JP2796369B2 - Bending operation device for tubular insert - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending operation device for a tubular insertion tool used by being inserted into a body cavity or the like, for example, such as a catheter, an endoscope, and a laser probe.

[Related Art] In general, for example, many insertion tools such as medical catheters and endoscopes are provided with a bending device for bending a distal end portion of an insertion portion. One end of an angle wire for bending operation is fixed to a distal end of an insertion portion inserted into a body cavity as a bending device of this type, and the other end of the angle wire is provided on a proximal operation portion such as an operation knob. 2. Description of the Related Art There is known a configuration in which a distal end portion of an insertion portion is bent by being connected to a pulley or the like of an operation mechanism and pulling an angle wire in accordance with operation of the operation knob.

Further, for example, Japanese Unexamined Patent Application Publication No. 59-97115 discloses a coil-shaped elastic driving member formed of a shape memory alloy at the distal end of an insertion part of an insertion tool such as an endoscope and formed in a compressed state by storing an expanded state. And a bending mechanism for bending the distal end of an insertion portion of an insertion tool such as an endoscope in accordance with the expansion and contraction operation of the elastic driving member.

Further, Japanese Utility Model Laid-Open No. 1-95901 discloses a pair of wires made of a shape memory alloy at the distal end of an insertion portion of an insertion tool such as an endoscope and extending in the axial direction of the insertion portion. A bending mechanism having a configuration in which superelasticity is imparted to the other wire and a curved shape such as an inverted J-shape is stored in the other wire by heat treatment or the like, and these wires are covered with a close contact coil spring for heat interruption. . In this case, at normal temperature, the shape memory wire is held in a linearly deformed state by the superelastic force of the superelastic wire and the elastic force of the close contact coil spring for heat interruption, and the distal end of the insertion portion is held in a linear shape. At the same time, the configuration memory wire is automatically deformed into a pre-stored curved shape by energizing and heating both wires, and the distal end portion of the insertion portion is configured to bend in the deformation direction of the shape memory wire. I have.

[Problems to be Solved by the Invention] In a bending device configured to bend the distal end portion of the insertion portion in accordance with the pulling operation of the angle wire, for example, a small-diameter outer diameter of the insertion portion is small like a blood vessel endoscope. In many cases, a curved tube or the like for guiding the pulling operation of the angle wire is not provided. Therefore, for example, when the insertion portion of the insertion tool is inserted into the body cavity, and the insertion portion is bent in accordance with the shape of the body cavity, the angle wire meanders, so that accurate bending operation may be difficult. .

Further, in the case of a bending mechanism using a shape memory alloy as disclosed in JP-A-59-97115 and JP-A-1-95901, for example, an elastic drive member or a shape memory wire and an operation provided on a hand side are provided. Since the switch and the power supply are connected via lead wires, it is difficult to perform a bending operation like a bending mechanism using an angle wire even when the insertion section is bent to match the shape of the body cavity. Can be prevented.

However, in this case, it has been difficult to connect by welding between a shape memory alloy component such as a stretchable driving member or a shape memory wire made of a shape memory alloy and a lead wire. Therefore, when connecting the shape memory alloy component and the lead wire, a ring-shaped caulking member is generally provided, and the shape memory alloy component and the lead wire are inserted into the ring of the caulking member, and caulked in a state where they are superimposed. By crushing and crimping the member, a connection is made between the shape memory alloy part and the lead wire. Therefore, in this case, since the outer diameter of the connection portion between the shape memory alloy component and the lead wire becomes large, for example, the shape memory alloy component is attached to the distal end of the insertion portion of an insertion tool such as an endoscope. When the mounting hole is formed and the shape memory alloy component is mounted in the mounting hole, there is a problem that it becomes difficult to insert the shape memory alloy component into the mounting hole.

In addition, it is conceivable that the shape memory alloy component can be easily inserted into the mounting hole by increasing the diameter of the mounting hole, but in this case, it is difficult to fix the shape memory alloy component to the inner wall surface or the like of the mounting hole. In addition, there is a problem that the shape memory alloy component once fixed is easily detached.

The present invention has been made by paying attention to the above circumstances, and it is possible to easily insert a bending operation wire made of a shape memory material into a mounting hole, and the bending operation wire of the inserted mounting hole is attached to an inner wall surface or the like. An object of the present invention is to provide a bending operation device for a tubular insertion tool, which can be easily fixed and can prevent a bending operation wire once fixed from coming off easily.

[Means for Solving the Problems] The present invention forms a bending operation wire made of a linear shape memory material, the length of which is reduced by heating, into an elongated shape.
A mounting hole for the bending operation wire is formed in the tube wall portion of the flexible tubular insertion tool along the axial direction, and fixing portions for the bending operation wire are provided at least at two places before and after the mounting hole. And a connecting portion with a lead wire for supplying electricity to the bending operation wire is provided at one fixed portion of the bending operation wire, and the connection portion is inserted into a position corresponding to the connection portion on the outer peripheral surface of the tube wall portion. A side hole to be fixed by is formed.

[Operation] The diameter of the mounting hole is increased by fixing the connecting portion between the one fixing portion of the bending operation wire and the lead wire in the inserted state in the side hole formed on the outer peripheral surface of the tube wall of the tubular insertion tool. In addition, the bending operation wire made of the shape memory material is easily inserted into the mounting hole, and the inserted bending operation wire is easily fixed in the mounting hole, so that the once fixed bending operation wire is hardly detached. Things.

[Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a schematic configuration of a main part of the medical catheter (tubular insert) 1 shown in FIG. The main body 1a of the catheter 1 is formed of a substantially circular tubular body (multi-routine tube).

In FIG. 2, reference numeral 2 denotes an insertion portion of the catheter 1. A balloon 3 formed of a bag-shaped elastic body is mounted on the outer peripheral surface of the distal end portion of the insertion section 2.

Further, a proximal end 4 is provided at a proximal end of the insertion portion 2. A connecting end 6 of the tube 5 and a connecting end 8 of a cable 7 described later are provided on the outer peripheral surface of the proximal end 4.
Are provided respectively. One end of the tube 5 is connected to the balloon 3. In addition, this tube 5
A syringe 9 for supplying a fluid such as physiological saline into the balloon 3 is detachably connected to the base end of the syringe 3.

An endoscope insertion port 10 is provided on the end face of the proximal end 4. The insertion section 12 of the vascular endoscope 11 formed by, for example, an electronic endoscope is inserted from the endoscope insertion port 10 into the tube of the catheter body 1a. The insertion portion 12 of the blood vessel endoscope 11 is formed by connecting a distal end component 14 to a distal end of a flexible tube 13. Furthermore, one end of each of universal cords 16 and 17 is connected to the proximal operation section 15 on the base end side of the insertion section 12. The other end of one universal cord 16 is connected to a light source device 19 via a connector 18 and the other universal cord 17
Is connected to the TV camera unit 21 via the connector 20.
It is connected to the. A television monitor 22 is connected to the television camera unit 21.

On the other hand, a curved portion 23 is provided at the distal end of the insertion portion 2 in the catheter body 1a. The bending portion 23 is configured as shown in FIG.

That is, a pair of bending operation wire mounting holes 24a, 24b are juxtaposed in parallel in the proximity state on the distal end surface of the tube wall of the insertion section 2. These bending operation wire mounting holes 24a, 24b extend in the axial direction. A bending operation wire 25 is inserted into these bending operation wire mounting holes 24a and 24b.

The bending operation wire 25 is formed of a shape memory material such as a linear shape memory alloy. This bending operation wire
The 25 shape memory alloys have, for example, a bidirectional shape memory effect. The bending operation wire 25 is formed by forming a wire whose length is contracted by heating into an elongated shape.

That is, the bending operation wire 25 has a first memory shape (initial wire shape) on the high temperature side having a length L ₀ and a length dimension
The second memory shape (forced extension wire shape) on the low temperature side of L ₁ (L ₁ = L ₀ + ΔL) is stored. In this case, the shape memory alloy of the bending operation wire 25 is subjected to the shape memory processing on the high temperature side in the first memory shape on the high temperature side, and then is forcibly expanded into an elongated shape at room temperature, for example, about the body temperature, and the second memory shape on the low temperature side. Shape memory processing of the second memory shape is performed. Then, in a state where the bending operation wire 25 subjected to the two-way shape memory processing is held in the second storage shape, the bending operation wire 25 is heated to a transformation temperature of, for example, about 60 to 90 ° C. or higher. the, so as to deform the first memory shape of the high-temperature side of the length dimension L ₀ (heat shrinkage wireform) (shape recovery).

As shown in FIGS. 3 and 4, the bending operation wire 25 is folded from a substantially central portion, and the folded wire components 25a and 25b on both sides thereof are inserted into the mounting holes 24a and 24b, respectively. . Then, the center folded portion 25c of the bending operation wire 25 is fixed at the distal end face of the tube wall of the insertion portion 2, and a front end fixing portion 26 of the bending operation wire 25 is formed. Further, the lead wires 27a, 2 for energizing are provided at the respective distal ends of the two folded wire components 25a, 25b of the bending operation wire 25.
Each end of 7b is connected. A ring-shaped caulking member 28 is used for the connection portion A.

That is, as shown in FIG. 3, an L-shaped bent portion at each end of the folded wire components 25a and 25b and an L-shaped bent portion at each end of the lead wires 27a and 27b are provided in the ring of the caulking member 28. Are inserted and polymerized, and in this state, the caulking member 28 is crushed and caulked. In this state, the distal ends of the folded wire components 25a and 25b and the one ends of the lead wires 27a and 27b are electrically connected.

Further, on the outer peripheral surface of the tube wall portion of the insertion portion 2, an L-shaped bent portion at each end of the folded wire components 25a and 25b and a lead wire 27 are provided.
Side holes 29 are formed at positions corresponding to the connection portions between the one ends of the a and 27b and the L-shaped bent portion. The connecting portions A, A between the L-shaped bent portions at the respective ends of the folded wire components 25a, 25b connected by the crushing of the caulking member 28 and the L-shaped bent portions at the respective ends of the lead wires 27a, 27b are formed. Each of these side holes 2
The bending operation wire 25 is inserted into the inside of the bending operation wire 25, and is fixed by the adhesive S in this inserted state.

Note that, for example, a cap (not shown) is attached to the distal end surface of the insertion portion 2, and the cap covers the front end fixing portion 26 of the bending operation wire 25.

The other end of each of the lead wires 27a and 27b is
5 is connected to an energization amount control unit 31 that controls the energization amount. The power supply controller 31 is connected to the catheter body 1a via the cable 7. Further, an operation unit 33 is connected to the energization amount control unit 31 via a cable 32. The operation unit 33 is formed by, for example, a joystick. The joystick 34 can be moved in one direction, for example, and is normally held at a predetermined reference position.

Further, the controller for the bending operation wire 25 is built in the energization amount control unit 31. This controller is provided with a variable resistor and a switch connected to a power supply, respectively, and operates the joystick 34, that is, a movement of the joystick 34 from a reference position and a switch and a variable resistor of the controller according to the amount of movement. Is operated, and the amount of bending of the bending portion 23 of the catheter body 1a can be arbitrarily operated in a state corresponding to the amount of movement of the joystick 34.

 Next, the operation of the above configuration will be described.

First, the joystick 34 of the catheter 1 is normally held at the reference position. In this state, the switch of the controller of the power supply amount control unit 31 is held in the off state, so that
The bending operation wire 25 attached to the bending portion 23 of the insertion section 2 is held in a state where power is not supplied. Therefore, the bending operation wire 25 is held at a low temperature side of because it is held in the second memory shape, generally straight regular shape state the curved portion 23 of the insertion portion 2 is not curved length dimension L ₁ You.

In addition, when the vascular endoscope 11 is used, as shown in FIG.
Is inserted into. In this case, the balloon 3 is used to fix the insertion section 2 in the blood vessel 38.

When the balloon 3 is used, a syringe 9 is connected to the proximal end of the tube 5, and a fluid such as a physiological saline solution is supplied from the syringe 9 into the bag of the balloon 3 through the tube 5. Therefore, the balloon 3 is inflated by the supply of the fluid, and the inflated balloon 3 is pressed against the inner wall surface of the blood vessel 38. In this state, the insertion portion 2 of the catheter 1
It is fixed at a predetermined position in 38.

Then, in this state, the insertion section 12 of the vascular endoscope 11 is inserted from the endoscope insertion port 10 of the catheter 1 into the tube of the catheter body 1a.

When the distal end component 14 of the blood vessel endoscope 11 is directed in a desired direction such as the thrombus 39 in the blood vessel 38, the bending section 23 of the catheter 1 is operated to bend. The joystick 34 is used for the bending operation of the bending portion 23 of the catheter 1. In this case, the joystick 34 is operated to move by an arbitrary amount in one direction from the reference position. Then, the switch of the controller and the variable resistor are appropriately operated in accordance with the operation amount of the joystick 34. That is, when the joystick 34 is operated, the switch of the controller is turned on, and the variable resistor of the controller is moved to a predetermined position in accordance with the amount of movement of the joystick 34 at this time. Then, in accordance with this operation, the bending operation wire 25 connected to the controller is energized and heated.

Furthermore, energization heated bending operation wire 25 is deformed into the first memory shape of the high temperature side, for example, the length dimension L _0, the length of the bending operation wire 25 is contracted. Therefore, in this state, the bending portion 23 of the insertion portion 2 is pulled by the bending operation wire 25 to contract the front end fixed end portion 26 of the bending operation wire 25 with respect to the fixing portions 30 and 30 on the rear end side. Part 23
Is bent toward the bending operation wire 25 whose front end side contracts. In this case, the bending amount of the bending portion 23 is determined by the joystick.
Movement amount of 34, that is, appropriately set in accordance with the moving operation of the variable resistor controller, the low-temperature side of the second memory shape and the length of the deformable range (length L ₁ of the bending operation wire 25 range) in between the hot side of the first memory shape of L _0, are enabled set arbitrarily.

When the joystick 34 is returned to the reference position,
The variable resistor of the controller is returned to the predetermined return position, the switch is turned off, and the heating of the bending operation wire 25 connected to the controller is stopped.
Therefore, the temperature of the bending operation wire 25 is reduced in this state, since the bending operation wire 25 deflated returns to the second memory shape of the cold side of length L _1, of the bending operation wires 25 deflated Bending portion 23 of insertion portion 2 due to shape return operation
Is returned to a normal shape that is substantially straight without being curved.

Therefore, in the above configuration, side holes 29, 29 are provided on the outer peripheral surface of the tube wall of the insertion section 2 of the catheter 1, and the caulking member 2 is provided.
Folded wire components 25 connected by crushing of 8
a, 25b and the connecting portion A between the L-shaped bent portion at one end of each of the lead wires 27a, 27b and the L-shaped bent portion at one end of each of the side holes 29, 29
Since it is fixed in the inserted state inside, the bending operation wire mounting hole 24
The hole diameter of the bending operation wire 25 made of a shape memory material is increased by increasing the hole diameter of the
Even in the case where insertion into the bending operation wires 25 is facilitated, the folded wire components 25a and 25b of the inserted bending operation wire 25 can be easily fixed in the mounting holes 24a and 24b. Therefore, the work of attaching the bending operation wire 25 can be facilitated as compared with the related art. Further, it is possible to make the bending operation wire 25 once fixed harder to come off than in the past.

FIG. 6 shows a second embodiment of the present invention.

This is because a pair of bending operation wire mounting holes 24a and 24b are respectively extended along the circumferential direction at equal intervals (90 ° intervals) at four locations along the circumferential direction on the distal end surface of the tube wall of the insertion portion 2. The bending operation wire 25 is inserted into these bending operation wire mounting holes 24a and 24b.
In which the folded wire components 25a and 25b are inserted. In this case, the L-shaped bent portions at the tips of the folded wire constituent portions 25a, 25b of the four bending operation wires 25 and the L-shaped bent portions at the respective ends of the lead wires 27a, 27b are pressed together by the crushing of the caulking member 28. Connected, these connections
A and A are inserted and fixed in respective side holes 29 and 29 formed in the outer peripheral surface of the tube wall of the insertion section 2 of the catheter 1.

Further, the joystick 34 of the operation unit 33 can be moved, for example, back and forth and left and right, and is normally in a neutral position,
That is, it is held at the center position of this moving trajectory.

Each controller of four bending operation wires 25 attached to the bending portion 23 of the insertion portion 4 at four locations at 90 ° intervals is built in the power supply amount control portion 31. Each controller is provided with a variable resistor and a switch connected to a power supply.The operation of the joystick 34, that is, the switch and the switch of each controller according to the moving direction and the moving amount from the neutral position of the joystick 34, The variable resistor is appropriately switched, and the bending direction and the bending amount of the bending portion 23 of the catheter main body 1a can be arbitrarily operated in a state corresponding to the moving direction and the moving amount of the joystick 34.

Therefore, also in this case, side holes 29, 29 are provided in the outer peripheral surface of the tube wall of the insertion section 2 of the catheter 1, and the L-shaped ends of the folded wire components 25a, 25b connected by crushing of the caulking member 28 are formed. L at each end of the bent portion and each of the lead wires 27a and 27b
Since the connecting portions A, A to the character-shaped bent portion are inserted and fixed in the side holes 29, 29, the same effect as in the above embodiment can be obtained.

FIG. 7 shows a third embodiment of the present invention.

This is provided with a multi-joint type bending portion 43 in which a bending operation wire 41 made of a shape memory alloy and a lead wire 42 are alternately connected at the distal end portion of the insertion portion 2 of the catheter 1, and each bending operation wire 41 and a lead The joints A with the wires 42 are connected by ring-shaped caulking members 44 and the joints A between the bending operation wires 41 and the lead wires 42 on the outer peripheral surface of the tube wall of the insertion portion 2.
Side holes 45 are formed at positions corresponding to, and the joints A between the bending operation wires 41 and the lead wires 42 connected by the caulking members 44 are inserted into these side holes 45. It is fixed by an adhesive S. Insertion section 2
A coating portion 46 of the bending operation wire 41 in which the adhesive S is raised is formed on the distal end surface of the bending operation wire 41.
Is embedded in the covering portion 46. Note that 47
Is a bending operation wire mounting hole.

Therefore, in this case, the joints A between the bending operation wires 41 and the lead wires 42 forming the articulated bending portion 43 are connected to the side holes 45 formed on the outer peripheral surface of the tube wall of the insertion portion 2. And fixed by the adhesive S.
The same effect as that of the embodiment can be obtained.

FIGS. 8 and 9 show a fourth embodiment of the present invention.

This is achieved by providing ring-shaped projecting portions 51 and 52 which can be melted by heat as shown in FIG. 8 around the bending operation wire mounting hole 47 on the distal end surface of the insertion portion 2 of the third embodiment. After the operation wire 41 is mounted, the projecting portions 51 and 52 are heat-fused to form a covering portion 53 of the bending operation wire 41 as shown in FIG.

FIG. 10 and FIG. 11 show a fifth embodiment of the present invention.

This is because a side hole 54 communicating with the bending operation wire mounting holes 24a and 24b is provided on the outer peripheral surface of the distal end portion of the insertion portion 2 of the first embodiment, and a central folded portion of the bending operation wire 25 is provided in the side hole 54.
25c is inserted. In this case, a chamfered portion 55 is formed at the tip of the insertion portion 2.

FIG. 12 shows a sixth embodiment of the present invention.

This is an application of the present invention to a blood vessel endoscope 61. That is, a bending section 63 having the same configuration as the bending section 23 of the catheter 1 of the first embodiment is provided at the distal end of the insertion section 62 of the blood vessel endoscope 61. Further, one end of each of universal cords 65 and 66 is connected to an operation section 64 provided at the base end of the insertion section 62 of the blood vessel endoscope 61. The other end of one universal cord 65 is connected to a light source device 68 via a connector 67, and the other universal cord 66
Is connected to the TV camera unit 70 via a connector 69.
It is connected to the. A television monitor 71 is connected to the television camera unit 70. Further, a power supply controller 73 is connected to the light source device 68 via a cable 72. For example, the joystick 74
Is connected. Also in this case, the bending portion 63 at the distal end of the insertion portion 62 is bent by the joystick 74 similarly to the first embodiment, and the bending amount can be arbitrarily operated in a state corresponding to the movement amount of the joystick 74. ing.

Therefore, also in this case, the distal end portion of the insertion portion 62 has a curved portion 63 having the same configuration as the curved portion 23 of the catheter 1 of the first embodiment.
Is provided, the same effects as in the first embodiment can be obtained.

FIG. 13 shows a seventh embodiment of the present invention.

This is an application of the present invention to a laser probe 81. That is, a bending portion 82 having the same configuration as the bending portion 23 of the catheter 1 of the first embodiment is provided at the distal end of the laser probe 81. In addition, this laser probe 81
Laser device such as the proximal end for example a YAG laser, CO ₂ laser
Connected to 83. Further, a current control unit 85 is connected to a base end of the laser probe 81 via a cable 84. An operation unit 87 formed by, for example, a joystick 86 is connected to the energization amount control unit 85.
And also in this case, the curved portion 82 at the tip of the laser probe 81
Is operated by the joystick 86 in the same manner as in the first embodiment, and the amount of bending can be arbitrarily operated in a state corresponding to the amount of movement of the joystick 86.

Therefore, also in this case, since the bending portion 82 having the same configuration as the bending portion 23 of the catheter 1 of the first embodiment is provided at the distal end of the laser probe 81, the same effect as that of the first embodiment is obtained. be able to.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] According to the present invention, a bending operation wire which is made of a linear shape memory material and whose length is contracted by heating is formed in an elongated shape, and is provided on a tube wall portion of a flexible tubular insertion tool. A mounting hole for the bending operation wire is formed along the axial direction, and a fixing portion for the bending operation wire is provided at least at two places before and after the mounting hole, and the bending portion is provided on one fixing portion of the bending operation wire. A connection portion with a lead wire for supplying electricity to the operation wire is provided, and a side hole for fixing the connection portion in an inserted state is formed at a position corresponding to the connection portion on the outer peripheral surface of the tube wall portion. The bending operation wire can be easily inserted into the mounting hole, and the bending operation wire of the inserted mounting hole can be easily fixed to the inner wall surface or the like. can do.

[Brief description of the drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a sectional perspective view showing a schematic configuration of a main part, and FIG. 2 is a schematic configuration showing an entire use state of a catheter. Figure, third
The figure is a perspective view showing the connection state between the bending operation wire and the lead wire for energization, FIG. 4 is a longitudinal sectional view showing the front end fixing portion of the bending operation wire, FIG. 5 is a plan view showing the distal end surface of the catheter,
FIG. 6 is a plan view showing a distal end surface of a catheter according to a second embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a main part showing a third embodiment of the present invention. Is the fourth of the present invention.
FIG. 8 is a longitudinal sectional view showing a state before heat fusion of a heat fusion portion of a distal end surface of a catheter, FIG. 9 is a longitudinal sectional view showing a heat fusion state of a heat fusion portion, FIG. Fig. 10 and 11
Fig. 10 shows a fifth embodiment of the present invention. Fig. 10 is a longitudinal sectional view of a main part, Fig. 11 is a plan view showing a side hole of a front end fixing part, and Fig. 12 is a sixth embodiment of the present invention. FIG. 13 is an overall schematic configuration diagram showing a seventh embodiment of the present invention. 1,42,53 …… Medical catheter (tubular insert), 24a, 24b
…… Bending operation wire mounting holes, 25,41 …… Bending operation wires, 26 …… Front end fixing parts, 27a, 27b, 42 …… Electrification lead wires, 29 …… Side holes, 30 …… End fixing parts, A …… Connections, 61
... angioscopy (tubular insert), 81 ... laser probe (tubular insert).

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Sakae Takehata 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside O-Limpus Optical Co., Ltd. (72) Inventor Takeaki Nakamura 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Inside Olympus Optical Co., Ltd. (72) Inventor Akifumi Ishikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (56) References JP-A-62-26041 (JP, A) JP-A-59-48710 (JP, A) JP-A-63-21066 (JP, A) JP-A-60-237210 (JP, A) JP-A-62-227313 (JP, A) JP-A-59-97115 (JP, A) Japanese Utility Model 1-95901 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61B 1/00

Claims (1)

(57) [Claims] 1. A bending operation wire made of a linear shape memory material and having a length reduced by heating, is formed in an elongated shape.
A mounting hole for the bending operation wire is formed in the tube wall portion of the flexible tubular insertion tool along the axial direction, and fixing portions for the bending operation wire are provided at least at two places before and after the mounting hole. And a connecting portion with a lead wire for supplying electricity to the bending operation wire is provided at one fixed portion of the bending operation wire, and the connection portion is inserted into a position corresponding to the connection portion on the outer peripheral surface of the tube wall portion. A bending operation device for a tubular insertion tool, characterized in that a side hole to be fixed is formed.