Source: http://www.google.com/patents/US6689051?dq=4052565
Timestamp: 2014-07-22 15:40:22
Document Index: 82243459

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Patent US6689051 - Endoscope hood for mucous membrane resection - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA hood for an endoscope has a cap part detachably mounted on the end portion of the insertion part of an endoscope. An opening communicates with the inside of the cap part, at the end of a flexible tube connected to the opening. Into the flexible tube, such an endoscopic treating instrument as a high...http://www.google.com/patents/US6689051?utm_source=gb-gplus-sharePatent US6689051 - Endoscope hood for mucous membrane resectionAdvanced Patent SearchPublication numberUS6689051 B2Publication typeGrantApplication numberUS 09/861,684Publication dateFeb 10, 2004Filing dateMay 21, 2001Priority dateMay 26, 2000Fee statusPaidAlso published asDE10126062A1, DE10126062B4, US20010053909Publication number09861684, 861684, US 6689051 B2, US 6689051B2, US-B2-6689051, US6689051 B2, US6689051B2InventorsMamoru Nakada, Chika ShiroOriginal AssigneeOlympus CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (6), Referenced by (9), Classifications (24), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetEndoscope hood for mucous membrane resectionUS 6689051 B2Abstract A hood for an endoscope has a cap part detachably mounted on the end portion of the insertion part of an endoscope. An opening communicates with the inside of the cap part, at the end of a flexible tube connected to the opening. Into the flexible tube, such an endoscopic treating instrument as a high frequency snare is inserted.
What is claimed is: 1. A hood for an endoscope comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; and a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part through the opening, and a proximal end through which an endoscopic treating instrument can be removably inserted into the flexible tube without connecting a tube arranged inside the endoscope thereto; wherein said flexible tube is adapted to be arranged outside the endoscope when said hood is attached at the distal end of the endoscope; wherein the cap part includes a side wall and a connecting wall which connects between the side wall and the fixing part, and outwardly extends from the fixing part; and wherein the opening is formed on the connecting wall. 2. The hood according to claim 1, wherein said cap part and said fixing part are substantially cylindrical to be fitted on the distal end of said endoscope which is also substantially cylindrical.
3. The hood according to claim 2, wherein the outer diameter of said cap part is greater than the outer diameter of said fixing part.
4. The hood according to claim 3, further comprising a flange-shaped connecting portion which connects a proximal end of said cap part and a distal end of said fixing part.
5. The hood according to claim 1, wherein said cap part is made from a flexible resin.
6. The hood according to claim 1, wherein a protrusion projecting inward toward the cavity is formed on the inner surface of said cap part.
7. The hood according to claim 6, wherein said protrusion is located near a rim of said cap part.
8. The hood according to claim 6, wherein said protrusion protrudes inward as a flange.
9. The hood according to claim 6, wherein a snare wire of a high frequency snare is pushed against and located on a proximal surface of said protrusion.
10. The hood according to claim 9, wherein said high frequency snare is set against the proximal surface of said protrusion before said endoscope is inserted into the body.
11. The hood according to claim 1, wherein an abutment protruding inward is provided on an inner surface of a boundary between said cap part and said fixing part.
12. The hood according to claim 11, wherein said abutment protrudes inward as a flange.
13. The hood according to claim 1, wherein a rim of said cap part is in a plane which is oblique to an insertion direction of the endoscope.
14. The hood according to claim 13, wherein said flexible tube communicates with said cap part at a position where an axial length of the cap part is shortest.
15. The hood according to claim 1, wherein a rim of said cap part is in a plane which is perpendicular to an insertion direction of the endoscope.
16. The hood according to claim 1, wherein said flexible tube has a valve for preventing fluid from flowing from the proximal side to the distal side.
17. The hood according to claim 16, wherein said valve is provided at the proximal end of said flexible tube.
18. A hood for an endoscope comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; and a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part; wherein said flexible tube is adapted to be arranged outside an endoscope when said hood is attached at the distal end of the endoscope; wherein the cap part includes a side wall and a connecting wall which connects between the side wall and the fixing part, and outwardly extends from the fixing part; and wherein the opening is formed on the connecting wall. 19. An endoscopic hood system comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part through said opening, and a proximal end; and an endoscopic treating instrument being removably inserted into said flexible tube through said proximal end without connecting a tube arranged inside the endoscope thereto; wherein said flexible tube is adapted to be arranged outside an endoscope when said hood is attached at the distal end of the endoscope; wherein the cap part includes a side wall and a connecting wall which connects between the side wall and the fixing part and outwardly extends from the fixing part; and wherein the opening is formed on the connecting wall. 20. An endoscopic hood system according to claim 19, wherein said endoscopic treating instrument is a high frequency snare.
21. An endoscopic hood system according to claim 19, wherein said endoscopic treating instrument is an injection needle.
22. A hood for an endoscope comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; and a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part through the opening, and a proximal end through which an endoscopic treating instrument can be removably inserted into the flexible tube without connecting a tube arranged inside the endoscope thereto; wherein said flexible tube is adapted to be arranged outside the endoscope when said hood is attached at the distal end of the endoscope, said cap part and said fixing part are substantially cylindrical to be fitted on the distal end of said endoscope which is also substantially cylindrical, wherein the outer diameter of said cap part is greater than the outer diameter of said fixing part, and the center of said cap part is eccentric to that of said fixing part. 23. A hood for an endoscope comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part through the opening, and a proximal end through which an endoscopic treating instrument can be removably inserted into the flexible tube without connecting a tube arranged inside the endoscope thereto; and a flange-shaped connecting portion which connects a proximal end of said cap part and a distal end of said fixing part; wherein said flexible tube is adapted to be arranged outside the endoscope when said hood is attached at the distal end of the endoscope, said cap part and said fixing part are substantially cylindrical to be fitted on the distal end of said endoscope which is also substantially cylindrical, wherein the outer diameter of said cap part is greater than the outer diameter of said fixing part, and said connecting portion is tapered. 24. A hood for an endoscope comprising:
a cap part defining a cavity and having an opening; a fixing part for fixing said cap part to a distal end of an endoscope; a flexible tube having a distal end which is fixed to said cap part and communicating with the cavity of said cap part through the opening, and a proximal end through which an endoscopic treating instrument can be removably inserted into the flexible tube without connecting a tube arranged inside the endoscope thereto; and a flange-shaped connecting portion which connects a proximal end of said cap part and a distal end of said fixing part; wherein said flexible tube is adapted to be arranged outside the endoscope when said hood is attached at the distal end of the endoscope, said cap part and said fixing part are substantially cylindrical to be fitted on the distal end of said endoscope which is also substantially cylindrical, wherein the outer diameter of said cap part is greater than the outer diameter of said fixing part, and the distal end of said flexible tube is connected to said connecting portion.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is based upon and claims the benefit of priority from Japanese Patent Applications No. 2000-156804 filed on May 26, 2000 and No. 2001-18993 filed on Jan. 26, 2001 in Japan, the entire contents of which are incorporated by reference.
SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a hood for an endoscope with which endoscopic mucosal resection is safely and easily operated using a high frequency snare.
FIG. 1 is a section view showing a hood for an endoscope according to the first embodiment of the invention.
FIG. 2 is a perspective view showing the hood for an endoscope according to the first embodiment of the invention.
FIG. 3 is a section view showing a mucous membrane sucked by a cap part of the hood for an endoscope according to the first embodiment of the invention.
FIG. 4 is a section view showing that a snare wire is about to loop around the mucous membrane in the hood for an endoscope according to the first embodiment of the invention.
FIG. 5 is a section view showing that the snare wire loops around the mucous membrane in the hood for an endoscope according to the first embodiment of the invention.
FIG. 6 is a section view showing that the snare wire tightly binds the mucous membrane in the hood for an endoscope and that the state of the mucous membrane and muscular coats is confirmed with an ultrasonic probe.
FIG. 7 is a section view showing a hood for an endoscope according to the second embodiment of the invention.
FIG. 8 is a perspective view of the hood for an endoscope according to the second embodiment of the invention.
FIG. 9 is a section view showing a hood for an endoscope according to the third embodiment of the invention.
FIG. 10 is a section view showing a hood for an endoscope according to a modification of the first embodiment.
DETAILED DESCRIPTION The embodiments of the invention will be described with reference to the accompanying drawings.
FIGS. 1 and 2 show a hood 1 for an endoscope according to a first embodiment of the invention. The hood 1 for an endoscope comprises a cap part 2 defining a cavity 1 a which in a preferred implementation is approximately cylindrical and transparent. The hood 1 further comprises an endoscope mounting part 5 (alternatively referred to herein as a �fixing part�) which is approximately cylindrical and detachably fix to the hood 1 on the end portion of an insertion part 4 of an endoscope 3. The cap part 2 is approximately cylindrical with the outer diameter 18 mm, the inner diameter 16 mm and the length 14 mm. The endoscope mounting part 5 is approximately cylindrical with the outer diameter 13 mm, the inner diameter 12 mm and the length 10 mm.
Also on the end portion of the cap part 2, a flange 7 protrudes towards the center of the hood 1. The length of the flange is preferably 0.8 mm. As shown in FIG. 4, a snare wire 16 b is disposed in the cavity 1 a from a sheath 16 a of a high frequency snare 16. The snare wire 16 b engages with the flange 7 which contains the snare wire 16 b in the cavity 1 a. An opening 8 communicating with the cavity 1 a of the cap part 2 is formed in a flange between the proximal end of the cap part 2 and the distal end of the endoscope mounting part 5. Outside the endoscope mounting part 5 is arranged a flexible tube 9 into which a treating instrument such as the high frequency snare 16 can be inserted. The end portion of the flexible tube 9 is connected to the opening 8. The end portion of the flexible tube 9 is fixed to the endoscope mounting part 5 and the cap part 2 in an airtight state by means of bonding, welding or the like. The end of the flexible tube 9 opens into the cavity 1 a of the cap part 2.
Further suction can then be applied to the cavity 1 a while the snare wire 16 b placed over the bottom of the resected part H2 to allow the resected part H2 to continue to swell into the cavity 1 a of the cap part 2, and substantially fill the cavity 1 a. As shown in FIG. 6, the snare wire 16 b is then drawn into the sheath 16 a to tightly bind the bottom of the resected part H2 of the mucous membrane H1. An ultrasonic probe 17 inserted into the channel 15 can then be used to observe the mucous membrane H1 and the muscular coats H3 to check whether the muscular coats H3 are snared by the snare wire 16 b. Those skilled in the art will appreciate that the endoscope hood 1 of the present invention makes the resection of the mucous membrane H1 safe. The resection of the mucous membrane H1 with the muscular coats H3 snared by the snare wire 16 b may cause perforating and bleeding.
The airtight valve 10 provided at the proximal end of the flexible tube 9 prevents air from leaking on suction. Therefore, the resected part H2 of the mucous membrane H1 can be assured of being sucked and drawn into the cavity 1 a. The cap part 2 and the flexible tube 9 that are formed of elastic materials can be deformed corresponding to the shape of the body cavity and pass through the body cavity. This lessens patient's pain, even when the outer diameter of cap part 2 is large.
FIGS. 7 and 8 illustrate a hood 20 for an endoscope according to the second embodiment. The hood 20 has a cap part 21 defining a cavity 20 a. Preferably, the cap part 21 is approximately cylindrical and transparent. The hood 20 further comprises a substantially cylindrical endoscope mounting part 22 to detachably fix the hood 20 to the end portion of the insertion part 4 of the endoscope 3, as is the hood 1 in the first embodiment. As shown in FIG. 7, the cap part 21 and the endoscope mounting part 22 are cylindrical with different outer diameters and inner diameters. A tapered flange 23 connects the outer diameters. The outer and inner diameters and thickness and materials of the cap part 21 and the endoscope mounting part 22 and the flange 23 are set the same as in the hood according to the first embodiment.
FIG. 9 shows a hood 30 for an endoscope according to the third embodiment. The hood 30 has a cap part 31 defining a cavity 30 a. Preferably the cap part 31 is approximately cylindrical and transparent. The hood 30 further comprises a substantially cylindrical endoscope mounting part 32 to detachably fix the hood 30 to the end portion of the insertion part 4 of the endoscope 3, as the hoods in the first and second embodiments are fixed. As shown in FIG. 9, the cap part 31 and the endoscope mounting part 32 are cylindrical with different outer diameters and inner diameters. The center of the cap part 31 is eccentric to that of the endoscope mounting part 32. Outer and inner diameters and thickness and materials of the cap part 31 and the endoscope mounting part 32 are set the same as those of the hoods 1 and 20 according to the first and second embodiments.
The operation handle 40 includes a handle body 41 having a finger hang portion, and a slider 42 that is axially slidable with respect to the handle body 41. When the slider 42 is slid on the handle 41 axially, the snare wire 16 b of the high frequency snare 16 axially slides with respect to the sheath 16 a to control the opening of the snare wire 16 b. In the modification, a control member 43 is provided to control sliding of the slider 42, so that the snare wire 16 b will not retract until the product is shipped and used by an operator. The control member 43 is detachably attached to the handle body 41 and removed from the handle body 41 just before the operation of the high frequency snare 16. This prevents the slider 42 from moving inadvertently.
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