JPH07116262A - Expanding body for medical treatment - Google Patents

Abstract

PURPOSE:To easily expand the expanding body with a simple operation with a less burden on a doctor or patient by making it possible to expand the expanding body in the celom at the time of expanding the contracted part of a vital tube-line line or assuring the internal cavity of the vital tube-line. CONSTITUTION:This expanding body consists of an expandable bag-shaped member 9 introduced into the celom, a first chemical material 12 and a second chemical material 13 for expanding this bag-shaped member 9 to a large diameter. The first chemical material 12 and the second chemical material 13 are mixed to induce a chemical reaction and the bag-shaped member 9 is expanded to a desired size by the generated gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, in an endoscopic surgical procedure, secures an internal operative field such as abdominal cavity, thoracic cavity, retroperitoneal cavity or the like, or blood vessels, esophagus, bile duct, pancreatic duct, ureter. , Medical swelling by expanding the stenosis that has occurred in the body tract such as the urethra or large intestine and securing the lumen of the body tract by expanding it in the body cavity such as a body tract dilator (balloon dilator) Regarding the body

[0002]

2. Description of the Related Art Conventionally, in endoscopic surgery, when observing female organs such as the uterus, fallopian tubes, and ovaries in the abdominal cavity, it is necessary to move those organs to a location where they can be easily observed. In this case, as shown in Japanese Patent Application No. 4-53641, the organs were moved by observation assisting forceps called a retractor to secure the visual field.

On the other hand, a biological conduit dilator (balloon dilator) for expanding a biological conduit is disclosed in Japanese Patent Laid-Open No. 5-38367. As shown in FIG. 22, the body conduit dilator is provided at the distal end of the catheter 1 and has a balloon portion 2 formed of a non-stretchable material such as polyethylene,
An injection / discharge hole 3 provided on the proximal side of the catheter 1 for injecting / exhausting a fluid into the balloon portion 2, a three-way stopcock 4 attached to the injection / discharge hole 3, a pressure gauge 5, and a syringe 6 for injection / discharge. The pressurizing pistol 7 having a ratchet mechanism attached thereto was used to send a high-pressure fluid to the balloon part 2 to inflate it.

[0004]

However, regarding the retractor used in the endoscopic surgery,
During surgery, the doctor must always hold the retractor and move the organs so that they can be observed easily.
It is a burden to the doctor. Further, it is necessary to open a hole for inserting the retractor into the body, which is invasive and burdens the patient.

On the other hand, with respect to the balloon dilator, the balloon portion is made of a non-extensible material, and it is necessary to inject a high-pressure fluid in order to make it hard enough to withstand the narrowed portion. Therefore, the above-mentioned ratchet mechanism is used. It required a dedicated injector (pressurizing pistol) to have, and the work was troublesome. Further, if the balloon has a large capacity, the injection work must be repeated many times, which is troublesome.

The present invention has been made by paying attention to the above-mentioned circumstances, and an object thereof is to expand a narrowed portion of a living body duct or to secure a lumen of the duct within a body cavity. It is an object of the present invention to provide a medical inflatable body that is easy to inflate and has a small burden on a doctor or a patient.

[0007]

In order to achieve the above object, the present invention has an inflatable bag-shaped member introduced into a body cavity and a chemical reaction for expanding the bag-shaped member to a large diameter. It is composed of a gas generating means.

By constructing the medical inflatable body by the chemical reaction gas generating means for expanding the bag-shaped member to a large diameter, the burden on the doctor and the patient is reduced, and the bag-shaped member is easily desired by a simple operation. Can be expanded to the size you want.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment, which is a medical expander used to secure a surgical field in endoscopic surgery.

As shown in FIGS. 1 and 2, the medical inflatable body 8 is formed of a ring-shaped elastic member, and is formed of a bag-shaped member 9 having a hollow portion 9a therein. A part of the inner wall 10 of the hollow portion 9a of the medical inflatable body 8 is made of thin-walled polyethylene, latex balloon or the like, and an easily destructible bag 11 that is easily destroyed by applying pressure from the outside is fixed by adhesion or the like. There is. A first chemical substance 12 as a chemical reaction gas generating means is filled in the inner cavity of the easily destructible bag 11, and a second chemical substance 13 is filled in the hollow portion 9a.

The first chemical substance 12 is, for example, a fluid substance, and the second chemical substance 13 is, for example, a powder substance. The first chemical substance 12 and the second chemical substance are used. A substance that generates a gas by causing a chemical reaction by mixing 13 is used.

For example, carbon dioxide (gas) is generated by a chemical reaction between a mixture of sodium bicarbonate and tartaric acid (powder) and water, and carbon dioxide (carbon dioxide is generated by a chemical reaction between sodium bicarbonate (powder) and acetic acid (solution) ( Generation of gas) is preferably used.

In addition to the above, metal powders (K, C
generation of hydrogen (gas) by a chemical reaction between a, Na, Mg, etc.) and water, metal powder (K, Ca, Na, Mg, Al,
Zn, Fe, Ni, Sn, Cu, Hg, Ag) and acid (H
Cl, H ₂ SO ₄ , HNO ₃ ) hydrogen by a chemical reaction,
Various substances such as generation of nitric oxide, nitrogen dioxide, sulfur dioxide (gas), generation of carbon dioxide (gas) by a chemical reaction between calcium carbonate (powder) and hydrochloric acid (liquid) can be used.

These first and second chemical substances 12, 13
Is calculated and provided in advance for the amount of gas generated according to the volume of the medical expander 8. Further, a marker 14 as a mark is provided on a portion of the outer peripheral surface of the medical inflatable body 8 where the easily destructible bag 11 is located.

Next, a method of using the medical expander 8 constructed as described above in an endoscopic surgical operation will be described. As shown in FIG. 3, the trocar 16 is inserted into the body wall 15 such as the abdominal wall, and the grasping forceps 17 grasps the portion of the small-diameter medical inflatable body 8 where the marker 14 is not attached to the inside of the body cavity a. insert. Next, the treatment target organ is placed in the body cavity a so as to be located at the center of the ring of the medical expander 8.

In this state, as shown in FIG. 4, the portion of the outer peripheral surface of the medical inflatable body 8 marked with the marker 14 is strongly grasped by the grasping forceps 17 and pressure is applied. By applying pressure, the easily destructible bag 11 inside the hollow portion 9a is destroyed, the liquid first chemical substance 12 inside the easily destructible bag 11 flows out, and the powdery second chemical substance 13 and the hollow portion Mix at 9a.

When the first chemical substance 12 and the second chemical substance 13 are mixed with each other, a chemical reaction occurs, gas is generated, and the bag-shaped member 9 expands to a large diameter. With the expansion of the bag-shaped member 9, the medical inflatable body 8 pushes the peripheral organs 18a and 18b in the body cavity a in the direction of the arrow b as shown in FIG. Part 1
9 is located. Then, for example, by inserting the laser probe 20 into the trocar 16, the peripheral organs 18a,
The treatment portion 19 can be easily treated without the obstacle 18b. Further, after the treatment is completed, a hole is made in the wall of the bag-shaped member 9 that constitutes the medical inflatable body 8, the internal gas is discharged to make the diameter small, and then the bag is grasped by the grasping forceps 17 or the like and the trocar 14 is used. Can be taken out of the body.

The medical expander 8 constructed in this way expands from a small diameter to a large diameter by causing a chemical reaction accompanied by gas generation inside, and pushes the peripheral organs 18a, 18b. It is not necessary to hold the organ between the retractors, which reduces the burden on the doctor. Further, there is no need to provide a hole for inserting the retractor in the body wall, which has the effect of reducing invasion to the patient.

FIG. 6 shows a second embodiment. The same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. An easily destructible bag 11 is fixed to the inner wall 10 in the hollow portion 9a of the bag-shaped member 9 constituting the medical inflatable body 21, as in the first embodiment. Then, as in the first embodiment, the liquid first chemical substance 12 is contained in the easily destructible bag 11 and the hollow portion 9a is formed.
Is filled with the powdered second chemical substance 13. When the first chemical substance 12 and the second chemical substance 13 are mixed, a chemical reaction is caused to generate a gas. On the inner wall 10 of the bag-shaped member 9, a needle-like protrusion 22 having rigidity is provided at a portion facing the easily destructible bag 11.

The medical inflatable body 21 thus constructed is
Like the first embodiment, it is inserted into the body cavity through the trocar 16 in a state of contracting to a small diameter. Then, the organ to be treated is placed inside the body cavity so as to be located at the center of the ring of the medical expandable body 21. In this state, when the marker 14 on the outer peripheral surface of the medical inflatable body 21 is grasped by the grasping forceps 17, the inner wall 10
The protruding portion 22 fixed to pierces and breaks the easily destructible bag 11, and the first chemical substance 12 and the second chemical substance 13 are mixed. As a result, a chemical reaction occurs, gas is generated, and the bag-shaped member 9 made of an elastic member expands. With the expansion of the bag-shaped member 9, the medical inflatable body 21 pushes the peripheral organs in the body cavity, and the treatment portion is located in the ring-shaped central portion.

According to this embodiment, in addition to the effect of the first embodiment, the projection is provided at the position facing the easily destructible bag on the inner wall of the bag-shaped member constituting the medical inflatable body. It becomes possible to destroy the easily destructible bag.

FIG. 7 and FIG. 8 show a third embodiment of the first embodiment.
The same components as those of the embodiment are given the same reference numerals and the description thereof will be omitted. This embodiment is an application example to a body wall holder such as an abdominal wall. The body wall holder 23 is made of a gourd-shaped bag member 24 having elasticity, and an easily destructible bag 25 is fixed to the inner wall 24a by adhesion or the like as in the first embodiment.
A liquid first chemical substance 12 is provided inside the easily destructible bag 25, and a powdery second chemical substance 13 is provided inside the inner cavity of the bag-shaped member 24. A marker 14 as a mark is attached to the outer surface of the bag-shaped member 24 to which the easily destructible bag 25 is fixed.

With the body wall holder 23 constructed as described above contracted to a small diameter, the portion not provided with the marker 14 is grasped with grasping forceps or the like, and the number of corners in the body cavity is inserted through the trocar 16. Position it in the place. Then, after that, similarly to the first embodiment, the portion of the marker 14 is strongly gripped with gripping forceps or the like, and pressure is applied. As a result, the easily destructible bag 25 is destroyed, and the first chemical substance 12 inside flows out and mixes with the second chemical substance 13. And the first chemical substance 12 and the second
The chemical substance 13 causes a chemical reaction to generate a gas (gas), and the body wall holder 23 including the bag-shaped member 24 expands,
The body wall 15 can be lifted as shown in FIG.

Therefore, an operation space can be secured, diagnosis and treatment can be performed, and when the operation is completed, a hole is opened in the wall of the bag-like member 24 constituting the body wall holder 23, and the gas inside is removed to make it thin. After setting the diameter, it can be extracted through the trocar 16.

By using the body wall holder constructed as described above, it is not necessary to secure the operative field by constantly filling the body cavity with CO ₂ gas during the operation and causing pneumoperitoneum. This has the effects of eliminating the need for a pneumoperitoneum device, simplifying the operator's operation, and avoiding complications such as air embolism of the patient.

FIGS. 9 to 12 show a fourth embodiment of the first embodiment.
The same components as those of the embodiment are given the same reference numerals and the description thereof will be omitted. This embodiment is an application example of an obturator used in endoscopic surgery.

The obturator 26 is formed by a C-ring bag 27 having elasticity as shown in FIG. On the inner wall 28 of the inner cavity 27a of the bag-shaped member 27, an easily destructible bag 29 that is destroyed by applying a certain pressure or more is fixed by adhesion or the like. A liquid first chemical substance 12 is mixed in the inner cavity of the easily destructible bag 29, and a second chemical reaction gas is generated in the inner cavity 27a by mixing with the first chemical substance 12 to generate a gas. The chemical substance 13 is provided as in the first embodiment. Further, the marker 14 as a mark is provided on the outer peripheral surface of the obturator 26 on which the easily destructible bag 29 is located.

A case in which the obturator 26 configured as described above is used for treating reflux esophagitis will be described. Obturator 2
In a state where 6 is contracted to a small diameter, a portion not provided with the marker 14 is grasped by grasping forceps or the like (not shown), and is percutaneously introduced into the body cavity through a trocar (not shown).

Then, as shown in FIG. 11, the C-ring obturator 26 is locked to the upper portion 31 of the stomach 30. After that, the marker 14 on the outer peripheral surface of the obturator 26 is grasped by grasping forceps or the like and pressure is applied to destroy the easily destructible bag 29. As a result, the liquid first chemical substance 12 and the powder second chemical substance 1
3 is mixed, and a chemical reaction is caused to generate gas. An obturator 26 including a bag-shaped member 27 having elasticity with the generation of gas
Swells and can tighten the upper portion 31 of the stomach 30 to prevent gastric acid from refluxing into the esophagus, as shown in FIG.

By using the obturator 26 constructed in this manner, the operator can easily obstruct the upper part 31 of the stomach 30, and the operation time can be shortened. The obturator 26 can be used not only for treating reflux esophagitis but also as an obturator for diet by closing the central portion 30a of the stomach 30 as shown in FIG.

13 and 14 show a fifth embodiment,
It is an application example to a balloon dilator that dilates a stenosis portion that has occurred in a biological duct. The balloon dilator 32 includes a multi-lumen catheter 33 and the catheter 33.
The balloon portion 34 is provided at the tip of the balloon and is made of a non-stretchable material such as polyethylene. The catheter 33 is branched at the branch portion 35 on the proximal side, and the balloon portion 34
An injection / exhaust hole 36 for injecting / exhausting a fluid therein,
A guide wire hole 38 for communicating with the distal end 37 of the catheter 33 and for inserting a guide wire is provided.

A syringe 39 is connected to the inlet / outlet hole 36, and a valve 40 and a balloon portion 3 are provided.
A pressure gauge 41 for monitoring the pressure inside 4 is connected. Inside the syringe 39, a minute amount of liquid first chemical substance 12 is provided as in the first embodiment.
On the other hand, the first chemical substance 1 is a powder inside the balloon portion 34.
The second that causes a chemical reaction with gas generation when mixed with 2.
The chemical substance 13 is encapsulated.

Balloon dilator 3 constructed in this way
In the usage of No. 2, first, with the valve 40 closed, the balloon portion 34 is inserted into a living duct such as the bile duct, ureter, urethra, fallopian tube, or esophagus and positioned at the stenotic site.

Next, the valve 40 is opened and the syringe 39 is operated to inject the liquid first chemical substance 12 into the balloon portion 34. As a result, the first chemical substance 12
Then, the powdery second chemical substance 13 in the balloon portion 34 mixes and causes a chemical reaction. Then, gas 42 is generated in the balloon portion 34, and the balloon portion 34 expands to have a large diameter and expand the narrowed portion.

When the gas 42 is generated in the balloon portion 34, the valve 40 is closed. Further, while watching the pressure gauge 41, if the pressure inside the balloon portion 34 becomes too high, the valve 40 is opened to allow the gas 42 inside to escape to the outside, or if the pressure is low, the first chemical substance is further added by the syringe 39. 12 is sent into the balloon portion 34, and gas 42 is further generated.
When the expansion of the narrowed portion is completed, the valve 40 is opened, the gas 42 in the balloon portion 34 is discharged using the syringe 39, and the balloon portion 34 is contracted and then withdrawn.

The balloon dilator thus constructed requires a very small amount of fluid to be injected, as compared with the conventional case where a large amount of saline or air is injected from the hand side with a syringe, thus reducing the burden on the operator. To do. Also, the balloon part of the balloon dilator has a hardness that does not lose to the stenosis,
Although a high pressure is required, the operator can easily generate a high pressure without using a pressurizing pistol with a ratchet mechanism as in this embodiment.

FIGS. 15 and 16 show a sixth embodiment, which is a modification of the balloon dilator of the fifth embodiment. The balloon dilator 43 is composed of a catheter 44 and a balloon portion 45 formed at the tip of the catheter 44 and made of a non-extensible material. Catheter 4
A valve 40 and a pressure gauge 41 are connected to the hand side of No. 4 as in the fifth embodiment. Further, a cored bar wire 46 is inserted from the proximal side to the distal end portion in the lumen of the catheter 44. The inner wall of the balloon portion 45 is shown in FIG.
As shown in FIG. 6, a powdery catalyst 47 that promotes a chemical reaction to generate a gas by contacting with a chemical substance 48 described later is fixed by adhesion or the like.

On the other hand, a syringe 39 having a liquid chemical substance 48 contained therein is connected to the injection / discharge hole 36 at the proximal portion of the catheter 44. The chemicals 48 as, for example hydrogen peroxide (H ₂ O _2), but also manganese dioxide (MnO ₂₎ is used as the catalyst 47, and when both are in contact,

[0039]

[Equation 1] Oxygen gas is generated at.

According to this embodiment, in addition to the effects of the fifth embodiment, manganese dioxide, which is a catalyst not directly involved in the reaction, is used in the balloon. If a chemical substance is injected, gas is generated again in the balloon, and this has the effect that this can be repeated any number of times.

17 and 18 show a seventh embodiment, which is an example of application to a peeling tool used in endoscopic surgery. As shown in FIG. 17, the peeling tool 49 is used for the catheter 5
0 and a balloon portion 51 which is provided at the distal end portion of the catheter 50 and is made of an extension material such as latex. At the proximal side of the catheter 50, as in the fifth embodiment, the pressure gauge 41, the valve 40 and the injection / discharge hole 3 are provided.
A syringe 39 connected to 6 is provided.

A powder catalyst 47 is fixed to the inner wall of the balloon portion 51 by adhesion or the like as in the sixth embodiment.
In addition, the liquid chemical substance 4 in the syringe 39, which is brought into contact with the catalyst 47, promotes a chemical reaction involving gas generation.
8 are provided.

Using the peeling tool 49 configured as described above,
In order to approach the kidney and the like, a case where the retroperitoneal wall and the peritoneum are separated to secure the retroperitoneal cavity will be described. First,
As shown in FIG. 18A, the peeling tool 49 is inserted into the narrow gap between the posterior abdominal wall and the peritoneum via the trocar 16 inserted into the back c of the human body. Next, as in the sixth embodiment, after opening the valve 40, a small amount of the chemical substance 4 in the syringe 39
8 (liquid) is injected into the balloon 51 and brought into contact with the catalyst 47. As a result, a chemical reaction involving gas generation is promoted, and the balloon 51 is inflated as shown in FIG. 18 (B). Then, after the posterior abdominal wall 52 and the peritoneum 53 are separated, the peritoneal cavity 54 is secured, and the kidney or the like can be approached. Further, when the retroperitoneal cavity 54 is secured, the valve 40 is operated to open it, the gas in the balloon 51 is released to be deflated, and the balloon 51 is removed via the trocar 16.

With the peeling tool 49 thus constructed, a balloon having a relatively large capacity can be inflated by the same simple operation as in the sixth embodiment. FIG. 19 shows Example 1 in which the volume change of a chemical reaction accompanied by gas generation is used for driving an actuator. As shown in FIG. 19 (A), a thin diaphragm 56 is provided in the inner cavity of the cylinder 55 and is divided into a first space 57 and a second space 58. In the first space 57, the same liquid first chemical substance 12 as in the first embodiment is used, and in the second space 58, the powdery second chemical substance 1 is used.
3 is enclosed.

When the first chemical substance 12 and the second chemical substance 13 are mixed, a chemical reaction occurs and a gas is generated.
On the other hand, a pin 60 having a needle portion 59 for breaking the diaphragm 56 and mixing the first chemical substance 12 and the second chemical substance 13 is provided in the first space 57, and the airtight hole 61 is provided. A pressing portion 62 is provided which is led out of the cylinder 55 through the. On the other hand, the piston 63 is provided in the second space 58.
The sliding portion 64 is provided with an O-ring 65 for maintaining airtightness. Further, the drive rod 66 of the piston 63 is led out of the cylinder 55 through the hole 67.

In the actuator constructed as described above, the diaphragm 56 is broken by the needle portion 59 of the pin 60 when the pressing portion 62 is pushed in, and the liquid first chemical substance 12 is formed.
Flow out into the second space 58 and mix with the powdery second chemical substance 13. Then, a chemical reaction occurs and gas is generated. Due to the volume change caused by the gas generation, the piston 63
Is driven, and the drive rod 66 moves in the direction shown by the arrow in FIG. And this generated force can be used as an actuator.

The actuator thus constructed can start driving the actuator only by the pushing operation of the pressing portion, and is excellent in operability. Further, since a chemical reaction accompanied by gas generation is used, large displacement and large output driving can be realized as compared with other actuators.

FIG. 20 shows Example 2 in which the volume change of a chemical reaction accompanied by gas generation is used for driving an actuator. As shown in FIG. 20 (A), TiO ₂ particles 70 carrying platinum (Pt) are fixed to the inner wall 69 of the bellows 68 in a normally contracted state by adhesion or the like over the entire surface. Further, the inner cavity of the bellows 68 is filled with the electrolyte solution 71. An end portion of the bellows 68 is provided with an airtightly sealed lid portion 72. The optical fiber 73 is inserted from the outside of the bellows 68 into the inner cavity through the lid portion 72,
It is possible to irradiate the platinum-supported TiO ₂ 70 on the inner wall of the bellows 68 with the light of the UV light source 74 provided outside. Further, a pair of electrodes 75 are provided in the inner cavity of the bellows 68 via the lid portion 72, and a high voltage of a high voltage generator 76 provided outside can be applied between the electrodes 75.

The actuator constructed in this way is
UV light is emitted from the V light source 74 and UV light is applied to the inner cavity of the bellows 68 from the tip of the optical fiber 73. UV light emitted from the optical fiber 73 is applied to the platinum-supported TiO ₂ particles 70 on the inner wall of the bellows 68,

[0050]

[Equation 2]

In the reaction of 77, a gas such as hydrogen gas, oxygen gas, etc.
Occurs. With this gas generation, the bellows 68 is driven from the contracted state to the expanded state as shown in FIG. 20 (B). Also, to return the bellows 68 to the initial contracted state,
The high voltage generator 76 is operated to apply a high voltage between the pair of electrodes 75 in the inner cavity of the bellows 68 to perform discharge. This discharge causes a chemical reaction between the oxygen gas and the hydrogen gas, and water is produced. By this phase change from gas to liquid, the bellows 68 can return from the expanded state of FIG. 20 (B) to the initial contracted state of FIG. 20 (C). The expansion / contraction drive of the bellows 68 can be used as an actuator.

Therefore, in addition to the effect of Example 1, the bellows can be reversibly expanded and contracted, and it can be used as a reversible actuator. FIG. 21 is an example 3 in which the volume change of the chemical reaction accompanying the gas generation is used for driving the actuator. As shown in FIG. 21A, a particulate adsorbent 79 that has adsorbed gas is fixed to the inner wall of the container 78 by adhesion or the like.

Examples of the adsorbent include V, Mn, Cr, C
o etc. are used. Further, a pipe-shaped communication hole 80 is provided at one end of the container 78 to communicate the inner cavity of the container 78 with the outside. The communication hole 80 is provided with a check valve 81 and a balloon 82 that can expand and contract. Further, a heater 83 is provided on the outer peripheral surface of the container 78 so that the inner cavity of the container 78 can be heated.
Is attached and provided.

In the actuator thus constructed, the heater 83 is first switched off, and the inner cavity of the container 78 is set to a low temperature so that the gas is adsorbed by the adsorbent 83. Therefore, the balloon 82 is in a deflated state as shown in FIG.

Next, the heater 83 is turned on,
The lumen of the container 78 is heated. Then, the adsorbent 79 provided on the inner wall of the container 78 is heated by the gas 84 adsorbed by the heating.
To release. Then, this gas 84 flows into the balloon 82 through the communication hole 80 and the check valve 81, and FIG.
The balloon 82 is inflated as shown in FIG.

On the other hand, the heater 83 is turned off,
When the container 78 is cooled, the adsorbent 79 adsorbs the gas 84 again, so that the balloon 82 contracts. In this way, the volume change due to the expansion / contraction of the balloon 82 can be used as the driving force of the actuator.

The type of chemical reaction involving gas generation used in the present invention is not limited to those shown in the first to seventh embodiments, and any gas may be generated by a chemical reaction. Good.

[0058]

As described above, according to the present invention, the medical inflatable body is constituted by the bag-shaped member and the chemical reaction gas generating means for expanding the bag-shaped member to a large diameter. When expanding the narrowed part of the body canal or securing the lumen of the canal, it can be inflated in the body cavity, placing a small burden on the doctor or patient, and with a simple operation, the desired size can be easily achieved. It has the effect of being able to expand.

[Brief description of drawings]

FIG. 1 is a perspective view of a medical expander showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the medical expander according to the embodiment.

FIG. 3 is an operation explanatory view of the same embodiment.

FIG. 4 is an operation explanatory view of the same embodiment.

FIG. 5 is a state of use of the medical expander according to the embodiment.

FIG. 6 is a sectional view of a medical expander showing a second embodiment of the present invention.

FIG. 7 is a sectional view of a medical inflatable body showing a third embodiment of the present invention.

FIG. 8 is a view showing a usage state of the medical expander of the embodiment.

FIG. 9 is a perspective view of a medical expander showing a fourth embodiment of the present invention.

FIG. 10 is a sectional view of the medical inflatable body of the same embodiment.

FIG. 11 is a state-of-use diagram of the medical expander of the embodiment.

FIG. 12 is a view showing the usage state of the medical expander of the embodiment.

FIG. 13 is a side view, partly in section, of a medical inflatable body showing a fifth embodiment of the present invention.

FIG. 14 is an explanatory view of the action of the medical expander showing the same embodiment.

FIG. 15 is a side view in which a part of a medical expander showing a sixth embodiment of the present invention is shown in section.

FIG. 16 is an enlarged sectional view of a part of the medical inflatable body of the same embodiment.

FIG. 17 is a side view, partly in section, of a medical expander showing a seventh embodiment of the present invention.

FIG. 18 is an explanatory view of the action of the medical expander showing the same embodiment.

FIG. 19 is a cross-sectional view showing an example 1 in which a volume change of a chemical reaction accompanied by gas generation is used for an actuator.

FIG. 20 is a cross-sectional view showing an example 2 in which a volume change of a chemical reaction accompanied by gas generation is used for an actuator.

FIG. 21 is a cross-sectional view showing an example 3 in which a volume change of a chemical reaction accompanied by gas generation is used for an actuator.

FIG. 22 is a partial cross-sectional side view showing a conventional biological conduit dilator.

[Explanation of symbols]

 8 ... Medical expander 9 ... Bag-shaped member 12 ... First chemical substance 13 ... Second chemical substance

Claims (1)

[Claims] 1. A medical inflatable body comprising an inflatable bag-shaped member introduced into a body cavity and a chemical reaction gas generating means for expanding the bag-shaped member to a large diameter.