Specimen retrieval bag and specimen retrieval device

Abstract

Provided are a specimen retrieval bag and a specimen retrieval device that easily retrieves a removed specimen out of a body in a state where the removed specimen is stored. Provided is a bag body 2 including a storage portion 2b that stores a specimen (excision piece) via an opening 2a. The bag body 2 is obliquely inclined downward from the opening 2a to a tip portion (back end portion 2c) on a side opposite to the opening 2a. That is, the bag body 2 achieves the above-described object by a specimen retrieval bag 1 extending with a component in a direction intersecting with a central axis of the opening 2a and a component in a direction away from the opening 2a when viewed in an extending direction of the central axis.

Description

SPECIMEN RETRIEVAL BAG AND SPECIMEN RETRIEVAL DEVICE

[0001] The present invention relates to a specimen retrieval bag and a specimen retrieval device.

[0002] In a thoracoscopic surgery, various devices are used when a portion of an organ such as a lung in which a lesion site such as a tumor occurs is excised, and a specimen of the excised organ or the like is retrieved out of a body from an incision wound (surgical treatment hole) formed between a rib bone and a rib bone (in an intercostal space). For example, Patent Document 1 discloses a specimen retrieval bag (referred to as an organ removal bag in Patent Document 1) that is used for the thoracoscopic surgery and that can store and remove the specimen of the excised organ or the like. In order to smoothly guide the specimen to a small-diameter storage portion, a passage portion leading to the small-diameter storage portion in this specimen retrieval bag is formed to be curved without being bent in a direction intersecting with a direction in which the specimen enters and exits. In order to prevent the specimen or the like stored in the storage portion from leaking out or from scattering to the outside of the bag, the storage portion of the specimen retrieval bag is formed at an angle of 90 degrees or larger with respect to the direction in which the specimen enters and exits through an opening.

[0003] JP-A-2004-65743

[0004] Since the incision wound formed in the thoracoscopic surgery is provided in the intercostal space, a size of a hole is limited. In addition, since a space inside a thoracic cavity is narrow, it is difficult to carry out work for retrieving the specimen. As described above, the storage portion of the specimen retrieval bag disclosed in Patent Document 1 is formed at the angle of 90 degrees or larger with respect to the direction in which the specimen enters and exits through the opening. Therefore, in a state where the removed specimen is stored, the storage portion inevitably protrudes. Consequently, an operator has a difficulty in retrieving the specimen retrieval bag out of a body from the incision wound formed on a body wall.

[0005] The present invention is made in view of the above-described problems, and provides a specimen retrieval bag that easily retrieves a removed specimen out of a body in a state where the removed specimen is stored, and a specimen retrieval device.

[0006] According to the present invention, there is provided a specimen retrieval bag including a bag body including a storage portion for storing a specimen through an opening. The bag body is obliquely inclined downward from the opening to a tip portion located on a side opposite to the opening.

[0007] In addition, according to the present invention, there is provided a specimen retrieval device. The specimen retrieval device includes the specimen retrieval bag. The specimen retrieval device is configured to place the opening of the bag body in an open state and to place the opening which is in the open state into a closed state.

[0008] According to a specimen retrieval bag and a specimen retrieval device in the present invention, a removed specimen is easily retrieved out of a body in a state where the removed specimen is stored.

[0009] Fig. 1 is a schematic front view showing a specimen retrieval bag according to a first embodiment.Fig. 2 is a view showing a storage portion of a bag body forming a specimen retrieval bag according to a modification example, and is a view for describing the storage portion in a state where the bag body is contracted and planarly formed.Fig. 3 is a schematic front view showing a specimen retrieval bag according to a second embodiment.Fig. 4 is a schematic view showing a state where a specimen is stored in the specimen retrieval bag.Fig. 5 is a schematic view showing a state where a specimen is pushed toward an opening by expanding an expansion / contraction portion.Fig. 6 is a schematic front view showing a specimen retrieval bag according to a third embodiment.Fig. 7 is a schematic front view showing a specimen retrieval bag according to a fourth embodiment.Fig. 8 is a longitudinal sectional view showing a specimen retrieval device according to a fifth embodiment, and shows a state where an inner shaft is located at a second position.Fig. 9 is a perspective view showing the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft is located at the second position.Fig. 10 is a perspective view showing the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft is located at a first position.Fig. 11 is a plan view showing the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft is located at the second position.Fig. 12 is a plan view showing the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft is located at the first position.Fig. 13 is a view showing the specimen retrieval device according to the fifth embodiment, and shows a state when viewed from a proximal side.Fig. 14 is a plan view showing the inner shaft according to the fifth embodiment.Fig. 15 is a cross-sectional view taken along line B-B shown in Fig. 14.Figs. 16(a) and 16(b) are views showing a holding portion and a peripheral structure thereof in the fifth embodiment, in which Fig. 16(a) is a plan view and Fig. 16(b) is a side view.Figs. 17(a) and 17(b) are views showing a pair of elastic pieces and a peripheral structure thereof in the fifth embodiment, in which Fig. 17(a) is a plan view and Fig. 17(b) is a side view.Figs. 18(a), 18(b), and 18(c) are views showing a grip portion in the fifth embodiment, in which Fig. 18(a) is a side view, Fig. 18(b) is a plan view, and Fig. 18(c) is a back view.Fig. 19(a) shows a schematic cross section showing a state where the bag body is wound in the fifth embodiment, and Fig. 19(b) shows a schematic cross section showing a state where the bag body is wound in a comparative example.Fig. 20 is a view for describing an example of a method of using the specimen retrieval device according to the fifth embodiment, and shows a state where a distal end portion of a storage tube is inserted into a body cavity.Fig. 21 is a view for describing an example of a method of using the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft moves forward from the first position to the second position.Fig. 22 is a view for describing an example of a method of using the specimen retrieval device according to the fifth embodiment, and shows a state where the inner shaft moves rearward to the first position from the state shown in Fig. 21.Fig. 23 is a view for describing an example of a method of using the specimen retrieval device according to the fifth embodiment, and shows a state where the storage tube and the inner shaft are retrieved from the body cavity from the state shown in Fig. 22.Fig. 24 is a view for describing an example of a method of using the specimen retrieval device according to the fifth embodiment, and shows a state where the opening is closed from the state shown in Fig. 23.

[0010] Hereinafter, a specimen retrieval bag according to embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples for facilitating understanding of the present invention, and the present invention is not limited thereto. That is, a shape, a dimension, a disposition, and the like of members described below can be changed and improved without departing from the concept of the present invention, and as a matter of course, the present invention includes equivalents thereof.

[0011] The drawings used in the present embodiment show examples of a configuration and a shape of the specimen retrieval bag of the present invention and a disposition of each member forming the specimen retrieval bag, and do not limit the present invention. In addition, the drawings do not necessarily accurately represent a dimensional ratio such as a length, a width, and a height of the specimen retrieval bag. Similarly, the drawings used in the present embodiment show examples of the configuration and the shape of the specimen retrieval device according to the present invention and the disposition of each member forming the specimen retrieval device, and do not limit the present invention. In addition, the drawings do not necessarily accurately represent the dimensional ratio such as the length, the width, and the height of the specimen retrieval device. In all of the drawings, the same reference numerals will be assigned to the same components, and description thereof will be appropriately omitted.

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

[0013] As shown in Fig. 1, the specimen retrieval bag 1 according to the first embodiment includes a bag body 2 including a storage portion 2b that stores a specimen (excision piece 10 shown in Fig. 4) via an opening 2a. The bag body 2 is obliquely inclined downward from the opening 2a to a tip portion (back end portion 2c) on a side opposite to the opening 2a.

[0014] The "specimen" refers to an organ, a vital organ, a tissue, or a portion thereof, or a combination thereof, which is collected from a human body during a surgery, an examination, or the like. In other words, the term "inclined downward" means extending with both a component in a direction intersecting with a central axis of the opening 2a and a component in a direction away from the opening 2a when viewed in an extending direction of the central axis.

[0015] In a surgical treatment (thoracoscopic surgery) using the specimen retrieval bag 1, the specimen retrieval bag 1 is inserted into a body cavity via a hole (incision wound 30a (shown in Fig. 4 to be described later) to which an incision wound guard 20 of a retractor (not shown) is attached) opened substantially perpendicularly to an extending direction of the body cavity. The specimen (excision piece 10) is stored in the storage portion 2b, and is retrieved out of the body. According to the above-described configuration, since the bag body 2 is obliquely inclined downward, it is possible to suppress a possibility that the bag body 2 comes into contact with other organs or body walls in the above-described series of surgical treatments. In addition, compared to a specimen retrieval bag in the related art, it is possible to suppress a possibility that the bag body 2 protrudes in a direction intersecting with a perforation direction of the incision wound 30a in a state where the removed specimen is stored. Therefore, the bag body 2 is easily retrieved from the inside of the body via the incision wound 30a.

[0016] In particular, as described above, since the incision wound 30a provided during the thoracoscopic surgery is provided in a limited range in the intercostal space, thereby limiting a size of the hole. When the bag body 2 related to the specimen retrieval bag 1 is put into the thoracic cavity, the specimen is stored in the storage portion 2b, and is retrieved out of the body via the incision wound 30a, it is necessary to pass the bag body 2 through the incision wound 30a having a limited size of the hole. In the thoracoscopic surgery, since the possibility that the bag body 2 of the specimen retrieval bag 1 protrudes from the opening 2a is suppressed, the specimen retrieval bag 1 can be preferably used.

[0017] <First Embodiment> The specimen retrieval bag 1 according to the first embodiment will be mainly described with reference to Fig. 1. The specimen retrieval bag 1 according to the present embodiment is used when the specimen excised by an excising device such as a stapler is retrieved to the outside.

[0018] For example, the specimen stored in the specimen retrieval bag 1 is an intrathoracic organ. That is, the bag body 2 is used for storing the intrathoracic organ. The intrathoracic organ stored in the specimen retrieval bag 1 according to the present embodiment is a lung (particularly, a portion of a lung (excision piece 10)). That is, the bag body 2 is used for storing the lung. In addition to the lung, examples of the "intrathoracic organ" include a trachea, a bronchus, a heart, an aorta, a superior vena cava, an esophagus, a thymus, and a nerve. That is, the specimen stored in the specimen retrieval bag 1 includes the lung, the trachea, the bronchus, the heart, the aorta, the superior vena cava, the esophagus, the thymus, the nerve, or a portion thereof, or a combination thereof. The specimen retrieval bag 1 can preferably store the intrathoracic organ (specimen) in the thoracoscopic surgery performed via the incision wound 30a. The specimen stored in the specimen retrieval bag 1 may be used for storing the organ, the vital organ, the tissue, or a portion thereof other than the intrathoracic organ.

[0019] As described above, the specimen retrieval bag 1 further includes the bag body 2 including the storage portion 2b having the opening 2a and storing the excision piece 10, the string body 4 for opening and closing the opening 2a, and the storage tube 5 that can store the string body 4 and the bag body 2.

[0020] (Bag Body) The bag body 2 according to the present embodiment is formed of polyurethane. The bag body 2 is formed to be tapered toward the back end portion 2c side from the base end portion 2d side provided with the opening 2a, and is formed to be longitudinally elongated. The back end portion 2c is formed in a semicircular shape in a front view. As a material for forming the bag body 2, it is preferable to select a highly slidable material to easily insert the excision piece 10 into the storage portion 2b. In addition to polyurethane, examples of this material include silicone, polyethylene, polypropylene, and a soft polyvinyl chloride resin.

[0021] In addition, as a material for forming the bag body 2, it is preferable to select a material having high tear strength and elasticity, and examples of particularly preferable materials include polyurethane as described above. Since this material is used, when the specimen retrieval bag is retrieved out of the body in a state where the removed specimen is stored, deformation of the bag body 2 and the specimen is promoted, and the possibility that the storage portion 2b protrudes can be further suppressed. Therefore, even in a case of a small incision wound, the bag body 2 is easily retrieved from the inside of the body. In particular, it is preferable that the bag body 2 has elasticity (flexibility) in a depth direction. Specifically, it is preferable that the bag body 2 storing the excision piece 10 (specimen) has elasticity to such an extent that deformation of the excision piece 10 can be allowed in the depth direction, when the bag body 2 is retrieved out of the body cavity after passing through the intercostal space and the incision wound 30a. That is, it is preferable that the bag body 2 can allow deformation in which the excision piece 10 is elongated and a cross-sectional area thereof is reduced. According to this configuration, an operator causes the bag body 2 storing the excision piece 10 to easily pass through the intercostal space and the incision wound 30a. For example, regarding the material for forming the bag body 2, it is preferable that breaking elongation is 530% or more and tensile stress when the material is stretched by 100% is 6 ± 2 MPa.

[0022] Furthermore, it is preferable that an inner surface of the bag body 2 is subjected to a release treatment with a coating agent, for example, such as a fluorine coating so that the excision piece 10 can be preferably stored by improving slidability of the excision piece 10 and causing the excision piece 10 to slide to the back end portion 2c of the storage portion 2b.

[0023] In particular, it is preferable that the inner surface of the bag body 2 is subjected to the fluorine coating, a silicone coating, or other water-repellent coating. According to this configuration, it is possible to suppress a possibility that the inner surfaces of the bag body 2 are stuck to each other, and the inside of the bag body 2 can be easily widened when the excision piece 10 is stored. An outer surface of the bag body 2 may also be subjected to the same coating. According to this configuration, the bag body 2 can smoothly enter the inside of the body and can exit from the inside of the body without the bag body 2 being caught on the inner wall surface of the incision wound 30a, the rib bones, and the like. In addition, as will be described later, when the bag body 2 is stored in the storage tube 5, it is possible to suppress a possibility that the outer surfaces of the folded bag body 2 are stuck to each other.

[0024] Since the bag body 2 is foldable, the bag body 2 can be stored in the storage tube 5. The bag body 2 may not necessarily be stored inside the storage tube 5, and only the string body 4 may pass through the storage tube 5.

[0025] A volume of the storage portion 2b which is an internal space of the bag body 2 in an expanded state is 500 mL or more, more preferably 550 mL or more, 1,000 mL or less, and still more preferably 950 mL or less. According to the above-described configuration, a portion of an excised lung can be preferably stored.

[0026] As shown in Fig. 1, a bent portion 2h that is smoothly bent between the tip portion (back end portion 2c) and the opening 2a is formed in the storage portion 2b. More specifically, on the inner surface of the bag body 2 that defines the storage portion 2b, the bent portion 2h on the outer edge side shown in Fig. 1 is smoothly bent with respect to a virtual center of curvature. The term “bent” according to the present invention includes a shape that is bent with a rounded corner, and is a concept including a curve. The term "smooth" means a curve having no bent point (point where a tangent line is discontinuous), and the term "smoothly bent" means that an inclination of the tangent line at each portion of the curve is continuously changed without being interrupted. According to the above-described configuration, since the bent portion 2h that is smoothly bent is provided, the excision piece 10 can be disposed in the back end portion 2c of the storage portion 2b by improving the slidability of the specimen (excision piece 10).

[0027] As shown in Fig. 1, in the storage portion 2b, a portion inclined downward to the tip portion (back end portion 2c) is continuous, and a portion parallel to the opening 2a is not formed. According to the above-described configuration, since the portion inclined downward in the storage portion 2b is continuous, the excision piece 10 can be disposed in the back end portion 2c of the storage portion 2b by improving the slidability of the specimen (excision piece 10).

[0028] (Handheld Portion) The specimen retrieval bag 1 includes the string body 4 whose shape is not memorized and which has no elastic restoring force, in order to tie the opening 2a of the bag body 2. Two string bodies 4 are provided to slidably pass through the storage tube 5, and a passing tip passes through an edge (for example, a folded portion (not shown)) forming the opening 2a of the bag body 2. The string body 4 is pulled to shorten a pulling-out length from the storage tube 5. In this manner, the opening 2a of the bag body 2 can be tied.

[0029] <Modification Example> The bag body 2 of the specimen retrieval bag 1 according to the above-described embodiment is formed to be elongated on the back side (back end portion 2c side) which is a storage direction of the excision piece 10 as shown in Fig. 1, but the specimen retrieval bag according to the present invention is not limited to those formed in this way. Next, a bag body 42 of the specimen retrieval bag 1 according to a modification example will be described mainly with reference to Fig. 2. Fig. 2 is a view showing a storage portion 42b of the bag body 42 forming the specimen retrieval bag 1 according to the modification example, and is a view for describing a storage portion 42b in a state where the bag body 42 is contracted to be flat (portions of the inner surfaces of the bag body 42 are in surface contact with each other). More specifically, Fig. 2 shows an inner surface portion of the bag body 42.

[0030] As shown in Fig. 2, in the bag body 42 according to the present example, a length W in a direction parallel to one direction on a virtual plane including the opening 2a is longer than a length L2 in a direction perpendicular to the opening 2a. In other words, the bag body 42 of the specimen retrieval bag 1 according to the present example is formed in a horizontally long shape.

[0031] The "length W in the parallel direction" and the "length L2 in the perpendicular direction" mean magnitudes of respective direction components in the whole bag body 42, and do not mean the lengths of the portions extending in parallel and the lengths of the portions extending perpendicularly. According to the above-described configuration, when the specimen retrieval bag 1 is inserted into an abdominal cavity, the specimen retrieval bag 1 can be disposed along the abdominal cavity. The length W which is a horizontal width of the storage portion 42b according to the present example is preferably 250 mm or larger, more preferably 300 mm or larger, 400 mm or smaller, still more preferably in a range of 350 mm or smaller, and is 320 mm, for example. A vertical length L2 of the storage portion 42b is preferably 150 mm or larger, more preferably 210 mm or more and 300 mm or smaller, and still more preferably 230 mm or less.

[0032] The opening 2a according to the present example is formed in an elliptical shape, and as the size of the opening 2a, a minor diameter is 30 mm or larger, more preferably 50 mm or larger and 100 mm or smaller, still more preferably 90 mm or smaller, and is 80 mm, for example. A major diameter is 80 mm or larger and 200 mm or smaller, more preferably 180 mm or smaller, and is 160 mm, for example. An opening area of the opening 2a is 60 cm2or larger, more preferably 70 cm2or larger, still more preferably 75 cm2or larger and 120 cm2or smaller, still more preferably 100 cm2or smaller, and still more preferably 90 cm2or smaller.

[0033] According to the above-described configuration, since the opening area of the opening 2a is 60 cm2or larger, a portion of the excised lung can preferably pass through the opening 2a. In addition, since the opening area of the opening 2a is 120 cm2or smaller, the opening 2a easily passes through the incision wound 30a. In addition, the opening 2a is deformable, and the shape of the opening 2a is not limited to the elliptical shape.

[0034] A peripheral length of the opening 2a is 160 mm or larger, more preferably 300 mm or larger, still more preferably 320 mm or larger and 400 mm or smaller, still more preferably 380 mm or smaller, and still more preferably 340 mm or smaller. When an expandable / contractible material is used for the storage portion 42b, the peripheral length of the opening 2a represents a length in a state where no external force is applied (natural state). In a state where the bag body 42 is expanded in the radial direction while a central line C is set as a reference, a portion of the opening 2a has an elliptical shape, and other portions are formed in a circular shape in a cross section.

[0035] As shown in Fig. 2, the bag body 42 includes an inner edge 2p close to a bending center side and an outer edge 2q separated from the bending center side on the inner surface of the bag body 42. As shown in Fig. 2, an upper inner edge LA on the opening side of the inner edge 2p of the storage portion 42b extends perpendicularly downward by the length L1 from the opening 2a. The inner edge 2p of the storage portion 42b is bent from the upper inner edge LA toward the back end portion 2c. The length L1 is 60 mm or larger, preferably 80 mm or larger, 120 mm or smaller, preferably 100 mm or smaller, and is 90 mm, for example. Here, the "inner edge 2p" refers to a side edge of a side close to a center of an approximate circle in contact with a bent portion of the side edge, in the side edge that defines the storage portion 42b of the bag body 42, and the "outer edge 2q" refers to a side edge of a side far from the center of the approximate circle in contact with the bent portion of the side edge.

[0036] The inner edge 2p according to the present example is provided with at least one discontinuous point P1 where a curvature is discontinuous. In the storage portion 42b in a state where the bag body 42 is expanded, an area of a cross section A1 parallel to the opening 2a including a point (discontinuous point P1) closest to the opening side in the discontinuous points is 40 cm2or larger, more preferably 50 cm2or larger and 80 cm2or smaller, and still more preferably 70 cm2or smaller. With regard to “the curvature is discontinuous”, in the inner edge 2p according to the present embodiment shown in Fig. 2, the upper inner edge LA linearly extending and the lower inner edge LB extending in a curved manner are connected. In this manner, the curvature is discontinuously formed. That is, “the curvature is discontinuous” includes a configuration in which a straight line having the curvature of 0 and a curved line having the curvature are connected.

[0037] On the other hand, the inner edge 2p provided with the discontinuous point P1 is not limited to those formed by the upper inner edge LA linearly extending and the lower inner edge LB extending in the curved manner, and may be configured such that a plurality of curves having different curvatures are connected. That is, the inner edge 2p may be formed to form a curve as a whole.

[0038] According to the above-described configuration, since the area of the cross section A1 is 40 cm2or larger, a portion of the excised lung is easily stored below the portion of the cross section A1. A portion of the lung disposed below the portion of the cross section A1 reaches below the discontinuous point P1, and the diameter of the portion is reduced while an orientation is changed toward the back end portion 2c side. Therefore, the portion of the lung can be preferably stored on the back end portion 2c side. On the other hand, since the area of the cross section A1 is 80 cm2or smaller, bulkiness of the bag body 42 can be suppressed, and the bag body 42 easily passes through the incision wound 30a even in a state where the portion of the lung is stored inside the bag body 42.

[0039] In the storage portion 42b in a state where the bag body 42 is expanded, an area of a cross section A2 perpendicular to the central line C of the storage portion 42b and including the discontinuous point P1 shown in Fig. 2 is 25 cm2or larger, preferably 30 cm2or larger and 45 cm2or smaller, and preferably 40 cm2or smaller. Here, when a plurality of discontinuous points are provided in the inner edge 2p, the cross section A2 is a surface including the discontinuous point P1 closest to the opening side. In the present embodiment, the diameter (major diameter) of the cross section A2 in a state where the bag body 42 is expanded is 40 mm or larger, preferably 50 mm or larger and 80 mm or smaller, preferably 70 mm or smaller, and is approximately 67 mm, for example. According to the above-described configuration, since the area of the cross section A2 is 25 cm2or larger, the portion of the excised lung easily passes through the back end portion 2c side. On the other hand, since the area of the cross section A2 is 45 cm2or smaller, the bulkiness of the bag body 42 can be suppressed, and the bag body 42 easily passes through the incision wound 30a even in a state where the portion of the lung is stored inside the bag body 42.

[0040] In addition, it is preferable that the area of the cross section A1 parallel to the opening 2a is equal to or larger than 1.3 times, more preferably equal to or larger than 2 times and equal to or smaller than 4 times, and still more preferably equal to or smaller than 3 times the area of the cross section A2 perpendicular to the central line C of the storage portion 42b including the point closest to the opening 2a side in the discontinuous points P1 in the storage portion 42b. According to the above-described configuration, since the area of the cross section A1 is equal to or larger than 1.3 times the area of the cross section A2, the portion of the excised lung can be preferably compressed and deformed. In addition, since the area of the cross section A1 is equal to or smaller than four times the area of the cross section A2, a sudden change in the cross-sectional area can be suppressed, and the portion of the excised lung can be smoothly delivered to the back end portion 2c.

[0041] In addition, as shown in Fig. 2, the outer edge 2q in the side edge of the storage portion 42b of the bag body 42 is formed with the curve having two curvature radii R1 and R2, and the lower inner edge LB in the inner edge 2p is formed with one curvature radius R3. A portion formed with the curvature radii R1 and R2 is referred to as a bent portion 2i. The curvature radius R2 is larger than the curvature radius R1.

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

[0043] As shown in Fig. 2, the back end portion 2c of the storage portion 42b is formed in a semicircular shape (partially circular arc shape) in a cross section having a diameter D2. The storage portion 42b is formed such that a width between the bent portion (lower inner edge LB) formed with the curvature radius R3 on the inner edge 2p side and the bent portion 2i on the outer edge 2q side is continuously reduced to the back end portion 2c. Since the storage portion 42b is formed in this way, the excision piece 10 can be smoothly stored to the back end portion 2c of the storage portion 42b.

[0044] In the present example, the storage portion 42b has been described as an example in which the discontinuous point P1 where the curvature is discontinuous is provided in the inner edge 2p, but the present invention is not limited to this configuration. That is, without providing the discontinuous point P1, the inner edge 2p may be formed such that the curvature is continuous.

[0045] It is preferable that the peripheral length of the inner surface of the storage portion 42b, which intersects with the cross section perpendicular to the central line C of the storage portion 42b, decreases from the opening 2a to the tip portion (back end portion 2c) on the opposite side of the opening 2a, regardless of the presence or absence of the discontinuous point P1. Here, the term "decreased" means that the peripheral length does not increase in the middle (from the opening 2a to the tip portion on a side opposite to the opening 2a), and also includes a range of the same peripheral length.

[0046] In an embodiment in which the presence or absence of the discontinuous point P1 does not matter, the central line C can be specified in a state where the storage portion 42b is crushed so that the storage portion 42b does not overlap the bag body 42 in a relaxed state. The crushed state is a state where the inner edge 2p and the outer edge 2q which are located at positions facing the opening 2a at 180 degrees in a direction perpendicular to the opening 2a are formed by crushing the storage portion 42b.

[0047] The central line C is a line connecting intermediate points of straight lines in a shortest distance between the inner edge 2p and the outer edge 2q from the opening 2a to the tip portion (back end portion 2c). The peripheral length of the inner surface of the storage portion 42b, which intersects with the cross section perpendicular to the central line C, is a length twice a distance between a contact point with the inner edge 2p and a contact point with the outer edge 2q on the straight line perpendicular to the central line C in a state where the storage portion 42b is crushed. In addition, preferred ranges of the peripheral length of the opening 2a and the volume of the storage portion 2b which is the internal space of the bag body 42 are the same as the above-described ranges. Here, the volume of the storage portion 2b which is the internal space refers to a volume in a maximally expanded state within a range in which a material of the storage portion 2b does not expand.

[0048] In the embodiment in which the presence or absence of the discontinuous point P1 does not matter, with respect to the length of the central line C from the opening 2a to the tip portion (back end portion 2c), at any position of 20% or larger, preferably 25% or larger, and 40% or smaller, preferably 35% or smaller from the opening 2a, the peripheral length of the inner surface of the bag body 42, which intersects with the cross section perpendicular to the central line C, is preferably a length of 60% or larger, preferably 65%, and 80% or smaller, preferably 75% or smaller with respect to the peripheral length of the opening 2a. In this manner, the portion of the excised lung easily passes through the opening 2a, and the storage portion 42b storing the lung is easily retrieved from the incision wound.

[0049] In addition, the tip portion (back end portion 2c) of the bag body 42 according to the present embodiment is formed in a partial sphere shape having the diameter of 50 mm or larger and 100 mm or smaller in a state where the bag body 42 is expanded. Since the back end portion 2c is formed in this way, the specimen can be smoothly stored inside the back end portion 2c. The "partial sphere shape" includes not only a hemispherical shape but also a shape including an arc that does not satisfy a central angle of 180 degrees in a longitudinal cross section. However, the present invention is not limited to this configuration, and can have any shape as long as the specimen can be stored to a tip of the back end portion 2c. The diameter D2 according to the present embodiment in a state where the bag body 42 is expanded is approximately 35 mm.

[0050] <Second Embodiment> The specimen retrieval bag 1 according to the above-described embodiment has a configuration in which the inner surface of the bag body 2 has a smoothly tapered shape or the like. In this manner, the excision piece 10 can be preferably stored by improving slidability of the bag body 2. However, the present invention is not limited to this configuration, and a mechanism (pushing mechanism 3) that pushes the excision piece 10 to be unevenly disposed in a portion of the storage portion 2b may be provided.

[0051] A specimen retrieval bag 1A according to a second embodiment including a pushing mechanism 3 formed in this way will be described mainly with reference to Figs. 3 to 5. Fig. 3 is a schematic front view showing the specimen retrieval bag 1A according to the second embodiment. Fig. 4 is a schematic view showing a state where the specimen (excision piece 10) is stored in the specimen retrieval bag 1A, and Fig. 5 is a schematic view showing a state where an expansion / contraction portion 3a is expanded to push the excision piece 10 toward the opening 2a. In Figs. 4 and 5, the expansion / contraction portion 3a is shown in a simplified manner. In practice, the expansion / contraction portion 3a is formed on an entire inner peripheral surface (at least a portion of an inner peripheral surface may be used) of the bag body 2, and is expanded in a floating ring shape to protrude to the storage portion 2b side.

[0052] The specimen retrieval bag 1A further includes the pushing mechanism 3 that pushes the excision piece 10 to be unevenly disposed in a portion of the storage portion 2b. As shown in Figs. 4 and 5, the pushing mechanism 3 is the expansion / contraction portion 3a that expands when a fluid (in the present embodiment, air) is supplied and that contracts when the fluid is discharged. The expansion / contraction portion 3a expands to narrow the storage portion 2b when the fluid is supplied. The expansion / contraction portion 3a is provided in the tip portion (back end portion 2c) of the bag body 2. The expansion / contraction portion 3a is formed of a flexible resin material or the like, and has a filling space that can be filled with the fluid.

[0053] As the “fluid”, any fluid can be applied as long as the fluid can be supplied into and discharged from the expansion / contraction portion 3a, and for example, in addition to the air in the present embodiment, a liquid such as water and physiological saline may be used. The expansion / contraction portion 3a includes a sheet 2g attached to the inner surface of the bag body 2 with a space therebetween, and expands and contracts when the air enters and exits from the space.

[0054] In particular, since the sheet 2g functions as the expansion / contraction portion 3a, it is preferable that the sheet 2g has higher elasticity than the bag body 2 to which the sheet 2g is attached. For example, in order to adjust the elasticity of the sheet 2g, it is preferable that a thickness of the sheet 2g is smaller than a thickness of the bag body 2 (for example, the thickness is set to 1 / 2). However, the elasticity may be adjusted not only by adjusting the thickness of the sheet 2g but also by selecting a material for forming the sheet 2g.

[0055] As described above, in the expansion / contraction portion 3a in the present embodiment, a portion of the back end portion 2c of the bag body 2 has a configuration including two sheets 2g. External air is supplied between the two sheets of the back end portion 2c by a rubber ball 3b and a tube 3c (to be described later). In this manner, the sheet 2g on the inner surface side of the two sheets protrudes to narrow the storage portion 2b.

[0056] According to the above-described configuration, the fluid is supplied to the expansion / contraction portion 3a to expand the expansion / contraction portion 3a. In this manner, as shown in Fig. 5, the storage portion 2b can be narrowed, and the specimen (excision piece 10) can be unevenly disposed in a portion (in the present embodiment, the opening 2a side). Therefore, the movement of the excision piece 10 to the opening side (out of the body) can be preferably assisted. In addition, the storage portion 2b of the excision piece 10 can be widened by discharging the fluid from the expansion / contraction portion 3a, and in the present embodiment, the excision piece 10 can be stored to a back side of the storage portion 2b.

[0057] As shown in Fig. 3, the specimen retrieval bag 1A includes the tube 3c connected to the expansion / contraction portion 3a to supply the fluid (gas) into the expansion / contraction portion 3a. It is preferable that at least a portion of the tube 3c is disposed along the inner surface of the bag body 2. The description "along the inner surface of the bag body 2" means that the bag body 2 is at least not exposed on the outer surface, and includes not only a configuration in which the portion is disposed along the inner surface of the bag body 2 but also a configuration in which the portion is disposed along the inner surface by being embedded into the thick wall of the bag body 2.

[0058] According to the above-described configuration, since the portion of the tube 3c is disposed along the inner surface of the bag body 2, it is possible to avoid a possibility that a procedure is hindered due to contact with a hand of an operator or surrounding items. In addition, invasiveness can be reduced by preventing the tube 3c from hitting a body cavity wall (thoracic cavity wall).

[0059] As shown in Fig. 3, the specimen retrieval bag 1A includes an operation unit (rubber ball 3b) which can supply the fluid (gas) to the expansion / contraction portion 3a via the tube 3c. In the rubber ball 3b, two check valves 3d are provided at positions across an expansion / contraction portion of the rubber ball 3b. The two check valves 3d restrict an outward leakage of the fluid while the fluid is incorporated into the expansion / contraction portion 3a.

[0060] The operation unit which can supply the fluid to the expansion / contraction portion 3a may be a syringe or the like in addition to the rubber ball 3b. For example, as the check valve 3d, a duckbill valve may be used, but the check valve 3d is not limited to the duckbill valve as long as the outward leakage of the fluid can be restricted. In addition, a three-way stopcock (not shown) is connected to the rubber ball 3b, and the three-way stopcock is configured as follows. The fluid in the expansion / contraction portion 3a is discharged out of the body such that the expansion / contraction portion 3a contracts. According to the above-described configuration, the gas (fluid) can be easily supplied to the expansion / contraction portion 3a by operating the operation unit (rubber ball 3b).

[0061] In addition, a tip opening of the tube 3c to which the rubber ball 3b is connected is directed toward a back side (back end portion 2c side) with respect to a central portion in a depth direction (storage direction) with respect to the expansion / contraction portion 3a. Therefore, the air (fluid) supplied from the tube 3c is supplied from the back side of the expansion / contraction portion 3a, and a load is easily applied to push the excision piece 10 stored in the storage portion 2b to the opening 2a side.

[0062] In addition, the specimen retrieval bag 1A may include a string body 24 (wire) shown in Fig. 4 in an edge of the opening 2a, instead of the string body 4 shown in Figs. 1 and 3, whose shape is not memorized and which has no elastic restoring force. That is, as shown in Fig. 4, it is preferable that the specimen retrieval bag 1A further includes the string body 24 provided in the edge of the opening 2a, and the shape of the string body 24 is memorized such that the opening is in an open state. According to the above-described configuration, the shape of the string body 24 is memorized such that the opening 2a is in the open state. In this manner, the opening 2a is opened only by pulling out the string body 24 from the storage tube 5 without any particular operation, and the specimen (excision piece 10) is easily stored inside the body cavity (thoracic cavity).

[0063] As shown in Fig. 3, the specimen retrieval bag 1A according to the present embodiment further includes a handheld portion (including the string body 4 or the string body 24 and the storage tube 5) gripped by a user to open and close the opening 2a of the bag body 2. The handheld portion (string body 4) is pulled out to one side (one side on a virtual plane including the opening 2a) with respect to the bag body 2. The tip portion (back end portion 2c) provided in the bag body 2 is disposed on one side with respect to the opening 2a.

[0064] That is, the bag body 2 is bent by the bent portion 2h such that the back end portion 2c of the bag body 2 is located in a direction in which the string body 4 is pulled out from the bag body 2. The “handheld portion” according to the present invention does not necessarily have a function of opening and closing the opening 2a of the bag body 2 as described above. For example, a rod-like member simply attached to the bag body 2 without this function may be used.

[0065] According to the above-described configuration, as shown in Fig. 4, when the specimen retrieval bag 1 is inserted into the body cavity via the incision wound 30a by gripping the handheld portion (storage tube 5), the bag body 2 is bent to the handheld portion (storage tube 5) side. In this manner, the bag body 2 can be disposed along the inner surface of the body wall 30.

[0066] Therefore, the bag body 2 can be widely disposed inside the body cavity widened longer in a body length direction (left-right direction in Fig. 4) than in a body thickness direction (up-down direction in Fig. 4), the excision piece 10 is easily stored in the bag body 2, and the excision piece 10 is preferably collected.

[0067] However, the present invention is not limited to this configuration. As shown in Fig. 1, the bag body 2 having a bent configuration is not excluded from the handheld portion (string body 4 and the storage tube 5) side in a different direction. The bag body 2 may be obliquely inclined downward at least from the opening 2a to the tip portion (back end portion 2c) on the side opposite to the opening 2a. In a case of the specimen retrieval bag 1 including this bag body 2, the bag body 2 is easily disposed widely inside the body cavity, compared to a case of a bag extending in a direction perpendicular to a virtual plane including the opening 2a.

[0068] <Third Embodiment> The expansion / contraction portion 3a according to the above-described embodiment has been described as an example provided on the back end portion 2c side of the bag body 2, but the present invention is not limited to this configuration. Next, a specimen retrieval bag 1B according to a third embodiment including an expansion / contraction portion 13a provided on a near side (base end portion 2d side) of the opening 2a of the bag body 2 will be described mainly with reference to Fig. 6.

[0069] Fig. 6 is a schematic front view showing the specimen retrieval bag 1B provided with a filter 14 according to the third embodiment. As shown in Fig. 6, the expansion / contraction portion 13a provided in the specimen retrieval bag 1B according to the present embodiment is provided in the vicinity of the opening 2a of the bag body 2, unlike the expansion / contraction portion 3a according to the second embodiment. The expansion / contraction portion 13a expands to narrow the vicinity of the opening 2a of the storage portion 2b by the supplied fluid (gas).

[0070] The “vicinity of the opening 2a of the bag body 2” in which the expansion / contraction portion 13a is provided means that the expansion / contraction portion 13a is provided in the bag body 2 at least on the opening 2a side with respect to the center in the storage direction. When the “vicinity of the opening 2a of the bag body 2" in which the expansion / contraction portion 13a is provided is located within a range of a distance of 1 / 3 from the opening 2a side in the depth direction (storage direction) of the storage portion 2b, a load is easily applied to the excision piece 10 stored in the storage portion 2b in the depth direction. Therefore, it is preferable to adopt this configuration.

[0071] According to the above-described configuration, since the fluid is supplied to the expansion / contraction portion 13a, the vicinity of the opening 2a of the storage portion 2b can be narrowed, and the specimen (excision piece 10) can be pushed to the back side of the storage portion 2b. In addition, since the fluid is discharged from the expansion / contraction portion 13a, the excision piece 10 stored in the bag body 2 is easily taken out of the body by placing the bag body 2 in a contractible state, and the specimen retrieval bag 1B is easily discharged out of the body together with the excision piece 10.

[0072] As shown in Fig. 6, the bag body 2 has a flare portion 2f widened from the back side (back end portion 2c side) of the storage portion 2b toward the side of the opening 2a in the vicinity of the opening 2a. The expansion / contraction portion 13a according to the present embodiment is formed in the flare portion 2f of the bag body 2. In particular, it is preferable that the expansion / contraction portion 13a is formed such that the width of the internal space that surrounds 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 toward the opening 2a side of the storage portion 2b.

[0073] In addition, the tube 3c to which the rubber ball 3b is connected is connected to the opening 2a side with respect to a central portion in the depth direction with respect to the expansion / contraction portion 13a. Therefore, the air (fluid) supplied from the tube 3c is supplied from the opening 2a side of the expansion / contraction portion 13a, and a load is easily applied to push the excision piece 10 stored in the storage portion 2b to the back side of the storage portion 2b.

[0074] As shown in Fig. 6, a discharge opening 15 through which the storage portion 2b and the outside communicate with each other is provided in the back end portion 2c opposite to the opening 2a in the bag body 2. The discharge opening 15 is blocked by the filter 14 through which the gas passes and the liquid does not pass. The filter 14 is preferably a hydrophobic filter. The description " the liquid does not pass" means a state where the liquid (blood) does not leak out at a pressure applied to such an extent that the expansion / contraction portion 13a is expanded.

[0075] According to the above-described configuration, the discharge opening 15 is provided and the gas can be discharged outward (out of the storage portion 2b). In this manner, it is possible to prevent pushing of the excision piece 10 from being hindered due to an increase in an internal pressure of the storage portion 2b when the specimen (excision piece 10) is pushed to the back side of the bag body 2 by the pushing mechanism 13. Furthermore, since the filter 14 is provided in the discharge opening 15, a portion of the excision piece 10, a body fluid such as blood, or the like can be prevented from leaking out of the bag body 2.

[0076] In the bag body 2, a traction string 17 is attached to an end portion of a pushing destination of the pushing mechanism 13. A ring 17a is attached to a base end portion of the traction string 17. An operator can hook a finger on the ring 17a, and can pull out the back end portion 2c of the bag body 2 to the incision wound 30a side.

[0077] According to the above-described configuration, since the traction string 17 is attached to the end portion of the pushing destination of the pushing mechanism 13 in the bag body 2, the specimen (excision piece 10) stored in a thin state in the pushing destination as described below is easily retrieved by taking the specimen (excision piece 10) into the body from the traction string 17 side.

[0078] <Fourth Embodiment> In the above-described embodiment, a configuration in which the air in the back end portion 2c is discharged by the discharge opening 15 when the excision piece 10 is pushed into the back end portion 2c of the storage portion 2b has been described, but the present invention is not limited to this configuration. Next, a specimen retrieval bag 1C according to a fourth embodiment including a lumen 16 will be described mainly with reference to Fig. 7. Fig. 7 is a schematic view for describing the specimen retrieval bag 1C according to the fourth embodiment.

[0079] As shown in Fig. 7, the lumen 16 extending to the back end portion 2c of the storage portion 2b and the base end portion 2d on a side of the opening 2a, in which the gas inside the storage portion 2b passes through the opening 2a is provided in the bag body 2 of the specimen retrieval bag 1C according to the present embodiment. The lumen 16 is provided separately from the bag body 2, does not include a tube (not shown) attached to the bag body 2, and is formed in the bag body 2 itself by heat sealing, adhesion, or the like.

[0080] According to the above-described configuration, when the pushing mechanism 13 pushes the excision piece 10 to the back end portion 2c of the storage portion 2b, the gas can be discharged from the back end portion 2c to the base end portion 2d via the lumen 16. Therefore, it is possible to prevent the pushing of the excision piece 10 from being hindered due to an increase in the internal pressure of the storage portion 2b when the pushing mechanism 13 presses the excision piece 10, and it is possible to prevent a portion of the excision piece 10, the blood, or the like from leaking out of the bag body 2.

[0081] As shown in Fig. 7, the bag body 2 includes the flare portion 2f widened from the back side (back end portion 2c side) of the storage portion 2b toward the side of the opening 2a, in the vicinity of the opening 2a. It is preferable that a base end portion 16a of the lumen 16 extends along the flare portion 2f. That is, the lumen 16 is formed such that a portion formed in the flare portion 2f is wider in a diameter expanding direction than a portion formed in the storage portion 2b storing the excision piece 10.

[0082] According to the above-described configuration, when the excision piece 10 is put into the center of the opening 2a, the base end portion 16a of the lumen 16 serving as a discharge port of the air extends along the flare portion 2f. In this manner, a gap is likely to be formed between the lumen 16 and the excision piece 10, when the specimen (excision piece 10) is put into the center of the opening. Therefore, the excision piece 10 is less likely to block the lumen 16.

[0083] As shown in Fig. 7, it is preferable that a plurality of (two in the present embodiment) lumens 16 are provided to face each other across the center of the storage portion 2b. According to the above-described configuration, when the specimen (excision piece 10) is unevenly put into the storage portion 2b, even when one lumen 16 is blocked by the specimen, the return of the gas to the base end side can be maintained by the other lumen 16.

[0084] As shown in Fig. 7, the bent portion 2h is bent in an in-plane direction connecting the two lumens 16 facing each other across the center of the storage portion 2b. In the present embodiment, the bent portion 2h is bent in a direction separated from the side on which the storage tube 5 is disposed, but may be bent to the side on which the storage tube 5 is disposed. According to the above-described configuration, the bent portion 2h is bent in the in-plane direction connecting the two lumens 16 facing each other. In this manner, a bent shape and the lumen 16 can be formed at once by heat sealing.

[0085] The bag body 2 is formed of a resin film (for example, a sheet material formed of polyurethane). For example, the bag body 2 is formed by overlapping two sheet materials and bonding portions of the two sheet materials to each other. A front surface of the bag body 2 is formed of one sheet material of the two sheet materials, and a rear surface of the bag body 2 is formed of the other sheet material of the two sheet materials. It is preferable that the lumen 16 is formed by heat sealing portions of the two sheet materials forming the bag body 2 to each other in a line shape. As described above, in addition to polyurethane, the bag body 2 may be formed of silicone, polyethylene, polypropylene, soft polyvinyl chloride resin, or the like.

[0086] According to the above-described configuration, the lumen 16 can be easily formed by overlapping two sheet materials and performing heat sealing (high-frequency welding). However, the lumen 16 may be a fine hole formed inside the thick wall of the bag body 2 without depending on the heat sealing. When the bag body 2 is formed by performing the heat sealing using two sheet materials, at a position across the storage portion 2b of the bag body 2, a fin (not shown) protruding outward with respect to other portions may be provided by performing heat welding on inner surfaces of the two sheet materials.

[0087] Whether to provide the pushing mechanisms 3 and 13 can be optionally selected. For example, when the slidability of the bag body 2 is satisfactory, the pushing mechanism 3 or 13 is not necessarily required. In order to improve the slidability, for example, it is conceivable to adopt a polyurethane sheet or to perform a release treatment (coating).

[0088] <Fifth Embodiment> Next, a specimen retrieval device 100 according to a fifth embodiment will be described with reference to Figs. 8 to 24. Fig. 8 is a cross-sectional view taken along a line corresponding to line A-A shown in Fig. 13. In addition, hereinafter, a tip side (left side in Fig. 8) of the specimen retrieval device 100 will be referred to as a distal end side, and a base end side (right side in Fig. 8) thereof will be referred to as a proximal end side. In addition, a distal end portion means a certain range including a distal end (most distal end) and the periphery thereof, and a proximal end portion means a certain range including a proximal end (most proximal end) and the periphery thereof.

[0089] As shown in Fig. 8 and the like, the specimen retrieval device 100 according to the present embodiment includes the specimen retrieval bags (1, 1A, 1B, and 1C) of the present invention. In the example shown in Fig. 8 and the like, a bag body 42 in the above-described modification example is shown as the bag body, but the present invention is not limited to this example, and the bag body 2 in the first to fourth embodiments may be used. In addition, in Figs. 9 and 11, the specimen retrieval bag 1 is omitted in the drawings. The specimen retrieval device 100 is configured to place the opening 2a of the bag body 42 in an open state (refer to Fig. 21) and to place the opening 2a in the open state into a closed state (refer to Fig. 24). In the present invention, the open state of the opening 2a means a state where an opening area of the opening 2a is secured to such an extent that at least the specimen can enter and exit from the bag body 42, and is not necessarily limited to a state where the opening area of the opening 2a is maximized. In addition, in the present invention, the closed state of the opening 2a means a state where the opening area of the opening 2a is reduced compared to the above-described open state to such an extent that at least the entrance and the exit of the specimen from the inside of the bag body 42 is restricted, and is not necessarily limited to a state where the opening area of the opening 2a is minimized (state where the bag body 42 is completely sealed). The opening area of the opening 2a described herein is an area of a region defined by an edge forming the opening 2a in a virtual plane including the opening 2a. According to this configuration, the opening 2a of the bag body 42 can be easily opened and closed inside the body cavity (thoracic cavity). Therefore, the specimen (excision piece 10) is easily stored. Therefore, the removed specimen is easily retrieved out of the body in a state where the removed specimen is stored in the specimen retrieval bag 1.

[0090] As shown in Figs. 10 and 12, the specimen retrieval device 100 includes an extrusion operation unit 162 including a storage tube 110, a grip portion 120 fixed to the proximal end portion of the storage tube 110, and an inner shaft 130 inserted into the storage tube 110 to be slidable in the axial direction. The inner shaft 130 can move forward in the axial direction from a first position (refer to Figs. 10, 12, and the like) at which the bag body 42 is stored inside the storage tube 110 to a second position (refer to Figs. 9, 11, and the like) at which the bag body 42 is extruded from the storage tube 110.

[0091] According to this configuration, the bag body 42 can be easily inserted into the body cavity via the storage tube 110, and after being inserted into the body cavity, the bag body 42 can be quickly extruded from the storage tube 110 inside the body cavity.

[0092] In addition, as shown in Figs. 9 and 11, the specimen retrieval device 100 includes an opening operation unit 164 including the storage tube 110, the grip portion 120 fixed to the proximal end portion of the storage tube 110, the inner shaft 130 inserted into the storage tube 110 to be slidable in the axial direction, and the pair of elastic pieces 140 brought into a state where the distal end side is open in a natural state (refer to Figs. 9, 11, and the like). The pair of elastic pieces 140 are fixed to the distal end portion of the inner shaft 130, and hold the vicinity of the opening 2a. The inner shaft 130 can move forward in the axial direction from the first position (refer to Figs. 10, 12, and the like) at which the pair of elastic pieces 140 are stored inside the storage tube 110 to the second position (refer to Figs. 9, 11, and the like) at which the pair of elastic pieces 140 are exposed from the storage tube 110 to be in the natural state. Since the inner shaft 130 moves forward to the second position, the opening 2a can be elastically opened to be in an open state.

[0093] According to this configuration, the opening 2a of the bag body 42 can be easily brought into the open state inside the body cavity, and the open state of the opening 2a can be maintained. The “natural state” described herein means a state where at least the pair of elastic pieces 140 are released from constraint of the storage tube 110, and for example, the pair of elastic pieces 140 may be elastically deformed by a constraint force of a pair of string insertion portions 2ra or a fixing member 132 (to be described later).

[0094] In a case of the present embodiment, the storage tube 110, the grip portion 120, the inner shaft 130, and the pair of elastic pieces 140 of the specimen retrieval device 100 also serve as the extrusion operation unit 162 and the opening operation unit 164. In addition, in a case of the present embodiment, the first position of the extrusion operation unit 162 and the first position of the opening operation unit 164 are mutually the same position, and the second position of the extrusion operation unit 162 and the second position of the opening operation unit 164 are mutually the same position.

[0095] Therefore, in a state where the inner shaft 130 is located at the first position, the pair of elastic pieces 140 and the bag body 42 are stored inside the storage tube 110. Since the inner shaft 130 moves forward to the second position, the bag body 42 is extruded from the storage tube 110 together with the pair of elastic pieces 140, and the opening 2a can be elastically opened to be in an open state.

[0096] According to this configuration, inside the body cavity, an operation for extruding the bag body 42 from the storage tube 110 and an operation for placing the opening 2a in an open state can be performed in conjunction with each other. Therefore, the specimen (excision piece 10) can be quickly stored inside the bag body 42. However, the present invention is not limited to this example, and for example, the first position of the extrusion operation unit 162 and the first position of the opening operation unit 164 may be positions different from each other, and the second position of the extrusion operation unit 162 and the second position of the opening operation unit 164 may be positions different from each other. That is, in the axial direction, a position at which the bag body 42 is stored inside the storage tube 110 and a position at which the pair of elastic pieces 140 is stored inside the storage tube 110 may be different from each other. Similarly, in the axial direction, a position at which the bag body 42 is exposed from the storage tube 110 and a position at which the pair of elastic pieces 140 is exposed from the storage tube 110 may be different from each other.

[0097] In a state where the inner shaft 130 is located at the first position, the pair of elastic pieces 140 are constrained by the storage tube 110, and are stored inside the storage tube 110 together with the bag body 42 in a state where the distal end side is closed against an elastic restoring force of the elastic pieces 140. From this state, the inner shaft 130 is moved forward to the second position, and the distal end portion of the inner shaft 130 and the pair of elastic pieces 140 are exposed from the storage tube 110. In this manner, the bag body 42 is extruded from the storage tube 110, and the pair of elastic pieces 140 are elastically deformed from a closed state to an open state (natural state). Therefore, the opening 2a held by the pair of elastic pieces 140 can be elastically opened to be in an open state.

[0098] However, in the present invention, the specimen retrieval device 100 may not include the above-described extrusion operation unit 162. In this case, for example, the bag body 42 may be pulled out from the storage tube 110 by the elastic restoring force of the pair of elastic pieces 140 exposed from the storage tube 110, or an operator (user) may pinch a portion of the bag body 42 or a portion of the string body 4 to pull out the bag body 42 from the storage tube 110. Similarly, in the present invention, the specimen retrieval device 100 may not include the above-described opening operation unit 164. In this case, for example, the specimen retrieval device 100 may include a pair of arm portions (not shown) that oscillate and switch between a state where the distal end side is open and a state where the distal end side is closed, in accordance with an operation of the operator (user). The pair of arm portions hold the vicinity of the opening 2a, and the pair of arm portions are brought into an open state, thereby placing the opening 2a in an open state. Alternatively, as in the second embodiment described above, the opening 2a of the bag body 42 may be brought into an open state by the elastic restoring force of the string body including a wire.

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

[0100] As shown in Fig. 8, even in a case of the present embodiment, the specimen retrieval bag 1 includes the string body 4 provided in the edge of the opening 2a, and the string body 4 can bring the opening 2a into a closed state. As shown in Fig. 17(a) and the like, the bag body 42 includes a pair of string insertion portions 2ra each formed on one side and the other side of the edge of the opening 2a, into which the string body 4 is inserted. One of the pair of elastic pieces 140 is inserted into one of the pair of string insertion portions 2ra, and the other of the pair of elastic pieces 140 is inserted into the other of the pair of string insertion portions 2ra.

[0101] According to this configuration, one side and the other side of the edge of the opening 2a can be sufficiently separated from each other by the pair of elastic pieces 140, and the separated state can be maintained. Accordingly, the opening 2a can be brought into the open state with a sufficient opening diameter, and the opening diameter can be satisfactorily maintained.

[0102] More specifically, as described above, the bag body 42 includes the storage portion 42b including the opening 2a to store the excision piece 10. In a case of the present embodiment, the storage portion 42b includes a portion on the tip portion (back end portion 2c) side with respect to the pair of string insertion portions 2ra in of the bag body 42. In addition, in a case of the present embodiment, the bag body 42 is also formed of two sheet materials. In one sheet material of the two sheet materials, a portion forming one side of the edge of the opening 2a is folded back to form one string insertion portion 2ra. Similarly, in the other sheet material of the two sheet materials, a portion forming the other side of the edge of the opening 2a is folded back to form the other string insertion portion 2ra. The elastic piece 140 is inserted into the string insertion portion 2ra via an opening 2raa on one end (one end of the string insertion portion 2ra in a longitudinal direction) side of the string insertion portion 2ra.

[0103] As shown in Fig. 17(b) and the like, a portion of the string body 4 is a lead-out portion 4b led out from the pair of string insertion portions 2ra. A portion of the lead-out portion 4b is introduced into the storage tube 110, and forms a loop portion 4a. The lead-out portion 4b is led out toward the storage tube 110 via the opening 2raa on one end side of each of the pair of string insertion portions 2ra.

[0104] Furthermore, as shown in Figs. 17(a), 17(b), and the like, in a case of the present embodiment, the specimen retrieval bag 1 includes a fastener 50 formed in a tubular shape. One end portion of the string body 4 led out from the one string insertion portion 2ra to the inner shaft 130 side and the other end portion of the string body 4 led out from the other string insertion portion 2ra to the inner shaft 130 side are each inserted into the fastener 50 to be slidable.

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

[0106] The fastener 50 is slidable with respect to the string body 4 in both a direction in which the fastener 50 is closer to the opening 2a (direction away from the inner shaft 130) and a direction in which the fastener 50 is away from the opening 2a (direction closer to the inner shaft 130). Since the fastener 50 is slid with respect to the string body 4 in the direction closer to the opening 2a (string insertion portion 2ra), the opening 2a can be narrowed to reduce the opening area. In this way, the opening 2a can be finally brought into a closed state where the opening 2a is closed as a drawstring bag. In addition, the fastener 50 is slid with respect to the string body 4 in the direction away from the opening 2a (string insertion portion 2ra). In this manner, the opening area of the opening 2a in a closed state can be increased. In this way, the opening 2a can be finally brought into an open state. However, the present invention is not limited to this example, and the specimen retrieval device 100 may not include the fastener 50.

[0107] The pair of elastic pieces 140 is elastically deformable to have a self-expansion force. The pair of elastic pieces 140 in a closed state inside the storage tube 110 protrudes from the storage tube 110, and naturally expands to be in an open state. Here, the term "self-expansion" refers to a case where the elastic pieces 140 resist an external closing force and attempt to be opened by itself. In a case of the present embodiment, each of the pair of elastic pieces 140 is formed to have mutually the same shape and mutually the same dimension. However, in the present invention, each of the pair of elastic pieces 140 may be formed to have mutually different shapes and dimensions.

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

[0109] According to this configuration, an impact of the most distal end portion 146 of the elastic piece 140 on the bag body 42 can be properly softened when the inner shaft 130 is moved forward from the first position to the second position. The “natural state” described herein means a state where no external force is applied.

[0110] In a case of the present embodiment, the pair of elastic pieces 140 are disposed symmetrically with reference to an axis of the storage tube 110 by 180 degrees in the radial direction. More specifically, with reference to the axis of the storage tube 110, one elastic piece 140 is disposed on one side in the radial direction, and the other elastic piece 140 is disposed on the side (other side) opposite to the one side in the radial direction. The elastic piece 140 further includes a most proximal end portion (not shown) connected to the proximal side of the arc-shaped curved portion 142, in addition to the arc-shaped curved portion 142, the distal side portion 144, and the most distal end portion 146. The most proximal end portion is fixed to the distal end portion of the inner shaft 130 by the fixing member 132. As shown in Figs. 17(a) and 17(b), a groove-shaped insertion portion 134 extending in the axial direction is formed in a portion of an outer peripheral surface of the fixing member 132. The lead-out portion 4b of the string body 4 passes through the insertion portion 134, and is further introduced to the proximal side. In the elastic piece 140, a portion (arc-shaped curved portion 142, the distal side portion 144, and the most distal end portion 146) excluding the most proximal end portion is inserted into the string insertion portion 2ra. When the inner shaft 130 moves forward from the first position to the second position, the arc-shaped curved portion 142, the distal side portion 144, and the most distal end portion 146 are exposed from the storage tube 110. As shown in Fig. 17(b), the distal end portion of the most distal end portion 146 is gradually narrowed toward the distal side, and has a rounded shape. In this manner, the impact of the most distal end portion 146 of the elastic piece 140 on the bag body 42 can be further softened.

[0111] In a state where the pair of elastic pieces 140 are stored in the storage tube 110 (closed state), a boundary portion between the arc-shaped curved portion 142 and the distal side portion 144 or the vicinity thereof is in contact with an inner peripheral surface of the storage tube 110. In addition, in a state where the pair of elastic pieces 140 are stored in the storage tube 110 (same state), the most distal end portions 146 of the pair of elastic pieces 140 extend parallel to each other. For example, the term “parallel” described herein means that an angle formed by extending lines (not shown) of the most distal end portions 146 of the pair of elastic pieces 140 is smaller than 45 degrees. According to this configuration, a possibility that the most distal end portion 146 is hooked on the inner peripheral surface of the storage tube 110 can be suppressed, and the elastic piece 140 can be smoothly exposed from the storage tube 110.

[0112] For example, each of the pair of elastic pieces 140 is formed of a superelastic alloy such as Nitinol. For example, a plate thickness of each of the pair of elastic pieces 140 is preferably 0.1 mm or larger and 1.0 mm or smaller, and more preferably 0.3 mm or larger and 0.5 mm or smaller. For example, a width dimension (dimension in a direction perpendicular to the extending direction of the elastic piece 140) of the pair of elastic pieces 140 is preferably 2 mm or larger and 8 mm or smaller, and more preferably 3 mm or larger and 5 mm or smaller.

[0113] For example, the storage tube 110 is formed in a hollow tubular shape elongated in one direction, and is open in each of the distal end and the proximal end. The inner shaft 130 is inserted into a lumen of the storage tube 110, and is slidable in the axial direction with respect to the storage tube 110. More specifically, when the inner shaft 130 moves forward from the first position to the second position, the pair of elastic pieces 140 (and the bag body 42) are exposed outward from a distal end side opening of the storage tube 110 (protrude to the distal side). In a case of the present embodiment, an inner diameter and an outer diameter of the storage tube 110 are constant regardless of the position in the axial direction. However, the outer diameter and the inner diameter of the storage tube 110 may vary depending on the position in the axial direction.

[0114] As shown in Fig. 8 and the like, for example, the grip portion 120 is a hollow member and is formed in a tubular shape elongated in one direction, for example. The grip portion 120 is externally inserted into the proximal end portion of the storage tube 110, and a lumen of the grip portion 120 communicates with a lumen of the storage tube 110. More specifically, when the inner shaft 130 moves rearward from the second position, the proximal end portion (more specifically, a holding portion 135 to be described later) of the inner shaft 130 passes through the lumen of the storage tube 110, and is exposed outward from a proximal side opening 122 of the grip portion 120 (protrudes to the proximal side). As shown in Figs. 18(a) to 18(c) and the like, the proximal end portion 121a of the grip portion 120 has a larger diameter than other portions of the grip portion 120.

[0115] For example, the storage tube 110 is formed of a metal material such as stainless steel (SUS). In addition, for example, the grip portion 120 is formed of a resin material such as polyurethane or polyamide. The outer diameter of the storage tube 110 is not particularly limited, but is preferably 8 mm or larger and 14 mm or smaller. The inner diameter of the storage tube 110 is not particularly limited, but is preferably 9 mm or larger and 13 mm or smaller. In addition, a total length of the storage tube 110 is not particularly limited, but is preferably 200 mm or larger and 400 mm or smaller.

[0116] Here, as shown in Figs. 18(a) to 18(c) and the like, in a case of the present embodiment, an uneven shape 126 is formed in at least a portion of an outer peripheral surface of the grip portion 120. According to this configuration, the uneven shape 126 can be used as a slip stopper. Therefore, an operator can satisfactorily grip the grip portion 120. Fig. 18(b) is a plan view when viewed in a direction of an arrow A shown in Fig. 18(a), and Fig. 18(c) is a back view when viewed in a direction of an arrow B shown in Fig. 18(a).

[0117] In addition, a portion of an outer peripheral surface of the grip portion 120 forms a flat surface portion 125. A normal direction of the flat surface portion 125 is the same direction as a direction perpendicular to the alignment direction of the pair of elastic pieces 140. According to this configuration, an orientation of the opening 2a can be easily recognized by using a surface orientation (normal direction) of the flat surface portion 125 as an index. In particular, in the grip portion 120, a configuration in which the flat surface portion 125 and the other portion have different tactile sensations can be adopted. Therefore, an operator can recognize the orientation of the opening 2a, based on a difference in the tactile sensations.

[0118] The flat surface portion 125 is formed to be flat except for a region where a plurality of projections 126a (to be described later) are formed. The flat surface portion 125 is formed in an intermediate portion of the grip portion 120 in the axial direction. The flat surface portion 125 extends along the axial direction. In addition, in a case of the present embodiment, the distal end portion 125a of the flat surface portion 125 is slightly displaced outward in the radial direction toward the distal side. According to this configuration, when a thumb is disposed on the flat surface portion 125, a tip of the thumb can be satisfactorily fitted to the distal end portion 125a. In a case of the present embodiment, the normal direction of the flat surface portion 125 is the normal direction of a portion excluding the region where the distal end portion 125a and the plurality of projections 126a are formed in the flat surface portion 125. The normal direction of the flat surface portion 125 is a direction (for example, an up-down direction in Figs. 8 and 13) perpendicular to the radial direction and the alignment direction of the pair of elastic pieces 140. As shown in Fig. 8, in a state where the inner shaft 130 is located at the second position, the normal direction of a virtual plane 305 including the opening 2a in an open state is the same as the normal direction of the flat surface portion 125. In Fig. 8, the virtual plane 305 is shown by a two-dot chain line. In the following description, in the radial direction, a direction which is the same as the normal direction of the flat surface portion 125 may be referred to as a first direction (direction of an arrow B shown in Fig. 13), and the alignment direction of the pair of elastic pieces 140 may be referred to as a second direction (direction of an arrow C shown in Fig. 13). However, in the present invention, the alignment direction (second direction) of the pair of elastic pieces 140 is not limited to an example shown in Fig. 13, and may be any direction intersecting with at least the axial direction. Similarly, in the present invention, the normal direction (first direction) of the flat surface portion 125 is not limited to an example shown in Fig. 13, and may be any direction perpendicular to the alignment direction of at least the pair of elastic pieces 140.

[0119] In a case of the present embodiment, as shown in Figs. 18(a) to 18(c) and the like, the uneven shape 126 includes a plurality of projections 126a formed in the flat surface portion 125, and one or a plurality of (in the present embodiment, four) ribs 126b formed in at least a portion of portions other than the flat surface portion 125 in the grip portion 120 and extending in a direction intersecting with the axial direction. According to this configuration, for example, an operator can satisfactorily grip the whole grip portion 120 by placing the thumb along the flat surface portion 125 and placing the other fingers along the portions other than the flat surface portion 125 in the grip portion 120. More specifically, the displacement of the flat surface portion 125 in the circumferential direction with respect to a palm of the operator (turning around the axis) can be suppressed by the plurality of projections 126a formed in the flat surface portion 125. In addition, the displacement of the grip portion 120 in the axial direction with respect to the palm of the operator (leaving from the palm) can be suppressed by one or the plurality of ribs 126b extending in a direction intersecting with the axial direction. In the present invention, the uneven shape 126 may not include both the plurality of projections 126a and one or the plurality of ribs 126b, and for example, the uneven shape 126 may include at least one of the plurality of projections 126a or one or the plurality of ribs 126b.

[0120] Each of the plurality of projections 126a protrudes from the flat surface portion 125 (outer peripheral surface of the grip portion 120) to one side in the normal direction of the flat surface portion 125. Each of the plurality of projections 126a has a substantially columnar shape. A tip surface (tip in a protruding direction of the projection 126a) of each of the plurality of projections 126a is formed to be flat. An intermediate point of each of the plurality of ribs 126b (intermediate point in the extending direction of the rib 126b) is located on a side opposite to the flat surface portion 125 by 180 degrees in the radial direction. Each of the plurality of ribs 126b extends in an angular range of 180 degrees or larger in the circumferential direction. The plurality of ribs 126b each are disposed at an equal interval in the axial direction. However, the present invention is not limited to this example, and the uneven shape 126 may be any one of the plurality of projections 126a or one or the plurality of ribs 126b. In addition, in the present invention, the shape of the uneven shape 126 is not limited to this example, and for example, the uneven shape 126 may include one or a plurality of recess portion, or may include one or a plurality of groove portions extending in a direction intersecting with the axial direction. In addition, the number of the uneven shapes 126 of the grip portion 120 is not limited to the above-described example, and for example, may further include uneven shapes other than the plurality of projections 126a and the plurality of ribs 126b. In addition, the shape of each of the plurality of projections 126a is not limited to this example, and for example, may be a polygonal columnar shape, or may be a conical shape (or a polygonal pyramid shape) which gradually decreases in diameter toward the tip side. In addition, the number of the plurality of projections 126a included in the uneven shape 126 is not limited to the above-described example, and can be appropriately set. Similarly, the shape of the rib 126b is not limited to this example, and for example, may spirally extend while an axis of the grip portion 120 is set as a central axis. In addition, the number of the ribs 126b included in the uneven shape 126 is not limited to the above-described example, and can be appropriately set.

[0121] For example, the inner shaft 130 is formed in a substantially rod-like shape elongated in one direction. In addition, as shown in Figs. 13 and 14, for example, a second grip portion 150 having a larger diameter than the outer diameter of the inner shaft 130 is provided in the proximal end portion of the inner shaft 130. In Fig. 13, the second grip portion 150 is shown by a two-dot chain line for convenience. For example, the inner shaft 130 is formed of a resin material such as an ABS resin. However, the present invention is not limited to this example, and the inner shaft 130 may be formed of a metal material. In addition, for example, the second grip portion 150 is formed 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 larger and 13 mm or smaller. In addition, the total length of the inner shaft 130 is not particularly limited, but is preferably 270 mm or larger and 470 mm or smaller.

[0122] As shown in Fig. 8 and the like, in a case of the present embodiment, the normal direction of the proximal end side surface 152 of the second grip portion 150 is the same direction as the axial direction. According to this configuration, an operator can smoothly move the inner shaft 130 forward to the storage tube 110 by pressing the proximal end side surface 152 of the second grip portion 150 with a pad of a finger or a palm.

[0123] As shown in Fig. 14 and the like, the second grip portion 150 is formed in a substantially disc shape having a larger diameter than the outer diameter (maximum dimension in the radial direction) of the inner shaft 130. The outer diameter of the second grip portion 150 gradually decreases toward the distal side. Each of the proximal end side surface 152 and the distal end side surface 154 of the second grip portion 150 is formed to be flat, and the normal direction thereof is the same as the axial direction. However, in the present invention, the shape of the proximal end side surface 152 is not limited to this example, and for example, may be a recessed curve recessed toward the distal side. In addition, for example, an uneven shape for stopping slip may be formed on the proximal end side surface 152.

[0124] As shown in Figs. 16(a), 16(b), and the like, a holding portion 135 that removably holds the loop portion 4a is provided in the proximal end portion of the inner shaft 130. As shown in Fig. 12 and the like, in a state where the inner shaft 130 is located at the first position, the holding portion 135 is exposed from the storage tube 110.

[0125] According to this configuration, the string body 4 and the bag body 42 can be removably connected to the inner shaft 130 via the holding portion 135. In addition, after the specimen is stored in the bag body 42, the loop portion 4a is removed from the holding portion 135 by further moving the inner shaft 130 rearward from the second position to the first position again. In this manner, the bag body 42 and the inner shaft 130 can be easily disconnected at a desired timing.

[0126] For example, the holding portion 135 includes a pair of clamping portions 136 disposed to face each other in the circumferential direction and clamping a portion of the lead-out portion 4b, and a protruding portion 137 disposed on the proximal side with respect to the pair of clamping portions 136 and protruding outward in the radial direction. In a facing direction of the pair of clamping portions 136, a dimension (W1 shown in Fig. 16(a)) of the protruding portion 137 is larger than a separation distance (D1 shown in Fig. 16(a)) between the pair of clamping portions 136. The dimension W1 of the protruding portion 137 described herein is a minimum dimension of the protruding portion 137 in the facing direction of the pair of clamping portions 136. A portion of the lead-out portion 4b passes through a gap between the pair of clamping portions 136 from the distal side toward the proximal side, is hooked on the protruding portion 137, thereafter, passes again through the gap between the pair of clamping portions 136 from the proximal side toward the distal side, and forms the loop portion 4a. In the following description, in the lead-out portion 4b, a portion on one end side (one end of the lead-out portion 4b in the extending direction) with reference to the protruding portion 137 may be referred to as a first lead-out portion 4ba, and a portion on the other end side (other end of the lead-out portion 4b in the extending direction) may be referred to as a 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 a direction in which the first lead-out portion 4ba and the second lead-out portion 4bb are gradually separated 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 a direction in which the first lead-out portion 4ba and the second lead-out portion 4bb are gradually closer to 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 to be in a tensioned state (tension is applied) between the pair of clamping portions 136 and the protruding portion 137. In this manner, it is possible to suppress a possibility that the loop portion 4a is disengaged from the holding portion 135 at an unintended timing. In addition, when the loop portion 4a is removed from the holding portion 135, an operator can easily pinch the lead-out portion 4b. In the present invention, the configuration of the holding portion 135 is not limited to this example, and for example, the holding portion 135 may selectively include any one of the pair of clamping portions 136 and the protruding portion 137.

[0128] Furthermore, as shown in Figs. 16(a), 16(b), and the like, the holding portion 135 includes a pressing portion 138 disposed on the proximal side with respect to the protruding portion 137 and pressing a proximal end 4aa of the loop portion 4a inward in the radial direction. According to this configuration, it is possible to more reliably suppress the possibility that the loop portion 4a is disengaged from the holding portion 135 at an unintended timing. In addition, the lead-out portion 4b can be satisfactorily brought into a tensioned state (tension can be sufficiently applied) between the pair of clamping portions 136 and the protruding portion 137.

[0129] In addition, as shown in Figs. 14 and 15, in the inner shaft 130, a rearward movement restricting portion 139 that restricts a rearward movement of the inner shaft 130 to the proximal side with respect to the first position is provided on the distal side with respect to the holding portion. According to this configuration, it is possible to suppress a possibility that the inner shaft 130 unintentionally falls off from the storage tube 110.

[0130] In a case of the present embodiment, a state where the rearward movement restricting portion 139 is in contact with the proximal end portion 121a of the grip portion 120 (refer to Fig. 12 and the like) represents the first position, and is an initial state of the specimen retrieval device 100. The rearward movement restricting portion 139 comes into contact with the proximal end portion 121a of the grip portion 120, thereby restricting a further rearward movement of the inner shaft 130 with respect to the storage tube 110. In addition, in a case of the present embodiment, a state where the second grip portion 150 is in contact with the proximal end portion 121a of the grip portion 120 (refer to Fig. 11 and the like) represents the second position. The distal side surface 154 of the second grip portion 150 comes into contact with the proximal side surface of the grip portion 120, thereby restricting a further forward movement of the inner shaft 130 with respect to the storage tube 110.

[0131] Here, as shown in Fig. 13, the proximal side opening 122 of the grip portion 120 includes a first extending portion 122a extending in the radial direction, and a second extending portion 122b extending in a direction intersecting with the first extending portion 122a. In addition, at least a proximal end portion of the inner shaft 130 includes a first portion 130a extending in the same direction as the extending direction of the first extending portion 122a, and a second portion 130b extending in the same direction as the extending direction of the second extending portion 122b. When the inner shaft 130 slides in the axial direction with respect to the storage tube 110, the first portion 130a of the inner shaft 130 passes through the first extending portion 122a of the proximal side opening 122, and the second portion 130b of the inner shaft 130 passes through the second extending portion 122b of the proximal side opening 122. More specifically, when the inner shaft 130 slides in the axial direction with respect to the storage tube 110, the first portion 130a of the inner shaft 130 does not pass through the second extending portion 122b, and the second portion 130b of the inner shaft 130 does not pass through the first extending portion 122a.

[0132] According to this configuration, when the inner shaft 130 slides in the axial direction with respect to the storage tube 110, it is possible to suppress a possibility that the inner shaft 130 rotates around the axis with respect to the storage tube 110. Therefore, a state where the normal direction of the flat surface portion 125 is the same direction as the direction perpendicular to the alignment direction of the pair of elastic pieces 140 as described above can be satisfactorily maintained.

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

[0134] As shown in Figs. 15, 16(a), 16(b), and the like, for example, the inner shaft 130 includes a main portion 131 formed in a plate shape elongated in the axial direction, a pair of first erected portions 131a erected outward in the radial direction from one side plate surface of the main portion 131, and a pair of second erected portions 131b erected toward a side opposite to the first erected portions 131a from the other side plate surface of the main portion 131. In a case of the present embodiment, the first erected portion 131a and the second erected portion 131b form the first portion 130a passing through the first extending portion 122a of the proximal side opening 122. In addition, in the main portion 131, an outer portion in the radial direction with respect to the first erected portion 131a and the second erected portion 131b form the second portion 130b passing through the second extending portion 122b of the proximal side opening 122. In a case of the present embodiment, the normal direction of the plate surface of the main portion 131 is the same direction as the first direction. Each erected direction (extending direction of the first portion 130a) of the first erected portion 131a and the second erected portion 131b is the same direction as the first direction. Each of the pair of first erected portions 131a (however, a region where the holding portion 135 is formed is excluded (details will be described later)) linearly extends from the distal side to the proximal side on one side plate surface of the main portion 131. In the second direction, the pair of first erected portions 131a are separated from each other and face each other. Similarly, each of the pair of second erected portions 131b linearly extends from the distal side to the proximal side on the other side plate surface of the main portion 131. In the second direction, the pair of second erected portions 131b are separated from each other and face each other.

[0135] As shown in Figs. 16(a), 16(b), and the like, for example, the holding portion 135 is formed in an intermediate portion of the proximal end portion of the pair of first erected portions 131a on one side surface of the main portion 131. More specifically, each of the pair of first erected portions 131a is interrupted in the region where the holding portion 135 is formed, and includes a distal side portion 131aa and a proximal side portion 131ab with reference to the holding portion 135. In the axial direction, the distal side portion 131aa, the holding portion 135, and the proximal side portion 131ab are disposed in this order from the distal side. The lead-out portion 4b is guided to the holding portion 135 after passing through a gap between the distal side portions 131aa of the pair of first erected portions 131a.

[0136] In a case of the present embodiment, one clamping portion 136 of the pair of clamping portions 136 is formed in the proximal end of one distal side portions 131aa of the pair of first erected portions 131a, and the other clamping portion 136 is formed in the proximal end of the other distal side portion 131aa. In a case of the present embodiment, the facing direction of the pair of clamping portions 136 is the second direction. However, the present invention is not limited to this example, and the facing direction of the pair of clamping portions 136 may be any direction intersecting with at least the axial direction. For example, one of the clamping portions 136 protrudes from an inner surface of the corresponding first erected portion 131a toward the other clamping portion 136 side. One of the clamping portions 136 is formed in a claw shape gradually narrowed toward the other clamping portion 136 side. In a case of the present embodiment, the separation distance D1 between the pair of clamping portions 136 is a separation distance between tip surfaces (tips in the protruding direction of the clamping portions 136) of the pair of clamping portions 136 in the facing direction. In a case of the present embodiment, the separation distance D1 between the pair of clamping portions 136 is set to a dimension equal to or slightly smaller than a wire diameter of the string body 4. The first lead-out portion 4ba and the second lead-out portion 4bb are each clamped by the pair of clamping portions 136.

[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 to be in a tensioned state (tension is applied) between the pair of clamping portions 136 and the protruding portion 137. In an example shown in Fig. 16(a), in a plan view (when viewed in a direction perpendicular to the facing 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 to each other.

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

[0139] According to this configuration, as shown in Fig. 16(b), the loop portion 4a can be lifted outward in the radial direction from the one side surface of the main portion 131. Therefore, the operator can more easily pinch the loop portion 4a. When viewed in the protruding direction of the protruding portion 137 (refer to Fig. 16(a)), the first protruding portion 137a has an elongated substantially elliptical shape in the facing direction of the pair of clamping portions 136, and the second protruding portion 137b has a substantially circular shape. When viewed in the protruding direction of the protruding portion 137, the second protruding portion 137b is disposed in an intermediate portion of the second protruding portion 137b in the longitudinal direction.

[0140] For example, the pressing portion 138 linearly protrudes toward the distal side from the distal end of a proximal side portion 131ab of the pair of first erected portions 131a. The tip surface 138a (tip in the protruding direction of the pressing portion 138) of the pressing portion 138 is formed to be flat, and the normal direction thereof is the same direction as the axial direction. In addition, the inner surface 138b of the pressing portion 138 is formed to be flat, and the normal direction thereof is the same direction as the protruding direction of the protruding portion 137. In a case of the present embodiment, the separation distance between the proximal end of the protruding portion 137 and the tip surface 138a of the pressing portion 138 in the axial direction is slightly smaller than the wire diameter of the string body 4. In this manner, the proximal end 4aa of the loop portion 4a can be clamped between the protruding portion 137 and the tip surface 138a of the pressing portion 138. Furthermore, in the protruding direction of the protruding portion 137, 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 this manner, a portion of the proximal end 4aa of the loop portion 4a can be pushed inward in the radial direction with respect to the tip surface 137aa of the first protruding portion 137a by the inner surface 138b of the pressing portion 138.

[0141] According to this configuration, it is possible to suppress a possibility that the loop portion 4a is disengaged from the protruding portion 137 at an unintended timing. In addition, in the protruding direction of the protruding portion 137, the inner surface 138b of the pressing portion 138 may be located inward (on the central axis side of the inner shaft 130) of the tip surface 137aa of the first protruding portion 137a. In this manner, a portion of the proximal end 4aa of the loop portion 4a can be pushed inward in the radial direction by the inner surface 138b of the pressing portion 138.

[0142] As shown in Figs. 14 and 15, in a case of the present embodiment, the rearward movement restricting portions 139 are disposed at a plurality of locations in the circumferential direction. More specifically, the rearward movement restricting portions 139 are each intermittently formed in a portion between one first erected portion 131a and the main portion 131, a portion between the other first erected portion 131a and the main portion 131, a portion between one second erected portion 131b and the main portion 131, and a portion between the other second erected portion 131b and the main portion 131, in the circumferential direction.

[0143] As shown in Fig. 15, the plurality of rearward movement restricting portions 139 are each formed in a substantially fan shape when viewed in the axial direction. Plate surfaces of the plurality of rearward movement restricting portions 139 are each disposed to face the axial direction. As shown in Fig. 13, when viewed from the proximal side, the plurality of rearward movement restricting portions 139 each overlap a region where the proximal side opening 122 is not formed in the proximal end portion 121a of the grip portion 120. According to this configuration, the plurality of rearward movement restricting portions 139 each come into contact with the region where the proximal side opening 122 is not formed into the proximal end portion 121a, thereby restricting the further rearward movement of the inner shaft 130. However, in the present invention, the shape of the rearward regulation portion 139 is not limited to this example, and the rearward regulation portion 139 may extend in a turning shape of 360 degrees in the circumferential direction, for example.

[0144] In addition, in the main portion 131, an opening portion 138c that penetrates the main portion 131 in the thickness direction is formed in a portion between the protruding portion 137 and the proximal side portion 131ab. In this manner, when the loop portion 4a is removed from the second protruding portion 137b or when the loop portion 4a is hooked on the second protruding portion 137b, the string body 4 can be handled from both sides in the radial direction. The opening portion 138c linearly extends over the proximal end of the protruding portion 137 and the distal end of the proximal side portion 131ab. In a plan view (when viewed in the thickness direction of the main portion 131), the pressing portion 138 and the formation region of the opening portion 138c overlap each other.

[0145] Furthermore, as shown in Figs. 16(a) and 16(b), the formation region of the holding portion 135 in the main portion 131 is a constricted portion 131c constricted toward the central axis (central axis of the inner shaft 130) side with respect to other portions. According to this configuration, for example, the operator can easily remove the loop portion 4a from the holding portion 135 by pinching the loop portion 4a with one hand and holding the constricted portion 131c with the other hand.

[0146] Here, in a state where the inner shaft 130 is located at the first position (that is, a state where the bag body 42 is stored in the storage tube 110), as shown in Fig. 19(a), the bag body 42 is folded while a virtual straight line different from the straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis in the storage tube 110. Here, as a comparative example, Fig. 19(b) shows a state where the bag body 42 is folded while a straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis. In addition, Figs. 19(a) and 19(b) selectively show a folded portion (in a case of the present embodiment, the storage portion 42b) of the bag body 42. In addition, Fig. 19(a) and Fig. 19(b) schematically show the storage tube 110, the pair of elastic pieces 140, and the storage portion 42b in a cross section along a direction intersecting with the axial direction. In addition, in an example shown in Fig. 19(a), the intermediate point 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 intermediate point between the pair of elastic pieces 140 may be disposed at a position offset from the center of the storage tube 110 in the radial direction. A central axis 301 described herein means a winding axis when the bag body 42 is wound multiple times, and means a width center of a folded overlapping portion, rather than crease, when the bag body 42 is folded once or multiple times.

[0147] According to this configuration, the bag body 42 can be more compactly folded than when the bag body 42 is folded while the straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis (refer to Fig. 19(b)). In addition, since the bag body 42 is folded while the virtual straight line different from the straight line passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis 301, when the pair of elastic pieces 140 is exposed from the storage tube 110, the bag body 42 can be quickly switched from a folded state to an unfolded state (refer to Fig. 8). As shown in Fig. 19(a), in a case of the present embodiment, in the radial direction, the central axis 301 is disposed at a position different from the straight line 302 passing through the intermediate point between the pair of elastic pieces 140. In an example shown in Fig. 19(a), the central axis 301 is disposed parallel to the straight 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 straight line 302.

[0148] More specifically, in a state where the inner shaft 130 is located at the first position, the bag body 42 is folded inside the storage tube 110 in a state of being wound around the central axis 301 as the winding axis. According to this configuration, the bag body 42 can be more compactly folded than when the bag body 42 is folded while the straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis. In addition, when the pair of elastic pieces 140 is exposed from the storage tube 110, the bag body 42 can be quickly switched from the wound state to the unfolded state.

[0149] In addition, as shown in Fig. 19(a), in the radial direction, the central axis 301 is disposed outside in the alignment direction the pair of elastic pieces 140. According to this configuration, a winding outer diameter of the bag body 42 can be further reduced as large as the width dimension and the thickness dimension of the pair of elastic pieces 140, compared to when the bag body 42 is folded while the straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis (refer to Fig. 19(b)). In addition, since it is not necessary to wind the bag body 42 against the elastic restoring force of the pair of elastic pieces 140, the bag body 42 can be more tightly wound. Therefore, a winding thickness of the bag body 42 can be further reduced.

[0150] The “winding outer diameter and the winding thickness of the bag body 42” described herein are winding outer diameters (maximum outer diameters) R4 and R5 and winding thicknesses T1 and T2 (refer to Figs. 19(a) and 19(b)) of a portion (storage portion 42b) excluding the pair of string insertion portions 2ra in the bag body 42. As shown in Fig. 19(a), in a case of the present embodiment, the central axis 301 is disposed outside in the radial direction with respect to the straight line 302 passing through the intermediate point between the pair of elastic pieces 140. As shown in Fig. 19(b), when the bag body 42 is folded while the straight line 302 passing through the intermediate point between the pair of elastic pieces 140 is set as the central axis, the winding outer diameter R5 of the storage portion 42b is larger than the width dimension of the elastic piece 140. On the other hand, as shown in Fig. 19(a), in a case of the present embodiment, in the radial direction, the central axis 301 is disposed outside in the alignment direction of the pair of elastic pieces 140. Therefore, for example, the winding outer diameter R4 of the storage portion 42b can be the same as the width dimension of the elastic piece 140 or can be smaller than the width dimension of the elastic piece 140. However, for example, the winding outer diameter R4 of the storage portion 42b may be larger than the width dimension of the elastic piece 140. In addition, when the bag body 42 is folded while the straight line 302 passing through an intermediate point between the pair of elastic pieces 140 is set as the central axis, it is necessary to wind the bag body 42 against the elastic restoring force of the pair of elastic pieces 140. Therefore, as shown in Figs. 19(a) and 19(b), the winding thickness T2 of the storage portion 42b in a comparative example is larger than the winding thickness T1 of the storage portion 42b in the present embodiment. For example, the winding thickness T1 of the storage portion 42b is preferably 2 / 3 or smaller and more preferably 1 / 2 or smaller of the width dimension of the elastic piece 140. Furthermore, in a case of the present embodiment, compared to when the bag body 42 is folded while the straight line 302 passing through an intermediate point between the pair of elastic pieces 140 is set as the central axis, the winding outer diameter R4 and the winding thickness T1 of the storage portion 42b can be further reduced. Therefore, the peripheral length of the storage portion 42b (peripheral length in a cross section perpendicular to the central axis 301) can be further reduced (for example, reduced to 1 / 2 or smaller of the peripheral length of the storage portion 42b in the comparative example).

[0151] According to this configuration, for example, it is possible to suppress a possibility that the storage portion 42b and the inner peripheral surface of the storage tube 110 interfere with each other inside the storage tube 110.

[0152] Hereinafter, an example of a state where the bag body 42 is folded in the present embodiment will be described. As shown in Fig. 19(a), in the bag body 42, the storage portion 42b is wound around the virtual straight line extending parallel to the edge of the opening 2a as the central axis 301. Specifically, the storage portion 42b may be folded multiple times along a folding line (not shown) intersecting with the central line C of the storage portion 42b. In addition, in a folded state, the whole storage portion 42b may be stored inside the opening 2a in the width direction in a plan view (when viewed in the normal direction of a front surface or a rear surface of the bag body 42). As described above, the storage portion 42b may be folded along a plurality of folding lines intersecting with the central line C of the storage portion 42b, and the bent storage portion 42b may be wound around the central axis 301 as the winding axis. In this configuration, the central axis 301 is the winding axis of the storage portion 42b, and also forms a width center of the folded overlapping portion in the storage portion 42b.

[0153] According to this configuration, even when the bag body 42 is obliquely inclined downward from the opening 2a to the tip portion (back end portion 2c) on the side opposite to the opening 2a, the bag body 42 can be compactly folded. However, in the present invention, the number of folding times of the bag body 42 (number of folding lines) is not particularly limited, and can be appropriately set depending on the shape and the dimension of the bag body 42. In addition, in the present invention, the bag body 42 may be only folded along the folding line, or may not be wound around the central axis 301 as the winding axis. Similarly, in the present invention, the bag body 42 is only wound around the central axis 301 as the winding axis, and may not be folded along the folding line. In addition, in the present invention, a state where the bag body 42 is folded is not limited to this example.

[0154] In addition, in a case of the present embodiment, an antiblocking agent is applied to at least a portion of the surface of the bag body 42. According to this configuration, it is possible to suppress a possibility that the surfaces of the folded bag body 42 stick to each other. When the bag body 42 is extruded from the storage tube 110, the bag body 42 can be quickly brought into an unfolded state (refer to Fig. 8 and the like) from a folded state. The antiblocking agent may be applied to an entire surface of the bag body 42, or may be locally applied to a portion of the surface.

[0155] In addition, the antiblocking agent may also be applied to the inner peripheral surface of the storage tube 110. According to this configuration, the bag body 42 can smoothly slide inside the storage tube 110 together with the pair of elastic pieces 140.

[0156] The blocking refers to a phenomenon in which rubbers, resin films, or sheet materials adhere to each other and are not easily separated while being overlapped and brought into contact with each other for a long time. The antiblocking agent is not particularly limited as long as the antiblocking agent has an action of preventing the blocking, and as an example, a silicone oil may be used as the antiblocking agent. For example, viscosity of the silicone oil is preferably 20.0 cP (centipoise) or higher and 150 cP or lower, and more preferably 60.0 cP or higher and 110 cP or lower.

[0157] Hereinafter, an example of a method of using the specimen retrieval device 100 of the present embodiment will be described. In the surgical treatment (for example, thoracoscopic surgery) using the specimen retrieval device 100, the specimen retrieval device 100 is inserted into the body cavity via the incision wound 30a formed in the body cavity. The specimen (excision piece 10) is stored in the storage portion 42b, and is retrieved out of the body.

[0158] First, as shown in Fig. 20, the distal end portion (distal end portion of the storage tube 110) of the specimen retrieval device 100 in an initial state is inserted into the body cavity (thoracic cavity) via the incision wound 30a.

[0159] Next, as shown in Fig. 21, the inner shaft 130 is moved forward from the first position to the second position. More specifically, first, while the grip portion 120 is gripped with one hand, the second grip portion 150 is moved forward to the storage tube 110 side together with the inner shaft 130 with another hand. In this manner, the distal end portion of the inner shaft 130 and the pair of elastic pieces 140 are exposed from the storage tube 110. Subsequently, when the inner shaft 130 is moved forward to the second position, the pair of elastic pieces 140 are released from the constraint of the storage tube 110, and are elastically restored to a natural state from a closed state. In this manner, the opening 2a can be brought into an open state inside the body cavity by elastically opening the opening 2a.

[0160] Subsequently, when the excision piece 10 is stored in the storage portion 42b, the bag body 42 and the specimen retrieval device 100 are disconnected. More specifically, as shown in Fig. 22, the inner shaft 130 is moved rearward again from the second position to the first position. In this manner, the holding portion 135 and the loop portion 4a are exposed from the storage tube 110. In addition, while the pair of elastic pieces 140 are pulled out from the corresponding string insertion portion 2ra to the proximal side, the pair of elastic pieces 140 are stored again inside the storage tube 110. In this state, since the loop portion 4a is removed from the protruding portion 137, the bag body 42 and the inner shaft 130 can be disconnected.

[0161] As shown in Fig. 23, when the bag body 42 and the inner shaft 130 are disconnected, the storage tube 110 and the inner shaft 130 are retrieved from the body cavity while leaving the bag body 42 and the string body 4 inside the body cavity.

[0162] Next, as shown in Fig. 24, the fastener 50 is slid in a direction closer to the opening 2a with respect to the string body 4, and the opening 2a is brought into a closed state. An operation on the fastener 50 may be performed outside the body cavity by the hand of the operator, or may be performed inside the body cavity by using a forceps or the like. Subsequently, the excision piece 10 is retrieved out of the body together with the bag body 42 via the incision wound 30a. In this way, the specimen (excision piece 10) can be stored in the storage portion 42b and retrieved out of the body by using the specimen retrieval device 100.

[0163] Each of various components of the specimen retrieval bag (1, 1A, 1B, and 1C) according to the present invention does not need to be independently present. The present invention allows that a plurality of components are formed as one member, that one component is formed to include a plurality of members, that a certain component is a portion of another component, that a portion of a certain component and a portion of another component overlap each other, and the like. Similarly, each of various components of the specimen retrieval device 100 according to the present invention does not need to be independently present. The present invention allows that a plurality of components are formed as one member, that one component is formed to include a plurality of members, that a certain component is a portion of another component, that a portion of a certain component and a portion of another component overlap each other, and the like.

[0164] Hitherto, each embodiment and modification example have been described with reference to the drawings. Meanwhile, these are examples of the present invention, and various configurations other than those described above can also be adopted.

[0165] The present embodiment includes the following technical ideas. (1) A specimen retrieval bag includes a bag body including a storage portion for storing a specimen through an opening. The bag body is obliquely inclined downward from the opening to a tip portion located on a side opposite to the opening. (2) In the specimen retrieval bag according to (1), the storage portion has a bent portion smoothly bent between the tip portion and the opening. (3) In the specimen retrieval bag according to (1) or (2), in the storage portion, a portion to the tip portion is continuously inclined downward, and a portion parallel to the opening is not formed. (4) In the specimen retrieval bag according to any one of (1) to (3), in the bag body, a length in a direction parallel to one direction on a virtual plane including the opening is longer than a length in a direction perpendicular to the opening. (5) In the specimen retrieval bag according to any one of (1) to (4), the specimen is an intrathoracic organ, and the bag body is used for storing the intrathoracic organ. (6) In the specimen retrieval bag according to (5), the intrathoracic organ is a lung, and the bag body is used for storing the lung. (7) In the specimen retrieval bag according to any one of (1) to (6), a volume of the storage portion is 500 mL or more and 1,000 mL or less. (8) In the specimen retrieval bag according to any one of (1) to (7), the tip portion of the bag body is formed in a partial sphere shape having a diameter of 50 mm or larger and 100 mm or smaller. (9) In the specimen retrieval bag according to any one of (1) to (8), an opening area of the opening is 60 cm2or larger and 120 cm2or smaller. (10) In the specimen retrieval bag according to any one of (1) to (9), the bag body includes an inner edge close to a bending center side on an inner surface of the bag body, and an outer edge separated from the bending center side. The inner edge is provided with at least one discontinuous point where a curvature is discontinuous. In the storage portion, an area of a cross section parallel to the opening and including a point located closest to an opening side in the discontinuous points is 40 cm2or larger and 80 cm2or smaller. (11) In the specimen retrieval bag according to (10), the area of the cross section parallel to the opening is equal to or more than 1.3 times and equal to or smaller than 4 times an area of a cross section perpendicular to a central line of the storage portion and including the point located closest to the opening side in the discontinuous points, in the storage portion. (12) In the specimen retrieval bag according to any one of (1) to (7), the bag body includes an inner edge close to a bending center side on an inner surface of the bag body, and an outer edge separated from the bending center side. A peripheral length of the inner surface of the bag body which intersects with a cross section perpendicular to a central line of the storage portion decreases from the opening to the tip portion located on the side opposite to the opening. (13) In the specimen retrieval bag according to (12), a peripheral length of the opening is 160 mm or larger and 400 mm or smaller. (14) In the specimen retrieval bag according to (13), with respect to a length of the central line from the opening to the tip portion, at any position between 20% to 40% from the opening, the peripheral length of the inner surface of the bag body which intersects with the cross section perpendicular to the central line is a length of 60% to 80% of a peripheral length of the opening. (15) In the specimen retrieval bag according to any one of (1) to (14), an inner surface of the bag body is subjected to water-repellent coating. (16) The specimen retrieval bag according to any one of (1) to (15) further includes a handheld portion gripped by a user. The handheld portion is pulled out to one side with respect to the bag body. The tip portion provided in the bag body is disposed on the one side with respect to the opening. (17) In the specimen retrieval bag according to any one of (1) to (16), the bag body is provided with a lumen extending from a back end portion of the storage portion to a base end portion on a side of the opening, and causing a gas inside the storage portion to pass through the opening. (18) In the specimen retrieval bag according to (17), a plurality of the lumens are provided to face each other across a center of the storage portion. (19) In the specimen retrieval bag according to (18), which cites (2), the bent portion is bent in an in-plane direction connecting two of the lumens which face each other across the center of the storage portion. (20) In the specimen retrieval bag according to any one of (17) to (19), the bag body has a flare portion in a vicinity of the opening, the flare portion being widened from a back side of the storage portion toward the side of the opening. A base end portion of the lumen extends along the flare portion. (21) In the specimen retrieval bag according to any one of (17) to (20), the bag body is made of a resin film. The lumen is formed by performing heat sealing on the bag body in a line shape. (22) The specimen retrieval bag according to any one of (1) to (21) further includes a string body provided in an edge of the opening. A shape of the string body is memorized so that the opening is in an open state. (23) In the specimen retrieval bag according to any one of (1) to (22), the bag body is provided with a discharge opening through which the storage portion and an outside communicate with each other, in a back end portion on the side opposite to the opening. The discharge opening is blocked by a filter through which a gas passes and a liquid does not pass. (24) A specimen retrieval device includes the specimen retrieval bag according to any one of (1) to (23). The specimen retrieval device is configured to place the opening of the bag body in an open state and to place the opening which is in the open state into a closed state. (25) The specimen retrieval device according to (24), further includes an extrusion operation unit having a storage tube, a grip portion fixed to a proximal end portion of the storage tube, and an inner shaft inserted into the storage tube to be slidably in an axial direction. The inner shaft is movable forward in the axial direction, from a first position where the bag body is stored inside the storage tube to a second position where the bag body is extruded from the storage tube. (26) The specimen retrieval device according to (24) or (25) further includes an opening operation unit having a storage tube, a grip portion fixed to a proximal end portion of the storage tube, an inner shaft inserted into the storage tube to be slidable in an axial direction, and a pair of elastic pieces whose distal end side is in an open state in a natural state. The pair of elastic pieces are fixed to a distal end portion of the inner shaft, and hold a vicinity of the opening. The inner shaft is movable forward in the axial direction, from a first position where the pair of elastic pieces are stored inside the storage tube to a second position where the pair of elastic pieces are brought into the natural state after being exposed from the storage tube. The opening is elastically opened to be in the open state by moving the inner shaft forward to the second position. (27) In the specimen retrieval device described in (26), the specimen retrieval bag includes a string body provided in an edge of the opening. The bag body includes a pair of string insertion portions formed on each of one side and the other side of the edge of the opening and into which the string body is inserted. The string body is configured to bring the opening into the closed state. One of the pair of elastic pieces is inserted into one string insertion portion of the pair of string insertion portions. The other of the pair of elastic pieces is inserted into the other string insertion portion of the pair of string insertion portions. (28) In the specimen retrieval device according to (27), the elastic piece is formed in a plate shape. The elastic piece includes an arc-shaped curved portion curved in an arc shape in a direction closer to the other elastic piece toward the distal end side, a distal side portion connected to the distal end side of the arc-shaped curved portion, and a most distal end portion connected to a distal side of the distal side portion. In the natural state, the most distal end portion of the elastic piece extends in a direction intersecting with a direction away from the most distal end portion of the other elastic piece toward the distal end side and with the axial direction. (29) In the specimen retrieval device according to any one of (26) to (28), a second grip portion formed to have a larger diameter than an outer diameter of the inner shaft is provided in a proximal end portion of the inner shaft. A normal direction of a proximal end side surface of the second grip portion is the same direction as the axial direction. (30) In the specimen retrieval device according to (27) or (28), a portion of the string body is a lead-out portion led out from the pair of string insertion portions. A portion of the lead-out portion is introduced into the storage tube, and forms a loop portion. A holding portion holding the loop portion to be removable is provided in a proximal end portion of the inner shaft. The holding portion is exposed from the storage tube in a state where the inner shaft is located at the first position. (31) In the specimen retrieval device according to (30), the holding portion includes a pair of clamping portions disposed to face each other in a circumferential direction and clamping a portion of the lead-out portion, and a protruding portion disposed on a proximal side with respect to the pair of clamping portions and protruding outward in a radial direction. In a facing direction of the pair of clamping portions, a width dimension of the protruding portion is larger than a separation distance between the pair of clamping portions. A portion of the lead-out portion passes through a gap between the pair of clamping portions from a distal side toward the proximal side, is hooked on the protruding portion, thereafter, passes again through the gap between the pair of clamping portions from the proximal side toward the distal side, and forms the loop portion. (31-1) In the specimen retrieval device according to (31), the holding portion includes a pressing portion disposed on the proximal side with respect to the protruding portion and pressing the proximal end of the loop portion inward in the radial direction. (31-2) In the specimen retrieval device according to (31-1), a separation distance between the protruding portion and a distal end surface of the pressing portion in the axial direction is smaller than a wire diameter of the string body. (31-3) In the specimen retrieval device according to (31), the protruding portion includes a first protruding portion and a second protruding portion protruding in the same direction as the first protruding portion from a tip surface of the first protruding portion. In a facing direction of the pair of clamping portions, a dimension of the first protruding portion is larger than a dimension of the second protruding portion. The loop portion of the string body is hooked on the second protruding portion. (32) In the specimen retrieval device according to any one of (26) to (31), in a state where the inner shaft is located at the first position, the bag body is folded inside the storage tube while a virtual straight line different from a straight line passing through an intermediate point between the pair of elastic pieces is set as a central axis. (33) In the specimen retrieval device according to (32), in a state where the inner shaft is located at the first position, the bag body is folded inside the storage tube in a state where the bag body is wound around the central axis serving as a winding axis. (34) In the specimen retrieval device according to (32) or (33), in a radial direction, the central axis is disposed outside in an alignment direction of the pair of elastic pieces. (35) In the specimen retrieval device according to (28), the specimen retrieval bag further includes a fastener formed in a tubular shape. One end portion of the string body led out from the one string insertion portion to a side of the inner shaft and the other end portion of the string body led out from the other string insertion portion to the side of the inner shaft are each inserted into the fastener to be slidable. (36) The specimen retrieval device according to (30) or (31), in the inner shaft, a rearward movement restricting portion that restricts a rearward movement of the inner shaft to a proximal side with respect to the first position is provided on a distal side with respect to the holding portion.

[0166] In addition, in the fifth embodiment, an example in which the specimen retrieval device includes the specimen retrieval bag has been described. However, the present invention is not limited to this example, and whether or not the specimen retrieval device includes the specimen retrieval bag may be determined by any configuration. That is, the present embodiment also includes the technical idea of <1> below. <1> There is provided an opening operation unit used to elastically open an opening of the specimen retrieval bag according to any one of (1) to (23). The opening operation unit includes a storage tube, a grip portion fixed to a proximal end portion of the storage tube; an inner shaft inserted into the storage tube to be slidable in an axial direction, and a pair of elastic pieces brought into a state where a distal end side is open in a natural state. The pair of elastic pieces are fixed to a distal end portion of the inner shaft and holds a vicinity of the opening. The inner shaft is movable forward from a first position at which the pair of elastic pieces are stored inside the storage tube to a second position at which the pair of elastic pieces are exposed from the storage tube to be in the natural state, in the axial direction. The opening operation unit is configured to elastically open the opening by moving the inner shaft forward to the second position.

[0167] In addition, the first to fifth embodiments described above also include the technical ideas of <2> or <3> below. <2> There is provided a specimen retrieval bag held by the pair of elastic pieces of the opening operation unit according to <1> and stored in the storage tube. In the specimen retrieval bag, the bag body is folded while a virtual straight line different from a straight line passing through an intermediate point between the pair of elastic pieces is set as a central axis, inside the storage tube. <3> There is provided a specimen retrieval bag held by the pair of elastic pieces of the opening operation unit according to <1> and stored in the storage tube. In the specimen retrieval bag, an antiblocking agent is applied to at least a portion of a surface of the bag body. In the first to fifth embodiments described above, an example in which the bag body of the specimen retrieval bag is obliquely inclined downward from the opening to the tip portion has been described. However, in the specimen retrieval bag according to <2> or <3>, whether or not the bag body is obliquely inclined downward from the opening to the tip portion may be determined by any configuration. That is, the bag body of the specimen retrieval bag according to <2> or <3> may linearly extend from the opening to the tip portion, for example, in a direction in which the specimen enters and exits.

[0168] This application claims priority based on Japanese Patent Application No. 2024-98054 filed June 18, 2024, and No. 2025-99561 filed June 13, 2025, the entire disclosures of which are incorporated herein by reference. Reference Signs List

[0169] 1, 1A, 1B, 1C: specimen retrieval bag 2: bag body 2a: opening 2b: storage portion 2c: back end portion (tip portion) 2d: base end portion 2f: flare portion 2g: sheet 2h, 2i: bent portion 2p: inner edge 2pa: base end portion 2pb: back end portion 2q: outer edge 2ra: pair of string insertion portions 2raa: opening of one end side 3: pushing mechanism 3a: expansion / contraction portion 3b: rubber ball (operation unit) 3c: tube 3d: check valve 4: string body (handheld portion) 4a: loop portion 4aa: proximal end 4b: lead-out portion 4ba: first lead-out portion 4bb: second lead-out portion 5: storage tube (handheld portion) 10: excision piece (specimen) 13: pushing mechanism 13a: expansion / contraction portion 14: filter 15: discharge opening 16: lumen 16a: base end portion 17: traction string 17a: ring 20: incision wound guard 24: string body (handheld portion) 30: body wall 30a: incision wound 42: bag body 42b: storage portion 50: fastener 100: specimen retrieval device 110: storage tube 120: grip portion 121a: proximal end portion 122: proximal side opening 122a: first extending portion 122b: second extending portion 125: flat surface portion 125a: distal end portion 126: uneven shape 126a: plurality of projections 126b: plurality of ribs 130: inner shaft 130a: first portion 130b: second portion 131: main portion 131a: pair of first erected portions 131aa: distal end side portion 131ab: proximal end side portion 131b: pair of second erected portions 131c: constricted portion 132: fixing member 134: insertion portion 135: holding portion 136: pair of clamping portions 137: protruding portion 137a: first protruding portion 137aa: tip surface 137b: second protruding portion 138: pressing portion 138a: tip surface 138b: inner surface 138c: opening portion 139: rearward movement restricting portion 140: pair of elastic pieces 142: arc-shaped curved portion 144: distal side portion 146: most distal end portion 150: second grip portion 152: proximal end side surface 154: distal end side surface 162: extrusion operation unit 164: opening operation unit 301: central axis (virtual straight line) 302: straight line passing through intermediate point between pair of elastic pieces 305: virtual plane A1, A2: cross section C: central line LA: upper inner edge LB: lower inner edge P1: discontinuous point

Claims

1. A specimen retrieval bag comprising: a bag body including a storage portion for storing a specimen through an opening, wherein the bag body is obliquely inclined downward from the opening to a tip portion located on a side opposite to the opening.

2. The specimen retrieval bag according to Claim 1, wherein the storage portion has a bent portion smoothly bent between the tip portion and the opening.

3. The specimen retrieval bag according to Claim 1 or 2, wherein in the storage portion, a portion to the tip portion is continuously inclined downward, and a portion parallel to the opening is not formed.

4. The specimen retrieval bag according to Claim 3, wherein in the bag body, a length in a direction parallel to one direction on a virtual plane including the opening is longer than a length in a direction perpendicular to the opening.

5. The specimen retrieval bag according to any one of Claims 1 to 4, wherein the specimen is an intrathoracic organ, and the bag body is used for storing the intrathoracic organ.

6. The specimen retrieval bag according to Claim 5, wherein the intrathoracic organ is a lung, and the bag body is used for storing the lung.

7. The specimen retrieval bag according to any one of Claims 1 to 6, wherein a volume of the storage portion is 500 mL or more and 1,000 mL or less.

8. The specimen retrieval bag according to any one of Claims 1 to 7, wherein the tip portion of the bag body is formed in a partial sphere shape having a diameter of 50 mm or larger and 100 mm or smaller.

9. The specimen retrieval bag according to any one of Claims 1 to 8, wherein an opening area of the opening is 60 cm2or larger and 120 cm2or smaller.

10. The specimen retrieval bag according to any one of Claims 1 to 9, wherein the bag body includes an inner edge close to a bending center side on an inner surface of the bag body, and an outer edge separated from the bending center side, the inner edge is provided with at least one discontinuous point where a curvature is discontinuous, and in the storage portion, an area of a cross section parallel to the opening and including a point located closest to an opening side in the discontinuous points is 40 cm2or larger and 80 cm2or smaller.

11. The specimen retrieval bag according to Claim 10, wherein the area of the cross section parallel to the opening is equal to or more than 1.3 times and equal to or smaller than 4 times an area of a cross section perpendicular to a central line of the storage portion and including the point located closest to the opening side in the discontinuous points, in the storage portion.

12. The specimen retrieval bag according to any one of Claims 1 to 11, wherein the bag body includes an inner edge close to a bending center side on an inner surface of the bag body, and an outer edge separated from the bending center side, and a peripheral length of the inner surface of the bag body which intersects with a cross section perpendicular to a central line of the storage portion decreases from the opening to the tip portion located on the side opposite to the opening.

13. The specimen retrieval bag according to Claim 12, wherein a peripheral length of the opening is 160 mm or larger and 400 mm or smaller.

14. The specimen retrieval bag according to Claim 12 or 13, wherein with respect to a length of the central line from the opening to the tip portion, at any position between 20% to 40% from the opening, the peripheral length of the inner surface of the bag body which intersects with the cross section perpendicular to the central line is a length of 60% to 80% of a peripheral length of the opening.

15. The specimen retrieval bag according to any one of Claims 1 to 14, wherein an inner surface of the bag body is subjected to water-repellent coating.

16. The specimen retrieval bag according to any one of Claims 1 to 15, further comprising: a handheld portion gripped by a user, wherein the handheld portion is pulled out to one side with respect to the bag body, and the tip portion provided in the bag body is disposed on the one side with respect to the opening.

17. The specimen retrieval bag according to any one of Claims 1 to 16, wherein the bag body is provided with a lumen extending from a back end portion of the storage portion to a base end portion on a side of the opening, and causing a gas inside the storage portion to pass through the opening.

18. The specimen retrieval bag according to Claim 17, wherein a plurality of the lumens are provided to face each other across a center of the storage portion.

19. The specimen retrieval bag according to Claim 18, which cites Claim 2, wherein the bent portion is bent in an in-plane direction connecting two of the lumens which face each other across the center of the storage portion.

20. The specimen retrieval bag according to any one of Claims 17 to 19, wherein the bag body has a flare portion in a vicinity of the opening, the flare portion being widened from a back side of the storage portion toward the side of the opening, and a base end portion of the lumen extends along the flare portion.

21. The specimen retrieval bag according to any one of Claims 17 to 20, wherein the bag body is made of a resin film, and the lumen is formed by performing heat sealing on the bag body in a line shape.

22. The specimen retrieval bag according to any one of Claims 1 to 21, further comprising: a string body provided in an edge of the opening, and wherein a shape of the string body is memorized so that the opening is in an open state.

23. The specimen retrieval bag according to any one of Claims 1 to 22, wherein the bag body is provided with a discharge opening through which the storage portion and an outside communicate with each other, in a back end portion on the side opposite to the opening, and the discharge opening is blocked by a filter through which a gas passes and a liquid does not pass.

24. A specimen retrieval device comprising: the specimen retrieval bag according to any one of Claims 1 to 23, wherein the specimen retrieval device is configured to place the opening of the bag body in an open state and to place the opening which is in the open state into a closed state.

25. The specimen retrieval device according to Claim 24, further comprising: an extrusion operation unit having a storage tube, a grip portion fixed to a proximal end portion of the storage tube, and an inner shaft inserted into the storage tube to be slidably in an axial direction, wherein the inner shaft is movable forward in the axial direction, from a first position where the bag body is stored inside the storage tube to a second position where the bag body is extruded from the storage tube.

26. The specimen retrieval device according to Claim 24 or 25, further comprising: an opening operation unit having a storage tube, a grip portion fixed to a proximal end portion of the storage tube, an inner shaft inserted into the storage tube to be slidable in an axial direction, and a pair of elastic pieces whose distal end side is in an open state in a natural state, wherein the pair of elastic pieces are fixed to a distal end portion of the inner shaft, and hold a vicinity of the opening, the inner shaft is movable forward in the axial direction, from a first position where the pair of elastic pieces are stored inside the storage tube to a second position where the pair of elastic pieces are brought into the natural state after being exposed from the storage tube, and the opening is elastically opened to be in the open state by moving the inner shaft forward to the second position.

27. The specimen retrieval device according to Claim 26, wherein the specimen retrieval bag includes a string body provided in an edge of the opening, the bag body includes a pair of string insertion portions formed on each of one side and the other side of the edge of the opening, and into which the string body is inserted, the string body is configured to bring the opening into the closed state, one of the pair of elastic pieces is inserted into one string insertion portion of the pair of string insertion portions, and the other of the pair of elastic pieces is inserted into the other string insertion portion of the pair of string insertion portions.

28. The specimen retrieval device according to Claim 27, wherein the elastic piece is formed in a plate shape, the elastic piece includes an arc-shaped curved portion curved in an arc shape in a direction closer to the other elastic piece toward the distal end side, a distal side portion connected to the distal end side of the arc-shaped curved portion, and a most distal end portion connected to a distal side of the distal side portion, and in the natural state, the most distal end portion of the elastic piece extends in a direction intersecting with a direction away from the most distal end portion of the other elastic piece toward the distal end side and with the axial direction.

29. The specimen retrieval device according to any one of Claims 26 to 28, wherein a second grip portion formed to have a larger diameter than an outer diameter of the inner shaft is provided in a proximal end portion of the inner shaft, and a normal direction of a proximal end side surface of the second grip portion is the same direction as the axial direction.

30. The specimen retrieval device according to Claim 27 or 28, wherein a portion of the string body is a lead-out portion led out from the pair of string insertion portions, a portion of the lead-out portion is introduced into the storage tube, and forms a loop portion, a holding portion holding the loop portion to be removable is provided in a proximal end portion of the inner shaft, and the holding portion is exposed from the storage tube in a state where the inner shaft is located at the first position.

31. The specimen retrieval device according to Claim 30, wherein the holding portion includes a pair of clamping portions disposed to face each other in a circumferential direction and clamping a portion of the lead-out portion, and a protruding portion disposed on a proximal side with respect to the pair of clamping portions and protruding outward in a radial direction, in a facing direction of the pair of clamping portions, a width dimension of the protruding portion is larger than a separation distance between the pair of clamping portions, and a portion of the lead-out portion passes through a gap between the pair of clamping portions from a distal side toward the proximal side, is hooked on the protruding portion, thereafter, passes again through the gap between the pair of clamping portions from the proximal side toward the distal side, and forms the loop portion.

32. The specimen retrieval device according to any one of Claims 26 to 31, wherein in a state where the inner shaft is located at the first position, the bag body is folded inside the storage tube while a virtual straight line different from a straight line passing through an intermediate point between the pair of elastic pieces is set as a central axis.

33. The specimen retrieval device according to Claim 32, wherein in a state where the inner shaft is located at the first position, the bag body is folded inside the storage tube in a state where the bag body is wound around the central axis serving as a winding axis.

34. The specimen retrieval device according to Claim 32 or 33, wherein in a radial direction, the central axis is disposed outside in an alignment direction of the pair of elastic pieces.

35. The specimen retrieval device according to Claim 28, wherein the specimen retrieval bag further includes a fastener formed in a tubular shape, and one end portion of the string body led out from the one string insertion portion to a side of the inner shaft and the other end portion of the string body led out from the other string insertion portion to the side of the inner shaft are each inserted into the fastener to be slidable.

36. The specimen retrieval device according to Claim 30 or 31, wherein in the inner shaft, a rearward movement restricting portion that restricts a rearward movement of the inner shaft to a proximal side with respect to the first position is provided on a distal side with respect to the holding portion.

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