CN112386308B - Snare for endoscope - Google Patents
Snare for endoscope Download PDFInfo
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- CN112386308B CN112386308B CN202010817069.9A CN202010817069A CN112386308B CN 112386308 B CN112386308 B CN 112386308B CN 202010817069 A CN202010817069 A CN 202010817069A CN 112386308 B CN112386308 B CN 112386308B
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- snare
- wire
- endoscope
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- sheath
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- 238000009751 slip forming Methods 0.000 claims 1
- 208000037062 Polyps Diseases 0.000 abstract description 21
- 238000010008 shearing Methods 0.000 abstract description 12
- 230000004048 modification Effects 0.000 description 15
- 238000012986 modification Methods 0.000 description 15
- 238000002271 resection Methods 0.000 description 8
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 208000032843 Hemorrhage Diseases 0.000 description 2
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- 239000010936 titanium Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 206010051077 Post procedural haemorrhage Diseases 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 210000004876 tela submucosa Anatomy 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/3205—Excision instruments
- A61B17/32056—Surgical snare instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
- A61B2017/00292—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means
- A61B2017/00296—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery mounted on or guided by flexible, e.g. catheter-like, means mounted on an endoscope
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The invention provides a snare for an endoscope, which has a snare wire with improved shearing force when a polyp is resected. The snare for an endoscope is provided with: a sheath; a cable slidably inserted into the sheath in the extending direction of the sheath; and (5) looping wires. One end and the other end in the extending direction of the loop wire are connected to one end in the extending direction of the cable in a loop-forming manner. The snare wire has a first side, a second side connected to the first side, and a corner formed by the first side and the second side, when viewed in a cross section orthogonal to the extension direction of the snare wire. The corners face inward of the ring.
Description
Technical Field
The present invention relates to a snare for an endoscope. More particularly, the present invention relates to a snare for an endoscope which is inserted into a body through a forceps channel of the endoscope to catch/resect a tissue such as a polyp in a digestive tract.
Background
The excision of polyps and the like by a snare for an endoscope inserted into a body through a forceps channel of the endoscope is generally performed by twisting a root portion of the polyp and the like with a snare wire formed in a ring shape, and passing a high-frequency current through the snare wire. However, in this resection, there are cases where a long time observation is required after the operation because the blood vessel is ruptured by the burn of the resection site reaching the submucosa and bleeding after the operation is caused.
For this reason, a polyp cold resection may be selected in which a polyp or the like having a small size (for example, less than about 10 mm) is resected only by a root portion of the polyp or the like without conducting current. Polyp cold resection is a resection limited to mucous membranes, and is therefore perceived as a therapy in which there is less risk of post-operative bleeding, and a relatively high safety, and a faster cure, even if there is bleeding immediately after resection.
The snare wire in the snare for an endoscope described in japanese patent No. 4347584 has a triangular shape or a quadrangular shape in a cross-sectional view, and sides of the triangular shape or the quadrangular shape face the inside of a loop formed by the snare wire. From another point of view, the cut-out surface of the loop wire in the snare for an endoscope described in japanese patent No. 4347584 is formed of a flat surface.
In cold polypectomy, since excision of polyps and the like is performed only by twisting the root of the polyp and the like by the snare wire, the snare wire needs to have a shearing force. However, since the cut surface of the loop wire in the endoscope snare of japanese patent No. 4347584 is formed of a flat surface, there is room for improvement in shear force such as cutting polyps.
Disclosure of Invention
The present invention has been made in view of the above-described problems of the prior art. More specifically, the present invention provides a snare for an endoscope having a snare wire with improved shearing force for resecting polyps and the like.
An aspect of the present invention provides a snare for an endoscope, comprising: a sheath; a cable slidably inserted into the sheath in the extending direction of the sheath; and (5) looping wires. One end and the other end in the extending direction of the loop wire are connected to one end in the extending direction of the cable in a loop-forming manner. The snare wire has a first side, a second side connected to the first side, and a corner formed by the first side and the second side, when viewed in a cross section orthogonal to the extension direction of the snare wire. The corners face inward of the ring.
In the above-described snare for an endoscope, the corner portion may be formed continuously along the extending direction of the snare wire so as to extend over a part or the whole of the loop.
In the above-described snare for an endoscope, the loop may have a first portion and a second portion opposed to the first portion in a width direction of the loop. The corner may be formed in either one of the first portion and the second portion.
In the above-described snare for an endoscope, an angle formed by the first side and the second side may be 30 ° or more and 90 ° or less.
In the above-described snare for an endoscope, the snare wire may have a triangular shape when viewed from a cross section orthogonal to the extension direction of the snare wire. In the above-described snare for an endoscope, the length of one side of the triangle shape may be 0.1mm to 0.4 mm.
In the above-described snare for an endoscope, the ring may have a protrusion portion located at a tip end of the ring.
In the above-described snare for an endoscope, the shape of the ring may be any one of a circle, an ellipse, a tear drop, a diamond, and a hexagon in a state in which the ring is expanded.
In the above-described snare for an endoscope, the corner portion may be chamfered. In the above-described snare for an endoscope, the loop wire may be a single strand wire. In the above-described snare for an endoscope, the loop wire may be a wire made of a super elastic alloy.
The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a plan view of an endoscopic snare 10.
Fig. 2 is a cross-sectional view of the snare wire 3 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3 in the snare 10 for an endoscope.
Fig. 3 is a plan view of the snare 10 for an endoscope in a state where the ring 31 is contracted.
Fig. 4 is a plan view of the snare wire 3 in the snare 10A for an endoscope.
Fig. 5 is a plan view of the snare wire 3 in the first modification of the snare 10A for an endoscope.
Fig. 6 is a plan view of the snare wire 3 in the second modification of the snare 10A for an endoscope.
Fig. 7 is a plan view of a snare wire 3 in a third modification of the snare 10A for an endoscope.
Fig. 8 is a cross-sectional view of the snare wire 3 in the endoscope snare 10B as seen from a cross-section orthogonal to the extending direction of the snare wire 3.
Fig. 9 is a cross-sectional view of the snare wire 3 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3 in the first modification of the snare 10B for an endoscope.
Fig. 10 is a cross-sectional view of the snare wire 3 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3 in the second modification of the snare 10B for an endoscope.
Fig. 11 is a cross-sectional view of the snare wire 3 in the endoscope snare 10C as seen from a cross-section orthogonal to the extending direction of the snare wire 3.
Fig. 12A is a first cross-sectional view of the snare wire 3 in the endoscope snare 10D as seen from a cross-section orthogonal to the extending direction of the snare wire 3.
Fig. 12B is a second cross-sectional view of the snare wire 3 in the endoscope snare 10D as seen from a cross-section orthogonal to the extending direction of the snare wire 3.
Detailed Description
Details of the embodiments are described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and repetitive description thereof will not be repeated.
(First embodiment)
The snare for an endoscope (hereinafter referred to as "snare for an endoscope 10") of the first embodiment will be described below.
< Construction of snare for endoscope 10 >
Fig. 1 is a plan view of an endoscopic snare 10. As shown in fig. 1, the snare 10 for an endoscope includes a sheath (length) 1, a cable 2, a snare wire (SNARE WIRE) 3, and a handle operation portion 4. The snare 10 for an endoscope is inserted into a body through a forceps channel (not shown) of the endoscope to be used.
The sheath 1 is a tubular member. That is, the inside of the sheath 1 is hollow. The sheath 1 has a first end 1a and a second end 1b. The first end 1a and the second end 1b are ends of the sheath 1 in the extending direction of the sheath 1. The second end 1b is the end on the opposite side of the first end 1 a.
Preferably, the sheath 1 is formed of a material having moderate flexibility and rigidity, low surface friction resistance, and low extensibility. The sheath 1 is formed of, for example, polypropylene, fluorine-based resin, or the like. The outer diameter and length of the sheath 1 are suitably chosen so as to be insertable into the forceps channel.
The cable 2 is a linear member. The cable 2 has a first end 2a and a second end 2b (not shown). The first end 2a and the second end 2b are ends of the cable 2 in the extending direction of the cable 2. The second end 2b is the end on the opposite side of the first end 2 a. The cable 2 is inserted into the sheath 1. The cable 2 is slidable within the sheath 1 in the extending direction of the sheath 1. The outer diameter of the cable 2 is smaller than the inner diameter of the sheath 1.
Preferably, the cable 2 is formed of a material having moderate flexibility and rigidity, low extensibility, and moderate torque. The cable 2 is formed, for example, by twisting a plurality of metal wires formed of stainless steel or the like.
The looper wire 3 is a linear member. The looper wire 3 has a first end 3a and a second end 3b. The first end 3a and the second end 3b are ends of the snare wire 3 in the extending direction of the snare wire 3. The second end 3b is the end on the opposite side of the first end 3 a. The first end 3a and the second end 3b of the looper wire 3 are connected to the first end 2a of the cable 2. This connection is performed, for example, by caulking via the pipe 21. Preferably, the snare wire 3 is electrically connected to the cable 2.
Preferably, the snare wire 3 is formed of a single strand of wire. Preferably, snare wire 3 is formed of a wire made of a superelastic alloy. Superelasticity refers to a property that, even after an external force of a degree that generates plastic strain is applied, if the external force is removed, the shape is reduced to an original shape, and superelastic alloy refers to an alloy having such a property. Nickel (Ni) -titanium (Ti) alloys are examples of super-elastic alloys.
The loop 31 is formed by connecting the snare wire 3 with the cable 2. The ring 31 protrudes from the sheath 1 (first end 1 a) in the expanded state. The ring 31 has a first portion 31a and a second portion 31b. The first portion 31a and the second portion 31b are opposed to each other in a first direction DR1 which is a direction along the width of the ring 31. The ring 31 also has a protrusion 31c. The projection 31c is located at the top end of the ring 31. The tip of the ring 31 is a portion of the ring 31 located at a position farthest from the first end 1a of the sheath 1 in the second direction DR2 orthogonal to the first direction DR 1.
The ring 31 has, for example, a diamond shape. Even when the corners in the first direction DR1 of the ring 31 are rounded, the case is included in the so-called "diamond shape" herein. The loop wire 3 is stored in advance so that the loop 31 has a predetermined shape. Further, the ring 31 deviates from a diamond shape at the portion where the protruding portion 31c is located. The ring 31 is still provided with a "diamond shape" even if it has such a protruding portion 31 c.
Fig. 2 is a cross-sectional view of the snare wire 3 in the endoscope snare 10 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3. As shown in fig. 2, the snare wire 3 has a first side 32, a second side 33, and a corner 34 when viewed in a cross section orthogonal to the extension direction of the snare wire 3. The second edge 33 is connected to the first edge 32. The corner 34 is formed by the connection of the second edge 33 to the first edge 32. Although not shown, the corner 34 is formed continuously along the extending direction of the snare wire 3 throughout the entire loop 31.
The corner 34 is not necessarily formed continuously along the extending direction of the snare wire 3 throughout the entire loop 31. The portions of the snare wire 3 in which the corner portions 34 are formed may be arranged so as to be separated from each other along the extension direction of the snare wire 3.
The snare wire 3 has, for example, a triangular shape when viewed from a cross section orthogonal to the extending direction of the snare wire 3. Preferably, the length of one side of the triangle is 0.1mm to 0.4 mm.
The corners 34 face inwards of the ring 31. The term "the corner 34 is directed inward of the ring 31" means that the angle formed by the normal line of the plane defined by the ring 31 and the bisector of the angle formed by the first side 32 and the second side 33 exceeds 45 °. The outer peripheral surface of the snare wire 3 facing the inside of the loop 31 becomes a resected surface for resecting a polyp or the like, but as a result of the corner 34 facing the inside of the loop 31, the corner 34 constitutes a part of the resected surface. The angle formed by the first side 32 and the second side 33 is set to be the angle θ. Preferably, the angle θ is 30 ° to 90 °. The angle θ is smaller than 180 °.
As shown in fig. 1, the handle operation section 4 includes: a sheath mount 41 and a cable mount 42. The sheath mount 41 has a first end 41a and a second end 41b. The first end 41a and the second end 41b are ends in the longitudinal direction of the sheath mount 41. The second end 41b is the end on the opposite side of the first end 41 a.
The second end 1b of the sheath 1 is connected to the first end 41a of the sheath holder 41. The sheath mount 41 has a grip ring 41c in the second end 41 b. The grip ring 41c is a portion for a user of the snare 10 for an endoscope to grip the sheath mount 41. In the grip ring 41c, for example, the thumb of the user who inserts the snare 10 for an endoscope is inserted.
The cable mount 42 is connected to the second end 2b of the cable 2. The cable holder 42 is configured to be relatively slidable with respect to the sheath holder 41 along the longitudinal direction of the sheath holder 41. The cable seat 42 has a grip ring 42a and a grip ring 42b. The grip ring 42a and the grip ring 42b are portions for gripping the cable mount 42 by a user of the snare 10 for an endoscope. The grip rings 42a and 42b are inserted with, for example, the index finger and middle finger (middle finger and ring finger) of the user of the snare 10 for an endoscope, respectively.
The cable mount 42 may also have a terminal 42c. The terminal 42c is electrically connected to the cable 2. A high-frequency current is supplied to the terminal 42c. The high-frequency current is supplied to the snare wire 3 via the wire 2. That is, the endoscope snare 10 may be configured to cut polyps or the like by twisting the polyps or the like around the snare wire 3 and simultaneously supplying a high-frequency current to the snare wire 3. From another perspective, the endoscopic snare 10 may also be used outside of a cold polypectomy.
< Action of snare for endoscope 10 >
Fig. 3 is a plan view of the snare 10 for an endoscope in a state where the ring 31 is contracted. As shown in fig. 3, the ring 31 is introduced into the sheath 1 to be reduced in diameter by relatively sliding the cable holder 42 with respect to the sheath holder 41 from the first end 41a side to the second end 41b side of the sheath holder 41. On the other hand, by relatively sliding the cable mount 42 from the second end 41b side to the first end 41a side with respect to the sheath mount 41, the ring 31 protrudes from the sheath 1 and is expanded, returning to the state shown in fig. 1.
The snare 10 for an endoscope is inserted into the vicinity of the target site by passing through the forceps channel of the endoscope in a state where the ring 31 is contracted. After the endoscope snare 10 is inserted in the vicinity of the target site, the ring 31 is protruded from the sheath 1 and expanded by sliding the cable mount 42 with respect to the sheath mount 41. In a state where the root portion of a polyp or the like is positioned in the expanded ring 31, the cable seat 42 is slid with respect to the sheath seat 41, and the ring 31 is introduced into the sheath 1 and contracted, thereby capturing/resecting the polyp or the like.
Effect of snare 10 for endoscope
The outer peripheral surface of the snare wire 3 facing the inner side of the loop 31 serves as a resection surface for resecting a polyp or the like, but in the snare wire 3, a corner 34 facing the inner side of the loop 31 when viewed in a cross section orthogonal to the extension direction of the snare wire 3 is formed, and therefore the corner 34 constitutes a part of the resection surface. Thus, in the snare for endoscope 10, the shearing force of the snare wire 3 is improved.
In the snare for an endoscope, in order to improve the shearing force of the snare wire, the diameter of the snare wire needs to be reduced. However, when the diameter of the snare wire is reduced, the rigidity of the snare wire is reduced (toughness of the snare wire is lost), and it is difficult for the snare wire to catch polyps or the like. In the snare 10 for an endoscope, since the snare wire 3 does not need to be thinned to lose toughness in order to increase the shearing force of the snare wire 3, it is easy to catch polyps and the like.
Further, according to the snare 10 for an endoscope, as a result of improving the shearing force of the loop wire 3, the fastening force required for cutting polyps or the like becomes small, and thus the load of the residual tissue at the cut site can be reduced.
When the angle θ is excessively large, the cut-away surface in the snare wire 3 becomes close to a plane, and thus the shearing force of the snare wire 3 decreases. On the other hand, if the angle θ is too small, the shearing force of the looper wire 3 increases, but breakage tends to occur at the corner 34, and the processing becomes difficult. Therefore, by setting the angle θ to 30 ° or more and 90 ° or less, it is possible to suppress breakage of the looper wire 3 while maintaining the shearing force and workability of the looper wire 3.
The thinner the snare wire 3 is, the higher the shearing force of the snare wire 3 is, but the lower the rigidity of the snare wire 3 becomes. Therefore, by setting the length of one side of the triangular cross-sectional shape of the snare wire 3 to 0.1mm to 0.4mm, the shearing force of the snare wire 3 can be maintained, and the rigidity (toughness) of the snare wire 3 can be maintained. In the case where the snare wire 3 is formed of a single strand wire, the rigidity of the snare wire 3 can be improved.
(Second embodiment)
The following describes a snare for an endoscope (hereinafter referred to as "snare 10A for an endoscope") according to a second embodiment. Here, points different from the snare 10 for an endoscope will be mainly described, and repetitive description will not be repeated.
< Construction of snare for endoscope 10A >
The snare 10A for an endoscope includes a sheath 1, a cable 2, a loop wire 3, and a handle operation portion 4. In this regard, the configuration of the snare for endoscope 10A is common to the configuration of the snare for endoscope 10.
Fig. 4 is a plan view of the snare wire 3 in the snare 10A for an endoscope. As shown in fig. 4, in the snare for endoscope 10A, the ring 31 has a circular shape. In this regard, the configuration of the snare for endoscope 10A is different from that of the snare for endoscope 10.
< Modification >
Fig. 5 is a plan view of the snare wire 3 in the first modification of the snare 10A for an endoscope. As shown in fig. 5, the ring 31 may also be elliptical in shape. Fig. 6 is a plan view of the snare wire 3 in the second modification of the snare 10A for an endoscope. As shown in fig. 6, the ring 31 may also be hexagonal in shape. The hexagonal shape has corners in the first direction DR1 of the diamond shape of the ring 31 shown in fig. 1 as being linear. Fig. 7 is a plan view of a snare wire 3 in a third modification of the snare 10A for an endoscope. As shown in fig. 7, the ring 31 may also be tear drop shaped. The shape of the ring 31 is not limited to this.
(Third embodiment)
The snare for an endoscope (hereinafter referred to as "snare for an endoscope 10B") of the third embodiment will be described below. Here, points different from the snare 10 for an endoscope will be mainly described, and repetitive description will not be repeated.
< Construction of snare for endoscope 10B >
The snare 10B for an endoscope includes a sheath 1, a cable 2, a loop wire 3, and a handle operation portion 4. In this regard, the configuration of the snare 10B for an endoscope is common to the configuration of the snare 10 for an endoscope.
Fig. 8 is a cross-sectional view of the snare wire 3 in the endoscope snare 10B as seen from a cross-section orthogonal to the extending direction of the snare wire 3. As shown in fig. 8, in the endoscope snare 10B, the snare wire 3 has a quadrangular shape when viewed from a cross section orthogonal to the extension direction of the snare wire 3. In this regard, the configuration of the snare for endoscope 10B is different from that of the snare for endoscope 10.
< Modification >
Fig. 9 is a cross-sectional view of the snare wire 3 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3 in the first modification of the snare 10B for an endoscope. As shown in fig. 9, the snare wire 3 may have a pentagonal shape when viewed from a cross section orthogonal to the extending direction of the snare wire 3. The pentagonal shape is a shape in which the corner 34 protrudes from one side of the quadrangular shape toward the inside of the ring 31.
Fig. 10 is a cross-sectional view of the snare wire 3 when viewed from a cross-section orthogonal to the extension direction of the snare wire 3 in the second modification of the snare 10B for an endoscope. As shown in fig. 10, the snare wire 3 may have a fan shape when viewed from a cross section orthogonal to the extending direction of the snare wire 3. The cross-sectional shape of the looper wire 3 is not limited to this.
(Fourth embodiment)
Hereinafter, a snare for an endoscope (hereinafter referred to as "snare for an endoscope 10C") according to a fourth embodiment will be described. Here, points different from the snare 10 for an endoscope will be mainly described, and repetitive description will not be repeated.
The snare 10C for an endoscope includes a sheath 1, a cable 2, a loop wire 3, and a handle operation portion 4. In this regard, the configuration of the snare for endoscope 10C is common to the configuration of the snare for endoscope 10.
Fig. 11 is a cross-sectional view of the snare wire 3 in the endoscope snare 10C as seen from a cross-section orthogonal to the extending direction of the snare wire 3. As shown in fig. 11, in the snare 10C for an endoscope, the diagonal portion 34 may be chamfered. In this regard, the configuration of the snare for endoscope 10C is different from that of the snare for endoscope 10.
(Fifth embodiment)
Hereinafter, a snare for an endoscope (hereinafter referred to as "snare 10D for an endoscope") according to a fifth embodiment will be described. Here, points different from the snare 10 for an endoscope will be mainly described, and repetitive description will not be repeated.
The snare 10D for an endoscope has a sheath 1, a cable 2, a loop wire 3, and a handle operation portion 4. In this regard, the configuration of the snare 10D for an endoscope is common to the configuration of the snare 10 for an endoscope.
Fig. 12A is a first cross-sectional view of the snare wire 3 in the endoscope snare 10D as seen from a cross-section orthogonal to the extending direction of the snare wire 3. Fig. 12B is a second cross-sectional view of the snare wire 3 in the endoscope snare 10D as seen from a cross-section orthogonal to the extending direction of the snare wire 3. The cross-sectional shape of the snare wire 3 in the first portion 31a is shown in fig. 12A, and the cross-sectional shape of the snare wire 3 in the second portion 31B is shown in fig. 12B.
As shown in fig. 12A and 12B, the cross-sectional shape of the snare wire 3 orthogonal to the extension direction has a corner 34 in the first portion 31a, and does not have a corner 34 (for example, has a circular shape) in the second portion 31B. That is, the corner 34 is formed continuously along the extending direction of the snare wire 3 throughout a part of the loop 31. In this regard, the configuration of the snare for endoscope 10D is different from that of the snare for endoscope 10.
While the embodiments of the present invention have been described above, various modifications may be made to the above-described embodiments. The scope of the present invention is not limited to the above-described embodiments. The scope of the present invention is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.
Industrial applicability
This embodiment is particularly advantageously applicable to endoscopic snares used in cold polypectomy.
The embodiments of the present invention have been described, but the embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.
Claims (10)
1. A snare for an endoscope is provided with:
A sheath;
a cable slidably inserted in the sheath in an extending direction of the sheath; and
The loop wire is arranged on the inner side of the sleeve,
One end and the other end of the loop wire in the extending direction are connected to one end of the cable in the extending direction in a loop-forming manner,
The snare wire has a first side, a second side connected to the first side, and a corner formed by the first side and the second side when viewed in a cross section orthogonal to an extending direction of the snare wire,
The corners face towards the inside of the ring,
The corners are chamfered.
2. An endoscopic snare according to claim 1, wherein,
The corner is continuously formed along the extending direction of the snare wire throughout a part or all of the loop.
3. An endoscopic snare according to claim 1, wherein,
The ring has a first portion and a second portion opposed to the first portion in a width direction of the ring,
The corner is formed in either one of the first portion and the second portion.
4. An endoscopic snare according to claim 1, wherein,
The angle formed by the first side and the second side is 30-90 degrees.
5. An endoscopic snare according to claim 1, wherein,
The snare wire has a triangular shape when viewed from a cross section orthogonal to an extending direction of the snare wire.
6. An endoscopic snare according to claim 5, wherein,
The length of one side of the triangle is more than 0.1mm and less than 0.4 mm.
7. An endoscopic snare according to claim 1, wherein,
The ring has a protrusion at a top end of the ring.
8. An endoscopic snare according to claim 1, wherein,
In the expanded state of the ring, the shape of the ring is any one of a circle, an ellipse, a tear drop, a diamond, and a hexagon.
9. An endoscopic snare according to claim 1, wherein,
The snare wire is a single strand wire.
10. An endoscopic snare according to any one of claims 1 to 9, wherein,
The snare wire is made of super-elastic alloy.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019148785A JP7288257B2 (en) | 2019-08-14 | 2019-08-14 | endoscopy snare |
| JP2019-148785 | 2019-08-14 |
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| CN112386308A CN112386308A (en) | 2021-02-23 |
| CN112386308B true CN112386308B (en) | 2024-06-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3684085B2 (en) * | 1998-09-02 | 2005-08-17 | ペンタックス株式会社 | Endoscopic wire loop treatment tool |
| JP4589511B2 (en) * | 2000-10-04 | 2010-12-01 | Ｈｏｙａ株式会社 | Endoscopic high frequency snare |
| WO2002083009A1 (en) * | 2001-04-12 | 2002-10-24 | Olympus Optical Co., Ltd. | Treatment tool for endoscope |
| JP2005198931A (en) * | 2004-01-19 | 2005-07-28 | Pentax Corp | Snare for endoscope |
| JP2011005046A (en) * | 2009-06-26 | 2011-01-13 | River Seiko:Kk | Treating instrument for endoscope |
| US20130018385A1 (en) * | 2011-07-11 | 2013-01-17 | Boston Scientific Scimed, Inc. | Polypectomy Snare Device |
| US10285725B2 (en) * | 2015-02-24 | 2019-05-14 | Boston Scientific Scimed, Inc. | Snare design for improved traction |
| JP2017136188A (en) * | 2016-02-03 | 2017-08-10 | 株式会社八光 | Snare for endoscope |
| JP2019509847A (en) * | 2016-03-31 | 2019-04-11 | カーディアック ペースメイカーズ， インコーポレイテッド | Extraction device configured to extract medical devices implanted in the long term |
| EP3565490B1 (en) * | 2017-01-09 | 2023-11-01 | United States Endoscopy Group, Inc. | Endoscopic snare device |
| JP6997985B2 (en) * | 2017-12-04 | 2022-01-18 | 株式会社八光 | Endoscopic snare |
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| CN112386308A (en) | 2021-02-23 |
| JP7288257B2 (en) | 2023-06-07 |
| JP2021029277A (en) | 2021-03-01 |
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