Specimen retrieval bag and specimen retrieval device

Abstract

To provide a specimen take-out bag and a specimen take-out device capable of easily taking out an extracted specimen to the outside of a body in a housed state.SOLUTION: The bag for taking out the specimen is equipped with a bag main body 2 having a housing part side 2a for housing the specimen (excised piece) through an opening side 2b. The bag main body 2 is inclined obliquely downward from the opening side 2a to the distal end portion (back end portion side 2a) on the opposite side of the opening side 2c. That is, the bag main body 2 extends so as to have components in a direction intersecting the central axes of the opening side 2a and components in a direction away from the opening side 2a when viewed in the extending direction of the central axes.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] SPECIMEN RECOVERY BAG AND SPECIMEN RECOVERY DEVICE FIELD OF THE INVENTION The present invention relates to a specimen retrieval bag and a specimen retrieval device. [Background technology]

[0002] In thoracoscopic surgery, various instruments are used to remove a portion of an organ such as the lung where a tumor or other lesion has developed, and to remove the specimen from the body through an incision (operation port) made between the ribs (intercostal space). For example, Patent Document 1 discloses a specimen removal bag (referred to as an organ removal bag in the document) that is used in thoracoscopic surgery and can store and remove specimens such as resected organs. The transition portion of this specimen removal bag that leads to a small-diameter storage section is curved, without bending, in a direction that intersects with the direction in which the specimen is inserted and removed, in order to smoothly guide the specimen into the storage section. In order to prevent specimens and the like contained in the storage section from leaking or scattering outside the bag, the storage section of the specimen removal bag is formed at an angle of 90 degrees or more with respect to the direction in which the specimen is inserted or removed from the opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-65743 Summary of the Invention [Problem to be solved by the invention]

[0004] In thoracoscopic surgery, the incision made is made between the ribs, which limits the size of the hole, and the narrow space inside the thoracic cavity makes it difficult to remove specimens. As described above, the storage section of the specimen removal bag described in Patent Document 1 is formed at an angle of 90 degrees or more with respect to the direction in which the specimen is inserted and removed from the opening. As a result, the storage section protrudes when the extracted specimen is stored inside, making it difficult for the surgeon to remove the specimen removal bag from the body through the incision made in the body wall.

[0005] The present invention has been made in view of the above problems, and provides a specimen removal bag and a specimen removal device that allow an extracted specimen to be easily removed from the body while still containing the specimen. [Means for solving the problem]

[0006] The specimen removal bag of the present invention comprises a bag body having a storage section for storing specimens through an opening, and the bag body is characterized in that it slopes diagonally downward from the opening to the tip on the opposite side of the opening.

[0007] Furthermore, a specimen removal device according to the present invention is a specimen removal device including the above-mentioned specimen removal bag, The bag is characterized in that the opening of the bag body can be opened, and the opening in the open state can be closed. [Effects of the Invention]

[0008] The specimen removal bag and specimen removal device according to the present invention make it easy to remove an extracted specimen from the body while it is still contained therein. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic front view showing a specimen extraction bag according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing the storage section of the bag body that constitutes the modified specimen removal bag, and is an explanatory diagram showing the storage section in a state in which the bag body has contracted and is formed flat. [Figure 3]FIG. 10 is a schematic front view showing a specimen extraction bag according to a second embodiment. [Figure 4] FIG. 1 is a schematic diagram showing a state in which a specimen is contained in a specimen removal bag. [Figure 5] FIG. 10 is a schematic diagram showing a state in which the expansion / contraction section is expanded to push the specimen toward the opening. [Figure 6] FIG. 10 is a schematic front view showing a specimen extraction bag according to a third embodiment. [Figure 7] FIG. 10 is a schematic front view showing a specimen extraction bag according to a fourth embodiment. [Figure 8] FIG. 10 is a longitudinal cross-sectional view of a specimen retrieval device according to a fifth embodiment, showing the inner shaft in a second position; [Figure 9] FIG. 10 is a perspective view of a specimen retrieval device according to a fifth embodiment, showing the inner shaft in a second position. [Figure 10] FIG. 10 is a perspective view of a specimen retrieval device according to a fifth embodiment, showing the inner shaft in a first position. [Figure 11] FIG. 10 is a plan view of a specimen retrieval device according to a fifth embodiment, showing the inner shaft in a second position. [Figure 12] FIG. 10 is a plan view of a specimen retrieval device according to a fifth embodiment, showing the inner shaft in a first position. [Figure 13] FIG. 10 is a view showing a specimen extraction device according to a fifth embodiment, viewed from the proximal side. [Figure 14] FIG. 11 is a plan view showing the inner shaft in the fifth embodiment. [Figure 15] FIG. 15 is a cross-sectional view taken along line BB shown in FIG. [Figure 16] 16(a) and 16(b) are diagrams showing the holding portion and its surrounding structure in the fifth embodiment, with FIG. 16(a) being a plan view and FIG. 16(b) being a side view. [Figure 17] 17(a) and 17(b) are diagrams showing a pair of elastic pieces and their surrounding structure in the fifth embodiment, with FIG. 17(a) being a plan view and FIG. 17(b) being a side view. [Figure 18] Figures 18(a), 18(b), and 18(c) are views showing the gripping portion in the fifth embodiment, where Figure 18(a) is a side view, Figure 18(b) is a plan view, and Figure 18(c) is a back view. [Figure 19] Figure 19(a) is a schematic cross-section showing the rolled state of the bag body in the fifth embodiment, and Figure 19(b) is a schematic cross-section showing the rolled state of the bag body in the comparative example. [Figure 20] FIG. 10 is an explanatory view for explaining an example of a method of using the specimen extraction device according to the fifth embodiment, showing a state in which the distal end of the containing tube is inserted into a body cavity. [Figure 21] FIG. 10 is an explanatory view for explaining an example of a method of using the specimen extraction device according to the fifth embodiment, showing a state in which the inner shaft has advanced from the first position to the second position. [Figure 22] 22 is an explanatory view for explaining an example of a method of using the specimen extraction device according to the fifth embodiment, showing a state in which the inner shaft has retreated from the state shown in FIG. 21 to a first position. FIG. [Figure 23] 23 is an explanatory view for explaining an example of a method of using the specimen extraction device according to the fifth embodiment, showing a state in which the containing cylinder and the inner shaft have been removed from the body cavity from the state shown in FIG. 22. FIG. [Figure 24] 24 is an explanatory view for explaining an example of a method of using the specimen extraction device according to the fifth embodiment, showing a state in which the opening is closed from the state shown in FIG. 23.

[0062] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a specimen extraction bag according to an embodiment of the present invention will be described with reference to the drawings. The embodiment described below is merely an example to facilitate understanding of the present invention, and is not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, etc. of the components described below may be changed or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof.

[0011] It should be noted that the drawings used in this embodiment are intended to exemplify the configuration and shape of the specimen removal bag of the present invention and the arrangement of the components that make up the specimen removal bag, but are not intended to limit the present invention. Furthermore, the drawings do not necessarily accurately represent the dimensional ratios of the length, width, height, etc. of the specimen removal bag. Similarly, the drawings used in this embodiment are intended to exemplify the configuration and shape of the specimen removal device of the present invention and the arrangement of the components that make up the specimen removal device, but are not intended to limit the present invention. Furthermore, the drawings do not necessarily accurately represent the dimensional ratios of the length, width, height, etc. of the specimen removal device. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted where appropriate.

[0012] <Summary> First, an overview of the present invention will be described using a specimen extraction bag 1 according to a first embodiment as an example, mainly with reference to Fig. 1. Fig. 1 is a schematic front view showing the specimen extraction bag 1 according to the first embodiment.

[0013] As shown in Figure 1, the specimen extraction bag 1 according to the first embodiment includes a bag body 2 having a storage section 2b that stores a specimen (resection piece 10 shown in Figure 4) through an opening 2a. The bag body 2 is characterized by a downward slant from the opening 2a to a tip (rear end 2c) on the opposite side of the opening 2a.

[0014] A "specimen" refers to an organ, tissue, part of a tissue, or a combination thereof that has been removed from a human body through surgery, examination, or other means. In other words, "downward slope" means that the extension has both a component in a direction intersecting the central axis of the opening 2a and a component in a direction moving away from the opening 2a in the extension direction of the central axis.

[0015] In a procedure (thoracoscopic surgery) using the specimen removal bag 1, the specimen removal bag 1 is inserted into the body cavity through a hole (incision 30a shown in Figure 4 below, to which an incision guard 20 of a retractor (not shown) is attached) made approximately perpendicular to the extension direction of the body cavity, and the specimen (resected piece 10) is stored in the storage section 2b and removed from the body. According to the above configuration, the bag body 2 is inclined obliquely downward, which prevents the bag body 2 from coming into contact with other organs or the body wall during the above series of procedures. Furthermore, compared to conventional specimen removal bags, the bag body 2 containing the extracted specimen is prevented from protruding in a direction intersecting the perforation direction of the incision wound 30a. This makes it easier to remove the bag body 2 from the body through the incision wound 30a.

[0016] In particular, as described above, the incision 30a made in thoracoscopic surgery is made in a limited area between the ribs, and therefore the size of the hole is limited. When inserting the bag body 2 of the specimen removal bag 1 into the thoracic cavity, and when storing a specimen in the storage section 2b and removing it from the body through the incision 30a, the bag body 2 must be passed through the incision 30a, which has a limited hole size. In thoracoscopic surgery, the bag body 2 of the specimen removal bag 1 is prevented from protruding from the opening 2a, making the specimen removal bag 1 suitable for use.

[0017] First Embodiment A specimen extraction bag 1 according to a first embodiment will be described with reference mainly to FIG. The specimen removal bag 1 according to this embodiment is used to remove a specimen excised with an excision tool such as a stapler.

[0018] For example, the specimen contained in the specimen removal bag 1 is an intrathoracic organ. That is, the bag body 2 is for containing the intrathoracic organ. The intrathoracic organ to be accommodated in the specimen extraction bag 1 according to this embodiment is the lung (part of the lung (excised piece 10)). In other words, the bag body 2 is for accommodating the lung. In addition to the lungs, the "intraclavicular organs" include the trachea, bronchi, heart, aorta, vena cava, esophagus, thymus, and nerves. That is, the specimens contained in the specimen removal bag 1 include the lungs, trachea, bronchi, heart, aorta, vena cava, esophagus, thymus, nerves, or parts thereof, or combinations thereof. The specimen extraction bag 1 can suitably accommodate intrathoracic organs (specimens) during thoracoscopic surgery performed through the incision 30a. The specimen to be contained in the specimen removal bag 1 may be an organ, tissue, or part of any of these other than the intrathoracic organs.

[0019] As described above, the specimen extraction bag 1 further comprises a bag body 2 having an opening 2a and a storage section 2b for storing the excision piece 10, a string body 4 for opening and closing the opening 2a, and a storage tube 5 capable of storing the string body 4 and the bag body 2.

[0020] (Bag body) The bag body 2 according to this embodiment is made of polyurethane. The bag body 2 is formed vertically long, tapering from the base end 2d where the opening 2a is provided toward the inner end 2c. The inner end 2c is formed in a semicircular shape when viewed from the front. The material constituting the bag body 2 is preferably a material with high slipperiness so that the excision piece 10 can easily enter the storage section 2b. Examples of such materials include polyurethane, silicone, polyethylene, polypropylene, and soft polyvinyl chloride resin.

[0021] Furthermore, the material constituting the bag body 2 is preferably one that has high tear strength and flexibility, and polyurethane is a particularly preferred material, as mentioned above. By using such a material, when the specimen removal bag containing the extracted specimen is removed from the body, deformation of the bag body 2 and the specimen is promoted, and protrusion of the storage section 2b can be further suppressed. This makes it easier to remove the bag body 2 from the body, even with a small incision. In particular, it is preferable that the bag body 2 has elasticity (flexibility) in the depth direction. Specifically, it is preferable that the bag body 2 has elasticity to a degree that can allow deformation of the resected piece 10 in the depth direction when the bag body 2 containing the resected piece 10 (specimen) passes between the ribs and through the incision 30a and is removed to the outside of the body cavity. That is, it is preferable that the bag body 2 can tolerate deformation such that the resection piece 10 becomes longer and its cross-sectional area becomes smaller. With such a configuration, the surgeon can easily pass the bag body 2 containing the resection piece 10 between the ribs and through the incision wound 30a. For example, it is preferable that the material constituting the bag body 2 has a breaking elongation of 530% or more and a tensile stress of 6±2 MPa when elongated to 100%.

[0022] Furthermore, it is preferable that the inner surface of the bag body 2 is subjected to a release treatment using a coating agent such as a fluorine coating so that the excision piece 10 can slide smoothly and be properly stored by sliding it all the way to the inner end 2c of the storage section 2b.

[0023] In particular, it is preferable that a water-repellent coating such as a fluorine coating or a silicone coating is applied to the inner surface of the bag body 2. This configuration prevents the inner surfaces of the bag body 2 from sticking together, and allows the inside of the bag body 2 to easily expand when storing the excision piece 10. The same coating may also be applied to the outer surface of the bag body 2. With this configuration, the bag body 2 will not get caught on the inner wall surface of the incision wound 30a, the ribs, etc., and can be smoothly taken in and out of the body. Furthermore, as will be described later, when storing the bag body 2 in the storage tube 5, it is possible to prevent the outer surfaces of the folded bag body 2 from sticking to each other.

[0024] The bag body 2 is configured so as to be able to be stored in the storage tube 5 by being folded. It is not necessary that the bag body 2 can be accommodated in the accommodating tube 5, and the accommodating tube 5 may be one through which only the string body 4 can pass.

[0025] The volume of the storage section 2b, which is the internal space of the bag body 2 in an expanded state, is 500 mL or more, more preferably 550 mL or more, and 1000 mL or less, more preferably 950 mL or less. According to the above configuration, the resected part of the lung can be accommodated in a suitable manner.

[0026] As shown in FIG. 1, the housing portion 2b has a smoothly bent portion 2h formed between the tip end portion (rear end portion 2c) and the opening 2a. More specifically, on the inner surface of the bag body 2 that defines the storage section 2b, a bent section 2h on the outer edge side shown in FIG. 1 is smoothly bent with respect to a virtual center of curvature. The term "bent" in the present invention includes a shape that is bent with rounded corners and is a concept that includes curvature. "Smooth" means that the curve has no bending points (points where the tangents are discontinuous), and "smoothly curved" means that the slope of the tangents at each point of the curve changes continuously, not intermittently. According to the above configuration, the smoothly curved bent portion 2h is provided, which allows the specimen (resection piece 10) to slide smoothly, and the resection piece 10 can be placed at the innermost end 2c of the storage portion 2b.

[0027] As shown in FIG. 1, the storage portion 2b has a continuous downwardly sloping portion up to the tip end (rear end portion 2c), and no portion parallel to the opening 2a is formed. According to the above configuration, the downwardly sloping portion in the storage section 2b is continuous, which facilitates the sliding of the specimen (resection piece 10), and allows the resection piece 10 to be placed at the innermost end 2c of the storage section 2b.

[0028] (hand held part) The specimen extraction bag 1 is provided with strings 4 that do not have shape memory and no elastic restoring force, and that are used to tie the opening 2a of the bag body 2. Two strings 4 are provided and are slidably passed through the holding tube 5, with the ends passing through an edge (for example, a folded portion not shown) that constitutes the opening 2a of the bag body 2. By pulling the strings 4 and shortening the length pulled out from the holding tube 5, the opening 2a of the bag body 2 can be tied.

[0029] <Modification> The bag body 2 of the specimen extraction bag 1 in the above embodiment is formed long toward the rear side (toward the rear end 2c), which is the direction in which the excision piece 10 is stored, as shown in Figure 1, but the specimen extraction bag of the present invention is not limited to being formed in this manner. Next, the bag body 42 of the specimen extraction bag 1 according to the modified example will be described with reference mainly to Fig. 2. Fig. 2 is a diagram showing the storage section 42b of the bag body 42 constituting the specimen extraction bag 1 according to the modified example, and is an explanatory diagram showing the storage section 42b in a state in which the bag body 42 has contracted and is flat (parts of the inner surfaces of the bag body 42 are in surface contact with each other). More specifically, Fig. 2 shows the inner surface portion of the bag body 42.

[0030] As shown in FIG. 2, in the bag body 42 according to this example, the length W in a direction parallel to one direction on an imaginary plane including the opening 2a is longer than the length L2 in a direction perpendicular to the opening 2a. In other words, the bag body 42 of the specimen extraction bag 1 according to this embodiment is formed in a horizontally elongated shape.

[0031] "Length W in the parallel direction" and "Length L2 in the vertical direction" refer to the size of each directional component in the entire bag body 42, and do not refer to the length of the portion extending parallel or the length of the portion extending vertically. According to the above configuration, when the specimen extraction bag 1 is inserted into the abdominal cavity, the specimen extraction bag 1 can be placed along the abdominal cavity. The length W, which is the width of the storage section 42b in this example, is preferably 250 mm or more, more preferably 300 mm or more, and 400 mm or less, more preferably 350 mm or less, for example, 320 mm. The length L2 of the storage section 42b is preferably 150 mm or more, more preferably 210 mm or more, and 300 mm or less, more preferably 230 mm or less.

[0032] The opening 2a in this example is formed in an elliptical shape, and the size of the opening 2a is such that the minor axis is 30 mm or more, more preferably 50 mm or more and 100 mm or less, more preferably 90 mm or less, for example 80 mm, and the major axis is 80 mm or more and 200 mm or less, more preferably 180 mm or less, for example 160 mm. The opening area of ​​opening 2a is 60cm 2 More than 70cm, preferably 2 More than 75cm, more preferably 2 Over 120cm 2 Less than 100cm, preferably 2 Less than 90cm, more preferably 2 The following is the result.

[0033] According to the above configuration, the opening area of ​​the opening 2a is 60 cm 2 This allows the resected part of the lung to be passed through the opening 2a in a suitable manner. 2 This makes it easier to pass through the incision 30a. Furthermore, the opening 2a is deformable, and the shape of the opening 2a is not limited to an elliptical shape.

[0034] The perimeter of opening 2a is 160 mm or more, more preferably 300 mm or more, even more preferably 320 mm or more, and 400 mm or less, more preferably 380 mm or less, and even more preferably 340 mm or less. Note that if a stretchable material is used for storage section 42b, the perimeter of opening 2a represents the length in a state where no external force is applied (natural state). When the bag body 42 is expanded in the radial direction with the center line C as the reference, the opening 2a portion has an elliptical shape, and the other portions are formed to have a circular cross section.

[0035] As shown in FIG. 2, the bag body 42 has an inner edge 2p close to the bending center on the inner surface of the bag body 42, and an outer edge 2q away from the bending center. As shown in Fig. 2, the upper inner edge LA on the opening side of the inner edge 2p of the storage portion 42b extends vertically downward from the opening 2a by a length L1. The inner edge 2p of the storage portion 42b bends from the upper inner edge LA toward the rear end 2c. The length L1 is 60 mm or more, preferably 80 mm or more, and 120 mm or less, preferably 100 mm or less, for example, 90 mm. Here, "inner edge 2p" refers to the side edge that defines the storage section 42b of the bag body 42 and is closer to the center of the approximate circle that contacts the curved portion of the side edge, and "outer edge 2q" refers to the side edge that is farther from the center of the approximate circle that contacts the curved portion of the side edge.

[0036] The inner edge 2p according to this example has at least one discontinuous point P1 where the curvature is discontinuous. In the storage section 42b when the bag body 42 is inflated, the area of ​​a cross section A1 parallel to the opening 2a including the point (discontinuous point P1) closest to the opening among the discontinuous points is 40 cm 2 More than 50cm, preferably 50cm 2 More than 80cm 2 Less than 70cm, preferably 2 The following is the result. Regarding the "discontinuous curvature," in the inner edge 2p according to this embodiment shown in Figure 2, the upper inner edge LA, which extends linearly, and the lower inner edge LB, which extends curvedly, are connected, thereby forming a discontinuous curvature. In other words, the "discontinuous curvature" includes a configuration in which a straight line with zero curvature is connected to a curve with some curvature.

[0037] On the other hand, the inner edge 2p where the discontinuity point P1 is provided is not limited to being formed by an upper inner edge LA that extends linearly and a lower inner edge LB that extends curvedly, but may be formed by connecting multiple curves with different curvatures. In other words, the inner edge 2p may be formed by a curve as a whole.

[0038] According to the above configuration, the area of ​​the cross section A1 is 40 cm 2This makes it easier to accommodate the resected lung portion below cross section A1. The lung portion located below cross section A1 reaches below discontinuity point P1 and reduces in diameter while changing direction toward innermost end 2c, so that the lung portion can be suitably accommodated toward innermost end 2c. On the other hand, the area of ​​cross section A1 is 80 cm 2 By setting the length to be equal to or less than this, the bulkiness of the bag body 42 can be suppressed, and the bag body 42 can be easily passed through the incision 30a even when a part of the lung is accommodated in the bag body 42.

[0039] When the bag body 42 is inflated, the area of ​​a cross section A2 perpendicular to the center line C of the storage section 42b, including the discontinuity point P1 shown in FIG. 2, is 25 cm 2 More than 30cm, preferably 2 Over 45cm 2 Less than 40cm, preferably 2 The following is the result. Here, when there are multiple discontinuities in the inner edge 2p, the cross section A2 is the plane including the discontinuity P1 closest to the opening. In this embodiment, the diameter (major axis) of the cross section A2 when the bag body 42 is inflated is 40 mm or more, preferably 50 mm or more, and 80 mm or less, preferably 70 mm or less, for example, approximately 67 mm. According to the above configuration, the area of ​​the cross section A2 is 25 cm 2 This makes it easier to pass the resected part of the lung toward the inner end 2c. On the other hand, when the area of ​​the cross section A2 is 45 cm 2 By setting the length to be equal to or less than this, the bulkiness of the bag body 42 can be suppressed, and the bag body 42 can be easily passed through the incision 30a even when a part of the lung is accommodated in the bag body 42.

[0040] Furthermore, it is preferable that the area of ​​the cross section A1 parallel to the opening 2a be at least 1.3 times, more preferably at least 2 times, and not more than 4 times, more preferably not more than 3 times the area of ​​the cross section A2 perpendicular to the center line C of the storage section 42b including the point of the discontinuity P1 in the storage section 42b that is closest to the opening 2a. According to the above configuration, the area of ​​cross section A1 is 1.3 times or more the area of ​​cross section A2, so that the resected lung portion can be suitably compressed and deformed. Furthermore, the area of ​​cross section A1 is 4 times or less the area of ​​cross section A2, so that a sudden change in cross-sectional area can be suppressed, and the resected lung portion can be smoothly sent to the innermost portion 2c.

[0041] 2, the outer edge 2q of the side edge of the storage section 42b of the bag body 42 is formed by curves with two radii of curvature R1 and R2, and the lower inner edge LB of the inner edge 2p is formed by a single radius of curvature R3. The portion formed by the radii of curvature R1 and R2 is called the bent portion 2i. The radius of curvature R2 is larger than the radius of curvature R1.

[0042] For example, in this embodiment, when the bag body 42 is in a contracted state, the radius of curvature R1 is 180 mm or more, preferably 200 mm or more, and 240 mm or less, preferably 220 mm or less, for example, 210 mm. The radius of curvature R2 is 300 mm or more, preferably 320 mm or more, and 360 mm or less, preferably 340 mm or less, for example, 330 mm. The radius of curvature R3 is 100 mm or more, preferably 120 mm or more, and 180 mm or less, preferably 160 mm or less, for example, 140 mm.

[0043] 2, the innermost end 2c of the housing portion 42b is formed to have a semicircular (partially arcuate) cross section with a diameter D2. The housing portion 42b is formed so that the width between the bent portion (lower inner edge LB) on the inner edge 2p side, which is formed with a curvature radius R3, and the bent portion 2i on the outer edge 2q side, continuously decreases up to the innermost end 2c. By forming the storage portion 42b in this manner, the excision piece 10 can be smoothly stored up to the innermost end 2c of the storage portion 42b.

[0044] In this example, the housing portion 42b has been described as having a discontinuous point P1 on the inner edge 2p where the curvature is discontinuous, but the present invention is not limited to this configuration. In other words, the inner edge 2p may have a continuous curvature without the discontinuous point P1.

[0045] Regardless of the presence or absence of discontinuity P1, it is preferable that the circumferential length of the inner surface of storage section 42b intersecting with the cross section perpendicular to center line C of storage section 42b decreases from opening 2a to the tip end portion (rear end portion 2c) on the opposite side of opening 2a. Note that "decreasing" here means that the circumferential length does not increase midway (from opening 2a to the tip end portion on the opposite side of opening 2a), and also includes the existence of a range of the same circumferential length.

[0046] In an embodiment regardless of the presence or absence of discontinuity P1, center line C can be determined in a state in which storage section 42b is crushed so that bag body 42 does not overlap when in a loose state. This crushed state is a state in which inner edge 2p and outer edge 2q, which are positioned 180 degrees opposite each other when viewed perpendicular to opening 2a when opening 2a is open, are crushed in storage section 42b.

[0047] The center line C is a line that connects the midpoints of a straight line that is the shortest distance between the inner edge 2p and the outer edge 2q from the opening 2a to the tip end (rear end 2c). The perimeter of the inner surface of the housing portion 42b that intersects with a cross section perpendicular to the center line C is twice the distance between the tangent point with the inner edge 2p and the tangent point with the outer edge 2q on the line perpendicular to the center line C when the housing portion 42b is compressed. The preferred ranges for the perimeter of opening 2a and the volume of storage section 2b, which is the internal space of bag body 42, are the same as those described above. Here, the volume of storage section 2b, which is the internal space, refers to the volume when storage section 2b is in the maximally expanded state within a range in which the material of storage section 2b does not expand.

[0048] In an embodiment regardless of the presence or absence of discontinuity P1, it is preferable that the perimeter of the inner surface of bag body 42 intersecting with the cross section perpendicular to center line C at a position 20% or more, preferably 25% or more, 40% or less, and preferably 35% or less from opening 2a with respect to the length from opening 2a to the tip end (rear end 2c) on center line C is 60% or more, preferably 65% ​​or more, 80% or less, and preferably 75% or less of the perimeter of opening 2a. This makes it easy to pass a portion of the excised lung through opening 2a and to remove storage section 42b containing the lung from the incision.

[0049] Furthermore, the tip end portion (rear end portion 2c) of bag body 42 according to this embodiment is formed into a partially spherical shape with a diameter of 50 mm or more and 100 mm or less when bag body 42 is inflated. By forming rear end portion 2c in this manner, it becomes possible to smoothly store a specimen inside rear end portion 2c. The term "partial spherical" includes not only a hemispherical shape but also a shape formed by an arc with a central angle of less than 180 degrees in a longitudinal cross section. However, the present invention is not limited to this configuration, and any shape can be used as long as the specimen can be accommodated up to the tip of the innermost end 2c. Note that the diameter D2 of the bag body 42 in the expanded state according to this embodiment is approximately 35 mm.

[0050] Second Embodiment The specimen extraction bag 1 according to the above embodiment has a gently tapered inner surface of the bag body 2, which improves the slipperiness of the bag body 2 and allows the excision piece 10 to be suitably stored. However, the present invention is not limited to this configuration, and a mechanism (pushing mechanism 3) for pushing the excision piece 10 so that it is unevenly disposed in a part of the storage portion 2b may be provided.

[0051] A specimen extraction bag 1A according to a second embodiment, which is equipped with such a pushing mechanism 3, will be described mainly with reference to Figures 3 to 5. Figure 3 is a schematic front view of the specimen extraction bag 1A according to the second embodiment. Figure 4 is a schematic diagram showing a state in which a specimen (excision piece 10) is contained in the specimen extraction bag 1A, and Figure 5 is a schematic diagram showing a state in which the expansion / contraction section 3a is expanded to push the excision piece 10 toward the opening 2a. In Figures 4 and 5, the expansion / contraction section 3a is shown in a simplified manner, and in reality it is formed on the entire inner surface of the bag body 2 (or at least a portion of the inner surface), and expands like a life jacket, protruding toward the storage section 2b.

[0052] The specimen extraction bag 1A further includes a pushing mechanism 3 that pushes the excision piece 10 so that it is positioned biasedly in a portion of the storage section 2b. 4 and 5, the pushing mechanism 3 is an expansion / contraction section 3a that expands when a fluid (air in this embodiment) is supplied and contracts when the fluid is discharged. When a fluid is supplied, the expansion / contraction section 3a expands so as to narrow the storage section 2b. The expansion / contraction section 3a is provided at the tip end (rear end 2c) of the bag main body 2. The expansion / contraction section 3a is made of a flexible resin material or the like, and has a filling space that can be filled with a fluid.

[0053] Any fluid can be used as the "fluid" as long as it can be supplied to and discharged from the expansion / contraction section 3a. For example, in addition to air in this embodiment, it may also be liquid such as water or physiological saline. The inflatable / deflated portion 3a is made up of a sheet 2g attached to the inner surface of the bag body 2 with a space therebetween, and is inflated and deflated by letting air in and out of the space.

[0054] In particular, since the sheet 2g functions as the inflatable / deflated portion 3a, it is preferable that the sheet 2g has higher stretchability than the bag body 2 to which the sheet 2g is attached. For example, in order to adjust the stretchability of the sheet 2g, it is preferable to make the thickness of the sheet 2g thinner (for example, half the thickness) than the thickness of the bag body 2. However, the stretchability may be adjusted not only by adjusting the thickness of the sheet 2g but also by selecting the material that constitutes the sheet 2g.

[0055] As described above, the inflation / deflation section 3a in this embodiment is configured such that a part of the innermost end 2c of the bag body 2 is made up of two sheets 2g. When external air is supplied between the two sheets of the innermost end 2c by the rubber bulb 3b and the tube 3c (described later), the innermost sheet 2g of the two sheets juts out so as to narrow the storage section 2b.

[0056] According to the above configuration, by supplying a fluid to the expansion / contraction section 3a to expand the expansion / contraction section 3a, the storage section 2b can be narrowed and the specimen (resection piece 10) can be biased to one side (the opening 2a side in this embodiment) as shown in Fig. 5. This can favorably assist the movement of the resection piece 10 toward the opening side (outside the body). Furthermore, by discharging the fluid from the expansion / contraction section 3a, the storage section 2b for the excision piece 10 can be expanded, and in this embodiment, the excision piece 10 can be stored deep inside the storage section 2b.

[0057] 3, the specimen extraction bag 1A includes a tube 3c connected to the expansion / contraction portion 3a to supply a fluid (gas) into the expansion / contraction portion 3a. At least a portion of the tube 3c is preferably disposed along the inner surface of the bag body 2. "Along the inner surface of the bag body 2" means that it is not exposed at least on the outer surface of the bag body 2, and includes not only those that run along the inner surface of the bag body 2, but also those that are embedded within the thickness of the bag body 2 and run along the inner surface.

[0058] According to the above configuration, a part of the tube 3c is arranged along the inner surface of the bag body 2, which prevents the tube 3c from coming into contact with the surgeon's hands or surrounding objects and hindering the procedure. In addition, the tube 3c is prevented from hitting the wall of the body cavity (thoracic cavity wall), which reduces invasiveness.

[0059] As shown in FIG. 3, the specimen extraction bag 1A includes an operating part (rubber bulb 3b) that can supply a fluid (gas) to the expansion / contraction part 3a via a tube 3c. Two check valves 3d are provided in the rubber bulb 3b at positions sandwiching the expansion / contraction portion of the rubber bulb 3b. The two check valves 3d take in the fluid into the expansion / contraction portion 3a while preventing the fluid from leaking out.

[0060] The operating part capable of supplying fluid to the expansion / contraction part 3a may be a syringe or the like in addition to the rubber bulb 3b. An example of the check valve 3d is a duckbill valve, but it is not limited to a duckbill valve as long as it can prevent the fluid from leaking to the outside. In addition, a three-way stopcock (not shown) is connected to the rubber bulb 3b, and this three-way stopcock is configured to discharge the fluid in the inflation / deflation section 3a outside the body, thereby deflating the inflation / deflation section 3a. According to the above configuration, by operating the operating portion (rubber bulb 3b), gas (fluid) can be easily supplied to the expansion / contraction portion 3a.

[0061] The opening at the tip of the tube 3c to which the rubber bulb 3b is connected is directed toward the back (toward the back end 2c) of the inflation / deflation part 3a relative to the central part in the depth direction (storage direction). Therefore, the air (fluid) supplied from the tube 3c is supplied from the back side of the expansion / contraction section 3a, making it easier to apply a load to the excision piece 10 stored in the storage section 2b so as to push it toward the opening 2a.

[0062] In addition, the specimen extraction bag 1A may be provided with a string 24 (wire) shown in Figure 4 at the edge of the opening 2a instead of the string 4 shown in Figures 1 and 3, which does not have shape memory and has no elastic restoring force. That is, as shown in FIG. 4, the specimen extraction bag 1A further includes a string 24 attached to the edge of the opening 2a, and it is preferable that the string 24 has shape memory so that the opening is in an open state. According to the above configuration, the string 24 has shape memory so that the opening 2a is in an open state, so that simply by pulling out the string 24 from the storage tube 5, the opening 2a opens without any special operation, making it easier to store the specimen (resection piece 10) in the body cavity (thoracic cavity).

[0063] As shown in Figure 3, the specimen extraction bag 1A according to this embodiment further includes a handle (comprised of string 4 or string 24 and storage tube 5) that is grasped by the user and can open and close the opening 2a of the bag body 2. The handle (string 4) is pulled out to one side of the bag body 2 (one side on an imaginary plane including the opening 2a). The tip end (rear end 2c) provided on the bag body 2 is positioned to one side of the opening 2a.

[0064] That is, the bag body 2 is bent at the bent portion 2h so that the inner end portion 2c of the bag body 2 is positioned in the direction in which the string body 4 is pulled out from the bag body 2. It should be noted that the "handle portion" according to the present invention does not necessarily have the above-described function of opening and closing the opening 2a of the bag body 2. For example, it may be a rod-shaped portion simply attached to the bag body 2 without such a function.

[0065] According to the above configuration, as shown in Figure 4, when the handle (storage tube 5) is grasped and the specimen extraction bag 1 is inserted into the body cavity through the incision 30a, the bag body 2 is bent toward the handle (storage tube 5), allowing the bag body 2 to be positioned along the inner surface of the body wall 30.

[0066] Therefore, the bag body 2 can be widely positioned within the body cavity, which extends longer in the length direction of the body (left and right direction in Figure 4) than in the thickness direction of the body (up and down direction in Figure 4), making it easier to store the excision piece 10 in the bag body 2 and suitable for retrieving the excision piece 10.

[0067] However, the present invention is not limited to this configuration, and does not exclude a bag body 2 bent in a different direction relative to the handle (string 4 and holding tube 5) side, as shown in Fig. 1. The bag body 2 should be at least inclined diagonally downward from the opening 2a to the tip (rear end 2c) on the opposite side of the opening 2a. A specimen extraction bag 1 including such a bag body 2 makes it easier to place the bag body 2 more widely within a body cavity than one that extends in a direction perpendicular to an imaginary plane including the opening 2a.

[0068] <Third embodiment> Although the inflatable / deflated portion 3a according to the above embodiment has been described as being provided on the inner end portion 2c side of the bag body 2, the present invention is not limited to this configuration. Next, a specimen extraction bag 1B according to a third embodiment, which includes an expansion / contraction section 13a provided on the side near the opening 2a of the bag body 2 (on the side of the base end 2d), will be described with reference mainly to FIG.

[0069] FIG. 6 is a schematic front view showing a specimen extraction bag 1B with a filter 14 according to the third embodiment. 6, the expansion / contraction section 13a provided in the specimen extraction bag 1B according to this embodiment is different from the expansion / contraction section 3a according to the second embodiment in that it is provided near the opening 2a of the bag body 2. When a fluid (gas) is supplied to the expansion / contraction section 13a, the expansion / contraction section 13a expands so as to narrow the area near the opening 2a of the storage section 2b.

[0070] The "vicinity of the opening 2a of the bag main body 2" where the expansion / contraction section 13a is provided means that it is at least closer to the opening 2a than the center in the storage direction in the bag main body 2. If the "vicinity of the opening 2a of the bag main body 2" where the expansion / contraction section 13a is provided is within a range of 1 / 3 of the distance toward the opening 2a in the depth direction (storage direction) of the storage section 2b, this is preferable because it makes it easier to apply a load in the depth direction to the excision piece 10 stored in the storage section 2b.

[0071] According to the above configuration, by supplying fluid to the expansion / contraction section 13a, the vicinity of the opening 2a of the storage section 2b is narrowed, and the specimen (excision piece 10) can be pushed deep into the storage section 2b. Furthermore, by discharging fluid from the expansion / contraction section 13a, the bag body 2 can be contracted, making it easier to remove the excision piece 10 contained in the bag body 2 from the body, and also easier to remove the specimen removal bag 1B from the body together with the excision piece 10.

[0072] As shown in FIG. 6, the bag body 2 has a flared portion 2f near the opening 2a that becomes wider from the inner side of the storage section 2b (the inner end 2c side) toward the opening 2a. The inflatable / deflated portion 13a according to this embodiment is formed in the flared portion 2f of the bag body 2. In particular, it is preferable that the expansion / contraction portion 13a is formed so that the width of the internal space surrounding the expansion / contraction portion 13a when the expansion / contraction portion 13a is cut in a direction perpendicular to the depth direction of the bag body 2 increases as it moves toward the opening 2a of the storage portion 2b.

[0073] Furthermore, the tube 3c to which the rubber bulb 3b is connected is connected to the expansion / contraction section 13a on the opening 2a side rather than the central portion in the depth direction. Therefore, the air (fluid) supplied from the tube 3c is supplied from the opening 2a side of the expansion / contraction section 13a, making it easier to apply a load to the excision piece 10 stored in the storage section 2b so as to push it deeper into the storage section 2b.

[0074] As shown in Fig. 6, a discharge opening 15 that connects the storage section 2b to the outside is provided at the inner end 2c of the bag body 2 on the opposite side from the opening 2a. The discharge opening 15 is closed by a filter 14 that allows gas to pass but not liquid to pass through. It is preferable that the filter 14 be a hydrophobic filter. "To make the liquid impermeable" means to make the liquid (blood) not leak out when pressurized to the extent that the expansion / contraction section 13a expands.

[0075] According to the above configuration, an exhaust opening 15 is provided so that gas can be exhausted to the outside (outside the storage section 2b), and this prevents the internal pressure of the storage section 2b from increasing and interfering with the pushing of the specimen (excision piece 10) when the pushing mechanism 13 pushes the specimen (excision piece 10) deep into the bag body 2. Furthermore, by providing the filter 14 at the discharge opening 15, it is possible to prevent a part of the excised piece 10 and body fluids such as blood from leaking out of the bag body 2.

[0076] A pulling string 17 is attached to the end of the bag body 2 that is pushed in by the pushing mechanism 13. A ring 17a is attached to the base end of the traction string 17. The surgeon can hook his / her finger on this ring 17a and pull out the inner end 2c of the bag body 2 toward the incision wound 30a.

[0077] According to the above configuration, a traction string 17 is attached to the end of the bag body 2 that is pushed into by the pushing mechanism 13, making it easier to remove the specimen (excision piece 10) that is stored in a thin state at the end of the pushing, as described below, from the side of the traction string 17 into the body.

[0078] <Fourth embodiment> In the above embodiment, a configuration has been described in which, when the excision piece 10 is pushed into the inner end 2c of the storage portion 2b, air at the inner end 2c is released through the exhaust opening 15, but the present invention is not limited to such a configuration. Next, a specimen extraction bag 1C according to a fourth embodiment, which is provided with a lumen 16, will be described with reference mainly to FIG. FIG. 7 is a schematic explanatory view showing a specimen extraction bag 1C according to the fourth embodiment.

[0079] As shown in Figure 7, the bag body 2 of the specimen extraction bag 1C of this embodiment is provided with a lumen 16 that extends from the inner end 2c of the storage section 2b to the base end 2d on the opening 2a side, and allows gas in the storage section 2b to pass through to the opening 2a. The lumen 16 does not include a tube (not shown) that is provided separately from the bag body 2 and attached to the bag body 2, but is formed in the bag body 2 itself by heat sealing, adhesion, or the like.

[0080] According to the above configuration, when the pushing mechanism 13 pushes the excision piece 10 into the innermost end 2c of the storage section 2b, gas can be released from the innermost end 2c to the base end 2d via the lumen 16. This prevents the internal pressure of the storage section 2b from increasing due to the pressure of the pushing mechanism 13, which would otherwise interfere with the pushing of the excision piece 10, and prevents part of the excision piece 10, blood, etc. from leaking out of the bag main body 2.

[0081] 7, the bag body 2 has a flared portion 2f near the opening 2a that becomes wider from the inner side (the inner end 2c side) of the storage portion 2b toward the opening 2a. It is preferable that the base end 16a of the lumen 16 extends along the flared portion 2f. That is, the lumen 16 is formed so that the portion formed in the flared portion 2f is wider in the diameter direction than the portion formed in the storage portion 2b in which the excision piece 10 is accommodated.

[0082] According to the above configuration, when the resection piece 10 is placed in the center of the opening 2a, the base end 16a of the lumen 16, which serves as an escape port for air, extends along the flared portion 2f, so that when the specimen (resection piece 10) is placed in the center of the opening, a gap is likely to form between the lumen 16 and the resection piece 10. Therefore, the resection piece 10 is less likely to block the lumen 16.

[0083] As shown in FIG. 7, it is preferable that a plurality of lumens 16 (two in this embodiment) are provided facing each other across the center of the storage section 2b. According to the above configuration, even if the specimen (excision piece 10) is unevenly placed in the storage section 2b and one lumen 16 is blocked by the specimen, the other lumen 16 can maintain the return of gas to the base end side.

[0084] As shown in FIG. 7, the bent portion 2h is bent in the in-plane direction connecting the two lumens 16 that face each other across the center of the storage portion 2b. In this embodiment, the bent portion 2h is bent in a direction away from the side where the housing tube 5 is disposed, but it may be bent toward the side where the housing tube 5 is disposed. According to the above configuration, the bent portion 2h is bent in the in-plane direction connecting the two opposing lumens 16, so that the bent shape and the lumens 16 can be formed at the same time by heat sealing.

[0085] The bag body 2 is made of a resin film (for example, a sheet material made of polyurethane). The bag body 2 is made, for example, by overlapping two sheets of sheet material and joining parts of them together. The front side of the bag body 2 is made of one of the two sheet materials, and the back side of the bag body 2 is made of the other of the two sheet materials. The lumen 16 is preferably formed by heat-sealing portions of two sheets of material constituting the bag body 2 in a line. As described above, the bag body 2 may be formed from silicone, polyethylene, polypropylene, soft polyvinyl chloride resin, or the like, in addition to polyurethane.

[0086] According to the above configuration, the lumen 16 can be easily formed by overlapping two sheets of sheet material and heat sealing (high frequency welding). However, the lumen 16 may be a small hole formed within the thickness of the bag body 2 without using heat sealing. In addition, when the bag body 2 is formed by heat sealing using two sheets of sheet material, the inner surfaces of the two sheets of sheet material may be thermally welded together at a position sandwiching the storage section 2b of the bag body 2, and a fin (not shown) may be provided that protrudes outward further than other parts.

[0087] It is optional whether or not to provide the pushing mechanisms 3, 13. For example, if the bag body 2 has good slipperiness, the pushing mechanisms 3, 13 are not necessarily required. In order to improve slipperiness, it is possible to use, for example, a polyurethane sheet or to apply a release treatment (coating).

[0088] Fifth Embodiment Next, a specimen retrieval device 100 according to a fifth embodiment will be described with reference to Figures 8 to 24. Figure 8 is a cross-sectional view taken along a line corresponding to line AA shown in Figure 13. In the following description, the tip end side (left side in FIG. 8) of the specimen extraction device 100 will be referred to as the distal side, and its base end side (right side in FIG. 8) will be referred to as the proximal side. The distal end refers to a certain range including the distal end (the most distal end) and its surroundings, and the proximal end refers to a certain range including the proximal end (the most proximal end) and its surroundings.

[0089] As shown in Figure 8 and other figures, the specimen extraction device 100 according to this embodiment includes the specimen extraction bag (1, 1A, 1B, 1C) of the present invention. Note that in the example shown in Figure 8 and other figures, the bag body is shown as the bag body 42 in the above-mentioned modified example, but the present invention is not limited to this example, and the bag body 2 in the first to fourth embodiments may also be used. Also, the specimen extraction bag 1 is not shown in Figures 9 and 11. The specimen extraction device 100 is configured so that the opening 2a of the bag body 42 can be opened (see FIG. 21) and the opening 2a can be closed (see FIG. 24) from the open state. In the present invention, the open state of the opening 2a means a state in which the opening area of ​​the opening 2a is secured to an extent that at least specimens can be put in and taken out of the inside of the bag body 42, and is not necessarily limited to a state in which the opening area of ​​the opening 2a is at its maximum. Furthermore, in the present invention, the closed state of the opening 2a means a state in which the opening area of ​​the opening 2a is reduced compared to the above-mentioned open state, at least to the extent that the insertion and removal of specimens from inside the bag body 42 is restricted, and is not necessarily limited to a state in which the opening area of ​​the opening 2a is at its smallest (a state in which the bag body 42 is completely sealed). The opening area of ​​the opening 2a referred to here is the area of ​​a region defined by the edges that constitute the opening 2a in an imaginary plane that includes the opening 2a. With this configuration, the opening 2a of the bag body 42 can be easily opened and closed within the body cavity (thoracic cavity), making it easier to store the specimen (resected piece 10). This makes it easier to remove the extracted specimen from the body while it is still stored in the specimen removal bag 1.

[0090] As shown in Figures 10 and 12, the specimen extraction device 100 includes an extrusion operation portion 162 having a holding tube 110, a gripping portion 120 fixed to the proximal end of the holding tube 110, and an inner shaft 130 axially slidably inserted through the holding tube 110. The inner shaft 130 can move forward in the axial direction from a first position (see Figures 10 and 12, etc.) in which the bag body 42 is accommodated in the accommodating tube 110 to a second position (see Figures 9 and 11, etc.) in which the bag body 42 is pushed out of the accommodating tube 110.

[0091] With this configuration, the bag body 42 can be easily inserted into the body cavity through the accommodating tube 110, and after being inserted into the body cavity, the bag body 42 can be quickly pushed out from the accommodating tube 110 inside the body cavity.

[0092] As shown in Figures 9 and 11, the specimen extraction device 100 includes an opening operation section 164 having a storage tube 110, a gripping section 120 fixed to the proximal end of the storage tube 110, an inner shaft 130 axially slidably inserted through the storage tube 110, and a pair of elastic pieces 140 whose distal ends are open in the natural state (see Figures 9 and 11, etc.). A pair of elastic pieces 140 are fixed to the distal end of the inner shaft 130 and hold the vicinity of the opening 2a. The inner shaft 130 can be advanced in the axial direction from a first position (see Figures 10 and 12, etc.) in which the pair of elastic pieces 140 are housed within the accommodating tube 110 to a second position (see Figures 9 and 11, etc.) in which the pair of elastic pieces 140 are exposed from the accommodating tube 110 and in their natural state. By advancing the inner shaft 130 to the second position, the opening 2a can be elastically opened to an open state.

[0093] According to this configuration, the opening 2a of the bag body 42 can be easily opened in the body cavity, and the open state of the opening 2a can be maintained. It should be noted that the "natural state" here means a state in which the pair of elastic pieces 140 are released from at least the constraint of the storage tube 110, and the pair of elastic pieces 140 may be elastically deformed, for example, by the constraint force of the pair of string-passing portions 2ra or the fixing member 132 described below.

[0094] In this embodiment, the containing tube 110 , the gripping portion 120 , the inner shaft 130 and the pair of elastic pieces 140 of the specimen extraction device 100 serve as both the pushing operation portion 162 and the opening operation portion 164 . In addition, in this embodiment, the first position of the extrusion operation portion 162 and the first position of the opening operation portion 164 are the same position, and the second position of the extrusion operation portion 162 and the second position of the opening operation portion 164 are the same position.

[0095] Therefore, when the inner shaft 130 is in the first position, the pair of elastic pieces 140 and the bag body 42 are housed in the housing tube 110. By advancing the inner shaft 130 to the second position, the bag body 42 together with the pair of elastic pieces 140 can be pushed out of the housing tube 110, and the opening 2a can be elastically opened to an open state.

[0096] With this configuration, the operation of pushing the bag body 42 out of the storage tube 110 and the operation of opening the opening 2a can be performed in conjunction with each other within the body cavity. Therefore, the specimen (resection piece 10) can be quickly stored in the bag body 42. However, the present invention is not limited to this example, and for example, the first position of the extrusion operation portion 162 and the first position of the opening operation portion 164 may be different positions, and the second position of the extrusion operation portion 162 and the second position of the opening operation portion 164 may be different positions. That is, in the axial direction, the position where the bag main body 42 is housed in the accommodating tube 110 and the position where the pair of elastic pieces 140 are housed in the accommodating tube 110 may be different from each other. Similarly, in the axial direction, the position where the bag main body 42 is exposed from the accommodating tube 110 and the position where the pair of elastic pieces 140 are exposed from the accommodating tube 110 may be different from each other.

[0097] When the inner shaft 130 is in the first position, the pair of elastic pieces 140 are restrained by the accommodating tube 110 and are accommodated in the accommodating tube 110 together with the bag main body 42 with their distal ends closed against the elastic restoring force of the elastic pieces 140. From this state, the inner shaft 130 is advanced to the second position, causing the distal end of the inner shaft 130 and therefore the pair of elastic pieces 140 to be exposed from the accommodating tube 110, thereby pushing the bag main body 42 out of the accommodating tube 110 and elastically deforming the pair of elastic pieces 140 from the closed state to an open state (natural state), thereby elastically opening the opening 2a held by the pair of elastic pieces 140 to an open state.

[0098] However, in the present invention, the specimen extraction device 100 does not necessarily have to include the above-mentioned push-out operation unit 162. In this case, the bag body 42 may be configured to be pulled out of the storage tube 110 by, for example, the elastic restoring force of a pair of elastic pieces 140 exposed from the storage tube 110, or the surgeon (user) may pinch a part of the bag body 42 or a part of the string body 4 and pull it out of the storage tube 110. Similarly, in the present invention, the specimen retrieval device 100 may not include the opening operation unit 164. In this case, for example, the specimen retrieval device 100 may include a pair of arms (not shown) that swing and switch between a distal end open state and a distal end closed state in response to an operation by an operator (user). The pair of arms hold the vicinity of the opening 2a, and the opening 2a is opened when the pair of arms are opened. Alternatively, as in the second embodiment described above, the opening 2a of the bag body 42 may be configured to be opened by the elastic restoring force of a string made of wire.

[0099] In the following description, the axial direction of the accommodating tube 110 may be simply referred to as the axial direction, the radial direction of the accommodating tube 110 may be simply referred to as the radial direction, and the circumferential direction of the accommodating tube 110 may be simply referred to as the circumferential direction. Furthermore, unless otherwise specified, the description of the shape of each part of the pair of elastic pieces 140 is a description of the shape in a natural state when no external force is applied.

[0100] As shown in Figure 8, in this embodiment, the specimen extraction bag 1 also has a string 4 attached to the edge of the opening 2a, and the string 4 is configured to be able to close the opening 2a. As shown in FIG. 17(a) and other figures, the bag body 42 has a pair of string-insertion portions 2ra formed on one side and the other side of the edge of the opening 2a, through which the string 4 is inserted. One of the pair of elastic pieces 140 is inserted into one of the pair of string-passing portions 2ra, and the other of the pair of elastic pieces 140 is inserted into the other of the pair of string-passing portions 2ra.

[0101] With this configuration, one side and the other side of the edge of the opening 2a are sufficiently spaced apart and the spaced apart state can be maintained by the pair of elastic pieces 140. Therefore, the opening 2a can be opened with a sufficient opening diameter and the opening diameter can be maintained well.

[0102] More specifically, as described above, the bag body 42 has an opening 2a and includes a storage section 42b that stores the excision piece 10. In the present embodiment, the storage section 42b is configured by a portion of the bag body 42 that is closer to the tip end (rear end 2c) than the pair of string-passing sections 2ra. Also in this embodiment, the bag body 42 is made up of two sheets. In one of the two sheets, a portion that forms one side of the edge of the opening 2a is folded back to form one string-passing portion 2ra. Similarly, in the other of the two sheets, a portion that forms the other side of the edge of the opening 2a is folded back to form the other string-passing portion 2ra. The elastic piece 140 is inserted into the string-insertion portion 2ra through an opening 2raa on one end side of the string-insertion portion 2ra (one end in the longitudinal direction of the string-insertion portion 2ra).

[0103] As shown in FIG. 17(b) and other figures, a part of the string body 4 serves as a lead-out portion 4b that is led out from the pair of string-insertion portions 2ra. A part of the lead-out portion 4b is introduced into the inside of the housing tube 110 and forms the loop portion 4a. The lead-out portion 4b is led out toward the storage tube 110 through an opening 2raa at one end side of each of the pair of string-insertion portions 2ra.

[0104] Furthermore, as shown in Figures 17(a) and 17(b), in this embodiment, the specimen extraction bag 1 is provided with a fastener 50 formed in a cylindrical shape. One end of the string body 4, which is led out from one string-passing portion 2ra to the side of the inner shaft 130, and the other end of the string body 4, which is led out from the other string-passing portion 2ra to the side of the inner shaft 130, are each slidably inserted into the fastener 50.

[0105] According to this configuration, after the specimen is contained in the bag body 42, the opening 2a can be easily closed and the closed state of the opening 2a can be maintained.

[0106] The fastener 50 is slidable relative to the string 4 in both a direction approaching the opening 2a (a direction away from the inner shaft 130) and a direction away from the opening 2a (a direction approaching the inner shaft 130). By sliding the fastener 50 relative to the string 4 in a direction approaching the opening 2a (string-passing portion 2ra), the opening 2a can be narrowed and the opening area can be reduced. In this way, the opening 2a can finally be brought into a closed state, like a drawstring bag. Furthermore, by sliding the fastener 50 relative to the string 4 in a direction away from the opening 2a (string-passing portion 2ra), the opening area of ​​the opening 2a in the closed state can be increased. In this way, the opening 2a can finally be brought into an open state. However, the present invention is not limited to this example, and the specimen retrieval device 100 does not necessarily have to include the fastener 50 .

[0107] The pair of elastic pieces 140 are elastically deformable so as to have a self-expanding force. The pair of elastic pieces 140, which are in a closed state within the housing tube 110, naturally expand and open by protruding from the housing tube 110. Here, "self-expanding" means that they will open on their own in reaction to an external force that tries to close them. In this embodiment, the pair of elastic pieces 140 are formed to have the same shape and dimensions as each other. However, in the present invention, the pair of elastic pieces 140 may be formed to have different shapes and dimensions from each other.

[0108] As shown in Figures 9 and 11, the elastic piece 140 is formed in a plate shape, and has an arcuate curved portion 142 that curves in an arc in a direction toward the distal end toward the other elastic piece 140, a distal portion 144 connected to the distal end side of the arcuate curved portion 142, and a distal-most end portion 146 connected to the distal side of the distal portion 144. In a natural state, the most distal end 146 of one elastic piece 140 extends in a direction away from the most distal end 146 of the other elastic piece 140 toward the distal end side and in a direction intersecting the axial direction.

[0109] With this configuration, it is possible to moderately soften the contact of the distal end 146 of the elastic piece 140 with the bag body 42 when the inner shaft 130 is advanced from the first position to the second position. The term "natural state" used here means a state in which no external force is applied.

[0110] In this embodiment, the pair of elastic pieces 140 are arranged symmetrically at 180 degrees in the radial direction with respect to the axial center of the accommodating tube 110. More specifically, with respect to the axial center of the accommodating tube 110, one elastic piece 140 is arranged on one side in the radial direction, and the other elastic piece 140 is arranged on the opposite side (the other side) from the one side in the radial direction. In addition to the arcuate curved portion 142 , the distal portion 144 and the most distal end portion 146 , the elastic piece 140 further has a most proximal end portion (not shown) connected to the proximal side of the arcuate curved portion 142 . The most proximal end is fixed to the distal end of the inner shaft 130 by a fixing member 132. As shown in Figures 17(a) and 17(b), a groove-shaped insertion portion 134 extending in the axial direction is formed in a portion of the outer circumferential surface of the fixing member 132. The lead-out portion 4b of the cord body 4 passes through the insertion portion 134 and is introduced further proximally. The elastic piece 140 has a portion (the arcuate curved portion 142, the distal portion 144, and the distalmost end portion 146) excluding the proximalmost end portion inserted into the string-passing portion 2ra. When the inner shaft 130 advances from the first position to the second position, the arcuate curved portion 142, the distal portion 144, and the distalmost end portion 146 are exposed from the housing tube 110. 17(b), the distal end of the most distal end 146 gradually narrows toward the distal side and has a rounded shape, which can further soften the contact of the most distal end 146 of the elastic piece 140 with the bag body 42.

[0111] When the pair of elastic pieces 140 are housed in the housing tube 110 (closed state), the boundary between the arcuate curved portion 142 and the distal portion 144 or its vicinity abuts against the inner circumferential surface of the housing tube 110. Furthermore, when housed inside the housing tube 110 (same as above), the distalmost ends 146 of the pair of elastic pieces 140 extend parallel to each other. Note that "parallel" here means, for example, that the angle formed by the extension lines (not shown) of the distalmost ends 146 of the pair of elastic pieces 140 is less than 45 degrees. With this configuration, it is possible to prevent the distal end portion 146 from getting caught on the inner circumferential surface of the housing tube 110, and to allow the elastic piece 140 to be exposed from the housing tube 110 smoothly.

[0112] Each of the pair of elastic pieces 140 is made of a superelastic alloy such as nitinol. The thickness of each of the pair of elastic pieces 140 is preferably, for example, 0.1 mm or more and 1.0 mm or less, and more preferably 0.3 mm or more and 0.5 mm or less. The width of the pair of elastic pieces 140 (the dimension in the direction perpendicular to the extending direction of the elastic pieces 140) is preferably, for example, 2 mm or more and 8 mm or less, and more preferably 3 mm or more and 5 mm or less.

[0113] The housing tube 110 is formed, for example, in the shape of a hollow tube that is long in one direction and has openings at both the distal end and the proximal end. The inner shaft 130 is inserted into the inner cavity of the housing tube 110 and is slidable in the axial direction relative to the housing tube 110. More specifically, when the inner shaft 130 advances from the first position to the second position, the pair of elastic pieces 140 (and the bag body 42) are exposed to the outside from the openings on the distal end side of the housing tube 110 (protrude distally). In this embodiment, the inner and outer diameters of the casing tube 110 are constant regardless of the position in the axial direction, but the outer and inner diameters of the casing tube 110 may differ depending on the position in the axial direction.

[0114] 8 and other figures, the gripping portion 120 is, for example, a hollow member, and is formed, for example, in the shape of a cylinder that is long in one direction. The gripping portion 120 is fitted onto the proximal end of the casing tube 110, and the inner cavity of the gripping portion 120 communicates with the inner cavity of the casing tube 110. More specifically, when the inner shaft 130 is retracted from the second position, the proximal end of the inner shaft 130 (more specifically, the holding portion 135, which will be described later) passes through the inner cavity of the casing tube 110 and is exposed to the outside from a proximal opening 122 of the gripping portion 120 (protrudes proximally). As shown in FIGS. 18(a) to 18(c), etc., the proximal end portion 121a of the grip portion 120 has a larger diameter than the other portions of the grip portion 120.

[0115] The housing cylinder 110 is made of a metal material such as stainless steel (SUS), and the gripping portion 120 is made of a resin material such as polyurethane or polyamide. The outer diameter of the housing tube 110 is not particularly limited, but is preferably 8 mm or more and 14 mm or less. The inner diameter of the housing tube 110 is not particularly limited, but is preferably 9 mm or more and 13 mm or less. Furthermore, the total length of the housing tube 110 is not particularly limited, but is preferably 200 mm or more and 400 mm or less.

[0116] As shown in FIGS. 18(a) to 18(c), in this embodiment, an uneven shape 126 is formed on at least a part of the outer circumferential surface of the grip portion 120. According to this configuration, the uneven shape 126 can be used as a slip prevention, so that the surgeon can grip the grip portion 120 well. 18(b) is a plan view seen in the direction of arrow A shown in FIG. 18(a), and FIG. 18(c) is a rear view seen in the direction of arrow B shown in FIG. 18(a).

[0117] A part of the outer peripheral surface of the grip part 120 constitutes a flat part 125. The normal direction of the flat part 125 is the same direction as the direction perpendicular to the direction in which the pair of elastic pieces 140 are arranged. According to this configuration, the orientation of opening 2a can be easily grasped using the orientation (normal direction) of the surface of flat portion 125 as an index. In particular, since gripping portion 120 can be configured so that flat portion 125 and other portions have different tactile sensations, the surgeon can grasp the orientation of opening 2a based on this difference in tactile sensation.

[0118] The flat surface portion 125 is formed flat except for an area where a plurality of protrusions 126a, which will be described later, are formed. The flat surface portion 125 is formed in the middle portion in the axial direction of the grip portion 120. The flat surface portion 125 extends along the axial direction. Furthermore, in this embodiment, distal end 125a of flat portion 125 is slightly displaced radially outward toward the distal side. With this configuration, when a thumb is placed on flat portion 125, the tip of the thumb can fit well on distal end 125a. Note that, in this embodiment, the normal direction of flat portion 125 refers to the normal direction of a portion of flat portion 125 excluding the area where distal end 125a and multiple protrusions 126a are formed. The normal direction of the flat surface portion 125 is the radial direction and a direction perpendicular to the arrangement direction of the pair of elastic pieces 140 (for example, the up-and-down direction in FIGS. 8 and 13). As shown in FIG. 8, when the inner shaft 130 is in the second position, the normal direction of an imaginary plane 305 including the opening 2a in the open state is the same as the normal direction of the flat surface portion 125. In FIG. 8, the imaginary plane 305 is shown by a two-dot chain line. In the following description, the radial direction that is the same as the normal direction of the flat portion 125 may be referred to as the first direction (the direction of arrow B shown in Figure 13), and the direction in which the pair of elastic pieces 140 are aligned may be referred to as the second direction (the direction of arrow C shown in Figure 13). However, in the present invention, the arrangement direction (second direction) of the pair of elastic pieces 140 is not limited to the example shown in Fig. 13, and may be any direction that at least intersects with the axial direction. Similarly, in the present invention, the normal direction (first direction) of the planar portion 125 is not limited to the example shown in Fig. 13, and may be any direction that at least intersects with the arrangement direction of the pair of elastic pieces 140.

[0119] In this embodiment, as shown in Figures 18(a) to 18(c), the uneven shape 126 includes a plurality of protrusions 126a formed on the flat portion 125, and one or more (four in this embodiment) ribs 126b formed on at least a portion of the gripping portion 120 other than the flat portion 125 and extending in a direction intersecting the axial direction. With this configuration, the surgeon can, for example, place the thumb along the flat surface portion 125 and place the other fingers along portions of the gripping portion 120 other than the flat surface portion 125, thereby enabling the surgeon to properly grasp the entire gripping portion 120. More specifically, the plurality of protrusions 126a formed on the flat surface portion 125 can prevent the flat surface portion 125 from displacing in the circumferential direction relative to the palm of the surgeon's hand (rotating around the axis). Furthermore, the one or more ribs 126b extending in a direction intersecting the axial direction can prevent the gripping portion 120 from displacing in the axial direction relative to the palm of the surgeon's hand (slipping out of the palm). In the present invention, the uneven shape 126 does not have to include both the plurality of protrusions 126a and one or more ribs 126b, and it is sufficient for the uneven shape 126 to include, for example, at least one of the plurality of protrusions 126a and one or more ribs 126b.

[0120] Each of the plurality of protrusions 126a protrudes from the flat surface 125 (the outer peripheral surface of the gripping portion 120) in one direction in the normal direction of the flat surface 125. Each of the plurality of protrusions 126a is substantially cylindrical. The tip surface of each of the plurality of protrusions 126a (the tip in the protruding direction of the protrusion 126a) is formed flat. The midpoint of each of the ribs 126b (the midpoint in the direction in which the ribs 126b extend) is located 180 degrees away from the flat portion 125 in the radial direction. Each of the ribs 126b extends over an angular range of 180 degrees or more in the circumferential direction. The ribs 126b are arranged at equal intervals from one another in the axial direction. However, the present invention is not limited to this example, and the uneven shape 126 may be either a plurality of protrusions 126a or one or a plurality of ribs 126b. Furthermore, in the present invention, the shape of uneven shape 126 is not limited to this example, and for example, uneven shape 126 may include one or more recesses, or one or more grooves extending in a direction intersecting the axial direction. Furthermore, the number of uneven shapes 126 that grip portion 120 has is not limited to the above example, and for example, uneven shapes other than the plurality of protrusions 126a and the plurality of ribs 126b may be further included. Furthermore, the shape of each of the plurality of protrusions 126a is not limited to this example, and may be, for example, a polygonal column shape, or a cone shape (or polygonal pyramid shape) whose diameter gradually decreases toward the tip side. Furthermore, the number of the plurality of protrusions 126a included in the uneven shape 126 is not limited to the above example, and may be set appropriately. Similarly, the shape of the rib 126b is not limited to this example, and may extend spirally with the central axis being the axis of the gripping portion 120. Furthermore, the number of ribs 126b included in the uneven shape 126 is not limited to the above example, and can be set as appropriate.

[0121] The inner shaft 130 is formed, for example, in a generally rod-like shape that is long in one direction. As shown in Figures 13 and 14, a second gripping portion 150 is provided at the proximal end of the inner shaft 130. The second gripping portion 150 has a diameter larger than the outer diameter of the inner shaft 130. For convenience, the second gripping portion 150 is shown by a two-dot chain line in Figure 13. The inner shaft 130 is made of a resin material such as ABS resin. However, the present invention is not limited to this example, and the inner shaft 130 may be made of a metal material. The second gripping portion 150 is made of a resin material such as polyurethane or polyamide. The outer diameter (maximum diameter) of the inner shaft 130 is not particularly limited, but is preferably 9 mm or more and 13 mm or less. The total length of the inner shaft 130 is not particularly limited, but is preferably 270 mm or more and 470 mm or less.

[0122] As shown in FIG. 8 and other figures, in this embodiment, the normal direction of the surface 152 on the proximal end side of the second gripping portion 150 is the same as the axial direction. With this configuration, the surgeon can smoothly advance the inner shaft 130 relative to the housing tube 110 by pressing the surface 152 on the proximal end side of the second gripping portion 150 with the pads of his fingers or the palm of his hand.

[0123] 14 and other figures, the second gripping portion 150 is formed in a generally disk shape with a diameter larger than the outer diameter (maximum dimension in the radial direction) of the inner shaft 130. The outer diameter of the second gripping portion 150 gradually decreases toward the distal side. Each of a surface 152 on the proximal end side and a surface 154 on the distal end side of the second grip portion 150 is formed flat, and the normal direction thereof is the same as the axial direction. However, in the present invention, the shape of the proximal end surface 152 is not limited to this example, and may be, for example, a concave curve recessed toward the distal side, etc. Furthermore, the proximal end surface 152 may be formed with an uneven shape to prevent slipping, for example.

[0124] As shown in Figures 16(a) and 16(b), the proximal end of the inner shaft 130 is provided with a holding portion 135 that removably holds the loop portion 4a. As shown in FIG. 12 and other figures, when the inner shaft 130 is in the first position, the holding portion 135 is exposed from the housing tube 110.

[0125] With this configuration, the string 4 and therefore the bag body 42 can be detachably connected to the inner shaft 130 via the holding part 135. Furthermore, after the specimen is housed in the bag body 42, the loop part 4a can be removed from the holding part 135 by moving the inner shaft 130 back from the second position to the first position, and the connection between the bag body 42 and the inner shaft 130 can be easily released at the desired timing.

[0126] The holding portion 135 has, for example, a pair of clamping portions 136 arranged opposite each other in the circumferential direction and clamping a portion of the lead-out portion 4b, and a protruding portion 137 arranged proximal to the pair of clamping portions 136 and protruding radially outward. In the opposing direction of the pair of clamping portions 136, the dimension of the protruding portion 137 (W1 shown in FIG. 16(a)) is greater than the separation distance (D1 shown in FIG. 16(a)) between the pair of clamping portions 136. Note that the dimension W1 of the protruding portion 137 here refers to the minimum dimension of the protruding portion 137 in the opposing direction of the pair of clamping portions 136. A part of the lead-out portion 4b passes through the gap between the pair of clamping portions 136 from the distal side to the proximal side, is hooked on the protrusion 137, and then passes through the gap between the pair of clamping portions 136 again from the proximal side to the distal side, forming the loop portion 4a. In the following description, the portion of the lead-out portion 4b on one end side (one end in the extension direction of the lead-out portion 4b) based on the protrusion 137 may be referred to as the first lead-out portion 4ba, and the portion on the other end side (the other end in the extension direction of the lead-out portion 4b) may be referred to as the second lead-out portion 4bb.

[0127] According to this configuration, the first lead-out portion 4ba and the second lead-out portion 4bb can extend in directions gradually separating from each other toward the proximal side between the pair of clamping portions 136 and the protruding portion 137. In other words, the first lead-out portion 4ba and the second lead-out portion 4bb can extend in directions gradually approaching each other toward the distal side between the pair of clamping portions 136 and the protruding portion 137. Furthermore, the lead-out portion 4b is pulled in the axial direction between the pair of clamping portions 136 and the protruding portion 137 and is put into a tensioned state (tension is applied). This makes it possible to prevent the loop portion 4a from unintentionally coming off the holding portion 135. Furthermore, when removing the loop portion 4a from the holding portion 135, the surgeon can easily grasp the lead-out portion 4b. It should be noted that in the present invention, the configuration of the holding portion 135 is not limited to this example, and the holding portion 135 may selectively have, for example, either one of the pair of clamping portions 136 or the protruding portion 137 .

[0128] Furthermore, as shown in Figures 16(a) and 16(b), the holding portion 135 is positioned proximal to the protrusion 137 and has a pressing portion 138 that presses the proximal end 4aa of the loop portion 4a radially inward. This configuration can more reliably prevent the loop portion 4a from unintentionally coming off the holding portion 135. In addition, the lead-out portion 4b can be satisfactorily kept in a tensed state (sufficient tension can be applied) between the pair of clamping portions 136 and the protruding portion 137.

[0129] As shown in Figures 14 and 15, the inner shaft 130 is provided with a retraction restriction portion 139 on the distal side of the holding portion, which restricts the inner shaft 130 from retracting further proximally than the first position. With this configuration, the inner shaft 130 can be prevented from unintentionally falling off from the housing cylinder 110.

[0130] In this embodiment, the state in which the retraction restricting portion 139 abuts against the proximal end portion 121a of the gripping portion 120 (see FIG. 12, etc.) is the first position, which is the initial state of the specimen extraction device 100. When the retraction restricting portion 139 comes into contact with the proximal end portion 121 a of the grip portion 120 , further retraction of the inner shaft 130 relative to the housing tube 110 is restricted. In this embodiment, the state in which the second gripping portion 150 abuts against the proximal end portion 121a of the gripping portion 120 (see FIG. 11, etc.) is the second position. When the distal surface 154 of the second gripping portion 150 abuts against the proximal surface of the gripping portion 120, further advancement of the inner shaft 130 relative to the housing tube 110 is restricted.

[0131] Here, as shown in FIG. 13, the proximal opening 122 of the gripping portion 120 includes a first extension portion 122a extending radially and a second extension portion 122b extending in a direction intersecting the first extension portion 122a. Furthermore, at least the proximal end of the inner shaft 130 includes a first portion 130a extending in the same direction as the extension direction of the first extension portion 122a, and a second portion 130b extending in the same direction as the extension direction of the second extension portion 122b. When the inner shaft 130 slides axially relative to the housing tube 110, a first portion 130a of the inner shaft 130 passes through the first extension portion 122a of the proximal side opening 122, and a second portion 130b of the inner shaft 130 passes through the second extension portion 122b of the proximal side opening 122. More specifically, when the inner shaft 130 slides axially relative to the housing tube 110, the first portion 130a of the inner shaft 130 does not pass through the second extension portion 122b, and the second portion 130b of the inner shaft 130 does not pass through the first extension portion 122a.

[0132] According to this configuration, when the inner shaft 130 slides in the axial direction relative to the accommodating tube 110, it is possible to prevent the inner shaft 130 from rotating about its axis relative to the accommodating tube 110. Therefore, it is possible to satisfactorily maintain the state in which the normal direction of the flat surface portion 125 is the same direction as the direction perpendicular to the arrangement direction of the pair of elastic pieces 140, as described above.

[0133] More specifically, when viewed from the proximal side, the first extension portion 122a and the second extension portion 122b intersect with each other in a generally X-shape. As an example, the first extension portion 122a extends in a first direction, and the second extension portion 122b extends in a second direction. However, the present invention is not limited to this example, and the first extension portion 122a may extend in a direction intersecting the first direction, and the second extension portion 122b may extend in a direction intersecting the second direction.

[0134] As shown in Figures 15, 16(a) and 16(b), the inner shaft 130 has, for example, a main portion 131 formed in the shape of a long plate in the axial direction, a pair of first upright portions 131a standing radially outward from the plate surface on one side of the main portion 131, and a pair of second upright portions 131b standing radially outward from the plate surface on the other side of the main portion 131 in the opposite direction to the first upright portions 131a. In this embodiment, the first upright portion 131a and the second upright portion 131b form a first portion 130a that passes through the first extending portion 122a of the proximal side opening 122. In addition, in the main portion 131, a portion that is radially outward of the first upright portion 131a and the second upright portion 131b forms a second portion 130b that passes through the second extending portion 122b of the proximal side opening 122. In this embodiment, the normal direction of the plate surface of the main portion 131 is the same as the first direction. The rising direction of each of the first rising portion 131a and the second rising portion 131b (extension direction of the first portion 130a) is the same as the first direction. Each of the pair of first standing portions 131a (excluding the formation region of the holding portion 135 (described in detail later)) extends linearly from the distal side to the proximal side on one plate surface of the main portion 131. In the second direction, the pair of first standing portions 131a are spaced apart from each other and face each other. Similarly, each of the pair of second upright portions 131b extends linearly from the distal side to the proximal side on the plate surface on the other side of the main portion 131. In the second direction, the pair of second upright portions 131b are spaced apart from each other and face each other.

[0135] 16(a) and 16(b), the retaining portion 135 is formed, for example, midway through the proximal end portions of the pair of first upright portions 131a on one surface of the main portion 131. More specifically, each of the pair of first upright portions 131a is discontinued in the formation region of the retaining portion 135, and includes a distal portion 131aa and a proximal portion 131ab with respect to the retaining portion 135. In the axial direction, the distal portion 131aa, the retaining portion 135, and the proximal portion 131ab are arranged in this order from the distal side. The lead-out portion 4b is led to the holding portion 135 through the gap between the distal portions 131aa of the pair of first upright portions 131a.

[0136] In this embodiment, one of the pair of clamping portions 136 is formed at the proximal end of the distal portion 131aa of one of the pair of first upright portions 131a, and the other clamping portion 136 is formed at the proximal end of the distal portion 131aa of the other. In this embodiment, the opposing direction of the pair of clamping portions 136 is the second direction. However, the present invention is not limited to this example, and the opposing direction of the pair of clamping portions 136 may be any direction as long as it intersects at least with the axial direction. One clamping portion 136 protrudes, for example, from the inner surface of the corresponding first standing portion 131a toward the other clamping portion 136. One clamping portion 136 is formed in a claw shape that gradually narrows toward the other clamping portion 136. In the case of this embodiment, the separation distance D1 between the pair of clamping portions 136 is the separation distance between the tip surfaces of the pair of clamping portions 136 in the opposing direction (tips in the protruding direction of the clamping portions 136). In this embodiment, the distance D1 between the pair of clamping portions 136 is set to a dimension equal to or slightly smaller than the wire diameter of the cord body 4. The pair of clamping portions 136 clamp the first lead-out portion 4ba and the second lead-out portion 4bb, respectively.

[0137] According to this configuration, both the first lead-out portion 4ba and the second lead-out portion 4bb are pulled in the axial direction between the pair of clamping portions 136 and the protruding portion 137, and are put into a tensed state (tension is applied). 16(a), in a plan view (when viewed in a direction perpendicular to the opposing direction of the pair of clamping portions 136), the first lead-out portion 4ba and the second lead-out portion 4bb intersect with each other in a substantially X-shape. However, the present invention is not limited to this example, and the first lead-out portion 4ba and the second lead-out portion 4bb may extend in parallel with each other.

[0138] The protrusion 137 has a first protrusion 137a that protrudes outward in a first direction from one side surface of the main portion 131, and a second protrusion 137b that protrudes in the same direction as the first protrusion 137a from the tip surface of the first protrusion 137a (the tip in the protruding direction of the first protrusion 137a). The dimension of the first protrusion 137a is larger than the dimension of the second protrusion 137b in the opposing direction of the pair of clamping portions 136. The proximal end of the loop portion 4a of the string 4 is hooked onto the second protrusion 137b.

[0139] 16(b), the loop portion 4a can be made to rise radially outward from one surface of the main portion 131. This allows the surgeon to more easily grasp the loop portion 4a. When viewed in the protruding direction of the protruding portion 137 (see FIG. 16(a)), the first protruding portion 137a has a generally elliptical shape that is elongated in the opposing direction of the pair of clamping portions 136, and the second protruding portion 137b has a generally circular shape. When viewed in the protruding direction of the protruding portion 137, the second protruding portion 137b is disposed in the middle of the second protruding portion 137b in the longitudinal direction.

[0140] The retaining portion 138 protrudes linearly distally, for example, from the distal end of the proximal portion 131ab of the pair of first upright portions 131a. A tip surface 138a of the retaining portion 138 (the tip in the protruding direction of the retaining portion 138) is formed flat, and its normal direction is the same as the axial direction. An inner surface 138b of the retaining portion 138 is also formed flat, and its normal direction is the same as the protruding direction of the protruding portion 137. In this embodiment, the axial distance between the proximal end of the protruding portion 137 and the tip surface 138a of the pressing portion 138 is slightly smaller than the wire diameter of the cord 4. This allows the proximal end 4aa of the loop portion 4a to be clamped between the protruding portion 137 and the tip surface 138a of the pressing portion 138. Furthermore, the tip surface 137aa of the first protruding portion 137a and the inner surface 138b of the pressing portion 138 are disposed at the same position in the protruding direction of the protruding portion 137. This allows the inner surface 138b of the pressing portion 138 to press a portion of the proximal end 4aa of the loop portion 4a radially inward from the tip surface 137aa of the first protruding portion 137a.

[0141] With this configuration, it is possible to prevent the loop portion 4a from coming off the protruding portion 137 at an unintended timing. In the protruding direction of the protruding portion 137, the inner surface 138b of the pressing portion 138 may be located inward (closer to the central axis of the inner shaft 130) than the tip surface 137aa of the first protruding portion 137a. This allows a portion of the proximal end 4aa of the loop portion 4a to be pressed further inward in the radial direction by the inner surface 138b of the pressing portion 138.

[0142] 14 and 15, in this embodiment, the retraction restricting portions 139 are arranged at a plurality of locations in the circumferential direction. More specifically, the retraction restricting portions 139 are formed intermittently in the circumferential direction at a portion between one first standing portion 131a and the main portion 131, a portion between the other first standing portion 131a and the main portion 131, a portion between one second standing portion 131b and the main portion 131, and a portion between the other second standing portion 131b and the main portion 131.

[0143] As shown in FIG. 15, when viewed in the axial direction, each of the plurality of retraction restricting portions 139 is formed in a substantially fan shape. The plate surfaces of the plurality of retraction restricting portions 139 are arranged to face the axial direction. 13, when viewed from the proximal side, each of the multiple retraction restricting portions 139 overlaps with a non-forming region of the proximal opening 122 at the proximal end portion 121a of the grip portion 120. According to this configuration, each of the multiple retraction restricting portions 139 abuts against a non-forming region of the proximal opening 122 at the proximal end portion 121a, thereby restricting further retraction of the inner shaft 130. However, in the present invention, the shape of the retraction restricting portion 139 is not limited to this example, and may extend 360 degrees in the circumferential direction, for example.

[0144] In addition, an opening 138c is formed in the main portion 131 between the protruding portion 137 and the proximal portion 131ab, penetrating the main portion 131 in the thickness direction. This allows the string 4 to be handled from both sides in the radial direction when removing the loop portion 4a from the second protrusion 137b or when hooking the loop portion 4a onto the second protrusion 137b. The opening 138c extends linearly from the proximal end of the protruding portion 137 to the distal end of the proximal portion 131ab. In a plan view (when viewed in the thickness direction of the main portion 131), the pressing portion 138 and the formation area of ​​the opening 138c overlap each other.

[0145] Furthermore, as shown in Figures 16(a) and 16(b), the area of ​​the main portion 131 where the holding portion 135 is formed is a narrowed portion 131c that is narrower towards the central axis (the central axis of the inner shaft 130) than the other parts. With this configuration, the surgeon can easily remove the loop portion 4a from the holder 135 by, for example, pinching the loop portion 4a with one hand and holding the constricted portion 131c with the other hand.

[0146] Here, when the inner shaft 130 is in the first position (i.e., when the bag body 42 is housed in the accommodating tube 110), as shown in FIG. 19(a), the bag body 42 is folded inside the accommodating tube 110 around a virtual line different from the line 302 passing through the midpoint between the pair of elastic pieces 140 as a central axis. Note that FIG. 19(b) illustrates, as a comparative example, a state in which the bag body 42 is folded around the line 302 passing through the midpoint between the pair of elastic pieces 140 as a central axis. Also, FIGS. 19(a) and 19(b) selectively illustrate the folded portion of the bag body 42 (the housing section 42b in this embodiment). Also, FIGS. 19(a) and 19(b) schematically illustrate the accommodating tube 110, the pair of elastic pieces 140, and the housing section 42b in a cross section taken along a direction intersecting the axial direction. Furthermore, in the example shown in Figure 19(a), the midpoint between the pair of elastic pieces 140 is located at the center of the storage tube 110, but the present invention is not limited to this example, and the midpoint between the pair of elastic pieces 140 may be located at a position offset from the center of the storage tube 110 in the radial direction. The central axis 301 here means the axis of the winding if the bag body 42 is wound multiple times, and means the width center of the folded overlapping part, not the fold, if the bag body 42 is folded once or multiple times.

[0147] With this configuration, bag body 42 can be folded more compactly than when bag body 42 is folded around a central axis that is a straight line 302 passing through the midpoint between the pair of elastic pieces 140 (see FIG. 19(b)). Furthermore, since bag body 42 is folded around a central axis 301 that is an imaginary straight line different from the line passing through the midpoint between the pair of elastic pieces 140, when the pair of elastic pieces 140 are exposed from the housing tube 110, bag body 42 can quickly switch from the folded state to the unfolded state (see FIG. 8). 19(a), in this embodiment, the central axis 301 is disposed in a position in the radial direction different from a line 302 that passes through the midpoint between the pair of elastic pieces 140. In the example shown in FIG. 19(a), the central axis 301 is disposed parallel to the line 302 in the radial direction, but the present invention is not limited to this example, and the central axis 301 may intersect with the line 302.

[0148] More specifically, when the inner shaft 130 is in the first position, the bag body 42 is folded inside the accommodating tube 110 in a wound state around the central axis 301 as the winding axis. With this configuration, the bag body 42 can be folded even more compactly compared to when the bag body 42 is folded around the central axis of the straight line 302 that passes through the midpoint between the pair of elastic pieces 140. Furthermore, when the pair of elastic pieces 140 are exposed from the housing tube 110, the bag body 42 can quickly switch from the rolled state to the unrolled state.

[0149] As shown in FIG. 19(a), the central axis 301 is disposed radially outward in the direction in which the pair of elastic pieces 140 are aligned. With this configuration, compared to when the bag body 42 is folded around a central axis that is a straight line 302 passing through the midpoint between the pair of elastic pieces 140 (see FIG. 19(b)), the outer diameter of the wound bag body 42 can be made smaller by the width and thickness dimensions of the pair of elastic pieces 140. Furthermore, since there is no need to wind the bag body 42 against the elastic restoring force of the pair of elastic pieces 140, the bag body 42 can be wound more tightly. Therefore, the wound thickness of the bag body 42 can be made smaller.

[0150] It should be noted that the "outer winding diameter and thickness of the bag body 42" referred to here refers to the outer winding diameter (maximum outer diameter) R4, R5 and the thickness T1, T2 (see Figures 19(a) and 19(b)) of the part of the bag body 42 excluding the pair of string-passing portions 2ra (storage portion 42b). As shown in FIG. 19( a ), in this embodiment, the central axis 301 is disposed radially outward of a straight line 302 passing through the midpoint between the pair of elastic pieces 140 . 19(b), when the bag body 42 is folded around a central axis that is a straight line 302 passing through the midpoint between the pair of elastic pieces 140, the outer wound diameter R5 of the storage portion 42b is greater than the width dimension of the elastic pieces 140. On the other hand, as shown in FIG. 19(a), in this embodiment, the central axis 301 is disposed radially outward in the arrangement direction of the pair of elastic pieces 140, so the outer wound diameter R4 of the storage portion 42b can be, for example, equal to or smaller than the width dimension of the elastic pieces 140. However, the outer wound diameter R4 of the storage portion 42b may be, for example, greater than the width dimension of the elastic pieces 140. Furthermore, when the bag body 42 is folded around the central axis of a straight line 302 passing through the midpoint between the pair of elastic pieces 140, the bag body 42 needs to be wound against the elastic restoring force of the pair of elastic pieces 140, and therefore, as shown in Figures 19(a) and 19(b), the winding thickness T2 of the storage section 42b in the comparative example is greater than the winding thickness T1 of the storage section 42b in this embodiment. The winding thickness T1 of the accommodating portion 42b is, for example, preferably ⅔ or less of the width dimension of the elastic piece 140, and more preferably ½ or less. Furthermore, compared to when the bag body 42 is folded around a central axis that is a straight line 302 passing through the midpoint between a pair of elastic pieces 140, in this embodiment, the outer winding diameter R4 and winding thickness T1 of the storage section 42b can be made smaller, and therefore the circumferential length of the storage section 42b (the circumferential length in a cross section perpendicular to the central axis 301) can also be made smaller (for example, to less than half the circumferential length of the storage section 42b in the comparative example).

[0151] According to this configuration, for example, inside the housing tube 110, it is possible to prevent the housing portion 42b and the inner circumferential surface of the housing tube 110 from interfering with each other.

[0152] An example of the folded state of the bag body 42 in this embodiment will be described below. 19(a), the storage section 42b of the bag body 42 is wound around a central axis 301 that is an imaginary line extending parallel to the edge of the opening 2a. Specifically, the storage section 42b may be folded multiple times along a folding line (not shown) that intersects with the center line C of the storage section 42b. In addition, in a folded state, the entire storage section 42b may fit inside the width direction of the opening 2a in a plan view (when viewed in the normal direction to the front or back surface of the bag body 42). In this way, the storage portion 42b may be folded along a plurality of folding lines that intersect with the center line C of the storage portion 42b, and the folded storage portion 42b may be wound around the central axis 301. In this configuration, the central axis 301 is the winding axis of the storage portion 42b and also forms the width center of the folded overlapping portion of the storage portion 42b.

[0153] With this configuration, even if the bag body 42 is inclined obliquely downward from the opening 2a to the tip end (rear end 2c) on the opposite side of the opening 2a, it can be folded compactly. However, in the present invention, the number of times the bag body is folded (the number of folding lines) is not particularly limited, and can be set appropriately depending on the shape and dimensions of the bag body . Furthermore, in the present invention, bag body 42 may be simply folded along the folding lines, and may not be wound around central axis 301. Similarly, in the present invention, bag body 42 may be simply wound around central axis 301, and may not be folded along the folding lines. Furthermore, in the present invention, the folded state of the bag body 42 is not limited to this example.

[0154] In this embodiment, an anti-blocking agent is applied to at least a portion of the surface of the bag body 42. This configuration prevents the surfaces of the folded bag body 42 from sticking together, and when pushed out of the storage tube 110, the bag body 42 can quickly change from the folded state to the unfolded state (see Figure 8, etc.). The anti-blocking agent may be applied to the entire surface of the bag body 42, or may be applied locally to a portion of the surface.

[0155] The inner circumferential surface of the housing cylinder 110 may also be coated with an anti-blocking agent. With this configuration, the bag body 42 can slide smoothly within the housing tube 110 together with the pair of elastic pieces 140 .

[0156] Blocking refers to a phenomenon in which rubber or resin film or sheet materials adhere to each other and become difficult to separate when they are superimposed and kept in contact for a long period of time. The anti-blocking agent is not particularly limited as long as it has the effect of preventing blocking, and one example is silicone oil. The viscosity of the silicone oil is, for example, preferably 20.0 cP (centipoise) or more and 150 cP or less, and more preferably 60.0 cP or more and 110 cP or less.

[0157] An example of a method of using the specimen retrieval device 100 of this embodiment will be described below. In a procedure (e.g., thoracoscopic surgery) using the specimen retrieval device 100, the specimen retrieval device 100 is inserted into a body cavity through an incision 30a formed in the body cavity, and a specimen (resection piece 10) is stored in the storage portion 42b and removed from the body.

[0158] First, as shown in FIG. 20, the distal end of the specimen extraction device 100 in its initial state (the distal end of the housing tube 110) is inserted into the body cavity (thoracic cavity) through the incision 30a.

[0159] Next, as shown in Figure 21, the inner shaft 130 is advanced from the first position to the second position. More specifically, first, while holding the gripping portion 120 with one hand, the second gripping portion 150 is advanced with the other hand toward the casing tube 110 together with the inner shaft 130, thereby exposing the distal end of the inner shaft 130 and the pair of elastic pieces 140 from the casing tube 110. Next, when the inner shaft 130 is advanced to the second position, the pair of elastic pieces 140 are released from the constraint of the casing tube 110 and elastically restore from the closed state to their natural state. This allows the opening 2a to be elastically opened in the body cavity.

[0160] Next, once the resection piece 10 is accommodated in the accommodation portion 42b, the connection between the bag body 42 and the specimen retrieval device 100 is released. More specifically, as shown in FIG. 22 , the inner shaft 130 is retracted from the second position to the first position again. This causes the holding portion 135 and the loop portion 4a to be exposed from the accommodation tube 110. Furthermore, the pair of elastic pieces 140 are pulled proximally from the corresponding string-passing portions 2ra and are accommodated again within the accommodation tube 110. In this state, the loop portion 4a can be removed from the protrusion 137 to release the connection between the bag body 42 and the inner shaft 130.

[0161] As shown in FIG. 23, once the connection between the bag body 42 and the inner shaft 130 has been released, the housing tube 110 and the inner shaft 130 are removed from the body cavity, leaving the bag body 42 and the string body 4 in the body cavity.

[0162] 24, the fastener 50 is slid relative to the string 4 in a direction approaching the opening 2a, thereby closing the opening 2a. The fastener 50 may be operated by the surgeon's hand outside the body cavity, or may be operated inside the body cavity using forceps or the like. Next, the resection piece 10 together with the bag body 42 is removed from the body through the incision 30a. In this way, the specimen removal device 100 can be used to store the specimen (excision piece 10) in the storage section 42b and then remove it from the body.

[0163] The various components of the specimen extraction bag (1, 1A, 1B, 1C) of the present invention do not need to be independent entities, and it is acceptable for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, or for part of one component to overlap part of another component, etc. Similarly, the various components of the specimen removal device 100 of the present invention do not necessarily have to be independent entities, and it is acceptable for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be a part of another component, or for part of one component to overlap with part of another component, etc.

[0164] Although the embodiments and modifications have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

[0165] The present embodiment encompasses the following technical ideas. (1) a bag body having a storage portion for storing a specimen through an opening; The sample extraction bag is characterized in that the bag body is inclined obliquely downward from the opening to the tip portion on the opposite side of the opening. (2) The specimen extraction bag according to (1), wherein the storage section has a smoothly curved portion formed between the tip and the opening. (3) A sample extraction bag as described in (1) or (2), wherein the storage section has a continuous downward slope up to the tip, and no portion parallel to the opening is formed. (4) A specimen extraction bag described in any one of (1) to (3), wherein the length of the bag body in a direction parallel to one direction on an imaginary plane including the opening is longer than the length in a direction perpendicular to the opening. (5) A sample extraction bag according to any one of (1) to (4), wherein the sample is an intrathoracic organ, and the bag body is for containing the intrathoracic organ. (6) The specimen extraction bag according to (5), wherein the intrathoracic organ is a lung, and the bag body is for containing the lung. (7) A sample extraction bag according to any one of (1) to (6), wherein the volume of the storage section is 500 mL or more and 1000 mL or less. (8) The specimen extraction bag according to any one of (1) to (7), wherein the tip of the bag body is formed in a partially spherical shape with a diameter of 50 mm or more and 100 mm or less. (9) The opening area of ​​the opening is 60 cm 2 Over 120cm 2 A specimen collection bag according to any one of (1) to (8) below. (10) The bag body has an inner edge close to a bending center side on an inner surface of the bag body and an outer edge away from the bending center side, The inner edge has at least one discontinuity point where the curvature is discontinuous, The area of ​​a cross section of the container parallel to the opening, including the point of discontinuity closest to the opening, is 40 cm 2 More than 80cm 2 A specimen collection bag according to any one of (1) to (9) below. (11) A specimen removal bag as described in (10), wherein the area of ​​the cross section parallel to the opening is 1.3 times or more and 4 times or less the area of ​​the cross section perpendicular to the center line of the storage section including the point of the discontinuity in the storage section that is closest to the opening. (12) The bag body has an inner edge close to a bending center side on an inner surface of the bag body and an outer edge away from the bending center side, A sample extraction bag described in any one of (1) to (7), wherein the circumference of the inner surface of the bag body intersecting with a cross section perpendicular to the center line of the storage section decreases from the opening to the tip portion on the opposite side of the opening. (13) The sample extraction bag according to (12), wherein the perimeter of the opening is 160 mm or more and 400 mm or less. (14) A specimen extraction bag as described in (13), wherein the circumference of the inner surface of the bag body intersects with the cross section perpendicular to the center line at a position between 20% and 40% from the opening relative to the length from the opening to the tip of the center line, and is 60% to 80% of the circumference of the opening. (15) A specimen extraction bag according to any one of (1) to (14), wherein the inner surface of the bag body is coated with a water-repellent coating. (16) Further provided with a handle to be held by a user, The handle is pulled out to one side relative to the bag body, The sample extraction bag according to any one of (1) to (15), wherein the tip provided on the bag body is positioned on the one side of the opening. (17) A sample removal bag as described in any one of (1) to (16), wherein the bag body has a lumen extending from the rear end of the storage section to the base end on the opening side, and allowing gas in the storage section to pass through the opening. (18) The sample extraction bag according to (17), wherein the lumens are provided in a plurality of opposed positions across the center of the storage section. (19) The specimen extraction bag according to (18), which cites (2), wherein the bent portion is bent in a plane connecting the two lumens that face each other across the center of the storage portion. (20) The bag body has a flared portion in the vicinity of the opening that becomes wider from the back side of the storage portion toward the opening, A specimen removal bag according to any one of (17) to (19), wherein the proximal end of the lumen extends along the flared portion. (twenty one) The bag body is made of a resin film, The sample extraction bag according to any one of (17) to (20), wherein the lumen is formed by heat-sealing the bag body in a line. (twenty two) The bag further includes a string provided at the edge of the opening, A specimen extraction bag according to any one of (1) to (21), wherein the string has a shape memorized so that the opening is in an open state. (twenty three) The bag body has a discharge opening at a rear end opposite to the opening, the discharge opening communicating the storage section with the outside, A specimen removal bag as described in any one of (1) to (16), wherein the discharge opening is blocked with a filter that allows gas to pass through but not liquid. (twenty four) A specimen removal device comprising the specimen removal bag according to any one of (1) to (23), The sample extraction device is configured so that the opening of the bag body can be opened, and the opening in the open state can be closed. (twenty five) an extrusion operation unit including a housing tube, a gripping portion fixed to a proximal end of the housing tube, and an inner shaft inserted axially slidably into the housing tube; The specimen extraction device described in (24) is capable of advancing in the axial direction from a first position in which the bag body is contained within the storage tube to a second position in which the bag body is pushed out of the storage tube. (26) an opening operation unit having a housing tube, a gripping portion fixed to a proximal end of the housing tube, an inner shaft inserted through the housing tube so as to be slidable in the axial direction, and a pair of elastic pieces whose distal end sides are open in a natural state; The pair of elastic pieces are fixed to the distal end of the inner shaft and hold the vicinity of the opening, the inner shaft is capable of advancing in the axial direction from a first position where the pair of elastic pieces are housed in the housing cylinder to a second position where the pair of elastic pieces are exposed from the housing cylinder and are in the natural state, The specimen extraction device according to (24) or (25), wherein the opening can be elastically opened to the open state by advancing the inner shaft to the second position. (27) the specimen removal bag includes a string attached to the edge of the opening; The bag body has a pair of string-insertion portions formed on one side and the other side of the edge of the opening, and through which the string is inserted, The string is configured to be able to put the opening in the closed state, One of the pair of elastic pieces is inserted into one of the pair of string-passing portions, The specimen extraction device according to (26), wherein the other of the pair of elastic pieces is inserted into the other of the pair of string-passing portions. (28) The elastic piece is formed in a plate shape, The elastic piece has an arcuate curved portion that is curved in an arc shape toward the distal end side and approaches the other elastic piece, a distal side portion that is connected to the distal end side of the arcuate curved portion, and a distal-most end portion that is connected to the distal side of the distal side portion, A specimen extraction device as described in (27), wherein in the natural state, the distal end of the elastic piece extends in a direction away from the distal end of the other elastic piece toward the distal end and in a direction intersecting the axial direction. (29) a second gripping portion having a diameter larger than an outer diameter of the inner shaft is provided at a proximal end of the inner shaft; The specimen extraction device according to any one of (26) to (28), wherein the normal direction of the surface on the proximal end side of the second gripping portion is the same as the axial direction. (30) A portion of the string body serves as a lead-out portion that is led out from the pair of string-threading portions, a portion of the outlet portion is introduced into the housing cylinder and forms a loop portion; a retaining portion provided at a proximal end of the inner shaft for removably retaining the loop portion; The specimen extraction device according to (27) or (28), wherein the holding portion is exposed from the housing tube when the inner shaft is in the first position. (31) The holding portion is a pair of clamping portions that are arranged opposite to each other in the circumferential direction and clamp a portion of the lead-out portion, and a protruding portion that is arranged proximal to the pair of clamping portions and protrudes radially outward, a width dimension of the protruding portion in a direction in which the pair of clamping portions face each other is greater than a distance between the pair of clamping portions; A specimen extraction device as described in (30), wherein a portion of the lead-out portion passes through the gap between the pair of clamping portions from the distal side to the proximal side, is hooked onto the protrusion, and then passes through the gap between the pair of clamping portions again from the proximal side to the distal side to form the loop portion. (31-1) A specimen extraction device as described in (31), wherein the holding portion is positioned proximal to the protrusion and has a pressing portion that presses the proximal end of the loop portion radially inward. (31-2) The specimen extraction device according to (31-1), wherein the axial distance between the protruding portion and the distal end face of the pressing portion is smaller than the wire diameter of the string. (31-3) the protruding portion has a first protruding portion and a second protruding portion protruding from a tip end surface of the first protruding portion in the same direction as the first protruding portion, In a direction in which the pair of clamping portions face each other, a dimension of the first protrusion is larger than a dimension of the second protrusion, The specimen extraction device according to (31), wherein the loop portion of the string is hooked onto the second protrusion. (32) When the inner shaft is in the first position, A specimen extraction device described in any one of (26) to (31), wherein the bag body is folded inside the storage tube with a virtual straight line different from the line passing through the midpoint between the pair of elastic pieces as the central axis. (33) When the inner shaft is in the first position, The specimen extraction device according to (32), wherein the bag body is folded in a wound state around the central axis inside the storage tube. (34) The specimen extraction device according to (32) or (33), wherein the central axis is disposed radially outward in the direction in which the pair of elastic pieces are arranged. (35) The specimen removal bag further comprises a fastener formed in a cylindrical shape; A specimen extraction device as described in (28), wherein one end of the string leading out from one of the string-passing portions to the inner shaft side, and the other end of the string leading out from the other string-passing portion to the inner shaft side, are each slidably inserted into the fastener. (36) A specimen extraction device as described in (30) or (31), wherein the inner shaft has a retraction restriction portion distal to the holding portion that restricts the inner shaft from retracting further proximally than the first position.

[0166] In the fifth embodiment, the specimen retrieval device is provided with a specimen retrieval bag. However, the present invention is not limited to this example, and the specimen retrieval device may be provided with or without a specimen retrieval bag. That is, this embodiment is as follows: <1> It also encompasses the technical ideas of <1> An opening operation part used to elastically open the opening of the sample removal bag according to any one of (1) to (23), A container tube; a grip portion fixed to a proximal end of the housing barrel; an inner shaft that is slidably inserted in the axial direction into the housing cylinder; a pair of elastic pieces whose distal ends are open in a natural state; The pair of elastic pieces are fixed to the distal end of the inner shaft and hold the vicinity of the opening, the inner shaft is capable of advancing in the axial direction from a first position where the pair of elastic pieces are housed in the housing cylinder to a second position where the pair of elastic pieces are exposed from the housing cylinder and are in the natural state, An opening operation portion capable of elastically opening the opening by advancing the inner shaft to the second position.

[0167] Furthermore, the first to fifth embodiments described above are as follows: <2> or <3> It also encompasses the technical ideas of <2> <1> A sample extraction bag that is held by the pair of elastic pieces of the opening operation part and stored in the storage tube, The sample removal bag has the bag body folded inside the housing cylinder with a central axis being an imaginary line different from the line passing through the midpoint between the pair of elastic pieces. <3> <1> A sample extraction bag that is held by the pair of elastic pieces of the opening operation part and stored in the storage tube, A specimen collection bag in which an anti-blocking agent is applied to at least a portion of the surface of the bag body. In the above-described first to fifth embodiments, examples have been described in which the bag body of the specimen extraction bag is inclined downward from the opening to the tip. <2> or <3> In the specimen extraction bag described in 1, the bag body may be configured to slope downward obliquely from the opening to the tip. <2> or <3> The bag body of the specimen removal bag described in 1 above may extend linearly in the specimen insertion / removal direction from the opening to the tip, for example.

[0168] This application claims priority based on Japanese Patent Application No. 2024-98054, filed June 18, 2024, the disclosure of which is incorporated herein in its entirety. [Explanation of symbols]

[0169] 1, 1A, 1B, 1C Sample collection bag 2 bags 2a aperture 2b Storage section 2c Back end (tip) 2d proximal end 2F flare section 2g sheet 2h, 2i bent part 2p Inner rim 2pa proximal end 2pb deep end 2q outer edge 2ra Pair of string guides 2raa Opening on one end 3 Pushing mechanism 3a Expansion / contraction part 3b Rubber ball (control unit) 3c tube 3d check valve 4 String (handheld part) 4a Loop section 4aa proximal end 4b Derivation part 4ba 1st derivation part 4bb 2nd derivative 5. Storage tube (handheld part) 10 Excision piece (specimen) 13 Pushing mechanism 13a Expansion / contraction part 14 Filters 15 Discharge opening 16 lumens 16a Proximal end 17 Tow rope 17a Ring 20 Incision guard 24 String (handheld part) 30 body wall 30a incision wound 42 Bag body 42b Storage section 50 Fasteners 100 Specimen removal device 110 Storage tube 120 Gripping part 121a proximal end 122 Proximal opening 122a 1st extension part 122b 2nd extension part 125 Plane section 125a distal end 126 Uneven shape 126a Multiple protrusions 126b Multiple Ribs 130 inner shaft 130a Part 1 130b Part 2 131 Main Section 131a Pair of first uprights 131aa Distal end part 131ab Proximal end part 131b Pair of second uprights 131c Neck 132 Fixing member 134 Insertion part 135 Holding part 136 Pair of clamping parts 137 Protrusion 137a 1st protrusion 137aa Tip surface 137b Second protrusion 138 Presser foot 138a Tip surface 138b Inner surface 138c opening 139 Reverse control section 140 Pair of elastic pieces 142 Arc-shaped curved section 144 Distal portion 146 Distalmost end 150 Second grip part 152 Proximal end surface 154 Distal surface 162 Extrusion operation unit 164 Opening operation part 301 Central axis (imaginary line) 302 A straight line passing through the midpoint between a pair of elastic pieces 305 Virtual Plane A1, A2 cross section C center line LA upper inner border LB Lower inner edge P1 discontinuity

Claims

1. a bag body having a storage portion for storing a specimen through an opening; The sample extraction bag is characterized in that the bag body is inclined obliquely downward from the opening to the tip portion on the opposite side of the opening.

2. 2. The specimen extraction bag according to claim 1, wherein the storage section has a smoothly curved portion formed between the tip and the opening.

3. 3. The sample removal bag according to claim 1, wherein the storage section has a continuous downward slope up to the tip, and no portion parallel to the opening is formed.

4. 4. The specimen extraction bag according to claim 3, wherein the length of the bag body in a direction parallel to one direction on an imaginary plane including the opening is longer than the length in a direction perpendicular to the opening.

5. 5. The specimen extraction bag according to claim 4, wherein the specimen is an intrathoracic organ, and the bag body is for containing the intrathoracic organ.

6. 6. The specimen extraction bag according to claim 5, wherein the intrathoracic organ is a lung, and the bag body is for containing the lung.

7. 7. The sample extraction bag according to claim 6, wherein the volume of the storage section is 500 mL or more and 1000 mL or less.

8. 8. The specimen extraction bag according to claim 7, wherein the tip of the bag body is formed in a partially spherical shape with a diameter of 50 mm or more and 100 mm or less.

9. The opening area of ​​the opening is 60 cm ２ Above, 120cm ２ 9. The specimen removal bag of claim 8, wherein:

10. The bag body has an inner edge close to a bending center side on an inner surface of the bag body and an outer edge away from the bending center side, the inner edge has at least one discontinuity point where the curvature is discontinuous; The area of ​​a cross section of the storage section parallel to the opening including the point of the discontinuity closest to the opening is 40 cm ２ Above, 80cm ２ 10. The specimen removal bag of claim 9, wherein:

11. The specimen removal bag of claim 10, wherein the area of ​​the cross section parallel to the opening is 1.3 times or more and 4 times or less the area of ​​the cross section perpendicular to the center line of the storage section including the point of the discontinuity in the storage section that is closest to the opening.

12. The bag body has an inner edge close to a bending center side on an inner surface of the bag body and an outer edge away from the bending center side, 8. The sample extraction bag according to claim 7, wherein the perimeter of the inner surface of the bag body intersecting a cross section perpendicular to the center line of the storage section decreases from the opening to the tip portion on the opposite side of the opening.

13. 13. The specimen removal bag according to claim 12, wherein the perimeter of the opening is not less than 160 mm and not more than 400 mm.

14. 14. The specimen removal bag of claim 13, wherein the perimeter of the inner surface of the bag body intersects with the cross section perpendicular to the center line at a position 20% to 40% from the opening relative to the length from the opening to the tip of the center line, and the perimeter is 60% to 80% of the perimeter of the opening.

15. 12. The specimen dispensing bag according to claim 11, wherein the inner surface of the bag body is coated with a water-repellent coating.

16. Further provided with a handle to be held by a user, The handle is pulled out to one side relative to the bag body, 16. The specimen extraction bag according to claim 15, wherein the tip provided on the bag body is located on the one side of the opening.

17. 17. The specimen removal bag according to claim 16, wherein the bag body is provided with a lumen extending from the inner end of the storage section to the base end on the opening side, for allowing gas within the storage section to pass through the opening.

18. 18. The specimen extraction bag according to claim 17, wherein a plurality of the lumens are provided facing each other across the center of the storage section.

19. 19. The specimen removal bag according to claim 18, which relies on claim 2, wherein the bent portion is bent in a plane connecting two of the lumens that face each other across the center of the storage portion.

20. The bag body has a flared portion in the vicinity of the opening that becomes wider from the back side of the storage portion toward the opening, 20. The specimen retrieval bag of claim 19, wherein the proximal end of the lumen extends along the flared portion.

21. The bag body is made of a resin film, 21. The specimen extraction bag according to claim 20, wherein the lumen is formed by heat-sealing the bag body in a line.

22. The bag further includes a string provided at the edge of the opening, 22. The specimen removal bag of claim 21, wherein the string has a shape memory that keeps the opening in an open position.

23. The bag body has a discharge opening at a rear end opposite to the opening, the discharge opening communicating the storage section with the outside, 17. The specimen removal bag of claim 16, wherein the discharge opening is blocked with a filter that allows gas to pass through but not liquids.

24. A specimen removal device comprising the specimen removal bag of claim 1 or 2, The sample extraction device is configured so that the opening of the bag body can be opened, and the opening in the open state can be closed.

25. an extrusion operation unit including a housing tube, a gripping portion fixed to a proximal end of the housing tube, and an inner shaft inserted axially slidably into the housing tube; 25. The specimen extraction device of claim 24, wherein the inner shaft is advanceable in the axial direction from a first position in which the bag body is contained within the storage tube to a second position in which the bag body is pushed out of the storage tube.

26. an opening operation unit having a housing tube, a gripping portion fixed to a proximal end of the housing tube, an inner shaft inserted through the housing tube so as to be slidable in the axial direction, and a pair of elastic pieces whose distal end sides are open in a natural state; The pair of elastic pieces are fixed to the distal end of the inner shaft and hold the vicinity of the opening, the inner shaft is capable of advancing in the axial direction from a first position where the pair of elastic pieces are housed in the housing cylinder to a second position where the pair of elastic pieces are exposed from the housing cylinder and are in the natural state, 25. The specimen retrieval device of claim 24, wherein the opening is resiliently openable to the open condition by advancing the inner shaft to the second position.

27. the specimen removal bag includes a string attached to the edge of the opening; The bag body has a pair of string-insertion portions formed on one side and the other side of the edge of the opening, and through which the string is inserted, The string is configured to be able to put the opening in the closed state, One of the pair of elastic pieces is inserted into one of the pair of string-passing portions, 27. The specimen extraction device according to claim 26, wherein the other of the pair of elastic pieces is inserted into the other of the pair of string passages.

28. The elastic piece is formed in a plate shape, The elastic piece has an arcuate curved portion that is curved in an arc shape toward the distal end side and approaches the other elastic piece, a distal side portion that is connected to the distal end side of the arcuate curved portion, and a distal-most end portion that is connected to the distal side of the distal side portion, 28. The specimen extraction device of claim 27, wherein in the natural state, the distal end of the elastic piece extends in a direction away from the distal end of the other elastic piece toward the distal end and in a direction intersecting the axial direction.

29. a second gripping portion formed to have a diameter larger than an outer diameter of the inner shaft is provided at a proximal end of the inner shaft; 27. The specimen extraction device according to claim 26, wherein the normal direction of the surface on the proximal end side of the second gripping portion is the same as the axial direction.

30. A portion of the string body serves as a lead-out portion that is led out from the pair of string-threading portions, a portion of the outlet portion is introduced into the housing cylinder and forms a loop portion; a retaining portion provided at a proximal end of the inner shaft for removably retaining the loop portion; 28. The specimen extraction device of claim 27, wherein the holding portion is exposed from the housing barrel when the inner shaft is in the first position.

31. The holding portion is a pair of clamping portions that are arranged opposite to each other in the circumferential direction and clamp a portion of the lead-out portion, and a protruding portion that is arranged proximal to the pair of clamping portions and protrudes radially outward, a width dimension of the protruding portion in a direction in which the pair of clamping portions face each other is greater than a distance between the pair of clamping portions; A specimen extraction device as described in claim 30, wherein a portion of the lead-out portion passes through the gap between the pair of clamping portions from the distal side to the proximal side, is hooked on the protrusion, and then passes through the gap between the pair of clamping portions again from the proximal side to the distal side to form the loop portion.

32. When the inner shaft is in the first position, 27. The specimen extraction device according to claim 26, wherein the bag body is folded inside the housing cylinder around a central axis that is an imaginary line different from the line passing through the midpoint between the pair of elastic pieces.

33. When the inner shaft is in the first position, 33. The specimen extraction device according to claim 32, wherein the bag body is folded in a wound state around the central axis inside the housing cylinder.

34. 33. The specimen extraction device according to claim 32, wherein the central axis is disposed radially outward in the direction in which the pair of elastic pieces are aligned.

35. The specimen removal bag further comprises a fastener formed in a cylindrical shape; A specimen extraction device as described in claim 28, wherein one end of the string leading out from one of the string guide portions toward the inner shaft and the other end of the string leading out from the other string guide portion toward the inner shaft are each slidably inserted into the fastener.

36. The specimen extraction device according to claim 30, wherein the inner shaft is provided with a retraction restriction portion distal to the holding portion that restricts the inner shaft from retracting further proximally than the first position.

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