JP2018099246A - Medical spout and medical bag including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical spout capable of suppressing generation of resin stagnation also with irregularities formed in a deposition part.SOLUTION: A medical spout to be welded to a medical bag body which is formed in a bag shape by sticking at least two film-like members and into which a content having flowability can be injected, for discharging the content in the medical bag body includes: a welding part in which a communication path penetrating in a prescribed direction is formed, and which is configured so that it is inserted between the two film-like members and an outside surface thereof can be welded to the two film-like members; and a cylindrical discharge part projecting from one end of the welding part in the prescribed direction to one side in the prescribed direction, and having an inner hole connecting to the connection path. The outside surface is formed with irregularities, and a notch extending over the whole circumference is formed in the outer peripheral edge of the other end of the welding part in the prescribed direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a medical spout that discharges stored items in a bag body, and a medical bag including the medical spout.

  A nutrient such as an enteral nutrient is injected into a bag-like medical bag and administered to a patient. The medical bag is configured as follows, for example. That is, a medical bag is formed by superimposing two sheet members and then welding the peripheral edges of the two sheet members over substantially the entire circumference. In addition, the medical bag is provided with a medical spout for discharging the nutrient in the medical bag. The medical spout is inserted between two sheet members and welded to them. Regarding such a spout, for example, a spout as in Patent Document 1 is known. The spout of Patent Document 1 has a heat seal portion, which is inserted into an opening formed in the bag body and heat sealed there.

JP 2013-60213 A

  In the spout of Patent Document 1, welding is performed using, for example, a heat welding machine. In the heat welding machine, the heat seal part inserted into the opening of the bag body is sandwiched by the press part of the heat welding machine together with the bag body, and the heat seal part is welded to the bag body by further applying heat. The press surface of the press portion is basically formed in accordance with the surface shape of the heat seal portion, but a shape that does not require high processing accuracy from the viewpoint of manufacturing cost and the like is preferable. However, when the outer surface of the heat seal part is formed flat like the spout of Patent Document 1, if the processing accuracy of the press surface is low, a gap is locally generated between the heat seal part and the press surface. In some cases, the desired adhesive strength may not be obtained. Therefore, in order to obtain sufficient adhesive strength even if the processing accuracy of the press surface is low, it has been considered to form irregularities on the outer surface of the heat seal portion. In this case, the convex part can be deformed in accordance with the shape of the press surface by pressing the press part mainly on the convex part and melting it. As a result, the generation of a gap between the press surface and the convex portion is suppressed, and a desired adhesive strength can be obtained. On the other hand, when irregularities are formed on the outer surface of the heat seal portion, the fluidity of the molten synthetic resin increases, the molten synthetic resin flows in various directions, and resin pools occur at various locations.

  Then, this invention aims at providing the medical spout which can suppress generation | occurrence | production of a resin pool by forming an unevenness | corrugation in a welding part, and a medical bag provided with the same.

  The medical spout of the present invention is welded to a medical bag body that is formed in a bag shape by laminating two film-like members and is capable of injecting a fluid storage product, and is stored in the medical bag body. A medical spout for discharging an object, wherein a communication passage penetrating in a predetermined direction is formed and inserted between the two film-like members so that an outer surface can be welded to the two film-like members A welded portion that protrudes in one predetermined direction from one end in a predetermined direction of the welded portion, and a cylindrical discharge portion that has an inner hole connected to the communication path. A cutout extending over the entire circumference in the circumferential direction is formed at the outer peripheral edge of the other end portion in the predetermined direction of the welded portion.

  According to the present invention, since the notch is formed in the outer peripheral edge of the other end portion in the predetermined direction in the welded portion, the synthetic resin is captured by the notch and the predetermined direction from the other end in the predetermined direction of the welded portion. It is possible to suppress the synthetic resin from flowing out to the other side. Thereby, it can suppress that a synthetic resin flows out to the other predetermined direction at the other end of the predetermined direction of a welding part, and a resin pool is formed.

  According to the present invention, it is possible to suppress the accumulation of resin by forming irregularities in the welded portion.

It is a front view which shows the attitude | position at the time of the medical bag which concerns on embodiment of this invention, and its use. It is a perspective view which shows the spout with which the medical bag of FIG. 1 is equipped. It is the front view which looked at the spout of FIG. 2 from the front. It is sectional drawing which cut | disconnected and saw the medical spout of FIG. 2 in the virtual plane parallel to a paper surface. It is sectional drawing which cut | disconnected the spout of FIG. 3 by the cutting line VV.

  Hereinafter, a medical bag 1 according to an embodiment of the present invention and a spout 2 provided therein will be described with reference to the drawings. In addition, the concept of the direction used in the following description is used for convenience in description, and does not limit the direction of the configuration of the invention in that direction. Moreover, the medical bag 1 and the medical spout 2 which are demonstrated below are only one Embodiment of this invention. Therefore, the present invention is not limited to the embodiments, and additions, deletions, and changes can be made without departing from the spirit of the invention.

[Medical bag]
<Bag body>
The medical bag 1 shown in FIG. 1 is a fluid storage product (for example, a gel or a liquid nutrient, and a small solid or granular material added thereto. The liquid may be a liquid such as a drip solution or a drug solution without being limited to a nutrient, and is used when a nutrient is administered to a patient. The medical bag 1 is used, for example, as a bag for containing an enteral nutrient. More specifically, the medical bag 1 includes a bag body 11 and a spout 2. The bag body 11 is configured in a bag shape, and is configured so that a nutrient can be injected therein. That is, the bag main body 11 has two sheet-like members 12 and 13 that constitute the front surface and the back surface, respectively. The two sheet-like members 12 and 13 are sheets made of synthetic resin, are generally rectangular and are formed in substantially the same shape. Examples of the synthetic resin constituting the two sheet-like members 12 and 13 include polyethylene (PE), polypropylene (PP), polyamide (PA) polyester (PET), polyvinyl chloride (PVC), polybutadiene, nylon, and ethylene acetate. A highly flexible material such as vinyl copolymer (EVA) is used. Further, in order to control the oxygen and water vapor permeability of the sheet or optimize the strength of the sheet, the sheet-like members 12 and 13 may be formed of two or more layers, and the material of each layer is the same or different. Materials may be used.

  The two sheet-like members 12 and 13 configured in this way are overlapped so that their peripheral edges are aligned, and the peripheral edges of the two sheet-like members 12 and 13 are welded together on three sides. (Refer to the dot pattern portion in FIG. 1 and the bonding portions 12a and 13a). The remaining one side is not welded, and an opening 14 is formed there. Thus, the bag body 11 is formed in a bag shape having the opening 14. Further, a zipper 15 (not shown) is provided in the opening of the bag main body 11 so that the inside of the bag main body 11 can be sealed by closing the opening 14 of the bag main body 11 by the zipper 15.

  The bag body 11 configured in this way is suspended on one side of the two sides adjacent to the opening 14 so as to be hooked on the remaining one side described above. A hole 11a is formed. In addition, the peripheral portion of the bag body 11 has a corner portion 11 b on the other side of the two sides adjacent to the opening 14 and on the opposite side of the opening. The edge 11c of the corner 11b is cut obliquely (for example, at an angle of about 45 degrees) with respect to the two sides forming the corner 11b, that is, is chamfered. Further, an insertion hole 11d is formed in the corner portion 11b, and the insertion hole 11d extends in a direction orthogonal to the end edge 11c. That is, the insertion hole 11 d is formed so as to penetrate the bonding portions 12 a and 13 a of the bag body 11 and connects the inside and the outside of the bag body 11. The spout 2 is inserted through the insertion hole 11d, and the spout 2 is welded to the bag body 11 in this state.

<Spout>
The spout 2, which is a medical spout, is for discharging nutrients injected into the bag body 11. The spout 2 is configured to be connectable to the medical tube 3 so that a nutrient can be administered to the patient via the connected medical tube 3. More specifically, the spout 2 is made of a synthetic resin and is formed by a method such as injection molding. Examples of the synthetic resin constituting the spout 2 include polyethylene (PE), polypropylene (PP), polyamide (PA) polyester (PET), polyvinyl chloride (PVC), polybutadiene, nylon, and ethylene vinyl acetate copolymer ( A material having a composition similar to that of the sheet-like members 12 and 13 such as EVA) is used. By using such a material, the spout 2 and the sheets 13 and 14 can be easily melted, and the adhesive strength can be improved.

  The spout 2 formed in this way has a welded portion 21 and a discharge portion 22 as shown in FIGS. 2 and 3, and the welded portion 21 includes a main body portion 23 and a pair of extending portions 24, 24. The main body portion 23 is formed in a thin and generally cylindrical shape, and extends along a predetermined axis L1. In addition, the outer peripheral surface and the inner peripheral surface of the main body portion 23 are both substantially rhombus-shaped (that is, also referred to as a boat shape) as viewed from a virtual plane perpendicular to the axis L1. The shape of the communication passage 25 that is a hole is formed to have substantially the same shape (excluding the area) as the outer shape (outer peripheral surface contour) of the main body portion 23. Therefore, the main body portion 23 is formed thin. Further, the outer peripheral surface of the main body portion 23 is formed with irregularities, and in this embodiment, a plurality of concave grooves (four concave grooves in the present embodiment) are formed on the outer peripheral surface of the main body portion 23 in order to form the irregularities. 23a is formed.

  Each concave groove 23a is a groove formed so as to dent the outer peripheral surface of the main body portion 23 in a direction perpendicular thereto (see also FIG. 4), and extends along the entire outer circumferential surface of the main body portion 23 in the circumferential direction. It extends straight. That is, each concave groove 23a extends in a direction (width direction to be described later) orthogonal to the axis L1 in a front view as shown in FIG. These four concave grooves 23a are formed so that their groove widths w1 are substantially the same, and are arranged at equal intervals in the axial direction. Of the four concave grooves 23a, the concave groove 23a located on one side in the axial direction is formed at one end in the axial direction of the main body portion 23 and the vicinity thereof, and the concave groove 23a located on the other side in the axial direction is the main body portion 23. It is arrange | positioned away from the axial direction other end of this to one axial direction. Therefore, on the outer peripheral surface of the main body portion 23, the ridges 23b are formed between the two adjacent grooves 23a and on the other side in the axial direction of the groove 23a located on the other side in the axial direction. . The four ridges 23 b formed in this way are also arranged at equal intervals on the outer peripheral surface of the main body portion 23.

  Each ridge portion 23 b extends straight along the outer peripheral surface of the main body portion 23 and over the entire circumference in the circumferential direction. That is, each ridge portion 23b also extends in a direction (width direction to be described later) orthogonal to the axis L1 when viewed from the front, like each groove 23a. The four ridges 23b are formed with the same width w2 because the four grooves 23a are arranged at equal intervals, and the width w2 of the ridges 23b is larger than the groove width w1 of the grooves 23a. It is getting wider. In addition, a notch 23c is formed on the other axial side of the convex portion 23b located on the other side in the axial direction among the four convex portions 23b, that is, on the other end in the axial direction of the main body portion 23.

  The notch 23 c is formed by cutting out the outer peripheral edge of the other end portion in the axial direction of the main body portion 23, and extends over the entire circumference in the outer peripheral edge of the other end portion in the axial direction of the main body portion 23. The width (that is, the length in the axial direction) w3 of the notch 23c formed in this way is narrower than the groove width of the concave groove 23a. For example, the relationship between the space volume Vc of the notch 23c and the space volume Va of the groove 23a is preferably 1.5 × Vc ≦ Va ≦ 3.0 × Vc, and 2.0 × Vc ≦ Va ≦ 2. More preferably, it is 8 × Vc. By configuring in this way, the protruding ridges 23b are melted by pressing of the press part, and the molten protruding ridges 23b flow into the recessed grooves 23a and the notches 23c, thereby making it difficult to generate burrs. In addition, the notch 23c is formed in the outer peripheral surface of the main-body part 23 by the substantially same depth d as the concave groove 23a (refer FIG. 4). As described above, the outer peripheral surface of the main body portion 23 is formed with unevenness arranged in a predetermined direction. In addition, the main body portion 23 is integrally formed with a pair of extending portions 24 and 24.

  The pair of extending portions 24 and 24 are respectively formed on the outer peripheral surface of the main body portion 23, and each is located on the outer circumferential surface of the main body portion 23 on the opposite side in the circumferential direction. More specifically, the cross section of the outer peripheral surface of the main body portion 23 is generally formed in a diamond shape as described above, and two corner portions that are not adjacent to each other can be connected by diagonal lines d1 and d2. The extending portions 24 and 24 are integrally formed with two corners 23d and 23d that define a long diagonal d1 that is a longer diagonal of the two diagonals d1 and d2. Further, the pair of extending portions 24, 24 protrude from the respective corners 23d, 23d in the direction in which the long diagonal line d1 extends, that is, in the width direction, and the direction in which the short diagonal line d2, which is the shorter diagonal line, extends, ie, the depth. It is formed thinner than the main body portion 23 in the direction. Further, the pair of extending portions 24, 24 extend to a flange 26 described later on one side in the axial direction, and extend to the other end in the axial direction of the main body portion 23 on the other side in the axial direction. Further, the end surfaces 24a, 24a on the other side in the axial direction of the pair of extending portions 24, 24 are inclined with respect to the other end in the axial direction of the body portion 23 that is chamfered and formed flat. Note that the shape of the end surface 24a is not particularly limited, and may be a shape that is obliquely cut out, an arc shape, or a chamfered shape leaving an extended portion as in the present embodiment.

  The welding portion 21 configured as described above is inserted into the insertion hole 11 d formed in the corner portion 11 b of the bag body 11 and is welded to the bag body 11. The length of the welded portion 21 in the axial direction is formed to be approximately the same as the length of the insertion hole 11d (that is, the length in the direction in which the insertion hole 11d passes through the corner portion 11b). Therefore, when the welding portion 21 is appropriately positioned when inserted into the insertion hole 11d, both ends in the axial direction of the welding portion 21 are flush with the outer peripheral edge and the inner peripheral edge (that is, the inner peripheral surface) of the bag body 11. Can do. In order to perform such positioning, a flange 26 is formed at one axial end of the main body portion 23.

  The flange 26 is formed in a substantially plate shape, and is formed at one end in the axial direction of the main body portion 23 so as to be orthogonal to the axis L1. The outer shape of the flange 26 is formed long in the width direction similarly to the main body portion 23 and is formed in an octagon when viewed from one side in the axial direction. More specifically, the flange 26 is an octagon formed by obliquely cutting four corners with respect to a generally rectangular plate having the same length in the width direction and the depth direction as those of the welded portion 21. ing. The outer shape of the flange 26 having such a shape is larger than the insertion hole 11d. When the welding portion 21 is inserted into the insertion hole 11d, the flange 26 comes into contact with the end 11c of the corner portion 11b. By contacting, the spout 2 is restricted from entering the insertion hole 11d deeper than the spout 2, and the welding portion 21 is positioned in the insertion hole 11d. Thereby, the both ends of the welding part 21 in the predetermined direction are flush with the outer peripheral edge and the inner peripheral edge of the bag body 11, respectively. The discharge portion 22 is formed integrally with the flange 26 having such a function.

  The discharge portion 22 is formed in a substantially cylindrical shape and protrudes from the flange 26 in one axial direction. Moreover, the discharge part 22 is extended along the axis line L1, and the recessed part 22a is formed in the intermediate part of the outer peripheral surface. The recess 22 a is formed on the outer peripheral surface of the discharge portion 22 over the entire circumference in the circumferential direction. Moreover, the outer peripheral surface of the discharge part 22 is formed in a taper shape on the tip side (that is, one end side in the axial direction) from the recess 22a, and is tapered toward the tip. The discharge portion 22 formed in this way is inserted into the medical tube 3 at its tip, and the medical tube 3 is externally connected to the medical tube 3 (see FIG. 1). The discharge portion 22 formed in this way is formed in a substantially cylindrical shape as described above, and has an inner hole 22b as shown in FIGS.

  The inner hole 22 b is formed along the axis L 1, opens at the distal end of the discharge portion 22, and the base end side is connected to the communication path 25 of the main body portion 23. The inner hole 22 b formed in this way constitutes a discharge passage 27 together with the communication passage 25. That is, the discharge passage 27 extends along the axis L1 so as to penetrate the spout 2 from one end in the axial direction of the spout 2 (ie, the tip of the discharge portion 22) to the other end in the axial direction (ie, the other end in the axial direction of the welded portion 21). The nutrient solution is allowed to flow therethrough and can be sent out (that is, discharged) from the bag body 11 to the medical tube 3. Further, in the discharge passage 27, the communication passage 25 of the welded portion 21 and the inner hole 22b of the discharge portion 22 have different shapes, and the inner hole having a generally circular cross section with respect to the outer shape of the communication passage 25 having a generally cross-sectional rhombus shape. The outer shape of 22b is small. Therefore, in the communication path 25, the connection portion 25a connected to the inner hole 22b is formed in a tapered shape, and the connection portion 25a is formed to be tapered toward the inner hole 22b. Thereby, it can suppress that a nutrient remains in the connection part 25a.

<Attaching the spout>
Below, the attachment method at the time of attaching the spout 2 to the corner part 11b of the bag main body 11 is demonstrated, referring FIG. The bag body 11 is formed into a bag shape by welding the three peripheral edge portions excluding the corner portion 11b, and an insertion hole 11d is formed in the corner portion 11b. The welding portion 21 of the spout 2 is inserted into the insertion hole 11d, and as the welding portion 21 is inserted, the flange 26 comes into contact with the end edge 11c of the corner portion 11b. As a result, the spout 2 is positioned, and the welded portion 21 is flush with the outer peripheral edge and the inner peripheral edge of the bag body 11 at both axial ends. Thus, by making it flush | planar, it can prevent that the axial direction other end part of the spout 2 protrudes or dents with respect to the internal peripheral surface of the bag main body 11. FIG. In addition, if it protrudes or dents, a nutrient will accumulate in the part and it will remain as a residual liquid. In the medical bag 1 of this embodiment, since it is flush as described above, generation of residual liquid can be suppressed. When the spout 2 is thus disposed in the insertion hole 11d, the bag body 11 and the spout 2 are then welded together.

  That is, the corner 11b of the bag body 11 and the welded portion 21 of the spout 2 are welded by various methods such as an ultrasonic method, a hot air method, and a heat seal method. In the present embodiment, the welding portion 21 is welded to the corner portion 11b by a heat sealing method using a heat welding machine. That is, the press part of the heat welding machine is pressed against the welding part 21 inserted through the insertion hole 11d of the corner part 11b. At this time, the press part is pressed from both sides on the one side and the other side in the depth direction via the corner part 11 b and sandwiched so as to wrap the welded part 21. The press surface, which is the surface of the press part, is basically formed corresponding to the shape of the outer peripheral surface of the welded part 21, and heat is applied to the surface of the press part. Therefore, by pressing, the corner portion 11b and the welded portion 21 are melted and bonded.

  As described above, the outer surface of the welded portion 21 to be welded is formed to be uneven, but in the conventional spout, the outer surface of the portion corresponding to the welded portion 21 is formed flat. Therefore, in the conventional spout, if the processing accuracy of the press surface and the manufacturing accuracy of the spout 2 are low, the press surface and the portion corresponding to the weld portion 21 even if pressed against the press surface and the portion corresponding to the weld portion 21 A gap is formed between the two, and a portion where welding has not occurred occurs. Thereby, desired adhesive strength may not be obtained. On the other hand, the unevenness | corrugation (namely, the some groove 23a and the some protruding item | line part 23b) is formed in the outer surface of the welding part 21 as above-mentioned. By making the outer surface uneven, it is possible to flow the synthetic resin pressed against the pressing surface against the pressing surface and melted into the concave portion, and forming the protruding portion according to the pressing surface during welding it can. Therefore, the convex portion, that is, the ridge portion 23b can be evenly welded to the corner portion 11b. That is, even if there is a gap between the press surface and the convex portion 23b of the welded portion 21 at the time of starting pressing, the convex portion 23b is melted and the convex portion of the welded portion 21 is eventually melted. 23b and the corner portion 11b can be brought into close contact with each other. Thereby, the spout 2 can be welded to the bag body 11 with a desired adhesive strength.

  On the other hand, the molten synthetic resin flows in various directions by forming irregularities on the outer peripheral surface of the welded portion 21, and the molten synthetic resin flows into the bag body 11 and hardens to become a resin pool. In particular, in the welded portion 21, the protruding portion 23b is formed near the other end in the axial direction of the main body portion 23, and the welded portion 21 is welded to the vicinity of the other end in the axial direction. Is easy to flow out into the bag body 11. Therefore, the welded portion 21 of the present embodiment is formed with a notch 23c extending over the entire circumference in the outer peripheral edge at the other axial end of the main body portion 23. Thereby, the molten synthetic resin flowing near the other axial end of the main body portion 23 can be captured by the notch 23c, and the captured synthetic resin can be flowed along the notch 23c. Thereby, it can suppress that a synthetic resin flows out in the bag main body 11 direction from the axial direction other end of the main-body part 23, and suppresses that a resin pool is formed in the axial direction other end of the main-body part 23. be able to.

  Note that the depth d and the width w3 of the notch 23c are determined according to the amount of the synthetic resin that melts from the ridge 23b located on the other side in the axial direction. The amount of resin melted from the convex portion 23b located on the other side in the most axial direction can be estimated mainly from the pressing amount of the press portion, the pressing time of the press portion, and the like, and based on these, the notch 23c Depth d and width w3 are determined. The width w3 of the notch 23c is, for example, the resin volume of the w2 portion (that is, the volume of the ridge portion 23b) is Vb, and the spatial volume of the w3 portion in consideration of the pressing amount of the press portion or the pressing time of the press portion. Vc is preferably 0.1 × Vb ≦ Vc ≦ 0.4 × Vb, and more preferably 0.15 × Vb ≦ Vc ≦ 0.35 × Vb. If the space volume Vc is smaller than the resin volume Vb, the resin overflows and burrs are likely to occur. If the space volume Vc is too large with respect to the resin volume Vb, the space in the w3 portion is not filled with the resin and is liable to stay. Thus, by making the relationship between the resin volume Vb and the space volume Vc as described above, it is possible to suppress the molten synthetic resin from flowing out from the notch 23c.

  In this way, the spout 2 inserts the welded portion 21 into the insertion hole 11d of the corner portion 11b of the bag body 11, and pushes the press portions on both sides in the depth direction so as to sandwich the welded portion 21 from above the corner portion 11b. It is welded to the bag body 11 by applying and heating. As a result, the spout 2 is attached to the bag body 11. Further, the insertion of the spout 2 also closes the insertion hole 11d of the corner 11b so that the nutrient can be stored in the bag body 11 by injecting the nutrient from the opening of the bag body 11. Become. Further, the bag body 11 is hung by hanging a hook or the like in the suspension hole 11a, so that the corner 11b is positioned below the remaining portion (see the medical bag 1 indicated by two-point underline in FIG. 1). ). Thereby, the nutrient in the bag main body 11 can be discharged from the spout 2 to the medical tube 3, and the nutrient can be administered to the patient via the medical tube 3.

  In the medical bag 1 configured as described above, the width w2 of the ridge portion 23b is wider than the groove width w1 of the groove 23a in the weld portion 21 of the spout 2. Thereby, the part which the welding part 21 and the corner part 11b are welded can be taken widely, and even if an unevenness | corrugation is formed in the outer surface of the welding part 21, adhesive strength can be maintained. In addition, it is preferable that the groove width w1 of the concave groove 23a is determined according to the amount of the resin melted from the ridge 23b adjacent to the concave groove 23a, similarly to the width of the notch 23c. That is, it is preferable to determine the width of the groove 23a so that the volume of the groove 23a and the amount of resin melted from the ridge 23b substantially coincide.

  Further, in the spout 2, the outer shape of the main body portion 23 of the welded portion 21 and the shape of the flow path cross section of the communication passage 25 are formed substantially the same, and the main body portion 23 is formed thin. Therefore, when the nutrient in the bag main body 11 is discharged from the spout 2, the amount of residual liquid remaining in the bag main body 11 is thinned by blocking the nutrient at one end in the axial direction of the main body portion 23. It can be suppressed more than that of conventional spouts. Thereby, the quantity of the nutrient remaining as a residual liquid in the bag main body 11 can be suppressed from the conventional spout.

  Moreover, when forming the welding part 21 thinly in this way, the communicating path 25 and the inner hole 22b of the discharge part 22 are formed in a different shape, and a level | step difference will be formed in those connection parts. On the other hand, in the spout 2 of the present embodiment, since the connecting portion of the inner hole 22b of the discharge portion 22 is formed in a tapered shape in the communication passage 25, no step is formed in the discharge passage 27, and the discharge passage 27 The nutrients can be poured smoothly. Thereby, the spout 2 can reduce the amount of nutrients remaining in the discharge passage 27, that is, the amount of residual liquid, as compared with a spout in which a step is formed in the connection portion.

  Furthermore, in the spout 2, the axial direction length of the welding part 21 is larger than the width direction length. Thereby, the adhesive strength with respect to force can be improved in the direction (namely, axial direction) which pulls out the welding part 21 from the insertion hole 11d of the corner part 11b, and it suppresses that the spout 2 pulls out from the bag main body 11. Can do. Further, since the length in the axial direction of the welded portion 21 is larger than the length in the width direction, even if the welded portion 21 is gradually peeled off from the seal members 12 and 13 on the insertion hole side 11d, Peeling between the welded portion 21 and the seal members 12 and 13 is difficult to reach the outer end portion. As a result, it is possible to suppress the spout 2 from being peeled off from the sealing members 12 and 13 and the stored matter in the bag body 11 from leaking out.

  The welded portion 21 has a pair of extending portions 24 and 24 in addition to the main body portion 23, and the pair of extending portions 24 and 24 are formed in a plate shape. By providing such an extended portion 24, the area to be welded can be increased, and the adhesive strength can be improved. In addition, by forming the extending portion 24 in a plate shape, it is possible to suppress the interval between the two sheet-like members 12 and 13 from becoming abruptly increased in the welded portion 21 and being easily broken. Further, by chamfering the end surface 24a on the other end side in the axial direction of the extending portions 24, 24, the synthetic resin to be melted can flow into the bag body near the end surface 24a on the other end side in the axial direction. It is possible to suppress the occurrence of a resin pool that protrudes into the region 11.

<About other embodiments>
In the spout 2 of the present embodiment, the grooves 23a and the ridges 23b are formed as irregularities on the outer surface, but these are not necessarily required. For example, unevenness may be formed on the outer surface by forming a plurality of partial spherical protrusions on the outer surface. At this time, it is preferable that the concave area on the outer surface is smaller than the convex area, and by doing so, the adhesive strength can be increased as compared with the case where it is not. Further, the shape of the cross-section of the communication passage 25 is not necessarily limited to a roughly rhombus, but may be a generally circular shape.

  The bag body 11 of the present embodiment has an opening 14 and is configured so that the opening 14 can be opened and closed by a zipper 15. However, such a structure is not necessarily required. For example, nutrients may be injected into the bag main body 11 in advance and all four sides of the bag main body 11 may be welded and closed, and the bag main body 11 may be polygonal or round instead of rectangular when viewed from the front. There may be. Moreover, the apparatus used for welding is not limited to a heat welding machine, and any apparatus capable of welding may be used.

DESCRIPTION OF SYMBOLS 1 Medical bag 2 Spout 3 Medical tube 11 Bag main body 12,13 Sheet-like member 21 Welding part 22 Discharge part 22b Inner hole 23a Groove 23b Projection part 23c Notch 25 Communication path 25a Connection part 27 Discharge path

Claims (6)

A medical spout that is welded to a medical bag body that can be infused with a flowable stored material that is formed into a bag shape by laminating at least two film-like members, and discharges the stored material in the medical bag body. Because
A communication portion that is formed in a predetermined direction and is inserted between the two film-like members so that an outer surface can be welded to the two film-like members;
A cylindrical discharge portion that protrudes in one predetermined direction from one end in the predetermined direction of the welded portion and has an inner hole connected to the communication path;
Unevenness is formed on the outer surface,
A medical spout in which a cutout extending around the entire circumference in the circumferential direction is formed on the outer peripheral edge of the other end portion in the predetermined direction of the welded portion. The irregularities on the outer surface are formed by a plurality of convex portions extending along the outer surface and spaced apart in the predetermined direction,
2. The medical spout according to claim 1, wherein a volume of the notch is in a range of 10% to 40% of a volume of a protruding portion adjacent to the notch among the plurality of protruding portions. . There is a groove between the ridge portions adjacent on the outer surface,
The medical spout according to claim 2, wherein a groove width of the concave groove is smaller than a width of the adjacent ridge portion. The cross section perpendicular to the predetermined direction of the welded portion is roughly rhombus,
The medical spout according to any one of claims 1 to 3, wherein a length of the welding portion in the predetermined direction is longer than a length of a long diagonal of the rhombus. The discharge part is formed in a substantially cylindrical shape,
The welded portion has a thin wall shape so that the cross-section of the communication path has substantially the same shape as the outer shape of the welded portion,
5. The medical spout according to claim 4, wherein the communication path is formed in a tapered shape so that a portion on the discharge portion side becomes narrower toward an inner hole of the discharge portion. A medical spout according to any one of claims 1 to 5,
A medical bag main body that can be infused with a fluid storage product that is configured in a bag shape by laminating the two film-like members;
The medical spout is a medical bag inserted between the two film-like members and welded to the two film-like members.