a plan view of a sheet material 100c used for manufacturing the defoaming material according to the third embodiment. In this sheet material 100c, the upper bases 122a and 122b of the sub-parts 120a and 120b have the same length as the upper bases 112a and 112b of the main parts 110a and 110b. As in the first embodiment, a pair of slits 117a and 117b having substantially the same length are formed along the upper bases 122a and 122b from both ends of the upper bases 122a and 122b of the sub-parts 120a and 120b. Using this sheet material 100c, the antifoaming material of the present invention can be produced in the same manner as in Embodiment 1, and further, a blood reservoir can be produced.

  Since the slits 117a and 117b are formed along the upper bases 122a and 122b, the mechanical strength of the sheet material 100c on the upper bases 122a and 122b is weak as in the first embodiment. Therefore, even when the sheet material 100c is used, the work of folding back the sub portions 120a and 120b along the upper bases 122a and 122b (see FIG. 2F) is easy. However, since the upper bases 112a and 112b of the main parts 110a and 110b and the upper bases 122a and 122b of the sub parts 120a and 120b have the same length, the ends of the sub parts 120a and 120b are placed between the main parts 110a and 110b. The workability to store may be inferior to that of the first embodiment.

  In FIG. 6, the positions and number of the slits 117a and 117b can be changed as described in the second embodiment.

  The third embodiment is the same as the first embodiment except for the above.

  The above embodiments are merely exemplary. The present invention is not limited to the above embodiment, and can be modified as appropriate.

  In the cardiotomy section 30 described above, the defoaming material 20 is held by being bonded to the resin plate 33, but the method of holding the defoaming material 20 is not limited to this. For example, the lower end of the defoaming material 20 may be supported by a jig so that the defoaming material 20 does not descend with respect to the filter 31.

  The configuration of the blood reservoir containing the cardiotomy section 30 including the defoaming material 20 of the present invention is not limited to the above, and can be selected as appropriate 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 a blood reservoir provided in an extracorporeal blood circulation circuit used when performing cardiopulmonary surgery or the like.

DESCRIPTION OF SYMBOLS 1 Blood reservoir 20 Antifoam material 21 Outer layer 22 Inner layer 30 Cardiotomy part 100,100a, 100b, 100c Sheet material 110a, 110b Main part 111a, 111b Lower edge (lower bottom) of main part
112a, 112b Upper edge (upper bottom) of main part
117a, 117b Slit 120a, 120b Sub part 122a, 122b Upper edge (upper bottom) of sub part

Claims (10)

An outer layer having a bag shape including a pair of main portions opposed to each other and opened only on the upper side;
An anti-foaming material comprising a single continuous sheet material, comprising an inner layer disposed between the pair of main parts and including a pair of sub-parts superimposed on the pair of main parts,
A slit is formed between the upper edge of each of the main part and the sub part that overlap each other,
The defoaming material characterized in that the upper edge of each of the main portion and the sub-portion overlapping each other is continuous at a portion excluding the slit.   The antifoaming material according to claim 1, wherein the slit is formed at a plurality of locations including at least both ends of the upper edge of the sub part.   The defoamer according to claim 1 or 2, wherein the upper edge of the sub part is shorter than the upper edge of the main part. The main part has a substantially trapezoidal shape,
The upper edge of the main part is a longer side of two substantially parallel sides of the substantially trapezoidal shape of the main part,
The sub-portion has a substantially trapezoidal shape;
The defoaming material according to any one of claims 1 to 3, wherein the upper edge of the sub part is a longer side of two substantially parallel sides of the substantially trapezoidal shape of the sub part. A blood reservoir with a cardiotomy section,
The said cardiotomy part is a blood reservoir which incorporates the antifoamer in any one of Claims 1-4. Preparing a single continuous sheet material including a pair of main parts and a pair of sub-parts arranged so as to sandwich the pair of main parts;
Forming a slit along a boundary between the main part and the sub part;
A bag shape in which the sheet material is bent along a boundary between the pair of main portions so that the pair of main portions overlap each other and the pair of sub portions overlap each other, and only the pair of sub portions open. Bonding the pair of main portions along their edges so as to include:
A step of folding the pair of sub-parts along a boundary between the main part and the sub-parts so that the pair of sub-parts are disposed between the pair of main parts. Production method of foam material.   The method for producing an antifoaming material according to claim 6, wherein the slit is formed at a plurality of locations including at least both ends of a boundary between the main portion and the sub portion.   The defoaming according to claim 6 or 7, wherein the dimension of the sub part along the boundary between the main part and the sub part is shorter than the dimension of the main part along the boundary between the main part and the sub part. A method of manufacturing the material. The main part has a substantially trapezoidal shape,
The pair of main portions are continuous with each other with the shorter side of the substantially trapezoidal two sides substantially parallel to each other,
The sub-portion has a substantially trapezoidal shape;
The longer side of the substantially trapezoidal shape of the sub-portion, which is substantially parallel to each other, is made to coincide with the longer side of the substantially trapezoidal shape of the main portion, which is substantially parallel to each other. The method for producing an antifoaming material according to any one of claims 6 to 8, wherein the main part and the sub part are continuous.   The method further comprises the step of turning over the sheet material to which the pair of main portions are joined so as to have a bag shape before the step of folding the pair of sub portions along the boundary between the main portion and the sub portion. Item 10. A method for producing an antifoaming material according to any one of Items 6 to 9.

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