JPH0761308B2 - Endoscope treatment tool insertion channel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a treatment instrument insertion channel which is incorporated in an insertion portion of an endoscope and which allows various treatment instruments to be inserted therethrough.

[Prior Art] An endoscope is configured by connecting an insertion portion to be inserted into a body cavity or the like to an operation portion and a universal cord connected to a light source device. The insertion part in the above comprises a light guide and the like, and is provided with an irradiation means for irradiating the observation target portion with illumination light, and an image guide or a fixed image sensor for observing the observation target portion. An observation means is built in, and a treatment instrument insertion channel for inserting a treatment instrument such as forceps in order to collect cells or perform treatment is provided.

Here, as the treatment instrument inserted through the above-mentioned treatment instrument insertion channel, there is a treatment instrument such as a high-frequency knife, a high-frequency snare, a high-frequency biopsy forceps, etc. for energizing a high-frequency current, and when such a treatment instrument is used, In order to ensure safety, the endoscope and the treatment tool themselves are insulated. However, when high-frequency current is applied,
If the leaked electromagnetic wave leaks from a treatment tool such as a high-frequency snare, and the leaked electromagnetic wave is caught by a metal member such as a screw tube or a net at the insertion part, the patient or endoscope is operated when insulation is defective. It will be very dangerous because the person will get an electric shock. In addition, in particular, in recent years, as an observing means, a solid-state image sensor such as a CCD mounted on the tip of the insertion part of the endoscope is used to form an optical image of the observation target part by this solid-state image sensor. In such an electronic endoscope, if there is an extremely weak leak current, noise with respect to the above-mentioned signal is generated and the monitor image at the time of processing is disturbed. From this viewpoint as well, it is necessary to secure a reliable return path for the leak current.

In consideration of such circumstances, a leak current feedback member is configured by embedding a metal having good conductivity in the tube forming the treatment instrument insertion channel or winding a metal blade around the outer circumference of the tube. The leak current feedback member is conventionally used to feed back the leak current to the power supply unit.

[Problems to be Solved by the Invention] With the above-described configuration, the leakage current can be returned and the safety is improved. The size of the treatment instrument insertion channel must be increased to a certain extent, which makes the overall shape of the treatment instrument insertion channel thick, which makes it impossible to reduce the diameter of the insertion portion and also increases the rigidity of the treatment instrument insertion channel. There is a drawback in that the strength of the insertion part becomes strong and the operability of inserting the insertion part into the body cavity or the like becomes poor.

The present invention has been made in view of the above points, and an object of the present invention is to reliably return a leak current to a power supply unit without impairing the originally function of the treatment instrument insertion channel. Another object of the present invention is to provide a treatment tool insertion channel of an endoscope which is capable of performing the above.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is a conductive tape in which a metal foil is adhered to a base tape having an electric insulation property, and a metal vapor deposition film is formed on the metal foil. The tape is wound around the outer periphery of the hermetic layer in a state where the vapor-deposited film forming surface is inside and partially overlapped with each other to form a conductive layer for returning a leak current to the power supply unit. It is a feature.

[Operation] As described above, since the conductive tape formed by forming the metal foil and the metal vapor deposition film on the base tape is used, the conductive tape can be formed thin and the conductive tape can be formed on the airtight layer. It can be easily wrapped. Since the conductive tape has a double conductive portion composed of a metal foil made of aluminum or the like, copper or the like, and a metal vapor-deposited coating, the electrical resistance becomes extremely low, and when a treatment tool for passing a high frequency current is used. Even if a leak current is generated by the electromagnetic waves generated during energization, the leak current can be reliably and completely returned to the power supply unit.

Furthermore, since the vapor-deposited metal coating on the conductive tape is formed on the metal foil, the coating can be easily formed and its thickness can be made uniform. It is possible to strictly control the overall thickness of the adhesive tape. Therefore, by controlling the thickness of this metal vapor deposition coating, it becomes possible to impart a desired rigidity to the entire treatment instrument insertion channel, and when the treatment instrument is mounted and used in the insertion section, There is no occurrence of so-called kinking or the like in which the insertion channel is twisted or bent and crushed, and the durability is excellent and the operability of the insertion operation is not lowered due to excessive rigidity.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

First, in FIG. 1, reference numeral 1 denotes an operation section of an endoscope, which is connected to an insertion section 2 to be inserted into a body cavity or the like of a patient P and a light source device 3 having a light source or the like built therein. The universal cord 4 is connected. A light guide 5 for irradiating the affected area with illumination light and an image guide 6 for transmitting an image of the affected area are provided between the operation section 1 and the tip 2a of the insertion section 2. An operation wire 7 for operating the distal end portion 2a of the insertion portion 2 in an angle is incorporated. Furthermore, a treatment instrument insertion channel 9 for inserting a treatment instrument 8 for performing a predetermined treatment on the affected area is provided. The treatment instrument 8 is capable of performing incision or excision of the affected part by passing a high frequency current, and for this reason, the treatment instrument 8 is connected to one electrode 10a of the high frequency power supply 10. Further, the other electrode 10b of the high frequency power source 10 is connected to the patient electrode 11 which is brought into contact with the body of the patient P.

Thus, when the above-described treatment instrument 8 for flowing a high-frequency current is used, a leak current may occur due to incomplete shielding of the electromagnetic waves of the treatment instrument 8 or the like. However, it is extremely dangerous because it causes burns in a portion other than the affected portion where the leaked portion comes into contact, and electric shock is given to a person who operates the endoscope. In addition, in the electronic endoscope, noise may occur with respect to a signal transmitted / received between the solid-state imaging device provided at the tip of the insertion portion 2 and the image processing device incorporated in the light source device 3. For this reason, the treatment instrument insertion channel 9 has a structure capable of returning the electromagnetic waves leaking from the treatment instrument 8 to the high frequency power source 10, as shown in FIG.

That is, as is clear from the figure, the treatment instrument insertion channel 9 has a porous tube 12 made of fluororesin or the like as an innermost layer, and an airtight layer 13 formed of fluororubber or the like on the outer periphery of the tube 12 as an intermediate layer. A conductive layer outside the hermetic layer 13
14 is formed, and an insertion passage 15 for the treatment instrument 8 is formed inside the tube 12.
The conductive layer 14 has an electrically insulating property such as polyester and polyethylene as shown in FIG.
Moreover, a metal foil 18 having good conductivity such as aluminum is laminated on one side of the base tape 16 made of a resin material having good slipperiness via an adhesive layer 17, and further copper or the like is formed on the metal foil 18. A conductive tape 20 having a metal vapor deposition coating 19 formed thereon is used, and the surface of the metal vapor deposition coating 19 is directed inward, and the conductive tape 20 is placed on the airtight layer 13 in a partially overlapped state with each other. It is formed by winding on. Then, in order to fix the conductive tape 20 in a state of being in close contact with the airtight layer 13, after forming the airtight layer 13 on the tube 12, and further winding the conductive tape 20,
When the airtight layer 13 is vulcanized by heating, the conductive tape
20 will be fixed to the airtight layer 13.

Then, the lead wire 21 is connected to the conductive layer 14 in the treatment instrument insertion channel 9 configured as described above, and the other end of the lead wire 21 is guided into the universal cord 4 to generate the universal cord. It is connected to the terminal 22 provided on the No. 4. The terminal 22 is connected to the electrode 10b of the high frequency power supply 10 by a lead wire 23, so that the leak current can be fed back to the high frequency power supply 10. In addition, an insulating member 24 is provided between the treatment instrument insertion channel 9 and the casing 1a and other portions in order to prevent the leakage current from being charged in the casing 1a of the operation portion 1.

The present embodiment is configured as described above, and its operation will be described next.

In order to perform inspection / diagnosis or treatment in the body cavity of the human body using the endoscope described above, the insertion portion 2 is inserted from the oral cavity or nasal cavity, and the target of predetermined observation / treatment. Lead the tip 2a to the part. When the insertion portion 2 is inserted along the insertion path, the insertion portion 2 must bend so as to follow the insertion path. The channel 9 includes the tube 12, the airtight layer 13, and the base tape 1.
6, a conductive tape 20 comprising a metal foil 18 and a metal vapor deposition coating 19
It is possible to give desired flexibility to the treatment instrument insertion channel 9 by selecting each of these constituent members from those having appropriate hardness, and the body cavity of the insertion portion 2 can be provided. The operability of the insertion operation in the inside becomes good.

Here, the treatment instrument insertion channel 9 is required to have not only the flexibility described above, but also a so-called endurance member that holds the treatment instrument insertion channel 9 so as not to be crushed by being twisted or pressed when it is bent. The kink property is good, the treatment instrument insertion channel 9 has a restoring force for bending, and the elastic force at the time of this restoring is weakened to some extent, so that the insertion portion 2
It is necessary to protect other internal components such as the light guide 5 and the image guide 6 from being pressed. Thus, since the conductive tape 20 has the metal foil 18 and the metal vapor deposition film 19, these, especially the metal vapor deposition film 19 are used.
By controlling the thickness of the kink, the kink resistance can be improved. Further, as compared with the case where a stainless steel blade or the like is used as the conductive layer, the elastic force at the time of restoration to bending can be weakened, and the internal component of the insertion portion 2 can be protected.

When the insertion portion 2 is guided to a site to be observed or treated and the affected area is excised as described above, the treatment instrument 8 such as a high frequency knife or a high frequency snare is inserted into the treatment instrument insertion channel 9. Then, by leading the distal end of the treatment tool 8 from the distal end portion 2a of the insertion portion 2 and turning on the high-frequency power source 10, it becomes possible to perform treatment such as incision and excision of the affected area. Then, even if an electromagnetic wave is generated while using the treatment instrument 8 that passes this high frequency, the treatment instrument insertion channel 9
Since a conductive layer 14 is provided in the structure, and the conductive layer 14 has a structure having a two-layered conductive portion of a metal foil 18 and a metal vapor deposition coating 19, this electromagnetic wave is reliably generated by this conductive layer 14. Will be captured by and will be returned to the high-frequency power source 10 via the lead wire 21 as a leak current, which will cause burns in a site other than the affected area, or a person who operates the endoscope will be electrocuted. There is no danger of danger, and in addition, in the electronic endoscope, it is possible to prevent the generation of noise with respect to the signal.

Then, as the conductive layer 14, for example, a base tape made of polyester having a thickness of about 6 μm is coated with an adhesive agent of about 1 μm, and an aluminum foil of 7 μm is bonded through this adhesive agent. If you use 1μ of copper vapor deposited on the top, the electrical resistance will be about 0.6Ω / m and you will be able to fully demonstrate the feedback action of leak current, and the kink of the treatment instrument insertion channel. The prevention effect is good, and the total thickness of the conductive layer 14 is 15
Since it can be formed to have an extremely thin wall thickness of about μ, it is possible to suppress the filling rate of the internal components of the insertion portion 2.

[Effects of the Invention] As described in detail above, according to the present invention, a conductive tape having a two-layer conductive portion is formed by adhering a metal foil to a base tape and forming a metal vapor deposition coating on the metal foil. The conductive tape was used to form a conductive layer by winding the conductive tape around the outer periphery of the airtight layer in a state where the surface on which the vapor-deposited film is formed is partially overlapped with each other. It will be possible to reliably return to the power supply section, and by appropriately setting the material and thickness of the metal foil and the metal vapor deposition coating, kink resistance without increasing the diameter of the treatment instrument insertion channel The durability is improved, and further, it is possible to prevent various internal components from being pressed when restoring after being bent.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is a sectional view showing the main part of an endoscope, FIG. 2 is a half sectional view of a treatment instrument insertion channel, and FIG. 3 is a sectional view of a conductive tape. Is. 1: Operation part, 2: Insertion part, 8: Treatment tool, 9: Treatment tool insertion channel, 10: High frequency power supply, 12: Tube, 13: Airtight layer, 14: Conductive layer, 16: Base tape, 17: Adhesive Layer, 18: metal foil, 19: vapor-deposited metal coating, 20: conductive tape.

Claims (1)

[Claims] 1. A tube having a treatment tool insertion passage therein,
A treatment tool for an endoscope including an airtight layer formed on the outer circumference of the tube, and a conductive layer formed on the outer side of the airtight layer for returning a leak current from a treatment tool using a high frequency current to a power supply unit. In the insertion channel, a metal foil is adhered to an electrically insulating base tape, and a conductive tape having a metal vapor deposition coating formed on the metal foil is wound around the outer periphery of the airtight layer in a state of partially overlapping each other. The treatment instrument insertion channel of an endoscope, wherein the conductive layer is formed by