Tissue recovery equipment

Abstract

To provide a tissue recovering implement for taking a recovered tissue to the outside of the body from the inside of the body that can take a recovered tissue to the outside of the body more readily and reliably than before.SOLUTION: A tissue recovering implement 1 takes a recovered tissue to the outside of the body from the inside of the body. The tissue recovering implement 1 includes: a storage part 11b having an opening 12 on an upper end side and storing a recovered tissue therein; and a directivity volume reduction part 14 for reducing a content volume of the storage part 11b toward an upper end side from a lower end side to move the recovered tissue to the upper end side from the lower end side.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present invention relates to an instrument for tissue collection for removing collected tissue (specimen) from the body to the outside in endoscopic surgery.

Background Art

[0002] Endoscopic surgeries such as thoracoscopic surgery and laparoscopic surgery are surgical methods in which an endoscope, a treatment instrument such as a scalpel, etc. are inserted through an incision wound of about several millimeters to several centimeters. Endoscopic surgery has a great advantage in that the burden on the patient is small because the incision wound is small. Tissue excised in the body by endoscopic surgery is placed in a tissue collection bag in the body cavity and taken out of the body by pulling out the bag together with the bag through the incision wound. The excised diseased tissue is put into a bag for the purpose of reducing problems caused by contact with healthy tissue. A conventional technique regarding such a tissue collection bag is disclosed by Patent Document 1.

Prior Art Documents

Patent Documents

[0005] In view of the above, the present invention aims to provide a tissue recovery device for removing recovered tissue from inside the body, which enables simpler and more reliable removal of recovered tissue from the body. [Means for solving the problem]

[0006] (Composition 1) A tissue recovery device for removing recovered tissue from inside the body, comprising: a storage section having an opening at one end for storing the recovered tissue inside; and a directional volume reduction section that reduces the internal volume of the storage section from the other end toward the one end, thereby moving the recovered tissue from the other end toward the one end.

[0007] (Configuration 2) The tissue recovery device according to configuration 1, wherein the directional volume reduction section comprises a variable volume member whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section, and a medium introduction section for introducing the introduction medium from the other end of the variable volume member, and the variable volume member has a medium movement resistance section that generates resistance to the movement of the introduction medium introduced inside from the other end to the one end.

[0008] (Composition 3) The tissue recovery device according to configuration 2, wherein the variable volume member comprises a plurality of partially variable volume members arranged sequentially from the other end to the one end of the storage portion.

[0009] (Composition 4) The tissue recovery device according to configuration 3, wherein a communication section connects a plurality of the partially variable volume members arranged in a plurality of positions, and the communication section restricts the movement of the introduced medium, thereby constituting the medium movement resistance section.

[0010] (Composition 5) The tissue recovery device according to configuration 3 or 4, wherein the medium movement resistance portion is formed by the partial variable volume member being formed by an expandable / contractible member.

[0011] (Composition 6) The tissue recovery device according to any one of configurations 3 to 5, wherein the partially variable volume member is an annular member along the outer circumference of the storage portion in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

[0012] (Composition 7) A tissue recovery device according to any one of configurations 3 to 5, wherein the partially variable volume member is divided into multiple parts in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

[0013] (Composition 8) The variable volume member is constituted by a tubular spiral member spirally arranged from the other end side to the one end side, and the medium movement resistance portion is constituted based on the frictional loss caused by the tubular member, the tissue collection instrument according to Configuration 2.

[0014] (Configuration 9) The tissue collection instrument according to Configuration 8, wherein the frictional loss is increased because the tubular spiral member is formed by an elastic member.

[0015] (Configuration 10) The variable volume member is constituted by a tubular variable volume member arranged to extend from the other end side to the one end side, and the medium movement resistance portion is constituted based on the frictional loss caused by the tubular member, the tissue collection instrument according to Configuration 2.

[0016] (Configuration 11) The tissue collection instrument according to Configuration 10, wherein a plurality of the tubular variable volume members are arranged.

[0017] (Configuration 12) The tissue collection instrument according to Configuration 11, comprising a medium introduction portion for independently introducing the introduction medium for each of the plurality of tubular variable volume members.

[0018] (Configuration 13) The tissue collection instrument according to any one of Configurations 10 to 12, wherein the frictional loss is increased because the tubular variable volume member is formed by an elastic member.

[0019] (Configuration 14) The tissue collection instrument according to any one of Configurations 8 to 13, wherein a valve for generating resistance to the movement of the introduction medium is provided in the tubular spiral member or the tubular variable volume member.

[0020] (Configuration 15) The directivity volume reduction part includes a partially variable volume member whose volume increases when an introduction medium is introduced therein, and the internal volume of the storage part is decreased. A plurality of the partially variable volume members are arranged in order from the other end side to the one end side of the storage part, and a medium introduction part for individually introducing the introduction medium to each of the plurality of partially variable volume members is provided. The tissue collection instrument according to Configuration 1.

[0021] (Configuration 16) The medium introduction part sequentially introduces the introduction medium to the partially variable volume members from the other end side to the one end side. The tissue collection instrument according to Configuration 15.

[0022] (Configuration 17) The introduction amount of the introduction medium per unit time to the partially variable volume member is larger on the other end side than on the one end side. The tissue collection instrument according to Configuration 15.

[0023] (Configuration 18) In a cross-sectional view taken substantially perpendicular to the axis extending from the other end side to the one end side of the storage part, the partially variable volume member is an annular member along the outer periphery of the storage part. The tissue collection instrument according to any one of Configurations 15 to 17.

[0024] (Configuration 19) In a cross-sectional view taken substantially perpendicular to the axis extending from the other end side to the one end side of the storage part, the partially variable volume member is divided into a plurality of parts. The tissue collection instrument according to any one of Configurations 15 to 17.

[0025] (Configuration 20) The partially variable volume member is formed by an expandable and contractible member. The tissue collection instrument according to any one of Configurations 15 to 19.

[0026] (Configuration 21) The directivity volume reduction part includes a partially variable volume member whose volume increases when an introduction medium is introduced therein, and the internal volume of the storage part is decreased. The tissue recovery device according to configuration 1, wherein at least one of the partially variable volume members is arranged on the other end side of the storage portion, and the length of the partially variable volume member in the direction from one end to the other end is 4 / 5 or less of the length of the storage portion in the direction from one end to the other end.

[0027] (Composition 22) The tissue recovery device according to configuration 21, wherein the partially variable volume member is divided into multiple parts in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

[0028] (Composition 23) The tissue recovery device according to configuration 1, wherein the directional volume reduction portion is composed of a flexible elongated member slidably wound around the outer circumference of the storage portion, one end of the flexible elongated member is directly or indirectly fixed to the location on the one end side of the storage portion, the flexible elongated member is wound around the outer circumference of the storage portion from the one end side to the other end side, and the other end of the flexible elongated member is pulled out toward the one end side of the storage portion.

[0029] (Composition 24) The tissue recovery device according to configuration 1, wherein the directional volume reduction portion is composed of a flexible elongated member slidably wound around the outer circumference of the storage portion, the intermediate portion of the flexible elongated member is directly or indirectly fixed to a location that is one end of the storage portion, the flexible elongated member is wound around the outer circumference of the storage portion from one end to the other end, and both ends of the flexible elongated member are pulled out toward the one end of the storage portion.

[0030] (Composition 25) A tissue recovery device according to configuration 23 or 24, wherein a plurality of the aforementioned flexible elongated members are arranged.

[0031] (Composition 26) The tissue recovery device according to configuration 25, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

[0032] (Composition 27) The tissue recovery device according to configuration 1, wherein the directional volume reduction portion comprises a flexible elongated member, one end of which is directly or indirectly fixed to the storage portion, wrapped around the outer circumference of the storage portion, and the other end of which is pulled out toward the one end of the storage portion, and a plurality of such flexible elongated members are arranged sequentially from the other end toward the one end of the storage portion.

[0033] (Composition 28) The tissue recovery device according to configuration 1, wherein the directional volume reduction portion comprises a flexible elongated member whose intermediate portion is directly or indirectly fixed to the storage portion, which is wound around the outer circumference of the storage portion, and whose ends are pulled out toward one end of the storage portion, and a plurality of such flexible elongated members are arranged sequentially from the other end toward the one end of the storage portion.

[0034] (Composition 29) The tissue recovery device according to configuration 27 or 28, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

[0035] (Composition 30) The tissue recovery device according to Configuration 1, wherein the directional volume reduction portion comprises a flexible elongated member, one end of which is directly or indirectly fixed to the storage portion and wound around the outer circumference of the storage portion, a plurality of the flexible elongated members are arranged sequentially from the other end to the one end of the storage portion, the other end of the flexible elongated member located furthest to the other end of the storage portion is pulled out toward the one end of the storage portion, and the other end of the other flexible elongated members is engaged with the flexible elongated member pulled out toward the one end of the storage portion such that it can slide for a predetermined distance and cannot slide beyond that distance, and the sliding distance of each of the flexible elongated members is longer for the flexible elongated member located toward the other end of the storage portion than for the flexible elongated member located toward the one end of the storage portion.

[0036] (Composition 31) A tissue recovery device according to any one of configurations 1 to 22, wherein at least a portion of the storage section is composed of the directional volume reduction section.

[0037] (Composition 32) A tissue recovery device according to any one of configurations 1 to 22, having an external restraining body that suppresses an increase in the external volume of the directional volume reduction section.

[0038] (Composition 33) A tissue recovery device according to any one of configurations 1 to 32, wherein the cross-sectional area of ​​the storage section, which is substantially perpendicular to the axis extending from one end to the other end, decreases as it moves from one end to the other end.

[0039] (Composition 34) A tissue retrieval device according to any one of configurations 1 to 33, comprising a display that serves as an indicator of the insertion position into the body when at least a portion of the tissue retrieval device is inserted into the body.

[0040] (Composition 35) A tissue recovery device according to any one of configurations 1 to 34, wherein the length of the storage section in the direction from one end to the other end is 25 cm or less. [Effects of the Invention]

[0041] According to the tissue recovery device of the present invention, by providing a directional volume reduction unit that moves the recovered tissue towards the opening, it becomes possible to remove the recovered tissue from the body more easily and reliably. [Brief explanation of the drawing]

[0042] [Figure 1] A diagram showing a tissue recovery device according to Embodiment 1 of the present invention. [Figure 2] A cross-sectional view of the tissue recovery device of Embodiment 1. [Figure 3] Diagram showing the directional volume reduction section of Embodiment 1 [Figure 4] Diagram illustrating the operation of the tissue recovery device of Embodiment 1 [Figure 5]A diagram conceptually illustrating the tissue recovery device of Embodiment 2. [Figure 6] A diagram conceptually illustrating another example of the tissue recovery device of Embodiment 2. [Figure 7] A cross-sectional view of the tissue recovery device of Embodiment 3. [Figure 8] Diagram showing the directional volume reduction section of Embodiment 3 [Figure 9] A diagram conceptually showing the tissue recovery device of Embodiment 4. [Figure 10] A diagram conceptually showing the tissue recovery device of Embodiment 5. [Figure 11] A diagram conceptually showing the tissue recovery device of Embodiment 6. [Figure 12] A diagram conceptually showing the tissue recovery device of Embodiment 6. [Figure 13] A cross-sectional view of the tissue recovery device of Embodiment 7. [Figure 14] Diagram showing the directional volume reduction section of Embodiment 7 [Figure 15] Diagram illustrating the operation of the tissue recovery device of Embodiment 7 [Figure 16] A cross-sectional view of another example of the tissue recovery device of Embodiment 7. [Figure 17] A diagram showing another example of the directional volume reduction unit of Embodiment 7. [Figure 18] A diagram conceptually illustrating another example of the tissue recovery device of Embodiment 7. [Figure 19] A diagram conceptually showing the tissue recovery device of Embodiment 8. [Figure 20] This diagram conceptually shows the arrangement of a flexible elongated member on the outer circumference of the opening of another example of the tissue retrieval device of Embodiment 8. [Figure 21] A diagram conceptually showing the tissue recovery device of Embodiment 9. [Figure 22] A diagram conceptually showing the tissue recovery device of Embodiment 10. [Figure 23] A cross-sectional view of the tissue recovery device of Embodiment 11. [Figure 24] Diagram illustrating the operation of the tissue recovery device of Embodiment 11 [Figure 25] Diagram illustrating conventional tissue recovery bags. [Modes for carrying out the invention]

[0043] The embodiments of the present invention will be described in detail below with reference to the drawings. Note that the following embodiments are merely examples of how the present invention can be implemented, and do not limit the present invention to their scope.

[0044] <Embodiment 1> Figure 1 shows a tissue recovery device 1 according to Embodiment 1 of the present invention, and Figure 2 is a cross-sectional view of the tissue recovery device 1. The tissue retrieval device 1 is a tissue retrieval device used to remove tissue from inside the body during thoracoscopic surgery, laparoscopic surgery, etc. In its basic form, the tissue retrieval device 1 comprises a storage section 11b having an opening 12 at one end (upper side in the figure) for storing the retrieved tissue inside, and a directional volume reduction section 14 that reduces the internal volume of the storage section 11b from the other end (lower side in the figure) toward the one end, thereby moving the retrieved tissue from the other end toward the one end. In the following explanation, the end with the opening 12 will be referred to as the "upper side," and the other end as the "lower side."

[0045] The storage section 11b is a bag-shaped member having an opening 12 for storing the recovered tissue inside, and as shown in Figure 2, in this embodiment, together with the outer restraint body 11a, it constitutes the bag section 11. As will be explained later, the storage section 11b is formed of a flexible member because its internal volume is reduced by being squeezed by the directional volume reduction section. The flexible member may be made flexible by structural ingenuity, or the material properties of the member may be flexible, or any combination thereof. The structural ingenuity is not particularly limited as long as it is expandable, and a bellows structure is preferred among them. The storage section 11b does not necessarily have to be folded in a regular manner, and may be folded arbitrarily by creases created when the volume of the directional volume reduction section 14 is reduced (folded) from its maximum state (expanded state). As a material possessing properties that provide flexibility, a flexible, soft synthetic resin is preferred. In terms of compatibility with living tissue or excised organs (such as slipperiness and biocompatibility), a thin film of urethane resin is most suitable. However, the use of other thin films of synthetic resins is not excluded as long as they are suitable for endoscopic surgery. Examples include thermoplastic resins such as polyethylene, polyamide, ethylene-vinyl acetate copolymer, polyurethane, and polypropylene, as well as rubber-based materials such as silicone rubber and other soft materials. As will be explained below, the tissue retrieval device 1 has the function of moving the retrieved tissue stored inside upwards by squeezing it. To facilitate the movement of the retrieved tissue, it is preferable to apply a process to the surface that comes into contact with the retrieved tissue, such as the storage section 11b, to further improve its slipperiness to the retrieved tissue. One example of such a process is hydrophilic processing. That is, a water-soluble polymer is immobilized on the material surface. For example, there is a method of introducing radical active groups to the material surface by gamma ray irradiation, ozone treatment, or low-temperature plasma treatment, and surface grafting acrylamide or N-vinylpyrrolidone. Another method involves solvent coating with water-soluble polymers. Specifically, this involves coating the substrate surface with a polyisocyanate compound and then immobilizing a water-soluble polymer containing active hydrogen on it by covalent bonding.Furthermore, a coating process such as coating with a fluororesin or silicone resin may be applied. In addition, the surface may be finely roughened. The microstructure may be random, or a process that imparts directionality may be applied. As a process that imparts directionality, grooves may be cut from one end to the other end, that is, parallel to the extrusion direction of the organ.

[0046] In this embodiment, the storage section 11b has an inverted cone shape. That is, the cross-sectional area approximately perpendicular to the axis extending from the upper end to the lower end decreases as it moves from the upper end to the lower end. The outer restraint 11a is positioned outside the directional volume reduction section 14 and prevents an increase in the external volume of the directional volume reduction section 14. Therefore, it is desirable that the outer restraint 11a be made of a material that does not stretch substantially. It is preferable that synthetic resin be used for the non-stretchable material, and a thin film of urethane resin is most suitable in terms of compatibility with living tissue or excised organs (slipperiness, biocompatibility, etc.), but the use of other thin films of synthetic resin is not excluded as long as they are suitable for endoscopic surgery. Examples include thermoplastic resins such as polyethylene, polyamide, ethylene-vinyl acetate copolymer, polyurethane, and polypropylene, rubber-based materials such as silicone rubber, and other soft materials. Furthermore, it is desirable that the outer restraint 11a be made of a biocompatible material, and that the storage section 11b also be made of a biocompatible material. In the tissue recovery device 1 of this embodiment, the outer restraint body 11a and the storage portion 11b are integrally formed, and the bag portion 11 is constructed by folding the storage portion 11b back into the interior of the outer restraint body 11a. Of course, the outer restraint body 11a and the storage section 11b may be formed as separate components.

[0047] Figure 3 shows the directional volume reduction section 14. The directional volume reduction section 14 is a component that reduces the internal volume of the storage section 11b from the lower side to the upper side by narrowing the storage section 11b from below. The directional volume reduction section 14 is a variable volume member that reduces the internal volume of the storage section 11b by increasing its volume when an introduction medium such as liquid is introduced inside it, and comprises a plurality of partially variable volume members 141a to 141f arranged sequentially from the lower end to the upper end of the storage section 11b. Multiple partially variable volume members 141a to 141f are interconnected by a connecting section 142, allowing the introduction medium to pass through them (see Figure 2). A media inlet 143, which is the inlet for introducing the media, is formed at the lower end of the directional volume reduction section 14, and a media introduction section 131 for introducing the media is connected to it. A hand pump 132 is also connected to the media introduction section 131. The directional volume reduction section 14 is preferably formed from a biocompatible material.

[0048] Each of the variable volume members 141a to 141f is a donut-shaped member arranged around the storage section 11b. That is, in a cross-sectional view approximately perpendicular to the axis extending from the upper end to the lower end, it is an annular member along the outer circumference of the storage section 11b. The directional volume reduction section 14 is shaped to generally follow the perimeter of the storage section 11b, and therefore, each of the variable volume members 141a to 141f becomes smaller as you move from the upper end to the lower end. Each of the partially variable volume members 141a to 141f in this embodiment is formed of an elastic material and is a donut-shaped balloon whose volume is small when no introduction medium is filled in, and increases when the introduction medium is filled in.

[0049] The directional volume reduction section 14 has a medium movement resistance section that generates resistance to the movement of the introduced medium, such as liquid, introduced from its lower end towards its upper end. In this embodiment, the partially variable volume members 141a to 141f are formed of an elastic material, and the median movement resistance section is formed by the connecting portion 142. The partially variable volume members 141a to 141f form elastic members, so that a predetermined pressure is required when increasing the volume of each of the partially variable volume members 141a to 141f. This causes greater frictional loss for the introduced medium flowing through them, and thus functions as a medium movement resistance section. When forming the partially variable volume members 141a to 141f with elastic members, the upper partially variable volume member may be made to have a higher modulus of elasticity than the lower one. The modulus of elasticity may be changed by using different materials, or, for example, the same material may be used, but the upper partially variable volume member may be made of a thicker material. Furthermore, the communication section 142 restricts the movement of the introduced medium by narrowing the flow path, thereby functioning as a medium movement resistance section. In this embodiment, as shown in Figure 2, the communication sections 142 are arranged in a straight line in the vertical direction as an example, but the communication sections 142 may be arranged so that they are not aligned in a straight line in the vertical direction, thereby making it more difficult for the introduced medium to move towards the upper end.

[0050] Figure 4 is an explanatory diagram illustrating the operation of the tissue retrieval device 1. In thoracoscopic surgery, laparoscopic surgery, etc., a tissue retrieval device 1 is used to remove tissue such as diseased organs that have been excised from inside the body. The tissue retrieval device 1 is placed in the body cavity, and the retrieved tissue Sp is placed into the bag (storage section 11b). The introduction of the retrieval bag into the body cavity and the placement of the retrieved tissue into the retrieval bag within the body cavity can be performed using conventionally used devices or in the same manner as in the past; therefore, a detailed explanation is omitted here. After placing the recovered tissue Sp into the storage section 11b, with the opening 12 pulled out from the body surface S, the introduction medium is sent to the directional volume reduction section 14 via the medium introduction section 131 using the hand pump 132. The introduced medium is introduced from the lower end of the directional volume reduction section 14 and, due to the function of the "medium movement resistance section" described above, it is resisted from moving upward. In other words, it is prevented from immediately flowing into the upper part variable volume member. Therefore, the introduced medium is introduced into each part variable volume member 141a to 141f in order from the lower end. As a result, as shown in Figure 4, each part variable volume member 141a to 141f expands upward in order from the lowest part variable volume member 141a. As the partially variable volume members 141a to 141f expand, the internal volume of the storage section 11b decreases. As a result, the internal volume of the storage section 11b decreases sequentially from the lower end towards the upper end as it is squeezed upwards. As a result, as shown in Figure 4, the recovered tissue Sp in the storage section 11b is squeezed upwards and can be easily removed from the body. In this embodiment, the tissue recovery device 1 has an inverted cone shape for the outer restraint body 11a and the directional volume reduction section 14, so the internal volume of the storage section 11b decreases more quickly at the lower end. This allows the "squeezing from the lower end" function described above to be performed more effectively.

[0051] As described above, the tissue recovery device 1 of this embodiment allows for simpler and more reliable removal of recovered tissue from the body. As explained using Figure 25, in the case of the recovery bag of Patent Document 1, the fluid F can reach the opening side of the recovered tissue Sp, and if the inner bag 110 is closed based on the pressure of the fluid F, there is a problem in that the tissue Sp cannot be successfully extracted. In contrast, with the tissue recovery device 1, even in the posture shown in Figure 25, the introduction medium is introduced sequentially from the partially variable volume member 141a to the partially variable volume member 141f, thus enabling more reliable removal of the recovered tissue from the body.

[0052] Furthermore, the introduced medium can be any medium that can be introduced into the variable volume member to increase its volume, including not only fluids such as liquids and gases, but also powders, granules, and viscous materials. It is also possible to use a medium that has greater frictional resistance than liquids and gases, such as a powder, granules, or viscous material, in order to "create resistance to the movement of the introduced medium from one end to the other."

[0053] In this embodiment, the partially variable volume member is shown as being made of an elastic material, but the present invention is not limited to this. The partially variable volume member only needs to be one whose volume increases upon the introduction of an introduction medium, and any stretchable material can be used, or it may be made of a non-stretchable material. That is, even if the material is not stretchable at all, its volume can be increased when an introduction medium is introduced into it from a folded state (in this case, the function as a "medium movement resistance part" may be small, but this is not a problem if the function as a "medium movement resistance part" is obtained by a flow part, etc.). It is preferable that synthetic resin be used for the partially variable volume member, and a thin film of urethane resin is most preferable in terms of compatibility with living organisms or excised organs (slipperiness, biocompatibility, etc.), but the use of other thin films of synthetic resin is not excluded as long as they are suitable for endoscopic surgery. For example, thermoplastic resins such as polyethylene, polyamide, ethylene-vinyl acetate copolymer, polyurethane, and polypropylene, rubber-based materials such as silicone rubber, and other soft materials can be used. Furthermore, in this embodiment, a configuration with six stages of partially variable volume members (partially variable volume members 141a to 141f) is used as an example, but of course, the number of stages of the partially variable volume members can be increased or decreased as appropriate.

[0054] In this embodiment, an example is given in which an outer restraint body 11a is provided, but the outer restraint body 11a is not essential. However, providing the outer restraint body 11a is preferable because it restricts the directional volume reduction section 14 from expanding outward, thereby efficiently reducing the internal volume of the storage section 11b. Furthermore, the storage section 11b does not necessarily need to be provided separately from the directional volume reduction section 14. For example, as can be seen from Figure 3, the directional volume reduction section 14 itself can function as the storage section, that is, the storage section can be constructed using the directional volume reduction section. In this case, it is advisable to apply the aforementioned processing to the directional volume reduction section that comes into contact with the recovered tissue to improve its slipperiness.

[0055] In this embodiment, a hand pump is used as an example to deliver the medium, but the present invention is not limited to this, and any means capable of delivering the medium, such as an electric pump or syringe, can be used (the appropriate means should be selected depending on the type of medium to be delivered).

[0056] A valve may be provided on the flow path of the introduced medium (partially variable volume member or communication section) to create a "medium movement resistance section" that resists the movement of the introduced medium as it moves from the lower end to the upper end. For example, a valve that is biased to block the flow path may be provided so that the introduced medium cannot move past the valve unless the pressure of the introduced medium exceeds this biasing force.

[0057] <Embodiment 2> Figure 5 is a conceptual diagram showing the tissue recovery device 2 of Embodiment 2. The basic concept of the tissue recovery device 2 in this embodiment is the same as that of the tissue recovery device 1 in Embodiment 1, and it has the function of a "medium movement resistance part" that creates resistance to the movement of the introduced medium introduced from the lower end towards the upper end, thereby "tightening the storage part from the lower end". Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0058] The tissue recovery device 2, similar to Embodiment 1, is composed of an outer restraint body 11a and a storage section 11b, and includes a bag section 11 having an opening 12. In this embodiment, a plurality of directional volume reduction units 24-1 to 24-3 are arranged in the area between the outer restraint body 11a and the storage unit 11b.

[0059] Since each of the directional volume reduction units 24-1 to 24-3 has basically the same configuration, we will describe the directional volume reduction unit 24-1 here. As can be seen from the rightmost diagram in Figure 5, the directional volume reduction section 24-1 has a plurality of expansion sections 241a1 to 241d1 arranged in the vertical direction. The volume during expansion increases from the lower end 241a1 to the upper end 241d1, and the sections from the lower end 241a1 to the upper end 241d1 are interconnected by a connecting section (not shown in particular) that allows the introduction medium to pass through. An introduction section, branched from the media introduction section 131, is connected to the lower end of the directional volume reduction section 24-1, and the media is introduced from the lower end. Furthermore, the expansion sections 241a1 to 241d1 are balloons formed of an elastic material, and the flow path is narrowed at the connecting section. These components function as a "medium movement resistance section" that creates resistance to the movement of the introduced medium from the lower end towards the upper end. Consequently, the directional volume reduction section 24-1 can sequentially reduce the internal volume of the storage section 11b from the lower end towards the upper end, and has the function of moving the recovered tissue from the lower end towards the upper end.

[0060] Each of the directional volume reduction units 24-2 and 3, having a configuration similar to that of the directional volume reduction unit 24-1 described above, is symmetrically arranged along the outer circumference of the opening 12 when viewed from above, and the media is introduced by an introduction unit branched from a common media introduction unit 131. As can be seen from Figure 5, with this configuration, when the introduction medium is introduced, the expansion parts 241a1, 241a2, and 241a3 at the lower end expand first, followed by the expansion parts 241b1, 241b2, and 241b3, and so on, with the expansion progressing sequentially from the lower end to the upper end. This process gradually reduces the internal volume of the storage section 11b by squeezing it upwards from the lower end, thereby squeezing the recovered tissue Sp inside the storage section 11b upwards. As can be understood from the above explanation, the basic concept of the tissue recovery device 2 is the same as in Embodiment 1. That is, the expansion parts 241a1 to 241a3 can be considered as a single partially variable volume member. Similarly, each of the expansion parts 241b1 to 241b1 to 241c1 to 241c1 to 241d1 to 241d3 can be considered as a partially variable volume member, and it can be considered that multiple of these partially variable volume members are arranged from the lower end to the upper end and are connected to each other by connecting parts. According to this view, in a cross-sectional view substantially perpendicular to the axis extending from the lower end to the upper end, the partially variable volume member of Embodiment 1 can be considered to be divided into multiple parts, forming the expansion parts 241a1 to 241a3, etc. As with Embodiment 1, the number of stages as a partially variable volume member may be increased or decreased. Furthermore, the number of divisions in a cross-sectional view approximately perpendicular to the axis extending from the lower end to the upper end may also be increased or decreased. That is, for example, only the directional volume reduction section 24-1 may be provided, or four or more directional volume reduction sections may be provided.

[0061] As described above, the tissue recovery device 2 of this embodiment can provide the same effects and advantages as in Embodiment 1. It should be noted that, as in Embodiment 1, each expansion portion constituting the partially variable volume member may be formed from any expandable or expandable member, or from a member that is not expandable or expandable at all, and that a valve may be provided on the flow path of the introduced medium to create resistance to the movement of the introduced medium.

[0062] In the tissue recovery device 2, the introduction medium is introduced to the directional volume reduction sections 24-1 to 24-3 by an introduction section branched from a common medium introduction section 131, as an example. However, the introduction medium may be introduced to each section individually. Figure 6 shows an example of such a thing. The tissue recovery device 2-1 in Figure 6 is similar to the tissue recovery device 2 in other respects, except that each of the directional volume reduction sections 24-1 to 24-3 is individually equipped with a media introduction section 131-1 to 24-3. Although not shown in the figure, a hand pump or the like is provided to allow the media to be individually introduced into each of the media introduction sections 131-1 to 24-3. With the tissue recovery device 2-1, the introduction medium can be individually supplied to each of the directional volume reduction sections 24-1 to 24-3, so it can also be used to move the recovered tissue horizontally. For example, by supplying the introduction medium only to the directional volume reduction section 24-1, it becomes possible to move the recovered tissue upwards while moving it to the right, as shown in Figure 6.

[0063] <Embodiment 3> Figure 7 is a cross-sectional view of the tissue recovery device 3 of Embodiment 3, and Figure 8 is a diagram showing the directional volume reduction section 34 of Embodiment 3. The basic concept of the tissue recovery device 3 in this embodiment is the same as that of the tissue recovery device 1 in Embodiment 1, and it has the function of a "medium movement resistance part" that creates resistance to the movement of the introduced medium introduced from the lower end towards the upper end, thereby "tightening the storage part from the lower end". Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0064] The tissue recovery device 3, similar to Embodiment 1, is composed of an outer restraint body 11a and a storage section 11b, and includes a bag section 11 having an opening 12. In this embodiment, a directional volume reduction section 34 is provided between the outer restraint body 11a and the storage section 11b. This section is composed of a tubular spiral member 341 that is spirally arranged from the lower end to the upper end. The tubular spiral member 341 is a variable volume member whose volume increases when an introduction medium is introduced into it, thereby reducing the internal volume of the storage section 11b.

[0065] As shown in Figure 8, the directional volume reduction section 34 is composed of tubular members made of elastic material arranged in a spiral pattern (tubular spiral member 341), and the medium introduction section 131 is connected to its lower end. Therefore, the media introduced by the media introduction section 131 flows sequentially upward through the inside of the tubular spiral member 341. At this time, friction loss occurs as the media passes through the tubular member, and this friction loss is amplified because the tubular member is an elastic material. This configuration that causes friction loss functions as a "media movement resistance section" that creates resistance to the movement of the media introduced from the lower end towards the upper end. Therefore, the directional volume reduction section 34 can sequentially reduce the internal volume of the storage section 11b from the lower end to the upper end, and has the function of moving the recovered tissue from the lower end to the upper end.

[0066] As described above, the tissue recovery device 3 of this embodiment can provide the same effects and advantages as in Embodiment 1. The tubular spiral member constituting the directional volume reduction section may be formed from any expandable or expandable member, or from a member that is not expandable at all, and a valve may be provided on the flow path of the introduced medium to create resistance to the movement of the introduced medium, etc., as in Embodiment 1.

[0067] <Embodiment 4> Figure 9 is a conceptual diagram showing the tissue recovery device 4 of Embodiment 4. The basic concept of the tissue recovery device 4 in this embodiment is the same as that of the tissue recovery device 1 in Embodiment 1, and it has the function of a "medium movement resistance part" that creates resistance to the movement of the introduced medium introduced from the lower end towards the upper end, thereby "tightening the storage part from the lower end". Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0068] The tissue recovery device 4, similar to Embodiment 1, is composed of an outer restraint body 11a and a storage section 11b, and includes a bag section 11 having an opening 12. In this embodiment, directional volume reduction sections 44-1 to 44-3 are arranged between the outer restraint body 11a and the storage section 11b. These sections are composed of tubular variable volume members that extend from the lower end to the upper end. The directional volume reduction sections 44-1 to 44-3 are variable volume members whose volume increases when an introduction medium is introduced into them, thereby reducing the internal volume of the storage section 11b.

[0069] Since each of the directional volume reduction units 44-1 to 44-3 has basically the same configuration, we will describe the directional volume reduction unit 44-1 here. As shown in Figure 9, the directional volume reduction section 44-1 is configured by arranging a tubular member (tubular variable volume member) made of an elastic material so as to extend from the lower end to the upper end, and an introduction section branched from the media introduction section 131 is connected to its lower end. Therefore, the introduced medium introduced by the introduction section branched from the medium introduction section 131 flows into the tubular variable volume member from the top. At this time, friction loss occurs as the introduced medium passes through the tubular member, and this friction loss is increased because the tubular member is an elastic material. This configuration that causes friction loss functions as a "medium movement resistance section" that creates resistance to the movement of the introduced medium introduced from the bottom end towards the top end. Therefore, the directional volume reduction section 44-1 can sequentially reduce the internal volume of the storage section 11b from the bottom end to the top end, and has the function of moving the recovered tissue from the bottom end to the top end.

[0070] Each of the directional volume reduction units 44-2 and 44-3, having a configuration similar to that of the directional volume reduction unit 44-1 described above, is symmetrically arranged along the outer circumference of the opening 12 when viewed from above, and the media is introduced by an introduction unit branched off from a common media introduction unit 131. As can be seen from Figure 9, with this configuration, when the introduction medium is introduced, each directional volume reduction section 44-1 to 44-3 gradually expands from the lower end. This process gradually reduces the internal volume of the storage section 11b by squeezing it upwards from the lower end, thereby squeezing the recovered tissue Sp inside the storage section 11b upwards.

[0071] As described above, the tissue recovery device 4 of this embodiment can provide the same effects and advantages as in Embodiment 1. The directional volume reduction section (tubular variable volume member) may be formed from any expandable or expandable member, or from a member that is not expandable at all, and a valve may be provided on the flow path of the introduced medium to create resistance to the movement of the introduced medium, etc., as in Embodiment 1. Furthermore, it is also perfectly acceptable to increase or decrease the number of directional volume reduction sections (tubular variable volume members) (even if there is only one directional volume reduction section).

[0072] In this embodiment, the introduction medium is introduced to the directional volume reduction units 44-1 to 44-3 by an introduction unit branched from a common medium introduction unit 131. However, the introduction medium may be introduced to each unit individually. In other words, based on the same concept as the tissue recovery device 2-1 described in Figure 6, independent media introduction sections 131-1 to 3 may be provided for each of the directional volume reduction sections 44-1 to 44-3. This configuration allows for the recovery of tissue in a horizontal direction when moving the tissue.

[0073] <Embodiment 5> Figure 10 is a conceptual diagram showing the tissue recovery device 5 of Embodiment 5. The tissue recovery device 5 of this embodiment includes partially variable volume members 54-1 to 54-3 whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section 11b. Multiple partially variable volume members 54-1 to 54-3 are arranged sequentially from the lower end to the upper end of the storage section 11b. It also includes medium introduction sections 131-1 to 54-3 for individually introducing the introduction medium into each of the partially variable volume members 54-1 to 54-3. Although not shown in the figure, a pump or the like is provided to allow the introduction medium to be individually supplied to each of the medium introduction sections 131-1 to 54-3. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0074] Each of the variable volume members 54-1 to 54-3 is made of an elastic material and is a donut-shaped member arranged around the storage section 11b. That is, in a cross-sectional view approximately perpendicular to the axis extending from the upper end to the lower end, it is an annular member along the outer circumference of the storage section 11b.

[0075] In the tissue recovery device 5, as shown in Figure 10, the introduction medium is introduced sequentially from the partially variable volume member 54-1 at the lower end to the partially variable volume member 54-3 at the upper end, causing the partially variable volume member at the lower end to expand sequentially. As a result, the internal volume of the storage section 11b decreases sequentially from the lower end to the upper end, as if being squeezed upwards, and the recovered tissue Sp inside the storage section 11b moves upwards as it is squeezed.

[0076] As described above, the tissue recovery device 5 of this embodiment allows for simpler and more reliable removal of the recovered tissue from the body. As with Embodiment 1, the partially variable volume member may be formed from any stretchable or non-stretchable member. Furthermore, it is also possible to increase or decrease the number of partially variable volume members. For example, it is possible to set the number of stages of the partially variable volume member to one stage; an example of this will be described later in Embodiment 11.

[0077] The method for sequentially introducing the introduction medium into each of the variable volume members 54-1 to 54-3 may involve manually operating hand pumps or the like connected to each medium introduction section 131-1 to 54-3 in sequence, or it may involve automatically controlling the operation of an electric pump or the like. When automatically controlling the operation of an electric pump or the like, the amount of introducing medium corresponding to the capacity of each partially variable volume member 54-1 to 54-3 should be supplied sequentially, starting from the lower partially variable volume member. Alternatively, a pressure gauge may be provided to supply the introducing medium until a predetermined pressure is reached, at which point supply to the next (upper) partially variable volume member may begin. The timing of introducing the introducing medium to each partially variable volume member may also overlap to some extent.

[0078] When introducing the introduction medium to each of the variable volume members 54-1 to 54-3, the amount introduced per unit time may be greater at the lower end than at the upper end. For example, even if the introduction of the medium is started simultaneously for each of the partially variable volume members 54-1 to 54-3, by increasing the amount of medium introduced per unit time at the lower end compared to the upper end, the effect of squeezing from the lower end of the storage section 11b can be obtained. Furthermore, by making the storage section an inverted cone shape, the capacity at the lower end is smaller than that at the upper end, so for example, even if the same amount of medium is introduced simultaneously for each of the partially variable volume members 54-1 to 54-3, the effect of squeezing from the lower end of the storage section 11b can be obtained.

[0079] <Embodiment 6> Figure 11 is a conceptual diagram showing the tissue recovery device 6 of Embodiment 6. The basic concept of the tissue recovery device 6 in this embodiment is the same as that of the tissue recovery device 5 in Embodiment 5. Multiple partially variable volume members 64-1 to 64-4 are arranged sequentially from the lower end to the upper end of the storage section 11b. By introducing the introduction medium into each of the partially variable volume members 64-1 to 64-4 sequentially from the lower end, the internal volume of the storage section 11b is gradually reduced from the lower end to the upper end, thereby moving the recovered tissue Sp inside the storage section 11b to the upper side. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0080] The tissue recovery device 6 differs from Embodiment 5 in that each of the partially variable volume members 64-1 to 64-4 is divided into multiple sections in a cross-sectional view substantially perpendicular to the axis extending from the lower end to the upper end, and each of the resulting expanded bodies is individually provided with a medium introduction section.

[0081] Since each of the partially variable volume members 64-1 to 64-4 is based on essentially the same concept, we will explain the partially variable volume member 64-4 located at the upper end here. The partially variable volume member 64-4 is composed of expandable bodies 64-4a to c formed by an elastic member, and each expandable body 64-4a to c is provided with a medium introduction section 131-4a to c for introducing an introduction medium individually.

[0082] As can be seen from Figure 12, the tissue recovery device 6, similar to embodiment 5, allows the internal volume of the storage section 11b to be gradually reduced from the lower end to the upper end, thereby moving the recovered tissue inside the storage section 11b to the upper side. In addition, since the introduction medium can be introduced individually to any inflatable body, it is also possible to guide the recovered tissue in the storage section 11b in any direction. As with Embodiment 1, each expandable member constituting the partially variable volume member may be formed from any expandable or expandable member, or from a member that is not expandable or expandable at all. Furthermore, it is also perfectly acceptable to increase or decrease the number of partially variable volume members, or to increase or decrease the number of expandable bodies that constitute the partially variable volume members. Furthermore, the method for introducing the media into each expansion body can be either manual or automatic, and in the case of automatic introduction, it may be based on flow rate control, pressure control, etc., as in Embodiment 5.

[0083] <Embodiment 7> Figure 13 is a cross-sectional view of the tissue recovery device 7 of Embodiment 7, and Figure 14 is a diagram showing the directional volume reduction section 74 of Embodiment 7. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0084] The tissue recovery device 7, similar to Embodiment 1, is composed of an outer restraint body 11a and a storage section 11b, and includes a bag section 11 having an opening 12. In this embodiment, a directional volume reduction section 74 is provided at the location between the outer restraint body 11a and the storage section 11b. As shown in Figure 14, the directional volume reduction section 74 includes a flexible elongated member (a string member 741 in this embodiment) that is slidably wound around the outer circumference of the storage section 11b. One end of the string member 741 is directly or indirectly fixed to the upper end point 744, and the string member 741 is wound around the outer circumference of the storage section 11b from the upper end to the lower end, with the other end of the string member 741 being pulled out from the upper end of the storage section 11b. The directional volume reduction section 74 is equipped with string insertion members 743a to f for maintaining the "winding" arrangement of the string member 741. Each string insertion member 743a to f has basically the same configuration and is a flexible ring-shaped or strip-shaped member with an insertion section on its outer circumference through which the string member 741 is slidably inserted. The insertion section is formed around the outer circumference of the ring, and the entrance and exit points for the string member 741 to the insertion section are formed at locations that are oriented in approximately the same direction for the string insertion members 743a to f. The string member 741 that exits from the exit of the string insertion member enters from the entrance of the string insertion member on the lower side, and the string member 741 that exits from the exit after circling around the string insertion member once enters again from the entrance of the string insertion member on the lower side, and this configuration is repeated. The uppermost string insertion member 743f does not have an entrance, and one end of the string member 741 is fixed at point 744. The string member 741 that exits from the exit 745 of the lowest string insertion member 743a is pulled out from the upper end side of the storage section 11b, and the handle 772 is fastened to its end (see Figure 13).

[0085] Figure 15 is an explanatory diagram illustrating the operation of the tissue retrieval device 7. After placing the recovered tissue Sp into the storage section 11b, and with the opening 12 pulled out from the body surface S, pulling the string member 741 with the handle 772 creates an action that causes the strings to contract sequentially, starting from the lower end string insertion member 743a. The tensile force generated by pulling the handle 772 causes the string member 741 to slide against each string insertion member 743a to f, causing each string insertion member to contract, and in this process, the strings contract sequentially starting from the lower end string insertion member 743a. To explain this action in detail, the string member 741 is arranged to wrap around the outer circumference of the storage section 11b from the upper end to the lower end, and is therefore pulled from the lower end. Here, if the handle 772 side of the string member 741 is the base end and the point 744 side is the tip end, the sliding string member 741 receives frictional resistance along its path. Therefore, the attenuation of the tensile force is small at the base end, but as it moves towards the tip end, the length of the sliding path increases, and the attenuation due to frictional resistance increases accordingly, so the tensile force weakens as it moves towards the tip end. Consequently, a stronger tensile force acts on the string insertion members closer to the lower end, and an action works to contract them sequentially starting from the string insertion member 743a at the lower end. As a result of this action, as shown in Figure 15, the string insertion member 743a at the lower end is tightened sequentially from the string insertion member 743f at the upper end, thereby sequentially reducing the internal volume of the storage section 11b from the lower end towards the upper end, and moving the recovered tissue Sp inside the storage section 11b to the upper side.

[0086] As described above, the tissue recovery device 7 of this embodiment allows for simpler and more reliable removal of the recovered tissue from the body. In this embodiment, a string member was used as an example of a flexible elongated member, but the present invention is not limited to this, and any flexible member can be used, such as a band-shaped or belt-shaped member. Furthermore, as will be explained in the following embodiments, multiple flexible elongated members may be provided. Furthermore, in this embodiment, a configuration with six string insertion members (string insertion members 743a to 743f) is used as an example, but of course, the number of string insertion members can be increased or decreased as appropriate. In this embodiment, an example is shown in which an external restraint body 11a is provided, but the external restraint body 11a is not essential. Furthermore, the storage section 11b does not necessarily need to be provided separately from the directional volume reduction section 14. For example, as can be seen from Figure 14, the directional volume reduction section 74 itself can function as the storage section, that is, the storage section can be constructed using the directional volume reduction section.

[0087] In this embodiment, a ring-shaped string insertion member is shown as being arranged in a stacked configuration, but as shown in Figures 16 and 17, a spiral-shaped string insertion member may also be provided. Figure 16 is a cross-sectional view of tissue recovery device 7-1, which is another example of a tissue recovery device, and Figure 17 is a view of the directional volume reduction section 74-1 of tissue recovery device 7-1. The tissue recovery device 7-1 has the same configuration as the tissue recovery device 7, except for the directional volume reduction unit 74-1. The directional volume reduction section 74-1 includes a string insertion member 743-1 for maintaining the "winding" arrangement of the string member 741. The string insertion member 743-1 is a flexible, strip-shaped member that is spirally wound around the storage section 11b and has an insertion portion on its outer circumference through which the string member 741 is slidably inserted. The string member 741 is fixed directly or indirectly at the upper end point 744, wound spirally through the insertion section toward the lower end, and the string member 741 that exits from the lower end outlet 745 is pulled out from the upper end of the storage section 11b. The tissue recovery device 7-1 having the above configuration can achieve the same effects and advantages as the tissue recovery device 7.

[0088] In this embodiment, a flexible elongated member is shown as being wound in a spiral shape, but the present invention is not limited to this. For example, as shown in Figure 18, the flexible elongated member can be wound around the outer circumference of the storage section from the upper end to the lower end. Figure 18 is a conceptual diagram of another example of a tissue recovery device, tissue recovery device 7-2. The tissue retrieval device 7-2 is similar to the tissue retrieval device 7 in that the string member 741 is arranged to wrap around the outer circumference of the storage section 11b from the upper end to the lower end, but the way the string member 741 is wrapped is different. In the tissue retrieval device 7-2, one end of the string member 741 is fixed at point 744 on the upper end side, and the string member 741 is wound around the outer circumference of the storage section 11b from the upper end side to the lower end side, but the winding direction is reversed along the way. More specifically, the winding direction of the string member 741 is reversed at insertion sections 741a and 741b, which are fixed to the storage section 11b and allow the string member 741 to slide through in the vertical direction. In addition, the string member 741 that comes out of insertion section 741c provided on the lower end side is pulled out from the upper end side of the storage section 11b. As is clear from the example in Figure 18, a string insertion member that covers the entire outside of the storage section 11b, as shown in Figures 14 and 17, is not necessarily required. A member that can appropriately maintain the position of the string member 741 is sufficient. However, by providing a strip-shaped string insertion member as shown in Figures 14 and 17, it is possible to prevent the pressure on the storage section 11b caused by tightening with the string member from becoming localized.

[0089] <Embodiment 8> Figure 19 is a conceptual diagram showing the tissue recovery device 8 of Embodiment 8. The tissue recovery device 8 is similar to Embodiment 7 in that a flexible, elongated member is wrapped around the outer circumference of the storage section from the upper end to the lower end, thereby gradually reducing the internal volume of the storage section from the lower end towards the upper end and moving the recovered tissue inside the storage section to the upper side. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0090] In the tissue retrieval device 8, the directional volume reduction section is composed of a flexible, elongated member (a string member 841 in this embodiment) that is directly or indirectly fixed to a point 844 where the middle section is at the upper end. The string member 841 is wound around the outer circumference of the storage section 11b from the upper end to the lower end, and both ends 846-1 and 846-2 of the string member 841 are pulled out towards the upper end of the storage section 11b. Although not shown in the illustration, string insertion members and the like are provided as appropriate to maintain the arrangement of the string member 841.

[0091] The tissue recovery device 8 of this embodiment can achieve the same effects and advantages as in the embodiment 7. In addition, as in Embodiment 7, any flexible member, such as a band or belt, can be used as the flexible elongated member, and the number of times it is wound can be increased or decreased.

[0092] Multiple flexible elongated members may be provided, in which case the ends of the flexible elongated members that are pulled out toward the upper end should be arranged symmetrically on the outer circumference of the opening 12. Figure 20 is a conceptual diagram showing such a tissue retrieval device 8-1 as viewed from above. The tissue retrieval device 8-1 includes a string member 841a having the same configuration as the string member 841 described above for the tissue retrieval device 8, and also includes a string member 841b having the same configuration as the string member 841, but positioned 180° rotated relative to the string member 841a. With this configuration, as shown in Figure 20, both ends 846-1a and 846-2a of the string member 841a and both ends 846-1b and 846-2b of the string member 841b are arranged symmetrically on the outer circumference of the opening 12. The tissue retrieval device 8-1 is preferable because, since the ends of the multiple string members are arranged symmetrically on the outer circumference of the opening, the force applied to the tissue retrieval device when the string members are pulled can be equalized.

[0093] <Embodiment 9> Figure 21 is a conceptual diagram showing the tissue recovery device 9 of Embodiment 9. The tissue retrieval device 9 includes a flexible, elongated member (string members 941a, 941b in this embodiment) whose middle portion is directly or indirectly fixed to the storage section 11b, which is wound around the outer circumference of the storage section 11b, and whose ends are pulled out toward the upper end. The string members 941a, 941b are arranged in order from the lower end to the upper end. This configuration constitutes a directional volume reduction section. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0094] The string members 941a and 941b are conceptually the same as the string member 841 of Embodiment 8, and are each wrapped around the outer circumference of the storage section 11b from the upper end to the lower end, with both ends 946-1a, 946-2a and both ends 946-1b, 946-2b being pulled out towards the upper end of the storage section 11b. Although not shown in the illustration, string insertion members and the like are provided as appropriate to maintain the arrangement of each string member.

[0095] In the tissue retrieval device 9, by first pulling both ends 946-1b and 946-2b of the lower string member 941b, and then pulling both ends 946-1b and 946-2b of the upper string member 941a, the internal volume of the storage section 11b is gradually reduced from the lower end to the upper end, thereby moving the retrieved tissue inside the storage section 11b towards the upper side. In addition, as in Embodiment 7, any flexible member, such as a band or belt, can be used as the flexible elongated member, and the number of times it is wound can be increased or decreased. Furthermore, while this example uses two layers of flexible, elongated members arranged vertically, it is certainly possible to use three or more layers.

[0096] In this embodiment, the flexible elongated members arranged in the vertical direction are of the same concept as the string member 841 in Embodiment 8, but any flexible elongated members described in Embodiment 7 and later can be arbitrarily combined and arranged in the vertical direction.

[0097] Furthermore, as explained in Figure 20, multiple flexible elongated members may be arranged so that their ends are symmetrically positioned on the outer circumference of the opening.

[0098] <Embodiment 10> Figure 22 is a conceptual diagram showing the tissue recovery device 10 of Embodiment 10. The tissue retrieval device 10 includes a flexible, elongated member (in this embodiment, string members 1041a, 1041b, 1041c) whose one end is directly or indirectly fixed to the storage section 11b and which is wound around the outer circumference of the storage section 11b. Multiple string members 1041a, 1041b, and 1041c are arranged sequentially from the lower end to the upper end of the storage section 11b.

[0099] The lowest end of the string member 1041a has one end fixed to the storage section 11b at point 1044a, is wound around the storage section 11b, and the other end is pulled out towards the upper end of the storage section 11b. Furthermore, the locking portion 1047a is fixed to the string member 1041a at a position above the winding position of the string member 1041c, which is the uppermost end.

[0100] One end of the string member 1041b is fixed to the storage section 11b at point 1044b, and after being wound around the storage section 11b, the other end is engaged with the string member 1041a such that it can slide a predetermined distance but cannot slide beyond that distance. More specifically, a ring member 1048b is formed at the other end of the string member 1041b, and the string member 1041a is inserted through the ring member 1048b. The inner diameter of the ring member 1048b is greater than or equal to the diameter of the string member 1041a, and smaller than the outer diameter of the locking portion 1047a. That is, the string member 1041a can slide relative to the ring member 1048b, but the locking portion 1047a cannot pass through, thereby engaging the other end of the string member 1041b so that it can slide relative to the string member 1041a for a predetermined distance and cannot slide beyond that distance.

[0101] The upper part of the string member 1041b, the string member 1041c, has one end fixed to the storage section 11b at point 1044c, and is wound around the storage section 11b. The other end is engaged with the string member 1041a such that it can slide a predetermined distance but cannot slide beyond that distance. More specifically, a ring member 1048c is formed at the other end of the string member 1041c, and the string member 1041a is inserted through the ring member 1048c. The inner diameter of the ring member 1048c is greater than or equal to the diameter of the string member 1041a, and smaller than the outer diameter of the locking portion 1047a (or ring member 1048b). That is, the string member 1041a can slide relative to the ring member 1048c, but the locking portion 1047a (or ring member 1048b) cannot pass through, thereby engaging the other end of the string member 1041c so that it can slide relative to the string member 1041a for a predetermined distance and cannot slide beyond that distance.

[0102] The sliding distance L1 of the flexible elongated member 1041a is longer than the sliding distance L2 of the flexible elongated member 1041b. The sliding distance L2 of the flexible elongated member 1041b is longer than the sliding distance L3 of the flexible elongated member 1041c. Although not shown in the illustration, string insertion members and the like are provided as appropriate to maintain the arrangement of each string member.

[0103] The tissue recovery device 10 of this embodiment has a directional volume reduction section formed by the configuration described above. Note that the same reference numerals are used for components similar to those in Embodiment 1, and their descriptions here are simplified or omitted.

[0104] When the tissue retrieval device 10 pulls the other end of the string member 1041a that is pulled out towards the upper end of the storage section 11b, the diameter of the string member 1041a wrapped around the storage section 11b first decreases, and the storage section 11b is tightened at that point. At this time, as the string member 1041a is pulled, the locking part 1047a also moves upward, but no tensile force is generated in the string members 1041b and 1041c unless the locking part 1047a comes into contact with the ring members 1048b and 1048c. Subsequently, when the locking portion 1047a comes into contact with the ring member 1048b, the ring member 1048b is also pulled upwards. This reduces the diameter of the string member 1041b wrapped around the storage portion 11b, tightening the storage portion 11b in that area. Furthermore, when the locking portion 1047a (or ring member 1048b) comes into contact with the ring member 1048c, the ring member 1048c is also pulled upwards. This reduces the diameter of the string member 1041c wrapped around the storage portion 11b, tightening the storage portion 11b in that area.

[0105] As can be understood from the above explanation, the tissue recovery device 10 allows the internal volume of the storage section 11b to be gradually reduced from the lower end to the upper end, thereby moving the recovered tissue inside the storage section 11b to the upper side. As with Embodiment 7, any flexible, elongated member can be used as the flexible member, such as a band or belt. Furthermore, while this example uses three tiers of flexible, elongated members arranged vertically, it is of course possible to use two or four or more tiers.

[0106] <Embodiment 11> Figure 23 is a cross-sectional view of the tissue retrieval device 15 of Embodiment 11. Figure 24 is an explanatory diagram illustrating the operation of the tissue retrieval device 15. The tissue recovery device 15 of this embodiment includes partially variable volume members 154-1 and 154-2, whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section 11b. These partially variable volume members 154-1 and 154-2 are located at the lower end of the storage section 11b. The medium introduction section 131 and hand pump 132 for introducing the introduction medium are based on the same concepts as in Embodiment 1, etc. (The same reference numerals are used for components similar to those in Embodiment 1, and their explanations here are simplified or omitted.)

[0107] Since the partially variable volume members 154-1 and 154-2 have basically the same configuration (a symmetrical configuration), the partially variable volume member 154-1 will be described primarily here. The partially variable volume member 154-1 is positioned at the lower end of the storage section 11b, along the inner circumferential surface of the storage section 11b. In this embodiment, the partially variable volume member 154-1 extends over approximately half of the inner circumference of the storage section 11b in a cross-sectional view substantially perpendicular to the axis extending from the upper end to the lower end (the partially variable volume member 154-2 is located in the remaining half-circumferential portion). Furthermore, as shown in Figure 24, the vertical length L1 of the partially variable volume members 154-1 and 2 is shorter than the maximum dimension L2 of the recovered tissue Sp that is expected to be recovered by the tissue recovery device 15. Also, the vertical length L1 of the partially variable volume members 154-1 and 2 is 4 / 5 or less (for example, 2 / 3 or less, or 1 / 2 or less, or 1 / 3 or less) of the vertical length L3 of the storage section 11b. As shown in Figure 24, the partially variable volume members 154-1 and 154-2 are mainly located on the lower side with respect to the recovered tissue Sp contained in the storage section 11b. The term "recovered tissue that is expected to be recovered by the tissue recovery device" is determined appropriately based on the specifications and design philosophy of each tissue recovery device at the time of commercialization. With the tissue recovery device 15 having the above configuration, as shown in Figure 24, when the introduction medium is introduced, the volume of the partially variable volume members 154-1 and 154-2 increases, and the internal volume of the storage section 11b (the space in which the recovered tissue Sp can exist) decreases. As a result, the recovered tissue Sp is squeezed upwards and moves towards the top.

[0108] As described above, the tissue recovery device 15 of this embodiment can provide the same effects and advantages as in Embodiment 1. The partially variable volume member may be formed from any stretchable or non-stretchable member, as is the case in Embodiment 1. Furthermore, it is also possible to increase or decrease the number of divisions of the partially variable volume member (the number of divisions in a cross-sectional view substantially perpendicular to the axis extending from the upper end to the lower end (2 in this embodiment)). When dividing the partially variable volume member, it is not necessarily required to provide the partially variable volume member continuously around the entire inner surface of the storage section 11b; for example, it may be arranged intermittently. In addition, the partially variable volume member and the storage section may be formed separately and then combined (e.g., glued together), or they may be formed integrally (for example, the partially variable volume member may be integrally formed as part of the storage section).

[0109] Furthermore, the method for introducing the medium into the partially variable volume member can be either manual or automatic, and in the case of automatic introduction, it may be based on flow rate control or pressure control, as in Embodiment 5. In this embodiment, the introduction medium is introduced to the partially variable volume members 154-1 and 154-2 by an introduction section branched from a common medium introduction section 131. However, the introduction medium may be introduced to each individually.

[0110] As described above in each embodiment, the tissue recovery device of each embodiment includes a directional volume reduction unit that moves the recovered tissue towards the opening, making it possible to remove the recovered tissue from the body more easily and reliably. For example, when removing a lung lobe using thoracoscopic surgery, it is sometimes necessary to pull out a tissue retrieval bag containing the lung lobe from between the ribs. However, the bag can get stuck in the ribs and become difficult to remove, and the intercostal nerves can be compressed during this process. Compression of the intercostal nerves during surgery can cause postoperative pain, increasing the burden on the patient. The tissue recovery device of each embodiment is extremely useful because it allows the recovered tissue in the storage compartment to be moved upwards and removed, thereby mitigating such problems.

[0111] Furthermore, in each embodiment of the tissue retrieval device, a marking may be provided to indicate the insertion position into the body when inserting the tissue retrieval device into the body. For example, a mark M may be placed at the location indicated by the arrow in Figure 24 to serve as a marker for the position that should be kept above the body surface S. The mark M can be any notation that functions as an indicator, such as a reference line, arrow, or text, or it may be indicated by color coding (for example, changing the color above and below the position of M). Alternatively, it may be an indicator that shows steps (for example, multiple reference lines or markings). In addition, an indicator may be provided to show the location where the variable volume member is formed. As described in each of the embodiments above, the variable volume member increases in volume, and it is preferable to avoid placing it in the location of the incision. This is to reduce the effect of the variable volume member expanding the incision when it expands. Therefore, an indicator may be provided that allows the location and range where the variable volume member is formed to be easily recognized from the outside (for example, a warning indicator such as "Always insert it into the body up to this position").

[0112] In the tissue retrieval device of each embodiment, the length of the storage section in the vertical direction (from one end to the other) (for example, length L3 in Figure 24) is preferably 25 cm or less, and more preferably 20 cm or less, considering the limitations of space within the thoracic cavity. Furthermore, the length of the directional volume reduction section (or partially variable volume member) in the vertical direction (from one end to the other) is preferably 1 / 3 to 4 / 5 of the length of the storage section in the vertical direction (from one end to the other) (for example, length L3 in Figure 24).

[0113] Furthermore, a mechanism may be provided in which a string is placed along the edge of the opening of the storage compartment, and when the string is pulled, the opening closes in a drawstring manner. In this case, a limiting member (a predetermined opening maintenance member) may be provided to prevent the opening from falling below a certain size. For example, a stopper may be placed in the middle of the string, or at any point on the edge of the storage compartment (opening) where the string is placed, to physically prevent the string from being pulled beyond a certain point. Alternatively, a ring-shaped component may be placed in the opening to prevent it from falling below a certain size. [Explanation of symbols]

[0114] 1...Tissue recovery equipment 11a...Outer restraint body 11b...Storage section 12...Opening 131...Media introduction part 14...Directional volume reduction section 141a~141f...Partially variable volume member 142...Communication section (medium movement resistance section) 341...Tubular spiral member 44-1~44-3...Directional volume reduction section (tubular variable volume member) 741... String member (flexible elongated member) S...Body surface Sp...Recovery Organization 100...Conventional (Patent Document 1) tissue recovery bag 110...Inner bag of conventional tissue recovery bag (Patent Document 1) 140...Outer bag of conventional tissue recovery bag (Patent Document 1) 150...Space in a conventional tissue collection bag (Patent Document 1) F... Fluid introduced into a conventional tissue recovery bag (Patent Document 1)

Claims

1. A tissue retrieval device for removing retrieved tissue from inside the body to outside the body, A storage section having an opening at one end and containing the recovered tissue inside, A directional volume reduction unit that reduces the internal volume of the storage unit from the other end to the one end, thereby moving the recovered tissue from the other end to the one end, A tissue recovery device equipped with the following features.

2. The directional volume reduction section is A variable volume member whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section, A media introduction section for introducing the introduction medium from the other end of the variable volume member, Equipped with, The tissue recovery device according to claim 1, wherein the variable volume member has a medium movement resistance portion that generates resistance to the movement of the introduced medium introduced inside from the other end to the one end.

3. The tissue recovery device according to claim 2, wherein the variable volume member comprises a plurality of partially variable volume members arranged sequentially from the other end to the one end of the storage portion.

4. The tissue recovery device according to claim 3, wherein a communication section is provided to connect a plurality of the partially variable volume members, and the communication section restricts the movement of the introduced medium, thereby constituting the medium movement resistance section.

5. The tissue recovery device according to claim 3, wherein the medium movement resistance portion is configured by the partial variable volume member being formed by an expandable / contractible member.

6. The tissue recovery device according to claim 3, wherein the partially variable volume member is an annular member along the outer circumference of the storage portion in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

7. The tissue recovery device according to claim 3, wherein the partially variable volume member is divided into multiple parts in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

8. The tissue recovery device according to claim 2, wherein the variable volume member is composed of a tubular spiral member arranged spirally from the other end to the one end, and the medium movement resistance portion is configured based on the friction loss caused by the tubular member.

9. The tissue recovery device according to claim 8, wherein the friction loss is increased because the tubular spiral member is formed by an expandable member.

10. The tissue recovery device according to claim 8, wherein the tubular spiral member is provided with a valve that generates resistance to the movement of the introduced medium.

11. The tissue recovery device according to claim 2, wherein the variable volume member is composed of a tubular variable volume member arranged to extend from the other end to the one end, and the medium movement resistance portion is configured based on the friction loss caused by the tubular member.

12. The tissue recovery device according to claim 11, wherein a plurality of the tubular variable volume members are arranged.

13. The tissue recovery device according to claim 12, further comprising a media introduction section for independently introducing the introduction medium to each of the multiple tubular variable volume members.

14. The tissue recovery device according to claim 11, wherein the friction loss is increased because the tubular variable volume member is formed by an expandable member.

15. The tissue recovery device according to claim 11, wherein the tubular variable volume member is provided with a valve that generates resistance to the movement of the introduced medium.

16. The directional volume reduction section includes a partially variable volume member whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section. Multiple of the aforementioned partially variable volume members are arranged sequentially from the other end to the one end of the storage section. The tissue recovery device according to claim 1, further comprising a media introduction unit for introducing the introduction medium individually to each of the multiple partially variable volume members.

17. The tissue recovery device according to claim 16, wherein the medium introduction unit introduces the introduction medium into the partially variable volume member sequentially from the other end to the one end.

18. The tissue recovery device according to claim 16, wherein the amount of the introduction medium introduced per unit time into the partially variable volume member is greater at the other end than at the one end.

19. The tissue recovery device according to claim 16, wherein the partially variable volume member is an annular member along the outer circumference of the storage portion in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

20. The tissue recovery device according to claim 16, wherein the partially variable volume member is divided into multiple parts in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

21. The tissue recovery device according to claim 16, wherein the partially variable volume member is formed by an expandable member.

22. The directional volume reduction section includes a partially variable volume member whose volume increases when an introduction medium is introduced inside, thereby reducing the internal volume of the storage section. The tissue recovery device according to claim 1, wherein at least one of the partially variable volume members is arranged on the other end side of the storage portion, and the length of the partially variable volume member in the direction from one end to the other end is 4 / 5 or less of the length of the storage portion in the direction from one end to the other end.

23. The tissue recovery device according to claim 22, wherein the partially variable volume member is divided into multiple parts in a cross-sectional view substantially perpendicular to the axis extending from the other end to the one end of the storage portion.

24. The directional volume reduction section is composed of a flexible, elongated member that is slidably wound around the outer circumference of the storage section. The tissue retrieval device according to claim 1, wherein one end of the flexible elongated member is directly or indirectly fixed to the location on the one end side of the storage portion, the flexible elongated member is wound around the outer circumference of the storage portion from the one end side to the other end side, and the other end of the flexible elongated member is pulled out toward the one end side of the storage portion.

25. The tissue recovery device according to claim 24, wherein a plurality of the aforementioned flexible elongated members are arranged.

26. The tissue recovery device according to claim 25, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

27. The directional volume reduction section is composed of a flexible, elongated member that is slidably wound around the outer circumference of the storage section. The tissue recovery device according to claim 1, wherein the middle portion of the flexible elongated member is directly or indirectly fixed to the location that will be one end of the storage portion, the flexible elongated member is wound around the outer circumference of the storage portion from one end to the other end, and both ends of the flexible elongated member are pulled out toward the one end of the storage portion.

28. The tissue recovery device according to claim 27, wherein a plurality of the aforementioned flexible elongated members are arranged.

29. The tissue recovery device according to claim 28, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

30. The directional volume reduction section is The flexible, elongated member comprises one end which is directly or indirectly fixed to the storage portion, wrapped around the outer circumference of the storage portion, and the other end which is pulled out toward the one end of the storage portion. The tissue recovery device according to claim 1, wherein a plurality of the flexible elongated members are arranged sequentially from the other end to the one end of the storage section.

31. The tissue recovery device according to claim 30, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

32. The directional volume reduction section is The flexible, elongated member comprises a middle portion which is directly or indirectly fixed to the storage portion, is wrapped around the outer circumference of the storage portion, and both ends which are pulled out toward one end of the storage portion. The tissue recovery device according to claim 1, wherein a plurality of the flexible elongated members are arranged sequentially from the other end to the one end of the storage section.

33. The tissue recovery device according to claim 32, wherein the ends of the plurality of flexible elongated members, which are drawn out toward one end, are symmetrically arranged on the outer circumference of the opening.

34. The directional volume reduction portion comprises a flexible, elongated member, one end of which is directly or indirectly fixed to the storage portion and which is wrapped around the outer circumference of the storage portion. Multiple of the aforementioned flexible elongated members are arranged sequentially from the other end to the one end of the storage section. The other end of the flexible elongated member, which is positioned closest to the other end of the storage section, is pulled out toward the one end of the storage section. The tissue recovery device according to claim 1, wherein the other end of one of the flexible elongated members is engaged with the flexible elongated member that is pulled out toward one end of the storage section such that it can slide a predetermined distance and cannot slide beyond that distance, and the sliding distance of each of the flexible elongated members is longer for the flexible elongated member located toward the other end of the storage section than for the flexible elongated member located toward the one end of the storage section.

35. The tissue recovery device according to any one of claims 1 to 23, wherein at least a part of the storage section is composed of the directional volume reduction section.

36. A tissue recovery device according to any one of claims 1 to 23, further comprising an external restraining body for suppressing an increase in the external volume of the directional volume reduction section.

37. The tissue recovery device according to any one of claims 1 to 34, wherein the cross-sectional area of ​​the storage section, which is substantially perpendicular to the axis extending from one end to the other end, decreases as it moves from one end to the other end.

38. A tissue retrieval device according to any one of claims 1 to 34, further comprising an indicator for the insertion position into the body when at least a portion of the tissue retrieval device is inserted into the body.

39. The tissue recovery device according to any one of claims 1 to 34, wherein the length of the storage section in the direction from one end to the other end is 25 cm or less.

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