Endoscopic devices and balloons

Abstract

The present invention provides an endoscope device and a balloon that can reduce the diameter of the mounting portion when the balloon is mounted on the insertion portion of an endoscope. The endoscope device (1) comprises: an endoscope (10) having an insertion portion (12); and a balloon (60) mounted on the insertion portion (12). The balloon (60) comprises a first barrel (60A), a second barrel (60B) and a balloon body (60C). In the pre-mounted state before the balloon (60) is mounted on the insertion portion (12), the inner diameter of the first barrel (60A) is greater than 1 / 10 and less than 1 / 2 of the outer diameter of the insertion portion. The inner diameter of the second barrel (60B) can be set to greater than 1 / 10 and less than 1 / 2 of the outer diameter of the insertion portion (12). Furthermore, the inner diameter of the second tube portion (60B) can be set to be greater than 1 / 2 of the outer diameter of the insertion portion (12) and smaller than the outer diameter of the insertion portion (12), so that the axial length of the second tube portion (60B) of the balloon (60) is longer than that of the first tube portion (60A).

Description

Technical Field

[0001] The present invention relates to an endoscope device and a balloon, and in particular to an endoscope device having a balloon installed at an insertion portion of an endoscope and the balloon. Background Art

[0002] In an endoscope device, an inflatable and deflated balloon is used for various purposes. For example, in an endoscope device for observing a deep digestive tract such as the small intestine or the large intestine, an inflatable and deflated balloon is installed at the insertion portion of the endoscope, and the insertion portion of the endoscope can be fixed in the body by inflating the balloon.

[0003] This balloon is made of an elastic body such as rubber, and its end is formed into a cylindrical shape with a diameter smaller than the outer diameter of the object to be installed (the insertion part of the endoscope) in a natural state. In addition, when installing the balloon, the end of the balloon is expanded and placed on the object to be installed, and then a wire is wound from above the end of the balloon or a rubber band is inserted outside, thereby fixing the end of the balloon to the object to be installed.

[0004] As another method for attaching the balloon to the attachment portion, for example, the following patent document 1 describes that a balloon whose two ends are made of a rubber material with a higher hardness than the central portion is used, the balloon is attached to the insertion portion of the endoscope at the high hardness portion of the balloon, and only the central portion is inflated. Patent document 2 describes that after attaching the cylindrical portion of the balloon end to the insertion portion of the endoscope, the sealed chamber formed between the insertion portion and the cylindrical portion is depressurized to adsorb the balloon to the endoscope, thereby attaching the balloon.

[0005] Patent Document 3 describes an endoscope device in which the end of a balloon unit is formed of a hard cylindrical body, and the cylindrical body has a fall-off prevention ring as a fall-off prevention mechanism for preventing the balloon unit from falling off from an insertion portion of an endoscope.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-118375

[0007] Patent Document 2: Japanese Patent Application Publication No. 2009-160094

[0008] Patent Document 3: Japanese Patent Application Publication No. 2008-006000

[0009] The balloon described in Patent Document 1 has a problem of being difficult to manufacture because it requires a change in the material structure. Furthermore, the inflation of the balloon requires an additional force to stretch the carcass, and the inflation of the balloon takes time.

[0010] The balloon described in Patent Document 2 is difficult to achieve a small size of the portion that maintains decompression, and in the balloon described in Patent Document 3, the diameter of the insertion portion when the balloon is installed will also be thickened by the amount corresponding to the installation portion of the anti-drop ring. If the diameter of the front end of the endoscope is thickened, it will be difficult to pass through the narrow part and adhesion part of the intestine. In addition, even if it is desired to leave only the outer tube in the body and only remove the endoscope for treatment, if the diameter of the insertion portion is thick, it is impossible to pass the insertion portion through the outer tube and remove the endoscope. Summary of the invention

[0011] The present invention has been made in view of such circumstances, and an object of the present invention is to provide an endoscope device and a balloon capable of reducing the diameter of a mounting portion when the balloon is mounted on an insertion portion of an endoscope.

[0012] In order to achieve the purpose of the present invention, the endoscope device involved in the present invention comprises: an endoscope, which has an insertion part; and a balloon, which is installed in the insertion part, wherein, in a pre-installation state before the balloon is installed in the insertion part, the thickness of the balloon is a uniform wall thickness and a uniform hardness, and the balloon comprises: a first barrel, which is arranged at one end of the balloon and installed at a first position on the front end side of the insertion part; a second barrel, which is arranged at the other end of the balloon and installed at a second position on the base end side of the insertion part than the first position; and a balloon body, which is arranged between the first barrel and the second barrel, and in the pre-installation state, the inner diameter of the first barrel is greater than 1 / 10 and less than 1 / 2 of the outer diameter of the insertion part.

[0013] In order to achieve the purpose of the present invention, the endoscope device involved in the present invention comprises: an endoscope, which has an insertion part; and a balloon, which is installed in the insertion part, wherein, in a pre-installation state before the balloon is installed in the insertion part, the thickness of the balloon is a uniform wall thickness and a uniform hardness, and the balloon comprises: a first barrel, which is arranged at one end of the balloon and installed at a first position on the front end side of the insertion part; a second barrel, which is arranged at the other end of the balloon and installed at a second position on the base end side of the insertion part than the first position; and a balloon body, which is arranged between the first barrel and the second barrel, and the Young's modulus of the material of the balloon is set to E, and the unit of E is MPa, and the inner diameter of the insertion part is set to D, and the unit of D is mm. In the pre-installation state, the inner diameter of the first barrel is set to d1(b), and the unit of d1(b) is mm, and the axial length of the first barrel is set to l1(b), and the unit of l1(b) is mm, and the wall thickness of the balloon is set to t, and the unit of t is mm, the following formula is satisfied.

[0014] [Mathematical expression 1]

[0015]

[0016] In order to achieve the purpose of the present invention, the balloon involved in the present invention is installed on the insertion part of an endoscope, wherein, in a pre-installation state before the balloon is installed in the insertion part, the thickness of the balloon is a uniform wall thickness and a uniform hardness, and the balloon comprises: a first barrel portion, which is arranged at one end of the balloon and installed at a first position on the front end side of the insertion part; a second barrel portion, which is arranged at the other end of the balloon and installed at a second position on the base end side of the insertion part than the first position; and a balloon body, which is arranged between the first barrel portion and the second barrel portion, and in the pre-installation state, the inner diameter of the first barrel portion is greater than 1 / 10 and less than 1 / 2 of the outer diameter of the insertion part.

[0017] In order to achieve the purpose of the present invention, the balloon involved in the present invention is installed on the insertion part of an endoscope, wherein, in a pre-installation state before the balloon is installed in the insertion part, the thickness of the balloon is a uniform wall thickness and a uniform hardness, and the balloon comprises: a first barrel portion, which is arranged at one end of the balloon and installed at a first position on the front end side of the insertion part; a second barrel portion, which is arranged at the other end of the balloon and installed at a second position on the base end side of the insertion part than the first position; and a balloon body, which is arranged between the first barrel portion and the second barrel portion, and in the pre-installation state, the inner diameter of the first barrel portion is greater than 1 / 25 and less than 1 / 10 of the maximum inner diameter of the balloon body.

[0018] In order to achieve the purpose of the present invention, the balloon involved in the present invention is installed on the insertion part of an endoscope, wherein, in a pre-installation state before the balloon is installed in the insertion part, the thickness of the balloon is a uniform wall thickness and a uniform hardness, and the balloon comprises: a first barrel, which is arranged at one end of the balloon and installed at a first position on the front end side of the insertion part; a second barrel, which is arranged at the other end of the balloon and installed at a second position on the base end side of the insertion part than the first position; and a balloon body, which is arranged between the first barrel and the second barrel, and the Young's modulus of the material of the balloon is set to E, and the unit of E is MPa, and the inner diameter of the insertion part is set to D, and the unit of D is mm. In the pre-installation state, the inner diameter of the first barrel is set to d1(b), and the unit of d1(b) is mm, and the axial length of the first barrel is set to l1(b), and the unit of l1(b) is mm, and the wall thickness of the balloon is set to t, and the unit of t is mm, then the following formula is satisfied.

[0019] [Mathematical expression 2]

[0020]

[0021] Effects of the Invention

[0022] According to the present invention, the first tube portion can be held and fixed to the insertion portion by the contraction force of the first tube portion expanded by the insertion of the insertion portion. Thus, the distal end of the insertion portion of the endoscope after the balloon is attached can be reduced in diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a system configuration diagram of an endoscope device using a balloon.

[0024] Figure 2 It is a perspective view showing the front end portion of the insertion portion of the endoscope.

[0025] Figure 3 It is a cross-sectional view showing the structure of the balloon according to the first embodiment.

[0026] Figure 4 This is a diagram for explaining the principle of mounting by shrink fitting.

[0027] Figure 5 A cross-sectional view showing the structure of the balloon according to the second embodiment.

[0028] Figure 6 It is a cross-sectional view showing the structure of the balloon according to the third embodiment.

[0029] Figure 7 It is a diagram for explaining the mounting state of the balloon according to the third embodiment.

[0030] Figure 8 It is a perspective view showing an example of a balloon mounting device.

[0031] Fig. 9 This is a diagram for explaining a method of attaching a balloon to an insertion portion. DETAILED DESCRIPTION

[0032] Hereinafter, the endoscope device and the balloon according to the present invention will be described with reference to the drawings.

[0033] Figure 1 FIG. 1 is a system configuration diagram showing an example of an endoscope device according to the present invention. Figure 1 As shown, the endoscope device 1 is mainly composed of an endoscope 10 and a balloon 60. In addition, the endoscope device 1 may include a balloon control device 70.

[0034] The endoscope 10 includes an operation portion 14 and an insertion portion 12 connected to the operation portion 14 and inserted into the body. A universal cord 16 is connected to the operation portion 14, and an LG connector 18 is provided at the front end of the universal cord 16. The LG connector 18 is detachably connected to a light source device 20, thereby transmitting illumination light to an illumination window (not shown) provided at the front end of the insertion portion 12. In addition, an electric connector 24 is connected to the LG connector 18 via a cable 22, and the electric connector 24 is detachably connected to a processor 26.

[0035] The operation portion 14 includes an air and water supply button 28 , a suction button 30 , a shutter button 32 , and a function switching button 34 , and also includes a pair of angle buttons 36 , 36 .

[0036] The insertion portion 12 is composed of a soft portion 40, a curved portion 42, and a distal end portion 44 in order from the operation portion 14. The soft portion 40 is formed by wrapping a mesh around the outer periphery of a spirally wound metal plate to cover the outer periphery, and has sufficient flexibility.

[0037] The bending portion 42 is configured to be remotely bent by rotating the angle knobs 36, 36 of the operating portion 14. For example, the bending portion 42 is connected to a plurality of cylindrical node rings by a pin so as to be freely rotatable, and a plurality of operating wires are inserted into the inside of the node rings and guided to the pins. Moreover, by pushing and pulling the operating wires, the node rings are rotated with each other, so that the bending portion 42 is bent. By bending the bending portion 42, the front end portion 44 can be directed to a desired direction.

[0038] like Figure 2 As shown, an observation window 52, ​​lighting windows 54, 54, air and water supply nozzles 56, and a forceps mouth 58 are provided on the front end surface 45 of the front end portion 44. An observation optical system and an imaging element such as CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge Coupled Device) are arranged behind the observation window 52, ​​and a signal cable is connected to the substrate supporting the imaging element. The signal cable is inserted through the insertion portion 12, the operation portion 14, and the universal cord 16, etc., and is extended to the electrical connector 24, and is connected to the processor 26. Therefore, the observation image read from the observation window 52 is imaged on the light receiving surface of the imaging element and converted into an electrical signal, which is output to the processor 26 via the signal cable and converted into a video signal. As a result, the observation image is displayed on the monitor 50 connected to the processor 26.

[0039] The illumination window 54 is provided with an illumination optical system and an exit end of a light guide (not shown) at its rear. The light guide penetrates the insertion portion 12, the operation portion 14 and the universal cord 16, and its entrance end is provided in the LG connector 18. Therefore, by connecting the LG connector 18 to the light source device 20, the illumination light emitted from the light source device 20 is transmitted to the illumination optical system via the light guide, and is emitted forward from the illumination window 54.

[0040] The air supply and water supply nozzle 56 provided at the front end portion 44 is communicated with a valve (not shown) operated by the air supply and water supply button 28. The valve is communicated with the air supply and water supply connector 48 provided at the LG connector 18. An air supply and water supply mechanism (not shown) is connected to the air supply and water supply connector 48, which supplies air and water. Therefore, by operating the air supply and water supply button 28, air or water is sprayed from the air supply and water supply nozzle 56 toward the observation window 52.

[0041] The forceps opening 58 provided at the front end portion 44 is communicated with the forceps insertion portion 46. Therefore, by inserting a treatment tool such as forceps from the forceps insertion portion 46, the treatment tool can be led out from the forceps opening 58. In addition, the forceps opening 58 is communicated with a valve (not shown) operated by the suction button 30, and the valve is connected to the suction connector 49 of the LG connector 18. Therefore, by connecting a suction mechanism (not shown) to the suction connector 49 and operating it with the suction button 30, a lesion or the like can be suctioned from the forceps opening 58.

[0042] A balloon 60 is detachably mounted on the outer periphery of the insertion portion 12 of the endoscope 10. The balloon 60 is made of an elastic material such as silicone rubber. The balloon 60 has a first barrel 60A disposed at one end and mounted at a first position on the front end side of the insertion portion 12 of the endoscope 10, a second barrel 60B disposed at the other end and mounted at a second position closer to the base end side of the insertion portion 12 than the first position, and a balloon body 60C disposed between the first barrel 60A and the second barrel 60B, and the first barrel 60A and the second barrel 60B are formed into a substantially cylindrical shape that is reduced relative to the balloon body 60C.

[0043] The balloon 60 is arranged at a predetermined installation position (for example, from the front end portion 44 to the curved portion 42) by inserting the insertion portion 12. The first barrel 60A and the second barrel 60B are configured with an inner diameter smaller than the outer diameter of the insertion portion 12 of the endoscope 10 before installation. If the balloon 60 is installed in the insertion portion 12, the elastic force of the first barrel 60A and the elastic force of the second barrel 60B act toward the radial inner side of the insertion portion 12. That is, by being installed in the insertion portion 12, the expanded first barrel 60A and the second barrel 60B shrink in order to return to their original size. The balloon 60 is maintained at a predetermined position of the insertion portion 12 by the shrinkage force of the first barrel 60A and the second barrel 60B. In addition, details of the specific dimensions used to install the balloon 60 in the insertion portion 12 will be described later.

[0044] A vent hole 64 is formed at the balloon mounting position of the insertion portion 12. Figure 1 The balloon air supply port 38 of the operation part 14 shown in the figure is connected. Figure 1 The balloon 60 is provided with a hose 80, and a balloon control device 70 is connected via the hose 80. The balloon control device 70 is a device for supplying and sucking a fluid such as air to the balloon 60. By supplying or sucking a fluid (such as air) from the balloon control device 70, air can be supplied or sucked into the balloon 60. The balloon 60 is expanded into a substantially spherical shape by the supply of air, and is attached to the outer surface of the insertion portion 12 by the suction of air.

[0045] like Figure 1As shown, the balloon control device 70 is mainly composed of a device body 72 and a manual switch 74 for remote control. A power switch SW1, a stop switch SW2, and a pressure display unit 76 are provided on the front surface of the device body 72. The pressure display unit 76 is a panel that displays the pressure value of the balloon 60. When an abnormality such as balloon rupture occurs, an error code is displayed on the pressure display unit 76.

[0046] A hose 80 for supplying and sucking air to the balloon 60 is connected to the front surface of the device body 72. A backflow prevention unit 82 for preventing backflow of body fluid when the balloon 60 is damaged is provided at the connection portion between the hose 80 and the device body 72. The backflow prevention unit 82 is constructed by assembling a gas-liquid separation filter inside a hollow disc-shaped housing (not shown) that is detachably mounted on the device body 72, and the filter prevents liquid from flowing into the device body 72.

[0047] On the other hand, the manual switch 74 is provided with various switches. For example, a stop switch similar to the stop switch SW2 on the device body 72 side, an ON / OFF switch for instructing the pressurization and depressurization of the balloon 60, a pose switch for maintaining the pressure of the balloon 60, etc. are provided. The manual switch 74 is electrically connected to the device body 72 via a cord 84. Figure 1 Although not shown, the manual switch 74 is provided with a display unit indicating the inflation state or deflation state of the balloon 60 .

[0048] The balloon control device 70 supplies air to the balloon 60 to expand it, and controls the air pressure to a constant value to keep the balloon 60 in an expanded state. Also, air is sucked from the balloon 60 to deflate it, and controls the air pressure to a constant value to keep the balloon 60 in a deflated state.

[0049] The balloon control device 70 is connected to the balloon-dedicated monitor 86, and when the balloon 60 is inflated and deflated, the pressure value or the inflated and deflated state of the balloon 60 is displayed on the balloon-dedicated monitor 86. In addition, the pressure value or the inflated and deflated state of the balloon 60 may be superimposed on the observation image of the endoscope 10 and displayed on the monitor 50.

[0050] As an example of an operation method of an endoscope device, the insertion portion 12 is gradually inserted in a push manner, and the balloon 60 is inflated as needed to fix the insertion portion 12 in the body (e.g., the large intestine). It is generally performed under the air expansion pressure of the balloon 60 of about 5kPa or more and less than 10kPa. Moreover, after the insertion portion 12 is pulled out to simplify the tube shape in the body (e.g., the large intestine), the balloon 60 is contracted and the insertion portion 12 is further inserted into the deep part of the intestine. For example, the insertion portion 12 is inserted from the anus of the subject, and the balloon 60 is inflated when the front end of the insertion portion 12 passes through the sigmoid colon to fix the insertion portion 12 to the intestine, and the insertion portion 12 is pulled out to make the sigmoid colon roughly straight. Moreover, the balloon 60 is contracted and the front end of the insertion portion 12 is gradually inserted into the deep part of the intestine. Thus, the insertion portion 12 can be inserted into the deep part of the intestine. In addition, the above-mentioned endoscope 10 can be used together with an insertion auxiliary tool with a balloon (not shown) as a double-balloon endoscope device.

[0051] [Balloon]

[0052] (First embodiment)

[0053] Next, the balloon according to the present embodiment will be described. Figure 3 1 is a diagram showing the structure of the balloon 60 in the pre-installation state. In the pre-installation state before the balloon 60 is installed in the insertion portion 12, the thickness of the balloon 60 is a uniform wall thickness and is formed with a uniform hardness. In addition, the pre-installation state is a natural state before being installed in the insertion portion 12, which refers to a state in which no force is applied from elsewhere. In the pre-installation state, the first barrel 60A, the second barrel 60B and the balloon body 60C are in an unexpanded and uncontracted state. In order to make the balloon 60 have a uniform wall thickness and a uniform hardness, the balloon 60 can be formed as a whole by the same material, or the first barrel 60A, the second barrel 60B and the balloon body 60C can be formed by different materials.

[0054] Furthermore, in the state before being installed in the insertion part 12, the inner diameter d1(b) of the first barrel 60A is set to be greater than 1 / 10 and less than 1 / 2 of the outer diameter D of the insertion part 12. By setting the inner diameter d1(b) of the first barrel 60A within the above range relative to the outer diameter D of the insertion part 12, the first barrel 60A can be held and fixed to the insertion part 12 by utilizing the contraction force of the first barrel 60A of the balloon 60. In this way, by installing the balloon 60 in the insertion part 12 by utilizing the contraction force of the first barrel 60A, the outer diameter of the insertion part 12 after the balloon 60 is installed in the insertion part 12 can be reduced.

[0055] Furthermore, the Young's modulus of the material of the balloon 60 is set to E [MPa], the outer diameter of the insertion portion 12 is set to D [mm], and the inner diameter of the first tube 60A in the pre-installation state is set to d １(b) [mm], when the axial length of the first tube portion 60A is set to l1(b) [mm] and the wall thickness of the balloon 60 is set to t [mm], the first tube portion 60A of the balloon 60 satisfies the following formula (1).

[0056] [Mathematical expression 3]

[0057]

[0058] By designing the balloon 60 to satisfy the above formula (1), the balloon 60 can be installed in the insertion portion 12 with an optimal contraction force in consideration of the material and wall thickness t of the first tube 60A of the balloon 60. In addition, since the balloon 60 is installed by utilizing the contraction force of the first tube 60A, the outer diameter of the balloon 60 at the front end of the insertion portion 12 can be reduced after installation, so that it can easily pass through a stenosis in the body.

[0059] In addition, a vent hole 64 is provided on the front end side of the insertion portion 12 for supplying air for inflating the balloon 60 (see FIG. Figure 2 ), and in order to prevent the first barrel 60A from protruding from the front end side of the insertion portion 12, the axial length of the first barrel 60A is determined according to the size of the insertion portion 12 of the endoscope 10. Therefore, on the first barrel 60A side, by changing the inner diameter d1(b) [mm] of the first barrel 60A and the wall thickness t [mm] of the balloon 60, a holding force that enables the first barrel 60A to hold the balloon 60 can be obtained. Here, the holding force refers to the force of the first barrel 60A holding the insertion portion 12 by the contraction force of the first barrel 60A.

[0060] As a design satisfying the above formula (1), the axial length l1(b) of the first barrel 60A is set to 8 mm, the outer diameter D of the insertion portion 12 is set to 10 mm, the Young's modulus E of the material of the balloon 60 is set to 0.5 MPa, and the wall thickness t of the balloon 60 that can obtain the balloon holding force is shown as the inner diameter d1(b) of the first barrel 60A is changed as shown in the following Table 1.

[0061] [Table 1]

[0062] <![CDATA[d1(b)[mm]]]> 2.5 3 4 5 t[mm] 0.15 0.24 0.55 1.18

[0063] When the inner diameter d1 (b) of the first tube portion 60A of the balloon 60 is increased, a predetermined holding force can be obtained by increasing the wall thickness t of the balloon 60 .

[0064] Regarding the inner diameter d1(b) of the first tube portion 60A of the balloon 60, the smaller the inner diameter d1(b), the greater the gripping force becomes. Furthermore, the smaller the inner diameter d1(b), the greater the amount of stretching when installed in the insertion portion 12 of the endoscope 10 becomes, so the wall thickness of the balloon 60 can be thinner than the state before installation. In order to easily install the balloon 60 in the insertion portion 12 and to reduce the diameter of the front end of the insertion portion 12 after the balloon is installed, it is set to be greater than 1 / 10 and less than 1 / 2 relative to the outer diameter D of the insertion portion 12. That is, when the outer diameter D of the insertion portion 12 of the endoscope 10 is 10 mm, it is set to be greater than 1 mm and less than 5 mm. It is more preferably greater than 1 / 5 and less than 2 / 5 relative to the outer diameter D of the insertion portion 12, and when the outer diameter D of the insertion portion 12 of the endoscope 10 is 10 mm, it is greater than 2 mm and less than 4 mm. By setting the inner diameter d1 ( b ) of the first cylindrical portion 60A within the above range, the balloon 60 can be easily inserted into a jig in order to attach the balloon 60 to the insertion portion 12 .

[0065] Furthermore, in order to reduce the wall thickness of the balloon 60 when installed, the wall thickness t of the balloon 60 before installation is preferably set to 0.5 mm or less, and more preferably 0.2 mm or less.

[0066] Next, a method of deriving the above-mentioned formula (1) and a case where the first tube portion 60A can be fixed to the insertion portion 12 by the contraction force without using a fixing member by satisfying the above-mentioned formula (1) will be described.

[0067] The above equation (1) is obtained based on the calculation equation of shrink fit. In this embodiment, the balloon 60 is attached to the insertion portion 12 of the endoscope using contact pressure based on the elastic force of the material of the elastic body, that is, the material of the balloon 60, instead of heating and expanding the outer tube.

[0068] Figure 4 1 is a diagram illustrating the dimensions of the inner cylinder 92 and the outer cylinder 94 before shrink fitting and the shrink fitting pressure and shrink fitting amount after shrink fitting. Figure 4 As shown in the figure, if the inner and outer radii of the inner cylinder before shrink fitting are set to r a 、r b , set the inner and outer radii of the outer cylinder to r c 、r d , then the outer radius r of the inner cylinder after shrink fit b and the inner radius r of the outer cylinder c All become R. At this time, the external pressure p Q Acting on the inner cylinder 92 and the internal pressure p q Acting on the outer cylinder 94, a radial displacement u of the inner cylinder outer periphery and the outer cylinder inner periphery is generated as follows: b and u c .u b and u cIt can be expressed by the following formula.

[0069] u b =r b -R

[0070] u c =Rr c

[0071] Moreover, the difference between the outer diameter of the inner cylinder and the inner diameter of the outer cylinder is called the shrink fit amount (displacement of the inner cylinder and the outer cylinder), such as Figure 4 As shown, the shrink fit amount 6 becomes u b with u c =2 times the sum of the absolute values ​​of , so it can be expressed by the following formula. Wherein, E1 and v1 are the elastic modulus of the material of the inner tube, E2 and v2 are the elastic modulus of the material of the outer tube, E is the Young's modulus, and v represents the Poisson's ratio.

[0072] [Mathematical expression 4]

[0073]

[0074] If the above formula is applied to the present embodiment, the inner tube is considered to be the endoscope and the outer tube is considered to be the balloon small diameter portion (first tube portion 60A). Here, since the endoscope does not deform, if E1=∞ is assumed and the first term is ignored, the following formula can be derived.

[0075] [Mathematical expression 5]

[0076] If set to

[0077]

[0078]

[0079] Then it becomes

[0080]

[0081] Here, if the inner diameter of the first tube portion 60A is d (here, d is used for simplification), the inner radius r of the outer tube (first tube portion 60A) is c For r c =d / 2, r d To further add the wall thickness of the balloon 60, r d =t+d / 2, and substitute it. In order to simplify the notation, let E2=E and v2=v. The following equation is obtained.

[0082] [Mathematical expression 6]

[0083]

[0084] Here, compared with other terms, t2 It is so small that it can be ignored, so the following formula can be obtained.

[0085] [Mathematical expression 7]

[0086]

[0087] Furthermore, v is negligibly small compared to (t+D / 2) / t. Furthermore, the radial displacement 6 of the balloon 60 is δ=Dd, which is obtained by subtracting the inner diameter d of the first tube 60A of the balloon 60 before installation from the outer diameter D of the endoscope.

[0088] Based on the above, the following formula can be obtained.

[0089] [Mathematical expression 8]

[0090]

[0091] Furthermore, since the above formula is the force per unit axial length, the contact pressure over the axial length of the first tube portion 60A can be obtained by multiplying it by the axial length l(b) (assuming that d=d(b)).

[0092] [Mathematical expression 9]

[0093]

[0094] P in the above equation is the contact pressure of the first tube 60A. By designing the first tube 60A of the balloon 60 so that the value of P satisfies P ≥ 1.6E, the balloon 60 can be attached to the insertion portion 12 using the contraction force of the first tube 60A.

[0095] Silicon rubber, latex rubber, IR rubber (polyisoprenerubber), etc. can be preferably used as the material for the balloon 60. As the Young's modulus of the material, for example, the Young's modulus E of latex rubber is 0.5 to 1 MPa, and the Young's modulus E of silicone rubber is 5 to 50 MPa.

[0096] And, in Figure 3 In the balloon 60 of the first embodiment shown, the inner diameter d2(b) of the second barrel 60B is also set to be greater than 1 / 10 and less than 1 / 2 of the outer diameter D of the insertion portion 12. By setting the inner diameter d2(b) of the second barrel 60B within the above range relative to the outer diameter D of the insertion portion 12, the second barrel 60B can be held and fixed to the insertion portion 12 by utilizing the contraction force of the second barrel 60B.

[0097] By setting the inner diameters d1(b) and d2(b) of the first barrel 60A and the second barrel 60B to be 1 / 10 or more and 1 / 2 or less relative to the outer diameter D of the insertion portion 12, the diameters of the insertion portion 12 on the first barrel 60A side and the second barrel 60B side of the balloon 60 can be made thinner even after the balloon 60 is installed. Therefore, when the insertion portion 12 of the endoscope 10 is inserted into the body, it is easy to pass over the stenosis, and the endoscope 10 can also be removed through the outer tube.

[0098] Furthermore, the maximum inner diameter d3 of the balloon body 60C and the intestinal diameter are preferably set to be greater than 25 mm and less than 50 mm. Furthermore, the endoscope 10 generally uses an endoscope whose outer diameter D of the front end of the insertion portion 12 is about 10 mm. As described above, when the balloon 60 is held and fixed to the insertion portion 12 by the telescopic force of the first barrel 60A, it is preferably set to be greater than 1 / 10 and less than 1 / 2 relative to the outer diameter D of the insertion portion 12, that is, when the outer diameter D is 10 mm, it is preferably set to be greater than 1 mm and less than 5 mm.

[0099] Therefore, if the inner diameter of the balloon body 60C is set to be greater than 25 mm and less than 50 mm and the inner diameter of the first barrel 60A is set to be greater than 1 mm and less than 5 mm, the inner diameter d1(b) of the first barrel 60A is preferably greater than 1 / 25 and less than 1 / 10 relative to the maximum inner diameter d3 of the balloon body 60C. By setting the inner diameter d1(b) of the first barrel 60A within the above range, the first barrel 60A can be gripped and fixed to the insertion portion 12 of the endoscope.

[0100] Similarly, it is preferred that the inner diameter d2(b) of the second barrel 60B is set to be greater than 1 / 25 and less than 1 / 10 relative to the maximum inner diameter d3 of the balloon body 60C. By setting the inner diameter d2(b) of the second barrel relative to the maximum inner diameter d3 of the balloon body 60C within the above range, the second barrel 60B can be gripped and fixed to the insertion portion 12 of the endoscope.

[0101] (Second embodiment)

[0102] Figure 5 1 is a diagram showing the structure of the balloon 160 of the second embodiment in the pre-installation state. In the balloon 160 of the second embodiment, the thickness of the balloon 160 is also uniform in thickness and is configured with uniform hardness in the pre-installation state before being installed in the insertion portion 12. In addition, the structure of the first barrel 160A is the same as that of the balloon 60 of the first embodiment, so its description is omitted.

[0103] In the state before the balloon 160 shown in the second embodiment is installed in the insertion part 12, the inner diameter d2(b) of the second tube part 160B is larger than 1 / 2 of the outer diameter D of the insertion part 12 and smaller than the outer diameter D of the insertion part 12. In addition, in terms of the axial length of the balloon 160, the axial length l2(b) of the second tube part 160B is longer than the axial length l1(b) of the first tube part 160A.

[0104] The second barrel 160B of the balloon 160 of the second embodiment is formed in a state before installation so that the inner diameter d2(b) is larger than the inner diameter d1(b) of the first barrel 160A. Therefore, when the axial length l2(b) of the second barrel 160B is the same length as the axial length l1(b) of the first barrel 160A, the contact pressure of the second barrel 160B when installed on the insertion portion 12 is reduced compared to the first barrel 160A. In the balloon 160 of the second embodiment, the contact area between the second barrel 160B and the insertion portion 12 is increased by extending the axial length l2(b) of the balloon 160, and the second barrel 160B is held and fixed to the insertion portion 12 at a predetermined contact pressure.

[0105] In the pre-installation state, the inner diameter d2(b) of the second barrel 160B is preferably set to be more than 1 / 5 of the maximum inner diameter d3 of the balloon body 160C. By setting the inner diameter d2(b) of the second barrel 160B within the above range relative to the maximum inner diameter d3 of the balloon body 160C, the mold used in manufacturing the balloon can be easily pulled out from the second barrel 160B side. As a manufacturing method of the balloon 160, for example, after the mold is immersed in a resin solution that becomes the material of the balloon, it is taken out from the resin solution and dried, thereby forming a balloon around the mold. Then, the balloon is manufactured by taking out the mold from the inside of the balloon. According to the balloon 160 of the second embodiment, even when the inner diameter of the first barrel 160A is reduced, the mold can be easily pulled out from the second barrel 160B side by setting the inner diameter of the second barrel 160B to be larger than the inner diameter of the first barrel 160A.

[0106] In addition, as a method for manufacturing a balloon, in addition to a method of forming a balloon on the outside of a mold, there is also a method of forming a balloon on the inside of a mold. As a method of forming a balloon on the inside of a mold, first, the material of the balloon is inserted into the inside of the mold and air is blown in so that the material of the balloon adheres to the inside of the mold. Then, the balloon is solidified by cooling the mold. Finally, the balloon is molded by opening the mold and removing the balloon. By molding the balloon in this way, even if the diameters of the first barrel 60A and the second barrel 60B are thin as in the balloon of the first embodiment, the balloon can be molded.

[0107] In the second embodiment, the balloon 160 is also mounted on the insertion portion 12 by utilizing the contraction force of the second tube 160B, so the insertion portion 12 can be reduced in diameter even after the balloon 160 is mounted. Therefore, only the endoscope 10 can be removed from the overtube, and only the overtube can be left in the body when necessary during treatment.

[0108] Furthermore, in the balloon 160 of the second embodiment, when the inner diameter of the second tube portion 160B is set to d2(b) [mm] and the axial length of the second tube portion 160B is set to l2(b) [mm], the second tube portion 160B satisfies the following formula (2) in the pre-installation state.

[0109] [Mathematical expression 10]

[0110]

[0111] With regard to the second barrel 160B, by designing the balloon 160 to satisfy the above formula (2), the balloon 160 can be installed in the insertion portion 12 with an optimal contraction force in consideration of the material and size of the second barrel 160B of the balloon 160. Furthermore, since the balloon 160 is installed by utilizing the contraction force of the second barrel 160B, the outer diameter after installation can be reduced even at the installation position of the balloon 160 on the base end side of the insertion portion 12. Therefore, the endoscope 10 can be pulled out through the outer tube while the balloon 160 is installed in the endoscope, so that the outer tube can be left in the body and the endoscope 10 can be pulled out when necessary during treatment.

[0112] In addition, there is only an outer sleeve on the base end side (operating part side) of the insertion part 12, so even if the axial length l2(b) of the second barrel 160B side of the balloon 160 is extended, it can be handled without affecting the operation of the endoscope. Therefore, on the second barrel 160B side, by changing the inner diameter d2(b) [mm] of the second barrel 160B and the axial length l2(b) [mm] of the second barrel 160B, it is possible to obtain a holding force that can hold the balloon 160 by the second barrel 160B.

[0113] As a design satisfying the above formula (2), it is shown that the outer diameter D of the insertion portion 12 is set to 10 mm, the wall thickness t of the balloon 160 is set to 0.15 mm, the Young's modulus E of the material of the balloon 160 is set to 0.5 MPa, and the axial length l2(b) of the second tube portion 160B of the balloon 160 that can obtain the holding force is changed as shown in the following Table 2.

[0114] [Table 2]

[0115] <![CDATA[d2(b)[mm]]]> 2.5 5 8 <![CDATA[l2[mm]]]> 8 45 285

[0116] By increasing the inner diameter d2(b) of the second tube portion 160B of the balloon 160, the pressure when installing the balloon is reduced, but the contact area between the second tube portion 160B and the insertion portion 12 can be increased. As a whole, the second tube portion 160B can hold and fix the insertion portion 12 with an optimal contraction force.

[0117] As in the first embodiment, the inner diameter d1(b) of the first barrel 160A is preferably 1 / 25 or more and 1 / 10 or less relative to the maximum inner diameter d3 of the balloon body 160C. Furthermore, when the inner diameter d2(b) of the second barrel 160B is set to be 1 / 5 or more of the maximum inner diameter d3 of the balloon body 160C, the axial length l2(b) of the second barrel 160B is preferably set to be 5 times or more of the axial length l1(b) of the first barrel 160A. By setting the inner diameter d2(b) of the second barrel 160B to be 1 / 5 or more of the maximum inner diameter d3 of the balloon body 160C, the inner diameter d2(b) of the second barrel 160B becomes larger. Therefore, when the length l2(b) of the second barrel 160B is the same length as the length l1(b) of the first barrel 160A, the contraction pressure applied to the insertion portion 12 by the second barrel 160B is reduced. By extending the axial length l2(b) of the second tube portion 160B, the contact area can be increased, so that the second tube portion 160B can be gripped and fixed to the insertion portion 12 of the endoscope.

[0118] (Third embodiment)

[0119] Figure 6 2 is a diagram showing the structure of the balloon of the third embodiment before installation. Figure 7 2 is a diagram for explaining the installation state of the balloon of the third embodiment. Regarding the balloon 260 of the third embodiment, in the pre-installation state before being installed on the insertion portion 12, the thickness of the balloon 260 is also uniform and is configured with uniform hardness. In addition, the structure of the first barrel 260A is the same as the first barrel 60A of the balloon 60 of the first embodiment, so its description is omitted.

[0120] The balloon 260 shown in the third embodiment is formed such that the inner diameter d2(b) of the second barrel 260B is larger than 1 / 2 of the outer diameter D of the insertion portion 12 before being installed in the insertion portion 12. In this case, if the axial length of the second barrel 260B is not extended as in the balloon 160 shown in the second embodiment, sufficient holding force for installation in the insertion portion 12 cannot be obtained. When sufficient contraction force cannot be obtained only by the second barrel 260B, as shown in the second embodiment, Figure 7 As shown in FIG. 2 , the second tube portion 260B can be fixed to the insertion portion 12 by fitting the second tube portion 260B to the fixing member 61 of the insertion portion 12 .

[0121] In the balloon 260 of the third embodiment, the front end side (first barrel 260A side) of the insertion portion 12 is also reduced in diameter, so that it is easy to pass over the stenosis when inserting the endoscope. In addition, in the state before the balloon 260 is installed, by setting the inner diameter of the second barrel 260B to be larger than 1 / 2 of the outer diameter of the insertion portion 12 and setting the axial length of the second barrel to be the same as that of the first barrel, the mold for manufacturing the balloon 260 can be easily pulled out.

[0122] As the fixing member 61, a rubber band with elastic force can be used. By embedding the rubber band from the outer periphery of the second barrel 260B installed on the insertion part 12, the insertion part 12 and the second barrel 260B can be fixed. In addition, it is also possible to fix it by winding a nylon line from the top of the second barrel 260B. In addition, as another method of fixing to the insertion part 12, it is also possible to fix it by bonding the second barrel 260B of the balloon and the insertion part 12 with double-sided tape.

[0123] <How to install the balloon>

[0124] Next, the method of installing the balloon is described. Figure 8 It is a three-dimensional view showing a balloon mounting device.

[0125] like Figure 8 As shown, the balloon mounting device 310 has an arm 312, an arm holding boss (movable barrel holding member) 313, a movable barrel 314, a handle 311 as a movable barrel displacement mechanism, an operating rod 315, and an arm closing ring 316. A through hole (not shown) is provided in the upper part of the handle 311 in the horizontal direction, and the movable barrel 314 is accommodated in the through hole so as to be movable. The movable barrel displacement mechanism moves the movable barrel 314 in the horizontal direction in the through hole relative to the arm holding boss 313. By moving the movable barrel 314, the shape of the receiving portion 312C at the front end of the arm 312 can be changed to a reduced diameter state and an expanded diameter state.

[0126] The handle 311 is provided with an arm holding boss 313 as a movable barrel holding member so as to be externally fitted to the movable barrel 314. Four arm holding grooves 330 are formed in the arm holding boss 313 in the radial direction, and the arm 312 is inserted into the arm holding grooves 330 and is mounted to be swingable.

[0127] A circular arc-shaped cutout 335 is formed at the outer edge of each arm 312, and an arm closing ring 316 composed of an O-ring is embedded in the cutout 335. The arm closing ring 316 applies force to each arm 312 inwardly. In this state, the four receiving parts 312C are close to each other, and the first barrel 60A and the second barrel 60B of the balloon 60 will not expand in diameter through the narrowed receiving part 312C and can be set in a natural state. For example, the setting of the balloon 60 on the receiving part 312C can be performed as follows. First, the balloon 60 is formed by winding the balloon 60 from the second barrel 60B side to the outside to form the second barrel 60B and the balloon body 60C are wound. Then, the receiving part 312C is inserted into the first barrel 60A of the wound balloon 60, and the balloon 60 is set on the receiving part 312C.

[0128] After the balloon 60 is set, the operating rod 315 is gripped and pulled out, whereby the movable cylinder 314 moves in the insertion hole in the push-out direction of the arrow A. By the movement of the movable cylinder 314, the front end of the movable cylinder 314 presses the inner surface of each arm 312 to displace and open each arm 312. By the displacement of the arm, the first cylinder portion 60A and the second cylinder portion 60B of the balloon 60 provided in the receiving portion 312C are gradually expanded.

[0129] By moving the movable barrel 314 in the pushing direction, the first barrel 60A and the second barrel 60B are in the state of maximum diameter expansion. In this maximum diameter expansion state, the first barrel 60A and the second barrel 60B are expanded to a size exceeding the insertion portion 12 of the endoscope, so that the insertion portion 12 can be inserted into the movable barrel 314.

[0130] Remove and insert the insertion part 12, such as Fig. 9 As shown, the insertion section 12 is positioned at the installation position of the first barrel 60A. Then, the operating rod 315 is pulled out, whereby the movable barrel 314 moves in the push-out direction of the arrow A. If the front end surface of the movable barrel 314 passes through the front end of the receiving portion 312C of the arm 312, the first barrel 60A is not supported by the receiving portion 312C due to the passage of the front end surface, and the diameter is reduced at the installation position of the insertion section 12, and the first barrel 60A is installed at the installation position.

[0131] The balloon 60 provided in the insertion portion 12 in a rolled state can be attached to the insertion portion 12 by rolling the balloon back.

[0132] As described above, according to this embodiment, the first tube 60A of the balloon 60 can be mounted on the insertion portion 12 of the endoscope only by the contraction force of the balloon 60, and there is no need for a component to fix the balloon 60, so the front end of the insertion portion 12 can be reduced in diameter. As a result, when the insertion portion 12 is inserted into the body, it can easily pass through the stenosis.

[0133] Furthermore, the base end of the balloon 60 can also be reduced in diameter by installing the second tube 60B only by the contraction force of the balloon 60. Thus, the endoscope can be passed into the overtube, so that the overtube can be left in the body and only the endoscope 10 can be removed when necessary during treatment.

[0134] Explanation of symbols

[0135] 1- endoscope device, 10- endoscope, 12- insertion portion, 14- operation portion, 16- universal cord, 18- LG connector, 20- light source device, 22- cable, 24- electrical connector, 26- processor, 28- air supply and water supply button, 30- suction button, 32- shutter button, 34- function switching button, 36- angle button, 38- balloon air supply port, 40- soft portion, 42- bending portion, 44- front end portion, 45- front end surface, 46- forceps insertion portion, 48- air supply and water supply connector, 49- suction connector, 50- monitor, 52- observation window, 54- lighting window, 56- air supply and water supply nozzle, 58- forceps port, 60, 160, 260- balloon, 60A, 160A , 260A-the first cylinder, 60B, 160B, 260B-the second cylinder, 60C, 160C, 260C-the balloon body, 61-fixing part, 64-vent, 70-balloon control device, 72-device body, 74-manual switch, 76-pressure display part, 80-hose, 82-backflow prevention unit, 84-cord, 86-balloon dedicated monitor, 92-inner cylinder, 94-outer cylinder, 310-installation device, 311-handle, 312-arm, 312C-receiving part, 313-arm holding boss, 314-movable cylinder, 315-operating rod, 316-arm closing ring, 330-arm holding groove, 335-incision, SW1-power switch, SW2-stop switch.

Claims

1. An endoscope device comprising: an endoscope having an insertion portion; and a balloon mounted on the insertion portion, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. In the pre-installation state, the inner diameter of the first cylindrical portion is not less than 1 / 10 and not more than 1 / 2 of the outer diameter of the insertion portion, In the pre-installation state, the inner diameter of the second cylindrical portion is larger than 1 / 2 of the outer diameter of the insertion portion and smaller than the outer diameter of the insertion portion. The length of the second tube portion in the axial direction of the balloon is longer than the length of the first tube portion.

2. The endoscope device according to claim 1, wherein: In the pre-installation state, the inner diameter of the second tube portion is greater than or equal to 1 / 5 of the maximum inner diameter of the balloon body.

3. An endoscope device comprising: an endoscope having an insertion portion; and a balloon mounted on the insertion portion, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. In the pre-installation state, the inner diameter of the first cylindrical portion is not less than 1 / 10 and not more than 1 / 2 of the outer diameter of the insertion portion, In the pre-installation state, the inner diameter of the second cylindrical portion is larger than 1 / 2 of the outer diameter of the insertion portion. A fixing member is provided for externally fitting and fixing the second cylindrical portion to the insertion portion.

4. An endoscope device comprising: an endoscope having an insertion portion; and a balloon mounted on the insertion portion, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. When the Young's modulus of the material of the balloon is set to E, the unit of E is MPa, the inner diameter of the insertion portion is set to D, the unit of D is mm, and in the pre-installation state, the inner diameter of the first tube is set to d1(b), the unit of d1(b) is mm, the axial length of the first tube is set to l1(b), the unit of l1(b) is mm, and the wall thickness of the balloon is set to t, the unit of t is mm, the following formula is satisfied, [Mathematical expression 1] 。 5. The endoscope device according to claim 4, wherein: In the state before installation, when the inner diameter of the second cylinder is set to d2(b), the unit of d2(b) is mm, and the axial length of the second cylinder is set to l2(b), the unit of l2(b) is mm, the following formula is satisfied: [Mathematical expression 2] 。 6. A balloon mounted on an insertion portion of an endoscope, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. In the pre-installation state, the inner diameter of the first cylindrical portion is not less than 1 / 10 and not more than 1 / 2 of the outer diameter of the insertion portion, In the pre-installation state, the inner diameter of the second cylindrical portion is larger than 1 / 2 of the outer diameter of the insertion portion and smaller than the outer diameter of the insertion portion. The length of the second tube portion in the axial direction of the balloon is longer than the length of the first tube portion.

7. A balloon mounted on an insertion portion of an endoscope, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. In the pre-mounting state, the inner diameter of the first cylindrical portion is not less than 1 / 25 and not more than 1 / 10 of the maximum inner diameter of the balloon body.

8. The balloon according to claim 7, wherein: In the pre-mounting state, the inner diameter of the second tube portion is not less than 1 / 25 and not more than 1 / 10 of the maximum inner diameter of the balloon body.

9. The balloon according to claim 7, wherein: In the pre-installation state, the inner diameter of the second tube portion is at least 1 / 5 of the maximum inner diameter of the balloon body. The length of the second tube portion is at least five times the length of the first tube portion.

10. A balloon mounted on an insertion portion of an endoscope, wherein: In a pre-installation state before the balloon is installed on the insertion portion, the balloon has a uniform wall thickness and a uniform hardness. The balloon has: a first cylindrical portion, which is provided at one end of the balloon and mounted at a first position on the front end side of the insertion portion; a second cylindrical portion provided at the other end of the balloon and mounted at a second position closer to the proximal end of the insertion portion than the first position; and The balloon body is disposed between the first tube portion and the second tube portion. When the Young's modulus of the material of the balloon is set to E, the unit of E is MPa, the inner diameter of the insertion portion is set to D, the unit of D is mm, and in the pre-installation state, the inner diameter of the first tube is set to d1(b), the unit of d1(b) is mm, the axial length of the first tube is set to l1(b), the unit of l1(b) is mm, and the wall thickness of the balloon is set to t, the unit of t is mm, the following formula is satisfied, [Mathematical expression 3] 。 11. The balloon according to claim 10, wherein: When the inner diameter of the second tube portion is d2(b), the unit of d2(b) is mm, and the axial length of the second tube portion is l2(b), the unit of l2(b) is mm, the following formula is satisfied: [Mathematical expression 4] 。

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