JP2004254823A - Endoscope with jacket sheath - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an endoscope with a jacket sheath capable of certainly engaging and disengaging a slip-off preventing mechanism for controlling the slip-off of the leading end part of a flexible insertion part from the interior of the leading end part of the jacket sheath without fear of causing the damage of a member. <P>SOLUTION: The channel tube 23 is set to a state twisted around the axial line of the channel tube 23 between both ends of the guide pipeline 17 in such a state that the jacket sheath 20 is covered with flexible insertion parts 11, 12 and 13 and the channel tube 23 is inserted into the guide pipeline 17 not only to bring the slip-off preventing mechanisms 18 and 28 to an engaged state by rotatory power making the channel tube 23 ready to return to the original state by its elasticity but also to release the engaged state of the slip-off preventing mechanisms 18 and 28 by adding rotatory power in the direction opposite to the direction of the rotatory power bringing both mechanisms 18 and 28 to the engaged state. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an endoscope with an outer sheath having an outer sheath for preventing a flexible insertion portion of the endoscope from being contaminated.
[0002]
[Prior art]
To prevent patient-to-patient infection through the endoscope during endoscopy, cover the flexible insertion portion of the endoscope with an outer sheath, and attach the outer sheath to the endoscope. It may be replaced every time.
[0003]
Then, in order to be able to use the treatment tools at the time of endoscopic examination, a channel tube for passing the treatment tools is provided in the outer sheath, and the guide conduit provided on the flexible insertion portion side is provided. It is configured such that a channel tube is passed therethrough.
[0004]
In such an endoscope with an outer sheath, during the endoscopic examination, the distal end portion of the outer sheath covered by the flexible insertion portion in which the observation window and the like are disposed is attached. You need to keep it from moving.
[0005]
Therefore, conventionally, a retaining mechanism including a claw mechanism for restricting the distal end portion of the flexible insertion portion from coming out of the distal end of the mantle sheath is provided, and after the endoscope inspection, the flexible sheath is flexibly moved from the mantle sheath. When the gender insertion portion is extracted, the distal end member of the cap-shaped outer sheath is crushed from the outside and elastically deformed in the radial direction to disengage the claw mechanism (for example, Patent Document 1). , Patent Document 2).
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. HEI 3-1930323 [Patent Document 2]
Japanese Utility Model Laid-Open No. 7-33001
[Problems to be solved by the invention]
However, when the engagement of the claw mechanism is disengaged, if the distal end member of the cap-shaped outer sheath is crushed from the outside and elastically deformed, the force may not be understood, and the engagement may not be properly disengaged. In some cases, too much force was applied and the distal end portion of the mantle sheath was damaged.
[0008]
Therefore, the present invention provides a detachment prevention mechanism for restricting the distal end portion of the flexible insertion portion from coming out of the distal end portion of the outer sheath with an outer sheath capable of engaging and disengaging reliably and without damaging the member. It is intended to provide an endoscope.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope with an outer sheath of the present invention has a channel tube inserted and arranged in an outer sheath detachably covered by a flexible insertion portion of the endoscope, and a distal end of the channel tube is provided. Is fixed to the distal end of the outer sheath, and a guide conduit through which the channel tube is passed in a state where the outer sheath is covered with the flexible insertion portion is provided in the flexible insertion portion. In an endoscope with an outer sheath provided with a detachable retaining mechanism for restricting a portion from coming out of the distal end portion of the outer sheath, the outer sheath is covered with a flexible insertion portion, and a channel tube is formed. With the channel tube inserted into the guide channel, the channel tube is set in a state of being twisted around the axis between both ends of the guide channel, and the channel tube is returned to its original shape by its own elasticity. Retaining mechanism by the rotating force of returning to become engaged, in which therewith to be able to release the engagement of the retaining mechanism by applying a rotational force in the opposite direction.
[0010]
In addition, the retaining mechanism is formed on the inner surface of the distal end portion of the mantle sheath such that the L-shaped groove portion is formed on the outer surface of the distal end portion of the flexible insertion portion, and the groove portion is detachably engaged with the groove portion. And a claw-shaped part.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
In FIG. 3, reference numeral 10 denotes an endoscope, reference numeral 20 denotes an outer sheath removably covered with the flexible insertion portions 11, 12, and 13 of the endoscope 10, and reference numeral 30 denotes a guide tube 17 ( A suction adapter 40 is detachably attached to the proximal connection tube 17b of the guide pipe), and reference numeral 40 is a suction tube.
[0012]
The flexible insertion portions 11, 12, and 13 of the endoscope 10 have a distal end body 13 in which a bending portion 12 that is bent by remote operation is connected to the distal end of an elongated flexible tube 11, and an observation window 14 and the like are arranged. It is configured to be connected to the tip of the bending portion 12.
[0013]
An operation section 15 connected to the base end of the flexible tube 11 is provided with a bending operation knob 16 for remotely bending the bending section 12 and the like. 12 bends as shown by the two-dot chain line.
[0014]
A guide tube 17 made of, for example, a flexible polyethylene resin tube or the like is inserted through the entire length of the flexible tube 11 and the curved portion 12 at a position deviated from the central axis. The proximal end of the guide tube 17 formed on the distal end body 13 communicates with a proximal connection tube 17 b that projects obliquely from the operation unit 15.
[0015]
An outer sheath 20 is provided with a covering tube 21 formed in a thin cylindrical shape with an elastic material such as a silicone rubber tube, for example, so as to removably cover the flexible tube 11 and the bending portion 12 of the endoscope 10. A distal end cap 22 formed of a transparent member and fitted to the distal end body 13 is watertightly attached to the distal end.
[0016]
The connecting ring 24 fixed to the base end of the coating tube 21 is detachable from the connecting portion between the operating portion 15 and the flexible tube 11, and the connecting portion is tightened by a manual sheath fixing screw 25. Can be fixed arbitrarily.
[0017]
In the coating tube 21, a channel tube 23 made of, for example, a flexible tetrafluoroethylene resin tube or a polyethylene resin tube is inserted and arranged over the entire length. The base end portion of the channel tube 23 is connected to and fixed to the distal end cap 22 so as to open to the outer surface, and extends rearward through the inside of the connecting ring 24.
[0018]
The channel tube 23 can be freely inserted into and removed from the guide tube 17 of the endoscope 10 over its entire length, and the base end portion of the channel tube 23 is inserted into the guide tube 17 from the distal end opening 17a side to extend from the base end connection tube 17b. Can be withdrawn.
[0019]
An elongated side hole 23a extending in the longitudinal direction of the channel tube 23 is formed in a portion near the base end of the channel tube 23 pulled out from the base end connection tube 17b, and the suction adapter 30 is connected to the base end connection tube 17b. When the channel tube 23 is passed through the tube, the side hole 23 a is positioned in the suction adapter 30.
[0020]
FIG. 4 is a cross-sectional view of the channel tube 23 taken along the line IV-IV shown in FIG. 3. The channel tube 23 of this embodiment includes a treatment instrument passage / suction path 23S, an air supply path 23A, and a water supply path 23W. Is a multi-lumen tube in which three holes are formed side by side, and the side hole 23a communicates with the treatment instrument passage and the suction passage 23S.
[0021]
FIG. 2 shows a usage state in which the outer sheath 20 is covered on the flexible insertion portions 11, 12, and 13 of the endoscope 10, and the suction adapter 30 is attached to the proximal connection tube 17b of the guide tube 17. Then, the mantle sheath fixing screw 25 arranged at the base end of the mantle sheath 20 is tightened, and the connecting ring 24 is fixed near the connecting part between the flexible tube 11 and the operation part 15.
[0022]
As a result, the flexible insertion portions 11, 12, and 13 of the endoscope 10 are insulated from the external environment by the mantle sheath 20, the covering tube 21 is elastically stretched in the axial direction, and the distal end cap 22 is moved to the distal end main body. 13 is in close contact with the distal end surface.
[0023]
Then, the suction tube 40 is connected to the suction adapter 30, and the base end of the channel tube 23 pulled out through the suction adapter 30 is connected to the air / water separation tube 51 in the connection device 50 arranged in the operation unit 15. Have been.
[0024]
The suction adapter 30 is provided with a manual channel fixing screw 38 for fixing the channel tube 23 to the suction adapter 30. A portion near the base end of the channel tube 23 passed through the guide tube 17 is It can be arbitrarily fixed to the suction adapter 30 with the channel fixing screw 38.
[0025]
Then, the channel tube 23 is set in a state of being twisted around the axis between the distal end cap 22 and the channel fixing screw 38 as shown by arrows A and B in FIG. It is fixed to the suction adapter 30.
[0026]
The twist angle of the channel tube 23 is, for example, about 90 ° to 180 °. As a result, a rotational force (rotational force in the direction opposite to the arrows A and B) for the channel tube 23 to return to its original state due to its own elasticity acts on the distal end cap 22 and the channel fixing screw 38.
[0027]
FIG. 5 shows the internal state of the suction adapter 30. The suction adapter 30 is formed with a channel tube passage hole 32 that penetrates straight from the inside of the connection tube 31 inserted and connected to the base end connection tube 17b. ing. Reference numeral 39 denotes a fixing nut which is manually screwed into the proximal connection tube 17b fixedly protruding from the operation unit 15.
[0028]
A treatment instrument insertion hole 33 is formed in a direction branching obliquely from an intermediate portion of the channel tube passage hole 32, and a suction mouthpiece 36 that branches off from the middle of the treatment instrument insertion hole 33 and protrudes outward. Is connected to a suction tube 40. The protruding end of the treatment instrument insertion hole 33 is a treatment instrument insertion port 34, and a rubber forceps stopper 35 having a sealing function is attached thereto.
[0029]
The side hole 23 a formed in the channel tube 23 passing through the channel tube passage hole 32 faces the opening of the treatment instrument insertion hole 33 in the channel tube passage hole 32, and the treatment instrument insertion is performed. It is formed large so as to protrude from the opening of the hole 33 in both front and rear directions.
[0030]
Further, a pair of rubber O-rings 37 for sealing a gap between the channel tube passage hole 32 and the channel tube 23 is disposed at a position before and after the side hole 23a. Does not ventilate inside the suction tube 40 and other parts of the channel tube 23 except the treatment instrument passage and suction passage 23S.
[0031]
The channel fixing screw 38 is screwed into a female screw portion formed at the outer end of the channel tube passage hole 32, and the channel tube 23 is passed through the channel tube passage hole 32 so that the channel fixing screw 38 is inserted. By tightening, the O-ring 37 arranged inside is crushed and the channel tube 23 is tightened from the outside.
[0032]
As a result, the channel tube 23 is fixed to the suction adapter 30, and if the channel tube 23 is loosened, the fixed state between the suction adapter 30 and the channel tube 23 is released.
[0033]
With such a configuration, when suction is performed from the suction tube 40, the suction force acts on the treatment tool passage / suction path 23S of the channel tube 23 from the treatment tool insertion hole 33 through the side hole 23a, and the treatment tool Intracorporeal contaminants and the like can be sucked through the passage and suction passage 23S.
[0034]
When the treatment tool 100 is inserted from the treatment tool insertion port 34, the treatment tool 100 is inserted into the treatment tool passage / suction path 23S from the treatment tool insertion hole 33 via the side hole 23a of the channel tube 23. In addition, collection of body tissue and other endoscopic procedures can be performed.
[0035]
FIG. 6 shows a distal end portion of the endoscope 10 in a state where the flexible insertion portions 11, 12, and 13 are covered with a sheath sheath 20, and FIG. 1 shows a distal end cap 22 with the distal end cap 22 removed. The state is shown with the covering tube 21 omitted.
[0036]
As shown in FIG. 6, when the sheaths 20 are covered with the flexible insertion portions 11, 12, and 13, the inner surface of the distal end of the distal end cap 22 is in close contact with the outer surface of the distal end of the distal end body 13, and the outer sheath 20 is closed. Channel tube 23 is passed through the guide tube 17 of the endoscope 10.
[0037]
A channel deformation space 19 is formed in the portion of the distal end portion body 13 through which the channel tube 23 passes, as shown in FIG. 7 showing a VII-VII cross section. It can elastically deform within 19.
[0038]
Further, as shown in FIG. 1, the tip cap 22 and the tip body 13 are provided with a claw 28 and a groove 18 for restricting the tip body 13 from coming out from the inside of the tip cap 22. A retaining mechanism is provided.
[0039]
In this embodiment, the claw portions 28 are formed in four L-shaped projections on the inner peripheral surface of the tip cap 22, and the groove portions 18 are formed so that the claw portions 28 can be disengaged. 13 are formed in four L-shaped recesses on the outer peripheral surface.
[0040]
FIG. 8 shows an engagement state between the claw portion 28 and the groove portion 18. The claw portion 28 a of the claw portion 28 engages with the stepped portion 18 a of the groove portion 18, whereby the tip cap 22 is moved. And the tip main body 13 are in a state in which they cannot be relatively moved in the axial direction.
[0041]
And, since the channel tube 23 is set by being twisted around the axis, the rotational force in the direction opposite to the torsion direction (the “anti-A direction” shown in FIG. 8) moves the tip cap 22 around the axis. And the claw portion 28a of the tip cap 22 is brought into a retaining state in which the claw portion 28a is engaged with the step portion 18a of the tip portion main body 13, and this state is maintained.
[0042]
In order to release such a retaining state, since the groove portion 18 is formed wider in the circumferential direction than the claw portion 28, the tip cap 22 is rotated around the tip body 13 in the A direction. The rotation can be more easily performed by loosening the channel fixing screw 38 and then performing the operation.
[0043]
By rotating the tip cap 22 in this manner, the claw portion 28a comes off the stepped portion 18a as shown in FIG. The cap 22 is released from the inside of the cap 22 so that it can be pulled out rearward.
[0044]
When covering the outer sheath 20 with the flexible insertion portions 11, 12, and 13, since the corners of the distal ends of the claw-like portions 28 are formed in a sloped shape, the claw-like portions 28 are formed into groove-like portions. 18 is smoothly introduced.
[0045]
The present invention is not limited to the above-described embodiment. For example, the guide tube 17 is not inserted through the flexible insertion portions 11, 12, and 13, and the guide tubes 17 are not inserted into the flexible insertion portions 11, 12, and 13. The present invention can be applied to a device or the like formed in a groove shape depressed from the outer surface similarly to the above-described embodiment.
[0046]
【The invention's effect】
According to the present invention, the distal end portion of the flexible insertion portion is moved from within the distal end portion of the mantle sheath by the rotational force of the channel tube set by twisting around the axis to return to the original state by its own elasticity. The retaining mechanism for restricting the escape of the channel tube is engaged, and the engagement of the retaining mechanism can be released only by rotating the distal end portion of the outer sheath to which the distal end of the channel tube is fixed in the opposite direction. Thus, the retaining mechanism can be reliably disengaged without fear of damaging the member.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state in which a sheath is removed from a flexible insertion portion of an endoscope with a sheath according to an embodiment of the present invention, with a part thereof being omitted.
FIG. 2 is a side view of the endoscope with an outer sheath according to the embodiment of the present invention.
FIG. 3 is a partial cross-sectional side view of the endoscope with a mantle sheath according to the embodiment of the present invention in a use preparation state.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 of the embodiment of the present invention.
FIG. 5 is a side cross-sectional view of a suction adapter portion of the endoscope with a sheath according to the embodiment of the present invention.
FIG. 6 is a side cross-sectional view of a distal end portion of the endoscope with an outer sheath in a state where the outer sheath is covered with the outer sheath according to the embodiment of the present invention.
FIG. 7 is a sectional view taken along line VII-VII in FIG. 6 of the embodiment of the present invention.
FIG. 8 is a side sectional view showing an engagement state of the retaining mechanism according to the embodiment of the present invention.
FIG. 9 is a side cross-sectional view of the engagement prevention state of the retaining mechanism according to the embodiment of the present invention.
[Explanation of symbols]
10 Endoscope 11 Flexible tube (flexible insertion part)
12 Bending part (flexible insertion part)
13 Tip body (tip of flexible insertion part)
17 Guide tube (guide pipe)
18 Groove (retaining mechanism)
18a Stepped portion 19 Channel deformable space 20 Outer sheath 21 Coated tube 22 Tip cap 23 Channel tube 28 Claw-shaped portion (retaining mechanism)
28a Claw part 30 Suction adapter 32 Channel tube passage hole 38 Channel fixing screw

Claims (2)

A channel tube is inserted and arranged in an outer sheath detachably covered by a flexible insertion portion of the endoscope, and a distal end of the channel tube is fixed to a distal end of the outer sheath, and the outer sheath is flexible. A guide conduit through which the channel tube is passed in a state covered by the insertion portion is provided in the flexible insertion portion, and a distal end portion of the flexible insertion portion comes out of a distal end portion of the outer sheath. In an endoscope with a mantle sheath provided with a detachable retaining mechanism for regulating
In a state where the outer sheath is covered with the flexible insertion portion and the channel tube is inserted into the guide channel, the channel tube is twisted around an axis between both ends of the guide channel. And the rotational force of the channel tube trying to return to its original state due to its own elasticity causes the retaining mechanism to be engaged, and by applying a rotational force in a direction opposite to that, the engagement of the retaining mechanism is prevented. An endoscope with an outer sheath, wherein the end state can be released. The retaining mechanism is formed on an inner surface of the distal end portion of the outer sheath so that the L-shaped groove portion is formed on the outer surface of the distal end portion of the flexible insertion portion, and the outer sheath is detachably engaged with the groove portion. The endoscope with an outer sheath according to claim 1, further comprising a claw-shaped portion.

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